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  • Photosynthesis
  • Elsevier  (709)
  • Nature Publishing Group (NPG)  (47)
  • Massachusetts Institute of Technology and Woods Hole Oceanographic Institution  (3)
  • Blackwell Publishing Ltd
  • 1
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    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2009
    Description: Iron availability and primary productivity in the oceans are intricately linked through photosynthesis. At the global scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition experiments. At the atomic scale, we can describe the length and type of bonds that connect iron atoms to components of photosystem I, the most efficient light-harvesting complex in nature. Yet, we know little of how iron influences microbial diversity and distribution in the open ocean. In this study, we assess the influence of iron on the ecology of the numerically abundant marine cyanobacterium, Prochlorococcus. With its minimal genome and ubiquity in the global ocean, Prochlorococcus represents a model system in which to study the dynamics of the link between iron and primary productivity. To this end, we tested the iron physiology of two closely-related Prochlorococcus ecotypes. MED4 is adapted to high-light environments while MIT9313 lives best in low-light conditions. We determined that MIT9313 is capable of surviving at low iron concentrations that completely inhibit MED4. Furthermore, concentrations of Fe’ that inhibit growth in culture are sufficient to support Prochlorococcus growth in the field, which raises questions about the species of iron available to Prochlorococcus. We then examined the molecular basis for the ability of MIT9313 to grow at lower iron concentrations than MED4 by assessing whole-genome transcription in response to changes in iron availability in the two ecotypes. Genes that were differentially expressed fell into two categories: those that are shared by all (Prochlorococcus core genome) and those that are not (non-core genome). Only three genes shared between MED4 and MIT9313 were iron-responsive in both strains. We then tested the iron physiology of picocyanobacteria in the field and found that Synechococcus is iron-stressed in samples where Prochlorococcus is not. Finally, we propose a method to measure how iron stress in Prochlorococcus changes over natural gradients of iron in the oligotrophic ocean by quantifying transcription of the iron-stress induced gene, isiB. Taken together, our studies demonstrate that iron metabolism influences the ecology of Prochlorococcus both by contributing to its diversity and distinguishing it from other marine cyanobacteria.
    Description: This work was supported by grants from the Gordon and Betty Moore Foundation (#495 and #495.01), the National Science Foundation (OCE-0425602), the Center for Microbial Oceanography: Research and Education established by the National Science Foundation (Z792093-02), and the Department of Energy (DE-FG02-07ER64506 and DE-FG02-08ER64516) to Sallie W. Chisholm. In addition, the work was supported by grants to Mak A. Saito from the Office of Naval Research (N00014-05-1-0704), National Science Foundation Center for Microbial Oceanography: Research and Education (Z792384), National Science Foundation Environmental Genomics Program (0723667), and National Science Foundation Chemical Oceanography Program (OCE-0752271 and OCE-0452883).
    Keywords: Photosynthesis ; Iron ; Metabolism ; Knorr (Ship : 1970-) Cruise KN182-5 ; Knorr (Ship : 1970-) Cruise KN182-9
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
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  • 2
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 1979
    Description: Colonial radiolarians (Spumellaria) are among the most common and abundant large zooplankton, but they have been little studied by modern biologists. Colonies were found on 98% of epipelagic diving stations in the period from 1977 to 1979. Measured abundances ranged from .04 to 540 colonies per m3. Colony morphology of common genera and species is described and three new shell-less species which reach a length in excess of 1 m are discussed in detail. Some simple behavioral responses are documented, including control of colony buoyancy and position of algae in the colonies. Radiolarians feed on a wide variety of planktonic organisms including tintinnids, copepods, appendicularians, mollusc larvae and hydromedusae. They are hosts to parasitic hyperiid amphipods, particularly those of the genus Hyperietta. Radiolarians are prey of the amphipod Oxycephaius ciausi, an unidentified turbellarian and possibly the Harpacticoid copepods Miracia efferata and Sapphirina sp. Colonial radiolarians are also hosts to symbiotic dinoflagellates. Experiments were done at sea on the net incorporation of CO2 by these algae using 14C labelled NaHC03. Data from these experiments were related to content of carbon and chlorophyll as a function of colony size (cell number). Carbon content of colonies related well with colony size. Mean values were 50, 85, 100 and 200 ng C per radiolarian cell for coiiozoum inerme, C. iongiforme, Acrosphaera spinosa and coiiozoum radiosum respectively. Chlorophyll content varied widely between colonies and chlorophyll per radiolarian cell decreased with increasing colony size in Acrosphaera spinosa. Net carbon incorporation increased with colony size at given light intensities as did phutosynthetic assimilation (mmoles CO2.mg Chl a -l.hr -1) in A. spinosa. In experiments on the effect of light intensity on photosynthesis, there was no evidence for photoinhibition at high intensities in Acrosphaera spinosa. Replicate pieces of the large colonies of C. longiforme were incubated together, each colony at a different light intensity. Representative pieces were measured and used for chlorophyll carbon and nitrogen analysis and counted for abundance of radiolarian and algal cells and tintinnid prey. Incorporation per unit length varied little within colonies Photosynthetic assimilation followed no predictable pattern as a function of light intensity. However, it related directly to abundance of tintinnid prey remains. This effect apparently overrides that of light intensity. Total photosynthesis incorporation was only 0.1 to 0.8% of the total colony carbon per hour. The contribution of colonial radiolarians to total productivity of the regions studied was insignificant. However, the radiolarians' productivity is available to a unique portion of the planktonic food web. Because of their size and abundance radiolarians are important as substrates in their environment.
    Description: This research was supported in part by the Woods Hole Oceanographic Institution Education Program and the National Science Foundation, Oceanographic Section, Grant Nos. OCE75-2l7l5 and OCE77-225ll.
    Keywords: Radiolaria ; Marine zooplankton ; Marine ecology ; Photosynthesis ; Chain (Ship : 1958-) Cruise CH122 ; Chain (Ship : 1958-) Cruise CH123 ; Chain (Ship : 1958-) Cruise CH125 ; Knorr (Ship : 1970-) Cruise KN53 ; Columbus Iselin (Ship) Cruise CI76-2 ; Oceanus (Ship : 1975-) Cruise OC11 ; Knorr (Ship : 1970-) Cruise KN58 ; Oceanus (Ship : 1975-) Cruise OC22 ; Oceanus (Ship : 1975-) Cruise OC30 ; Oceanus (Ship : 1975-) Cruise OC33 ; Thomas Washington (Ship) Cruise ; Atlantis II (Ship : 1963-) Cruise AII98 ; Atlantis II (Ship : 1963-) Cruise AII101 ; Oceanus (Ship : 1975-) Cruise OC52 ; Anton Dohr (Ship) Cruise
    Repository Name: Woods Hole Open Access Server
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  • 3
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    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 1995
    Description: Fluctuations in light intensity due to vertical mixing in the open ocean surface layer will affect phytoplankton physiology. Conversely, indicators of phytoplankton photoacclimation will be diagnostic of mixing processes if the appropriate kinetics are known. A combination of laboratory and field experimental work, field observations, and theoretical models were used to quantify the relationship between vertical mixing and photoacclimation in determining the time and space evolution of single cell optical properties for the photosynthetic picoplankton, Prochlorococcus spp. Diel time-series observations from the Sargasso Sea reveal patterns in single-cell fluorescence distributions within Prochlorococcus spp. populations which appear to correspond to decreasing mixing rates and photoacclimation during the day, and increased mixing at night. Reciprocal light shift experiments were used to quantify the photoacclimation kinetics for Prochlorococcus spp. fluorescence. A laboratory continuous culture system was developed which could simulate the effects of mixing across a light gradient at the level of the individual cell. This system was operated at four different simulated diffusivities. Prochlorococcus marinus strain Med4 fluorescence distributions show distinct patterns in the mean and higher moments which are consistent with a simple quasi-steady turbulent diffusionphotoacclimation model. In both, daytime photoacclimation drove the development of a gradient in mean fluorescence, a decrease in variance overall, and skewing of distributions away from the boundaries. These results suggest that picophytoplankton single-cell fluorescence distributions could prove to be a useful diagnostic indicator of the mixing environment.
    Description: This project received primary financial support from the Office of Naval Research, with additional support from the National Science Foundation, the Environmental Protection Agency, Sea Grant, M.I.T. Sloan funds and M.I.T. Department of Civil and Environmental Engineering funds. I also wish to acknowledge support from a Rockwell Fellowship and a National Science Foundation Graduate Fellowship.
    Keywords: Phytoplankton ; Photosynthesis ; Primary productivity ; Acclimatization ; Oceanic mixing ; Oceanus (Ship : 1975-) Cruise OC214 ; Endeavor (Ship: 1976-) Cruise EN232
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  • 4
    Publication Date: 2010-11-12
    Description: Geochemical data from ancient sedimentary successions provide evidence for the progressive evolution of Earth's atmosphere and oceans. Key stages in increasing oxygenation are postulated for the Palaeoproterozoic era ( approximately 2.3 billion years ago, Gyr ago) and the late Proterozoic eon (about 0.8 Gyr ago), with the latter implicated in the subsequent metazoan evolutionary expansion. In support of this rise in oxygen concentrations, a large database shows a marked change in the bacterially mediated fractionation of seawater sulphate to sulphide of Delta(34)S 〈 25 per thousand before 1 Gyr to 〉/=50 per thousand after 0.64 Gyr. This change in Delta(34)S has been interpreted to represent the evolution from single-step bacterial sulphate reduction to a combination of bacterial sulphate reduction and sulphide oxidation, largely bacterially mediated. This evolution is seen as marking the rise in atmospheric oxygen concentrations and the evolution of non-photosynthetic sulphide-oxidizing bacteria. Here we report Delta(34)S values exceeding 50 per thousand from a terrestrial Mesoproterozoic (1.18 Gyr old) succession in Scotland, a time period that is at present poorly characterized. This level of fractionation implies disproportionation in the sulphur cycle, probably involving sulphide-oxidizing bacteria, that is not evident from Delta(34)S data in the marine record. Disproportionation in both red beds and lacustrine black shales at our study site suggests that the Mesoproterozoic terrestrial environment was sufficiently oxygenated to support a biota that was adapted to an oxygen-rich atmosphere, but had also penetrated into subsurface sediment.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parnell, John -- Boyce, Adrian J -- Mark, Darren -- Bowden, Stephen -- Spinks, Sam -- England -- Nature. 2010 Nov 11;468(7321):290-3. doi: 10.1038/nature09538.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK. j.parnell@abdn.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21068840" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Bacteria/metabolism ; Geologic Sediments/*chemistry/microbiology ; History, Ancient ; Iron/analysis/chemistry ; Oxidation-Reduction ; Oxygen/analysis/*metabolism ; Photosynthesis ; Scotland ; Seawater/chemistry ; Sulfates/metabolism ; Sulfides/analysis/chemistry/metabolism
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  • 5
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    Nature Publishing Group (NPG)
    Publication Date: 2010-12-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vedral, Vlatko -- England -- Nature. 2010 Dec 9;468(7325):769-70. doi: 10.1038/468769a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21150986" target="_blank"〉PubMed〈/a〉
    Keywords: Hot Temperature ; Models, Biological ; Photosynthesis ; *Quantum Theory ; *Thermodynamics
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  • 6
    Publication Date: 2008-01-04
    Description: The carbon balance of terrestrial ecosystems is particularly sensitive to climatic changes in autumn and spring, with spring and autumn temperatures over northern latitudes having risen by about 1.1 degrees C and 0.8 degrees C, respectively, over the past two decades. A simultaneous greening trend has also been observed, characterized by a longer growing season and greater photosynthetic activity. These observations have led to speculation that spring and autumn warming could enhance carbon sequestration and extend the period of net carbon uptake in the future. Here we analyse interannual variations in atmospheric carbon dioxide concentration data and ecosystem carbon dioxide fluxes. We find that atmospheric records from the past 20 years show a trend towards an earlier autumn-to-winter carbon dioxide build-up, suggesting a shorter net carbon uptake period. This trend cannot be explained by changes in atmospheric transport alone and, together with the ecosystem flux data, suggest increasing carbon losses in autumn. We use a process-based terrestrial biosphere model and satellite vegetation greenness index observations to investigate further the observed seasonal response of northern ecosystems to autumnal warming. We find that both photosynthesis and respiration increase during autumn warming, but the increase in respiration is greater. In contrast, warming increases photosynthesis more than respiration in spring. Our simulations and observations indicate that northern terrestrial ecosystems may currently lose carbon dioxide in response to autumn warming, with a sensitivity of about 0.2 PgC degrees C(-1), offsetting 90% of the increased carbon dioxide uptake during spring. If future autumn warming occurs at a faster rate than in spring, the ability of northern ecosystems to sequester carbon may be diminished earlier than previously suggested.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Piao, Shilong -- Ciais, Philippe -- Friedlingstein, Pierre -- Peylin, Philippe -- Reichstein, Markus -- Luyssaert, Sebastiaan -- Margolis, Hank -- Fang, Jingyun -- Barr, Alan -- Chen, Anping -- Grelle, Achim -- Hollinger, David Y -- Laurila, Tuomas -- Lindroth, Anders -- Richardson, Andrew D -- Vesala, Timo -- England -- Nature. 2008 Jan 3;451(7174):49-52. doi: 10.1038/nature06444.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉LSCE, UMR CEA-CNRS, Batiment 709, CE, L'Orme des Merisiers, F-91191 Gif-sur-Yvette, France. slpiao@lsce.ipsl.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18172494" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Biomass ; Carbon Dioxide/analysis/*metabolism ; Cell Respiration ; *Ecosystem ; Fossil Fuels ; Geography ; Greenhouse Effect ; History, 20th Century ; History, 21st Century ; Oceans and Seas ; Photosynthesis ; Plant Transpiration ; Plants/metabolism ; Rain ; *Seasons ; Soil/analysis ; *Temperature ; Water/metabolism
