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The Hydrogenophilaceae are a family of Betaproteobacteria, with two genera. Like all Proteobacteria they are Gram-negative. ''Hydrogenophilus'' are thermophilic, growing around 50 °C and obtaining their energy from oxidizing hydrogen. It includes the genera ''Hydrogenophilus'' and ''Thiobacillus'' (see below for the removal of certain species). ''Thiobacillus'' spp. can be used in pest control, such as potato scabs. If an affected area is treated with sulfur and ''Thiobacillus'' spp., the bacteria will oxidise the sulfur to sulfuric acid, which will destroy the pest, as the potato scabs cannot tolerate acidic conditions. ''Thiobacillus thioparus'' may contribute to the formation of acid rain through the oxidation of sulfur dioxide to sulfurous acid. ''Hydrogenophilus thermoluteolus'' is a facultative chemolithoautotroph that previously had only been found in hot springs. However, it was isolated in 2004 from ice core samples retrieved from a depth of ~3 km under the ice layer covering Lake Vostok in Antarctica. The presence of this thermophilic bacteria in the ice suggests that a geothermal system exists beneath the cold water body of Lake Vostok. ==Obsolete ''Thiobacillus'' species== The genus ''Thiobacillus'', was redefined to include only those species included among the Betaproteobacteria. Other member organisms once named "''Thiobacillus''" were transferred to Gammaproteobacteria:〔Kelly, D.P., and Wood A.P. (''Reclassification of some species of ''Thiobacillus'' to the newly designated genera ''Acidithiobacillus'' gen. nov., ''Halothiobacillus'' gen. nov. and ''Thermithiobacillus'' gen. nov.'' ) Int. J. Syst. Evol. Microbiol. (2000) 50:511-516. (PDF ).〕 *"''Thiobacillus thiooxidans''" was moved to ''Acidithiobacillus'' *"''Thiobacillus neapolitanus''" was moved to ''Halothiobacillus'' *"''Thiobacillus tepidarius''" was moved to ''Thermithiobacillus'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrogenophilaceae」の詳細全文を読む スポンサード リンク
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