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Biological sciences

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Effects of alternative methyl group acceptors on the growth energetics of the O-demethylating anaerobe Holophaga foetida

Article Abstract:

The energetic and kinetic consequences of sulphide methylation on the growth of the anaerobic homoacetogenic bacterium Holophaga foetida was investigated. Sulphide concentration and pH were monitored and regulated to study the physiological role of sulphide methylation in the metabolism of H. foetida. Holophaga foetida adjusts the energetics of its metabolism to growth conditions to maximize growth rate and growth yield if substrate is in excess and limiting, respectively.

Physiological aspects, Bacteria, Methylation

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Energetics of methanogenic benzoate degradation by Syntrophus gentianae in syntrophic coculture

Article Abstract:

The effect of varying pool sizes of acetate and H2 on benzoate-degrading syntrophic methanogenic associations was analyzed. Concentrations of the substrate and intermediate and end-products of benzoate degradation in cocultures of Syntrophus gentianae were measured. An equivalent of two-thirds of an ATP unit was confirmed to be the minimum energy requirement of the benzoate-fermenting bacterium S. gentianae for growth and energy conservation.

Biodegradation

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Phototrophic oxidation of ferrous iron by a Rhodomicrobium vannielii strain

Article Abstract:

A phototrophic bacterial strain (BS-1) was isolated with ferrous iron as sole energy source in the light. The bacteria was assigned to the Rhodomicrobium genera based on morphological properties such as the formation of swarmer cells and stalked cells attached to the surface. It was also observed that the presence of acetate or succinate as co-substrates stimulate the phototrophic growth of strain BS-1 with ferrous iron as electron donor.

Oxidation-reduction reaction, Oxidation-reduction reactions

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