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[Cerebral synaptosome ATPase activity in Citellus erythrogenys susliks during periods of wakefulness and hibernation].

The activity of synaptosomal Mg- and Na, K-ATPases has been compared during natural hibernation and active periods in ground squirrels. Being assayed in vitro at temperature 37 degrees, the activity of Na, K-ATPase decreases during hibernation by 25%, that of Mg-ATPase--by 37%. The decreased level of the activity of these enzymic systems may result from structural alterations in the brain membranes during hibernation of the animals.