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  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 53-54 (1983), S. 187-195 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary 17β-Estradiol (E2) rapidly and reversibly decreases the synthesis of follicle-stimulating hormone (FSH) in primary dispersed cell cultures of ovine pituitaries. Similarly, E2 also causes a decrease in the messenger RNA for the beta subunit of ovine FSH (FSIIβ-mRNA) as measured in an in vitro translation assay. These results are consistent with the concept that E2 directly regulates either transcription of the FSHβ gene or processing of FSHβ-mRNA in sheep. Of additional interest is the observation that pituitary cultures from various species respond differently to E2 in terms of FSH synthesis. For example, E2 stimulates FSH synthesis in rat pituitary cultures, has no effect in similar rabbit cultures, and inhibits FSH synthesis in ovine cultures. Thus, a set of eukaryotic ‘mutants’ may exist to aid studies of the effect of E2 on FSH synthesis and secretion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 17 (1982), S. 1311-1319 
    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 For the first time the intrinsic tensile stress-strain behaviour of polystyrene was measured in an inert atmosphere (He) from 77 to 350 K. The intrinsic tensile strength decreases monotonically with increasing temperature with completely brittle behaviour below 231 K and crazing without shear flow at higher temperatures. The behaviour in N2, Ar, CH4, CO2, H2S, and N2O was observed with the relative pressure being the important parameter. The softening depended on the square root of the relative pressure. A calculation was made of the concentration of absorbed gas to produce a given amount of softening. The question of why polystyrene is a brittle solid and thus crazes instead of shear flows is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0271-2091
    Keywords: Potential Flows ; Navier-Stokes Problems ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An approach for the numerical solution of flow problems based on the concept of fundamental solutions of differential equations is described. This approach uses the finite element methodology but does not rely on the concept of variational principle or that of residuals. The approach is shown to be well-suited for many types of flow problems. Various applications of this approach are discussed in this paper, with particular emphasis placed on the solution of potential flows and viscous flows containing appreciable regions of separation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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