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  • 1975-1979  (3)
  • 1955-1959  (1)
  • 1920-1924
  • Polymer and Materials Science  (3)
  • Contractile responses  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Contractile responses to direct stimulation of frog slow muscle fibres before and after denervation (1979)
    Springer
    Pflügers Archiv 382 (1979), S. 43-50 
    Details
    ISSN: 1432-2013
    Keywords: Slow fibres ; Contractile responses ; Effect of denervation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 1. The contractile responses of single slow muscle fibres were investigated under isometric conditions. The fibres were isolated from normal and denervated iliofibularis muscles ofRana temporaria. Direct stimulation was achieved by external application of electrical pulses or depolarizing solutions (40 mM K and acetylcholine 10\t-6 g/ml). 2. Upon electrical stimulation normal slow fibres developed contractions whose amplitude increased steadily with the strength of the pulses. These contractions did not exceed 0.22 kg/cm2, and their rates of rise and fall were approximately 1/6 of those observed in twitch fibres. During pulses of several 100 ms duration the tension continued to rise slowly until the end of the pulses. Application of 40 mM K or acetylcholine resulted in contractures which reached maximum values of 1.71 and 1.87 kg/cm2, respectively, after less than 1 min; little relaxation occurred during the following minutes. 3. The responses of slow fibres denervated for 9−76 days differed in several respects from those of normal slow fibres. a) The contractions elicited by electrical stimulation became faster but their amplitude decreased; the relationship between tension and pulse strength remained, however, essentially unchanged. b) Small and short contractions could be observed during and at the end of stimulating current pulses. Their amplitude was independent of the amplitude and duration of the stimuli; they were blocked by tetrodotoxin and must be attributed to action potentials. c) The ability to develop and maintain tension was reduced. Maximum values of K- and acetylcholine contractures were generally only 50% of those observed in normal slow fibres. Maintenance of tension was markedly reduced in some fibres, less so in others. 4. It is concluded that incorporation of Na channels into its membrane does not transform the slow fibre into a type of fibre which resembles a twitch fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585902
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen zur radikalischen Copolymerisation von Acrylnitril mit α-Olefinen. 5. Mitt. Bestimmung der r-Werte am System Acrylnitril/Allylbenzol4. Mitt.: siche [8]Teil der Dissertation von H. S. Trang, Technische Universität Dresden, Sektion Chemie, 1978Herrn Professor Dr. Vasilij Vladimirovič Koršak zur Vollendung des 70. Lebensjahres gewidmet. (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 98-102 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The r-values of the monomer pair acrylonitrile/allylbenzene in the radical bulk and solution polymerization, using hexamethylphosphoric acid triamide, dimethylsulfoxide, γ-butyrolactone, ethylene carbonate and nitromethane as solvents, have been determind. A copolymerization equation is derived, considering the degradative chain transfer, associate formation and solvent effect, by which the deviations from the Mayo-Lewis concept and the solvent effects can be explained.
    Notes: Die r-Werte des Monomerpaares Acrylnitril/Allylbenzol wurden bei der radikalischen Copolymerisation in Substanz bzw. in den Lösungsmitteln Hexamethylphosphorsäuretriamid, Dimethylsulfoxid, γ-Butyrolacton, Ethylencarbonat und Nitromethan bestimmt. Unter Berücksichtigung der degradativen Kettenübertragung, der Assoziatbildung und des Lösungsmitteleinflusses wurde eine Copolymerisationsgleichung abgeleitet, mit deren Hilfe die Abweichung vom Mayo-Lewis-Modell und Lösungsmitteleffekte interpretierbar sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300206
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  • 3
    Electronic Resource
    Electronic Resource
    Fraktionierung von polyestern an harnstoffsäulen (1955)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 16 (1955), S. 74-76 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1955.020160110
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen zur radikalischen Copolymerisation von Acrylnitril mit α-Olefinen. 6. Mitt. Zur Assoziatbildung von Allybenzolsiehe 5. Mitt. [1] (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 409-411 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In order to investigate the deviation of the copolymerization of acrylonitrile with allyl benzene from the Mayo-Lewis model caused by association the temperature-dependence of the r-values in different solvents and at different monomer ratios was determined. Independent comparison is achieved by 1H and 13C-NMR spectra of allyl benzene in tetrachloromethane and nitromethane.
    Notes: Zur Untersuchung der Abweichung vom MAYO-LEWIS-Modell bei der Acrylnitril-Allylbenzol-Copolymerisation durch Assoziatbildung wurde die Temperaturabhängigkeit der r-Werte in verschiedenen Lösungsmitteln und bei unterschiedlichen Monomermischungsverhältnissen bestimmt. Zum unabhängigen Vergleich dienten 1H- und 13C-NMR-Spektren des Allylbenzols in Tetrachlormethan und Nitromethan.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300706
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    Paper (German National Licenses)
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