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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 166 (1959), S. 144-151 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es ließ sich zeigen, daß zur Beschreibung des Steigens von Flüssigkeiten in Papier der mathematische Formalismus der Diffusion gültig ist. Es wurden Fälle von linearem und radialem Fluß für mehrere Lösungsmittel-Papier-Kombinationen experimentell durchgemessen. Die Abhängigkeit des „Diffusionskoeffizienten“ von der Konzentration wurde bestimmt und in numerischen Rechnungen Fließgeschwindigkeiten und Konzentrationsprofile ermittelt. Die Übereinstimmung von Theorie und Experiment erwies sich in allen Fällen als befriedigend und zeigt damit, daß die Diffusionsanalogie sinnvoll ist.
    Notes: Abstract The mathematics of diffusion have been found valid in the description of the flow of liquids in paper. Cases of linear and radial flow have been observed experimentally for several solvent-paper systems. The dependence of the diffusion coefficient on concentration for various systems has been determined and these relations have been used in the numerical calculation of the flow rate and concentration profiles. The agreement of theory and experiment is, in all cases, satisfactory, indicating the validity of the diffusion analogy.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7330
    Keywords: suppression ; embryos ; implantation ; in vitro fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The high rate of implantation failure in humans following in vitro fertilization (IVF) has been attributed to a lack of production of immunosuppressive factors by cleaved embryos, rendering them vulnerable to maternal immune attack just before or around implantation. Systemic as well as blastocyst-secreted suppressor factors have been described and claimed to be responsible for successful pregnancy. Experimentally, we have screened in a double-blind fashion the suppressive activity of human embryo culture media (B2 Menezo system, France) in which zygotes after decoronization were individually cultured during 24 hr on lymphocyte proliferation as well as natural killer (NK) activity. Suppressive activity in media from cleaved and uncleaved ova did not differ significantly, and activity in media from transferred embryos was not correlated significantly with successful pregnancy. The implications of these data are discussed.
    Type of Medium: Electronic Resource
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