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Purple Bacteria
Purple bacteria or purple photosynthetic bacteria are Gram-negative proteobacteria that are phototrophic, capable of producing their own food via photosynthesis. They are pigmented with bacteriochlorophyll ''a'' or ''b'', together with various carotenoids, which give them colours ranging between purple, red, brown, and orange. They may be divided into two groups – purple sulfur bacteria ( Chromatiales, in part) and purple non-sulfur bacteria ( Rhodospirillaceae). Purple bacteria are anoxygenic phototrophs widely spread in nature, but especially in aquatic environments, where there are anoxic conditions that favor the synthesis of their pigments. Taxonomy Purple bacteria belong to phylum of ''Pseudomonadota''. This phylum was established by Carl Woese in 1987 calling it "purple bacteria and their relatives" even if this is not appropriate because most of them are not purple or photosynthetic. Purple bacteria are distributed between 3 classes:''Alphaproteobacteria'', ''Betap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gammaproteobacteria
Gammaproteobacteria is a class of bacteria in the phylum Pseudomonadota (synonym Proteobacteria). It contains about 250 genera, which makes it the most genera-rich taxon of the Prokaryotes. Several medically, ecologically, and scientifically important groups of bacteria belong to this class. It is composed by all Gram-negative microbes and is the most phylogenetically and physiologically diverse class of Proteobacteria. These microorganisms can live in several terrestrial and marine environments, in which they play various important roles, including ''extreme environments'' such as hydrothermal vents. They generally have different shapes - rods, curved rods, cocci, spirilla, and filaments and include free living bacteria, biofilm formers, commensals and symbionts, some also have the distinctive trait of being bioluminescent. Metabolisms found in the different genera are very different; there are both aerobic and anaerobic (obligate or facultative) species, chemolithoautotrophic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyphomicrobiaceae
The Hyphomicrobiaceae are a family of bacteria. Among others, they include ''Rhodomicrobium'', a genus of purple bacteria. Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature List of Prokaryotic names with Standing in Nomenclature (LPSN) is an online database that maintains information on the naming and taxonomy of prokaryotes, following the taxonomy requirements and rulings of the International Code of Nomenclature ... (LPSN). The phylogeny is based on whole-genome analysis. References Hyphomicrobiales {{Hyphomicrobiales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodopseudomonas Palustris
''Rhodopseudomonas palustris'' is a rod-shaped, Gram-negative purple nonsulfur bacterium, notable for its ability to switch between four different modes of metabolism. ''R. palustris'' is found extensively in nature, and has been isolated from swine waste lagoons, earthworm droppings, marine coastal sediments, and pond water. Although purple nonsulfur bacteria are normally photoheterotrophic, ''R. palustris'' can flexibly switch among any of the four modes of metabolism that support life: photoautotrophic, photoheterotrophic, chemoautotrophic, or chemoheterotrophic. Etymology ''R. palustris'' is usually found as a wad of slimy masses, and cultures appear from pale brown to peach-colored. Etymologically, ''rhodum'' is a Greek noun meaning rose, ''pseudes'' is the Greek adjective for false, and ''monas'' refers to a unit in Greek. Therefore, ''Rhodopseudomonas'', which implies a unit of false rose, describes the appearance of the bacteria. ''Palustris'' is Latin for marshy, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrobacteraceae
The Nitrobacteraceae are a family of gram-negative, aerobic bacteria. They include plant-associated bacteria such as ''Bradyrhizobium'', a genus of rhizobia associated with some legumes. It also contains animal-associated bacteria such as ''Afipia felis'', formerly thought to cause cat-scratch disease. Others are free-living, such as ''Rhodopseudomonas'', a purple bacterium found in marine water and soils. The strain ''Rhodopseudomonas palustris'' DX-1 can generate an electric current with no hydrogen production, a trait being explored in the development of the microbial fuel cell. The genus ''Afipia'' has also been found in the atmosphere, where it uses methylsulfonylmethane as a carbon source.(page 3 and 5 of 6, quotes slightly edited). The bacteria of this family derive their energy from oxidizing ammonia to nitrite, or by oxidizing nitrite to nitrate. They are commonly found in freshwater and soil. Phylogeny The currently accepted taxonomy is based on the List of Prokaryoti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyphomicrobiales
The ''Hyphomicrobiales'' are an order of Gram-negative Alphaproteobacteria. The rhizobia, which fix nitrogen and are symbiotic with plant roots, appear in several different families. The four families ''Nitrobacteraceae'', ''Hyphomicrobiaceae'', '' Phyllobacteriaceae'', and ''Rhizobiaceae'' contain at least several genera of nitrogen-fixing, legume-nodulating, microsymbiotic bacteria. Examples are the genera ''Bradyrhizobium'' and ''Rhizobium''. Species of the ''Methylocystaceae'' are methanotrophs; they use methanol (CH3OH) or methane (CH4) as their sole energy and carbon sources. Other important genera are the human pathogens ''Bartonella'' and ''Brucella'', as well as ''Agrobacterium'' (useful in genetic engineering). Taxonomy Accepted families * ''Aestuariivirgaceae'' Li ''et al''. 2019 * '' Afifellaceae'' Hördt ''et al''. 2020 * '' Ahrensiaceae'' Hördt ''et al''. 2020 * ''Alsobacteraceae'' Sun ''et al''. 2018 * ''Amorphaceae'' Hördt ''et al''. 2020 * ''Ancalomicrobia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodopila Globiformis
