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  • 11
    Electronic Resource
    Electronic Resource
    Embryonic growth impaired by maternal hypoglycemia during early organogenesis in normal and diabetic rats (1994)
    Springer
    Acta diabetologica 31 (1994), S. 141-146 
    Details
    ISSN: 1432-5233
    Keywords: Hypoglycemia ; Maternal diabetes ; Rat embryo ; Early organogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of maternal hypoglycemia on early organogenesis was studied in normal and diabetic rats. Female Wistar rats were made diabetic by an intravenous injection of streptozotocin (45 mg/kg) 2–3 weeks before conception. On day 9.5 or 10.5 of embryo development, both control and diabetic dams received saline or Actrapid human insulin (400 mU/rat) intraperitoneally after 19-h starvation. The fasting plasma glucose levels in diabetic dams decreased from approximately 23 to 8 mM. Hypoglycemia as low as 3.5 mM was maintained for 60 min in insulin-treated mother rats. Pregnancy was terminated on day 11.6 of embryo development. A significant growth retardation was found in diabetic embryos as compared with normal embryos. Maternal hypoglycemia lowered the DNA content in normal but not diabetic embryos, while the teratogenic effect of maternal hypoglycemia was not pronounced in either normal or diabetic embryos. These data may suggest that maternal hypoglycemia in vivo in early pregnancy influences the embryogenesis but not teratogenesis of rat embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570368
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Rheological properties of silica suspensions in the presence of polymer (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 180-182 
    Details
    ISSN: 1435-1536
    Keywords: Rheology ; suspension ; adsorption ; polystyrene ; depletion flocculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Storage moduli (G′) of hydrophilic and hydrophobic silica suspensions in trans-decalin and in trans-decalin solutions of polystyrene (PS) have been measured by taking account of PS adsorption. PS were adsorbed on the hydrophilic silica. TheG′ values of the hydrophilic suspensions in the presence of low molecular weight PS are similar to those without PS and they are larger than those in the presence of higher molecular weight PS. On the other hand, any PS chains cannot adsorb on the hydrophobic silica particles. TheG′ values of all hydrophobic suspensions are higher than that in trans-decalin due to depletion flocculation and they are two orders of magnitude larger than those for the hydrophilic silica suspensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189516
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    BaTiO3-based positive temperature coefficient of resistivity ceramics with low resistivities prepared by the oxalate method (1995)
    Springer
    Journal of materials science 30 (1995), S. 3395-3400 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Positive temperature coefficient of resistivity (PTCR) ceramics with low resistivities at room temperature were obtained by using oxalate-derived barium titanate powders. The average room-temperature resistivity of the PTCR ceramics was 4Ω cm, and the magnitude of their PTCR jump was around four orders with a voltage proof of more than 50 Vmm−1. These PTCR properties are significantly influenced by the calcination temperature of the starting materials and by the resultant properties of the ceramic bodies. The microstructure of such-PTCR ceramics with a low room-temperature resistivity produced in this study was found to be rather heterogeneous. Complex impedance measurements revealed that the resistivity of the present PTCR materials was determined predominantly by the grain-boundary resistance even at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349885
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    Paper (German National Licenses)
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