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Sulfur-reducing bacteria are microorganisms able to reduce elemental sulfur (S0) to hydrogen sulfide (H2S). These microbes use inorganic sulfur compounds as electron acceptors to sustain several activities such as respiration, conserving energy and growth, in absence of oxygen. The final product of these processes, sulfide, has a considerable influence on the chemistry of the environment and, in addition, is used as electron donor for a large variety of microbial metabolisms. Several types of bacteria and many non-methanogenic archaea can reduce sulfur. Microbial sulfur reduction was already shown in early studies, which highlighted the first proof of S0 reduction in a vibrioid bacterium from mud, with sulfur as electron acceptor and H
2 as electron donor. The first pure cultured species of sulfur-reducing bacteria, Desulfuromonas acetoxidans, was discovered in 1976 and described by Pfennig Norbert and Biebel Hanno as an anaerobic sulfur-reducing and acetate-oxidizing bacterium, not able to reduce sulfate. Only few taxa are true sulfur-reducing bacteria, using sulfur reduction as the only or main catabolic reaction. Normally, they couple this reaction with the oxidation of acetate, succinate or other organic compounds. In general, sulfate-reducing bacteria are able to use both sulfate and elemental sulfur as electron acceptors. Thanks to its abundancy and thermodynamic stability, sulfate is the most studied electron acceptor for anaerobic respiration that involves sulfur compounds. Elemental sulfur, however, is very abundant and important, especially in deep-sea hydrothermal vents, hot springs and other extreme environments, making its isolation more difficult. Some bacteria – such as Proteus, Campylobacter, Pseudomonas and Salmonella – have the ability to reduce sulfur, but can also use oxygen and other terminal electron acceptors.
Thermoanaerobacter is a genus in the phylum Bacillota (Bacteria). Members of this genus are thermophilic and anaerobic, several of them were previously described as Clostridium species and members of the now obsolete genera Acetogenium and Thermobacteroides
Desulfosporosinus is a genus of strictly anaerobic, sulfate-reducing bacteria, often found in soil.
Cellulophaga algicola is a bacterium. It was first isolated from the surfaces of the chain-forming sea-ice diatom Melosira. It is most similar to Cellulophaga baltica. Its type strain is IC166T.
"Syntrophothermus lipocalidus" is a bacterium, the type species and only currently described species in its genus. It is thermophilic, syntrophic, fatty-acid-oxidizing and anaerobic, and utilises isobutyrate. TGB-C1T is its type strain. Its genome has been fully sequenced.
Holophaga foetida is a bacterium, the type species of its genus. It is a homoacetogenic bacterium degrading methoxylated aromatic compounds. It is gram-negative, obligately anaerobic and rod-shaped, with type strain TMBS4. Its genome has been sequenced. It is known for its ability to anaerobically degrade aromatic compounds and the production of volatile sulfur compounds through a unique pathway.
Dethiosulfovibrio peptidovorans is an anaerobic, slightly halophilic, thiosulfate-reducing bacterium. Its genome has been sequenced. It is vibrio-shaped, gram-negative and possesses lateral flagella. It is non-spore-forming. Its type strain is SEBR 4207T.
Desulfohalobium retbaense is a bacterium and serves as the type species of its genus. It is halophilic, sulfate-reducing, motile, nonsporulating and rod-shaped with polar flagella. The type strain is strain DSM 5692. Its genome has been sequenced.
Sulfuricurvum kujiense is a facultatively anaerobic, chemolithoautotrophic, sulfur-oxidizing bacterium, the type species of its genus. Its cells are motile, curved rods and have a single polar flagellum. Its type strain is YK-1T.
Desulfurobacterium thermolithotrophum is a species of autotrophic, sulphur-reducing bacterium isolated from a deep-sea hydrothermal vent. It is the type species of its genus, being thermophilic, anaerobic, Gram-negative, motile and rod-shaped, with type strain BSAT.
Thermosinus carboxydivorans is an anaerobic, thermophilic, Gram-negative, carbon-monoxide-oxidizing, hydrogenogenic bacterium, the type species of its genus. It is facultatively carboxydotrophic, curved, motile, rod-shaped, with a length of 2.6–3 μm, a width of about 0.5 μm and lateral flagellation. Its type strain is Nor1T.
Muricauda is a genus in the phylum Bacteroidota.
Microbacterium gubbeenense is a Gram-positive, facultatively anaerobic, non-spore-forming and non-motile bacterium from the genus Microbacterium which has been isolated from the surface of a smear-ripened cheese in Ireland.
Xylanimonas cellulosilytica is a Gram-positive, xylanolytic, aerobic, coccoid and non-motile bacterium from the genus Xylanimonas which has been isolated from a decayed tree in Salamanca, Spain. Xylanimonas cellulosilytica has the ability to hydrolyze cellulose and xylan.
Paludibacter is a Gram-negative, strictly anaerobic, chemoorganotrophic and non-motile genus from the phylum Bacteroidota.
Paludibacter propionicigenes is a Gram-negative, strictly anaerobic, non-spore-forming and non-motile bacterium from the genus of Paludibacter which has been isolated from rice plant residue in Yamagata on Japan. Paludibacter propionicigenes produces propionate and acetate from glucose fermentation and is classified as a saccharolytic fermenter.
Olsenella is a Gram-positive, non-spore-forming, obligate anaerobic and non-motile bacterial genus from the family Atopobiaceae. Olsenella is named after the microbiologist Ingar Olsen. Olsenella bacteria are involved in endodontic infections in humans.
Aminobacterium colombiense is a Gram-negative, mesophilic, strictly anaerobic and non-spore-forming bacterium from the genus of Aminobacterium which has been isolated from anaerobic lagoon from a dairy wastewater treatment plant in Colombia.
Kyrpidia tusciae is a species of Gram positive, facultatively anaerobic, thermophilic bacterium. The cells are rod-shaped and form spores.
Raoultella electrica is a Gram-negative, non-spore-forming, rod-shaped bacterium of the genus Raoultella. The type strain of R. electrica was isolated from anodic biofilms of a microbial fuel cell fed with glucose.
References
- ↑ Bruns, A.; Rohde, M.; Berthe-Corti, L. (2001). "Muricauda ruestringensis gen. nov., sp. nov., a facultatively anaerobic, appendaged bacterium from German North Sea intertidal sediment". International Journal of Systematic and Evolutionary Microbiology. 51 (6): 1997–2006. doi: 10.1099/00207713-51-6-1997 . ISSN 1466-5026. PMID 11760940.
