[Effect of thyroxine on the energy processes of liver and heart tissue in embryogenesis].

The influence of various amounts (0.008; 0.0025; 0.

[Effect of thyroid hormones on cytochrome concentration on the liver and heart tissues of chickens during ontogenesis].

Changes in the concentration of cytochromes c, c1 and a in the liver and heart homogenates during chick pre- and postnatal development were detected by means of low temperature differential spectrometry. At the early stages of development the high content of respiratory enzymes comparable with that in the adult organism is noted. By the end of embryogenesis the content of cytochromes decreased and, subsequently, increased.