Elemental sulfur and thiosulfate disproportionation by Desulfocapsa sulfoexigens sp. nov., a new anaerobic bacterium isolated from marine surface sediment

Article Abstract:

A study was conducted on the enrichment, isolation and phylogenetic affiliation of Desulfocapsa sulfoexigens sp. nov., also known as strain SB164P1, which thrives exclusively chemolithoautotrophically by elemental sulfur, thiosulfate, and sulfite disproportionation. The use of comparative 16S rDNA sequencing analysis put strain SB164P1 into the delta subclass of Proteobacteria. Such phylogenetic cluster of organisms forms one of the main lines of descent within the delta subclass of the Proteobacteria.

Microbiology, Genetic recombination, Marine sediments, Sulfur bacteria

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Complete oxidation of propionate, valerate, succinate, and other organic compounds by newly-isolated types of marine, anaerobic, mesophilic, gram-negative, sulfur-reducing eubacteria

Article Abstract:

The isolation and characterization of five new strains of mesophilic completely-oxidizing anaerobic sulfur-reducing bacteria capable of degrading a wide range of organic substrates were reported. All strains were gram-negative and grew by complete oxidation of organic compounds to CO2 and reduction of elemental sulfur to hydrogen sulfide. They were able to utilize acetate, propionate, lactate, pyruvate, succinate, oxaloacetate, maleinate, alanine, aspartate, glutamate and yeast extract.

Physiological aspects, Biodegradation, Oxidation, Physiological, Physiological oxidation, Organic compounds

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Bacterial disproportionation of elemental sulfur coupled to chemical reduction of iron or manganese

Article Abstract:

The utilization of elemental sulfur as enrichment for bacteria oxidizing hydrogen sulfide is discussed. The stoichiometries of the enrichments were determined bysubculturing. Nonsuppressed anion exchange chromatography was used to measure sulfate and epifluorescence microscopy counted the cells. The anaerobic sulfideoxidation in sediments was found to be caused by the coupling of sulfur diproportionation with iron or manganese reduction.

Analysis, Usage, Microbial metabolism, Oxidation-reduction reaction, Oxidation-reduction reactions, Sulfur

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