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[Change in the content and makeup of the phospholipids in the microsomal fraction of rat skeletal muscles under the influence of a flight on the Kosmos-690 biosatellite].

The content and composition of phospholipids in the microsomes isolated from the back femoral muscles of rats flown for 20.5 days aboard the biosatellite Cosmos-690 were studied. Gamma-irradiation applied in the ground-based control experiments did not change the amount of total phospholipids in microsomes of skeletal muscles and altered insignificantly the content of their individual fractions. On the 2nd postflight day a substantial increase in the content of total and fractional phospholipids in microsomes was found. The decrease seems to be induced by weightlessness. On the 26th postflight day the content of total phospholipids returned to the normal whereas their fractional composition still remained changed.