Monounsaturated but not polyunsaturated fatty acids are required for growth of the deep-sea bacterium Photobacterium profundum SS9 at high pressure and low temperature

Article Abstract:

Experimental evidence shows that monounsaturated fatty acids play an essential role in the growth of deep-sea bacterium Photobacterium profundum SS9 under low temperature and high pressure conditions. This was gleaned from a study of the effects of conditions changing membrane unsaturated fatty acid levels in the psychrotolerant piezophilic Photobacterium profundum aimed at assessing the importance of membrane unsaturated fatty acids to microbial growth. It was found that the bacterium exhibits improved levels of both monounsaturated and polyunsaturated fatty acids when grown at a reduced temperature or increased pressure.

Research, Unsaturated fatty acids, Low temperatures, High pressure (Science), High pressure (Physics)

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Ecological implications of an improved direct viable count method for aquatic bacteria

Article Abstract:

Microbiological research shows that the direct viable count method can be improved in a number of ways. A combination of replication-inhibiting antibiotics is required to achieve growth inhibition in aquatic bacteria. Growth inhibition can be achieved with lower antibiotic concentrations if longer incubation times are used. Substrate-responsive cells are easily noticeable under these conditions.

Methods, Measurement, Aquatic ecology

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