Abstract

During the stationary growth phase, the phospholipids of Thiobacillus neapolitanus consisted of phosphatidyl glycerol (PG), diphosphatidyl glycerol (DPG), phosphatidyl-N-monomethylethanolamine (PME) and phosphatidyl ethanolamine (PE) in increasing amounts. In general, the phospholipids increased to a maximum concentration during the stationary phase and then decreased in concentration. Individually, PG and PE increased to a maximum in late lag or early exponential phase and then decreased in concentration. DPG and PME increased during the transition between the exponential and the stationary phase and reached a maximum concentration in the stationary phase. In older cultures, a quantitative interconversion between PG and DPG and PE and PME was observed. A lyso-phospholipid compound also appeared in the late stationary phase.

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