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  • 7
    Publication Date: 2008-02-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keeling, Patrick J -- England -- Nature. 2008 Feb 21;451(7181):896-7. doi: 10.1038/451896a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18288173" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Eukaryota/classification/cytology ; Eukaryotic Cells/*classification/*cytology/metabolism ; Parasites/*classification/*cytology/genetics ; Photosynthesis ; *Phylogeny ; Plasmodium falciparum/classification ; Plastids/*metabolism
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  • 8
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    Nature Publishing Group (NPG)
    Publication Date: 2008-02-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meyer, Thomas J -- England -- Nature. 2008 Feb 14;451(7180):778-9. doi: 10.1038/451778a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18273008" target="_blank"〉PubMed〈/a〉
    Keywords: Catalysis ; Hydrogen/chemistry ; Oxidation-Reduction ; Oxygen/chemistry ; Photosynthesis ; Water/*chemistry
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  • 9
    Publication Date: 2008-01-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heimann, Martin -- Reichstein, Markus -- England -- Nature. 2008 Jan 17;451(7176):289-92. doi: 10.1038/nature06591.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute for Biogeochemistry, Hans-Knoll-Strasse 10, D-07745 Jena, Germany. martin.heimann@bgc-jena.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18202646" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carbon/*metabolism ; Carbon Dioxide/metabolism ; Cell Respiration ; *Climate ; *Ecosystem ; *Feedback ; Photosynthesis
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  • 10
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    Nature Publishing Group (NPG)
    Publication Date: 2009-07-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hand, Eric -- England -- Nature. 2009 Jul 9;460(7252):161. doi: 10.1038/460161a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19587733" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Carbon/metabolism ; Cell Respiration ; *Earth (Planet) ; *Ecosystem ; Fossils ; History, Ancient ; Oceans and Seas ; Oxygen/analysis/*metabolism ; Photosynthesis ; Plants/*metabolism ; Seawater/chemistry
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  • 11
    Publication Date: 2009-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arthur, Michael A -- England -- Nature. 2009 Aug 6;460(7256):698-9. doi: 10.1038/460698a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19661908" target="_blank"〉PubMed〈/a〉
    Keywords: Calcium Carbonate/chemistry ; Carbon/chemistry/*metabolism ; Carbon Isotopes ; Carbonates/*analysis/*chemistry ; Earth (Planet) ; Geologic Sediments/*chemistry ; History, Ancient ; Oceans and Seas ; Oxygen/analysis ; Oxygen Isotopes ; Photosynthesis ; Plants/metabolism
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  • 12
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    Nature Publishing Group (NPG)
    Publication Date: 2009-09-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, Jane -- England -- Nature. 2009 Sep 3;461(7260):34-6. doi: 10.1038/461034a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19727180" target="_blank"〉PubMed〈/a〉
    Keywords: Alaska ; Animals ; Arctic Regions ; Atmosphere/chemistry ; Carbon/*analysis/metabolism ; Carbon Dioxide/analysis/metabolism ; *Ecosystem ; *Fires ; Freezing ; Fresh Water/chemistry ; Geologic Sediments/chemistry ; Greenhouse Effect ; Photosynthesis ; Soil/analysis
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  • 13
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    Nature Publishing Group (NPG)
    Publication Date: 2009-05-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2009 May 14;459(7244):140. doi: 10.1038/459140a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19444162" target="_blank"〉PubMed〈/a〉
    Keywords: *Marine Biology/trends ; Photosynthesis ; Prochlorococcus/growth & development/isolation & purification/metabolism ; Time Factors ; *Water Microbiology
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  • 14
    Publication Date: 2014-12-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gruber, Nicolas -- England -- Nature. 2015 Jan 8;517(7533):148-9. doi: 10.1038/nature14082. Epub 2014 Dec 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Environmental Physics Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25487156" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/metabolism ; Atmosphere/chemistry ; Carbon Dioxide/*analysis ; *Carbon Sequestration ; *Ecosystem ; Human Activities ; *Oceans and Seas ; Photosynthesis
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  • 15
    Publication Date: 2015-03-06
    Description: In 2005 and 2010 the Amazon basin experienced two strong droughts, driven by shifts in the tropical hydrological regime possibly associated with global climate change, as predicted by some global models. Tree mortality increased after the 2005 drought, and regional atmospheric inversion modelling showed basin-wide decreases in CO2 uptake in 2010 compared with 2011 (ref. 5). But the response of tropical forest carbon cycling to these droughts is not fully understood and there has been no detailed multi-site investigation in situ. Here we use several years of data from a network of thirteen 1-ha forest plots spread throughout South America, where each component of net primary production (NPP), autotrophic respiration and heterotrophic respiration is measured separately, to develop a better mechanistic understanding of the impact of the 2010 drought on the Amazon forest. We find that total NPP remained constant throughout the drought. However, towards the end of the drought, autotrophic respiration, especially in roots and stems, declined significantly compared with measurements in 2009 made in the absence of drought, with extended decreases in autotrophic respiration in the three driest plots. In the year after the drought, total NPP remained constant but the allocation of carbon shifted towards canopy NPP and away from fine-root NPP. Both leaf-level and plot-level measurements indicate that severe drought suppresses photosynthesis. Scaling these measurements to the entire Amazon basin with rainfall data, we estimate that drought suppressed Amazon-wide photosynthesis in 2010 by 0.38 petagrams of carbon (0.23-0.53 petagrams of carbon). Overall, we find that during this drought, instead of reducing total NPP, trees prioritized growth by reducing autotrophic respiration that was unrelated to growth. This suggests that trees decrease investment in tissue maintenance and defence, in line with eco-evolutionary theories that trees are competitively disadvantaged in the absence of growth. We propose that weakened maintenance and defence investment may, in turn, cause the increase in post-drought tree mortality observed at our plots.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doughty, Christopher E -- Metcalfe, D B -- Girardin, C A J -- Amezquita, F Farfan -- Cabrera, D Galiano -- Huasco, W Huaraca -- Silva-Espejo, J E -- Araujo-Murakami, A -- da Costa, M C -- Rocha, W -- Feldpausch, T R -- Mendoza, A L M -- da Costa, A C L -- Meir, P -- Phillips, O L -- Malhi, Y -- England -- Nature. 2015 Mar 5;519(7541):78-82. doi: 10.1038/nature14213.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, UK. ; Department of Physical Geography and Ecosystem Science, Lund University, Solvegatan 12, 223 62 Lund, Sweden. ; Universidad Nacional San Antonio Abad de Cusco, Apartado Postal Nro 921, Cusco, Peru ; Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Av. Irala 565, Casilla 2489, Santa Cruz, Bolivia. ; Universidade Federal do Para, Instituto de Geociencias, Faculdade de Meteorologia, Rua Augusto Correa, n degrees 01, CEP 66075 - 110, Belem, Para, Brazil. ; IPAM Instituto de Pesquisa Ambiental da Amazonia Rua Horizontina, 104, Centro, 78640-000 Canarana, Mato Grosso, Brazil. ; Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK. ; 1] School of Geosciences, University of Edinburgh, Edinburgh EH9 3FF, UK [2] Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia. ; School of Geography, University of Leeds, Leeds LS2 9JT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25739631" target="_blank"〉PubMed〈/a〉
    Keywords: Brazil ; Carbon/*metabolism ; Carbon Dioxide/metabolism ; Cell Respiration ; *Droughts ; *Forests ; Photosynthesis ; Trees/cytology/metabolism ; *Tropical Climate
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  • 16
    Publication Date: 2012-03-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Falkowski, Paul -- England -- Nature. 2012 Feb 29;483(7387):S21. doi: 10.1038/483S21a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22378124" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/*metabolism ; Environmental Restoration and Remediation ; Eutrophication ; Extinction, Biological ; *Global Warming ; *Human Activities ; Interdisciplinary Studies ; Marine Biology ; Photosynthesis ; Phytoplankton/*metabolism ; Seawater/chemistry/microbiology ; Time Factors
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  • 17
    Publication Date: 2012-04-27
    Description: The phenology of growth in temperate deciduous forests, including the timing of leaf emergence and senescence, has strong control over ecosystem properties such as productivity and nutrient cycling, and has an important role in the carbon economy of understory plants. Extended leaf phenology, whereby understory species assimilate carbon in early spring before canopy closure or in late autumn after canopy fall, has been identified as a key feature of many forest species invasions, but it remains unclear whether there are systematic differences in the growth phenology of native and invasive forest species or whether invaders are more responsive to warming trends that have lengthened the duration of spring or autumn growth. Here, in a 3-year monitoring study of 43 native and 30 non-native shrub and liana species common to deciduous forests in the eastern United States, I show that extended autumn leaf phenology is a common attribute of eastern US forest invasions, where non-native species are extending the autumn growing season by an average of 4 weeks compared with natives. In contrast, there was no consistent evidence that non-natives as a group show earlier spring growth phenology, and non-natives were not better able to track interannual variation in spring temperatures. Seasonal leaf production and photosynthetic data suggest that most non-native species capture a significant proportion of their annual carbon assimilate after canopy leaf fall, a behaviour that was virtually absent in natives and consistent across five phylogenetic groups. Pronounced differences in how native and non-native understory species use pre- and post-canopy environments suggest eastern US invaders are driving a seasonal redistribution of forest productivity that may rival climate change in its impact on forest processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fridley, Jason D -- England -- Nature. 2012 May 17;485(7398):359-62. doi: 10.1038/nature11056.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Syracuse University, 107 College Place, Syracuse, New York 13244, USA. fridley@syr.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22535249" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/metabolism ; *Ecosystem ; *Introduced Species ; Photosynthesis ; Plant Leaves/classification/*growth & development ; *Seasons ; Temperature ; Time Factors ; Trees/classification/*growth & development ; United States
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  • 18
    Publication Date: 2012-03-20
    Description: Two decades of scientific ocean drilling have demonstrated widespread microbial life in deep sub-seafloor sediment, and surprisingly high microbial-cell numbers. Despite the ubiquity of life in the deep biosphere, the large community sizes and the low energy fluxes in this vast buried ecosystem are not yet understood. It is not known whether organisms of the deep biosphere are specifically adapted to extremely low energy fluxes or whether most of the observed cells are in a dormant, spore-like state. Here we apply a new approach--the D:L-amino-acid model--to quantify the distributions and turnover times of living microbial biomass, endospores and microbial necromass, as well as to determine their role in the sub-seafloor carbon budget. The approach combines sensitive analyses of unique bacterial markers (muramic acid and D-amino acids) and the bacterial endospore marker, dipicolinic acid, with racemization dynamics of stereo-isomeric amino acids. Endospores are as abundant as vegetative cells and microbial activity is extremely low, leading to microbial biomass turnover times of hundreds to thousands of years. We infer from model calculations that biomass production is sustained by organic carbon deposited from the surface photosynthetic world millions of years ago and that microbial necromass is recycled over timescales of hundreds of thousands of years.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lomstein, Bente Aa -- Langerhuus, Alice T -- D'Hondt, Steven -- Jorgensen, Bo B -- Spivack, Arthur J -- England -- Nature. 2012 Mar 18;484(7392):101-4. doi: 10.1038/nature10905.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bioscience, Section for Microbiology, Aarhus University, Building 1540, Ny Munkegade 114, DK-8000 Aarhus C, Denmark. bente.lomstein@biology.au.dk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22425999" target="_blank"〉PubMed〈/a〉
