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  • MDPI - Multidisciplinary Digital Publishing Institute  (37)
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  • 1
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-07-06
    Description: The articles in this Special Issue cover a very wide range of topics related to the cultivation, management and use of fast-growing tree species. In addition to research on breeding and on the influence of pruning practices on the height growth of paulownia, three articles deal with the influence of site characteristics and nutrient availability on the physiology and yield security of fast-growing tree species. Another article focuses on the modeling of soil carbon in Salix plantations, while the article by Boruszewski et al. reports on potentially suitable areas for the planting of fast-growing tree species in Poland. Zitzmann and Rode examine the impact of short-rotation plantation management on phytodiversity, while Helbig et al. deal with the influence of leaf feeding on the growth of poplars and willows. Finally, Hernandez-Estrada et al. describe the dry matter loss of poplar wood chips during storage.
    Keywords: woody biomass crops ; bioenergy ; biodiversity ; species richness ; flora ; vascular plants ; short rotation coppices ; poplars ; willows ; feeding simulation ; defoliation ; herbivory ; short rotation coppice ; phosphatase activity ; nutrient content ; growth stages ; biomass ; willow ; Salix ; capacity ; European larch ; fast-growing trees ; plantations ; plantation area ; poplar cultivar “Hybrid 275” ; sown area ; biomass production ; life cycle assessment ; climate impact ; soil organic carbon ; genotypic difference ; CRISPR/Cas9 ; genome editing ; Populus ; INRA 717-1B4 ; pyramidal plant habitus ; leaf petiole angle ; branch angle ; nitrogen ; phosphorus ; carbon ; physiology ; F. mandshurica ; Robinia pseudoacacia L. ; photosynthetic vitality ; chlorophyll and phenol content ; nutrition supply ; dry matter yield ; land reclamation ; spring pruning ; year-long pruning ; branching ; angle diversion of sprout ; dry matter losses ; poplar wood chips ; laboratory scale ; cultivable saproxylic microbiota ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::K Economics, finance, business & management::KN Industry & industrial studies::KNA Primary industries::KNAL Forestry & related industries
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  • 2
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-23
    Description: This book is a compilation of 10 recently published academic articles addressing sustainable residential landscape design and planning across geographies, scales, and perspectives: from American rain garden design to South Korean urban forestry; from Mexican community open space design to Australian neighborhood park planning; and from Chinese urban design to Bolivian land-use change. This volume brings together authors from a growing community of landscape sustainability scholars of landscape architecture and architecture; planning and construction; ecology and horticulture; agricultural and environmental sciences; and health, exercise, and nutrition. In summary, these papers address facets of a fundamental challenge for the 21st century: the design and planning of sustainable and resilient human settlements.
    Keywords: NA1-9428 ; NX1-820 ; carbon reduction ; intergenerational engagement ; tree planting structure ; urban tree ; All-Area Integrated Development ; residential landscapes ; small towns ; rural landscape architecture ; urban commons ; demolition/relocation-oriented market model (D/RMM) ; parks ; youth at risk ; spatial theory ; wellbeing ; building energy saving ; Guatemala ; land use change ; new rural construction model (NRCM) ; substrate ; phosphorus ; green infrastructure ; Origin Farmer Indigenous Territory ; dwellings ; residential sustainability ; residential neighborhood parks ; sustainable livelihoods ; sustainability ; ecological priority ; CPTED ; ecological service ; circular economy ; action research ; urban villages transformation ; cohousing ; public space recovery ; Bolivian Amazon ; design model ; social sustainability ; community service learning ; rural revitalization ; China ; coordinated development of rural communities & ; shared resources ; rain gardens ; tactical urbanism ; climate sensitive design ; prevention of gender-based violence ; polyculture ; comfort ; Indigenous versus non-indigenous land-use ; bioretention ; monoculture ; landscape performance evaluation ; low impact development ; governance ; territory ; thema EDItEUR::A The Arts::AM Architecture
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  • 3
    Publication Date: 2024-04-05
    Description: Planting trees in the agricultural landscape, in the form of establishing agroforestry systems, has a significant role to play in potentially improving ecosystem services, such as increased biodiversity, reduced soil erosion, increased soil carbon storage, improved food security and nutrition, and reduced greenhouse gas emissions. While the role of trees in agroforestry systems in improving ecosystem services has been researched, studies in new systems/regions and new agroforestry system designs are still emerging. This Special Issue includes selected papers presented at the 4th World Congress on Agroforestry, Montpellier, France 20–22 May 2019, and other volunteer papers. The scope of articles includes all aspects of agroforestry systems.
    Keywords: QH301-705.5 ; Q1-390 ; S1-972 ; farmers’ knowledge ; ahannon-wiener index ; economic benefits ; alley cropping ; lignin ; shelterbelts ; agroforestry ; natural capital ; forest farming ; nutrient content ; agroforestry system ; review ; Amazonia ; cropland ; riparian buffers ; climate change ; subtropical acidic forest soil ; bees ; phosphorus ; pollination ; 15N tracing experiment ; stable isotope ; West Java ; interspecific competition ; growth form ; cropping system ; climate change mitigation ; gross N transformation rates ; East Africa ; improved-fallow ; N-fixing trees ; carbon sequestration ; home garden ; margalef index ; windbreaks ; leaf nutrient diagnosis ; agroforestry systems ; pollinators ; sorption ; forestland ; China ; temperature change ; fractionation ; hedgerows ; native trees ; slash-and-mulch ; soil N ; shade tree species ; soil C ; Alpinia oxyphylla ; sustainable management ; plant water use ; rubber-based agroforestry system ; ecosystem services ; Indonesia ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences
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  • 4
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: Physical processes are keys for the status of a lake. In this Special Issue, the emphasis is on dissolved oxygen and on exchange of gases, energy and momentum between atmosphere and further mixing and consumption within the water. The studies presented relate to ice-free as well as ice-covered lakes. Field measurements are combined with theoretical approaches.
    Keywords: hydrodynamic model ; bubble plume ; artificial mixing ; GLM ; Si3D ; dissolved gas ; Henry law ; total gas pressure ; ebullition ; greenhouse gases ; lacustrine waters ; diurnal variation ; hourly model ; water temperature ; dissolved oxygen ; shallow lakes ; and sediment heat flux ; water quality ; chlorophyll-a ; phosphorus ; phosphorus release ; full set of turbulent stresses ; Acoustic Doppler current profilers ; interbeam velocity correlations ; ice-covered lakes ; convectively-mixed layer ; anisotropic turbulence ; shallow lake ; ice-covered period ; ice phenology ; snow-ice cover thickness ; under-ice irradiance ; radiatively driven convection ; climate change ; 3D modelling ; stratification ; bubble plumes ; fractal ; lakes ; mixing ; multi-scale ; turbulence ; energy fluxes ; energy content ; reservoirs ; internal waves ; surface waves ; biogenic turbulence ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology
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  • 5
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-12-20
    Description: One last comment concerns the fundamental contributions of Fourier analysis to quantum physics: Quantum mechanics and quantum field theory.
    Keywords: Q1-390 ; self-electrorefining ; hedyphane group ; structural combinatorics ; CuFe2O4 ; Kamchatka ; Raman ; El Dragón ; apatite supergroup ; borate ; ariegilatite ; oyonite ; Tuscany ; gahnite ; magnesioferrite ; Szklary pegmatite ; aurihydrargyrumite ; Au6Hg5 phase ; Trentino ; Peru ; Germany ; cerromojonite ; sulfosalt ; pyrometamorphism ; Bellerberg volcano ; manganese ; gold ; spinel supergroup ; selenium ; CuAl2O4 ; clinokurchatovite ; sharyginite ; Poland ; copper ; kurchatovite ; copper oxide ; antimony ; nabimusaite group ; laachite ; lead ; thermaerogenite ; intercalated hexagonal antiperovskite ; placer ; Lower Silesia ; Eldfell ; Tolbachik volcano ; structural complexity ; nöggerathite-(Ce) ; Val di Fiemme ; Oyon district ; sanidinite ; cuprospinel ; sulfate ; fumarole sublimate ; Cretaio ; polymorphism ; polytypism ; tiberiobardiite ; fiemmeite ; stacking faults ; CO3-group ; Hatrurim Complex ; least-action principle ; phosphorus ; Laacher See ; new oxalate mineral ; Japan ; verneite ; alkaline volcanic rock ; arsenic ; Raman spectroscopy ; single-crystal investigation ; Rusinovite ; Eifel ; Lima department ; Italy ; barioferrite ; configurational entropy ; Hekla ; mercury ; Bolivia ; parafiniukite ; aluminofluoride ; new mineral ; Shadil-Khokh volcano ; Vesuvius ; bournonite group ; Ehime ; calcium ; lillianite homologous series ; chalcophyllite group ; sou?ekite ; silicate ; pyrometamorphic rocks ; crystal structure ; zirconolite ; bismuth ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general
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  • 6
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-02-01
    Description: This special issue entitled “Water Quality Assessments for Urban Water Environment,” strives to highlights the status quo of water environment, opportunities and challenges for their sustainable management in lieu of rapid global changes (land us eland cover changes, climate change, population growth, change in socio-economic dimension, urbanization etc.), in the urban space particularly in developing nations around the world. It also highlights the effect of COVID19 pandemic on water resources and way forward to minimize the risk of spreading health risk associated with wastewater management. Considering the complex nature of the urban water security, it highlights the importance of emerging approaches like socio-hydrology, landscape ecology, regional-circular-ecological sphere etc., which presents a perfect combination of hard (infrastructure) and soft (numerical simulations, spatial technologies, participatory approaches, indigenous knowledge) measures, as the potential solutions to manage this precious water resource in coming future. Finally, what is the way forward to enhance science-policy interface in a better way to achieve global goals e.g., SDGs at local level in a timely manner. It provides valuable information about sustainable water resource management at the urban landscape, which is very much useful for policy-makers, decision-makers, local communities, and other relevant stakeholders.
    Keywords: groundwater ; geospatial analysis ; hydrogeochemical assessment ; multivariate statistical analysis ; water quality index ; middle and lower reaches of the Yangtze River ; urban river stretches ; phosphorus ; spatial distribution ; bioavailability ; suspended sediment (SS) ; water quality ; WEAP ; climate change adaptation ; urbanization ; domestic wastewater management ; sustainable development goals ; triple-rice cropping system ; full-dike ; surface water quality ; WAWQI ; An Giang Province ; the Vietnamese Mekong Delta ; hydrological residence time (HRT) ; lake ; COVID ; waterbodies ; WQI ; HPI ; HEI ; SARS-CoV-2 ; COVID-19 ; bioaerosol ; aerosolized wastewater ; environmental transmission ; agriculture ; water security ; water scarcity ; climate change ; IWRM ; socioeconomic changes ; sustainable development ; Pindrawan tank area ; drinking water quality ; artificial intelligence ; particle swarm optimization ; support vector machine ; naive Bayes classifier ; water insecurity ; water security framework ; public health ; primary health care ; groundwater demand ; Sundarbans ; vulnerability ; sensitivity loop ; water–human wellbeing nexus ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCN Environmental economics
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  • 7
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: This Special Issue is designed to celebrate the founding of the open-access journal Oceans and is focused on presenting new ideas and advances at the cutting edge of ocean science. The scope of this Special Issue includes, but is not limited to: ocean geosciences, physics, biogeochemistry, and ecology; ocean ecosystem services and sustainable ocean resource use; and ocean operations and engineering. The fifteen articles published in this Special Issue focus on diverse areas of oceanography, including ocean ecology and biology, ocean geosciences, ocean climate and meteorology, ocean circulation, ocean chemistry and biogeochemistry, ocean resources (e.g., fisheries, aquaculture, and mining), ocean engineering, ocean modeling and ocean governance.
    Keywords: SIDS ; UN Member States ; sustainable development goal 14 ; SAMOA pathway ; capacity building ; scientific infrastructure ; IAEA ; ocean challenges ; nuclear and isotopic techniques ; ecology ; oceanography ; Portugal ; abundance rate ; nursery ; common dolphin ; Delphinus delphis ; phytoplankton ; zooplankton ; time series ; regime shift ; climate ; nutrients ; composite ; delamination ; seawater ; immersion ; ageing ; Black Sea ; biogeochemical modelling ; seasonal phytoplankton and inter-annual variation ; capture–recapture ; Cayman Islands ; Seychelles ; monitoring ; endangered species ; maximum number of individuals ; photo-identification ; mark-recapture ; movement ecology ; phosphorus ; polyphosphates ; pyrophosphate ; pyrophosphatase activity ; seaweed ; Ulva ; ras al hadd oceanic dipole ; arabian sea ; cyclonic and anticyclonic eddies ; altimetric data ; angular momentum eddy detection and tracking algorithm (AMEDA) ; HYCOM model ; ARGO floats ; carbon cycle ; tropical Atlantic ; dissolved inorganic carbon ; alkalinity ; Demerara Rise ; millennial-scale variability ; Late Quaternary paleoclimate ; seafloor mapping ; vulnerable deep-sea habitats ; deep-sea corals ; chemosynthesis-based communities ; vulnerable marine ecosystem ; Atlantic Ocean ; seismic faults ; slope instabilities ; submarine volcanism ; fluid-flow processes ; bottom currents ; tsunamis ; canyon heads ; tectonic indentation ; multidisciplinary approach ; carbon ; eutrophic ; Hiroshima Bay ; nitrogen ; sulfur ; sediment ; ocean forecasting ; reflexivity ; fisheries ; harmful algal blooms ; coupled natural-human systems ; Anthropocene ocean ; shark ; luminescence ; Etmopteridae ; Dalatiidae ; Somniosidae ; photophore ; hormonal control ; counter-illumination ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
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  • 8
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: Mixed cropping, also known as inter-cropping or co-cultivation, is a plant production system that involves planting two or more species (or cultivars) in the same field in a variable order—row or rowless—simultaneously. Mixed cropping plays an important role in sustainable agriculture by adding value to crop rotations and agroecosystems. Scientific investigations on environmentally friendly mixed cropping should be supported by studies on the direct costs and long-term benefits that are the most relevant to farmers. Meeting the need to strengthen the scientific basis for mixed crops, the papers in this Special Issue enhance our understanding of the following: The selection of species and cultivars for a mixed crop system as well as the choice of agricultural treatments that will secure a stable yield of mixtures; Inter- and intra- species competition of plants in a canopy; Ecological intensification approaches and opportunities for maximizing crop performance and yield in mixtures; The effects of mixed crops on crop rotations; The short- and long-term ecosystem benefits of mixtures; The effects on pests and the biodiversity of agroecosystems provided by mixtures; The economic aspects of adopting the mixtures in farms; The nutritive value of mixtures for livestock; Other topics related to the mixed cropping.
    Keywords: barley ; oats ; triticale ; yield ; leaf area index ; land equivalent ratio ; standard gross margin ; brachiaria ; cereal-livestock production ; perception ; push-pull technology ; smallholder farmers ; proximity effect ; border effect ; neighbor effect ; strip intercropping ; legume ; cereals ; Hordeum vulgare ; Lolium multiflorum ; phosphorus ; water stress ; competition indices ; plant development stages ; spring cereal mixtures ; grain yield ; protein yield ; metabolic energy yield ; differentiations of cereal mixture ; sustainable agriculture ; maize ; Zea mays L. ; biodiversity ; intercropping ; silage ; growth ; quality ; non-legume ; mixed crop ; herbivores ; pest population ; natural enemy ; cereal–legume mixture ; common vetch ; cultivar ; soil quality ; cereal-legume mixture ; organic farming ; conventional farming ; leaf greenness index ; seed yield ; yield components ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
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  • 9
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-09
    Description: This Special Issue reprint highlights seventy years since the discovery of carbon nanotubes (CNTs) in 1952 by Russian scientists LV Radushkevich and VM Lukyanovich in what was then the Union of Soviet Socialist Republics or the USSR. It also reflects the popularization by the well-known Japanese scientist S Iijima, since 1991, of carbon nanostructures, including CNTs, towards nanotechnology as a forever impactful and inspiring field. For researchers, academics, and teachers of all levels, from novice to expert to guru, the articles contained within this Special Issue are themed around sustainability from nanotechnology, pertaining to diameter measurement, rotor system molecular simulation, ultra-high tensile strength, energy, filtration via membrane distillation, environmental remediation using adsorption, ionic liquids as curing agents, biosensors and bioinspired sensors, and electrical/mechanical properties of polymer nanocomposites. The CNT is a legacy 1D nanomaterial, only after which was 2D graphene able to emerge. This is a global and mixed-country authorship Special Issue, with this reprint containing articles from Canada, Saudi Arabia, China, Russia, Spain, India, Japan, the United Arab Emirates (UAE), the USA, Germany, Turkiye, and Malaysia. The Guest Editor is from Singapore and began publishing critical work on the CNT-polymer interface towards the mechanical properties of the nanocomposite up to 20 years ago.
    Keywords: CNTs ; MWCNTs ; SWCNTs ; polymer composite ; mechanical performance ; flexible capacitive sensors ; bioinspired spinosum ; CNT/PDMS nanocomposite ; tires ; transmission system ; carbon nanotube (CNT) ; hydroxyl groups ; response speed ; energy dissipation ; carbon nanotubes ; carbon nanotube fibers ; tensile strength ; defect control ; controlled preparation ; dielectric polymer composites ; permittivity ; polymer nanocomposite ; electrical conductivity ; mixing ; polymer blends ; electromagnetic interference shielding ; carbon nanotube ; filler migration ; polyethylene ; lead ; arsenic ; adsorption ; poly(amidoamine) ; silver nanoparticles ; biosensor ; virus ; SARS-CoV-2 ; toxicity ; biocompatibility ; electrospinning ; electrospraying ; nanomaterials ; nanostructured membrane ; nanocomposites ; seawater desalination ; temperature polarization ; flux ; solar energy ; dye degradation ; surface plasmon resonance effect ; TiO2/rGO/Ag ; hybrid nanostructures ; phosphorus ; encapsulation ; lithium-ion batteries ; atomic force microscopy ; diameter ; nanometrology ; epoxy resin ; ionic liquid ; nanocomposite ; curing agent ; dispersing agent ; mechanical properties ; lap shear ; conductivity ; melt-mixing ; polymer composites ; SWCNT ; PMMA ; n/a ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 10
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-11-17
    Description: The purpose of this Special Issue is to celebrate 25 years of “World Wetlands Day”. There is no other ecosystem that has its very own Ramsar Convention or such a challenge impacting ecosystem sustainability. Papers for this Special Issue provide an overview of wetland status and function within different regions of the world. The papers in this Special Issue of Land consist of three review papers, ten research articles and one perspective paper. Edward Maltby’s review paper provides us with an overview of the paradigm shift of how we value and assess wetlands over time. Ballut-Dajud et al. provide us with a worldwide perspective on factors affecting wetland loss. Finally, Jan Vymazal provides us with a historical overview of the development of water quality treatment wetlands in Europe and North America. The research papers can be grouped into four groups: 1) use of remote sensing to analyze stability and dynamic factors affecting wetlands; 2) factors affecting the wetlands’ ability to store carbon; 3) assessment of wetlands effect on water quality; and 4) understanding historical use and value of wetlands, farmer’s attitudes about wetland management, and how we can value wetland ecosystem services. Finally, Bryzek et al. remind us that, as wetland researchers and managers, we should minimize damage to wetlands even through field monitoring work.
    Keywords: cyanobacteria ; phosphorus ; restoration ecology ; water quality ; wetland ; wetland soil ; microbial respiration ; CO2 efflux ; Everglades ; enzyme activity ; grazing ; created wetlands ; freshwater marshes ; carbon cycling ; wetlands ecosystems ; moral norms ; self-identity ; theory of planned behavior ; sustainability ; Poyang Lake ; ecosystem service value ; lakeshore zone ; Landsat ; remote sensing ; spatial–temporal changes ; human activities ; ghost forest ; forested wetland ; aboveground biomass ; soil carbon ; carbon dating ; constructed wetlands ; macrophytes ; pollution ; wastewater ; wetlands ; colonization ; nature-culture relationship ; perceptual typology ; coastal wetlands ; tidal flat reclamation ; stability ; impact ; Jiangsu coastal area ; anthropogenic activities ; climate change ; terrestrial ecosystems ; environmental impacts ; greenhouse gases ; cleaning ; efficacy ; ethics ; researcher impacts ; wetland decontamination ; wetland management history ; Ramsar convention ; wise use ; wetland assessment methods ; wetland valuation ; wetlands paradigm shift ; ecosystem approach ; wholescapes ; sustainable development ; World Charter for wetlands ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCN Environmental economics
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  • 11
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-05-06
    Description: This book, entitled “Elemental Concentration and Pollution in Soil, Water, and Sediment”, presents an updated overview of the main trace elements in living organisms. This collection brings researchers from different fields together, including those from biogeochemistry and ecotoxicology in various environmental media, in order to provide a more comprehensive understanding of the environmental fate of trace elements in their biogeochemical cycles for different ecosystems.
