[Effect of ascorbic acid on the intestinal transport of glycine in chick].

The effect of different doses of ascorbic acid on the absorptive functions of the gut has been investigated in chicks. The study describes evidence for the existence of a H+/glycine symport system in chick intestinal brush border, because in sodium-free conditions acidification of the apical medium with ascorbic acid causes a dose-dependent stimulation of glycine absorption. Under the above circumstances, potassium acts as a non-essential activator of H+-dependence glycine cotransport.

[Coupling of protease activity and sodium loading with intestinal absorption of amino acids].

Membrane-bound serine proteases to play a certain role in activation of sodium transport in epithelial cells. To were found explain the protease activity and sodium-dependent L-tryptophan transport across chicken small intestine interaction, four experiments were conducted. One hundred chicks were fed diets that contained 0; 0.

[Effect of various methods of oxygenation in the isolated small intestine on the tryptophan and glycine accumulation].

The impact of various oxygenation types of intestinal preparations (mucosal, serosal and bilateral) on the transepithelial transport of amino acids and peptide according to the character of amino acids, their stereoisometry, incubation time, intestinal gradient and other factors, was investigated in fowl. Against-the-gradient-transport of L-tryptophan and glycine was observed at various oxygenation types, and its intensity decreased in the following sequence: bilateral, mucosal, serosal oxygenation. At various oxygenation types, the accumulation of L-tryptophan occurs more efficiently than that of DL-tryptophan and D-tryptophan.

[The adaptation of the digestive system to carbohydrates in experimental A hypervitaminosis].

High doses of vitamin A exerted no significant effect of the ability of the rat digestive system to adapt to food. The A hypervitaminosis increased the activity of sucrase and eliminated the ability to regulate the activity of this enzyme by the duodenum in the chicken small intestine.