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Thermus is a genus of thermophilic bacteria. It is one of several bacteria belonging to the Deinococcota phylum. Thermus species can be distinguished from other genera in the family Thermaceae as well as all other bacteria by the presence of eight conserved signature indels (CSIs) found in proteins such as adenylate kinase and replicative DNA helicase as well as 14 conserved signature proteins (CSPs) that are exclusively shared by members of this genus.
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 or 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 H2 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.
Microbulbifer is a genus of bacteria found in high-salt environments. Members of this genus can degrade complex carbohydrates such as cellulose, alginate, and chitin. Recently, Microbulbifer degredans was renamed Saccharophagus degredans.
Alteromonas is a genus of Pseudomonadota found in sea water, either in the open ocean or in the coast. It is Gram-negative. Its cells are curved rods with a single polar flagellum.
In taxonomy, Natrialba is a genus of the Halobacteriaceae. The genus consists of many diverse species that can survive extreme environmental niches, especially they are capable to live in the waters saturated or nearly saturated with salt (halophiles). They have certain adaptations to live within their salty environments. For example, their cellular machinery is adapted to high salt concentrations by having charged amino acids on their surfaces, allowing the cell to keep its water molecules around these components. The osmotic pressure and these amino acids help to control the amount of salt within the cell.
Porphyromonas is a Gram-negative, non-spore-forming, obligately anaerobic and non-motile genus from the family of Porphyromonadaceae. This genus has been found to be part of the salivary microbiome. The use of targeted 16S rRNA gene metagenomic sequencing has shown that the genus is well represented in healthy individuals from the Human Microbiome Project.
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
Actinopolyspora is a genus in the phylum Actinomycetota (Bacteria).
Dactylosporangium is a genus in the phylum Actinomycetota (Bacteria).
Desulfosporosinus is a genus of strictly anaerobic, sulfate-reducing bacteria, often found in soil.
Mesorhizobium tianshanense, formerly known as Rhizobium tianshanense, is a Gram negative species of bacteria found in the root nodules of many plant species. Its type strain is A-1BS.
Syntrophus buswellii is a bacterium. It is a motile, gram-negative, anaerobic rod-shaped organism which catabolises benzoate.
Prevotella albensis, previously known as Bacteroides ruminicola subsp. ruminicola, is a species of bacterium.
Sphingomonas stygia is a species of bacteria. It is an aromatic compound-degrading bacteria, it is gram-negative, non-spore-forming, non-motile and rod-shaped. It is found in deep-terrestrial-subsurface sediments.
Pedomicrobium americanum is a bacterium from the genus of Pedomicrobium which has been isolated from freshwater in New York in the United States.
Desulfuromonas is a Gram negative bacterial genus from the family of Desulfuromonadaceae. Desulfuromonas can reduce elemental sulfur to H2S. Desulfuromonas occur in anoxic sediments and saline lakes.
Novosphingobium aromaticivorans is a species of bacteria. It is an aromatic compound-degrading bacteria, it is gram-negative, non-spore-forming, non-motile and rod-shaped. It is found in deep-terrestrial-subsurface sediments.
Thermonema is a Gram-negative, chemoheterotrophic and aerobic genus from the phylum Bacteroidota.
Janibacter terrae is a bacterium from the genus of Janibacter which has been isolated from soil in Korea. Janibacter terrae is able to degrade trichloroethylene. Janibacter brevis was originally classified as its own species, but was later found to be a heterotypic synonym of J. terrae.
Alkalicoccus is a genus of Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Alkalicoccus saliphilus.
References
- ↑ Krumholz, L. R. (1997). "Desulfuromonas chloroethenica sp. nov. Uses Tetrachloroethylene and Trichloroethylene as Electron Acceptors". International Journal of Systematic Bacteriology. 47 (4): 1262–1263. doi: 10.1099/00207713-47-4-1262 . ISSN 0020-7713.
