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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 Using 470 original and unpublished images, the book shows various ultrastructural morphological phenotypes; defects of the sperm head, neck, middle piece, principal piece, and terminal piece; as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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  • 2
    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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  • 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
    Studies of the Formation of Carbon Clusters (1999)
    Springer
    Journal of cluster science 10 (1999), S. 383-396 
    Details
    ISSN: 1572-8862
    Keywords: Fullerene ; formation mechanism ; carbon cluster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Experimental and theoretical studies focusing on the formation of carbon clusters are described. In the experiment on discharge in liquid chloroform, a series of perchlorinated fragments of C60 was synthesized and a scarce amount of C60 was detected. In the laser vaporization experiments, it was found that the production of C 60 + and other fullerene ions could be promoted by doping chlorine-containing compounds into carbon targets. Chlorine atoms were found to play key roles of not only tying up the dangling bonds of the polycyclic carbon clusters, but also catalyzing the formation of fullerenes. The results showed that C60 and other fullerenes are formed from growth of small carbon species and supported the “Pentagon Road” scheme of the fullerene formation mechanism. On the other hand, ab initio calculations were carried out on formation reactions of C60 from its various perchlorinated fragments, C60−2mCl10. The monotonically decreasing calculated energies of reactions with growing size of the fragments confirm that the formation reaction is energetically favorable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022625009704
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  • 5
    Electronic Resource
    Electronic Resource
    In Situ Synthesis of Hybrid-Reinforced Titanium Matrix Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 127 (Sept. 2007), p. 155-160 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Novel hybrid TiB, TiC and rare earth oxide (Re2O3) reinforced titanium matrix composites werein situ synthesized utilizing the reaction between Ti, B4C (or C), rare earth (Re) and B2O3 throughhomogeneously melting in a non-consumable vacuum arc remelting furnace. In this work, Nd and Ywere chosen as rare earth (Re) added in the in situ reaction. The thermodynamics of in situ synthesisreaction was studied. The results of X-ray diffraction (XRD) proved that no other phases appearedexcept for TiB, TiC and Re2O3. The microstructures of the composites were examined by scanningelectron microscope (SEM) and backscattered scanning electron microscope (SEM). The resultsshowed that there were mainly three kinds of reinforcements: TiB whiskers, TiC particles andRe2O3 particles. The reinforcements were fine and were homogeneously distributed in the matrix.The interfaces of TiB-TiC and Nd2O3-Ti were examined by high-resolution transmission electronmicroscopy (HREM).Transmission electron microscopy (TEM) and selected area diffraction (SAD)were used to analyze the orientation relationships of TiB-TiC and Nd2O3-Ti. The orientationrelationship between TiB and TiC can be described as: [001] TiB //[001] TiC , (010) TiB //(110) TiC . Theorientation relationship of Nd2O3 and α-Ti can be described as: [110] Nd2O3 //[ 1213 ] Ti ,(111) Nd2O3 //(1101) Ti , ( 001) Nd2O3 //( 2110 ) Ti
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.127.155.pdf
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  • 6
    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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  • 7
    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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  • 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
    Recrystallization in AZ31 Magnesium Alloy during Hot Deformation (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 559-562 
    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: In this study, isothermal torsion tests were carried out on magnesium AZ31B alloy under constant strain rate conditions, in the range of 250 to 400oC at 0.01, 0.1, and 1.0 s-1. Alloy flow stress dependence on strain rate and temperature can be described by a power law with activation energy of 130 kJ/mol. Microstructural examination of hot deformed samples shows very fine recrystallized grains decorating grain boundaries of larger gains in the form of a necklace. These fine grains are produced by dynamic recrystallization at the grain boundaries of original grains. Microstructure evolution, based on samples quenched at different strain levels, indicates that increasing deformation strain has little effect on recrystallized grain size but widens the recrystallized region, with full recrystallization achieved at a certain high strain level. Recrystallized grain size increases with increasing deformation temperature and strain rate. The latter suggests recrystallization in AZ31 to be essentially a time dependant phenomenon
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.559.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A Surface/Interfacial Structural Model of Pd Ultra-thin Film on SiC at Elevated Temperatures (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 338-342 (May 2000), p. 415-418 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.338-342.415.pdf
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