Abstract
Summary
Heart, kidney, liver, and brain of the cow, rat, and mouse were assayed for maximal activity of succinoxidase and malic dehydrogenase. The levels of the two enzymes generally reflect the inverse relationship of metabolism with body size in that the tissues of the cow were lowest, those of the rat intermediate, and those of mouse highest in activity for these enzymes. The enzyme levels did not vary as an exact power function of body weight, nor were there any intraspecific changes in enzyme levels with changes in body size.
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