[Changes in the electrolyte composition of the heart, liver and kidneys of the rat in pre- and postnatal ontogeny].

From the 19th day of embryonic period, within 4 days, i. e. up to the beginning of postnatal life, the weight of the heart in rats increases by 3.

[Dynamics of water, electrolyte and trace element content of the placenta, fetuses and organs of female rats during pregnancy].

From the 15th to 21st day of pregnancy the mass of foetus increases by 23.5 times in rats; water content decreases from 10.90 +/- 0.