''Alicyclobacillus tolerans'' is a species of

Gram positive 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. The Gram stain i ...

, strictly aerobic,

bacterium Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the ...

. The bacteria are acidophilic and produced endospores. It was first isolated from oxidizable lead–zinc ores in

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. The strain was first identified in 1983, but was classified as ''Sulfobacillus thermosulfidooxidans'' subsp. ''thermotolerans'' strain K1. It was reclassified as ''Alicyclobacillus'' in 2005. The species name refers to the ability to tolerate changes in temperature and pH. ''A. tolerans'' was reclassified to ''Alicyclobacillus'' along with ''Sulfobacillus disulfidooxidans'', which was classified as ''

Alicyclobacillus disulfidooxidans ''Alicyclobacillus disulfidooxidans'' (formerly ''Sulfobacillus disulfidooxidansis'') a species of Gram positive, strictly aerobic, bacterium. The bacteria are acidophilic and produced endospores. It was first isolated from wastewater sludge in B ...

''. The optimum growth temperature for ''A. tolerans'' is 37-42 °C, and can grow in the 20-50 °C range. The optimum pH is 2.5-2.7, and can grow in pH 1.5-5.0.

References

Gram-positive bacteria Bacteria described in 2005 Bacillales {{bacilli-stub