    Keywords: Altitude ; Amino Acids/analysis/chemistry/metabolism ; Aquatic Organisms/chemistry/growth & development/*isolation & purification ; Archaea/chemistry/cytology/*growth & development/isolation & purification ; Bacteria/chemistry/cytology/*growth & development/isolation & purification ; Biomarkers/analysis ; *Biomass ; Carbon/metabolism ; Cell Wall/chemistry ; Geologic Sediments/*microbiology ; Muramic Acids/analysis ; Oceans and Seas ; Oxidation-Reduction ; Peru ; Photosynthesis ; Picolinic Acids/analysis ; Seawater/*microbiology ; Spores, Bacterial/chemistry/growth & development/isolation & purification ; Time Factors
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  • 19
    Publication Date: 2013-05-17
    Description: High latitudes contain nearly half of global soil carbon, prompting interest in understanding how the Arctic terrestrial carbon balance will respond to rising temperatures. Low temperatures suppress the activity of soil biota, retarding decomposition and nitrogen release, which limits plant and microbial growth. Warming initially accelerates decomposition, increasing nitrogen availability, productivity and woody-plant dominance. However, these responses may be transitory, because coupled abiotic-biotic feedback loops that alter soil-temperature dynamics and change the structure and activity of soil communities, can develop. Here we report the results of a two-decade summer warming experiment in an Alaskan tundra ecosystem. Warming increased plant biomass and woody dominance, indirectly increased winter soil temperature, homogenized the soil trophic structure across horizons and suppressed surface-soil-decomposer activity, but did not change total soil carbon or nitrogen stocks, thereby increasing net ecosystem carbon storage. Notably, the strongest effects were in the mineral horizon, where warming increased decomposer activity and carbon stock: a 'biotic awakening' at depth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sistla, Seeta A -- Moore, John C -- Simpson, Rodney T -- Gough, Laura -- Shaver, Gaius R -- Schimel, Joshua P -- England -- Nature. 2013 May 30;497(7451):615-8. doi: 10.1038/nature12129. Epub 2013 May 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, California 93108, USA. sistla@lifesci.ucsb.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23676669" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arctic Regions ; Biomass ; Carbon/*analysis ; *Carbon Cycle ; *Cold Climate ; Discriminant Analysis ; *Ecosystem ; Food Chain ; Global Warming/*statistics & numerical data ; History, 20th Century ; History, 21st Century ; Nitrogen/metabolism ; Photosynthesis ; Plants/metabolism ; Rain ; Soil/analysis/*chemistry/parasitology ; Soil Microbiology ; *Temperature ; Time Factors ; Uncertainty
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  • 20
    Publication Date: 2013-04-05
    Description: The technological demand to push the gigahertz (10(9) hertz) switching speed limit of today's magnetic memory and logic devices into the terahertz (10(12) hertz) regime underlies the entire field of spin-electronics and integrated multi-functional devices. This challenge is met by all-optical magnetic switching based on coherent spin manipulation. By analogy to femtosecond chemistry and photosynthetic dynamics--in which photoproducts of chemical and biochemical reactions can be influenced by creating suitable superpositions of molecular states--femtosecond-laser-excited coherence between electronic states can switch magnetic order by 'suddenly' breaking the delicate balance between competing phases of correlated materials: for example, manganites exhibiting colossal magneto-resistance suitable for applications. Here we show femtosecond (10(-15) seconds) photo-induced switching from antiferromagnetic to ferromagnetic ordering in Pr0.7Ca0.3MnO3, by observing the establishment (within about 120 femtoseconds) of a huge temperature-dependent magnetization with photo-excitation threshold behaviour absent in the optical reflectivity. The development of ferromagnetic correlations during the femtosecond laser pulse reveals an initial quantum coherent regime of magnetism, distinguished from the picosecond (10(-12) seconds) lattice-heating regime characterized by phase separation without threshold behaviour. Our simulations reproduce the nonlinear femtosecond spin generation and underpin fast quantum spin-flip fluctuations correlated with coherent superpositions of electronic states to initiate local ferromagnetic correlations. These results merge two fields, femtosecond magnetism in metals and band insulators, and non-equilibrium phase transitions of strongly correlated electrons, in which local interactions exceeding the kinetic energy produce a complex balance of competing orders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Tianqi -- Patz, Aaron -- Mouchliadis, Leonidas -- Yan, Jiaqiang -- Lograsso, Thomas A -- Perakis, Ilias E -- Wang, Jigang -- England -- Nature. 2013 Apr 4;496(7443):69-73. doi: 10.1038/nature11934.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23552945" target="_blank"〉PubMed〈/a〉
    Keywords: Biology ; Chemistry ; Circular Dichroism ; Electronics ; Iron/chemistry ; *Magnetic Phenomena ; Magnetics ; Optics and Photonics ; Photosynthesis ; *Quantum Theory ; Temperature ; Time Factors
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  • 21
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    Nature Publishing Group (NPG)
    Publication Date: 2013-10-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2013 Oct 17;502(7471):S60-1. doi: 10.1038/502S60a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24132337" target="_blank"〉PubMed〈/a〉
    Keywords: Biofuels/adverse effects/economics ; Biomass ; Climate Change/statistics & numerical data ; Photosynthesis ; *Renewable Energy/economics ; Solar Energy/economics ; Technology/economics/*trends
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  • 22
    Publication Date: 2013-02-08
    Description: The release of carbon from tropical forests may exacerbate future climate change, but the magnitude of the effect in climate models remains uncertain. Coupled climate-carbon-cycle models generally agree that carbon storage on land will increase as a result of the simultaneous enhancement of plant photosynthesis and water use efficiency under higher atmospheric CO(2) concentrations, but will decrease owing to higher soil and plant respiration rates associated with warming temperatures. At present, the balance between these effects varies markedly among coupled climate-carbon-cycle models, leading to a range of 330 gigatonnes in the projected change in the amount of carbon stored on tropical land by 2100. Explanations for this large uncertainty include differences in the predicted change in rainfall in Amazonia and variations in the responses of alternative vegetation models to warming. Here we identify an emergent linear relationship, across an ensemble of models, between the sensitivity of tropical land carbon storage to warming and the sensitivity of the annual growth rate of atmospheric CO(2) to tropical temperature anomalies. Combined with contemporary observations of atmospheric CO(2) concentration and tropical temperature, this relationship provides a tight constraint on the sensitivity of tropical land carbon to climate change. We estimate that over tropical land from latitude 30 degrees north to 30 degrees south, warming alone will release 53 +/- 17 gigatonnes of carbon per kelvin. Compared with the unconstrained ensemble of climate-carbon-cycle projections, this indicates a much lower risk of Amazon forest dieback under CO(2)-induced climate change if CO(2) fertilization effects are as large as suggested by current models. Our study, however, also implies greater certainty that carbon will be lost from tropical land if warming arises from reductions in aerosols or increases in other greenhouse gases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cox, Peter M -- Pearson, David -- Booth, Ben B -- Friedlingstein, Pierre -- Huntingford, Chris -- Jones, Chris D -- Luke, Catherine M -- England -- Nature. 2013 Feb 21;494(7437):341-4. doi: 10.1038/nature11882. Epub 2013 Feb 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Engineering, Mathematics and Physical Science, University of Exeter, Exeter EX4 4QF, UK. p.m.cox@exeter.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23389447" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Cycle/*physiology ; Carbon Dioxide/analysis/*metabolism ; Cell Respiration ; *Climate Change ; *Models, Theoretical ; Photosynthesis ; Rain ; Temperature ; Trees/*metabolism ; *Tropical Climate ; Uncertainty
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  • 23
    Publication Date: 2013-08-30
    Description: Coccolithophores are marine algae that use carbon for calcification and photosynthesis. The long-term adaptation of these and other marine algae to decreasing carbon dioxide levels during the Cenozoic era has resulted in modern algae capable of actively enhancing carbon dioxide at the site of photosynthesis. This enhancement occurs through the transport of dissolved bicarbonate (HCO3(-)) and with the help of enzymes whose expression can be modulated by variable aqueous carbon dioxide concentration, [CO2], in laboratory cultures. Coccolithophores preserve the geological history of this adaptation because the stable carbon and oxygen isotopic compositions of their calcite plates (coccoliths), which are preserved in the fossil record, are sensitive to active carbon uptake and transport by the cell. Here we use a model of cellular carbon fluxes and show that at low [CO2] the increased demand for HCO3(-) at the site of photosynthesis results in a diminished allocation of HCO3(-) to calcification, which is most pronounced in larger cells. This results in a large divergence between the carbon isotopic compositions of small versus large coccoliths only at low [CO2]. Our evaluation of the oxygen and carbon isotope record of size-separated fossil coccoliths reveals that this isotopic divergence first arose during the late Miocene to the earliest Pliocene epoch (about 7-5 million years ago). We interpret this to be a threshold response of the cells' carbon acquisition strategies to decreasing [CO2]. The documented coccolithophore response is synchronous with a global shift in terrestrial vegetation distribution between 8 and 5 Myr ago, which has been interpreted by some studies as a floral response to decreasing partial pressures of carbon dioxide () in the atmosphere. We infer a global decrease in carbon dioxide levels for this time interval that has not yet been identified in the sparse proxy record but is synchronous with global cooling and progressive glaciations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bolton, Clara T -- Stoll, Heather M -- England -- Nature. 2013 Aug 29;500(7464):558-62. doi: 10.1038/nature12448.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geology Department, University of Oviedo, Jesus Arias de Velasco S/N, 33005, Oviedo, Asturias, Spain. cbolton@geol.uniovi.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23985873" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/*metabolism ; Atmosphere/chemistry ; Bicarbonates/metabolism ; Calcification, Physiologic ; Calcium Carbonate/chemistry/metabolism ; Carbon/metabolism ; Carbon Dioxide/analysis/*metabolism ; Carbon Isotopes ; Chloroplasts/metabolism ; Climate ; Fossils ; History, Ancient ; Oxygen Isotopes ; Partial Pressure ; Photosynthesis ; Phytoplankton/*metabolism ; Temperature
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  • 24
    Publication Date: 2014-02-21
    Description: The rapid increase of carbon dioxide concentration in Earth's modern atmosphere is a matter of major concern. But for the atmosphere of roughly two-and-half billion years ago, interest centres on a different gas: free oxygen (O2) spawned by early biological production. The initial increase of O2 in the atmosphere, its delayed build-up in the ocean, its increase to near-modern levels in the sea and air two billion years later, and its cause-and-effect relationship with life are among the most compelling stories in Earth's history.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lyons, Timothy W -- Reinhard, Christopher T -- Planavsky, Noah J -- England -- Nature. 2014 Feb 20;506(7488):307-15. doi: 10.1038/nature13068.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of California, Riverside, California 92521, USA. ; 1] Department of Earth Sciences, University of California, Riverside, California 92521, USA [2] Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA [3] School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. ; 1] Department of Earth Sciences, University of California, Riverside, California 92521, USA [2] Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24553238" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere/*chemistry ; *Earth (Planet) ; *Evolution, Chemical ; History, Ancient ; Life ; Oxygen/analysis/history/*metabolism ; Photosynthesis ; Seawater/*chemistry
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  • 25
    Publication Date: 2014-04-25