    Keywords: marine sediments ; trace metals ; speciation ; contamination ; San Simon Bay ; soil remediation ; toxicity bioassays ; humic substances ; calcium carbonate ; iron oxides ; polyphenolic compounds ; heavy metals ; soil ; enrichment factor ; geoaccumulation index ; contamination factor ; pollution indices ; soil contamination ; geogenic and anthropogenic origin ; iron ore deposits ; tailing dumps ; seepage water ; water balance of the enterprise ; metals ; p-arsanilic acid ; adsorption ; natural fluorine-enriched soil ; natural sources ; chemical extraction resistance ; low washing efficiency ; lacustrine sediments ; geochemical mapping ; spatial distribution ; contamination assessment ; environmental risk assessments ; sediment quality guidelines ; pollution ; bottom sediments ; river ; acid mine drainage ; abandoned coal mine ; potentially toxic elements ; pollution level ; potential ecological risk ; sewage sludge ; calcareous soil ; extraction DTPA ; crop ; transfer ; long time ; engineered nanoparticles ; organic matter ; phosphorus ; nutrients ; volcanic soil ; agricultural land contamination ; sediment ; irrigation canal ; heavy metal ; copper ; cadmium ; Daphnia pulex ; ecotoxicology ; LC50 ; ecological risk assessment ; karst areas ; soil properties ; urban ecology ; trace metal pollution ; soil organisms ; diversity ; Western Siberia ; snow pollution ; trace metals and metalloids ; atmospheric depositions ; solubility ; sediments ; bioindicators ; geochemical background ; risk assessment code ; sequential extraction ; groundwater ; precipitation ; caustic calcined magnesia (CCM) ; permeable reactive barrier (PRB) ; natural water ; water quality ; Arctic region ; elemental composition ; springs ; QR code ; modern sedimentation processes ; mineralogy ; geochemistry ; authigenic minerals ; hydrogen sulfide contamination ; arid climate ; Caspian Sea ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PN Chemistry
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  • 12
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-05
    Description: Hardwood-dominated temperate forests (mostly in Eastern North America, Europe, North East Asia) provide valuable renewable timber and numerous ecosystem services. Many of these forests have been subjected to harvesting or conversion to agriculture, sometimes over centuries, that have greatly reduced their former extent and diversity. Natural regeneration following harvesting or during post-agricultural succession has often failed to restore these forests adequately. Past harvesting practices and the valuable timber of some species have led to a reduction in their abundance. The loss of apex predators has caused herbivore populations to increase and exert intense browsing pressure on hardwood regeneration, often preventing it. Particularly important are fruit, nut and acorn bearing species, because of their vital role in forest food webs and biodiversity. Restoring hardwood species to natural forests in which they were formerly more abundant will require a number of forest management actions (e.g., resistant hybrids, deer exclosures/protectors, enrichment planting, underplanting, etc.). Similarly, reforesting areas that were once natural forests will also require new silvicultural knowledge. Global warming trends will intensify the need for interventions to maintain the diversity and function of temperate hardwood forests, as well as for increase hardwood reforestation.
    Keywords: QH301-705.5 ; QH540-549.5 ; Q1-390 ; Fagaceae species ; soil disturbance ; non-timber forest products ; precision restoration ; protected landscape area ; tree selection ; cultural diversity ; Quercus rubra ; hardwood restoration ; enrichment planting ; sub-tropical hardwoods ; agroforestry ; herbicide effects ; biological diversity ; competition ; Juglans nigra L. ; understorey ; invasive plants ; wildfire ; forest restoration ; Quercus macrocarpa ; riparian forest restoration ; vegetation management ; assisted migration ; sugar maple ; deer browsing ; species composition ; tolerance ; phosphorus ; growth efficiency index ; floristic quality index ; shelterwood ; Carya cordiformis (Wangenh.) K. Koch ; monitoring ; indicators ; seed predation ; Bioclimatic niche ; non-parametric correlation ; unmanaged forest ; Native Americans ; abandoned agricultural field ; native mixed forests ; tree vigor ; forest diversity ; predation ; weed control ; nitrate ; facilitation ; inventory ; hardwoods ; Mexican tree species ; yellow birch ; tree plantation ; seedling establishment ; deer abundance ; avian guilds ; Pinus strobus L. ; Central Hardwood Forest region ; Pinus strobus ; Durango ; MaxEnt ; Juglans nigra ; oak regeneration ; forest regeneration ; Quercus rubra L. ; deer herbivory ; ecosystem services ; tree shelter ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences
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  • 13
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-04-05
    Description: This Special Issue “Innovative Conservation Cropping Systems and Practices” is focused on the development and assessment of innovative conservation cropping systems and practices in determining system productivity and enhancing crop production and soil quality. It covers applied engineering for achieving a sustainable balance between productivity, environmental, and profitability factors, presenting a collection of research articles that cover a broad range of cropping systems and practices from the farmland ecosystem.
    Keywords: straw management ; potassium fertilizer ; rice–oilseed rape rotation ; yield ; bacterial community ; fungal community ; rice ; intercropping ; water mimosa ; pest and disease ; microclimate ; grain quality ; maize ; root system architecture ; nitrogen rates ; cultivars ; phytoremediation ; secondary salinization ; salt tolerance ; microbial diversity ; nutrient accumulation ; conservation tillage ; metabarcoding ; smash ridging ; soil chemical properties ; soil microbial diversity ; sugarcane ; coastal salt-affected soil ; one-crop-per-annum cropping ; fallow mulching ; salt accumulation ; crop growing ; nitrogen rate ; nitrogen ratio ; regenerative ability ; reduced tillage ; no tillage ; side deep fertilizing of machine-transplanted rice ; root function ; photosynthesis ; ammonia-oxidizing bacteria ; integrated fertilization regime ; N2O emission factor ; N2O flux ; purple caitai fields ; C:N ratio ; net ecosystem exchange ; soil microbial carbon ; soil microbial nitrogen ; rice production ; CH4 ; N2O ; water productivity ; global warming ; interspecific competition ; land equivalent ratio ; planting pattern ; root length density ; root morphological characteristics ; biochar ; maize–cabbage system ; crop quality ; N utilization efficiency ; soil inorganic N ; straw returning ; soil microbes ; carbon source utilization ; grey relational analysis ; path analysis ; ratoon rice ; nitrogen balance ; reactive nitrogen losses ; nitrogen surplus ; nitrogen-use efficiency ; no-till ; straw return ; soil organic carbon fractions ; soil aggregate ; bacterial diversity ; rice–crayfish coculture ; different rice varieties ; controlled-release fertilizer ; dry matter accumulation ; rice growth characteristics parameters ; apple-ryegrass intercropping ; photosynthetic characteristics ; soil salinity ; soil moisture content ; fruit quality ; lake sediment ; phosphorus ; Chinese cabbage ; phoD gene ; high-throughput sequencing ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::T Technology, engineering, agriculture
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  • 14
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: This book deals with the latest developments regarding urban and industrial wastewaters’ adapted treatment with various technologies. It focuses, through valuable publications, on the shifting of the wastewater management paradigm from “treatment and disposal” to “the 4Rs principle: Reduce, Recycle, Reuse, and Recover”. The adapted wastewater treatment step will allow (i) the disposal of supplementary water amounts that could be safely reused in order to tackle the water-scarcity problem, and (ii) the preservation of the environment against pollution. Finally, this book will contribute to the achievement of the United Nations Sustainable Development Goals and other international related initiatives.
    Keywords: OMWW ; drying ; water recovery ; water characterization ; sustainable development ; alternating current ; coupling ; hybrid material ; biosorption ; wastewater reuse ; protein adsorption ; neutral solute ; ultrafiltration ; selectivity modelling ; pore size distribution ; raw poultry manure ; pyrolysis ; biochar ; characterization ; leaching ; phosphorus ; potassium ; grey water ; SBR ; fouling ; zeta potential ; norovirus ; water reuse ; water quality ; mineral processing ; wastewater treatment ; flotation ; electrocoagulation (EC) ; chemical oxygen demand (COD) ; polyhydroxyalkanoates ; PHA ; PHBV ; mixed microbial culture ; green extraction ; dimethyl carbonate ; purification ; 1-butanol ; wastewater valorization ; reclaimed water ; circular economy ; anaerobic digestion ; biogas ; reuse ; water pricing ; water depletion ; industrial sector ; lignite ; heavy metals ; adsorption ; batch ; isotherm ; mechanism ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
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  • 15
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: Climate and anthropogenic changes impact the conditions of erosion and sediment transport in rivers. Rainfall variability and, in many places, the increase of rainfall intensity have a direct impact on rainfall erosivity. Increasing changes in demography have led to the acceleration of land cover changes in natural areas, as well as in cultivated areas, and, sometimes, in degraded areas and desertified landscapes. These anthropogenized landscapes are more sensitive to erosion. On the other hand, the increase in the number of dams in watersheds traps a great portion of sediment fluxes, which do not reach the sea in the same amount, nor at the same quality, with consequences on coastal geomorphodynamics. This book is dedicated to studies on sediment fluxes from continental areas to coastal areas, as well as observation, modeling, and impact analysis at different scales from watershed slopes to the outputs of large river basins. This book is concentrated on a number of keywords: “erosion” and “sediment transport”, “model” and “practice”, and “change”. The keywords are briefly discussed with respect to the relevant literature. The contributions in this book address observations and models based on laboratory and field data, allowing researchers to make use of such resources in practice under changing conditions.
    Keywords: TA1-2040 ; T1-995 ; proglacial channels ; watershed ; practice ; modeling ; reservoirs ; degradation ; rill development ; Mediterranean Maghreb Basin ; urban drainage system ; fluvial erosion ; Wadi Mina ; Algeria ; sewer systems ; climate change ; phosphorus ; complex morphodynamics ; incipient deposition ; riverbed ; limiting tractive force ; ruptures ; runoff ; flooding ; soil loss ; suspended sediment ; sedimentation ; sediment ; transfer ; erosion ; specific degradation ; soil erosion ; Xihe River Basin ; water fluxes ; sediment fluxes ; environmental change ; field measurements ; dynamical downscaling ; mixed-size bed material ; two-phase flow ; agriculture ; sloping flume experiments ; mitigation measures ; bed load transport ; shear stress ; flow discharge ; GSD ; shear Reynolds number ; Anthropocene ; human activities ; deposition ; sediment delivery ; soil slurry ; SMBA Dam ; bedload transport ; aggradation ; Czech Republic ; sediment transport ; self-cleansing ; erosion topography ; CCHE1D ; sediment retention ; SWAT model ; migration ; water quality modelling ; hillside reservoirs ; erosion modelling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
    Language: English
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  • 16
    Publication Date: 2024-04-05
    Description: The role of soils for achieving the Sustainable Development Goals is multifarious. Soils are the essential basis for food and biomass provision in support of food security (SDG 2) and energy security (SDG 7). Soil carbon sequestration is paramount for climate action (SDG 13). Soil-mediated water purification and retention, nutrient and matter cycling, and soils habitat functions are essential for maintaining ecosystem services and biodiversity (SDG 15). Healthy soils perform well in all these functions simultaneously. However, the globally increasing demand for food, fiber, and bio-based products poses massive challenges to soil health. Minimizing trade-offs between biomass production and soil health requires systemic approaches to assessment and governance of sustainable soil management in agriculture and food systems. It provides interdisciplinary insights into key questions: What are the impacts of agricultural management practices on sustainability targets in specific geophysical and socio-economic contexts? What are the opportunities and risks of future trends such as climate change, digitalization, and emerging technologies for soil management and soil health? How can institutions and governance instruments be improved to enable decision makers to take action on sustainable soil management? The book was initiated in the frame of the National German research program ‘BonaRes—Soil as a sustainable resource for the bioeconomy’, and it is meant to trigger interdisciplinary thinking.
    Keywords: QH301-705.5 ; Q1-390 ; S1-972 ; land management ; risk assessment ; carob ; N leaching ; Syria ; earthworms ; subsoil ; desertification ; alfalfa ; yield potential ; tenant ; dynamic programming ; soil policy ; monitoring ; resource scarcity ; soil management ; crop–livestock interactions ; German Constitutional Law ; gross income ; Germany ; spatially explicit ; creation ethics ; bayesian network ; agricultural practices ; conventional farming ; soil ; soil degradation ; combination of modern and indigenous knowledge ; Costa Rica ; yield ; soils ; rent price ; fertilization ; sustainability assessment ; societal acceptance ; property rights ; justifying soil protection ; subsoil loosening ; behavioural studies ; governance ; agricultural policy ; water infiltration ; sealing ; soil protection ; soil framework directive ; rent proportion ; soil remediation ; so-called organic fertilizer ; soil compaction ; nutrient composition ; phosphorus ; resource use efficiency ; soil pressures ; soil threats ; Europe ; soil functions ; literature review ; sustainability ; conservation agriculture ; institutions ; environmental zones ; soil health ; landowner ; soil governance ; zero tillage ; coffee by-products ; production ; arid oasis ; Laudato si’ ; soil food web ; land ; compaction ; farmer motivations ; agricultural innovation ; crop rotation modelling ; Driver-Pressure-State-Impact-Response sustainability framework ; contamination ; sustainable soil management ; agricultural yields ; Nicaragua ; sustainable agriculture ; ecosystem services ; legal comparison ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-28
    Description: Herbaceous field crops include several hundred plant species worldly widespread for different end-uses, from food to no-food applications. Among them are included cereals, grain legumes, sugar beet, potato, cotton, tobacco, sunflower, safflower, rape, flax, soybean, alfalfa, clover spp. and other fodder crops, but only 15–20 species play a relevant role for the worldly global economy. Nowadays, to meet the food demand of the ever-increasing world population in a scenario of decreased arable lands, the development of holistic agricultural management approaches to boost contemporaneously yield and quality of herbaceous field crops is essential. Accordingly, this book represents an up-to-date collection of the current understanding of the impact of several agricultural management factors (i.e., genetic selection, planting density and arrangement, fertilization, irrigation, weed control and harvest time) on the yield and qualitative performances of 11 field crops (wheat, cardoon, potato, clary sage, basil, sugarcane, canola, cotton, tomato, lettuce and hemp). On the whole, the topics covered in this book will ensure students and academic readers, such as plant physiologists, environmental scientists, biotechnologists, botanists, soil chemists and agronomists, to get the information about the recent research advances on the eco-sustainable management cultivation of herbaceous field crops, with a particular focus on varietal development, soil nutrient and water management, weed control, etc.
    Keywords: planting density ; fertilization ; the central composite design ; fiber yield ; analog optimization ; potato ; nitrogen fertilization ; environmental sustainability ; cost-effective ; nitrogen use efficiency ; tuber yield ; EONFR ; growth ; specific leaf nitrogen ; critical nitrogen uptake ; cotton ; dry matter yield ; root growth ; root physiology ; water productivity ; nitrogen productivity ; drip irrigation quota ; lint yield ; biomass ; leaf chlorophyll fluorescence ; leaf gas exchange ; leaf structure ; drought tolerance ; dry weight yield ; essential oil content ; leaf area index ; Ocimum basilicum ; potassium ; fertilizer ; biomass accumulation ; fiber quality ; organic farming system ; yield ; pH ; soluble solid content ; Bostwick viscosity ; phosphorus sensitivity ; phosphorus ; reproductive organ biomass ; nutrients accumulation ; plant density ; nitrogen fertilization rate ; photosynthesis rate ; SPAD readings ; nitrogen efficiency indices ; tuber nutritional composition ; cereal crops ; plant water extracts ; bioherbicides ; weed management ; allelopathy ; dual purpose canola ; nitrogen fertilizer ; oil content ; grazing ; sustainable agriculture ; integrated weed management ; yield losses ; preventive weed control ; mechanical weed control ; physical weed control ; biological weed control ; herbicides ; hybrids ; wheat ; weeds ; competition ; genetic gain ; genomic selection ; quantitative genetics ; sugarcane breeding ; pit plantation ; planting patterns ; ratoon crop ; sowing techniques ; sugarcane yield ; quality ; seasonal variation ; fatty acids ; free sugars ; chemical composition ; Cynara cardunculus L. ; cardoon ; organic acids ; clary sage ; essential oil ; aromatic plant species ; biometric and agronomic characteristics ; arbuscular mycorrhizal fungi ; organic farming ; calcareous soils ; crop physiology ; sustainability ; diatomaceous earth ; monosilicic acid ; Si application method ; soil water conditions ; wheat cultivar ; tocopherols ; lipidic fraction ; companion plants ; N-fertilization ; partial land equivalent ratio (PLER) ; weed control ; grain quality ; productivity ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: This Special Issue of Minerals presents recent, select studies that highlight advances in the fields of hydro- and biohydrometallurgy. It aims to attract the interest of readers and especially of young scientists and students in this fascinating scientific discipline.
    Keywords: TA1-2040 ; T1-995 ; n/a ; counter-current leaching ; metal extraction ; slag ; low-grade saprolitic laterite ; agglomeration ; bioleaching ; white metal ; precipitation ; iodide ; seawater ; reducing agent ; chloride ; chalcopyrite ; pyrite–arsenopyrite galvanic pair ; frontier orbital methods ; acid media ; bottom ash ; phosphorus ; manganese nodules ; waste reuse ; galvanic effect ; gold diiodide ; municipal solid waste incineration ; jarosite ; column leaching ; secondary mining ; iodide-oxidizing bacteria ; leaching ; primary sulfide copper ; heap leaching ; electrochemical ; optimization of parameters ; chloride ion ; reductive mineral dissolution ; tailings ; curing ; acid leaching ; secondary products ; uranium ; ferric ion ; Acidithiobacillus ; limonitic laterites ; iron reduction ; fluorapatite ; nitrate ; gold ; phosphate mineral ; purification ; iodine ; nickel ; sodium sulfite ; pregnant leach solution ; copper sulfide ; sulphuric acid ; laterites ; REE ; pretreatment ; triiodide ; laterite ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
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  • 19
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-02-02
    Description: The continuous and widespread deterioration of lake water quality and eutrophication is not only a local problem, but also a global phenomenon. It is not only destroying, or at least limiting, the valuable water resources for daily life, but threatening the water security of sustainable social development. More importantly, along with the rapid accumulation of the alga, including novel hypertoxic viruses and new toxic chemicals, as well as other organic compounds, these stressors threaten aquatic life, biodiversity and endanger our health.This Special Issue highlights and discusses major threats to Plateau Lakes water quality, and provides an update on both lake current status, as well as future challenges. Lake problems, such as pollution and eutrophication, require that we quantify how serious the situation is, identify the probable causes, and recommend how to control the pollution in order to restore and protect water quality. More importantly, this Special Issue stresses the need to manage the lakes and the watershed under a unified approach.
    Keywords: external loading ; internal loading ; water quality ; tributary ; Lake Xingyun ; Lake Chenghai ; Yunnan ; water quality parameters ; seasonality ; spatial heterogeneity ; La-modified material ; macrophyte ; sediments ; phosphorus ; eutrophication ; particulate organic matter (POM) ; carbon and nitrogen stable isotopes ; source tracing ; ecosystem degradation ; Caohai Lake ; middle reach of the Jinsha River ; cascade hydropower development ; regression discontinuity analysis ; Lake Lugu ; thermal stratification ; seasonal changes ; Lake Qilu ; seasonal variation ; water temperature ; dissolved oxygen ; chlorophyll-a ; pH ; turbidity ; plateau lake ; nutrient limitation transformation ; nutrient threshold ; alkaline lake ; phytoplankton blooms ; Lake Yangzong ; temporal and spatial variations ; cyanophyte relative quantity index ; nutrient reduction ; n/a ; Lake Yilong ; spatial-temporal variations ; anthropogenic activities ; Lake Erhai ; temperature ; Chl-a ; nutrient elements ; heavy metal elements ; spatiotemporal characteristics ; entropy method-fuzzy evaluation method ; principal component analysis ; spatial variation ; temporal variation ; bic Book Industry Communication::R Earth sciences, geography, environment, planning
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-09
    Description: The purpose of this book was not to provide a comprehensive overview of the vast arena of how fungi and fungal metabolites are able to improve human and animal nutrition and health; rather, we, as Guest Editors, wished to encourage authors working in this field to publish their most recent work in this rapidly growing journal in order for the large readership to appreciate the full potential of wonderful and beneficial fungi. Thus, this Special Issue welcomed scientific contributions on applications of fungi and fungal metabolites, such as bioactive fatty acids, pigments, polysaccharides, alkaloids, terpenoids, etc., with great potential in human and animal nutrition and health.
