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J Bacteriol. 1975 January; 121(1): 250-258

Comparative analysis of the lipids of Acinetobacter species grown on hexadecane.

ABSTRACT

A comparative analysis of the cellular and extracellular lipids of Acinetobacter species HO1-N indicated basic physiological differences in hexadecane-grown cells. The cellular lipids obtained from hexadecane-grown cells were characterized by 3- and 18-fold increases in the phospholipid fraction and the mono- and diglyceride fraction, respectively, over that obtained from nutrient broth-yeast extract-grown cells. The cellular-associated pools of hexadecane were shown to comprise approximately 8% of the dry cell weight of hexadecane-grown cells. The extracellular lipids obtained from the culture broths of hexadecane-grown cells were comprised of triglyceride, mono- and diglyceride, free fatty acid, and wax ester. These lipids were either absent or present in minor concentrations in the culture broths of nutrient broth-yeast extract-grown cells. The exponential growth of Acinetobacter sp. on hexadecane was characterized by the significant accumulation of free fatty acid, monoglyceride, and diglyceride in the culture medium. Wax ester was shown to represent a minor portion of the extracellular lipids during the exponential growth phase, appearing in significant proportion only after the culture had entered the stationary phase of growth.

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