    Description: Tropical forests are global epicentres of biodiversity and important modulators of climate change, and are mainly constrained by rainfall patterns. The severe short-term droughts that occurred recently in Amazonia have drawn attention to the vulnerability of tropical forests to climatic disturbances. The central African rainforests, the second-largest on Earth, have experienced a long-term drying trend whose impacts on vegetation dynamics remain mostly unknown because in situ observations are very limited. The Congolese forest, with its drier conditions and higher percentage of semi-evergreen trees, may be more tolerant to short-term rainfall reduction than are wetter tropical forests, but for a long-term drought there may be critical thresholds of water availability below which higher-biomass, closed-canopy forests transition to more open, lower-biomass forests. Here we present observational evidence for a widespread decline in forest greenness over the past decade based on analyses of satellite data (optical, thermal, microwave and gravity) from several independent sensors over the Congo basin. This decline in vegetation greenness, particularly in the northern Congolese forest, is generally consistent with decreases in rainfall, terrestrial water storage, water content in aboveground woody and leaf biomass, and the canopy backscatter anomaly caused by changes in structure and moisture in upper forest layers. It is also consistent with increases in photosynthetically active radiation and land surface temperature. These multiple lines of evidence indicate that this large-scale vegetation browning, or loss of photosynthetic capacity, may be partially attributable to the long-term drying trend. Our results suggest that a continued gradual decline of photosynthetic capacity and moisture content driven by the persistent drying trend could alter the composition and structure of the Congolese forest to favour the spread of drought-tolerant species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Liming -- Tian, Yuhong -- Myneni, Ranga B -- Ciais, Philippe -- Saatchi, Sassan -- Liu, Yi Y -- Piao, Shilong -- Chen, Haishan -- Vermote, Eric F -- Song, Conghe -- Hwang, Taehee -- England -- Nature. 2014 May 1;509(7498):86-90. doi: 10.1038/nature13265. Epub 2014 Apr 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York (SUNY), Albany, New York 12222, USA. ; I. M. Systems Group (IMSG), National Oceanic and Atmospheric Administration/National Environmental Satellite, Data, and Information Service/The Center for Satellite Applications and Research (NOAA/NESDIS/STAR), 5830 University Research Court, College Park, Maryland 20740, USA. ; Department of Earth and Environment, Boston University, Boston, Massachusetts 02215, USA. ; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CEA-CNRS-UVSQ, 91191 Gif sur Yvette Cedex, France. ; Jet Propulsion Laboratory, Pasadena, California 91109, USA. ; ARC Centre of Excellence for Climate Systems Science & Climate Change Research Centre, University of New South Wales, Sydney, New South Wales 2052, Australia. ; Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. ; Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China. ; NASA Goddard Space Flight Center, Code 619, Greenbelt, Maryland 20771, USA. ; 1] Department of Geography, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 29599, USA [2] School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui 230036, China. ; Institute for the Environment, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 29599, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24759324" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Biodiversity ; Biomass ; Chlorophyll/analysis/metabolism ; Climate Change/*statistics & numerical data ; Congo ; Droughts/statistics & numerical data ; Photosynthesis ; Plant Leaves/*growth & development/metabolism ; *Rain ; Satellite Imagery ; Seasons ; Temperature ; Time Factors ; Trees/*growth & development/metabolism ; *Tropical Climate ; Water/analysis/metabolism ; Wood/growth & development/metabolism
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  • 26
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2011-08-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hutchins, David A -- England -- Nature. 2011 Aug 3;476(7358):41-2. doi: 10.1038/476041a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21814273" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/chemistry/metabolism ; Atmosphere/chemistry ; *Calcification, Physiologic ; Calcium Carbonate/*analysis/chemistry/metabolism ; Carbon Cycle ; Carbon Dioxide/*analysis/chemistry ; Carbonic Acid/*analysis/chemistry ; Fossils ; Hydrogen-Ion Concentration ; Oceans and Seas ; Photosynthesis ; Phytoplankton/chemistry/*metabolism ; *Rain ; Seawater/*chemistry
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  • 27
    Publication Date: 2011-08-05
    Description: About one-third of the carbon dioxide (CO(2)) released into the atmosphere as a result of human activity has been absorbed by the oceans, where it partitions into the constituent ions of carbonic acid. This leads to ocean acidification, one of the major threats to marine ecosystems and particularly to calcifying organisms such as corals, foraminifera and coccolithophores. Coccolithophores are abundant phytoplankton that are responsible for a large part of modern oceanic carbonate production. Culture experiments investigating the physiological response of coccolithophore calcification to increased CO(2) have yielded contradictory results between and even within species. Here we quantified the calcite mass of dominant coccolithophores in the present ocean and over the past forty thousand years, and found a marked pattern of decreasing calcification with increasing partial pressure of CO(2) and concomitant decreasing concentrations of CO(3)(2-). Our analyses revealed that differentially calcified species and morphotypes are distributed in the ocean according to carbonate chemistry. A substantial impact on the marine carbon cycle might be expected upon extrapolation of this correlation to predicted ocean acidification in the future. However, our discovery of a heavily calcified Emiliania huxleyi morphotype in modern waters with low pH highlights the complexity of assemblage-level responses to environmental forcing factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beaufort, L -- Probert, I -- de Garidel-Thoron, T -- Bendif, E M -- Ruiz-Pino, D -- Metzl, N -- Goyet, C -- Buchet, N -- Coupel, P -- Grelaud, M -- Rost, B -- Rickaby, R E M -- de Vargas, C -- 205150/European Research Council/International -- England -- Nature. 2011 Aug 3;476(7358):80-3. doi: 10.1038/nature10295.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CEREGE, CNRS/Universite Aix-Marseille, Avenue L. Philibert BP80, 13545 Aix-en-Provence, Cedex 4, France. beaufort@cerege.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21814280" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/chemistry/metabolism ; Atmosphere/chemistry ; Body Weight ; *Calcification, Physiologic ; Calcium/metabolism ; Calcium Carbonate/*analysis/chemistry/metabolism ; Carbon Cycle ; Carbon Dioxide/analysis/chemistry ; Carbonic Acid/*analysis/chemistry ; Fossils ; Geologic Sediments/chemistry ; Haptophyta/chemistry/*metabolism ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; Oceans and Seas ; Pacific Ocean ; Partial Pressure ; Photosynthesis ; Phytoplankton/chemistry/*metabolism ; Seawater/*chemistry
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  • 28
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    Nature Publishing Group (NPG)
    Publication Date: 2011-01-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2011 Jan 6;469(7328):23-5. doi: 10.1038/469023a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21209640" target="_blank"〉PubMed〈/a〉
    Keywords: Biomimetics/trends ; Biopolymers/chemistry ; Chemistry/methods/*trends ; Conservation of Energy Resources/trends ; Drug Design ; Ecology/trends ; Global Warming ; Green Chemistry Technology/trends ; Molecular Biology/trends ; Nanotechnology/trends ; Photosynthesis ; Research Personnel ; Solar Energy ; Stereoisomerism ; Thermodynamics
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  • 29
    Publication Date: 2012-08-04
    Description: The warmest global climates of the past 65 million years occurred during the early Eocene epoch (about 55 to 48 million years ago), when the Equator-to-pole temperature gradients were much smaller than today and atmospheric carbon dioxide levels were in excess of one thousand parts per million by volume. Recently the early Eocene has received considerable interest because it may provide insight into the response of Earth's climate and biosphere to the high atmospheric carbon dioxide levels that are expected in the near future as a consequence of unabated anthropogenic carbon emissions. Climatic conditions of the early Eocene 'greenhouse world', however, are poorly constrained in critical regions, particularly Antarctica. Here we present a well-dated record of early Eocene climate on Antarctica from an ocean sediment core recovered off the Wilkes Land coast of East Antarctica. The information from biotic climate proxies (pollen and spores) and independent organic geochemical climate proxies (indices based on branched tetraether lipids) yields quantitative, seasonal temperature reconstructions for the early Eocene greenhouse world on Antarctica. We show that the climate in lowland settings along the Wilkes Land coast (at a palaeolatitude of about 70 degrees south) supported the growth of highly diverse, near-tropical forests characterized by mesothermal to megathermal floral elements including palms and Bombacoideae. Notably, winters were extremely mild (warmer than 10 degrees C) and essentially frost-free despite polar darkness, which provides a critical new constraint for the validation of climate models and for understanding the response of high-latitude terrestrial ecosystems to increased carbon dioxide forcing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pross, Jorg -- Contreras, Lineth -- Bijl, Peter K -- Greenwood, David R -- Bohaty, Steven M -- Schouten, Stefan -- Bendle, James A -- Rohl, Ursula -- Tauxe, Lisa -- Raine, J Ian -- Huck, Claire E -- van de Flierdt, Tina -- Jamieson, Stewart S R -- Stickley, Catherine E -- van de Schootbrugge, Bas -- Escutia, Carlota -- Brinkhuis, Henk -- Integrated Ocean Drilling Program Expedition 318 Scientists -- England -- Nature. 2012 Aug 2;488(7409):73-7. doi: 10.1038/nature11300.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Paleoenvironmental Dynamics Group, Institute of Geosciences, Goethe University Frankfurt, Altenhoferallee 1, 60438 Frankfurt, Germany. joerg.pross@em.uni-frankfurt.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22859204" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antarctic Regions ; Atmosphere/chemistry ; Carbon Dioxide/analysis ; Cell Respiration ; Ecosystem ; Geologic Sediments/chemistry ; Greenhouse Effect/*history ; History, Ancient ; Human Activities ; Lipids/analysis ; Models, Theoretical ; Photosynthesis ; Pollen ; Reproducibility of Results ; Seasons ; Spores/isolation & purification ; *Temperature ; Trees/growth & development ; *Tropical Climate
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  • 30
    Publication Date: 2013-10-25
    Description: Globally, reef-building corals are the most prolific producers of dimethylsulphoniopropionate (DMSP), a central molecule in the marine sulphur cycle and precursor of the climate-active gas dimethylsulphide. At present, DMSP production by corals is attributed entirely to their algal endosymbiont, Symbiodinium. Combining chemical, genomic and molecular approaches, we show that coral juveniles produce DMSP in the absence of algal symbionts. DMSP levels increased up to 54% over time in newly settled coral juveniles lacking algal endosymbionts, and further increases, up to 76%, were recorded when juveniles were subjected to thermal stress. We uncovered coral orthologues of two algal genes recently identified in DMSP biosynthesis, strongly indicating that corals possess the enzymatic machinery necessary for DMSP production. Our results overturn the paradigm that photosynthetic organisms are the sole biological source of DMSP, and highlight the double jeopardy represented by worldwide declining coral cover, as the potential to alleviate thermal stress through coral-produced DMSP declines correspondingly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raina, Jean-Baptiste -- Tapiolas, Dianne M -- Foret, Sylvain -- Lutz, Adrian -- Abrego, David -- Ceh, Janja -- Seneca, Francois O -- Clode, Peta L -- Bourne, David G -- Willis, Bette L -- Motti, Cherie A -- England -- Nature. 2013 Oct 31;502(7473):677-80. doi: 10.1038/nature12677. Epub 2013 Oct 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] AIMS@JCU, and School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia [2] Australian Institute of Marine Science, PMB3, Townsville MC, Townsville, Queensland 4810, Australia [3] ARC Centre of Excellence for Coral Reef Studies, School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24153189" target="_blank"〉PubMed〈/a〉
    Keywords: Acrylates/analysis/metabolism ; Algal Proteins/genetics ; Animals ; Anthozoa/genetics/metabolism/*physiology ; Climate Change ; Photosynthesis ; Secondary Metabolism ; *Stress, Physiological ; Sulfonium Compounds/*metabolism ; Symbiosis ; *Temperature ; Time Factors
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  • 31
    Publication Date: 2013-04-02
    Description: Meristems encompass stem/progenitor cells that sustain postembryonic growth of all plant organs. How meristems are activated and sustained by nutrient signalling remains enigmatic in photosynthetic plants. Combining chemical manipulations and chemical genetics at the photoautotrophic transition checkpoint, we reveal that shoot photosynthesis-derived glucose drives target-of-rapamycin (TOR) signalling relays through glycolysis and mitochondrial bioenergetics to control root meristem activation, which is decoupled from direct glucose sensing, growth-hormone signalling and stem-cell maintenance. Surprisingly, glucose-TOR signalling dictates transcriptional reprogramming of remarkable gene sets involved in central and secondary metabolism, cell cycle, transcription, signalling, transport and protein folding. Systems, cellular and genetic analyses uncover TOR phosphorylation of E2Fa transcription factor for an unconventional activation of S-phase genes, and glucose-signalling defects in e2fa root meristems. Our findings establish pivotal roles of glucose-TOR signalling in unprecedented transcriptional networks wiring central metabolism and biosynthesis for energy and biomass production, and integrating localized stem/progenitor-cell proliferation through inter-organ nutrient coordination to control developmental transition and growth.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4140196/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4140196/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xiong, Yan -- McCormack, Matthew -- Li, Lei -- Hall, Qi -- Xiang, Chengbin -- Sheen, Jen -- R01 GM060493/GM/NIGMS NIH HHS/ -- R01 GM070567/GM/NIGMS NIH HHS/ -- England -- Nature. 2013 Apr 11;496(7444):181-6. doi: 10.1038/nature12030. Epub 2013 Mar 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Centre for Computational and Integrative Biology, Massachusetts General Hospital, and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA. xiong@molbio.mgh.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23542588" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/*genetics/growth & development/*metabolism ; Arabidopsis Proteins/*metabolism ; Cytokinins/metabolism ; E2F Transcription Factors/metabolism ; Enzyme Activation ; *Gene Expression Regulation, Plant ; Gene Regulatory Networks/genetics ; Glucose/*metabolism ; Indoleacetic Acids/metabolism ; Meristem/genetics/growth & development/*metabolism ; Phosphatidylinositol 3-Kinases/*metabolism ; Phosphorylation ; Photosynthesis ; S Phase/genetics ; *Signal Transduction ; Transcription, Genetic/genetics ; Transcriptional Activation ; *Transcriptome/genetics
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  • 32