    Keywords: fungal pigment ; natural dye ; spalting ; Scytalidium cuboideum ; dramada ; sustainable clothing ; selenium ; biofortification ; transporters ; mycorrhizal fungi ; plant growth-promoting rhizobacteria (PGPRs) ; fungal pigments ; textile dyeing ; toxicity testing ; biotechnological approaches ; challenges ; limits ; Saccharomyces boulardii ; Saccharomyces cerevisiae ; probiotics ; gastrointestinal tract ; Alginate ; β-glucan ; oligosaccharides ; elicitation ; Sargassum species ; Sparassis latifolia ; polyphenol ; antioxidant ; agave mezcalero bagasse ; apple bagasse ; solid-state fermentation ; secondary metabolites ; Pleurotus ostreatus ; Endophytic fungi ; Hyptis dilatata ; Pestalotiopsis mangiferae ; Pestalotiopsis microspora ; chemical elicitors ; antibacterial activity ; LC–ESI–Q–TOF–MS ; yeast ; biological control ; postharvest decay ; fruit ; mycorrhizae ; elevated CO2 ; Thymus vulgare ; growth ; photosynthesis ; metabolites ; biological activity ; Candida albicans ; non-albicans Candida species ; Candida auris ; aromatic alcohols ; fungi ; metabolomics ; NTCD ; additives ; functional foods ; nutraceuticals ; sustainability ; healthy aging ; Mortierella alpina ; animal fat by-product ; arachidonic acid ; ATR-FTIR spectroscopy ; Mucor circinelloides ; high-throughput screening ; metal ions ; phosphorus ; lipids ; biofuel ; FTIR spectroscopy ; bioremediation ; co-production ; natural colorants ; filamentous fungi ; stirred-tank bioreactor ; biodegradable films ; food package ; bioactive compounds ; FIP ; human health ; immunomodulation ; induced apoptosis ; lectin ; medicinal mushrooms ; polysaccharide ; terpenes and terpenoids ; melanin ; carotenoids ; polyketides ; azaphilones ; antitumor ; medical roles ; sphinganine-analog mycotoxins ; fumonisins ; AAL-toxin ; chemical structure ; toxicity ; genetics and evolution ; biosynthesis ; livestock ; ewes ; energy ; cytokines ; yeasts ; liquid swine diets ; MALDI-TOF ; biochemical identification ; growth temperature Ancom Gas Production System ; Candida krusei ; Candida lambica ; M. purpureus ; red yeast rice ; cholesterol reduction ; probiotic potential ; natural colorant ; extraction ability ; marine fungi ; Talaromyces albobiverticillius ; aqueous two-phases system extraction ; ionic liquids ; feed additive ; probiotic ; Sporidiobolus ruineniae ; tannase ; micro-fungi ; macro-fungi ; Ganoderma ; kombucha ; anticancer ; carotenoid ; medicinal mushroom ; mycobiome ; antimicrobial ; antifungal ; bioconversion ; cheese ; dairy ; Sclerotinia ; secondary metabolite ; endophytic fungi ; uncommon secondary metabolites ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-09-11
    Keywords: Laurus nobilis ; medicinal plant ; mobile genomic elements ; germplasm characterization ; Mediterranean region ; chloroplast ; Ipomoea batatas ; simple sequence repeat ; sweet potato ; plant germplasm ; landrace rice ; fat-soluble nutraceuticals ; β-sitosterol ; genetic variability ; cluster analysis ; Solanum melongena ; germplasm ; Greece ; islands ; mainland ; phenotyping ; genotyping ; mineral composition ; landraces ; genetic diversity ; genetic structure ; Panax ginseng ; Triticum turgidum ; HMW glutenins ; LMW glutenins ; gluten quality ; non-allelic interactions ; combined analysis ; evolution ; genetic resources ; Zea mays ; Blumeria graminis ; disomic addition line ; molecular cytogenetics ; wheat ; Psathyrostachys huashanica ; natural variation ; maize ; root length ; domestication selection ; ZmMADS60 gene ; genetic basis ; GWAS ; eating and cooking qualities ; rice ; genetic variation ; eggplant ; cropping condition ; yield ; agro-morphological characterization ; chili pepper ; gene bank ; molecular markers ; morphological descriptor ; DArTseq markers ; GBS ; Triticum aestivum ; starch ; SNP ; InDel ; CAPS ; intron-loss ; NGS ; phosphorus use efficiency ; phosphorus ; proteomics ; grain hardness ; PIN ; kernel texture ; triticum ; SKCS ; Cucumis sativum ; downy mildew ; genetics ; inheritance ; oomycetes ; resistance ; rice genotypes ; blast resistant genotype ; genotypic coefficient of variation (GCV) ; phenotypic coefficient of variation (PCV) ; heritability values ; DArT SNP markers ; early maturity ; heat and drought tolerance ; salt stress ; nitrogen metabolism ; oxidative stress response ; G6PDH ; GDH ; GS/GOGAT ; Triticum aestivum L. ; γ-gliadins ; Gli-B1 ; polymorphism ; PCR analysis ; ginseng ; genetic composition ; SSR ; fonio ; fonio millet ; white fonio ; Digitaria exilis ; agro morphological descriptors ; phenotypic diversity ; neglected and underutilized species (NUS) ; genetic improvement ; catechin ; phytochemicals ; targeted-oriented core collection ; tea germplasm ; agronomic performance ; correlation analysis ; malawi ; pigeonpea ; yield stability ; bermudagrass ; forage breeding ; genetic parameters ; genotype by harvest interaction ; Tifton 85 ; accessions ; descriptors ; anthracnose ; Colletotrichum lentis ; disease screening ; lentil ; plant resistance ; tall wild pea ; Pisum sativum subsp. elatius ; neoplasm ; pea weevil ; Bruchus pisorum ; expressivity ; Africa ; cowpea ; microsatellites ; Aegilops ; triticale ; leaf rust ; stripe rust ; yellow rust ; Puccinia ; drought ; Phaseolus vulgaris L. ; plant breeding ; rhizobia ; stress ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences
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  • 22
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-28
    Description: Different types of pressures, such as nutrients, micropollutants, microbes, nanoparticles, microplastics, or antibiotic-resistant genes, endanger the quality of water bodies. Evidence-based pollution control needs to be built on the three basic elements of water governance: Monitoring, modeling, and management. Monitoring sets the empirical basis by providing space- and time-dependent information on substance concentrations and loads, as well as driving boundary conditions for assessing water quality trends, water quality statuses, and providing necessary information for the calibration and validation of models. Modeling needs proper system understanding and helps to derive information for times and locations where no monitoring is done or possible. Possible applications are risk assessments for exceedance of quality standards, assessment of regionalized relevance of sources and pathways of pollution, effectiveness of measures, bundles of measures or policies, and assessment of future developments as scenarios or forecasts. Management relies on this information and translates it in a socioeconomic context into specific plans for implementation. Evaluation of success of management plans again includes well-defined monitoring strategies. This book provides an important overview in this context.
    Keywords: diffuse pollution ; field mapping ; storm drains ; Bayesian statistics ; distributed modelling ; PhosFate ; water quality ; analysis method ; chromaticity measurement ; surface fitting ; concentration of dissolved matter ; Copernicus Programme ; ACOLITE ; flooding ; quasi-real time monitoring ; inundation mapping ; suspended matter ; Spain ; cyanobacteria ; Microcystis aeruginosa ; water ; monitoring ; spectrophotometry ; derivative absorbance ; model evaluation ; nitrogen ; nutrient retention ; phosphorus ; sediment ; constructed wetland ; water resources management ; eutrophication ; unmanned surface vehicle ; water monitoring ; ensemble learning ; dynamic power management ; observational process ontology ; water quality monitoring ; water pollution alert ; semantic discovery ; water quality status ; sources and pathways ; land cover ; digital elevation model ; urban river ; ArcGIS ; modeling ; CSO ; urban drainage ; sewer system ; trace pollutants ; urban runoff ; concentration duration frequency curve ; MONERIS ; diffuse nutrient emission ; empirical modeling ; river basin management plan of Hungary ; effectiveness of measures ; scenarios and forecasts ; socioeconomic context ; sources and pathways of water pollution ; system understanding ; water governance ; water quality statuses and trends ; water pollution control ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCV Economics of specific sectors::KCVG Environmental economics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology::TQK Pollution control
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  • 23
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-01-08
    Description: With the development of modern society, environmental pollution and energy shortages have become the focus of attention worldwide. Most of the global energy supplies are generated from fossil fuel, which gives rise to environmental pollution and climate change. Photocatalysis technology, which can directly convert solar energy into high value-added fuel and chemical materials or degrade a wide range of organic pollutants into easily degradable intermediates or less toxic small molecular substances, is regarded as one of the most important ways to solve the global energy shortage and environmental pollution problem. This Special Issue focuses on advanced photocatalytic materials, including but not limited to photocatalytic materials for the treatment of indoor air, photocatalytic bacterial inactivation, photocatalytic hydrogen evolution, photocatalytic oxygen evolution, photocatalytic CO2 reduction, photocatalytic hazardous pollutant removal, the photothermal decomposition of pollutants, photoelectrochemical water splitting, etc. This Special Issue provides a platform for scientists to present their original research on “Advanced Photocatalytic Materials for Environmental and Energy Applications”.
    Keywords: PbBiO2I microspheres ; CQDs ; ionic liquid ; charge separation ; interface ; polycrystalline silicon ; solar cells ; low-high-low ; phosphorus diffusion ; semiconductor ; photocatalysis ; indoor air treatment ; volatile organic compounds ; microorganism ; photocatalyst ; type-II heterojunction ; carrier separation ; photodegradation ; phase engineering ; water splitting ; CO2 reduction ; pollutant degradation ; MoS2 ; SnS2 ; composite catalyst ; visible light degradation ; thermo-photocatalysis ; nickel foam ; Ni-doped TiO2 ; acetaldehyde decomposition ; zinc oxide ; Langmuir–Hinshelwood–Hougen–Watson model ; methylene blue ; titanium dioxide ; anodization ; self-doping ; cocatalyst ; Mo2C ; phosphorus ; doped ; g-C3N4 ; photocatalytic ; mixture of pollutants ; coupling system ; plasma ; synergetic effect ; mineralization ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PN Chemistry
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  • 24
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-09
    Description: Written by experts in the field of table olives, this book is a source of recent research advances on the characterization and processing of table olives. Research papers are provided relating to the characterization of their composition of volatiles and the sensory profile; mineral composition and bioavailability; changes in bioactive components (chlorophylls) by processing; and new strategies to reduce sodium and additives for stabilizing the organoleptic properties and avoiding defects in table olives. Other research papers are included in relation to microbiological and chemical changes in table olives during spontaneous or controlled fermentation employing different cultivars, and the optimized use of starter cultures for the improvement of the different fermentative processes. In addition, this book includes an overview of the main technologies used for olive fermentation, including the role of lactic acid bacteria and yeasts characterizing this process, and of the processing and storage effects on the nutritional and sensory properties of table olives.
    Keywords: table olives ; starter cultures ; GC-MC analysis ; volatile composition ; bitterness ; consumer willingness to pay ; descriptive sensory analysis ; green-olive flavor ; “Manzanilla” cultivar ; pit hardening ; regulated deficit irrigation ; panel performance ; panelist ; black ripe table olives ; sensory descriptors ; sensory profile ; fermentation ; microbiological changes ; organoleptic ; physicochemical ; Clostridium ; logistic regression ; acid-adapted strains ; predictive models ; fermented vegetables ; undefined biodiverse starters ; autochtonous cultures ; lactic acid bacteria ; Lactobacillus pentosus ; Tonda di Cagliari ; table olive ; phenolic compounds ; oleuropein ; LAB ; yeasts ; fermented food ; probiotic table olives ; non-dairy probiotics ; sodium ; potassium ; calcium ; magnesium ; iron ; phosphorus ; darkened by oxidation olives ; Miller’s protocol ; Crews’ protocol ; post-digest re-extraction ; minerals ; sea salt ; PGI ; iodized salt ; functional food ; composition ; nutritional properties ; polyphenols ; sensory analysis ; chlorophyll ; pigments ; allomerization ; alkaline treatment ; phytyl-chlorin ; phytyl-rhodin ; Bella di Cerignola ; brines ; microbiological quality ; user-friendly spreadsheet ; producers ; bioaccessibility ; mineral nutrients ; pigment composition ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: The papers in this SI present valuable results in the topics of soils, sediments, and water contamination according to the consideration of ecological and health risk. They also point out open questions and possible avenues for future research. Biochar application can benefit both soil conservation and contamination, but further research should be conducted to investigate whether these positive effects can be extended to the field scale. Similar to biochar, scale-up design will be helpful for thin-layer capping in in situ sediments using mixed active amendments. Both physiochemical analysis and bioassays mutually supported the evaluation results of river water quality. However, we need better approaches and policies for management to prevent further contamination from the discharge of untreated industrial and domestic waste into this aquatic ecosystem. The use of microorganisms to eliminate antibiotics is a promising strategy, but future work should verify the biodegradation ability of antibiotic-degrading bacteria in wastewater treatment plants.
    Keywords: heavy metal ; pollution ; antioxidant ; enzyme ; biomarkers ; ecological risk ; bioaccessibility ; cadmium ; chemical form ; husk biochar ; risk assessment ; active capping ; toxic metal ; sediment ; remediation ; multiple materials ; mercury ; methylmercury ; salinity ; biochar ; organic carbon ; nutrients ; leaching ; nitrogen ; phosphorus ; potassium ; sludge ; antibiotics ; biodegradation ; bioassays ; gold mining ; health risk ; microbiological indicators ; mutagenicity ; toxicity ; green and sustainable remediation ; SDGs ; thin-layer capping ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
    Language: English
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  • 26
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-05
    Description: Human milk is uniquely tailored to meet infants’ specific nutritional requirements. However, it is more than just “milk”. This dynamic and bioactive fluid allows mother–infant signalling over lactation, guiding the infant in the developmental and physiological processes. It exerts protection and life-long biological effects, playing a crucial role in promoting healthy growth and optimal cognitive development. The latest scientific advances have provided insight into different components of human milk and their dynamic changes over time. However, the complexity of human milk composition and the synergistic mechanisms responsible for its beneficial health effects have not yet been unravelled. Filling this knowledge gap will shed light on the biology of the developing infant and will contribute to the optimization of infant feeding, particularly that of the most vulnerable infants. Greater understanding of human milk will also help in elucidating the best strategies for its storage and handling. The increasing knowledge on human milk’s bioactive compounds together with the rapidly-advancing technological achievements will greatly enhance their use as prophylactic or therapeutic agents. The current Special Issue aims to welcome original works and literature reviews further exploring the complexity of human milk composition, the mechanisms underlying the beneficial effects associated with breastfeeding, and the factors and determinants involved in lactation, including its promotion and support.
    Keywords: QH301-705.5 ; Q1-390 ; TX341-641 ; high pressure processing ; n/a ; lipids ; supplementation ; protective factors ; infant ; carbohydrate ; mothers ; antioxidant capacity ; protein ; fat ; cytokines ; bioactive factors ; late preterm ; zinc ; infants ; docosahexaenoic acid (DHA) ; pregnancy ; eicosapentaenoic acid (EPA) ; Lipidomics ; magnesium ; omega-3 fatty acids ; vitamin D deficiency ; flow injection analysis ; human milk benefits ; multiple source method ; 3?-sialyllactose (3?SL) ; milk banking ; milk group ; pasteurization ; video instruction ; Milk Fat Globule Membrane ; bile salt stimulated lipase ; breastfeeding difficulties ; breastfeeding support ; prematurity ; carotenoids ; hormones ; phosphocholine ; amino acids ; targeted metabolomics ; high-performance liquid chromatography (HPLC) ; choline ; selenium ; ?-linolenic acid ; arachidonic acid (ARA) ; docosahexaenoic acid ; human milk fortification ; protease inhibitors ; celiac disease ; copper ; term ; adipokines ; iodine ; mammary gland ; nutritional status ; food frequency questionnaire ; neonate ; early breastfeeding cessation ; prospective study ; breastfeeding ; mothers’ own milk ; disialyllacto-N-tetraose (DSLNT) ; country ; lactating women ; undernourishment ; proteases ; preterm ; expressing ; dietary assessment ; retinol ; body composition ; duration of lactation ; passive immunization ; 2?-fucosyllactose (2?FL) ; phosphorus ; clinical trial ; growth factors ; infant formula ; digestive tract ; human milk oligosaccharides (HMO) ; sodium ; nutrition ; eicosapentaenoic acid ; lipid metabolites ; lactation ; nervonic acid ; ?-tocopherol ; macronutrients ; glycoprotein ; term infant ; term infants ; maternal diet ; promotion of breastfeeding ; potassium ; antioxidants ; maternal immunoglobulins ; Human Milk ; human milk ; Phospholipids ; flu vaccine ; lactational stage ; lactose ; storage ; dietary intake ; Preterm infant ; immune-active proteins ; colostrum ; human milk fat ; inadequate intake ; milk therapy ; endogenous peptide ; calcium ; fatty acids ; breast milk ; pumping ; secretor ; LC-MS ; n-9 fatty acid ; Lewis ; donor human milk ; antenatal ; online ; iron ; growth ; donor milk ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences
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  • 27
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-30
    Description: Joint replacement is a very successful medical treatment. However, the survivorship of hip, knee, shoulder, and other implants is limited. The degradation of materials and the immune response against degradation products or an altered tissue loading condition as well as infections remain key factors of their failure. Current research in biomechanics and biomaterials is trying to overcome these existing limitations. This includes new implant designs and materials, bearings concepts and tribology, kinematical concepts, surgical techniques, and anti-inflammatory and infection prevention strategies. A careful evaluation of new materials and concepts is required in order to fully assess the strengths and weaknesses and to improve the quality and outcomes of joint replacements. Therefore, extensive research and clinical trials are essential. The main aspects that are addressed in this Special Issue are related to new material, design and manufacturing considerations of implants, implant wear and its potential clinical consequence, implant fixation, infection-related material aspects, and taper-related research topics. This Special Issue gives an overview of the ongoing research in those fields. The contributions were solicited from researchers working in the fields of biomechanics, biomaterials, and bio- and tissue-engineering.
    Keywords: electrocautery ; titanium alloy ; cobalt-chrome alloy ; fatigue behavior ; biomechanical study ; Vertebral body replacement (VBR) ; non metallic ; radiolucent ; CF/PEEK ; biomechanics ; tumor ; vertebral fracture ; spine ; calcium phosphate ; granules ; bone graft substitutes ; total hip arthroplasty ; implant deformation ; acetabulum ; Metasul ; 28 mm small head ; metal-on-metal THA ; cobalt ; chromium ; titanium ; blood metal ions ; inflammation ; cytokines ; metal particles ; metal ions ; synovium ; dual taper modular hip stem ; acetabular revision ; asymptomatic stem modularity ; decision making model ; threshold ; biomaterials ; arthroplasty ; orthopaedic tribology ; experimental simulation ; total knee replacement ; PEEK-OPTIMA™ ; UHMWPE ; third body wear ; modular acetabular cup ; poly-ether-ether-ketone (PEEK) ; ceramics ; ultra-high-molecular-weight polyethylene (UHMW-PE) ; strain distribution ; bone stock ; cup-inlay stability ; disassembly forces ; relative motion ; periprosthetic joint infections ; infection prophylaxis ; Staphylococcus epidermidis ; in vivo osteomyelitis model ; metal wear ; retrieval study ; metal-on-metal articulation ; volumetric wear ; megaendoprosthesis ; total knee arthroplasty ; bone tumor ; Roentgen stereophotogrammetric analysis ; hip arthroplasty ; elementary geometrical shape model ; interchangeability ; head–taper junction ; migration ; ion implantation ; precision casting ; Ti6Al4V ; calcium ; phosphorus ; centrifugal casting ; porous implants ; tantalum ; hip replacement ; revision hip arthroplasty ; primary stability ; backside wear ; cross-linked ; total hip replacement ; hip cup system ; composite ; fibers ; polycarbonate-urethane ; meniscal replacement ; mechanical properties ; meniscus ; silicon nitride ; coating ; joint replacement ; wear ; adhesion ; trunnionosis ; trunnion failure ; fretting corrosion ; head–neck junction ; mechanically assisted crevice corrosion ; implant ; biomaterial ; corrosion ; residual stress ; taper connection ; anodic polarization ; surface treatment ; knee joint ; patellar component ; musculoskeletal multibody simulation ; patellofemoral joint ; polyetheretherketone ; fixation ; debonding ; implant–cement interface ; PMMA ; periprosthetic joint infection ; cement spacer ; articulating spacer ; hip spacer ; two-stage revision ; surface alteration ; surface roughness ; third-body wear ; zirconium oxide particles ; metal-on-cement articulation ; oxford unicompartmental knee arthroplasty ; bearing thickness ; retrieval analysis ; n/a ; biomedical rheology ; viscosity ; bovine calf serum ; shear thinning ; numerical simulation ; thema EDItEUR::K Economics, Finance, Business and Management::KN Industry and industrial studies::KNT Media, entertainment, information and communication industries::KNTX Information technology industries
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-11-30
    Description: As an important unit operation, crystallization is a process in which nucleation, growth, agglomeration, and breakage are regulated to produce high-quality crystals and achieve efficient separation as well as purification. Since a crystallization process often presents the characteristics of strong coupling, nonlinearity, and large lagging, it is a challenge to rationally design a robust, well-characterized process to efficiently crystallize and prepare a high-quality crystalline product. The development of process analytical technology that can provide fast and accurate inline or online measurement is of great importance in the design and control of crystallization processes. Simulation technology, e.g., molecular dynamics simulation and hydrodynamics simulation, can provide time- or location-dependent insight into the process on multiple scales. These experimental and simulation tools can greatly help to further investigate crystallization processes. This Special Issue served to provide a platform for researchers to report results and findings in crystallization process technologies, simulation and process analytical technologies, and relevant crystallization studies.
