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  • 1975-1979  (2)
  • 1920-1924
  • 1910-1914
  • Action potential  (1)
  • Best. von Stickstoff-15 in Organ. Verbindungen  (1)
  • 1
    ISSN: 1432-2013
    Keywords: Slow muscle fibres ; Action potential ; Nerve stump ; Temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A. Pyriformis and extensor longus digiti IV muscles of Rana temporaria were denervated by cutting the sciatic or peroneal nerve at various distances from the muscles. Slow fibres were identified by their membrane time constants, and examined for their ability to produce action potentials in response to intracellularly applied current pulses. B. The slow muscle fibres acquired the ability to generate action potentials several days after denervation. The duration of this latent period depended on the length of the peripheral nerve stump, and on the temperature at which the frogs were kept after the operation. C. At 18°C the latent period increased by 0.36 days per mm of sciatic nerve stump. At 11.5° C the corresponding value was 0.7 days/mm. The effect of length of the peroneal nerve was smaller than that of the sciatic nerve. D. It is suggested that the peripheral nerve stump serves as a reservoir of ‘trophic’ material which is transported towards the slow fibres at a rate of 2.8 mm/day (at 18° C) and seems to block the formation of Na channels. TheQ 10 value of this transport system would be 2.7.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 13-17 
    ISSN: 1618-2650
    Keywords: Best. von Stickstoff-15 in Organ. Verbindungen ; Massenspektrometrie ; Isotopengleichgewicht, Primärvorgänge der Verbrennung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der bei der Verbrennung gebildete Stickstoff aus 15N-markierten Verbindungen mit mehreren N-Atomen, wie Azoverbindungen oder Molekülen mit Stickstoff in verschiedenen Oxidations- und Bindungszuständen, liegt nicht im Isotopengleichgewicht vor. Als Ursache werden die Bildung von Molekülfragmenten durch Pyrolyse und deren Folgereaktionen diskutiert. Die Verbrennung entsprechend markierter Moleküle eignet sich daher zur Untersuchung von Pyrolysevorgängen. Die Resultate zeigen andererseits, daß Isotopenbestimmungen mit einem Doppelfänger-Massenspektrometer in diesen Fällen zu falschen Werten führen können.
    Notes: Abstract Nitrogen formed in the combustion of 15N-labelled compounds containing several nitrogen atoms, such as azo compounds, or molecules with nitrogen in different states of oxidation or binding, is not in isotope equilibrium. The formation of molecule fragments during pyrolysis and their secondary reactions are discussed as a possible reason. Combustion of suitably labelled molecules is therefore a tool for investigations of processes of pyrolysis. On the other hand, the results obtained show that isotope determinations with a double collector mass spectrometer in these cases may cause wrong values.
    Type of Medium: Electronic Resource
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