[Effect of heat and cold on the amylolytic and invertase activity of the small intestine of growing rats].

Acute experiments were conducted on ratlings; it was shown that the action of heat (40-41 degrees C), cold (5-6 degrees C), and ACTH injections (4 units per 100 g of body weight) during the first week after birth led to a sharp reduction of the total (alpha-gamma-conditioned) amylolytic and invertase activity of the homogenates and of the portions of the small intestine (turned inside out) of the growing rats. This depressed condition of the intestinal function was revealed directly after the arrest of the action of the unfavourable factors (7-day rats) and persisted for the subsequent two weeks of the animal life.