    Keywords: crystals ; metal-organic frameworks ; Cu(II) ion ; 2D layer ; structural evolvement ; electronic polysilicon ; flow field ; temperature field ; boundary layer ; coupled furnaces ; florfenicol ; solubility ; binary solvent system ; cosolvency ; correlation model ; nanocrystals ; combinative technology ; aqueous solubility ; stability ; dissolution rate ; nucleation ; growth ; mesoscale ; precursor ; EMMS model ; vanadium pentoxide ; cathode ; doping ; rate performance ; crystal image analysis ; deep learning ; size measurement ; crystal growth rate ; silicon single crystals ; floating zone ; effective segregation coefficient ; numerical modelling ; Czochralski growth ; silicon ; crucible ; oxygen concentration ; calcium carbonate ; foreign salts ; antiscalants ; crystallization ; struvite ; fertilizer ; phosphorus ; ammonium ; wastewater ; stirring ; turbulence ; alumina hydrate ; boehmite ; ammonioalunite ; evolutionary process ; reaction crystallization ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: This Special Issue, “Research as a Development Perspective”, is dedicated to data presented at the first Conference in Chemistry for Graduate/Postgraduate Students and PhD candidates at Aristotle University of Thessaloniki, which was the outcome of research conducted by young chemists in Northern Greece. The conference was organized by the Chemistry Department at Aristotle University of Thessaloniki, the Association of Greek Chemists-Division of Central and Western Macedonia, and the Association of Chemists in Northern Greece. The scope of this conference was to provide young chemists (but also last year’s students) with the opportunity to be well prepared for their next career steps in an increasingly demanding job market. Moreover, they had the possibility of presenting their scientific results to a large audience, which strengthened their soft skills. Lastly, the active engagement of students in the organization of the conference enhanced their teamwork abilities, a highly valuable when developing professional maturity.
    Keywords: HPLC-DAD ; bisphenol A ; 4-Hydroxybenzoic Acid ; 4-Hydroxyacetophenone hydroquinone ; Lactococcus lactis ; reversed-phase liquid chromatography ; ionizable and non-ionizable analytes ; isocratic and gradient elution in different eluent pHs ; computer-assisted separation optimization ; visualization of predicted chromatograms ; silk fibroin ; drug delivery ; magnetic silk fibroin ; bovine serum albumin ; food ; sample preparation techniques ; sulfonamides ; high-performance liquid chromatography ; HPLC ; ultra-high-performance liquid chromatography ; UHPLC ; Derveni ; Ancient Macedonia ; micro-XRF ; XRD ; HS-SPME/GC-MS ; ancient medicines ; ancient pharmaceuticals ; shellfish purple ; porphyra ; high-tin bronzes ; bronzes ; phosphorus ; boron ; inductively coupled plasma ; atomic emission spectrometry ; fertilizers ; acid dissolution ; wet digestion ; NSAIDs ; derivatization ; GC-MS ; serum ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
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  • 30
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: This Special Issue presents an extract from the reality of smart agriculture, where the combination of modern technologies, innovative solutions, and sustainable approaches to food production classifies this part of science as highly interdisciplinary, multifaceted, and technologically advanced. The need to increase productivity, optimize natural resources, and minimize environmental impact requires new approaches. In this context, smart agriculture is emerging as a solution that combines technology, data, and science to achieve sustainable, efficient, and innovative food production. This Special Issue introduces the field of smart farming, which encompasses a range of advanced technologies. The use of these tools allows for the monitoring and optimization of crop conditions, precise fertilization, the minimization of water and energy usage, and the improvement of crop quality and quantity. In addition, plant monitoring systems are described, which, by means of sensors and data analysis, provide farmers with valuable information about plant health, soil moisture, temperature, and other factors affecting crop growth. A significant part of this monograph deals with the automation of agricultural processes, where robots and machines undertake tasks with high precision and accuracy, contributing to the farmer’s efficiency. This Special Issue aims not only to provide an understanding of smart agriculture but to also inspire the reader to think about the future of agriculture and the ways in which modern food production methods can be improved.
    Keywords: recirculating aquaculture system ; variable-flow regulation model ; circulating pump-drum filter linkage working technique ; machine learning methods ; gene algorithm support vector machine ; controlled environment agriculture ; digital twin ; productivity ; architecture ; optimization ; NDVI ; image processing ; SURF ; SIFT ; SVM ; BP algorithm ; performance ; sweet pepper ; deep neural network ; sprouts ; stimulation with a pulsed magnetic field ; micro and macro components ; ICP-OES ; ground pressure ; paddy soil ; seeding skateboard ; internet of things ; wireless measurement system ; calcium ; magnesium ; phosphorus ; potassium ; copper ; iron ; manganese ; sodium ; zinc ; wild leafy vegetables ; real-time kinematic (RTK) ; precision agriculture ; ISO standard ; global positioning system (GPS) ; GLONASS ; agricultural tractor ; Korean ginseng ; root-rot-disease ; plant segmentation ; deep learning ; Spodoptera frugiperda ; convolutional neural network ; corn insect ; electrical fields ; magnetic fields ; high-voltage electric field ; growth of fruits ; ripening of fruits ; shelf life of fruits ; fungicide resistance ; PCR ; broad-spectrum fungicides ; Fusarium solani ; toxicity ; asymmetric machine-tractor unit ; motion ; stability ; resistance coefficients ; amplitude-frequency characteristic ; phase-frequency characteristic ; quality parameters ; firmness ; total soluble solid ; titratable acidity ; dry matter ; respiration rate ; apple fruit ; model predictive control ; energy management system ; renewable energy ; smart irrigation ; agriculture 4.0 ; maize bulk ; kernel breakage ; vertical pressure ; deformation ; heat production ; sustainable ; agriculture ; rural ; mobile internet technology ; bivariate probit model ; agricultural modernization ; Pakistan ; wheat ; smart ; Zea mays ; stalk diseases ; crop rotation ; stubble ; suppressive soils ; biomass combustion ; broadleaved tree ; pulsed electric field ; calorific value ; UV-C radiation ; stress response ; mechanical properties ; stimulation ; potato tuber ; CFD (Computational Fluid Dynamics) ; terminal velocity ; winnowing machine separation ; chili pepper harvester ; water and fertilizer integration ; pH adjustment ; BP-PID-Smith algorithm ; estimated compensation ; convolutional neural networks ; MATLAB ; hybrid system ; mobile application ; aeration ; airflow resistance ; pore volume ; semi-empirical modelling ; self-compaction ; spatial and temporal ; energy ; environmental contamination ; lettuce ; life cycle assessment ; winter wheat ; leaf greenness index (SPAD) ; protein ; photosynthesis ; nitrogen ; smart agriculture ; weed management ; crop productivity ; computer vision ; analytical procedure ; forklift truck ; interchangeable equipment ; static stability assessment ; typical meteorological sequence ; typical meteorological week ; wastewater treatment ; high-rate algae pond ; solar irradiance ; Finkelstein-Schafer statistics ; southern rice ; threshing loss ; fuzzy PID ; adaptive algorithm ; hilly mountainous areas ; rapeseed pod ; surface area measurement ; 3-D measurement ; side area of oblique cylinders ; rapeseed pod seed testing machine ; n/a ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-27
    Description: The anthropogenic loading of phosphorus (P) to water bodies continues to increase worldwide, in many cases leading to increased eutrophication and harmful algal blooms. Determining the sources of P and the biogeochemical processes responsible for this increase is often difficult because of the complexity of the inputs and pathways, which vary both in spatial and temporal scales. In order to effectively develop strategies to improve water quality, it is essential to develop a comprehensive understanding of the relationship of P pools with biological uptake and cycling under varied soil and water conditions. In this ebook, eight chapters cover the various aspects of basic-applied research on mineral–P interaction and how these reactions impact P mobilization, bioavailability, transfer, and speciation of P in different soil matrices using advanced analytical methods. Some of these methods include the application of XANES and field-based research related to stream bank legacy nutrients; natural and anthropogenic eutrophication and its relationship to climate change; and the evaluation of the impact of P due to (i) grazing systems, (ii) weathering and vegetation, and iii) soil and manure management practices. In addition, two review chapters take a holistic approach to cover an expansive area of P transformation processes along the cropland–riparian–stream continuum and the assessment of legacy P. Together, these contributions improve our current understanding of the reactions and processes that impact P concentration, speciation, cycling, loss, and transfer from agroecosystems.
    Keywords: eutrophication ; phosphorus ; water quality ; sediment ; dissolved oxygen ; phosphorus mobilization ; climate change ; algae bloom ; legacy sediments ; equilibrium phosphorus concentration ; sorption ; desorption ; anoxic ; chemical P extraction ; microanalysis ; X-ray absorption near-edge structure (XANES) spectroscopy ; soil P ; vertical and horizontal P distribution ; runoff water ; exclusions ; strategic grazing ; dissolved reactive phosphorus ; total phosphorus ; soil test phosphorus ; soil stratification ; soil fertility ; phosphorus cycling ; weathering ; iron speciation ; biogeochemistry ; legacy phosphorus ; speciation ; transformation ; accessibility ; best management practices ; corn silage ; erosion ; nutrient management ; liquid manure ; surface runoff ; agriculture ; riparian buffers ; critical source areas ; overland flow ; hydropedology ; snowmelt ; streamflow ; tile drainage ; phosphorus kinetics ; Fe-Al-hydroxide mixtures ; histidine ; malic acid ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
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  • 32
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-02-01
    Description: Medical mineralogy and geochemistry constitute an important field, yet little attention has been paid to it by scientists, administrators, or the public. The aims of this book are: (a) to focus on a selection of current challenges and research opportunities and (b) to encourage knowledge transfer between geochemists and mineralogists whose work concerns medical problems and medical scientists who study problems surrounding biominerals and geomaterials. This book covers a variety of novel approaches, tools and techniques, and scenarios of contamination in water and wastewater, and is a key resource for policymakers and environmental scientists working hard to address environmental pollutants. The key features are: state-of-the-art techniques for the assessment and remediation of heavy metals, presenting the interdisciplinary impacts of heavy metals, including those on human health, ecosystems and water quality, and including various contamination indices, such as contamination factor, geoaccumulation index, enrichment factor, pollution index and ecological risk index.
    Keywords: phosphorus ; adsorption ; steel slag ; fly ash ; activated clay ; reactor ; Ramganga River ; turbidity ; Landsat 8 SR ; water quality ; Ganges River ; fluoride ; groundwater ; Sustainable Development Goal 6 ; rural community water supply ; weathered basement aquifer ; hydrogeology ; policy change ; risk ; heavy metal ; human health ; pollution indices ; soil ; plant diseases ; nanoparticles ; diseases ; biotic stress ; management ; silver nanoparticles ; zinc nanoparticles ; calcium carbonate nanoparticles ; calcium oxide nanoparticles ; incense sticks ash ; sludge ; eggshell ; terrestrial environment ; radiocesium ; cesium-137 ; radioactive contamination ; cancer risk ; radionuclide ; nuclear accident ; nominal risk ; decision making ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PN Chemistry
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  • 33
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-28
    Description: Duckweed (Lemnaceae) represents a small aquatic monocot plant family presently composed of 36 species. These plants gained importance in recent decades for their applications in wastewater purification, as animal food or human nutrition, as well as for energy production. This Reprint presents 39 manuscripts published in the Special Issue “Duckweed: Research meets applications” of the journal Plants. We provide an overview of the present state of the art of duckweed research in taxonomy of the family, phytoremediation, accumulation of protein or starch, interaction with microorganisms, and phytomonitoring of toxic compounds. This Special Issue also invited the participants of the 6th International Conference on Duckweed Research and Applications (ICDRAs) held in Gatersleben, Germany, organised on behalf of the International Steering Committee on Duckweed Research and Applications (ISCDRAs). This Reprint is organised as follows:1. Introduction; 2. Molecular Characterization and Taxonomy; 3. Phytoremediation: Wastewater; 4. Applications: Accumulation of Protein or Starch; 5. Interaction with Microorganisms; 6. Physiology and Phytomonitoring.The manuscripts were organised by the Guest Editors Viktor Oláh (University of Debrecen, Debrecen, Hungary), Klaus-J. Appenroth (Friedrich Schiller University, Jena, Germany), and K. Sowjanya Sree (Central University Kerala, Periye, India).
    Keywords: Lemnaceae ; remediation ; feed safety ; mineral supplements ; accumulation ; agricultural wastewater ; nutrient recovery ; biosynthesis inhibitor ; duckweed ; occurrence ; overcome ; phytohormones ; wastewater ; density ; surface cover ; circular economy ; lemna ; amino acids ; biomass production ; cultivation ; nutrient medium ; uptake ; water lentils ; yield ; Wolffia sp. ; space plant biology ; astrobiology ; bioregenerative life support system (BLSS) ; biomass ; aquatic plants ; Araceae ; duckweeds ; Lemnoideae ; molecular phylogenetics ; taxonomy ; chlorophyll fluorescence imaging ; PAM fluorometry ; duckweed test ; Spirodela polyrhiza ; phytotoxicity ; hormesis ; interspecific hybrids ; tubulin-based polymorphism ; β-tubulin ; nitrogen assimilation ; nitrate reductase ; nitrite reductase ; glutamine synthetase ; GOGAT ; gene expression ; chlorophyll fluorescence ; electron transport chain ; inflammation ; lutein ; photosystem ; photosynthetic capacity ; relative growth rate ; duckweed-associated bacteria ; Microbacterium ; Azospirillum ; auxin ; AXR1 ; Arabidopsis ; amplified fragment length polymorphism (AFLP) ; biodiversity ; intraspecific diversity ; Lemna minor ; population analysis ; Wolffiella hyalina ; red/blue ratio ; standardized production ; light quality ; light quantity ; controlled environment ; sustainable fish feed ; alternative proteins ; on-growing phase ; barcoding ; chloroplast DNA ; molecular evolution ; aquaponics ; steroid 17β-estradiol ; Scenedesmus quadricauda ; Lemna minor ; fish wastewater ; population growth ; biomolecule synthesis ; machine learning ; image analysis ; machine training ; Lemna ; phytoremediation ; chromosome number ; evolution ; genome size ; karyotype ; microbiome ; 16S rRNA ; metagenome ; stress ; adhesion ; aquatic ; biomonitoring ; microplastics ; microbeads ; anaerobic digestate ; biomass generation ; genotyping ; intraspecific variation ; aquaculture effluents ; IMTA ; RAS ; phytoplankton ; bacteria ; Lemnacea ; alternative protein ; water recovery ; continuous systems ; giant duckweed ; Lymnaea stagnalis ; great pond snail ; microbiota ; adaptation ; herbivory ; tolerance ; resistance ; fatty acids ; DNA barcoding ; diversity ; biogeography ; nitrogen content ; protein concentration ; migration ; heavy metal ; metallothionein ; metal accumulation ; ionomics ; ICP-OES ; micro-XRF ; poly(styrene-co-methylmethacrylate) ; free-floating plant ; freshwater ; microplastic adsorption ; phytotoxic effect ; chronic impact ; manganese toxicity ; ammonium transporter ; transcription factors ; Spirodela ; water pollutants ; nitrogen ; phosphorus ; heavy metals ; agrochemicals wastewater remediation ; plant-microbe interactions ; plant-bacteria associations ; bacterial colonization ; RISA ; Azospirillum brasilense Sp7 ; Azospirillum brasilense Sp245 ; strain-specific primers ; bead-beating ; starch accumulation ; AtPSP1 overexpression ; sulfur deficiency ; Lemna turionifera 5511 ; whole genome sequencing ; abiotic stress management ; biotic stress management ; abiotic stress ; biotic stress ; turion ; Lemna gibba ; polyploidisation ; spontaneous mutation ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PST Botany and plant sciences
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-03-30
    Description: The availability of fresh water of good or high quality is essential for the health of people, animals and the environment. The monitoring and modelling of water resources are therefore strategic for achieving a sustainable and inclusive society. This reprint hosts research and review papers featuring different approaches ranging from engineering and environmental sciences (hydrology, ecotoxicology and remote sensing) to economic disciplines (environmental and circular economy). Contributions may be of interest to both researchers and environmental managers.
    Keywords: water supply system ; risk analysis ; risk management ; safety of water supply ; water supply network ; failures ; risk maps ; Epanet ; Indicators of Hydrologic Alteration (IHA) ; cascade dams ; river regime ; suspended sediment transport ; dissolved load transport ; nutrient transport ; Brda river ; subtropical coastal zone ; waste treatment ; ocean dumping ; antiretrovirals ; predicted environmental concentration ; ecotoxicology ; risk assessment ; pollution effects ; circular economy (CE) ; monitoring ; indicators ; economic indicators ; water ; wastewater ; terrestrial evaporation ; components ; Global Land Evaporation Amsterdam Model (GLEAM) ; increasing trends ; spatial–temporal pattern ; evaporative ratio ; Poland ; satellite images ; hyperspectral data ; water quality ; PRISMA ; DESIS ; turbidity ; chlorophyll-a ; aquatic vegetation ; river freezing ; Multilayer Perceptron Neural Network (MLPNN) ; Extreme Gradient Boosting (XGBoost) ; predictor variables ; balanced accuracy ; river flow ; XGBoost algorithm ; trends ; multistep-ahead forecasting ; climate variability ; Ukraine ; phosphorus ; resources ; critical raw materials ; Visegrad Group ; V4 ; sustainable management ; cold season ; 1951–2021 ; snowfall-to-precipitation ratio ; baseflow index ; river regime shift ; lowland river basin ; middle-latitude region ; hydrogeochemical characterization ; seawater intrusion processes ; geothermal water ; mixing processes ; cation exchange ; Los Cabos block ; n/a ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCM Development economics and emerging economies
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: Metals have always played a significant role in human life, and the current global growth and prosperity are directly dependent on these materials. With the rapidly growing global demand for metals, their extraction from natural minerals (as their primary sources) has been enhanced, causing a significant reduction in the grade and quality of the ores in ore deposits and leading to the production of huge amounts of waste, which requires management. In light of this, new proposals to develop more advanced metal recovery technologies from minerals are needed. Additionally, the huge quantity of waste generated through all steps of metal production is known to be a source of environmental pollution, while its valorization can create value via recycling metals or even though use in the production of other valuable materials. Such waste valorization is also in line with the United Nations’ Sustainable Development Goals (SDGs), as well as the implementation of the Paris Agreement. In this regard, the recycling of end-user products in order to reproduce valuable metals can also create significant value and reduce mining activities, and thus, their harmful consequences worldwide. Therefore, research and development in the state-of-the-art technologies for the recovery and recycling of metals are absolutely necessary. The aim of this Special Issue was to collect a range of articles on different aspects of valuable metal recovery and recycling from primary and secondary sources, as well as to decipher all new methods, processes, and knowledge in valuable metal production. We hope that this open access Special Issue will provide a great opportunity to demonstrate the work of researchers working in this area all around the world and help to provide new ideas for researchers who are working in the areas of hydrometallurgy, mineral processing, and waste recycling and valorization.
    Keywords: solvent extraction ; t-BAMBP ; rubidium ; cesium ; brine ; chemical precipitation ; recovery ; reduced ilmenite ; synthetic rutile ; aeration leaching ; Becher process ; spent alkaline battery ; recycling ; leaching ; electrowinning ; hydrometallurgy ; techno-economic evaluation ; metal recovery ; rhenium ; molybdenum ; separation ; rare earth elements ; thorium ; uranium ; separation methods ; precipitation ; membrane ; pavement ; bituminous mixtures ; electric arc furnace slag ; ladle furnace slag ; cellulose fibers ; stone mastic asphalt ; sustainability ; steel ; circular economy ; zinc residue ; cobalt hydroxide ; cementation ; oxidative precipitation ; cobalt (Co) ; nickel (Ni) ; aluminum (Al) ; titanium dioxide (TiO2) ; silicon dioxide (SiO2) ; sulfide ; carbon material ; copper ; zinc ; copper processing ; copper leaching ; copper bearing dusts ; cyanex 272 ; ionquest 801 ; cobalt ; nickel ; vanadium extraction process ; vanadium yield ; minimum carbon loss ; temperature strategy ; steelmaking slag ; phosphorus ; 2CaO∙SiO2–3CaO∙P2O5 ; NdFeB magnets ; critical metals ; rare earth elements (REEs) ; focus infrared digestion ; ICP-OES ; electronic waste ; CaO–SiO2–FeO–Al2O3–MgO slag system ; viscosity ; slag structure ; silicate structure ; aluminate structure ; FeO recovery ; weathered crust elution-deposited rare earth ore ; rare earth recovery ; ion-exchange leaching ; chelation ; chelating agents ; polydentate ligands ; pyrometallurgy ; dysprosium ; liquid metal extraction ; phase transformation ; n/a ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2022-02-24
    Description: Sustainable agricultural practices are needed to provide food security for a growing global population. Food production is usually associated with high nutrient inputs in the form of mineral fertilizers. Since the beginning of agriculture, such practices have led to soil degradation and the release of environmental contaminants. In this Special Issue, we will focus on innovations in organic and inorganic fertilizer production. We welcome studies concerning new approaches for smart fertilizer development, including bioformulations with mineral particles, nanomaterials, and plant growth promoting microorganisms. We especially encourage authors taking advantage of ecological interactions to improve plant nutrient-use efficiency. Moreover, we would like to include contributions that focus on organic amendments to increase or propitiate the terrestrial C sequestration and stabilization, in order to contribute to mitigating climate change at the same time increasing food security by soil fertility, thus making win–win–win scenarios. Such techniques may concern, but are not limited to, innovative organic waste recycling procedures and new applications of mycorrhizae, rhizobioms, or free living soil bacteria and fungi.
