''Alicyclobacillus macrosporangiidus'' 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 produce endospores. It was first isolated from soil in a crop field in Fujieda,

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

. The species was first described in 2007, and the name is derived from the

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

''macros'' (big) and ''sporangium'' (sporangia), referring to the large spores produced by the organism. The optimum growth temperature for ''A. macrosporangiidus'' is 50-55 °C, and can grow in the 35-60 °C range. The optimum pH is 4.0-4.5, and cannot grow at pH 3.0 or pH 6.5. ''A. macrosporangiidus'' was found during a Japanese survey of various beverages and environments, which also discovered 5 other species of ''Alicyclobacillus'': '' A. contaminans'', '' A. fastidiosus'', '' A. kakegawensis'', '' A. sacchari'', and '' A. shizuokensis''.

References

Gram-positive bacteria Bacteria described in 2007 Bacillales {{bacilli-stub