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  • Polymer and Materials Science  (2)
  • embryo freezing  (1)
  • ethanol  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of cryopreservation on the development of S- and G2-phase mouse embryos (1991)
    Springer
    Journal of assisted reproduction and genetics 8 (1991), S. 89-95 
    Details
    ISSN: 1573-7330
    Keywords: embryo freezing ; third-cell cycle ; DNA synthesis ; mouse embryos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The survival rate and development of four-cell-stage mouse embryos frozen and thawed in S phase versus G2 phase was compared. Significantly more G2-phase than S-phase embryos survived freezing and thawing. In both groups, disruption of the zona pellucida, fusion of blastomeres, and dispersion of chromosomes were occasionally observed after thawing. Cryopreservation resulted in a longer delay in cleavage from the four-to the eight-cell stage of S (about 5 hr)- and G2-phase embryos (about 3 hr) compared to unfrozen controls. The number of frozen embryos which developed to the blastocyst stage was reduced compared to controls, and in the case of S-phase embryos, formation of the blastocyst cavity was also delayied. However, the average number of cells in the experimental and control embryos was similar. No increased incidence of chromosome abnormalities was seen. Our results suggest that freezing embryos in G2 is superior to freezing in S phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01138661
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ethanol-induced crack healing in poly(methyl methacrylate)This work was supported by the National Science Council, Taiwan, Republic of China through grant number NSC83-0417-E-007-006 (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1217-1227 
    Details
    ISSN: 0887-6266
    Keywords: PMMA ; ethanol ; crack healing ; Case I ; Case II ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crack healing induced by ethanol in poly(methyl methacrylate) (PMMA) has been studied at temperatures of 40-60°C. Crack healing occurs because the effective glass transition temperature of PMMA is reduced to below the test temperature by ethanol plasticization. It is found that crack closure rate is constant at a given temperature. The fracture strength of healed PMMA is lower than that of the original samples. By comparing the fracture stress with the morphology of the crack edge on the PMMA surface, we found that a high degree of swelling is responsible for the incomplete recovery of mechanical strength. The fractography of the completely healed sample shows a very different fracture morphology from that of virgin PMMA. The transport of ethanol in PMMA also is studied. At lower temperatures, transport is described by ideal Case II behavior. As the temperature increases, the kinetics shift from ideal Case II to anomalous behavior. The first stage of crack healing is controlled by Case I transport. © 1994 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320709
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Continuous vapor phase polymerization of pyrrole. I. Electrically conductive composite fiber of polypyrrole with poly(p-phenylene terephthalamide) (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 2155-2159 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Electrically conductive polypyrrole (PPy)/poly(p-phenylene terephthalamide) (PPTA) composite fibers have been prepared by continuous vapor phase polymerization at a speed of 0.5 ∼ 1.5 m/min. The main parameters have been examined, and the conducting fibers with the best properties of electrical conductivity 0.68 s/cm, tensile strength 2731 N/mm2, and the elongation at break 4.8% were obtained by using FeCl3 · 6H2O as the oxidizing agent. The results of elemental analysis, wide-angle X-ray diffraction analysis and SEM of the composite fibers are also reported. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070581202
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    Paper (German National Licenses)
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