Manaia, Célia M.Vaz-Moreira, IvoneNunes, Olga C.2022-09-062022-09-062019-12-169781118960608http://hdl.handle.net/10400.14/38726Hy.dro.ge.ni'phi.lus. Gr. neut. n. hydor water; Gr. v. genein to produce; N.L. neut. n. hydrogenum hydrogen (that which produces water); Gr. masc. adj. philos loving, friendly to; N.L. masc. n. Hydrogenophilus hydrogen lover.Proteobacteria / Betaproteobacteria / Hydrogenophilales / Hydrogenophilaceae / Hydrogenophilus Straight rods, 0.4–0.8 × 1.0–3.0 µm during exponential growth. Occur singly or in pairs (in Hydrogenophilus islandicus and Hydrogenophilus thermoluteolus). Motile or nonmotile. Gram‐negative. Nonsporulating. Aerobic or microaerobic, having a strictly respiratory type of metabolism, with oxygen or nitrate as the terminal electron acceptor. Colonies are yellow or grayish. Thermophilic; two species grow optimally at 50–55°C, and another at 63°C. Facultatively chemolithoautotrophic; can use H2 as an electron donor and CO2 as a carbon source. CO2 is fixed via the Calvin–Benson cycle. Acetate, pyruvate, dl‐lactate, and dl‐malate can be used as electron donors and carbon sources. Ammonium can be used as a nitrogen source. The major quinone system is ubiquinone 8. Isolated from hot springs and surrounding soil.DNA G + C content (mol%): 61–65. Type species: Hydrogenophilus thermoluteolus Hayashi, Ishida, Yokota, Kodama and Igarashi 1999, 785VP.engHydrogenophilusHydrogenophilus thermoluteolusHydrogenophilus hirschiiHydrogenophilus islandicusFacultative chemolithoautotrophsThermophilesbook part10.1002/9781118960608.gbm00968.pub2