    Publication Date: 2013-04-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schiermeier, Quirin -- England -- Nature. 2013 Apr 11;496(7444):147. doi: 10.1038/496147a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23579654" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Carbon Cycle ; Carbon Dioxide/*analysis/metabolism ; Carbon Sequestration ; Cell Respiration ; Congresses as Topic ; Droughts/statistics & numerical data ; Extreme Heat ; Feedback ; Greenhouse Effect/*statistics & numerical data ; Models, Theoretical ; Photosynthesis ; Plants/metabolism ; Soil Microbiology ; Water/metabolism ; *Weather
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  • 33
    Publication Date: 2013-09-27
    Description: It is widely assumed that atmospheric oxygen concentrations remained persistently low (less than 10(-5) times present levels) for about the first 2 billion years of Earth's history. The first long-term oxygenation of the atmosphere is thought to have taken place around 2.3 billion years ago, during the Great Oxidation Event. Geochemical indications of transient atmospheric oxygenation, however, date back to 2.6-2.7 billion years ago. Here we examine the distribution of chromium isotopes and redox-sensitive metals in the approximately 3-billion-year-old Nsuze palaeosol and in the near-contemporaneous Ijzermyn iron formation from the Pongola Supergroup, South Africa. We find extensive mobilization of redox-sensitive elements through oxidative weathering. Furthermore, using our data we compute a best minimum estimate for atmospheric oxygen concentrations at that time of 3 x 10(-4) times present levels. Overall, our findings suggest that there were appreciable levels of atmospheric oxygen about 3 billion years ago, more than 600 million years before the Great Oxidation Event and some 300-400 million years earlier than previous indications for Earth surface oxygenation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crowe, Sean A -- Dossing, Lasse N -- Beukes, Nicolas J -- Bau, Michael -- Kruger, Stephanus J -- Frei, Robert -- Canfield, Donald E -- England -- Nature. 2013 Sep 26;501(7468):535-8. doi: 10.1038/nature12426.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biology, University of Southern Denmark, Odense 5230, Denmark. sean.crowe@ubc.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24067713" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/*chemistry ; Biological Evolution ; Chromium Isotopes/analysis ; Cyanobacteria/metabolism ; Earth (Planet) ; Geologic Sediments/analysis/chemistry ; History, Ancient ; Iron/analysis ; Oxidation-Reduction ; Oxygen/*analysis/metabolism ; Photosynthesis ; South Africa
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  • 34
    Publication Date: 2014-02-07
    Description: The seasonality of sunlight and rainfall regulates net primary production in tropical forests. Previous studies have suggested that light is more limiting than water for tropical forest productivity, consistent with greening of Amazon forests during the dry season in satellite data. We evaluated four potential mechanisms for the seasonal green-up phenomenon, including increases in leaf area or leaf reflectance, using a sophisticated radiative transfer model and independent satellite observations from lidar and optical sensors. Here we show that the apparent green up of Amazon forests in optical remote sensing data resulted from seasonal changes in near-infrared reflectance, an artefact of variations in sun-sensor geometry. Correcting this bidirectional reflectance effect eliminated seasonal changes in surface reflectance, consistent with independent lidar observations and model simulations with unchanging canopy properties. The stability of Amazon forest structure and reflectance over seasonal timescales challenges the paradigm of light-limited net primary production in Amazon forests and enhanced forest growth during drought conditions. Correcting optical remote sensing data for artefacts of sun-sensor geometry is essential to isolate the response of global vegetation to seasonal and interannual climate variability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morton, Douglas C -- Nagol, Jyoteshwar -- Carabajal, Claudia C -- Rosette, Jacqueline -- Palace, Michael -- Cook, Bruce D -- Vermote, Eric F -- Harding, David J -- North, Peter R J -- England -- Nature. 2014 Feb 13;506(7487):221-4. doi: 10.1038/nature13006. Epub 2014 Feb 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. ; 1] University of Maryland, College Park, Department of Geographical Sciences, College Park, Maryland 20742, USA [2] Global Land Cover Facility, College Park, Maryland 20740, USA. ; 1] NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA [2] Sigma Space Corporation, Lantham, Maryland 20706, USA. ; 1] NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA [2] University of Maryland, College Park, Department of Geographical Sciences, College Park, Maryland 20742, USA [3] Swansea University, Department of Geography, Singleton Park, Swansea SA2 8PP, UK. ; Earth System Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA. ; Swansea University, Department of Geography, Singleton Park, Swansea SA2 8PP, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24499816" target="_blank"〉PubMed〈/a〉
    Keywords: Artifacts ; Brazil ; Color ; *Droughts ; Ecosystem ; Fresh Water/analysis ; Models, Biological ; Photosynthesis ; Pigmentation/*physiology ; Plant Leaves/anatomy & histology/growth & development/*physiology ; Rain ; Satellite Imagery ; *Seasons ; *Sunlight ; Trees/anatomy & histology/growth & development/*physiology ; *Tropical Climate
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  • 35
    Publication Date: 2015-03-04
    Description: The climatic impact of CO2 and other greenhouse gases is usually quantified in terms of radiative forcing, calculated as the difference between estimates of the Earth's radiation field from pre-industrial and present-day concentrations of these gases. Radiative transfer models calculate that the increase in CO2 since 1750 corresponds to a global annual-mean radiative forcing at the tropopause of 1.82 +/- 0.19 W m(-2) (ref. 2). However, despite widespread scientific discussion and modelling of the climate impacts of well-mixed greenhouse gases, there is little direct observational evidence of the radiative impact of increasing atmospheric CO2. Here we present observationally based evidence of clear-sky CO2 surface radiative forcing that is directly attributable to the increase, between 2000 and 2010, of 22 parts per million atmospheric CO2. The time series of this forcing at the two locations-the Southern Great Plains and the North Slope of Alaska-are derived from Atmospheric Emitted Radiance Interferometer spectra together with ancillary measurements and thoroughly corroborated radiative transfer calculations. The time series both show statistically significant trends of 0.2 W m(-2) per decade (with respective uncertainties of +/-0.06 W m(-2) per decade and +/-0.07 W m(-2) per decade) and have seasonal ranges of 0.1-0.2 W m(-2). This is approximately ten per cent of the trend in downwelling longwave radiation. These results confirm theoretical predictions of the atmospheric greenhouse effect due to anthropogenic emissions, and provide empirical evidence of how rising CO2 levels, mediated by temporal variations due to photosynthesis and respiration, are affecting the surface energy balance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feldman, D R -- Collins, W D -- Gero, P J -- Torn, M S -- Mlawer, E J -- Shippert, T R -- England -- Nature. 2015 Mar 19;519(7543):339-43. doi: 10.1038/nature14240. Epub 2015 Feb 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lawrence Berkeley National Laboratory, Earth Sciences Division, 1 Cyclotron Road, MS 74R-316C, Berkeley, California 94720, USA. ; 1] Lawrence Berkeley National Laboratory, Earth Sciences Division, 1 Cyclotron Road, MS 74R-316C, Berkeley, California 94720, USA [2] University of California-Berkeley, Department of Earth and Planetary Science, 307 McCone Hall, MC 4767, Berkeley, California 94720, USA. ; University of Wisconsin-Madison, Space Science and Engineering Center, 1225 W. Dayton Street, Madison, Wisconsin 53706, USA. ; 1] Lawrence Berkeley National Laboratory, Earth Sciences Division, 1 Cyclotron Road, MS 74R-316C, Berkeley, California 94720, USA [2] University of California-Berkeley, Energy and Resources Group, Berkeley, 310 Barrows Hall, MC 3050, California 94720, USA. ; Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, Massachusetts 02141, USA. ; Pacific Northwest National Laboratory, Fundamental and Computational Sciences, 902 Battelle Boulevard, Richland, Washington 99354, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25731165" target="_blank"〉PubMed〈/a〉
    Keywords: Alaska ; Atmosphere/chemistry ; *Carbon Dioxide/analysis ; Cell Respiration ; Greenhouse Effect/statistics & numerical data ; *Infrared Rays ; Models, Theoretical ; *Observation ; Photosynthesis ; Seasons ; Time Factors
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  • 36
    Publication Date: 2015-07-23
    Description: Atmospheric methane is the second most important greenhouse gas after carbon dioxide, and is responsible for about 20% of the global warming effect since pre-industrial times. Rice paddies are the largest anthropogenic methane source and produce 7-17% of atmospheric methane. Warm waterlogged soil and exuded nutrients from rice roots provide ideal conditions for methanogenesis in paddies with annual methane emissions of 25-100-million tonnes. This scenario will be exacerbated by an expansion in rice cultivation needed to meet the escalating demand for food in the coming decades. There is an urgent need to establish sustainable technologies for increasing rice production while reducing methane fluxes from rice paddies. However, ongoing efforts for methane mitigation in rice paddies are mainly based on farming practices and measures that are difficult to implement. Despite proposed strategies to increase rice productivity and reduce methane emissions, no high-starch low-methane-emission rice has been developed. Here we show that the addition of a single transcription factor gene, barley SUSIBA2 (refs 7, 8), conferred a shift of carbon flux to SUSIBA2 rice, favouring the allocation of photosynthates to aboveground biomass over allocation to roots. The altered allocation resulted in an increased biomass and starch content in the seeds and stems, and suppressed methanogenesis, possibly through a reduction in root exudates. Three-year field trials in China demonstrated that the cultivation of SUSIBA2 rice was associated with a significant reduction in methane emissions and a decrease in rhizospheric methanogen levels. SUSIBA2 rice offers a sustainable means of providing increased starch content for food production while reducing greenhouse gas emissions from rice cultivation. Approaches to increase rice productivity and reduce methane emissions as seen in SUSIBA2 rice may be particularly beneficial in a future climate with rising temperatures resulting in increased methane emissions from paddies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Su, J -- Hu, C -- Yan, X -- Jin, Y -- Chen, Z -- Guan, Q -- Wang, Y -- Zhong, D -- Jansson, C -- Wang, F -- Schnurer, A -- Sun, C -- England -- Nature. 2015 Jul 30;523(7562):602-6. doi: 10.1038/nature14673. Epub 2015 Jul 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China [2] Department of Plant Biology, Uppsala BioCenter, Linnean Center for Plant Biology, Swedish University of Agricultural Sciences, PO Box 7080, SE-75007 Uppsala, Sweden. ; Department of Plant Biology, Uppsala BioCenter, Linnean Center for Plant Biology, Swedish University of Agricultural Sciences, PO Box 7080, SE-75007 Uppsala, Sweden. ; 1] Department of Plant Biology, Uppsala BioCenter, Linnean Center for Plant Biology, Swedish University of Agricultural Sciences, PO Box 7080, SE-75007 Uppsala, Sweden [2] Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization, Hunan Agricultural University, Changsha 410128, China. ; Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China. ; The Environmental Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory, PO Box 999, K8-93 Richland, Washington 99352, USA. ; Department of Microbiology, Uppsala BioCenter, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26200336" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/methods/trends ; Atmosphere/chemistry ; Biomass ; Carbon Cycle ; China ; Conservation of Natural Resources/methods ; Food Supply/methods ; Genotype ; Global Warming/prevention & control ; Greenhouse Effect/*prevention & control ; Hordeum/*genetics ; Methane/biosynthesis/*metabolism ; Molecular Sequence Data ; Oryza/genetics/growth & development/*metabolism ; Phenotype ; Photosynthesis ; Plant Components, Aerial/metabolism ; Plant Proteins/genetics/*metabolism ; Plant Roots/metabolism ; Plants, Genetically Modified ; Rhizosphere ; Seeds/metabolism ; Starch/biosynthesis/*metabolism ; Transcription Factors/genetics/*metabolism
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  • 37
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    Nature Publishing Group (NPG)
    Publication Date: 2010-08-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petherick, Anna -- England -- Nature. 2010 Aug 5;466(7307):675. doi: 10.1038/466675a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20686543" target="_blank"〉PubMed〈/a〉
    Keywords: Ambystoma/*embryology ; Animals ; Chlorophyta/*physiology ; Female ; Oviducts/metabolism ; Ovum/growth & development/*metabolism ; Photosynthesis ; *Symbiosis
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  • 38
    Publication Date: 2011-08-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mayfield, Stephen -- Wong, P K -- England -- Nature. 2011 Aug 24;476(7361):402-3. doi: 10.1038/476402a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21866147" target="_blank"〉PubMed〈/a〉
    Keywords: *Biocatalysis ; Biochemical Processes ; Bioengineering/*methods ; Biofuels/*supply & distribution ; Biomass ; *Catalysis ; Chemical Engineering/*methods ; Conservation of Energy Resources/*methods ; Lignin/chemistry/metabolism ; Photosynthesis ; Saccharum/chemistry/metabolism ; Temperature ; Zea mays/chemistry/metabolism
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  • 39
    Publication Date: 2012-06-23
