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[The effect of the antibiotic AL-87 on the amino acid yield from Staphylococcus aureus 209P cells].

Antibiotic AL-87 has been studied for its effect on the composition of intracellular free amino acids and of amino acids in culture fluid of Staphylococcus aureus 209 P. It is established that the content of amino acids in the culture fluid of S. aureus 209 P is doubled due to antibiotics, while the content of intracellular free amino acids considerably decreases. Spectrum of free amino acids of S. aureus 209 P is presented by 17 basic amino acids. When there is a sub-bacteriostatic concentration of the antibiotic in the medium all free amino acids tend to leave the cells, the content of aspartic acid, serine, threonine and leucine in the medium being increased. Data obtained when studying the effect of antibiotic AL-87 on the composition of free amino acids of Staphylococcus agree well with the previously obtained results from the study of the fatty acid composition of cells. In the light of these data it may be supposed that an increase of the membrane permeability and as a result of it an outlet of amino acids into the medium is one of constituents of the mechanism of antibiotic AL-87 action on Staphylococcus cells.