| Selenomonas lacticifex | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Bacillota |
| Class: | Negativicutes |
| Order: | Selenomonadales |
| Family: | Selenomonadaceae |
| Genus: | Selenomonas |
| Species: | S. lacticifex |
| Binomial name | |
| Selenomonas lacticifex Schleifer et al. 1990 | |
Selenomonas lacticifex is a species of anaerobic, Gram-negative, rod-shaped bacteria first isolated from spoilt beer. [1]
In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.
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.
The genus Selenomonas constitutes a group of motile crescent-shaped bacteria and includes species living in the gastrointestinal tracts of animals, in particular the ruminants. A number of smaller forms discovered with the light microscope are now in culture but many, especially the large selenomonads are not, owing to their fastidious and incompletely known growth requirements.
Prevotella melaninogenica is a species of bacterium in the normal microbiota of the upper respiratory tract. It is an important human pathogen in various anaerobic infections, often mixed with other aerobic and anaerobic bacteria. P. melaninogenica is an anaerobic, Gram-negative rod, named for its black colonies, and black pigment.
Actinobacillus is a genus of Gram-negative, nonmotile and non-spore-forming, oval to rod-shaped bacteria occurring as parasites or pathogens in mammals, birds, and reptiles. It is a member of the family Pasteurellaceae. The bacteria are facultatively anaerobic or aerobic, capable of fermenting carbohydrates, and of reducing nitrates. The genomic DNA contains between 40 and 47 mol % guanine plus cytosine.
The Synergistota is a phylum of anaerobic bacteria that show Gram-negative staining and have rod/vibrioid cell shape. Although Synergistota have a diderm cell envelope, the genes for various proteins involved in lipopolysaccharides biosynthesis have not yet been detected in Synergistota, indicating that they may have an atypical outer cell envelope. The Synergistota inhabit a majority of anaerobic environments including animal gastrointestinal tracts, soil, oil wells, and wastewater treatment plants and they are also present in sites of human diseases such as cysts, abscesses, and areas of periodontal disease. Due to their presence at illness related sites, the Synergistota are suggested to be opportunistic pathogens but they can also be found in healthy individuals in the microbiome of the umbilicus and in normal vaginal flora. Species within this phylum have also been implicated in periodontal disease, gastrointestinal infections and soft tissue infections. Other species from this phylum have been identified as significant contributors in the degradation of sludge for production of biogas in anaerobic digesters and are potential candidates for use in renewable energy production through their production of hydrogen gas. All of the known Synergistota species and genera are presently part of a single class (Synergistia), order (Synergistiales), and family (Synergistaceae).
The Veillonellaceae are a family of the Clostridia, formerly known as Acidaminococcaceae. Bacteria in this family are grouped together mainly based on genetic studies, which place them among the Firmicutes. Supporting this placement, several species are capable of forming endospores. However, they differ from most other Firmicutes in having Gram-negative stains. The cell wall composition is peculiar.
The Negativicutes are a class of bacteria in the phylum Firmicutes, whose members have a peculiar cell wall with a lipopolysaccharide outer membrane which stains gram-negative, unlike most other members of the Firmicutes. Although several neighbouring Clostridia species also stain gram-negative, the proteins responsible for the unusual diderm structure of the Negativicutes may have actually been laterally acquired from Proteobacteria. Additional research is required to confirm the origin of the diderm cell envelope in the Negativicutes.
Desulfuromonas acetoxidans is a species of bacteria. It is strictly anaerobic, rod-shaped, laterally flagellated and Gram-negative. It is unable to ferment organic substances; it obtains energy for growth by anaerobic sulfur respiration.
Pseudoxanthomonas mexicana is a species of mesophilic, motile, strictly aerobic, Gram-negative, non-spore-forming, rod-shaped bacteria with one polar flagellum, first isolated from human urine, riverside urban soil and anaerobic digester. AMX 26BT is the type strain.
Pseudoxanthomonas japonensis is a species of mesophilic, motile, strictly aerobic, Gram-negative, non-spore-forming, rod-shaped bacteria with one polar flagellum, first isolated from human urine, riverside urban soil and anaerobic digester. 12-3T is the type strain.
Pectinatus frisingensis is a species of anaerobic, Gram-negative, rod-shaped bacteria first isolated from spoilt beer.
Zymophilus paucivorans is a species of anaerobic, Gram-negative, rod-shaped bacteria first isolated from spoilt beer. It is the type species of its genus.
Marinitoga piezophila is a species of rod-shaped, thermo-piezophilic bacteria. It is, anaerobic, chemo-organotrophic, sulfur-reducing, motile, have a mean length of 1-1.5 micrometres and stains Gram-negative. The type strain is KA3T.
Bosea lupini is a bacterium from the genus of Bosea. B. lupini is an aerobic and gram-negative bacterium capable of chemolithoautotrophic growth.
Propionispira raffinosivorans is a motile, obligate anaerobic, gram-negative bacteria. It was originally isolated from spoiled beer and believed to have some causative effect in beer spoilage. Since then, it has been taxonomically reclassified and proven to play a role in anaerobic beer spoilage, because of its production of acids, such as acetic and propionic acid, during fermentation
Cetobacterium is a Gram-negative, pleomorphic, non-spore-forming, rod-shaped and non-motile genus of bacteria from the family of Fusobacteriaceae.
Selenomonas noxia is gram-negative crescent-shaped bacteria included in the genus Selenomonas. Its increase is associated with periodontitis, especially its onset, as well as predominant in 98% of obese women in one study, but also is present in modest amounts in healthy gum tissue.
Endozoicomonas euniceicola is a Gram-negative, facultatively anaerobic and rod-shaped bacterium from the genus of Endozoicomonas which has been isolated from the octocorals Eunicea fusca and Plexaura.
Alloprevotella tannerae is a Gram-negative, obligately anaerobic, non-spore-forming, rod-shaped and non-motile bacterium from the genus of Alloprevotella which has been isolated from a human gingival crevice.
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