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  • 1
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 2553-2571 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: An experimental study was carried out to investigate the influence of molecular weight distribution on stretchability and thread nonuniformity of high-density polyethylene monofilaments. For the study, a melt-spinning/multistage stretching device was constructed, and the monofilaments were extruded first into a quench tank and subsequently stretched twice in an annealing bath. Processing variables investigated were (a) the extrusion temperature, (b) the shear rate in the spinnerette hole, (c) the air-gap distance, (d) the annealing bath temperature, (e) the take-up speed at the first-stage stretching, and (f) the take-up speed at the second-stage stretching. Fiber samples were collected at each stage of stretching, namely, (a) as melt-spun, (b) after the first-stage stretching, and (c) after the second-stage stretching. The maximum stretch rate at which thread breakage occurs was determined at the first-and second-stage stretching in the annealing bath. The melt-spun materials were three different grades of Mitsui Petrochemicals high-density polyethylene and two different grades of Union Carbide high-density polyethylene. Also melt spun were blends of two Mitsui polyethylenes and the two Union Carbide polyethylenes. An attempt was made (a) to correlate stretchability with the molecular weight distribution of the high-density polyethylene; (b) to identify the influence of spinning conditions on stretchability for a given polymer; (c) to correlate the variations of the fiber diameter with the molecular weight distribution and spinning conditions, and (d) to correlate the stretchability of a blend system with blending ratio. tensile properties (the tensile strength at the yield point, tensile elastic modulus, and percent elongation at break) were determined for all fiber samples collected, using the Instron tensile tester. For some fiber samples of special interest, selected on the basis of the spinning experiment results, wide-angle x-ray diffraction measurements were taken to determine the molecular orientation in a filament.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 1654-1663 
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Auf Grund von neuen Beobachtungen und synthetischen Experimenten wurden für α- und β-Sorigenin aus Rhamnus japonica die modifizierten Strukturformeln I11 und XIIT aufgestellt.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 28 (1995), S. 291-309 
    ISSN: 0739-4462
    Schlagwort(e): juvenile hormone ; methoprene ; pyriproxyfen ; fat body ; locust ; binding protein ; receptor ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Juvenile hormone (JH) binding components from the fat body of the African migratory locust were analyzed in a search for a potential nuclear JH receptor. Biosynthetically prepared 10R[3H]JH III gave a high proportion of specific binding to isolated nuclei and extracted proteins; data obtained with the JH analogs, [3H]methoprene and [3H]pyriproxyfen, on the other hand, were obscured by abundant non-specific binding. The vast majority of the high affinity JH III binding activity present in cytosolic and nuclear extracts was due to a high molecular weight JH binding protein (JHBP) which has previously been identified in locust hemolymph. This protein has several chromatographic forms which interfered in the search for a nuclear JH receptor. When specific antiserum was used to remove JHBP from nuclear extracts, a novel JH binding activity (NBP) was detected. NBP could be separated from JHBP by precipitation with ammonium sulfate. NBP displayed a high affinity for JH III (Kd = 0.25 nM) and JH I and JH II competed strongly for JH III binding, whereas methoprene and pyriproxyfen showed apparent competition when present in 1,000-fold excess. NBP was present in nuclear extracts at approximately 25,000 sites per cell; levels were similar in male and female locusts and were not greatly affected by the presence or absence of JH. The characteristics of NPB make it a strong candidate for a nuclear JH receptor. © 1995 Wiley-Liss, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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