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[Effect of stress on nucleic acid metabolism in the rat spleen and liver after a flight on the Kosmos-1129 biosatellite].

Changes in nucleic acid metabolism of the spleen and liver of rats flown for 18.5 days on Cosmos-112 were investigated. Postflight changes in the liver RNA synthesis after an additional stress effect (immobilization) in the flown rats were expressed to a lesser degree than in the controls. The DNA synthesis remained essentially at the preflight level. The tissue content of nucleic acids suggests that postflight the dystrophic changes induced by the additional stress effect increased. It is very likely that an exposure to space flight effects contributes to the depletion of compensatory mechanisms maintaining the normal level of metabolic processes.