    Description: Ecosystem respiration is the biotic conversion of organic carbon to carbon dioxide by all of the organisms in an ecosystem, including both consumers and primary producers. Respiration exhibits an exponential temperature dependence at the subcellular and individual levels, but at the ecosystem level respiration can be modified by many variables including community abundance and biomass, which vary substantially among ecosystems. Despite its importance for predicting the responses of the biosphere to climate change, it is as yet unknown whether the temperature dependence of ecosystem respiration varies systematically between aquatic and terrestrial environments. Here we use the largest database of respiratory measurements yet compiled to show that the sensitivity of ecosystem respiration to seasonal changes in temperature is remarkably similar for diverse environments encompassing lakes, rivers, estuaries, the open ocean and forested and non-forested terrestrial ecosystems, with an average activation energy similar to that of the respiratory complex (approximately 0.65 electronvolts (eV)). By contrast, annual ecosystem respiration shows a substantially greater temperature dependence across aquatic (approximately 0.65 eV) versus terrestrial ecosystems (approximately 0.32 eV) that span broad geographic gradients in temperature. Using a model derived from metabolic theory, these findings can be reconciled by similarities in the biochemical kinetics of metabolism at the subcellular level, and fundamental differences in the importance of other variables besides temperature-such as primary productivity and allochthonous carbon inputs-on the structure of aquatic and terrestrial biota at the community level.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yvon-Durocher, Gabriel -- Caffrey, Jane M -- Cescatti, Alessandro -- Dossena, Matteo -- del Giorgio, Paul -- Gasol, Josep M -- Montoya, Jose M -- Pumpanen, Jukka -- Staehr, Peter A -- Trimmer, Mark -- Woodward, Guy -- Allen, Andrew P -- England -- Nature. 2012 Jul 26;487(7408):472-6. doi: 10.1038/nature11205.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biological & Chemical Sciences, Queen Mary University of London, London E1 4NS, UK. g.yvon-durocher@exeter.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22722862" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomass ; Biota ; Carbon/*metabolism ; Carbon Dioxide/*metabolism ; Cell Respiration ; Data Collection ; *Ecosystem ; *Global Warming ; Humans ; Kinetics ; Lakes ; Marine Biology ; *Oxygen Consumption ; Photosynthesis ; Rivers ; Seasons ; Seawater ; *Temperature ; Time Factors ; Trees/metabolism
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  • 40
    Publication Date: 2013-04-05
    Description: Renewable fresh water over continents has input from precipitation and losses to the atmosphere through evaporation and transpiration. Global-scale estimates of transpiration from climate models are poorly constrained owing to large uncertainties in stomatal conductance and the lack of catchment-scale measurements required for model calibration, resulting in a range of predictions spanning 20 to 65 per cent of total terrestrial evapotranspiration (14,000 to 41,000 km(3) per year) (refs 1, 2, 3, 4, 5). Here we use the distinct isotope effects of transpiration and evaporation to show that transpiration is by far the largest water flux from Earth's continents, representing 80 to 90 per cent of terrestrial evapotranspiration. On the basis of our analysis of a global data set of large lakes and rivers, we conclude that transpiration recycles 62,000 +/- 8,000 km(3) of water per year to the atmosphere, using half of all solar energy absorbed by land surfaces in the process. We also calculate CO2 uptake by terrestrial vegetation by connecting transpiration losses to carbon assimilation using water-use efficiency ratios of plants, and show the global gross primary productivity to be 129 +/- 32 gigatonnes of carbon per year, which agrees, within the uncertainty, with previous estimates. The dominance of transpiration water fluxes in continental evapotranspiration suggests that, from the point of view of water resource forecasting, climate model development should prioritize improvements in simulations of biological fluxes rather than physical (evaporation) fluxes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jasechko, Scott -- Sharp, Zachary D -- Gibson, John J -- Birks, S Jean -- Yi, Yi -- Fawcett, Peter J -- England -- Nature. 2013 Apr 18;496(7445):347-50. doi: 10.1038/nature11983. Epub 2013 Apr 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA. jasechko@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23552893" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Carbon Dioxide/analysis/metabolism ; Ecosystem ; Fresh Water/*analysis/chemistry ; Lakes ; Oceans and Seas ; Photosynthesis ; Plant Transpiration/*physiology ; Plants/*metabolism ; Rain ; Rivers ; Uncertainty ; Volatilization ; *Water Movements
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  • 41
    Publication Date: 2013-03-08
    Description: Geological evidence suggests that marine ice extended to the Equator at least twice during the Neoproterozoic era (about 750 to 635 million years ago), inspiring the Snowball Earth hypothesis that the Earth was globally ice-covered. In a possible Snowball Earth climate, ocean circulation and mixing processes would have set the melting and freezing rates that determine ice thickness, would have influenced the survival of photosynthetic life, and may provide important constraints for the interpretation of geochemical and sedimentological observations. Here we show that in a Snowball Earth, the ocean would have been well mixed and characterized by a dynamic circulation, with vigorous equatorial meridional overturning circulation, zonal equatorial jets, a well developed eddy field, strong coastal upwelling and convective mixing. This is in contrast to the sluggish ocean often expected in a Snowball Earth scenario owing to the insulation of the ocean from atmospheric forcing by the thick ice cover. As a result of vigorous convective mixing, the ocean temperature, salinity and density were either uniform in the vertical direction or weakly stratified in a few locations. Our results are based on a model that couples ice flow and ocean circulation, and is driven by a weak geothermal heat flux under a global ice cover about a kilometre thick. Compared with the modern ocean, the Snowball Earth ocean had far larger vertical mixing rates, and comparable horizontal mixing by ocean eddies. The strong circulation and coastal upwelling resulted in melting rates near continents as much as ten times larger than previously estimated. Although we cannot resolve the debate over the existence of global ice cover, we discuss the implications for the nutrient supply of photosynthetic activity and for banded iron formations. Our insights and constraints on ocean dynamics may help resolve the Snowball Earth controversy when combined with future geochemical and geological observations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ashkenazy, Yosef -- Gildor, Hezi -- Losch, Martin -- Macdonald, Francis A -- Schrag, Daniel P -- Tziperman, Eli -- England -- Nature. 2013 Mar 7;495(7439):90-3. doi: 10.1038/nature11894.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Solar Energy and Environmental Physics, The Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, 84990, Israel. ashkena@bgu.ac.il〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23467167" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Earth (Planet) ; History, Ancient ; *Ice Cover ; Models, Theoretical ; Oceans and Seas ; Photosynthesis ; Salinity ; *Seawater/analysis/chemistry ; *Snow ; Temperature ; *Water Movements
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  • 42
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    Nature Publishing Group (NPG)
    Publication Date: 2014-11-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dayton, Leigh -- England -- Nature. 2014 Oct 30;514(7524):S52-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25368887" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/*methods/trends ; Australia ; Biotechnology/*trends ; Crops, Agricultural/genetics/growth & development/microbiology/supply & ; distribution ; Fertilizers ; Food Supply ; Nitrogen/metabolism ; Oryza/*genetics/growth & development/microbiology/*supply & distribution ; Photosynthesis ; Plant Diseases/genetics/microbiology
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  • 43
    Publication Date: 2014-03-29
    Description: Methane (CH4) is an important greenhouse gas because it has 25 times the global warming potential of carbon dioxide (CO2) by mass over a century. Recent calculations suggest that atmospheric CH4 emissions have been responsible for approximately 20% of Earth's warming since pre-industrial times. Understanding how CH4 emissions from ecosystems will respond to expected increases in global temperature is therefore fundamental to predicting whether the carbon cycle will mitigate or accelerate climate change. Methanogenesis is the terminal step in the remineralization of organic matter and is carried out by strictly anaerobic Archaea. Like most other forms of metabolism, methanogenesis is temperature-dependent. However, it is not yet known how this physiological response combines with other biotic processes (for example, methanotrophy, substrate supply, microbial community composition) and abiotic processes (for example, water-table depth) to determine the temperature dependence of ecosystem-level CH4 emissions. It is also not known whether CH4 emissions at the ecosystem level have a fundamentally different temperature dependence than other key fluxes in the carbon cycle, such as photosynthesis and respiration. Here we use meta-analyses to show that seasonal variations in CH4 emissions from a wide range of ecosystems exhibit an average temperature dependence similar to that of CH4 production derived from pure cultures of methanogens and anaerobic microbial communities. This average temperature dependence (0.96 electron volts (eV)), which corresponds to a 57-fold increase between 0 and 30 degrees C, is considerably higher than previously observed for respiration (approximately 0.65 eV) and photosynthesis (approximately 0.3 eV). As a result, we show that both the emission of CH4 and the ratio of CH4 to CO2 emissions increase markedly with seasonal increases in temperature. Our findings suggest that global warming may have a large impact on the relative contributions of CO2 and CH4 to total greenhouse gas emissions from aquatic ecosystems, terrestrial wetlands and rice paddies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yvon-Durocher, Gabriel -- Allen, Andrew P -- Bastviken, David -- Conrad, Ralf -- Gudasz, Cristian -- St-Pierre, Annick -- Thanh-Duc, Nguyen -- del Giorgio, Paul A -- England -- Nature. 2014 Mar 27;507(7493):488-91. doi: 10.1038/nature13164. Epub 2014 Mar 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, TR10 9EZ. UK. ; Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia. ; Department of Thematic Studies - Water and Environmental Studies, Linkoping University, SE-581 83 Linkoping, Sweden. ; Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, 35043 Marburg, Germany. ; 1] Department of Ecology and Environmental Sciences, Umea University, Linnaeus vag 6, SE-901 87 Umea, Sweden [2] Department of Ecology and Genetics, Limnology, Uppsala University, Norbyvagen 18D, SE-752 36, Uppsala Sweden [3] Department of Ecology and Evolutionary Biology, Princeton University, Princeton, 106A Guyot Hall, New Jersey 08544, USA. ; Departement des sciences biologiques, Universite du Quebec a Montreal, Montreal, Province of Quebec, H2X 3X8, Canada. ; Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire 03824, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24670769" target="_blank"〉PubMed〈/a〉
    Keywords: Anaerobiosis ; Aquatic Organisms/metabolism ; Archaea/*metabolism ; Atmosphere/chemistry ; Carbon Cycle ; Carbon Dioxide/analysis ; Cell Respiration ; *Ecosystem ; Geologic Sediments/microbiology ; *Global Warming ; Greenhouse Effect ; Methane/analysis/*metabolism ; Oryza/metabolism ; Photosynthesis ; Seasons ; *Temperature ; Wetlands
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  • 44
    Publication Date: 2014-06-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morello, Lauren -- England -- Nature. 2014 Jun 26;510(7506):451-2. doi: 10.1038/510451a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24965628" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Carbon Dioxide/*analysis ; Environmental Monitoring/*instrumentation ; Fossil Fuels ; *Geographic Mapping ; *Greenhouse Effect ; Luminescent Measurements/instrumentation ; Photosynthesis ; Plants/metabolism ; Satellite Imagery/*instrumentation ; United States ; United States National Aeronautics and Space Administration
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  • 45
    Publication Date: 2014-02-07
    Description: Feedbacks between land carbon pools and climate provide one of the largest sources of uncertainty in our predictions of global climate. Estimates of the sensitivity of the terrestrial carbon budget to climate anomalies in the tropics and the identification of the mechanisms responsible for feedback effects remain uncertain. The Amazon basin stores a vast amount of carbon, and has experienced increasingly higher temperatures and more frequent floods and droughts over the past two decades. Here we report seasonal and annual carbon balances across the Amazon basin, based on carbon dioxide and carbon monoxide measurements for the anomalously dry and wet years 2010 and 2011, respectively. We find that the Amazon basin lost 0.48 +/- 0.18 petagrams of carbon per year (Pg C yr(-1)) during the dry year but was carbon neutral (0.06 +/- 0.1 Pg C yr(-1)) during the wet year. Taking into account carbon losses from fire by using carbon monoxide measurements, we derived the basin net biome exchange (that is, the carbon flux between the non-burned forest and the atmosphere) revealing that during the dry year, vegetation was carbon neutral. During the wet year, vegetation was a net carbon sink of 0.25 +/- 0.14 Pg C yr(-1), which is roughly consistent with the mean long-term intact-forest biomass sink of 0.39 +/- 0.10 Pg C yr(-1) previously estimated from forest censuses. Observations from Amazonian forest plots suggest the suppression of photosynthesis during drought as the primary cause for the 2010 sink neutralization. Overall, our results suggest that moisture has an important role in determining the Amazonian carbon balance. If the recent trend of increasing precipitation extremes persists, the Amazon may become an increasing carbon source as a result of both emissions from fires and the suppression of net biome exchange by drought.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gatti, L V -- Gloor, M -- Miller, J B -- Doughty, C E -- Malhi, Y -- Domingues, L G -- Basso, L S -- Martinewski, A -- Correia, C S C -- Borges, V F -- Freitas, S -- Braz, R -- Anderson, L O -- Rocha, H -- Grace, J -- Phillips, O L -- Lloyd, J -- England -- Nature. 2014 Feb 6;506(7486):76-80. doi: 10.1038/nature12957.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Instituto de Pesquisas Energeticas e Nucleares (IPEN)-Comissao Nacional de Energia Nuclear (CNEN)-Atmospheric Chemistry Laboratory, 2242 Avenida Professor Lineu Prestes, Cidade Universitaria, Sao Paulo CEP 05508-000, Brazil [2]. ; 1] School of Geography, University of Leeds, Woodhouse Lane, Leeds LS9 2JT, UK [2]. ; 1] Global Monitoring Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305, USA [2] Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, USA [3]. ; Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK. ; Instituto de Pesquisas Energeticas e Nucleares (IPEN)-Comissao Nacional de Energia Nuclear (CNEN)-Atmospheric Chemistry Laboratory, 2242 Avenida Professor Lineu Prestes, Cidade Universitaria, Sao Paulo CEP 05508-000, Brazil. ; Center for Weather Forecasts and Climate Studies, Instituto Nacional de Pesquisas Espaciais (INPE), Rodovia Dutra, km 39, Cachoeira Paulista CEP 12630-000, Brazil. ; 1] Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK [2] Remote Sensing Division, INPE (National Institute for Space Research), 1758 Avenida dos Astronautas, Sao Jose dos Campos CEP 12227-010, Brazil. ; Departamento de Ciencias Atmosfericas/Instituto de Astronomia e Geofisica (IAG)/Universidade de Sao Paulo, 1226 Rua do Matao, Cidade Universitaria, Sao Paulo CEP 05508-090, Brazil. ; Crew Building, The King's Buildings, West Mains Road, Edinburgh EH9 3JN, UK. ; School of Geography, University of Leeds, Woodhouse Lane, Leeds LS9 2JT, UK. ; 1] School of Tropical and Marine Biology and Centre for Terrestrial Environmental and Sustainability Sciences, James Cook University, Cairns 4870, Queensland, Australia [2] Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot SL5 7PY, Berkshire, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24499918" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/*chemistry ; Biomass ; Biota ; Brazil ; *Carbon Cycle ; Carbon Dioxide/analysis ; Carbon Monoxide/analysis ; Droughts/*statistics & numerical data ; Fires/statistics & numerical data ; Fresh Water/analysis ; Photosynthesis ; Rain ; Seasons ; Trees/metabolism ; Tropical Climate
