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1963) for the cytoplasmic membrane of the same bacterium. The latter workers found that the membrane lipids contained only "phosphatidic" acids, as was found for membranes from other bacteria ( see Section ΙΙΙ,Β ). , 1963), the question arises as to why the lysine-containing phosphatide found in cells was not detected in the membrane. It seems reasonable to suggest, as did Macfarlane (1962b), that enzymes are present in the bacteria which would hydrolyze the amino acid ester linkage to phosphatidylglycerol, and that this reaction could occur during the process of isolation of the membrane.

Jaecalis and P. 5, respectively, and most of the nitrogen was accounted for by the presence of lipid-bound, acidand alkali-labile L-lysine, as was found for the Lactobacillus species. The phosphatides of L. 2) but most of the nitrogen was accounted for by lipid-bound D-alanine. These amino acid-containing phosphatides may likely be O-amino acid esters of phosphatidylglycerol (Macfarlane, 1962b). As was found for the lactobacilli, the phosphatide fractions here also did not contain any detectable choline, ethanolamine, serine, or inositol.

The main components were normal free fatty acids (44%, including Ci 4 , Ci 6 , Ci 8 , palmitoleic, and oleic acids, both as sodium salts and free acids), free hydroxy acids (28%, including corynomycolic and corynomycolenic acids), triglycérides ( 8 % ) , di- (or mono-) glycerides and monoesters of ethylene glycol ( 4 % ) , phosphatides (6%, chiefly a phosphatidylinositol dimannoside ), unsaponifiable material ( 6%, chiefly palmitone), and traces of glycolipids (trehalose esters). The unusually high quantities of free fatty acids may have arisen from enzymatic hydrolysis of glycerides (cf.

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