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Extractable Lipids of Gram-Negative Marine Bacteria: Phospholipid Composition

^a Department of Biology, Georgetown University, Washington, D.C. 20007

ABSTRACT

Phospholipid compositions of 20 strains of marine and estuarine bacteria were determined. Results showed that phospholipids of marine bacteria differed very little from those of nonmarine organisms with phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol being the predominant phospholipids in all strains examined. Lyso-phosphatidylethanolamine occurred in significant quantities among a number of the marine bacteria, and two of the isolates contained significant quantities of poly-ß-hydroxybutyrate. Effects of age and growth temperature on the phospholipid composition were also investigated. It is suggested that phylogenetic relationships among bacteria may be correlated with phospholipid composition.

¹ Present address: Department of Biochemistry, University of Ottawa, Ottawa 2, Canada.

² Present address: Department of Microbiology, University of Maryland, College Park, Md. 20742.

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