Chemistry of the Chick Embryo
نویسنده
چکیده
Despite voluminous literature describing the chemical changes which accompany development of the chick embryo, there are few quantitative data on the occurrence of respiratory and glycolytic enzymes and coenzymes. Since these catalysts are concerned with reactions which may be available for the processes of growth and differentiation, more knowledge of their activities during the incubation period is desirable. The functional existence, in early chick embryos, of DPN and of a glycolytic system requiring DPN (diphosphopyridine nucleotide, coenzyme I) has been denied by Needham and Lehmann (10). However, Meyerhof and Perdigan (8) were able to demonstrate phosphorylative glycolysis and DPN activity in 4 to 9 day chick embryos. Novikoff, Potter, and LePage (11) extended these observations to the estimation of the amounts of typical intermediates in 3 to 10 day embryos, the demonstration of phosphorylative glycolysis in extracts, and the existence of significant quantities of DPN in extracts. None of the data is sufficiently extensive for the evaluation of the accumulation rate of DPN in the developing chick. The present report presents the results of the estimation of DPN in about 250 chick embryos ranging in age from 2 to 19 days.
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