    Keywords: earthworms ; frass ; insect excreta ; insect farming ; nitrogen ; phosphorus ; soil fauna ; soil fertility ; waste management ; seed germination ; jellyfish ; blue fertilizer ; soil restoration ; soil amendments ; water use efficiency ; phosphorus sources ; P solubilization ; P acidulation ; relative agronomic efficiency ; pond sediments ; organic fertilizer ; mineral fertilizer ; cucumber ; integrated fish-vegetable farming ; Mekong Delta ; Crotalaria spectabilis ; C. juncea ; 15N natural abundance ; 13C isotopic composition ; transpiration efficiency ; aluminum toxicity ; antioxidant ; barley ; lignin ; phenols ; silicon ; calcareous soil ; humic acid ; phosphorus uptake ; single superphosphate ; wheat ; animal feedstuff ; circular economy ; fertilizer ; greenhouse ; insect larva ; organic waste ; leafy vegetable ; mineral nutrients ; soil structure ; chlorophyll content ; cation exchange capacity ; nitrogen fertilizer ; nitrification inhibitor ; nitrogen leaching ; nitrogen use efficiency ; 3,4-dimethylpyrazole phosphate (DMPP) ; biochar ; compost ; isotopic signature ; carbon mineralization ; plant growth ; n/a ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFC Cultural studies::JFCV Food & society
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-12-21
    Description: Advances in nanotechnology have boosted the development of more efficient materials, with emerging sectors (electronics, energy, aerospace, etc.) demanding novel materials to fulfill the complex technical requirements of their products. This is the case of polymeric foams, which may display good structural properties alongside functional characteristics through a complex composition and (micro)structure in which a gas phase is combined with rigid ones, mainly based on nanoparticles, dispersed throughout the polymer matrix. In recent years, there has been an important impulse in the development of nanocomposite foams, extending the concept of nanocomposites to the field of cellular materials. This, alongside developments in new advanced foaming technologies which have allowed the generation of foams with micro, sub-micro, and even nanocellular structures, has extended the applications of more traditional foams in terms of weight reduction, damping, and thermal and/or acoustic insulation to novel possibilities, such as electromagnetic interference (EMI) shielding. This Special Issue, which consists of a total of 22 articles, including one review article written by research groups of experts in the field, considers recent research on novel polymer-based foams in all their aspects: design, composition, processing and fabrication, microstructure, characterization and analysis, applications and service behavior, recycling and reuse, etc.
    Keywords: T1-995 ; TP155-156 ; graphene oxide ; n/a ; microstructure ; multi-objective particle swarm optimization ; electromagnetic wave absorption ; polyamide ; lignin ; expandable microspheres ; surfactants ; aluminum microfibers ; biomaterials ; permittivity ; compression properties ; shock compression ; syntactic foams ; 1 ; impact wedge–peel test ; phenolic foams ; 3 ; foam extrusion ; energy conservation ; heat transfer ; heterogeneous nucleation ; polyurethane foam ; leaching test ; functional ; cellulose foam ; impact property ; foam injection molding ; itaconic acid ; composites ; foaming quality ; phosphorus flame retardants ; polymer waste ; metallic tube ; 5-benzene-trisamides ; polyurethane foam composites ; polyetherimide foams ; scCO2 ; Ethylene Propylene Diene Monomer ; thermal conductivity ; ethyl cellulose ; super critical CO2 ; thermal insulation ; cell nucleation ; crystalline ; polypropylene ; PZT ; burning characteristic ; foams ; quasi-static compression tests ; flame-retardant ABS microcellular foams ; nanotubes ; conductivity ; energy absorption capability ; intrinsic toughness ; ternary synergistic effect ; multilayers ; absorbent PMI foam ; semi-rigid polyurethane foams ; phosphorus ; EMI ; supramolecular additives ; MuCell® injection-molding foaming ; piezocomposite ; ultrasonication ; scCO2 foaming ; automobile structural adhesives ; thermogravimetric analysis ; rigid polyurethane foam ; failure mechanism ; mechanical properties ; multifunctional foams ; SANS ; fluoelastomer ; sound absorption coefficient ; acoustic performances ; functional foam ; foam morphology ; mechanical property ; polystyrene foams ; piezoelectric ; graphene ; Pluronic ; epoxy composite foam adhesive ; polymers ; flame retardancy ; core–shell rubber ; extrusion foaming ; equation of state ; cellulose nanofiber ; epoxy ; DOPO ; PUR ; grey relational analysis ; activation energies ; adjacent façade ; electrical conductivity ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 38
    ISSN: 1432-0789
    Keywords: Key words Phosphorus dynamics ; Olsen ; phosphorus ; Soil phosphorus fractions ; Manure ; Soybean-wheat rotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Soil P availability and efficiency of applied P may be improved through an understanding of soil P dynamics in relation to management practices in a cropping system. Our objectives in this study were to evaluate changes in plant-available (Olsen) P and in different inorganic P (Pi) and organic P (P0) fractions in soil as related to repeated additions of manure and fertilizer P under a soybean-wheat rotation. A field experiment on a Typic Haplustert was conducted from 1992 to 1995 wherein the annual treatments included four rates of fertilizer P (0, 11, 22 and 44 kg ha–1 applied to both soybean and wheat) in the absence and presence of 16 t ha–1 of manure (applied to soybean only). With regular application of fertilizer P to each crop the level of Olsen P increased significantly and linearly through the years in both manured and unmanured plots. The mean P balance required to raise Olsen P by 1 mg kg–1 was 17.9 kg ha–1 of fertilizer P in unmanured plots and 5.6 kg ha–1 of manure plus fertilizer P in manured plots. The relative sizes of labile [NaHCO3-extractable Pi (NaHCO3-Pi) and NaHCO3-extractable P0 (NaHCO3-P0)], moderately labile [NaOH-extractable Pi (NaOH-Pi) and NaOH-extractable P0 (NaOH-P0)] and stable [HCl-extractable P (HCl-P) and H2SO4/H2O2-extractable P (resisual-P)] P pools were in a 1 : 2.9 : 7.6 ratio. Application of fertilizer P and manure significantly increased NaHCO3-Pi and -P0 and NaOH-Pi, and -P0 fractions and also total P. However, HCl-P and residual-P were not affected. The changes in NaHCO3-Pi, NaOH-Pi and NaOH-P0 fractions were significantly correlated with the apparent P balance and were thought to represent biologically dynamic soil P and act as major sources and sinks of plant-available P.
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  • 39
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    Environmental geology 30 (1997), S. 224-230 
    ISSN: 1432-0495
    Keywords: Key words Sediment ; Washington ; DC ; Pollution ; phosphorus ; nutrients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Sediments in the rivers and basins around Washington, DC, have high concentrations of phosphorus, which, based on geographic distributions, is largely derived from urban runoff and municipal sewage. Dissolved-particulate phosphate exchange reactions and biological uptake of dissolved phosphorus from the water column may be an added source of phosphorus to the sediments. Concentrations of total sedimentary phosphorus ranged from 24 to 56 μm P/g-dw, and were highest in areas near combined sewer outfalls. As a part of this study, sedimentary phosphorus was fractionated into Fe-P, Ca-P, Al-P, and organic phases using a selective-sequential leaching procedure. The distribution of the phases in all sediments analyzed follow the order , Fe-P〉Ca-P〉Al-P. Spatial variations in the amounts of phosphorus in the different phases is related to the sources of phosphorus to the area. The proportions of occluded Al-P and organic P are 10–20% of the total P, respectively. This suggests that phosphorus from natural sources is small compared to anthropogenic inputs in this area. The high leachable Fe-P and Ca-P in these sediments might contribute a substantial amount of P to the water column under conditions of remobilization.
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  • 40
    ISSN: 1432-0495
    Keywords: Nitrogen ; phosphorus ; Precipitation collector ; Nutrients rates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The contribution of nitrogen and phosphorus due to precipitation constitutes the second most important route after superficial runoff. The sampling carried out during a two-year period by means of a precipitation collector allows us to determine the contribution of this route both qualitatively and quantitatively. Nitrogen is mainly supplied in an inorganic form, while phosphorus is principally supplied as orthophosphate. During the period of this study (March 1986–February 1988) it was found that in the Santillana Reservoir Watershed the level of nitrogen supplied by precipitation constitutes an average of 4.87% and the level of phosphorus constitutes 8.01%. The contribution of nitrogen varies in inverse ratio to precipitation and the contribution of phosphorus varies in direct ratio.
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  • 41
    ISSN: 1420-9055
    Keywords: sediments ; cyanobacteria ; Microcystis ; bacterial biomass ; bacterial production ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal variation of microbial biomass and activity in the surface sediments (0–10 cm) of the shallow, eutrophic Lake Vallentunasjön was followed during one year. “Overwintering”Microcystis colonies dominated the microbial community during all seasons, constituting 60–90% of the total microbial biomass. Expressed on an areal basis, the benthic biomass was, throughout the year, larger than or similar to the planktonic biomass during the peak of the summer bloom, indicating an ability of the colonies to survive in the sediments for extended periods. Abundance of “other”, non-photosynthetic bacteria varied in the range 3.0–15.5 · 1010 cells g−1 d. w. over the year with minimum values in summer and maximum values in autumn in connection with the sedimentation of theMicrocystis bloom. A substantial part of the non-photosynthetic bacteria, up to circa 40%, was associated with the mucilage of healthyMicrocystis colonies. Bacterial production (3H-thymidine incorporation) appeared to be strongly temperature dependent and less influenced by the seasonal sedimentation pattern. Our data indicate an increasing proportion of non-growing cells in autumn and winter. Biomass-bound phosphorus constituted a significant portion, circa 10%, of the phosphorus content in Lake Vallentunasjön sediments. This pool has normally been overlooked in studies on phosphorus dynamics in lake sediments. Different mechanisms whereby organic phosphorus can be released from the sediments are discussed.
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  • 42
    ISSN: 1420-9055
    Keywords: Particles ; phosphorus ; watersheds ; snow ; frost ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hydrological processes are known to have a considerable effect on nutrient transport from agricultural land to watercourses. In cold temperate regions peak discharges are caused not only by storm conditions but also by melting of snow and frost. The objective of this work was to investigate the effects of snow and frost melt on concentrations of phosphorus and suspended solids. The samples were taken using flowweighted automatic sampling techniques from two agricultural drainage basins. During the beginning of the snowmelt period the concentration of suspended solids was rather low by comparison with the total phosphorus concentration and the discharge. The different behaviour compared with the relationships found during storm conditions was probably caused by continuous extraction of the soil surface by low ionic concentration melt water, and to some extent by leaching from plant residues. The gradual decrease of total phosphorus concentration during the frost thawing period could be attributed to the gradually increasing proportion of the subsurface and ground water discharge in the runoff.
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  • 43
    ISSN: 1420-9055
    Keywords: Sediment ; interstitial water ; phosphorus ; iron ; persulfate digestion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is shown that sorption of orthophosphate to iron compounds, formed during persulfate digestion, can cause a significant underestimation of total dissolved phosphorus in interstitial waters rich in iron and poor in phosphorus. Labelling the samples with carrier free32PO4 before digestion allows to correct for these losses.
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  • 44
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    Aquatic sciences 53 (1991), S. 263-272 
    ISSN: 1420-9055
    Keywords: Lake ecosystem ; chl-a ; phosphorus ; nitrogen ; river flow ; thermocline ; simulation model ; multiple regression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The management variables which primarily affect phytoplankton biomass (as chl-a) in Lake Mjøsa, Norway, are total phosphorus loading (TP) and the timing and volume of water through flow (by active storage reservoirs). The response of the lake to changes in these factors is studied using a simulation model of the lake ecosystem. Chl-a responses from both observed data and the simulated results are extracted by multiple regression. Results show that decreasing TP load decreases chl-a, but less at low TP levels (〈 10 mg TP · m−3). There is also a certain time period for peak river flow which gives the least yield of chl-a per unit TP. This time period occurs in early summer (i.e., around June 10) if the total phosphorus load is low, and later if the load is high. Both observations and simulation results show that a high water flow increases chl-a at low epilimnion depths (〈 15 m), but that the same high water flow decreases chl-a when epilmnion is deep.
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  • 45
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    Aquatic sciences 52 (1990), S. 199-220 
    ISSN: 1420-9055
    Keywords: Eutrophication ; lake management ; phosphorus ; ecosystem ; chlorophyll-a ; mathematical modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compare results of a new model for predicting the short term inter annual changes in chlorophyll-a (chl-a) in lakes after reductions in total phosphorus (TP) to predictions made by least squares regression models. In the new method, slopes of chl-a/TP graphs (both axes in mg · m−3) are depicted in frequency diagrams and used to extract information on the expected, short term chl-a/TP response. The short term response for nine shallow (〈 10 m deep) and nutrient rich lakes to changes in TP was found to be: Chl-a = 0.49 · TP + 17.3, and for nine deep, P-limited lakes: Chl-a = 0.08 · TP + 3.5. If the TP-reduction is known to be greater than 10 mg · m−3, the expected slope increases to 0.58 for shallow lakes and to 0.26 for deep lakes. The slope, 0.58, is 8% lower than the slope for the long term response calculated by regression for the shallow lakes. For deep lakes the slope, 0.26, is 2 to 3 times higher than that calculated by regression, indicating that reductions in TP for deep lakes give greater effects than least squares regression equations suggest. We have also calculated the reduction in TP which will give about 80% probability that a reduction in chl-a will be observed next year. For shallow, P-limited lakes this reduction is about 30 mg · m−3 (5% of average initial in-lake TP concentration), and for deep lakes about 14 mg · m−3 (35% of average initial in-lake TP concentration).
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  • 46
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    Aquatic sciences 52 (1990), S. 256-268 
    ISSN: 1420-9055
    Keywords: Vertical mixing ; stratification ; phosphorus ; Lake Constance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Depth variable vertical eddy diffusion coefficients for heat (K z) were calculated from continuously measured temperature profiles in Überlinger See (western part of Lake Constance). The temperatures were averaged over vertical intervals of 10 m yielding 14 discrete values (maximum depth of Überlinger See: 147 m). A linear fit from 10 June to 29 September 1987 was used to smooth the significant temperature fluctuations caused by internal seiches of Lake Constance. Assuming horizontal homogeneity for the smoothed data the Gradient-Flux-Method was applied to compute vertical diffusion coefficientsK z at different depths using the depth variable volumes and surfaces of the 14 layers. The resulting mean diffusion coefficients for the period from June to September are 0.04 cm2/s near the thermocline and up to 0.8 cm2/s in deeper strata (accuracy: ± 50%). It is shown that horizontal mixing between Überlinger See and Obersee (main lake) alters the computation ofK z by less than 50%. A relationship betweenK z and stability (Brunt-Väisälä) frequencyN is found which corresponds well to the theory of internal wave induced turbulence. Combining the diffusion coefficients with measured phosphorus profiles, a phosphorus flux from the hypolimnion to the epilimnion of (0.7 ± 0.4) mg P m−2 d−1 was calculated, corresponding to about 20% of the average external loading per area of Lake Constance in 1986.
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  • 47
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    Aquatic sciences 54 (1992), S. 58-76 
    ISSN: 1420-9055
    Keywords: Eutrophication ; lake management ; phosphorus ; nitrogen ; chlorophyll-a ; slope estimator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We estimate the response of chl-a (mg · m−3) to changes in concentrations of total phosphorus (TP) by calculating the slopeS = Δchl-a/ΔTP in chl-a =f(TP) graphs. Results show that in years where algae are P-limited oligotrophic lakes respond less (median slope 0.21) to changes in nutrient concentrations than eutrophic lakes, (median slope 0.31) and these again less than hypereutrophic lakes, (median slope 1.02). We find no saturation value for the slope within the TP range considered (6–480 mg · m−3). Chl-a in eutrophic lakes responds more frequently to non-nutrient factors than oligotrophic and hypereutrophic lakes. Results obtained by replacing TP with a new nutrient parameter, TP′ = 0.056 · TP · IN0.226, in which inorganic nitrogen, IN, is factored in, suggest that nitrogen has an influence on chl-a in oligotrophic lakes. Blue-green algae respond less to changes in TP than other algal species, e.g., diatoms.
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  • 48
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    Aquatic sciences 54 (1992), S. 381-390 
    ISSN: 1420-9055
    Keywords: Eutrophication ; phosphorus ; lake restoration ; internal restoration measures for lakes ; Swiss lakes ; Lake Lugano (Lago di Lugano)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In most lakes eutrophication is linked to an excessive input of phosphorus. Lake restoration by reduction of P-input (external measure) has led to a considerable drop of the P-concentration in all major Swiss lakes as well as in many other lakes. Internal restoration measures such as artificial mixing, drainage of hypolimnetic water, flushing, aeration, biomanipulation and others serve to improve and accelerate the response of a lake to external measures. For the case of Lago di Lugano, a simple two-box model is employed to demonstrate that a reduction of the P-input to about 25% of the present values is necessary to reach the “P-criterion” (P-concentration below 30 µg/l). Internal measures could possibly accelerate the extremely slow response of the northern basin.
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  • 49
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    Aquatic sciences 55 (1993), S. 132-142 
    ISSN: 1420-9055
    Keywords: nitrogen ; phosphorus ; uptake ; regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissolved inorganic nutrient pools are small relative to particulate pools, and dissolved pools turnover rapidly. It has been observed that pools change little from day to day on the sampling scales usually employed. A simple model is presented where uptake and regeneration rates balance to cause a local steady state concentration for dissolved inorganic nutrients. Enrichment and dilution perturbation experiments with lake water support the idea of steady state nutrient concentrations. Although inorganic nutrient concentrations are often controlled by biota, the absolute concentrations present tell little about the activity of that biota.
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  • 50
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    Aquatic sciences 56 (1994), S. 16-28 
    ISSN: 1420-9055
    Keywords: Chlorophyll-a ; phosphorus ; nitrogen ; lake ecosystem ; nutrient limitation ; regression analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Regression results based on data from 46 northern temperate lakes show that total phosphorus (TP) is the best predictor for phytoplankton (as chl-a) at lower trophic levels, TP 〈 200 mg · m−3. A regression including both TP and TN as regressors is the best predictor for lakes with TP 〉 200 mg · m−3. However, the good correlation is probably due to a high correlation between lake average chl-a (all years observed) and lake average TP and TN. Within single hypereutrophic lakes, TN alone is the best predictor. It was not possible to identify a medium trophic domain where TN and TP in combination was the best predictor for chl-a. The ratio TN:TP in the water decreases from about 40 to about 5 with increasing trophic level. Optimum TN:TP ratio for algal species with high abundance during late summer and autumn reflects this decreasing ratio, but within a lesser range, i.e., 20 to 5. In contrast, TN:TP ratios for species abundant during the early vernal period showed no, or an inverse, relation to the TN:TP ratio of the water.
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  • 51
    ISSN: 1572-8854
    Keywords: Octahedral ; phosphorus ; chloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound [P(tpp)Cl2]+Cl− crystallizes in the space group P21/n witha=10.701(2),b=24.860(2),c=14.799(2), β=94.24(2)°,Z=4. The phosphorus atom has an octahedral coordination geometry formed by the four nitrogen atoms (Np) of the porphyrinato group and the two chloride ions. The average phosphorus-chloride distance is 2.150(1) Å, with phosphorus situated 0.006 Å below the porphyrin ring.
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  • 52
    ISSN: 1573-0417
    Keywords: diatoms ; eutrophication ; lake management ; paleolimnology ; British Columbia ; lakes ; phosphorus ; training sets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Eighteen lakes were added to a published training set of 46 British Columbia (BC) lakes in order to expand the original range of total phosphorus (TP) concentrations. Canonical correspondence analysis (CCA) was used to analyze the relationship between diatom assemblages and environmental variables. Specific conductivity and [TP] each explained significant (P≤0.05) directions of variance in the distribution of the diatoms. The relationship between diatom assemblages and [TP] was sufficiently strong to warrant the development of a weighted-averaging (WA) regression and calibration model that can be used to infer past trophic status from fossil diatom assemblages. The relationship between observed and inferred [TP] was not improved by the addition of more eutrophic lakes, however the [TP] range and the number of taxa used in the transfer function are now superior to the original model. Diatom species assemblages changed very little in lakes with TP concentrations greater than 85 µg 1−1, so we document the development of a model containing lakes with TP≤85 µg 1−1. The updated model uses 59 training lakes and covers a range of species optima from 6 to 41.9 µg 1−1 TP, and a total of 150 diatom taxa. The updated inference model provided a more realistic reconstruction of the anthropogenic history of a highly eutrophic BC lake. The model can now be used to infer past nutrient conditions in other BC lakes in order to assess changes in trophic status.
