... indicate that ancient vertebrates,such as agnathans, possess a low activity rbc CA isozyme, whereas more recently evolved vertebrates, such as teleost fish, possess a high activity isozyme. At present, however, the changes in the molecular structure that have resulted in this large increase in catalytic...

...A. J. Esbaugh; S. F. Perry; M. Bayaa; T. Georgalis; J. Nickerson; B. L. Tufts; K. M. Gilmour SUMMARY It is well established that the gills of teleost fish contain substantial levels of cytoplasmic carbonic anhydrase (CA), but it is unclear which CA isozyme(s) might be responsible for this activity...

... ) and the possible relevance of LDH allelic variability for thermal acclimation. Two groups of fishes were acclimated to 4°C or 12°C for one year. Polymorphism was observed in only one ( Ldh-B ) of the three Ldh loci expressed in cod liver and/or muscle. Isozyme expression remained unchanged regardless...

...John E. Wilson SUMMARY The first step in metabolism of glucose (Glc) is usually phosphorylation,catalyzed by hexokinase. However, the Glc-6-P produced can then enter one or more of several alternative pathways. Selective expression of isozymic forms of hexokinase, differing in catalytic...