Abstract
1. 1. Plasma free amino acids, adrenocortical activity, protein and nucleic acid content in the liver were studied in the hibernating, aroused and normothermic ground squirrel ( Citellus citellus). 2. 2. In the aroused animals tested after body temperature reached 36°C the level of plasma free amino acids was higher than in hibernating ones, as well as in normothermic controls studied in summer. The hibernation was linked with lowering of plasma free amino acids level in respect to the normothermic control. The only exception was found in cystine. 3. 3. Protein and RNA content in the liver were higher in aroused animals than in hibernating ones. Protein content was higher in aroused than in normothermic controls studied in summer. 4. 4. The level of 17-hydroxycorticosteroids (17-OHCS) in plasma was increased during the arousal; it was also higher in aroused in respect to the normothermic controls. 5. 5. Adrenal ascorbic acid concentration decrease during the arousal, being lower than in normothermic controls, as well.
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