''Knoellia'' is a genus 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, non-

endospore An endospore is a dormant, tough, and non-reproductive structure produced by some bacteria in the phylum Bacillota. The name "endospore" is suggestive of a spore or seed-like form (''endo'' means 'within'), but it is not a true spore (i.e., no ...

forming bacteria. Species in this genus are

mesophilic A mesophile is an organism that grows best in moderate temperature, neither too hot nor too cold, with an optimum growth range from . The optimum growth temperature for these organisms is 37°C. The term is mainly applied to microorganisms. Organi ...

and have cells that are irregular rods or coccoid. The genus was first proposed in 2002. The

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...

''K. sinensis'' was first isolated from cave soil in

Guilin Guilin ( Standard Zhuang: ''Gveilinz''; alternatively romanized as Kweilin) is a prefecture-level city in the northeast of China's Guangxi Zhuang Autonomous Region. It is situated on the west bank of the Li River and borders Hunan to the nort ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. The genus is named after Hans Knöll, a German physician and microbiologist, and a "pioneer in antibiotic research. Other members of this genus have been initially isolated from soil, air, and pig manure. '' K. remsis'' was originally classified in the genus ''

Tetrasphaera ''Tetrasphaera '' is a bacterial genus from the family of Intrasporangiaceae Intrasporangiaceae is an actinomycete family. The family is named after the type genus '' Intrasporangium''. The type species of ''Intrasporangium'' ('' I. calvum'') ...

'', but was reclassified into ''Knoellia'' in 2018. Species from this genus produce white or cream-colored colonies on R2A agar, expect for '' K. flava'', which produces yellow colonies. All species are

; optimum growth is between 28 and 35 °C and pH 5.0-9.0. ''K. remsis'' is the only species capable of growth above 42 °C.

References

{{Taxonbar, from=Q21218819 Bacteria genera Intrasporangiaceae