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  • 46
    Publication Date: 2015-05-29
    Description: Interactions between primary producers and bacteria impact the physiology of both partners, alter the chemistry of their environment, and shape ecosystem diversity. In marine ecosystems, these interactions are difficult to study partly because the major photosynthetic organisms are microscopic, unicellular phytoplankton. Coastal phytoplankton communities are dominated by diatoms, which generate approximately 40% of marine primary production and form the base of many marine food webs. Diatoms co-occur with specific bacterial taxa, but the mechanisms of potential interactions are mostly unknown. Here we tease apart a bacterial consortium associated with a globally distributed diatom and find that a Sulfitobacter species promotes diatom cell division via secretion of the hormone indole-3-acetic acid, synthesized by the bacterium using both diatom-secreted and endogenous tryptophan. Indole-3-acetic acid and tryptophan serve as signalling molecules that are part of a complex exchange of nutrients, including diatom-excreted organosulfur molecules and bacterial-excreted ammonia. The potential prevalence of this mode of signalling in the oceans is corroborated by metabolite and metatranscriptome analyses that show widespread indole-3-acetic acid production by Sulfitobacter-related bacteria, particularly in coastal environments. Our study expands on the emerging recognition that marine microbial communities are part of tightly connected networks by providing evidence that these interactions are mediated through production and exchange of infochemicals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amin, S A -- Hmelo, L R -- van Tol, H M -- Durham, B P -- Carlson, L T -- Heal, K R -- Morales, R L -- Berthiaume, C T -- Parker, M S -- Djunaedi, B -- Ingalls, A E -- Parsek, M R -- Moran, M A -- Armbrust, E V -- England -- Nature. 2015 Jun 4;522(7554):98-101. doi: 10.1038/nature14488. Epub 2015 May 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] School of Oceanography, University of Washington, Seattle, Washington 98195, USA [2] Chemistry Faculty, New York University Abu Dhabi, PO Box 129188, Abu Dhabi, United Arab Emirates. ; Department of Microbiology, University of Washington, Seattle, Washington 98195, USA. ; School of Oceanography, University of Washington, Seattle, Washington 98195, USA. ; Department of Microbiology, University of Georgia, Athens, Georgia 30602, USA. ; Department of Marine Science, University of Georgia, Athens, Georgia 30602, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26017307" target="_blank"〉PubMed〈/a〉
    Keywords: Diatoms/cytology/genetics/*metabolism/*microbiology ; *Ecosystem ; Indoleacetic Acids/*metabolism ; Metabolomics ; Molecular Sequence Data ; Oceans and Seas ; Photosynthesis ; Phytoplankton/cytology/genetics/*metabolism/*microbiology ; Rhodobacteraceae/genetics/*metabolism ; Seawater/chemistry ; Transcriptome ; Tryptophan/metabolism
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  • 47
    Publication Date: 2016-04-21
    Description: Planktonic organisms play crucial roles in oceanic food webs and global biogeochemical cycles. Most of our knowledge about the ecological impact of large zooplankton stems from research on abundant and robust crustaceans, and in particular copepods. A number of the other organisms that comprise planktonic communities are fragile, and therefore hard to sample and quantify, meaning that their abundances and effects on oceanic ecosystems are poorly understood. Here, using data from a worldwide in situ imaging survey of plankton larger than 600 mum, we show that a substantial part of the biomass of this size fraction consists of giant protists belonging to the Rhizaria, a super-group of mostly fragile unicellular marine organisms that includes the taxa Phaeodaria and Radiolaria (for example, orders Collodaria and Acantharia). Globally, we estimate that rhizarians in the top 200 m of world oceans represent a standing stock of 0.089 Pg carbon, equivalent to 5.2% of the total oceanic biota carbon reservoir. In the vast oligotrophic intertropical open oceans, rhizarian biomass is estimated to be equivalent to that of all other mesozooplankton (plankton in the size range 0.2-20 mm). The photosymbiotic association of many rhizarians with microalgae may be an important factor in explaining their distribution. The previously overlooked importance of these giant protists across the widest ecosystem on the planet changes our understanding of marine planktonic ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Biard, Tristan -- Stemmann, Lars -- Picheral, Marc -- Mayot, Nicolas -- Vandromme, Pieter -- Hauss, Helena -- Gorsky, Gabriel -- Guidi, Lionel -- Kiko, Rainer -- Not, Fabrice -- England -- Nature. 2016 Apr 28;532(7600):504-7. doi: 10.1038/nature17652. Epub 2016 Apr 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sorbonne Universites, UPMC Universite Paris 06, CNRS, Laboratoire Adaptation et Diversite en Milieu Marin UMR7144, Station Biologique de Roscoff, 29688 Roscoff, France. ; Sorbonne Universites, UPMC Universite Paris 06, CNRS, Laboratoire d'Oceanographie de Villefranche (LOV) UMR7093, Observatoire Oceanologique, 06230 Villefranche-sur-Mer, France. ; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, 24148 Kiel, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27096373" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biomass ; *Biota ; Carbon/metabolism ; Carbon Sequestration ; Earth (Planet) ; Microalgae/metabolism ; *Oceans and Seas ; Photosynthesis ; Rhizaria/classification/*isolation & purification/metabolism ; Seawater/chemistry ; Symbiosis ; Zooplankton/classification/*isolation & purification/metabolism
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  • 48
    Publication Date: 2016-02-11
    Description: The biological carbon pump is the process by which CO2 is transformed to organic carbon via photosynthesis, exported through sinking particles, and finally sequestered in the deep ocean. While the intensity of the pump correlates with plankton community composition, the underlying ecosystem structure driving the process remains largely uncharacterized. Here we use environmental and metagenomic data gathered during the Tara Oceans expedition to improve our understanding of carbon export in the oligotrophic ocean. We show that specific plankton communities, from the surface and deep chlorophyll maximum, correlate with carbon export at 150 m and highlight unexpected taxa such as Radiolaria and alveolate parasites, as well as Synechococcus and their phages, as lineages most strongly associated with carbon export in the subtropical, nutrient-depleted, oligotrophic ocean. Additionally, we show that the relative abundance of a few bacterial and viral genes can predict a significant fraction of the variability in carbon export in these regions.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851848/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851848/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guidi, Lionel -- Chaffron, Samuel -- Bittner, Lucie -- Eveillard, Damien -- Larhlimi, Abdelhalim -- Roux, Simon -- Darzi, Youssef -- Audic, Stephane -- Berline, Leo -- Brum, Jennifer R -- Coelho, Luis Pedro -- Espinoza, Julio Cesar Ignacio -- Malviya, Shruti -- Sunagawa, Shinichi -- Dimier, Celine -- Kandels-Lewis, Stefanie -- Picheral, Marc -- Poulain, Julie -- Searson, Sarah -- Tara Oceans Consortium Coordinators -- Stemmann, Lars -- Not, Fabrice -- Hingamp, Pascal -- Speich, Sabrina -- Follows, Mick -- Karp-Boss, Lee -- Boss, Emmanuel -- Ogata, Hiroyuki -- Pesant, Stephane -- Weissenbach, Jean -- Wincker, Patrick -- Acinas, Silvia G -- Bork, Peer -- de Vargas, Colomban -- Iudicone, Daniele -- Sullivan, Matthew B -- Raes, Jeroen -- Karsenti, Eric -- Bowler, Chris -- Gorsky, Gabriel -- England -- Nature. 2016 Apr 28;532(7600):465-70. doi: 10.1038/nature16942. Epub 2016 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sorbonne Universites, UPMC Universite Paris 06, CNRS, Laboratoire d'oceanographie de Villefranche (LOV), Observatoire Oceanologique, 06230 Villefranche-sur-Mer, France. ; Department of Oceanography, University of Hawaii, Honolulu, Hawaii 96822, USA. ; Department of Microbiology and Immunology, Rega Institute, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. ; Center for the Biology of Disease, VIB, Herestraat 49, 3000 Leuven, Belgium. ; Department of Applied Biological Sciences, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium. ; Sorbonne Universites, UPMC Univ Paris 06, CNRS, Institut de Biologie Paris-Seine (IBPS), Evolution Paris Seine, F-75005, Paris, France. ; Ecole Normale Superieure, PSL Research University, Institut de Biologie de l'Ecole Normale Superieure (IBENS), CNRS UMR 8197, INSERM U1024, 46 rue d'Ulm, F-75005 Paris, France. ; Sorbonne Universites, UPMC Universite Paris 06, CNRS, Laboratoire Adaptation et Diversite en Milieu Marin, Station Biologique de Roscoff, 29680 Roscoff, France. ; LINA UMR 6241, Universite de Nantes, EMN, CNRS, 44322 Nantes, France. ; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA. ; Structural and Computational Biology, European Molecular Biology Laboratory, Meyerhofstr. 1, 69117 Heidelberg, Germany. ; Directors' Research European Molecular Biology Laboratory Meyerhofstr. 1, 69117 Heidelberg, Germany. ; CEA - Institut de Genomique, GENOSCOPE, 2 rue Gaston Cremieux, 91057 Evry, France. ; Aix Marseille Universite, CNRS, IGS, UMR 7256, 13288 Marseille, France. ; Department of Geosciences, Laboratoire de Meteorologie Dynamique (LMD), Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris CEDEX 05, France. ; Dept of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. ; School of Marine Sciences, University of Maine, Orono, Maine 04469, USA. ; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan. ; PANGAEA, Data Publisher for Earth and Environmental Science, University of Bremen, 28359 Bremen, Germany. ; MARUM, Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany. ; CNRS, UMR 8030, CP 5706 Evry, France. ; Universite d'Evry, UMR 8030, CP 5706 Evry, France. ; Department of Marine Biology and Oceanography, Institute of Marine Sciences (ICM)-CSIC, Pg. Maritim de la Barceloneta 37-49, Barcelona E0800, Spain. ; Max-Delbruck-Centre for Molecular Medicine, 13092 Berlin, Germany. ; Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863193" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/genetics/isolation & purification/*metabolism ; Carbon/*metabolism ; Chlorophyll/metabolism ; Dinoflagellida/genetics/isolation & purification/metabolism ; *Ecosystem ; Expeditions ; Genes, Bacterial ; Genes, Viral ; Geography ; Oceans and Seas ; Photosynthesis ; Plankton/genetics/isolation & purification/*metabolism ; Seawater/*chemistry/microbiology/parasitology ; Synechococcus/genetics/isolation & purification/metabolism/virology
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  • 49
    Publication Date: 2016-03-17
    Description: Plant respiration results in an annual flux of carbon dioxide (CO2) to the atmosphere that is six times as large as that due to the emissions from fossil fuel burning, so changes in either will impact future climate. As plant respiration responds positively to temperature, a warming world may result in additional respiratory CO2 release, and hence further atmospheric warming. Plant respiration can acclimate to altered temperatures, however, weakening the positive feedback of plant respiration to rising global air temperature, but a lack of evidence on long-term (weeks to years) acclimation to climate warming in field settings currently hinders realistic predictions of respiratory release of CO2 under future climatic conditions. Here we demonstrate strong acclimation of leaf respiration to both experimental warming and seasonal temperature variation for juveniles of ten North American tree species growing for several years in forest conditions. Plants grown and measured at 3.4 degrees C above ambient temperature increased leaf respiration by an average of 5% compared to plants grown and measured at ambient temperature; without acclimation, these increases would have been 23%. Thus, acclimation eliminated 80% of the expected increase in leaf respiration of non-acclimated plants. Acclimation of leaf respiration per degree temperature change was similar for experimental warming and seasonal temperature variation. Moreover, the observed increase in leaf respiration per degree increase in temperature was less than half as large as the average reported for previous studies, which were conducted largely over shorter time scales in laboratory settings. If such dampening effects of leaf thermal acclimation occur generally, the increase in respiration rates of terrestrial plants in response to climate warming may be less than predicted, and thus may not raise atmospheric CO2 concentrations as much as anticipated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reich, Peter B -- Sendall, Kerrie M -- Stefanski, Artur -- Wei, Xiaorong -- Rich, Roy L -- Montgomery, Rebecca A -- England -- Nature. 2016 Mar 31;531(7596):633-6. doi: 10.1038/nature17142. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Forest Resources, University of Minnesota, Minnesota 55108, USA. ; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales 2753, Australia. ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China. ; Smithsonian Environmental Research Center, Edgewater, Maryland 20137, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982730" target="_blank"〉PubMed〈/a〉
