Alicyclobacillus tolerans

Alicyclobacillus tolerans is a species of Gram positive, strictly aerobic, bacterium. The bacteria are acidophilic and produced endospores. It was first isolated from oxidizable lead–zinc ores in Uzbekistan. 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".
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.