Effect of sexual cycle on red cell membrane permeability as revealed by influx of Rubidium-86 and adenosinetriphosphatase in female rats.

Red cell membrane permeability, as revealed by influx of Rubidium-86 and ATPase activity, was studied in different phases of sexual cycle in female rats and no significant changes have been found.

Study of sodium homeostasis in blood in whole body gamma- irradiated rats.

Adult male rats were subjected to whole body irradiation of 400 and 1000 rads and sodium homeostasis in blood was studied on the 1st, 4th and 7th days after exposure. A significant decrease in red cell adenosine triphosphatase, progressive loss of erythrocytic potassium and alteration in influx and efflux of sodium 22 in red cells in vitro were observed in these rats.

Combined stress of low environmental pressure and temperature on sodium and potassium homeostasis in rat blood.

Adult rats were subjected to the combined stress of low atmospheric pressure and temperature at a simulated altitude of 7620 metres and at 5°C for 5 hours. A significant increase in the influx of rubidium-86 and the efflux of sodium-22 was observed in erythrocytes of experimental rats in vitro. Blood 2,3-diphosphoglycerate was appreciably enhanced while blood sodium and reduced glutathione contents in the experimental animals remained unchanged.