[Free amino acids in the blood before and after short-term space flight]

The amino acid composition of plasma and serum of the crewmembers who performed short-term space flights (of 3 to 14 days) onboard the Salyut-6 orbital station was investigated. Immediately postflight total amino acids remained unchanged while variations in isolated amino acids (tendency toward increased aspartic acid and decreased cysteine in plasma, and increased leucin in serum) were adaptive.