Abstract
Summary
Pyruvate saturation curves and NADHL/NADHH ratios show that the predominant LDH isozymes of avian ventricle and pectoralis muscle are catalytically similar to those of several other vertebrates, including man. The hypothesized relationship between type of metabolism and predominant LDH isozymes and between type of metabolism and degree of susceptibility to excess pyruvate are incongruous; our results suggest that neither hypothesis may be consistently correct. This is supported by observations on reversal in predominant isozymes of some avian tissues, and on differences in electro-phoretic and kinetic properties of house sparrow ventricle and cerebrum, as well as published exceptions.
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