''Rhodopila globiformis'' is a species of bacteria, formerly known as ''Rhodopseudomonas globiformis''. It is a motile, spherical organism. Cells can grow between 1.6 and 1.8 μm in diameter. The photopigments consist of bacteriochlorophyll aP and aliphatic methoxylated ketocarotenoids. The organism grows under anaerobic conditions in the light or under microaerophilic conditions in the dark. Biotin, p-aminobenzoic acid and a source of reduced sulfur are required as growth factors in order to cultivate this bacteria. This bacteria possesses a high potential cytochrome c The cytochrome complex, or cyt ''c'', is a small hemeprotein found loosely associated with the inner membrane of the mitochondrion. It belongs to the cytochrome c family of proteins and plays a major role in cell apoptosis. Cytochrome c is hig ...2. References Further reading * *Belova, Svetlana E.; Pankratov, Timofei A.; Detkova, Ekaterina N.; Kaparullina, Elena N.; Dedysh, Svetlana N. (July 20, 2009). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acetobacteraceae
Acetobacteraceae is a family of Gram-negative bacteria, belonging to the order Rhodospirillales, class Alphaproteobacteria. Two distinct clades are recognized. The acetic acid bacteria and a more heterogeneous group including acidophilic and phototrophic bacteria. The type genus is ''Acetobacter''. Ten genera from ''Acetobacteraceae'' make up the acetic acid bacteria. History ''Acetobacteraceae'' was originally proposed as a family for ''Acetobacter'' and ''Gluconobacter'' based on rRNA and DNA–DNA hybridization comparisons in 1980. Genera Accepted Genera The following genera have been effectively and validly published: * ''Acetobacter'' Beijerinck 1898 (Approved Lists 1980) * '' Acidibrevibacterium'' Muhadesi ''et al''. 2019 * ''Acidicaldus'' Johnson ''et al''. 2006 * ''Acidiphilium'' Harrison 1981 * ''Acidisoma'' Belova ''et al''. 2009 * ''Acidisphaera'' Hiraishi ''et al''. 2000 * ''Acidocella'' Kishimoto ''et al''. 1996 * ''Acidomonas'' Urakami ''et al''. 1989 * '' Ameyamae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodospirillales
The Rhodospirillales are an order of Pseudomonadota. Notable Families The ''Acetobacteraceae'' comprise the acetic acid bacteria, which are heterotrophic and produce acetic acid during their respiration.Garrity, George M.; Brenner, Don J.; Krieg, Noel R.; Staley, James T. (eds.) (2005). Bergey's Manual of Systematic Bacteriology, Volume Two: The Proteobacteria, Part C: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. New York, New York: Springer. . The '' Rhodospirillaceae'' include mainly purple nonsulfur bacteria, which produce energy through photosynthesis. Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature List of Prokaryotic names with Standing in Nomenclature (LPSN) is an online database that maintains information on the naming and taxonomy of prokaryotes, following the taxonomy requirements and rulings of the International Code of Nomenclature ... (LPSN). The phylogeny is based on whole-genome ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrobacter
''Nitrobacter'' is a genus comprising rod-shaped, gram-negative, and chemoautotrophic bacteria. The name ''Nitrobacter'' derives from the Latin neuter gender noun ''nitrum, nitri'', alkalis; the Ancient Greek noun βακτηρία'','' βακτηρίᾱς'','' rod. They are non-motile and reproduce via budding or binary fission. ''Nitrobacter'' cells are obligate aerobes and have a doubling time of about 13 hours. ''Nitrobacter'' play an important role in the nitrogen cycle by oxidizing nitrite into nitrate in soil and marine systems. Unlike plants, where electron transfer in photosynthesis provides the energy for carbon fixation, ''Nitrobacter'' uses energy from the oxidation of nitrite ions, NO2−, into nitrate ions, NO3−, to fulfill their energy needs. ''Nitrobacter'' fix carbon dioxide via the Calvin cycle for their carbon requirements. ''Nitrobacter'' belongs to the Alphaproteobacteria class of the Pseudomonadota. Morphology and characteristics ''Nitrobacter'' are gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhizobium
''Rhizobium'' is a genus of Gram-negative soil bacteria that fix nitrogen. ''Rhizobium'' species form an endosymbiotic nitrogen-fixing association with roots of (primarily) legumes and other flowering plants. The bacteria colonize plant cells within root nodules, where they convert atmospheric nitrogen into ammonia using the enzyme nitrogenase and then provide organic nitrogenous compounds such as glutamine or ureides to the plant. The plant, in turn, provides the bacteria with organic compounds made by photosynthesis. This mutually beneficial relationship is true of all of the rhizobia, of which the genus ''Rhizobium'' is a typical example. ''Rhizobium'' is also capable to solubilize phosphorus. History Martinus Beijerinck was the first to isolate and cultivate a microorganism from the nodules of legumes in 1888. He named it ''Bacillus radicicola'', which is now placed in ''Bergey's Manual of Determinative Bacteriology'' under the genus ''Rhizobium''. Research ''Rhizobium'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodomicrobium
''Rhodomicrobium'' is a microaerobic to anaerobic, purple non-sulfur, cluster-building genus of bacteria. ''Rhodomicrobium'' uses bacteriochlorophyll a and bacteriochlorophyll b for photosynthesis Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities. Some of this chemical energy is stored i ... and occurs in fresh- and sea-water and in soil References Further reading * * * * Hyphomicrobiales Bacteria genera {{Hyphomicrobiales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
