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Effect of nerve length and temperature on the induction of action potentials in denervated slow muscle fibres of the frog (1977)

Schalow, G. ; Schmidt, H.

Springer

Pflügers Archiv 372 (1977), S. 17-22

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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

URL: http://dx.doi.org/10.1007/BF00582201

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On the linear viscoelastic limit of polymers - exemplified on poly(methyl methacrylate) (1979)

Brüller, O. S. ; Schmidt, H. H.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 19 (1979), S. 883-887

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The linear viscoelastic limit of poly(methyl methacrylate) (PMMA) is established on the basis of the Reiner-Weissenberg criterion of strength. The obtained limit is not simply a “strainlimit” or a “stress-limit” but a function of both strain and stress, an energetical limit. In stress-strain representation the limit is independent of time and temperature, which means that the linear or non-linear behavior of the material depends only on the actual values of strain and stress. Some experimental data obtained on PMMA confirm the theory.

Additional Material: 6 Ill.