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  • Articles: DFG German National Licenses  (3)
  • first normal-stress difference  (2)
  • Free testosterone  (1)
  • 1
    ISSN: 1434-0879
    Keywords: TeBG ; Free testosterone ; Acid phosphatase ; Prostatic carcinoma ; Castration and DES-D therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The levels of plasma testosterone, testosterone-oestradiol binding globulin (TeBG) and total serum acid phosphatase (TSAP) following antiandrogenic hormone therapy were investigated in 17 patients with prostatic carcinoma. The low levels of plasma total and free testosterone induced by castration decreased further after diethylsitlboestrol diphosphate (DES-D) administration. Plasma TeBG binding capacity after castration was 118.9% of the pre-treatment level and increased to 193.9%, 204.0% and 212.7% at 1, 2 and 3 weeks after DES-D dosing. The in vitro binding of 3H-testosterone to TeBG was not influenced in the presence of DES-D or stilboestrol. Clinical response following the DES-D therapy was associated with a decrease in the levels of TSAP. A significantly inversed correlation was found between the decrease in TSAP and increase in TeBG at completion of DES-D therapy. These results suggest that the high binding capacity of TeBG lowers the biologically active fraction of testosterone and thus may produce clinical effects.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 23 (1984), S. 20-30 
    ISSN: 1435-1528
    Keywords: Viscosity ; first normal-stress difference ; fiber filled polymer melt ; glass fiber ; vinylon fiber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Shear viscosity, shear stress and first normal-stress difference have been investigated for glass- and vinylon-fiber filled polyethylene melts over a wide range of shear rate by means of three kinds of instruments. The influence of fiber content and fiber properties on the rheological properties is discussed. The viscosity increases with increasing aspect ratio and fiber content, and the influence of these parameters on the flow properties is evident at low shear rates. The first normalstress difference increases more rapidly with increasing glass fiber content, especially at low shear stresses. The influence of vinylon fibers on the first normal stress-difference vs. shear-stress relationship is different from that of glass fibers.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 20 (1981), S. 390-402 
    ISSN: 1435-1528
    Keywords: Fiber suspension ; first normal-stress difference ; yield stress ; Casson plot ; cone-plate rheometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Das Fließverhalten von Vinylonfasern in Siliconöl wird unter stationären Scherbedingungen in einem Kegel-Platte-Rheometer untersucht. Drei Arten von Vinylonfasern einheitlicher Länge, die eine größere Flexibilität als Glasfasern besitzen, werden verwendet, wobei der Fasergehalt zwischen null und 7 Gew.-% variiert. Scherviskosität, erste Normalspannungsdifferenz, Fließspannung und relative Viskosität werden diskutiert. Scher- und relative Viskosität wachsen mit der Konzentration und dem Längen-zu-Durchmesser-Verhältnis und hängen von der Schergeschwindigkeit ab. Die Anwendbarkeit der Ziegelschen Gleichung für die Viskosität von Fasersuspensionen wird geprüft. Die erste Normalspannungsdifferenz wächst mit der Faserkonzentration, dem Längen-zu-Durchmesser-Verhältnis und der Schergeschwindigkeit, und ihr relativer Anstieg ist viel größer als bei Schubspannung und Viskosität und hängt von der charakteristischen Zeit $$\bar \tau $$ ab. Die Fließspannung kann bei großen Längen-zu-Durchmesser-Verhältnissen mittels des Casson-Diagramms schon bei Konzentrationen bestimmt werden, die viel geringer sind als bei Kugelund Pulversuspensionen. Der Einfluß der Faserflexibilität auf die rheologischen Eigenschaften ist nicht vernachlässigbar.
    Notes: Summary The steady shear flow properties of suspensions of vinylon fibers in silicone oil were measured by means of a cone-plate type rheometer. Three kinds of vinylon fibers used had no distributions of length and were more flexible than glass fibers and the like. The content of the fibers ranged from 0 to 7 wt.%. Shear viscosity, the first normal-stress difference, yield stress, and relative viscosity were discussed. Shear viscosity and relative viscosity increased with the fiber concentration and the aspect ratio, and depended upon the shear rate. The applicability of Ziegel's equation of viscosity for fiber suspensions was investigated. The first normal-stress difference increased with the fiber concentration, aspect ratio, and shear rate and its relative increase was much larger than for shear stress and viscosity depending on the properties of the characteristic time, $$\bar \tau $$ The yield stress could be determined by Casson plots for large aspect ratio fiber suspensions even in low concentration comparing with the suspensions of spherical particles or powder. The influence of the flexibility of the fibers for the rheological properties of the fiber suspensions can not be ignored.
    Type of Medium: Electronic Resource
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