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  • 1
    Online Resource
    Online Resource
    Atlas of Human Sperm Ultrastructural Morphology (2020)
    Singapore :Springer Nature Singapore :
    Details
    Keywords: Human physiology. ; Urology. ; Biophysics. ; Human Physiology. ; Urology. ; Bioanalysis and Bioimaging.
    Description / Table of Contents: Introduction of human sperm ultrastructural morphology -- Ultrastructural morphology of human sperm head -- Ultrastructural morphology of human sperm neck -- Ultrastructural morphology of human sperm middle piece -- Ultrastructural morphology of human sperm principal piece -- Ultrastructural morphology of human sperm terminal piece -- Ultrastructural morphological measurement of human sperm -- Artefacts of human sperm ultrastructural morphology -- Phenomena related to inadequate preparation of human sperm.
    Abstract: This atlas provides ultrastructural morphological images of human spermatozoa. Sperm morphology plays an essential role in sperm-oocyte interactions and early embryonic development, and human sperm ultrastructural morphology offers a valuable reference tool for assessing certain etiologies of male infertility and reproductive failure. However, the ultrastructural morphology of human sperm has not been systematically evaluated or thoroughly described in the literature. Using 470 original and unpublished images, the book shows various ultrastructural morphological phenotypes; defects of the sperm head, neck, middle piece, principal piece, and terminal piece; as well as artifacts of sperm ultrastructural morphology and phenomena related to inadequate preparation, demonstrating several sperm phenotypes and surface structural appearances for the first time. As such, it helps researchers and practitioners in andrology, reproductive medicine, and reproductive pathology gain a better understanding of human sperm ultrastructural morphology.
    Type of Medium: Online Resource
    Pages: XIII, 276 p. 370 illus., 2 illus. in color. , online resource.
    Edition: 1st ed. 2020.
    ISBN: 9789811553257
    URL: https://doi.org/10.1007/978-981-15-5325-7
    DOI: 10.1007/978-981-15-5325-7
    DDC: 612
    Language: English
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    E-BOOKS (AWI ONLY)
  • 2
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    Unknown
    Spatially heterogeneous shifts in vegetation phenology induced by climate change threaten the integrity of the avian migration network (2024)
    Wiley
    In:  Global Change Biology vol. 30 no. e17148
    Details
    Publication Date: 2024-04-22
    Description: Phenological responses to climate change frequently vary among trophic levels, which can result in increasing asynchrony between the peak energy requirements of consumers and the availability of resources. Migratory birds use multiple habitats with seasonal food resources along migration flyways. Spatially heterogeneous climate change could cause the phenology of food availability along the migration flyway to become desynchronized. Such heterogeneous shifts in food phenology could pose a challenge to migratory birds by reducing their opportunity for food availability along the migration path and consequently influencing their survival and reproduction. We develop a novel graph-based approach to quantify this problem and deploy it to evaluate the condition of the heterogeneous shifts in vegetation phenology for 16 migratory herbivorous waterfowl species in Asia. We show that climate change-induced heterogeneous shifts in vegetation phenology could cause a 12% loss of migration network integrity on average across all study species. Species that winter at relatively lower latitudes are subjected to a higher loss of integrity in their migration network. These findings highlight the susceptibility of migratory species to climate change. Our proposed methodological framework could be applied to migratory species in general to yield an accurate assessment of the exposure under climate change and help to identify actions for biodiversity conservation in the face of climate-related risks.
    Keywords: bird migration ; climate change ; graph-based approach ; heterogeneous shifts ; network integrity ; phenological asynchrony ; vegetation phenology
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Exposure to Chlorination By-Products from Hot Water Uses (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 14 (1994), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Exposures to chlorination by-products (CBP) within public water supplies are multiroute in water. Cold water is primarily used for ingestion while a mixture of cold water and hot water is used for showering, bathing others, dish washing, etc. These latter two activities result in inhalation and dermal exposure. Heating water was observed to change the concentration of various CBP. An increase in the trihalomethanes (THM) concentrations and a decrease in the haloacetonitriles and halopropanones concentration, though an initial rise in the concentration of dichloropropanone, were observed. The extent of the increase in the THM is dependent on the chlorine residual present. Therefore, estimates of total exposure to CBP from public water supplies need to consider any changes in their concentration with different water uses. The overall THM exposures calculated using the THM concentration in heated water were 50% higher than those calculated using the THM concentration present in cold water. The estimated lifetime cancer risk associated with exposure to THM in water during the shower is therefore underestimated by 50% if the concentration of THM in cold water is used in the risk assessment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1539-6924.1994.tb00032.x
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  • 4
    Electronic Resource
    Electronic Resource
    The natural killer T-cell ligand α-galactosylceramide prevents autoimmune diabetes in non-obese diabetic mice (2001)
    [s.l.] : Nature Publishing Group
    Nature medicine 7 (2001), S. 1052-1056 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Diabetes in non-obese diabetic (NOD) mice is mediated by pathogenic T-helper type 1 (Th1) cells that arise because of a deficiency in regulatory or suppressor T cells. Vα14–Jα15 natural killer T (NKT) cells recognize lipid antigens presented by the major histocompatibility complex ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm0901-1052