    Keywords: *Acclimatization ; Atmosphere ; Carbon Dioxide/metabolism ; Cell Respiration ; Darkness ; *Ecosystem ; Forests ; *Global Warming ; North America ; Photosynthesis ; Plant Leaves/metabolism ; Seasons ; *Temperature ; Time Factors ; Trees/classification/*metabolism
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  • 50
    Publication Date: 2015-12-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rohwer, Forest -- Segall, Anca M -- England -- Nature. 2015 Dec 3;528(7580):46-8. doi: 10.1038/528046a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Viral Information Institute, Department of Biology, San Diego State University, San Diego, California 92182, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26632584" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacteriophages/genetics/immunology/pathogenicity/physiology ; CRISPR-Cas Systems/genetics ; Cyanobacteria/genetics/metabolism/virology ; Evolution, Molecular ; Gene Transfer, Horizontal/genetics ; Genome, Viral/genetics ; History, 20th Century ; History, 21st Century ; Host-Pathogen Interactions/genetics ; Humans ; Molecular Biology/*history ; Mutagenesis/genetics ; Neoplasms/genetics/pathology ; Oncogenes/genetics ; Photosynthesis ; Sequence Analysis, DNA/history ; Synthetic Biology/trends
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 51
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    FEBS Letters 296 (1992), S. 29-32 
    ISSN: 0014-5793
    Keywords: Electron microscopy ; Membrane protein ; Photosynthesis ; Photosystem 1 ; Synechococcus sp.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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    FEBS Letters 313 (1992), S. 75-79 
    ISSN: 0014-5793
    Keywords: Non-heme iron ; Photoinhibition ; Photosynthesis ; Photosystem II ; Spinacea oleracca
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  • 53
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    FEBS Letters 295 (1991), S. 155-158 
    ISSN: 0014-5793
    Keywords: Chloramphenicol ; Electron acceptor ; Inhibitor ; Photosynthesis ; Photosystem I
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  • 54
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    FEBS Letters 143 (1982), S. 45-48 
    ISSN: 0014-5793
    Keywords: Bilayer membranes ; Carotenoids ; Chlorophyll ; Electron transfer ; Pheophytin ; Photosynthesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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  • 55
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    FEBS Letters 283 (1991), S. 33-36 
    ISSN: 0014-5793
    Keywords: Electrochemistry ; Electron transfer ; Photosynthesis ; Reaction center ; Redox potential
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  • 56
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    FEBS Letters 233 (1988), S. 413-416 
    ISSN: 0014-5793
    Keywords: 2-cary-D-arabinitol-1,5-bisphosphate ; 2-cary-D-arabinitol-1-phosphate ; CA1P ; CABP ; Caryarabinitol-1-phosphate ; PEP ; Photosynthesis ; Ribulose bisphosphate carylase ; RuBP ; Rubisco activase ; phosphoeno/pyruvate ; ribulose 1,5-bisphosphate ; ribulose 1,5-bisphosphate carylase/oxygenase ; rubisco
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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    ISSN: 0014-5793
    Keywords: Bacterial reaction center ; Fourier transform infrared spectroscopy ; Photosynthesis ; Primary quinone ; Secondary quinone
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    ISSN: 0014-5793
    Keywords: F-ATP synthase ; Photosynthesis ; Phylogeny ; Spinach ; Subunit CFo-II gene (atpG)
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  • 59
    ISSN: 0014-5793
    Keywords: Bacterial reaction center ; Fourier transform infrared spectroscopy ; Photosynthesis ; Primary quinone ; Secondary quinone ; Ubiquinone
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  • 60
    ISSN: 0014-5793
    Keywords: Conformational state ; Cytochrome oxidation ; Electron transfer ; Low temperature ; Photosynthesis ; Reaction center ; Rhodopseudomonas viridis
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    ISSN: 0014-5793
    Keywords: ADRY-agent ; Electron spin echo spectroscopy ; Manganese ; Oxygen evolving complex ; Photosynthesis ; Photosystem II
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    ISSN: 0014-5793
    Keywords: Glycinebetaine ; Oxygen evolution ; Photosynthesis ; Photosystem 2 complex ; Salt effect
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    ISSN: 0014-5793
    Keywords: Bacterial reaction centers ; Cytochrome ; Fourier transform infrared spectroscopy ; Photosynthesis ; Rhodopseudomonas viridis
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  • 64
    ISSN: 0014-5793
    Keywords: Chlorophyll fluorescence ; Light harvesting complex ; Photosynthesis ; Proton channel ; Thylakoid membrane
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    ISSN: 0014-5793
    Keywords: Bacterial reaction center ; Fourier transform infrared spectroscopy ; Photosynthesis ; Primary quinone ; Secondary quinone
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  • 66
    ISSN: 0014-5793
    Keywords: 2-(3-chloro-4-trifluoromethyl)anilino-3 ; 2-(N-morpholino)ethanesulfonic acid ; 5-dinitrothiophene ; ADRY ; ADRY-agent ; ANT2p ; BBY ; DMSO ; EPR ; ESE ; Electron spin echo spectroscopy ; MES ; Manganese ; OEC ; Oxygen evolving complex ; PPBQ ; PS II ; Photosynthesis ; Photosystem II ; acceleration of the deactivation reactions of the watersplitting enzyme ; dimethylsulfoxide ; electron paramagnetic resonance ; electron spin echo ; oxygen evolving complex ; phenyl-p-benzoquinone ; photosystem II of higher plants ; thylakoid membrane fragments prepared according to [10]
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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  • 67
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    Biophysical Chemistry 17 (1983), S. 211-244 
    ISSN: 0301-4622
    Keywords: Chlorophyll a ; Chlorophyll b ; Infrared specsroscopy ; Monolayer ; Multilayer ; Photosynthesis
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  • 68
    ISSN: 0301-4622
    Keywords: ATP synthesis inhibition ; Chloroplasts ; Decouplers ; Non-classical decoupling ; Photosynthesis ; Quinic acid ; Quinic acid complexes
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  • 69
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    Biosystems 19 (1986), S. 111-122 
    ISSN: 0303-2647
    Keywords: Control system ; Cybernetics ; Leaf analog ; Leaf growth ; Mathematical model ; Photosynthesis
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  • 70
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    Biosystems 25 (1991), S. 13-23 
    ISSN: 0303-2647
    Keywords: Carbon fixation ; Cyanobacteria ; Diurnal cycles ; Evolution ; Microbial mats ; Photosynthesis ; Stromatolites
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  • 71
    ISSN: 0304-3800
    Keywords: Empirical model ; Fagus sylvatica ; Photosynthesis ; Respiration ; Transpiration ; Tree growth
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  • 72
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    Ecological Modelling 73 (1994), S. 63-80 
    ISSN: 0304-3800
    Keywords: Andropogon gerardii ; C"4 grass ; CO"2 enrichment ; Photosynthesis ; Stomatal conductance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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  • 73
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    BBA Reviews On Bioenergetics 1099 (1992), S. 211-218 
    ISSN: 0304-4173
    Keywords: (Synechococcus) ; Manganese ; Oxygen evolution ; Photosynthesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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  • 74
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    BBA Reviews On Bioenergetics 1099 (1992), S. 267-270 
    ISSN: 0304-4173
    Keywords: (Cyanobacterium) ; Biliprotein ; Energy transfer ; Light harvesting ; Nitrogen storage ; Photosynthesis ; Phycoerythrin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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    ISSN: 0304-4173
    Keywords: (C. aurantiacus) ; Bacterial reaction center ; Fluorescence ; Photosynthesis ; Picosecond spectroscopy
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  • 76
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    BBA Reviews On Bioenergetics 1098 (1991), S. 68-78 
    ISSN: 0304-4173
    Keywords: (Synechococcus 6301) ; Cyanobacterium ; Excitation energy transfer ; Fluorescence decay ; Photosynthesis ; Photosystem II ; Phycobilisome
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
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  • 77
    ISSN: 0304-4211
    Keywords: Chlorophylls ; Euglena ; Herbicides ; Photosynthesis
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  • 78
    ISSN: 0304-4211
    Keywords: Green pepper ; Methionine sulfoximine ; Nitrogen ; Photosynthesis
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  • 79
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    BBA Reviews On Bioenergetics 1098 (1991), S. 117-126 
    ISSN: 0304-4173
    Keywords: (Chr. minutissimum) ; Electron transport ; Kinetics ; Photosynthesis ; Reaction center
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  • 80
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    Scientia Horticulturae 57 (1994), S. 353-358 
    ISSN: 0304-4238
    Keywords: Acclimatization ; CO"2 enrichment ; Homalomena ; Light ; Micropropagation ; Photosynthesis ; Transpiration
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 81
    ISSN: 0304-4173
    Keywords: (Synechococcus) ; Charge separation ; Photosynthesis ; Salt effect ; Water oxidation
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    BBA Reviews On Bioenergetics 1099 (1992), S. 226-232 
    ISSN: 0304-4173
    Keywords: (Nostoc) ; ATPase ; Cyanobacterium ; Enzyme activation ; Photosynthesis ; Thioredoxin
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    BBA Reviews On Bioenergetics 1099 (1992), S. 35-44 
    ISSN: 0304-4173
    Keywords: (Spinach) ; Cytochrome f ; Electron transfer ; Photosynthesis ; Photosystem I ; Plastocyanin ; Turnip
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    ISSN: 0304-4173
    Keywords: (Hibiscus sp.) ; Chloroplast ; Cyclic electron flow ; Linear electron flow ; Modulated fluorimetry ; Photosynthesis ; Photosystem
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    Plant Science Letters 32 (1983), S. 279-285 
    ISSN: 0304-4211
    Keywords: Carbon isotope ratio ; Crassulacean acid metabolism ; Cycling ; Photosynthesis ; Welwitschia
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    Scientia Horticulturae 57 (1994), S. 293-301 
    ISSN: 0304-4238
    Keywords: Blackcurrant ; Chilling ; Leaf growth ; Photoinhibition ; Photosynthesis ; Ribes nigrum L. ; Stomatal conductance
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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    Scientia Horticulturae 60 (1994), S. 89-99 
    ISSN: 0304-4238
    Keywords: Asian pear ; Fruit growth ; Photosynthesis ; Pyrus serotina ; Regulated deficit irrigation ; Water relations ; Water stress
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    Plant Science 94 (1993), S. 19-33 
    ISSN: 0168-9452
    Keywords: Electron transport ; Heat stress ; Photosynthesis ; Photosystems I and II ; Solanum tuberosum
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    Plant Science 95 (1994), S. 141-152 
    ISSN: 0168-9452
    Keywords: Carotenoids ; Chlorophyll fluorescence ; Leaf senescence ; Panicum miliaceum ; Photosynthesis ; Water stress
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    ISSN: 0168-9452
    Keywords: Maize ; Open photoacoustic cell ; Oxygen evolution ; Photoacoustic Spectroscopy ; Photosynthesis ; Zea mays L
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    Plant Science 97 (1994), S. 177-187 
    ISSN: 0168-9452
    Keywords: Barley ; Chloroplast ; Electron transport ; Genetic variation ; Photosynthesis ; Plastocyanin
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    Plant Science 32 (1983), S. 279-285 
    ISSN: 0168-9452
    Keywords: Carbon isotope ratio ; Crassulacean acid metabolism ; Cycling ; Photosynthesis ; Welwitschia
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    Plant Science 100 (1994), S. 147-156 
    ISSN: 0168-9452
    Keywords: Compatible solutes ; Heliotropium kotschyi ; Photosynthesis ; Prosopis cineraria ; Transpirational cooling ; Zygophyllum qatarense
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    Plant Science 98 (1994), S. 117-126 
    ISSN: 0168-9452
    Keywords: CO"2 compensation ; Peach ; Photorespiration ; Photosynthesis ; Respiration ; Taphrina
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    Plant Science 92 (1993), S. 121-127 
    ISSN: 0168-9452
    Keywords: Differential scanning calorimetry ; Electron transport ; Euglena gracilis ; Photosynthesis ; Temperature ; Thylakoid structure and function
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  • 96
    ISSN: 0014-5793
    Keywords: Alexandrium cohorticula ; Carotenoid ; Dinoflagellate ; Peridinin ; Photosynthesis ; Pigment-protein complex
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    FEBS Letters 226 (1988), S. 352-356 
    ISSN: 0014-5793
    Keywords: (Barley protoplast) ; Oxidative phosphorylation ; Photophosphorylation ; Photosynthesis ; Plant respiration
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    FEBS Letters 228 (1988), S. 259-262 
    ISSN: 0014-5793
    Keywords: (Chlamydomonas reinhardtii) ; Antimycin A ; Chlororespiration ; Kok effect ; Photosynthesis ; Photosystem I
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    ISSN: 0014-5793
    Keywords: D1 polypeptide ; Photoinhibition ; Photosynthesis ; Photosystem II ; Spinacia oleracea
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  • 100
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    FEBS Letters 299 (1992), S. 127-130 
    ISSN: 0014-5793
    Keywords: Chlorobium limicola ; Electron transport ; Photosynthesis ; Quinone reductions ; Sulfide oxidation
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