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Arrhenius parameters of mitochondrial membrane respiratory enzymes in relation to thermoregulation in endotherms

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Summary

  1. 1.

    The relationship, between the body temperature (T b), the Arrhenius critical temperature (T *), and the apparent activation energy aboveT *) (E a1), of liver and heart mitochondrial respiratory enzymes from eleven homeothermic and eight heterothermic species was determined using a linear regression analysis.

  2. 2.

    An inverse relation was observed between,T * andE a1 during torpor and hibernation.

  3. 3.

    In all thermoregulatory states,T * decreased withT b andT * was equal to or belowT b.

  4. 4.

    During torporE a1 increased in a linear manner asT b was lowered.

  5. 5.

    It appears that the above Arrhenius parameters are closely linked to the thermoregulatory state of endotherms and thus may represent an, adaptation for function at lowT b's.

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Abbreviations

E a :

apparent activation energy

T * :

Arrhenius critical temperature

T b :

body temperature

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Authors and Affiliations

  1. School of Biological Sciences, The Flinders University of South Australia, Bedford Park, 5042, Adelaide, SA, Australia

    Fritz Geiser

  2. Division of Human Nutrition, Glenthorne Laboratory, CSIRO (Australia), Majors Road, O'Halloran Hill, 5158, SA, Australia

    Edward J. McMurchie

Authors
  1. Fritz Geiser
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  2. Edward J. McMurchie
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Present address: University of Washington, Department of Zoology, Seattle, WA 98195, USA

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Geiser, F., McMurchie, E.J. Arrhenius parameters of mitochondrial membrane respiratory enzymes in relation to thermoregulation in endotherms. J Comp Physiol B 155, 711–715 (1985). https://doi.org/10.1007/BF00694585

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