''Tumebacillus permanentifrigorisis'' 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 cells are rod-shaped and form spores. It was first isolated from a 9-meter-deep

permafrost Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...

sample from the Canadian high Arctic. The species was first described in 2008, and the name refers to its original isolation from permafrost. ''T. permanentifrigoris'' was the first species in the new genus, ''Tumebacillus'', and is the type species for the genus. The isolate may have survived 5000–7000 years in ice before being discovered. The optimum growth temperature for ''T. permanentifrigoris'' is 25-30 °C, and can grow in the 5-37 °C range and in pH 5.5-8.9. The bacterium would not grow in liquid broth media, but formed yellow colonies on agar.

References

Bacteria described in 2008 Gram-positive bacteria Bacillales {{Bacilli-stub