The initial heat production in garfish olfactory nerve fibres

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
J V HOWARTHD Stagg

Abstract

A study has been made of the temperature changes associated with the passage of a single impulse in the non-myelinated fibres of the garfish olfactory nerve: and the time course of these temperature changes has been compared with the time course of the electrical events during the action potential. As in other non-myelinated nerves studied the observed temperature changes result from a biphasic initial heat production consisting of a transient evolution of heat (the positive heat) followed by a rapid heat reabsorption (referred to as the negative heat). There is no evidence of any additional phases of initial heat production. At 0 degrees C the measured positive initial heat is 224 mucal/g impulse (937 muJ/g impulse); and the corresponding negative initial heat is 230 mucal/g impulse (962 muJ/g impulse). The residual initial heat is very small, being about -6 mucal/g impulse (-25 muJ/g impulse). In the range 0-10 degrees C there is no significant effect of temperature on the magnitude of either the positive or the negative phases of heat production. The experimental thermal records were analysed to determine the true time course of the temperature changes in the nerve undistorted by the recording system. The time course of the ...Continue Reading

References

Feb 1, 1979·Proceedings of the National Academy of Sciences of the United States of America·D LichtshteinA J Blume
Jul 1, 1979·The Journal of Physiology·J V HOWARTH, J M RITCHIE
Jul 1, 1965·The Journal of Physiology·R D Keynes, J M RITCHIE
Feb 18, 1958·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·B C ABBOTTJ V HOWARTH
Jan 16, 1933·The Journal of Physiology·M Beresina, T P Feng

Citations

Sep 7, 1983·Journal of Theoretical Biology·R de A Nogueira, E A Conde Garcia
Mar 31, 2015·Nature Communications·Ahmed El Hady, Benjamin B Machta
Mar 22, 2007·Physics in Medicine and Biology·Denis Le Bihan
Mar 15, 2020·Physical Review. E·Aymar C L de LichterveldeMartin Z Bazant
Nov 1, 1985·Quarterly Reviews of Biophysics·J M RITCHIE, R D Keynes

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Nerve Impulses
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