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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 7421-7422 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-6881
    Keywords: Plasma membrane NADH-oxidoreductase ; NADH-oxidase ; NADH∶ferricyanide reductase ; ubiquinone analogues ; ρ0 cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract In the presence of effectors variations in the two recognized activities of the plasma membrane NADH-oxidoreductase system were studied in separate, specificin vitro assays. We report here that ubiquinone analogues that contain a short, less hydrophobic side chain than coenzyme Q-10 dramatically stimulate the NADH-oxidase activity of isolated rat liver plasma membranes whereas they show no effect on the reductase activity of isolated membranes. If measured in assays of the NADH∶ferricyanide reductase of living cultured cells these compounds have only a limited effect; the oxidase activity of whole cells is not measurable in our hands. We have furthermore identified selective inhibitors of both enzyme activities. In particular, the NADH-oxidase activity can be significantly inhibited by structural analogues of ubiquinone, such as capsaicin and resiniferatoxin. The NADH∶ferricyanide reductase, on the other hand, is particularly sensitive to pCMBS, indicating the presence of a sulfhydryl group or groups at its active site. The identification of these specific effectors of the different enzyme activities of the PMOR yields further insights into the function of this system.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2006-2026 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Cross-Conjugated Bond Systems, 42. Higher Vinylogous Pentafulvalenes, Syntheses - ThermolysesThe (Z)-pentafulvatriene 3, the (Z,Z-pentafulvatetraene 5, the (E,Z,E)-pentafulvapentaene derivative 7 as well as the E-isomers 4/6 have been synthesised. In experiments in solution (50 - 150°C) aimed at thermal electrocyclisation no monomeric products could be identified. Upon thermolysis of 3/4 in the gas phase (500°C) a mixture of the vinyldihydroindacenes 44/48 is obtained, the formation of which is discussed in terms of electrocyclisation reactions.
    Notes: Das (Z)-Pentafulvatrien 3, das (Z,Z)-Pentafulvatetraen 5, das (E,Z,E)-Pentafulvapentaen-Derivat 7 sowie die E-Isomeren 4/6 wurden synthetisiert. Bei Versuchen zur thermischen Elektrocyclisierung in Lösung (50 - 150°C) sind keine monomeren Produkte nachweisbar. Bei der Gasphasenthermolyse (500°C) von 3/4 wird ein Gemisch der Vinyldihydroindacene 44/48 erhalten, deren Bildung über Elektrocyclisierungsschritte diskutiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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