[Ca(2+) level in the animal blood and their cold resistance].

Administration of small doses of the EDTA decreased by 15-20% the Ca2+ contentn in the blood plasma of rabbits and rats. The decrease coincided with an abrupt stimulation of the thermoregulation system of cooled animals. Restoration of the Ca2+ content in circulating blood coincided in time with repeated suppression of the system's functions.

[Effect of ammonium ions on calcium release from fragmented sarcoplasmic reticulum].

It is established that in AMP deamination by sarcoplasmic reticulum fragments there occurs an intensified release of the previously accumulated calcium. UMP has no noticeable effect on this process. The level of accumulated 45Ca+ in the fragmented sarcoplasmic reticulum is decreased when ammonium ions load is introduced into the medium.