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  • 53
    ISSN: 1573-0417
    Keywords: carbon isotopes ; diatoms ; lake management ; nitrogen isotopes ; phosphorus ; radium-226 ; sediments ; trophic state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract We explored the use of carbon and nitrogen isotopes (δ13C and δ15N) in sedimented organic matter (OM) as proxy indicators of trophic state change in Florida lakes. Stable isotope data from four 210Pb-dated sediment cores were compared stratigraphically with established proxies for historical trophic state (diatom-inferred limnetic total phosphorus, sediment C/N ratio) and indicators of cultural disturbance (sediment total P and 226Ra activity). Diatom-based limnetic total P inferences indicate a transition from oligo-mesotrophy to meso-eutrophy in Clear Lake, and from eutrophy to hypereutrophy in Lakes Parker, Hollingsworth and Griffin. In cores from all four lakes, the carbon isotopic signature of accumulated OM generally tracks trophic state inferences and cultural impact assessments based on other variables. Oldest sediments in the records yield lower diatom-inferred total limnetic P concentrations and display relatively low δ13C values. In the Clear, Hollingsworth and Parker records, diatom-inferred nutrient concentrations increase after ca. AD 1900, and are associated stratigraphically with higher δ13C values in sediment OM. In the Lake Griffin core, both proxies display slight increases before ~1900, but highest values occur over the last ~100 years. As Lakes Clear, Hollingsworth and Parker became increasingly nutrient-enriched over the past century, the δ15N of sedimented organic matter decreased. This reflects, in part, the increasing relative contribution of nitrogen-fixing cyanobacteria to sedimented organic matter as primary productivity increased in these waterbodies. The Lake Griffin core displays a narrow range of both δ13C and δ15N values. Despite the complexity of carbon and nitrogen cycles in lakes, stratigraphic agreement between diatom-inferred changes in limnetic total P and the stable isotope signatures of sedimented OM suggests that δ13C and δ15N reflect shifts in historic lake trophic state.
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  • 54
    ISSN: 1573-0417
    Keywords: diatoms ; Everglades ; phosphorus ; wetland ; calibration ; multivariate ; Florida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The relationship between diatom taxa preserved in surface soils and environmental variables at 31 sites in Water Conservation Area 2A (WCA-2A) of the Florida Everglades was explored using multivariate analyses. Surface soils were collected along a phosphorus (P) gradient and analyzed for diatoms, total P, % nitrogen (N), %carbon (C), calcium (Ca), and biogenic silica (BSi). Phosphorus varied from 315-1781 μg g-1, and was not found to be correlated with the other geochemical variables. Canonical correspondence analysis (CCA) was used to examine which environmental variables correlated most closely with the distributions in diatom taxa. Canonical correspondence analysis with forward selection, constrained and partial CCA, and Monte Carlo permutation tests of significance show the most significant changes in diatom assemblages along the P gradient (p 〈 0.01), with additional species differences correlated with soil C, N, Ca, and BSi. Weighted-averaging (WA) regression and calibration models of diatom assemblages to P and BSi were developed. The diatom-based inference model for soil [P] had a high apparent r2 (0.86) with RMSEboot = 218 μg g-1. Indicator diatom species identified by assessing species WA optima and WA tolerance to [P], such as Nitzschia amphibia and N. palea for high [P] (~1300-1400 μ g-1) and Achnanthes minutissima var. scotica and Mastogloia smithii for low [P] (~400-600 μg g-1), may be useful as monitoring tools for eutrophication in WCA-2A as well as other areas of the Everglades. Diatom assemblages analyzed by cluster analysis were related to location within WCA-2A, and dominant taxa within clusters are discussed in relation to the geochemical variables measured as well as hydrology and pH. Diversity of diatom assemblages and a ‘Disturbance Index’ based on diatom data are discussed in relation to the historically P-limited Everglades ecosystem. Diatom assemblages should be very useful for reconstructions of [P] through time in the Florida Everglades, provided diatoms are well preserved in soil cores.
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  • 55
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    Mangroves and salt marshes 2 (1998), S. 37-42 
    ISSN: 1572-977X
    Keywords: mangrove ; phosphorus ; distribution ; dynamics ; exportation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and dynamics of phosphorus have been studied in the mangroves of Sepetiba Bay, Brazil. Leaf fall contributes 3.0 kg P ha=1yr=1to the sediment. The total above ground biomass of the R. mangle stand was about 65.3 t ha=1, the P accumulation was 3.9 kg P ha=1where 63% of the total P-biomass was accumulated in the leaves. The biomass of below ground roots was about 8.2 tha=1 and accumulated 16% of total P-biomass. Sediment contained 452 kg P ha=1 where P combined with calcium (P-Ca) was the main fraction (260 kg ha=1). The annual flux of P as litter fall was small (〈 1%) compared to total P in the sediment reservoir. The annual export of P by macrodetritus corresponds to 0.05% of the total sediment reservoir.
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  • 56
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    Biodegradation 14 (1991), S. 167-191 
    ISSN: 1572-9729
    Keywords: leaf longevity ; nitrogen ; nutrient use efficiency ; phosphorus ; requirement ; retranslocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Aboveground nitrogen (N) and phosphorus (P) requirement, retranslocation and use efficiency were determined for 28-year-old red oak (Quercus rubra L.), European larch (Larix decidua Miller), white pine (Pinus strobes L.), red pine (Pinus resinosa Ait.) and Norway spruce (Picea abies (L) Karst.) plantations on a similar soil in southwestern Wisconsin. Annual aboveground N and P requirements (kg/ha/yr) totaled 126 and 13 for red oak, 86 and 9 for European larch, 80 and 9 for white pine, 38 and 6 for red pine, and 81 and 13 for Norway spruce, respectively. Nitrogen and P retranslocation from current foliage ranged from 81 and 72%, respectively, for European larch, whereas red pine retranslocated the smallest amount of N (13%) and Norway spruce retranslocated the smallest amount of P (18%). In three evergreen species, uptake accounted for 72 to 74% of annual N requirement whereas for two deciduous species retranslocation accounted for 76 to 77% of the annual N requirement. Nitrogen and P use (ANPP/uptake) was more efficient in deciduous species than evergreen species. The results from this common garden experiment demonstrate that differences in N and P cycling among species may result from intrinsic characteristics (e.g. leaf longevity) rather than environmental conditions.
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  • 57
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    Landscape ecology 15 (2000), S. 187-199 
    ISSN: 1572-9761
    Keywords: BOD5 ; catchment ; empirical model ; land use change ; land use scenarios ; nitrogen ; phosphorus ; runoff ; SO4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Due largely to unprecedented land-use changes in the Porijõgi River catchment (southern Estonia) losses of nutrients and organic matter have decreased significantly. During the period 1987–1997 abandoned lands increased from 1.7 to 10.5% and arable lands decreased from 41.8 to 23.9%. At the same time, the runoff of total-N, total-P, SO4 and organic matter (after BOD5) decreased from 25.9 to 5.1, 0.32 to 0.13, 78 to 48, and 7.4 to 3.5 kg ha−1 yr−1, respectively. The most significant decreases occurred in agricultural subcatchments while the changes were insignificant in the forested upper course catchment. A simple empirical model which incorporates land-use pattern, fertilization intensity, soil parameters and water discharge accurately described the variations of total-N and total-P runoff in both the whole catchment and its agricultural subcatchments (R 2 varies from 0.95–0.99 for N to 0.49–0.93 for P). In small agricultural subcatchments the rate of fertilization is found the most important factor for nitrogen runoff, whereas in larger mosaic watersheds land use pattern plays the main role. Seven alternative scenarios compiled on the base of the empirical model allow to forecast potential nitrogen and phosphorus losses from the catchment. This information can be used in further landscape and regional planning of the whole region.
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  • 58
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    Human ecology 13 (1985), S. 209-240 
    ISSN: 1572-9915
    Keywords: catchment-ecosystem ; nutrient-budget ; anthropogenic inputs ; nitrogen ; phosphorus ; eutrophication ; agricultural policies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract The catchment-ecosystem concept is adapted to investigate the nutrient-budget of the highly-modified Colebrooke drainage basin in Northern Ireland. Anthropogenic inputs, mainly manures and fertilizers, account for 86% of the nitrogen and 96% of the phosphorus added to the catchment. These inputs greatly exceed the streamflow outputs, thereby indicating that the flow of nutrients is dominated by agriculture. This is explained by the transformation of traditional mixed farming into more intensive livestock production and is linked to policies encouraging increased agricultural production, amalgamation of farms, afforestation, rural depopulation, and urbanization. Substantial increases in the Nand Poutput of the catchment and further eutrophication of the recipient lake, Lough Erne, are predicted without the implementation of policies to reduce agricultural nutrient losses.
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  • 59
    ISSN: 1572-9680
    Keywords: Imperata cylindrica ; Mucuna pruriens ; phosphorus ; soil organic matter ; Sumatra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Imperata cylindrica grasslands are widely believed to indicate poor soil fertility. Soil fertility improvement may have to be an important component of a reclamation strategy. Data for Sumatra, Indonesia indicate, however, that Imperata occurs on a broad range of soil types and is not confined to the poorest soils. A direct role of Imperata in soil degradation cannot be ascertained. In many instances, however, Imperata soils are low in available P and effective N supply. The use of rock phosphate in combination with erosion control (‘fertility traps’) and legume cover crops can be effective in restoring soil fertility. Case studies for a number of sites in Sumatra have confirmed the practical possibility of reclaiming grasslands for food and tree crops.
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  • 60
    ISSN: 1572-9680
    Keywords: biomass transfer ; integrated nutrient management ; nitrogen ; nutrient cycling ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Tithonia diversifolia, a shrub in the family Asteraceae, is widely distributed along farm boundaries in the humid and subhumid tropics of Africa. Green biomass of tithonia has been recognized as an effective source of nutrients for lowland rice (Oryza sativa) in Asia and more recently for maize (Zea mays) and vegetables in eastern and southern Africa. This paper reviews the potential of tithonia green biomass for soil fertility improvement based on recent research in western Kenya. Green leaf biomass of tithonia is high in nutrients, averaging about 3.5% N, 0.37% P and 4.1% K on a dry matter basis. Boundary hedges of sole tithonia can produce about 1 kg biomass (tender stems + leaves) m−1 yr−1 on a dry weight basis. Tithonia biomass decomposes rapidly after application to soil, and incorporated biomass can be an effective source of N, P and K for crops. In some cases, maize yields were even higher with incorporation of tithonia biomass than with commercial mineral fertilizer at equivalent rates of N, P and K. In addition to providing nutrients, tithonia incorporated at 5 t dry matter ha−1 can reduce P sorption and increase soil microbial biomass. Because of high labor requirements for cutting and carrying the biomass to fields, the use of tithonia biomass as a nutrient source is more profitable with high-value crops such as vegetables than with relatively low-valued maize. The transfer of tithonia biomass to fields constitutes the redistribution of nutrients within the landscape rather than a net input of nutrients. External inputs of nutrients would eventually be required to sustain production of tithonia when biomass is continually cut and transferred to agricultural land.
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  • 61
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    Agroforestry systems 8 (1989), S. 257-265 
    ISSN: 1572-9680
    Keywords: Nitrogen ; phosphorus ; potassium ; rooting density ; root biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nutrient competition between interplanted species is investigated using mechanistic modelling. Though tree and crop plant roots may occupy the same soil volume, nutrient competition is seen to be dependent on soil supply mechanisms. Model simulations illustrate the effects of nutrient diffusion rate, mobility/soil interaction, root diameter, soil moisture content, and rooting density on nutrient concentration gradients governing uptake adjacent to plant roots. These factors, unique for each nutrient and soil, combine to determine the potential for competition in agroforestry plantings. Nutrient competition is most likely for the more mobile nutrients and mechanistic modelling can be used to select tree and crop species with superior rooting and physiological characteristics for interplantings to better manage below-ground competition.
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  • 62
    ISSN: 1572-9680
    Keywords: Theobroma cacao ; shade trees ; Erythrina poeppigiana ; Cordia alliodora ; modelling ; organic matter ; nitrogen ; phosphorus ; potassium ; calcium ; magnesium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Models for cycles for organic matter and nutrients element (N, P, K, Ca and Mg) are presented for the agroforestry systems of cacao (Theobroma cacao) withCordia alliodora orErythrina poeppigiana in Turrialba, Costa Rica. For the models, system reserves (soil, humus, vegetation divided into leaves, branches, stems, fine roots, fruits) and transference between compartments (production and decomposition of litter residues) inputs (fertilizer, rainfall) and outputs (harvests) of the system are considered. The implications of the models are discussed in detail. Aspects of net primary production in the systems studied are considered. N fixation is calculated on the basis of balances. Analysis of soil water showed high variations that coincided with rainfall patterns and pruning of theE. poeppigiana.
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  • 63
    ISSN: 1573-0417
    Keywords: Great Basin ; climatic variations ; productivity ; organic matter ; nitrogen ; phosphorus ; hardwater lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Sediment cores from the shallow and deep basins of Pyramid Lake, Nevada, revealed variations in composition with depth reflecting changes in lake level, river inflow, and lake productivity. Recent sediments from the period of historical record indicate: (1) CaCO3 and organic content of sediment in the shallow basin decrease at lower lake level, (2) CaCO3 content of deep basin sediments increases when lake level decreases rapidly, and (3) the inorganic P content of sediments increases with decreasing lake volume. Variations in sediment composition also indicate several periods for which productivity in Pyramid Lake may have been elevated over the past 1000 years. Our data provide strong evidence for increased productivity during the first half of the 20th Century, although the typical pattern for cultural eutrophication was not observed. The organic content of sediments also suggests periods of increased productivity in the lake prior to the discovery and development of the region by white settlers. Indeed, a broad peak in organic fractions during the 1800's originates as an increase starting around 1600. However, periods of changing organic content of sediments also correspond to periods when inflow to the lake was probably at extremes (e.g. drought or flood) indicating that fluctuations in river inflow may be an important factor affecting sediment composition in Pyramid Lake.
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  • 64
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    Journal of paleolimnology 20 (1998), S. 47-55 
    ISSN: 1573-0417
    Keywords: diatoms ; spatial variability ; canonical correspondence analysis ; lake eutrophication ; transfer functions ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Diatom analyses were undertaken of sediment cores covering a range of water depths in a small eutrophic lake (Lough Augher, Co. Tyrone, N. Ireland). The significance of between-core variability in diatom relative frequency stratigraphy was assessed by Canonical Correspondence Analysis (CCA) where the ordination axes were constrained to external environmental variables (sediment depth, core location coordinates, water depth, effective fetch, distance-from-shore and distance-from-inflow). After the removal of the effect of sediment age by partialling it out, the resultant first two axes from the partial-CCA were significantly correlated with water depth and distance-from-shore, indicating non-uniform diatom stratigraphies across the lake. Despite this variability, all cores show the same succession of species and, therefore, record the eutrophication of the lake. Diatom-inferred total phosphorus (DI-TP) was inferred for six cores using weighted averaging regression and calibration. Apart from considerable differences of DI-TP in surficial sediment samples, there was good between-core repeatability of DI-TP profiles. These data support the use of DI-TP for establishing background nutrient concentrations for lakes, and associated implications for lake restoration schemes using single cores. Comparisons of DI-TP profiles and total diatom accumulation rate data for the individual cores indicate that diatom production peaked prior to the maximum TP concentrations in the lake.
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  • 65
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    Journal of paleolimnology 20 (1998), S. 31-46 
    ISSN: 1573-0417
    Keywords: phosphorus ; Lake Okeechobee ; lead-210 dating ; eutrophication ; phosphorus loading
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Phosphorus accumulation rates in depositional zone sediments of Lake Okeechobee were determined in 11 mud-zone cores and two peat-zone cores dated by 210Pb. Although difficulties were encountered in interpreting 210Pb data from some sites, reliable dating of sediments from the mud zone of this shallow lake is possible. Sediment accumulation rates in this zone have increased during the present century by an average of about twofold, and accumulation of organic sediments in the lake during pre-settlement times apparently was much slower than during the past century. Concentrations of all forms of sedimentary P but especially nonapatite inorganic-P and organic-P also have increased since pre-settlement times and especially since about 1940. Annual P accumulation rates in the lake's sediments have increased about fourfold during the 1900s, with most of the increase occurring in the past 40–50 years. The recent accumulation rate of sedimentary P (past ~ 10 years) agrees within a factor of 1.5 with the net retention of P in the lake calculated from published input-output mass balances.
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  • 66
    ISSN: 1572-879X
    Keywords: selective catalytic reduction ; nitric oxide reduction ; phosphorus ; acid property
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To examine the influence of phosphorus on the commercial V2O5(WO3)/TiO2 SCR catalyst, measurements were carried out by means of infrared and Raman spectroscopy, XPS, and NO reduction measurement as a function of phosphorus loading. Phosphorus added to the catalyst was found to disperse well over the catalyst without a significant agglomeration up to 5 wt% P2O5 addition. The number of the hydroxyl groups bonded to the vanadium and titanium species decreased readily with increasing amount of phosphorus. Correspondingly, the hydroxyl groups bonded to the phosphorus species were formed. NH3 adsorbed on both hydroxyl groups bonded to vanadium and phosphorus as ammonium ions, implying that the P–OH groups formed are also responsible for the Brønsted acidity. The NO reduction activity was found to be decreased with increasing amount of phosphorus; however, the influence of phosphorus was relatively small irrespective of the large amount of phosphorus addition. The deactivation might be caused by the change in the nature of the surface hydroxyl groups as Brønsted acid sites. Phosphorus species might partially wrap the surface V=O and W=O groups, which might also contribute to the deactivation.
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  • 67
    ISSN: 1572-9028
    Keywords: ethane ; vanadium ; molybdenum ; phosphorus ; titanium oxide ; acetic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Different complementary physicochemical tools have been used to explain the improvement of the catalytic performances for ethane oxidation into acetic acid induced by the addition of molybdenum as phosphate to vanadium phosphate deposited on TiO2-anatase, at a coverage below the monolayer. Electron microscopy techniques have shown that the elements are dispersed on the support. Electron spin resonance, laser Raman and UV-visible spectroscopies have evidenced that the short range order around vanadium is modified by the presence of molybdenum. 51V NMR has shown that molybdenum favours the octahedral symmetry of vanadium. The acidic properties of the catalyst are improved by the adding effect of molybdenum and by the addition of water. This should explain a better desorption of acetic acid and the improvement of the corresponding yield. This confirms the importance of the atomic environment of vanadium-based oxides to control the mild oxidation of light alkanes.
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  • 68
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    Plant foods for human nutrition 42 (1992), S. 313-318 
    ISSN: 1573-9104
    Keywords: Iron availability ; phosphorus ; soil iron level ; ascorbic acid ; oxalic acid ; spinach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In vitro availability of iron along with ascorbic acid, oxalic acid and phosphorus content of two varieties of spinach (Pusa Jyoti and Allgreen) cultivated in soil with different levels of added iron was determined. Addition of graded levels of iron to soil markedly increased the total iron and phosphorus contents and significantly decreased the bio-availability of iron, ascorbic acid and oxalic acid contents of spinach. Ascorbic acid and oxalic acid contents markedly exerted a positive influence while phosphorus exerted a negative influence on the bio-availability of iron.
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  • 69
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    International journal of salt lake research 3 (1994), S. 159-173 
    ISSN: 1573-8590
    Keywords: phosphorus ; orthophosphate ; phosphomolybdenum blue ; salt effect ; hypersaline ; saline ; lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract Standard methods for the determination of phosphorus as phosphate ion are now well established for fresh and marine waters. In highly saline waters, however, salt effects due to ionic strength, or to particular ions present, may result in method interferences. Three methods of analysis of phosphate based on the formation of phosphomolybdenum blue complexes have been evaluated here for hypersaline waters. Stannous chloride reduction in aqueous media exhibits a substantial salt effect and its use is not recommended. Stannous chloride reduction following extraction into non aqueous solvents shows a significant salt effect (up to 30 per cent) in solutions of salinity 〉100 g L−1. Dilution of hypersaline waters to below this salinity may overcome the salt effect but the method suffers from other disadvantages involving resource constraints and health and safety considerations. Ascorbic acid reduction, catalysed by antimony (III) ions, appears to offer the most promise for hypersaline waters. Turbidity in samples having high salinity (〉 100 g L−1) and high phosphorus concentrations (〉 500 μg P L−1) changes the spectral characteristics of solutions but linear calibration curves still result for concentrations in the range 400 to 1,000 μg P L−1. The occurrence of turbidity is also affected by the ionic composition of hypersaline waters since solutions made from sea salt give different results to those made from sodium chloride. Dilution of samples, to give salinities less than 100 g L−1 prior to reduction is recommended to avoid turbidity. The salt effect in these lower salinity waters is less than 3 per cent up to 100 g L−1.
