[Histochemical study of the digestive organs of rats on board for the space flight of the satellite "Cosmos-690"]. / Gistokhimicheskoe issledovanie organov pishchevareniia krys, nakhodivshikhsia v kosmicheskom polete na sputnike "Kosmos-690".

The digestive organs of rats exposed to a combined effect of space flight factors and irradiation were examined. The surface and foveal epithelium of the stomach as well as mucocytes of the fundal glands showed a drastically reduced content of the neutral carbohydrate component. The foveal epithelium and mucocytes of fundal necks also exhibited a significant decrease of the sulfomucin content. The large and small intestines showed a lowered amount of goblet-cells and their secretion. Pancreatic acinar cells displayed different changes in the content of enzymic proteins having cation properties. The above histochemical changes did not return to normal 36 days after irradiation and 26--27 days after readaptation to the Earth environment.

[Histochemical study of the digestive organs of rats after a flight on "Kosmos-605"]. / Gistokhimicheskoe issledovanie organov pishchevareniia krys posle poleta na "Kosmos-605".

The histochemical study of the stomach, small and large intestines and pancreas of rats flown aboard the biosatellite Cosmos-605 as well as of synchronous and vivarium controls demonstrated a significant decline in the mucine producing capacity of epithelial cells of the stomach of the flight rats on the R + 1 day. The study showed an increased content of sialo- and sulphosaccharides in goblet cells of cryptae of large intestine and a reduced content of free cation protein in the acinar cells of the pancreas of flight rats. The changes were transient and disappeared by the R + 26 day.