Physiological responses to starvation in the marine oligotrophic ultramicrobacterium Sphingomonas sp. strain RB2256

Article Abstract:

The marine oligotrophic ultramicrobacterium Sphingomonas sp. strain RB2256 and its physiological responses to starvation are discussed. Marine oligotrophic ultramicrobacteria likely include a starvation response and capacity for a high level of gene regulation. Ribosome synthesis is not directly linked to protein synthesis. Function of ribosomes may not be limited to translation.

Australia, Genetic aspects, Ribosomes, Genetic translation, Translation (Genetics)

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Specific growth rate plays a critical role in hydrogen peroxide resistance of the marine oligotrophic ultramicrobacterium Sphingomonas alaskensis strain RB2256

Article Abstract:

The marine oligotrophic ultramicrobacterium Spingomonas alaskensis becomes 10,000 times more resistant to stress under nutrient-limited growth conditions. This is the first demonstration of variable stress resistance in a bacterium under carbon and energy limitation.

Stress (Physiology), Starvation

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Responses to stress and nutrient availability by the marine ultramicrobacterium Sphingomonas sp. strain RB2256

Article Abstract:

The marine bacterium Sphingomonas sp. strain RB2256 displays physiological and molecular characteristics that permit it to grow in large numbers in seawater. Growing cells of the strain are unaffected by nutrient starvation and conditions such as high temperature, ethanol, and hydrogen peroxide. Starved cells also show similar responses. The stress resistance mechanisms differ from those of nondifferentiating bacteria. The growth rates immediately revert back to high levels on a sudden exposure of starved cells to high concentrations of glucose.

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