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Different temperature dependences of oxidative phosphorylation in the inner and outer layers of tuna heart ventricle

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Summary

  1. 1.

    The oxidative phosphorylation and the temperature dependence of mitochondria prepared from the outer compact layer and the inner spongy layer of adult tuna heart ventricle have been examined.

  2. 2.

    Mitochondria of the inner layer show higher succinoxidase and NADH-oxidase activities as compared with those of the outer layer.

  3. 3.

    Arrhenius plots for succinate oxidation by phosphorylating mitochondria show that the temperature dependence of the inner layer is higher than that of the outer layer.

  4. 4.

    Experiments performed with disrupted non-phosphorylating mitochondria demonstrate that this difference in temperature dependence of the two cardiac compartments depends on the integrity of the mitochondrial membranes.

  5. 5.

    These findings are discussed in relation to the physiology of the fish.

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References

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Maresca, B., Modigh, M., Servillo, L. et al. Different temperature dependences of oxidative phosphorylation in the inner and outer layers of tuna heart ventricle. J Comp Physiol B 105, 167–172 (1976). https://doi.org/10.1007/BF00691118

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Keywords

  • Oxidation
  • Human Physiology
  • Succinate
  • Mitochondrial Membrane
  • Outer Layer