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  • 70
    ISSN: 1573-8264
    Keywords: alfalfa ; arbuscular mycorrhizal fungi ; nitrogen ; nitrogen-fixing bacteria ; phosphorus ; plant growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this research was to carry out a critical study of the method of obtaining size equivalence between non-symbiotic alfalfa and alfalfa associated with Glomus and/or Rhizobium by applying fixed addition rates of nutrients to the non-symbiotic controls. The experimental design included three nutrient response curves in which the levels of added phosphorus and/or nitrogen were constant during the whole plant growth process: 1) a phosphorus response curve, in order to compare the growth of double symbiotic plants with that of only-Rhizobium inoculated ones; 2) a nitrogen response curve, that consisted of a comparison between the growth of double symbiotic alfalfa and four treatments associated only with Glomus; 3) a phosphorus and nitrogen response curve, to compare the growth of non-inoculated alfalfa with that of double symbiotic plants. Although similar size was achieved among some treatments at harvest, shoot growth over time and nutrient concentrations in tissues differed, indicating that growth equivalence did not mean functional equivalence. A second experimental design was performed taking into account the establishment of microsymbionts for determining the adequate moment to add supplemental phosphorus and/or nitrogen. It included four treatments: a) double symbiotic plants (MR); b) plants inoculated with Rhizobium only (R); c) plants inoculated with Glomus only (M), and d) non-inoculated plants (N). Great similarity in terms of plant growth and nutrient contents in tissues were obtained. Moreover, symbiotic plants were able to produce similar dry matter than non-symbiotic ones under P and N limitations.
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  • 71
    ISSN: 1573-8264
    Keywords: bacterial isolates ; grasses ; mycorrhizal colonization ; nitrogen ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The inoculation of mycorrhizal maize plants with three isolates of microaerophilic diazotrophic bacteria obtained from the mycelium of arbuscular mycorrhizal fungi associated with three grasses (Arrhenatherum elatius - bacterial isolate ARR, Agropyrum repens - isolate AGR and Poa annua - isolate POA) caused no increase in nitrogen content in plant biomass. The inoculation with bacterial isolate ARR resulted in the decreased plant growth. Bacterial isolate AGR decreased the percentage of the root length colonized by arbuscular mycorrhizal fungus Glomus fistulosum. The inoculation with both mycorrhizal fungus and isolate POA increased significantly the concentration of phosphorus in plant shoots compared to uninoculated control.
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  • 72
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    European journal of plant pathology 105 (1999), S. 61-76 
    ISSN: 1573-8469
    Keywords: core sampling ; foliar nutrient concentrations ; minirhizotrons ; nitrogen ; phosphorus ; potassium ; Rhizolab
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Potato-cyst nematodes (Globodera pallida) cause severe yield losses in potato. Plants infected with potato-cyst nematodes generally have reduced concentrations of nitrogen, phosphorus and potassium in the foliage. This study investigated whether reduced growth of nematode-infected potato is caused by nutrient limitation. Experiments in the field and in containers showed that phosphorus concentration correlated best with total crop biomass at early stages of growth. The role of phosphorus in nematode damage was further investigated in the field and in the Wageningen Rhizolab. The experimental field was infested with potato-cyst nematodes and two levels of nematode density were established by fumigation with a nematicide. Prior applications of calcium carbonate resulted in pHKCl levels of 4.8 and 6.1. Two levels of phosphorus fertiliser were applied: either 0 or 225 kg P ha−1. In the Wageningen Rhizolab, soil of both pH levels from the field was used after treatment with 1 MRad gamma irradiation to kill the nematodes. Subsequently, half of the soil was inoculated with cysts to give a nematode density of 30 viable juveniles per gram of soil. In the field, nine weeks after planting, the total crop biomass ranged from 107 g m−2 for the treatment with nematodes at pHKCl 6.1 without phosphorus fertiliser to 289 g m−2 for the fumigated treatment at pHKCl 4.8 with phosphorus fertiliser. The differences in total biomass for the various treatments were explained by differences in foliar phosphorus concentration. Nematodes induced or aggravated P deficiency and reduced total biomass. This was not the only damage mechanism as at high, non-limiting levels of foliar phosphorus concentration, nematodes still reduced total biomass. In the Wageningen Rhizolab, directly after planting, the number of roots visible against minirhizotrons was reduced by nematodes. However, the increase of root number in the nematode treatment continued longer than in the control, until root number was higher than that of the control. The compensary root growth of the nematode treatment was restricted to the top 30 cm and nematodes reduced rooting depth. High soil pH reduced growth, mainly by reducing the availability of phosphate. Both nematodes and high soil pH reduced nutrient uptake per unit root length. Our results lead us to suggest an interaction between nematodes and soil pH, with nematode damage being higher at pHKCl 6.1 than at pHKCl 4.8.
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  • 73
    ISSN: 1573-515X
    Keywords: estuaries ; lakes ; marine ; nitrogen ; phosphorus ; rivers ; streams ; temperate ; tropics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Published data and analyses from temperate and tropical aquatic systems are used to summarize knowledge about the potential impact of land-use alteration on the nitrogen biogeochemistry of tropical aquatic ecosystems, identify important patterns and recommend key needs for research. The tropical N-cycle is traced from pre-disturbance conditions through the phases of disturbance, highlighting major differences between tropical and temperate systems that might influence development strategies in the tropics. Analyses suggest that tropical freshwaters are more frequently N-limited than temperate zones, while tropical marine systems may show more frequent P limitation. These analyses indicate that disturbances to pristine tropical lands will lead to greatly increased primary production in freshwaters and large changes in tropical freshwater communities. Increased freshwater nutrient flux will also lead to an expansion of the high production, N- and light-limited zones around river deltas, a switch from P- to N-limitation in calcareous marine systems, with large changes in the community composition of fragile mangrove and reef systems. Key information gaps are highlighted, including data on mechanisms of nutrient transport and atmospheric deposition in the tropics, nutrient and material retention capacities of tropical impoundments, and N/P coupling and stoichiometric impacts of nutrient supplies on tropical aquatic communities. The current base of biogeochemical data suggests that alterations in the N-cycle will have greater impacts on tropical aquatic ecosystems than those already observed in the temperate zone.
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  • 74
    ISSN: 1573-515X
    Keywords: acidification ; anthropogenic nitrogen ; cations ; nitrate leaching ; nitric oxide ; nitrous oxide ; nutrient limitation ; phosphorus ; productivity ; tropical ecosystems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Human activities have more than doubled the inputs of nitrogen (N) into terrestrial systems globally. The sources and distribution of anthropogenic N, including N fertilization and N fixed during fossil fuel combustion, are rapidly shifting from the temperate zone to a more global distribution. The consequences of anthropogenic N deposition for ecosystem processes and N losses have been studied primarily in N-limited ecosystems in the temperate zone; there is reason to expect that tropical ecosystems, where plant growth is most often limited by some other resource, will respond differently to increasing deposition. In this paper, we assess the likely direct and indirect effects of increasing anthropogenic N inputs on tropical ecosytem processes. We conclude that anthropogenic inputs of N into tropical forests are unlikely to increase productivity and may even decrease it due to indirect effects on acidity and the availability of phosphorus and cations. We also suggest that the direct effects of anthropogenic N deposition on N cycling processes will lead to increased fluxes at the soil-water and soil-air interfaces, with little or no lag in response time. Finally, we discuss the uncertainties inherent in this analysis, and outline future research that is needed to address those uncertainties.
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  • 75
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    Biogeochemistry 46 (1999), S. 179-202 
    ISSN: 1573-515X
    Keywords: carbon dioxide ; grazing ; nitrogen fixation ; nitrogen limitation ; phosphorus ; shade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The widespread occurrence of N limitation to net primary production (NPP) and other ecosystem processes, despite the ubiquitous occurrence of N-fixing symbioses, remains a significant puzzle in terrestrial ecology. We describe a simple simulation model for an ecosystem containing a generic nonfixer and a symbiotic N fixer, based on: (1) a higher cost for N acquisition by N fixers than nonfixers; (2) growth of fixers and fixation of N only when low N availability limits the growth of nonfixers, and other resources are available; and (3) losses of fixed N from the system only when the quantity of available N exceeds plant and microbial demands. Despite the disadvantages faced by the N fixer under these conditions, N fixation and loss adjust N availability close to the availability of other resources, and biomass and NPP in this simple model can be substantially but only transiently N limited. We then modify the model by adding: (1) losses of N in forms other than excess available N (e.g., dissolved organic N, trace gases produced by nitrification); and (2) constraints to the growth and activity of N fixers imposed by differential effects of shading, P limitation, and grazing. The combination of these processes is sufficient to describe an open system, with input from both precipitation and N fixation, that is nevertheless strongly N-limited at equilibrium. This model is useful for exploring causes and consequences of constraints to N fixation, and hence of N limitation, and we believe it will also be useful for evaluating how N fixation and limitation interact with elevated CO2 and other components of global enviromental change.
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  • 76
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    Biogeochemistry 47 (1999), S. 25-38 
    ISSN: 1573-515X
    Keywords: Hedley fractionation ; phosphorus ; Ruttenberg fractionation ; soil phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract We used l6 soils to compare the Hedley method for soil phosphorus fractionation to an alternative method recently developed by Ruttenberg to differentiate among P fractions in marine sediments. For forms of labile and Fe-bound P in soils, these methods were poorly correlated, with the Hedley fractionation showing a greater ability to discriminate among variations in plant-available P. For Ca-bound P, total organic P, and total P, the methods were well correlated (r2 = 0.93, 0.48, 0.74, respectively), although the sum of P measured in the Ruttenberg extractions is only 45% of the total P recovered by the Hedley fractionation. The Hedley fractionation seems superior when an index of plant-available phosphorus and a separation of organic and inorganic forms is needed, whereas the Ruttenberg method allows a separation of CaCO3-bound P from apatite-P, which is potentially useful in calcareous soils.
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  • 77
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    Bulletin of experimental biology and medicine 101 (1986), S. 135-138 
    ISSN: 1573-8221
    Keywords: phosphorus ; oral mucosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 78
    ISSN: 1573-5117
    Keywords: blue-green algae ; recruitment ; sediment ; phosphorus ; alum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sediment-to-water recruitment of blue-green algae was investigated in a shallow lake following treatment with aluminum sulfate and sodium aluminate to control sediment phosphorus (P) release. A comparison of results from two summers each before and after treatment indicates that the treatment did not universally impact the recruitment of either sporulating or non-sporulating forms of blue-green algae. Blooms of Anabaena, Aphanizomenon, and Coelosphaerium resulted predominantly from growth in the water column following strong recruitment episodes lasting up to two weeks, while Microcystis populations were relatively insensitive to periodically high inputs from recruitment. The development of planktonic populations of Gloeotrichia echinulata, by contrast, were largely dependent on sustained recruitment in response to adequate light and temperature regimes at the sediment surface. The cellular P content of recruited G. echinulata colonies was unaffected by the accumulation of aluminum floc to the lake sediments. Both G. echinulata and C. naegelianum showed elevated levels of cellular P in newly recruited colonies as compared to planktonic colonies, indicating P transport from the sediments to the water column. Total P translocation by blue-green algae was negligible in the absence of a substantial recruitment of G. echinulata. The recruitment of G. echinulata, and hence the magnitude of P translocation, was therefore more responsive to environmental conditions prevalent at the sediments than to direct effects of the treatment itself.
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  • 79
    ISSN: 1573-5117
    Keywords: river ; hyporheic ; dissolved organic carbon ; nitrogen ; phosphorus ; silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Solute, nutrient and bacterial inputs to the River Rhône from the interstitial habitat of a gravel bar and the floodplain aquifer were investigated during an artificial drought. Eight springs were investigated: four groundwater-fed springs in the floodplain, located at the bottom of the bank; and four interstitial-fed springs located at the downstream end of a gravel bar. During this period, the inflows of groundwater to the river represented an average input of 0.77 mg l−1 of nitrogen (of which 93.3% were nitrates), 0.0187 mg l−1 of total phosphorus (of which 42.2% was orthophosphate), 3.56 mg l−1 of silica, 2.315 ± 0.703 mg l−1 of dissolved organic carbon (DOC, of which 47% was biodegradable) and 7.3 × 104 ± 3.7 × 104 bacteria per ml (of which 8.8% were active). Silica, DOC, biodegradable DOC, and bacteria concentrations displayed temporal variations during the study, which seem to be linked to the biological activity of the groundwater biofilm. There was a strong heterogeneity between the two types of groundwater that flow to the river: concentrations of calcium and alkalinity were higher in bank springs than in gravel bars springs. In these latters, sulfate, sodium, nitrogen, phosphorus were significantly higher.
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  • 80
    ISSN: 1573-5036
    Keywords: calcareous soil ; chemical inactivation ; copper ; iron chlorosis ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Results of a field trial designed to study the effects of soil-applied phosphorus and copper on the incidence of iron chlorosis in garden peas showed that there were significant reductions in chlorophyll content and peroxidase activity in leaves of plants treated with phosphorus and copper. However, foliar spray of Fe-EDDHA, a stable iron chelate, had no effects on these parameters. Green pod yield of peas was also found significantly reduced with phosphorus and copper applications. But Fe-EDDHA caused significant increase in pod yield. It is suggested that excess of P and Cu in leaves interfere with metabolic translocation of iron and render Fe inactive for chlorophyll synthesis.
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  • 81
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    Plant and soil 109 (1988), S. 171-179 
    ISSN: 1573-5036
    Keywords: Black Solod ; inflow ; magnesium ; nitrogen ; phosphorus ; potassium ; root efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field study with barley was conducted in 1984 and 1985 to provide data on uptake rates of N, P, K and Mg and their variation as the growing season progressed. Two varieties were grown: Galt in 1984 and Otal in 1985. Soil fertility was maintained at or near optimum conditions. Samples were obtained approximately every 10 days for shoot dry weight, nutrient content and root length measurements. The approximate method (Williams, 1948) traditionally used for calculating uptake rates was found to be invalid for most of the nutrients studied. The method used for measuring uptake rates was the functional approach proposed by Hunt (1973). Inflow,i.e. uptake rate per unit root length, of plant nutrients, decreased with time. However, maximum uptake rates measured in kg ha−1d−1 occurred at about 50 days from sowing because of increasing root length density with time. Inflow or uptake rates were low in 1985 because of moisture deficiency, and grain yield (0.89 t ha−1) was severely depressed. This study demonstrated that Hunt's method is superior and more advantageous than the traditional, approximate method.
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  • 82
    ISSN: 1573-5036
    Keywords: copper ; Glomus aggregatum ; phosphorus ; Tropeptic Eutrustox ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Response ofLeucaena leucocephala (Lam) de Wit to rock phosphate application and inoculation with the vesicular-arbuscular mycorrhizal (VAM) fungusGlomus aggregatum (Schenck and Smith emend Koske) was evaluated in a pot experiment. VAM colonization increased as rock phosphate application increased. Using phosphorus concentration in pinnules as an indicator of VAM activity, significant VAM activity occurred at 25 days after planting at the lower levels of rock phosphate application (0, 0.34 and 0.68 g P kg−1). The time required for significant VAM activity was shortened by 5 days at the higher P levels (1.36, 2.72 and 5.44 g P kg−1). The highest VAM activity was associated with the highest rate of rock phosphate application. Inoculation withG. aggregatum significantly increased the uptake of Cu, P and Zn and dry-matter yield at all levels of rock phosphate applied. Copper concentrations in roots of mycorrhizal Leucaena were significantly higher than that of shoots. The results indicated that Leucaena in symbiotic association with VAM fungi effectively utilized P from rock phosphate. However, high rates of rock phosphate are required to attain growth comparable to that obtained with the application of water-soluble phosphate.
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  • 83
    ISSN: 1573-5117
    Keywords: nitrogen ; phosphorus ; chlorophyll ; organic matter ; mountain lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Concentrations of total phosphorus (TP), inorganic and organic nitrogen, organic matter, and chlorophyll-a were studied in ten mountain lakes at various stages of acidification, trophy, and type of watershed during each July and October from 1987 to 1990. Concentrations of TP and total organic matter were higher in July than in October. Concentrations of NH44 +-N decreased and NO3 −-N increased from July to October. The relative composition of total nitrogen (TN) and its concentration were strongly dependent on the type of watershed: the lowest TN concentrations were observed in lakes with forested watersheds, increasing above the timberline and reaching maximum values in acidified lakes with rocky watersheds. In the pool of TN, nitrate was most important in lakes above the timberline (70–86% of TN), and organic nitrogen in forest lakes (〉 90% of TN). Lakes with rocky watersheds were characterized by high ratios of TN:TP (〉 250 by mass). The concentration of chlorophyll-a varied widely, from 0.01 to 22.6 µg l−1, without any consistent change between July and October, and were P limited.
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  • 84
    ISSN: 1573-5117
    Keywords: phytoplankton ; zooplankton ; phosphorus ; aquatic mesocosms ; trophic interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eight cylindrical enclosures (3 m diameter, 2.7 m long, V = 20m3) were installed in eutrophic Rice Lake (Ontario, Canada) in late spring of 1987. Fish (yearling yellow perch (Perca flavescens) and macrophytes (Potamogeton crispus) presence and absence were set at the beginning of the experiment to yield four combinations of duplicate treatments. The purpose of the experiment was to determine if the phytoplankton, zooplankton, macrophytes and fish species resident in the lake interact to influence water quality (major ions, phosphorus, algal densities and water clarity). The presence of fish was associated with: (1) decreased biomass of total zooplankton, (2) decreased number of species in the zooplankton, (3) decreased average size of several zooplankton taxa, (4) higher total phosphorus concentrations, (5) higher phytoplankton and chlorophyll a concentrations, (6) lower water clarity, (7) lower potassium levels during macrophyte die-back, (8) lower pH and higher conductivity in the presence of macrophytes. Biomass of large Daphnia species (but not total zooplankton) was highly correlated with the algal response (r 2 = 0.995) and was associated with reduced biomass of several algal taxa including some large forms (Mougeotia, Oedogonium) and several colonial blue-green algae. However, no significant control of late summer growth of the bloom-forming blue-green alga Anabaena planctonica Brun. was achieved by the Daphnia presence-fish absence treatment. Release of phosphorus to the water column during the die-back of P. crispus was not an important phenomenon.
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  • 85
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    Hydrobiologia 295 (1995), S. 311-321 
    ISSN: 1573-5117
    Keywords: mangrove forest ; nitrogen ; nutrient budgets ; phosphorus ; shrimp pond effluent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Preliminary estimates of the ratio of mangrove forest: shrimp pond area necessary to remove nutrients from shrimp pond effluent are made using budgets of nitrogen and phosphorus output for semi-intensive and intensive shrimp ponds combined with estimates of total net primary production in Rhizophora-dominated mangrove forests in tropical coastal areas. If effluent is delivered directly to mangrove forest plots, it is estimated that, depending on shrimp pond management, between 2 and 22 hectares of forest are required to filter the nitrogen and phosphorus loads from effluent produced by a 1 hectare pond. While such ratios may apply to small scale, integrated shrimp aquaculture — mangrove forestry farming systems, the variability in mangrove hydrodynamics makes it difficult to apply such ratios at a regional scale. Before mangroves can be used to strip shrimp pond effluent more research is required on the effects that high ammonia and particulate organic matter loads in pond effluent have on nutrient transformations in mangrove sediments and on forest growth.
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  • 86
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    Hydrobiologia 297 (1995), S. 1-9 
    ISSN: 1573-5117
    Keywords: phosphorus ; nutrient deficiency ; phosphate ; phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mesocosms (1.3 m3) in a eutrophic reservoir were treated with NH4Cl (160 µmol l−1), KH2PO4 (10 µmol l−1) or nothing (control) and sampled after 8 days to determine how P dynamics are related to relative P deficiency. Photosynthetic rate and chlorophyll data suggested P deficiency in ammonium and control mesocosms and no P deficiency with phosphate additions. Biologically available P (BAP) and the ratio of BAP to soluble reactive P (SRP) decreased as P deficiency increased. Log of short-term uptake as a function of log of phosphate concentration exhibited an approximate linear increase in control and N mesocosms; substrate dependent uptake kinetics showed no saturation up to 500 µmol l−1 phosphate. Uptake was independent of phosphate concentration (saturated) in samples from the 10 µmol l−1 P enriched mesocosm. This suggests that P uptake may not saturate at ecologically realistic values in short term experiments under P deficient conditions. Particle associated phosphatase activity was greatest in the 0.2–3 µm size-fraction in all mesocosms, but total activity varied little with P deficiency.
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  • 87
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    Biogeochemistry 47 (1999), S. 25-38 
    ISSN: 1573-515X
    Keywords: Hedley fractionation ; phosphorus ; Ruttenberg fractionation ; soil phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract We used 16 soils to compare the Hedley method for soil phosphorus fractionation to an alternative method recently developed by Ruttenberg to differentiate among P fractions in marine sediments. For forms of labile and Fe-bound P in soils, these methods were poorly correlated, with the Hedley fractionation showing a greater ability to discriminate among variations in plant-available P. For Ca-bound P, total organic P, and total P, the methods were well correlated (r2=0.93, 0.48, 0.74, respectively), although the sum of P measured in the Ruttenberg extractions is only 45% of the total P recovered by the Hedley fractionation. The Hedley fractionation seems superior when an index of plant-available phosphorus and a separation of organic and inorganic forms is needed, whereas the Ruttenberg method allows a separation of CaCO3-bound P from apatite-P, which is potentially useful in calcareous soils.
