''Janibacter hoylei'' 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. Gram-positive bact ...

, aerobic,

bacterium Bacteria (; singular: 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 species was initially isolated from cryovials that sampled high altitude air between 20 and 41 km above sea level. The species was first described in 2009, and the species is named after English astronomer Fred Hoyle. Two other new species were discovered during the same survey: ''

Bacillus isronensis ''Solibacillus isronensis'' is a bacterium from the genus of ''Solibacillus'' which has been isolated from a cryogenic tube from India. It is named after ISRO The Indian Space Research Organisation (ISRO; ) is the national space agency of In ...

'' and '' Bacillus aryabhattai''. The optimum growth temperature for ''J. hoylei'' is 25-30 °C, and can grow in the 20-40 °C range. The optimum pH is 9.0, and can grow at 5.0-10.0. The species is more resistant to UV radiation than other members of ''Janibacter''.

References

Intrasporangiaceae Bacteria described in 2009 {{Actinobacteria-stub