Abstract
Pullularia pullulans cells were grown in a medium containing yeast extract, malt extract, glucose, and nutrient salts, in addition to glucose-1-14C. The lipids extracted from the cells were fractionated by use of a single column packed with silicic acid. Of the total radioactive carbon added to the culture medium, the neutral lipid fractions contained 24.8%, whereas the phospholipid portions contained only 2.1%. The largest amount (16.5%) of 14C among the neutral lipids was found in the fraction containing the free sterols. Among the phospholipids, the largest amount (1.1%) was found in phosphatidylserine and phosphatidylethanolamine. The second largest amount (9.6%) of the total 14C used was found in trehalose, followed by carbon dioxide (7.3%).
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