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure and Tensile Properties of In Situ Synthesized (TiB+TiC)/Ti-6Al-4V Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 351 (Oct. 2007), p. 201-207 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, Ti-6Al-4V matrix composites reinforced with 5% or 10% TiB and TiC werein situ synthesized by common casting and hot-forging technology utilizing the reaction betweentitanium and B4C. The phase constituents were identified by XRD while transus temperatures weredetermined by DSC and metallography. The evolution of microstructures was studied by opticalmicroscopy. The effects of reinforcements on the microstructures, tensile properties and fractures atroom temperature were discussed. The results show that yield strength and ultimate tensile strengthincreased significantly while ductility decreased with reinforcements increasing. Fracture typeturned to brittle when reinforcements increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.351.201.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of Cosurfactant on the Structure and Properties of ZrO〈sub〉2〈/sub〉 Nano-Powders Prepared in Microemulsion System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 729-731 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: ZrO2 nano-powders were prepared by a microemulsion process with the water-in-oil system ofwater/cyclohexane/Triton X-100/hexyl alcohol. The influence of cosurfactant content and the heterogeneousdistillation process on the structure and properties of the particles was studied. XRD analysisshowed that the cosurfactant content has little influence on the crystal phase of ZrO2. With the increasingmass ratio of cosurfactant to surfactant from 0.3 to 0.5 and 0.7, the average size of ZrO2 powders increasesfrom 23.3 to 25.2 and 27.5 nm. The heterogeneous distillation process can effectively inhibit the formationof hard agglomeration during evaporation and increase the specific surface areas of ZrO2 powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.729.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Design and Analysis of Equilibrium Machine for Brake Dish Based on Virtual Kind Machine Technique (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 826-831 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The balance of brake dish is very important for a car driving. Taking one kind ofauto-equilibrium-machine of brake dish as research object, and making use of theVirtual–kind-machine technique and the ADAMS software as analysis tools, as well as with theSolid Works to set up a model, for a whole, the kinematics and dynamics of the product areanalyzed in various virtual environment, the research of dynamics simulation of machine system iscarried out, and various design projects are analyzed Quickly, the experiment is done, which is quitedifficult to be realized by physical kind machine, after all these, an optimal design project of thesystem is decided. The virtual kind machine technique is applied through whole design process,thus the design of the product development becomes convenient, the development period isshortened, and the product costs are reduced so that optimal-new product can be acquired
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.826.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of SiO〈sub〉2〈/sub〉 Nanoparticles by Microemulsion Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 787-789 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The stable region of microemulsion of Triton X-100/hexanol/cyclohexane/ water water-in-oil(W/O) system was investigated by using distilled water as aqueous phase. SiO2 nanopowders wereprepared by hydrolysis of tetraethoxysilane (TEOS) in the designed reverse microemulsion. The preparedsamples were characterized by XRD and TEM. The results showed that the size of particles is within arange of 40~50nm and the aggregation is not evident after heat treatment. The size of particle is minimaland the dispersal is optimal when the ammonia content is 11% in volume
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.787.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Biocompatibility and Osteogenesis of Calcium Phosphate Cement Scaffolds for Bone Tissue Engineering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1383-1386 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous calcium phosphate cement (CPC) scaffolds were successfully fabricated utilizingparticle-leaching method. Mesenchymal stem cells (MSCs) were cultured, expanded and seeded onthe scaffolds and the proliferation and differentiation of MSCs into osteoblastic phenotype weredetermined using MTT assay, ALP activity and ESEM. The results revealed that the CPC scaffoldswere biocompatible and had no negative effects on the MSCs in vitro. The in vivo biocompatibilityand osteogenicity of the scaffolds were investigated. Both pure scaffolds and MSCs/scaffoldconstructs were implanted in rabbit mandibles and studied histologically. The results showed thatCPC scaffolds exhibited good biocompatibility and osteoconductivity. Moreover, the introduction ofMSCs into the scaffolds dramatically enhanced the efficiency of new bone formation initially
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1383.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Occurrence of Polytype Transformation during Nitrogen Doping of SiC Bulk Wafer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 39-42 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The polytype structural variations of a set of SiC bulk wafers with different Nitrogen (N) doping levels, prepared by Physical Vapore Deposition (PVD), are studied. The initial growth conditions were used to produce 6H-polytype SiC, which has been approved for the undoped and lightly doped materials. However, when extreme high N-dopants were applied, the obtained wafer was found with 4H- and 15R-polytype features. Our experimental results of HR-TEM and Raman scattering have revealed clearly the polytype transformation, indicating that the inducement of N in the reactor leads to the polytype transformation of the resulted SiC crystal
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.39.pdf
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