[Biochemical changes in mouth fluid in people with acute emotional stress exposed to natural and increased radiation]. / Izmenenie biokhimicheskikh pokazatelei, kharakternykh dlia ostrogo émotsionalnogo stressa, v rotovoi zhidkosti u liudei v usloviiakh estestvennogo i povyshennogo fonov radioaktivnosti.

Acute emotional stress in people is followed by changes in oral fluid composition (sialic acid, components of proteolytic system, lipid of peroxidation products). The possibility to use these indices for estimation of the psychoemotional stress in people is based.

[Effect of acute stress on glucose resorption by an isolated loop of the small intestine]. / Vliianie ostrogo stressa na rezorbtsiiu gliukozy izolirovannoi petlei tonkoi kishki.

In the experiments on rats acute stress is found to accelerate glucose resorption by isolated loop of small intestine in situ and it probably depends on increased level of corticosteroids. Glucose resorption changes in small intestine is of adaptable character during stress.

[Decrease in cAMP levels and increase in cGMP levels in the small intestine mucosa after treatment with fluoride]. / Snizhenie soderzhaniia cAMP i povyshenie cGMP v slizistoi tonkogo kishechnika krys pod vliianiem ftora.

Sodium fluoride was studied for its effect on the cAMP and cGMP amount in the small intestine mucosa of rats under conditions of acute and chronic experiments. A significant decrease in the cAMP level and an increase in the cGMP level were revealed in both cases. Changes in the content of cyclic nucleotides were followed by marked changes in their physiologically important ratios.

[Effect of fluorine on enzyme activity in the small intestine mucosa during absorption of sodium, potassium, monosaccharides and amino acids]. / Fliianie ftora na aktivnost' fermentov slizistoi tonkoi kishki pri vsasyvanii natriia, kaliia, monosakharov i aminokislot.

Effect of NaF on ATP-ase, creatine kinase, acid and basic phosphatases activity of small intestine mucosa in white rats during enteral administration of NaCl, KCl solutions has been studied under conditions of acute experiment. Inhibition of the Mg2+-ATP-ase activity by 13%, general ATP-ase activity by 25%, creatine kinase by 22% and a 2.2-3 fold inhibition of Na, K+-ATP-ase activity is observed. Acid and basic phosphatase activity does not change, swelling of mucosa is observed. The acid phosphatase activity in the intestinal contents increases 1.5 times, basic phosphatase activity--1.7 times, creatine amount--1.7 times, Pi amount 1.8 times. In experiments in vitro F- produces 20% activation of the basic phosphatase of mucosa and a 2.6-fold inhibition of the acid phosphatase. Rate of fructose absorption falls by 34%, that of methionine--by 29%, glucose--by 24%, glutaminic acid--by 10%. Activity of general ATP-ase in this case decreases by 22, 15, 27, 20% respectively. It is supposed that the F- effect results in destabilization of the membrane structures of the intestine mucosa.