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  • 88
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    Fish physiology and biochemistry 19 (1998), S. 83-93 
    ISSN: 1573-5168
    Keywords: phosphorus ; diet ; intestinal absorption ; renal excretion ; Atlantic salmon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies were conducted to determine the absorption, excretion and requirement of dietary phosphorus (P) by Atlantic salmon (Salmo salar). Triplicate groups of salmon parr, initial weight 15 ± 0.5±g , were fed, diets containing 4, 5, 6, 7, 8, 9, 11 and 13 mg P and 20 KJ of digestible energy (DE) per±g of diet (dry matter basis, DMB) to satiation for 16 weeks. The basal diet containing 4 mg P g-1 (0.15 mg available P per KJ DE) was supplemented with graded levels of calcium phosphate, Ca(H2PO4)2⋅H2O to formulate the eight experimental diets. The fish were reared in fresh water at a temperature of 15 °C on a 12 h photoperiod. Vertebrae ash increased from 316 to 516 mg g-1 fat-free dry matter with an increase in dietary P content. P requirement was estimated by using a four-parameter sigmoidal equation. The data suggests that a diet of 0.28 mg available P per KJ DE is needed for Atlantic salmon. Phosphate and calcium levels in plasma and bone increased, whereas levels of magnesium and liver cholecalciferol decreased, with an increase in dietary P. Phosphate excretion in urine and apparent availability of P were determined in deficient and replete fish. In deficient fish, the urine phosphate concentration was 0.10 mmol L-1 before feeding and 0.25 mmol l-1 after feeding, whereas in replete fish these concentrations were 1.09 and 5.11 mmol l-1, respectively. The increase in urine phosphate concentration was higher in replete fish than in deficient fish, however, the apparent absorption of P was found to be significantly lower in replete fish than in deficient fish. These results suggest that similarly to terrestrial vertebrates, P homeostasis in Atlantic salmon is controlled by absorption in the intestine, conservation in the kidney and storage in the bones.
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  • 89
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    Wetlands ecology and management 4 (1996), S. 177-187 
    ISSN: 1572-9834
    Keywords: nitrogen cycling ; phosphorus ; wetland ; succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compared the mechanisms of nitrogen (N) and phosphorus (P) removal in four young (〈15 years old) constructed estuarine marshes with paired mature natural marshes to determine how nutrient retention changes during wetland ecosystem succession. In constructed wetlands, N retention begins as soon as emergent vegetation becomes established and soil organic matter starts to accumulate, which is usually within the first 1–3 years. Accumulation of organic carbon in the soil sets the stage for denitrification which, after 5–10 years, removes approximately the same amount of N as accumulating organic matter, 5–10 g/m2/yr each, under conditions of low N loadings. Under high N loadings, the amount of N stored in accumulating organic matter doubles while N removal from denitrification may increase by an order of magnitude or more. Both organic N accumulation and denitrification provide for long-term reliable N removal regardless of N loading rates. Phosphorus removal, on the other hand, is greatest during the first 1–3 years of succession when sediment deposition and sorption/precipitation of P are greatest. During this time, constructed marshes may retain from 3 g P/m2/yr under low P loadings to as much as 30 g P/m2/yr under high loadings. However, as sedimentation decreases and sorption sites become saturated, P retention decreases to levels supported by organic P accumulation (1–2 g P/m2/yr) and sorption/precipitation with incoming aqueous and particulate Fe, Al and Ca. Phosphorus cycling in wetlands differs from forest and other terrestrial ecosystems in that conservation of P is greatest during the early years of succession, not during the middle or late stages. Conservation of P by wetlands is largely regulated by geochemical processes (sorption, precipitation) which operate independently of succession. In contrast, the conservation of N is controlled by biological processes (organic matter accumulation, denitrification) that change as succession proceeds.
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    Wetlands ecology and management 4 (1996), S. 199-206 
    ISSN: 1572-9834
    Keywords: constructed wetlands ; wastewater ; macrophytes ; nitrogen ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The first full-scale constructed wetland (CW) in the Czech Republic was built in 1989 and there are now three tertiary systems and 50 secondary treatment facilities. We report here on the design and operational efficiencies of these facilities. All CWs have been designed with horizontal subsurface flow. Coarse sand, gravel and crushed stones with size fraction of 4–16 mm are commonly used as substrates. The area of vegetated beds ranges between 18 and 4500 m2 and operational CWs are designed for population equivalent (PE) of 4 to 1,100. Common reed (Phragmites australis) is the most frequently used macrophyte species. Results from systems studied during 1994 and 1995 show that the effluent concentrations of organics and suspended solids (SS) are well below the required discharge limits. In most cases the final effluent BOD5 concentration is 〈10 mg l−1. The relationship between vegetated bed BOD5 inflow loadings (L 0) and outflow loadings (L) is very strong (r=0.92). Constructed wetlands with subsurface horizontal flow usually do not remove larger amounts of nitrogen and phosphorus. The results from five Czech constructed wetlands show that nitrogen removal varies among systems, but the amount of removed nitrogen is very predictable. A regression equation between nitrogen inflow loading (L 0) and outflow loading (L) produces a strong correlation (r=0.98). The most important process responsible for phosphorus removal in wetlands is precipitation with soil Ca, Fe and Al. However, the subsurface horizontal flow constructed wetlands use mostly coarse gravel and/or sandy materials and this provides little or no P precipitation. Results from monitored systems in the Czech Republic show that the percentage phosphorus removal varies widely among systems and is lower than the percentage removal of organics and suspended solids.
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  • 91
    ISSN: 1572-9834
    Keywords: Alnus glutinosa ; constructed ecosystems ; disinfection ; Iris pseudacorus ; multi-stage systems ; nitrogen ; phosphorus ; constructed treatment wetlands ; optimization ; purification efficiencies ; urban wastewaters treatment ; Typha latifolia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tests were carried out under controlled conditions in the Experimental Plant of Viville (Arlon, Belgium) to enhance the purification of urban wastewater by “natural” means. The results demonstrate the need to structure treatment systems in a series of different artificial ecosystems (or a Hierarchical Mosaic of Artificial Ecosystems — MHEA in French). The first two levels we used were made up of an unplanted aquatic ecosystem (stabilization pond) followed by a semi-aquatic ecosystem planted withTypha latifolia L. in which the water flows over the substrate. At a flow rate of 4 m2/PE (1 PE=150 1/day of typical urban wastewaters in Belgian rural zones), this first stage substantially reduces suspended solids (SS), COD and BOD5, a significant amount of tot-N and tot-P, and reduces pathogens by 100-fold. Further, the system is easy to manage (sludge is eliminated in the first stage and biomass is collected in the second stage) and the treatment system does not clog up. Nevertheless, real and sustainable environmental protection demands even higher performance rates, and these first two stages, both in terms of design and dimension, can only be considered as a satisfactory part of a MHEA system. Artificial aquatic, semi-aquatic, and terrestrial ecosystems were systematically compared at the third and fourth stage of the system to increase the overall removal efficiency. The most complete and efficient system in our tests (i.e., the one that provides the most successful primary (SS), secondary (COD and BOD5) and tertiary (N and P) treatment and the best pathogens removal rates) was made up of 3 sequential series of ecosystems: an aquatic ecosystem whose flow went into a plantedTypha latifolia system (surface water flow), that flowed into a terrestrial ecosystem planted withAlnus glutinosa (L.) Gaertn (vertical subsurface water flow). A total surface area (stages 1–4) of 8 m2/PE ensured a high performance level whose outflow conformed to the strictest European norms.
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  • 92
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    Wetlands ecology and management 6 (1998), S. 121-132 
    ISSN: 1572-9834
    Keywords: Lake Agmon ; Lake Hula ; Lake Kinneret ; phosphorus ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sixty km2 of the southern Hula Valley (northern Israel) peat lands were flooded in 1994 as part of the Hula Valley Restoration Project. The small, shallow lake (110 ha, mean depth 〈 1 m) and network of ca. 90 km of canals created were designed to ameliorate problems (e.g., underground fires, soil subsidence, increased nutrient loading downstream to Lake Kinneret) resulting from drying the Lake Hula wetlands in the 1950s. This new wetland area now serves as the focus for developing eco-tourism in northern Israel. The initial development of this new ecosystem has been followed closely by a multi-disciplinary team of researchers, with an emphasis on water quality in the new lake and the potential impact of the project on Lake Kinneret. Here we report an overview of developments in general water chemistry of Lake Agmon during its first three years (1994–1996). Water quality in Agmon was within general expectations for a shallow lake situated on peat. The first year of Agmon was characterized by the heavy influence of stream and drainage inflows with high pH, alkalinity, turbidity and electrical conductivity and high concentrations of sulfate and total dissolved solids. By the third year, however, many “in lake” processes (e.g., nutrient cycling and algal and macrophytic production) were well-developed and thus strongly affected lake water quality. Excessive phosphorus and nitrogen concentrations in the lake have led to hypertrophy, characterized by low dissolved oxygen concentrations and prolific blooms of nuisance algae. The management of this new ecosystem in the near future will require persistent, and innovative measures.
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    Wetlands ecology and management 7 (1999), S. 165-175 
    ISSN: 1572-9834
    Keywords: flow ; loading ; models ; phosphorus ; removal limits ; wetlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phosphorus concentrations exported from wetlands are explored via data and a first order model. The graph of outlet concentration versus areal phosphorus loading is used to display these data and the model. For a given wetland, data and models show that P concentrations show an ‘S’ curve response to increasing P loadings. The lower plateau is the background concentration and the upper plateau is the inlet concentration. The position of the ascending limb between the two plateaus is positioned differently for different wetlands. Phosphorus (P) removal in wetlands is often typified by a stable decreasing gradient of P concentrations from inlet to outlet, and an accompanying stable decreasing gradient in P assimilation. Limits to removal are inherent in the physical, chemical and biological processes. A lower outlet concentration limit exists because of the P cycle in the un-impacted wetland. The loading at which the outlet concentration departs from background, the lower knee in the loading curve, varies from wetland to wetland. An upper outlet concentration limit is imposed by the source concentration for extremely high inflows. The first order mass balance equation interpolates between these limits. The model gives further insights about performance within an overall envelope. The water carrying capacity of the wetland precludes flows in excess of the hydraulic conveyance capacity, thus limiting the possible P loadings to the system. Conversely, extremely low hydraulic loadings cause the wetland to be dominated by atmospheric additions and losses. The central tendency of inter-system data in the North American Database is shown to be inadequate to draw generalized conclusions about ecosystem processes in an individual wetland. The proposed ‘one gram rule’ of Richardson, et al. (1997) is shown to be an over-simplification.
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    Wetlands ecology and management 8 (2000), S. 197-207 
    ISSN: 1572-9834
    Keywords: benthic invertebrates ; mitigation ; nitrogen ; organic matter ; pedogenesis ; phosphorus ; plant productivity ; restoration and rehabilitation ; salt marsh ; wetland creation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of wetland soil characteristics andbenthic invertebrate communities were evaluated increated Spartina alterniflorasalt marshes inNorth Carolina ranging in age from 1 to 25 years-old.A combination of measurements from different-agecreated marshes as well as periodic measurements overtime on two marshes were used to (1) document rates ofwetland pedogenesis, especially soil organic matter,and, (2) explore relationships between soil andbenthic invertebrate community development. Soilmacro-organic matter (MOM, the living and dead rootand rhizome mat), organic C and N increased and bulkdensity decreased during the 25 years following marshestablishment. The most dramatic changes in bulkdensity, MOM, C and N occurred within the upper 10 cmof the soil with lesser changes below this depth.Created marshes were sinks for organic C (90–140g·m-2·yr-1) and N (7–11g·m-2·yr-1) but not for P (0–1g·m-2·yr-1). The density of benthicinvertebrates (〉250 μm) and subsurface-depositfeeding oligochaetes also increased over time oncreated salt marshes. Invertebrate and oligochaetedensity were strongly related to MOM content(r2= 0.83–0.87) and soil organic C(r2= 0.52–0.82) and N (r2= 0.62–0.84). Thesefindings suggest that, in created salt marshes,development of the benthic invertebrate community istied to marsh soil formation, especially accumulationof organic matter as MOM and soil. Field studies thatmanipulate the quantity and quality of soil organicmatter are needed to elucidate the relationshipbetween salt marsh pedogenesis and benthicinvertebrate community development.
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    Wetlands ecology and management 1 (1992), S. 211-222 
    ISSN: 1572-9834
    Keywords: freshwater marsh ; freshwater wetland ; Great Lakes ; hydrology ; phosphorus ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A coastal wetland along Lake Erie (Ohio, U.S.A.) was studied to determine hydrologic and phosphorus budgets and spatial and temporal variation of phosphorus and related chemical parameters. The wetland was influenced by changing Lake Erie water levels, seiches, shifting shoreline sediments, and watershed inflow during a year of severe drought. The water budget for a 7-month period (March – September, 1988) had average inflow of 15 200 m3 day−1 from the watershed and 3.5 m3 day−1 from Lake Erie. The wetland increased in volume by 700 m3 day−1 despite a drought that resulted in 80% more evapotranspiration than rainfall as a barrier beach isolated the wetland from Lake Erie for 77% of the study period. Conductivity decreased by 34% as water flowed through the wetland and turbidity and total suspended solids were variable and statistically similar at inflow and outflow. Average total phosphorus concentrations in the inflow and outflow were also similar (247 and 248 µg P l−1 respectively) although total soluble phosphorus and soluble reactive phosphorus decreased significantly (α=0.05) from inflow to outflow (averages 94 to 45 µg P l−1 and 7.5 to 4.0 µg P l−1 respectively). Nutrient budgets from field data estimate a retention of 36% of the phosphorus, presumably in the sediments (0.8 mg P m−2 day−1). A general nutrient retention model, an estimated deposition rate from a sediment core and a simulation model predicted higher mass retention of phosphorus but similar percentage retention. Sommaire Un marecage qui côtoie le lac Erie (USA) a servi de site expérimental pour en déterminer les budgets d'eau et de phosphore, de même que pour la variation spatiale et temporelle du phosphore et d'autres facteurs chimiques. Le marécage a été influencé par: niveaux d'eau qui changeaient; seiches; sédiments mouvants du littoral; et afflux de la ligne de partage des eaux dans une année de grande sécheresse. Le budget d'eau dans une période de 7 mois (mars–septembre 1988) montre un afflux de 15 200 m3 jour−1 de la ligne de partage, et 3.5 m3 jour−1 du lac Erie. Le volume du marécage a augmenté par 700 m3 jour−1 malgré une sécheresse qui a produit plus d'évapotranspiration (80%) que de pluie pendant qu'une plage-obstacle a isolé le marecage du lac Erie pendant 77% de la période d'observation. La conductivité a diminué par 34% pendant que l'eau coulait, et la turbidité et les TSS ont varié, tout en démontrant des statistiques similaires à l'afflux et au déversement. Les moyennes pour les concentrations du total du phosphore à l'afflux et au déversement ont été similaires (247 and 248 µg P l−1), quoique le TSP et le SRP ont diminué (α=0.05) de l'afflux au déversement (donant des moyennes de 94 à 45 µg P l−1 et de 7.5 à 4.0 µg P l'−1). Les budgets de substances nutritives pour les données suggèrent une reténtion de 36% du phosphore, évidemment dans les sédiments (0.8 mg P m−2 jour−1). Un modèle pour la rétention des nutrients, un taux de déposition, estimé par un noyau de sédiments, et une simulation avaient prédit un plus grand taux de rétention de phosphore, mais un pourcentage similaire pour la rétention.
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    Wetlands ecology and management 1 (1992), S. 239-247 
    ISSN: 1572-9834
    Keywords: biomass ; carbohydrates ; nitrogen ; phosphorus ; Phragmites australis ; potassium ; reed ; rhizome ; translocation ; wetland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal changes in rhizome concentrations of total nonstructural carbohydrates (TNC), water soluble carbohydrates (WSC), and mineral nutrients (N, P and K) were monitored in two Phragmites australis stands in southern Sweden. Rhizome biomass, rhizome length per unit ground area, and specific weight (weight/ length ratio) of the rhizomes were monitored in one of the stands. Rhizome biomass decreased during spring, increased during summer and decreased during winter. However, changes in spring and summer were small (〈 500 g DW m-2) compared to the mean rhizome biomass (approximately 3000 g DW m−2). Winter losses were larger, approximately 1000 g DW m-2, and to a substantial extent involved structural biomass, indicating rhizome mortality. Seasonal changes in rhizome length per unit ground area revealed a rhizome mortality of about 30% during the winter period, and also indicated that an intensive period of formation of new rhizomes occurred in June. Rhizome concentrations of TNC and WSC decreased during the spring, when carbohydrates were translocated to support shoot growth. However, rhizome standing stock of TNC remained large (〉 1000 g m−2). Concentrations and standing stocks of mineral nutrients decreased during spring/ early summer and increased during summer/ fall. Only N, however, showed a pattern consistent with a spring depletion caused by translocation to shoots. This pattern indicates sufficient root uptake of P and K to support spring growth, and supports other evidence that N is generally the limiting mineral nutrient for Phragmites. The biomass data, as well as increased rhizome specific weight and TNC concentrations, clearly suggests that “reloading” of rhizomes with energy reserves starts in June, not towards the end of the growing season as has been suggested previously. This resource allocation strategy of Phragmites has consequences for vegetation management. Our data indicate that carbohydrate reserves are much larger than needed to support spring growth. We propose that large stores are needed to ensure establishment of spring shoots when deep water or stochastic environmental events, such as high rhizome mortality in winter or loss of spring shoots due to late season frost, increase the demand for reserves.
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  • 97
    ISSN: 1572-9834
    Keywords: helophytes ; organic load ; nitrogen ; non-structural carbohydrates ; phosphorus ; potassium ; root porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract One-year-old clones ofPhragmites australis, Glyceria maxima, andTypha latifolia were subjected to different doses of piggery sewage added in flooded sand cultures for one growing season.Phragmites responded to increasing sewage doses by an increase in the shoot biomass and a decrease in root porosity and carbohydrate levels in rhizomes;Glyceria responded by a decrease in the biomass and depth penetration of the root system, and carbohydrate levels in rhizomes. In contrast,Typha increased both root porosity and carbohydrate levels in rhizomes. These findings are discussed in relationship to plant performance in sewage-polluted wetlands.
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    Reaction kinetics and catalysis letters 66 (1999), S. 177-181 
    ISSN: 1588-2837
    Keywords: Silica ; surface ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The interaction of gaseous PCl3 and POCl3 with dried and wetted pyrogenic silica has been studied by IR spectroscopy. The acceleration of the chemisorption accompanied by the formation of Si−O−P bonds in the presence of water vapor has been observed only with phosphorus trichloride.
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    Reaction kinetics and catalysis letters 66 (1999), S. 257-263 
    ISSN: 1588-2837
    Keywords: Alkylation ; toluene ; ZSM-5 ; phosphorus ; chromium ; nickel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract H-ZSM-5 zeolite was modified with phosphorus. The obtained P/ZSM-5 catalyst was subjected to further treatments with chromium and nickel. The distribution and strength of different acid sites of zeolites were investigated by means of temperature-programmed desorption of ammonia. The active and strong acid sites were confirmed by measuring the rate constants for cracking ofn-hexane, as a probe molecule. Reduction of pore opening size of the modified ZSM-5 was monitored by a standard test reaction of probe molecules ofm-xylene and ethylbenzene. Selective alkylation of toluene with methanol top-xylene was studied over ZSM-5 and modified zeolite catalysts. The P/ZSM-5 zeolite was the most selective catalyst top-xylene but the toluene conversion decreased drastically. The addition of chromium to P/ZSM-5 zeolite increased the toluene conversion and the yield ofp-xylene was very close to P/ZSM-5 catalyst. The addition of nickel did not exhibit a significant improvement of the catalyst performance. The deactivation of catalysts, due to coke deposition during run, was also considered. P/ZSM-5 zeolite showed the lowest stability with time on stream. The addition of chromium and nickel to P/ZSM-5 zeolite increased the stability of the catalyst.
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    Journal of thermal analysis and calorimetry 62 (2000), S. 335-344 
    ISSN: 1572-8943
    Keywords: phosphorus ; polydimethylsiloxane ; silica ; surface ; thermogravimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thermogravimetry, differential thermal analysis, and IR spectroscopy were used to investigate the process of thermal destruction of adsorbed polydimethylsiloxane (PDMS) in air. The disperse adsorbents were pristine fumed silica and modified fumed silica whose surface contained oxygen compounds of phosphorus. It was shown that under the given experimental conditions the thermal destruction of PDMS on the fumed silica surface was accompanied by the complete transformation of the adsorbed PDMS to SiO2. In the case of phosphorus-containing silica, the thermal destruction proceeded in a different way. It was found that at 140–300°C depolymerization of the siloxane chains of a certain part of the adsorbed polymer took place with the concurrent removal of volatile products of the reaction. However, the remaining part of the adsorbed PDMS interacted with the modified silica surface to form chemisorbed dimethylsilyl structures. The thermal destruction of the chemisorbed fragments of PDMS in air was initiated at 400°C or above for both types of silica investigated.
    Type of Medium: Electronic Resource
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