The influence of phosphorus on the composition of the lipids of Act. olivaceus was studied. It was found that the phosphorus content in the culture medium can serve as a regulator of the synthesis of definite lipids. In the presence of a phosphorus deficiency in the medium (0.0006 g/100 ml), not only the ratio of the polar and neutral fractions, but also the composition of the polar lipids changes, namely: The content of cardiolipin and phosphatidylinositol mannoside is decreased; the content of phosphatidylethanolamine drops from 25.6% to 1.25%. An ornithine-containing lipid is detected among the polar lipids (4--4.5%). Changes in the composition of the membrane lipids are not accompanied by any visible sharp changes in the structural organization of the membrane apparatus.
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