Adaptive changes in membrane lipids of barophilic bacteria in response to changes in growth pressure

Article Abstract:

A study was conducted to analyze the lipid compositions of barophilic bacterial strains which contained docosahexaenoic acid (DHA) as well as to investigate the adaptive changes of these compositions in response to growth pressure. In the barophilic strain 16C1, phosphatidylethanolamine (PE) and phosphatidylglycerol (PG) were major components which had the same fatty acid chains. In PG, DHA accounted to 29.6% of the total fatty acids while in PE, DHA accounted for only 3.7% of the total fatty acids. Saturated fatty acids in PE were reduced in response to an increase in growth pressure.

Fatty acids

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Distribution of polyunsaturated fatty acids in bacteria present in intestines of deep-sea fish and shallow-sea poikilothermic animals

Article Abstract:

The distribution of polyunsaturated fatty acids (PUFAs) in bacteria present in intestines of deep-sea fish and shallow-sea poikilothermic animals was examined to prove the presence of PUFAs in obligate and facultative barophiles. Fatty acid analyses reveal that all obligately and facultatively barophilic bacteria contained docossahexaenoic acid and eicosapentaenoic acid in the lipids. Aside from the large amounts of PUFAs, fatty acid compositions were typical in shallow sea environments.

Unsaturated fatty acids, Poikilotherms, Ectothermy

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Population sizes and growth pressure responses of intestinal microfloras of deep-sea fish retrieved from the abyssal zone

Article Abstract:

The intestines of deep-sea fish contain a large number of bacteria which are mainly barophilic. The size of the bacteria populational and number of culturable cells is more at in situ pressures than atmospheric pressure. The facultative and obligate barophilic bacteria play a major role in the intestinal microfloras while barotolerant bacteria have a minor role. The intestines of deep-sea fish probably supply sufficient nutrients to maintain significant bacterial growth in the deep sea.

Analysis, Natural history, Bacterial growth, Abyssal zone, Fishes, Deep-sea, Deep-sea fishes

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