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Psychrophiles or cryophiles are extremophilic organisms that are capable of growth and reproduction in low temperatures, ranging from −20 °C to +10 °C. They are found in places that are permanently cold, such as the polar regions and the deep sea. They can be contrasted with thermophiles, which are organisms that thrive at unusually high temperatures, and mesophiles at intermediate temperatures. Psychrophile is Greek for 'cold-loving', from ψυχρός.
Halorubrum is a genus in the family Halobacteriaceae. Halorubrum species can be found in the Dead Sea, Lake Zabuye and other waters with high salt concentration.
Shewanella frigidimarina is a species of bacteria, notable for being an Antarctic species with the ability to produce eicosapentaenoic acid. It grows anaerobically by dissimilatory Fe (III) reduction. Its cells are motile and rod shaped. ACAM 591 is its type strain.
Methanogenium frigidum is a psychrophilic, H2-using methanogen from Ace Lake, Antarctica.
Psychroflexus torquis is a species of bacterium. It is psychrophilic and its type strain is strain ACAM 623T. It has the ability to synthesize the polyunsaturated fatty acids eicosapentaenoic acid and arachidonic acid.
Desulfofrigus fragile is a bacterium. It is a psychrophilic Gram-negative and sulfate-reducing bacteria with type strain Lsv21T.
Methylosphaera hansonii, also called Antarctic budding methanotroph AM6, is a species of psychrophilic, group I methanotrophs, named after microbiologist Richard S. Hanson. It is non-motile, coccoidal in morphology, does not form resting cells, reproduces by constriction, and requires seawater for growth. Its type strain is ACAM 549.
Alcanivorax pacificus is a pyrene-degrading marine gammaprotobacterium. It is of the genus Alcanivorax, a group of marine bacteria known for degrading hydrocarbons. When originally proposed, the genus Alcanivorax comprised six distinguishable species. However, A. pacificus, a seventh strain, was isolated from deep sea sediments in the West Pacific Ocean by Shanghai Majorbio Bio-pharm Technology Co., Ltd. in 2011. A. pacificus’s ability to degrade hydrocarbons can be employed for cleaning up oil-contaminated oceans through bioremediation. The genomic differences present in this strain of Alcanivorax that distinguish it from the original consortium are important to understand to better utilize this bacteria for bioremediation.
Psychroserpens burtonensis is a species of psychrophilic, yellow-pigmented bacteria. It is non-motile and nutritionally fastidious. Its type strain is ACAM 188.
Gelidibacter algens is a species of psychrophilic, yellow-pigmented bacteria. It is saccharolytic, exhibits rapid gliding motility, and its cells are rod-like to filamentous. Its type strain is ACAM 536.
Psychrobacter is a genus of Gram-negative, osmotolerant, oxidase-positive, psychrophilic or psychrotolerant, aerobic bacteria which belong to the family Moraxellaceae and the class Gammaproteobacteria. The shape is typically cocci or coccobacilli. Some of those bacteria were isolated from humans and can cause humans infections such as endocarditis and peritonitis. This genus of bacteria is able to grow at temperatures between −10 and 42 °C. Rudi Rossau found through DNA-rRNA hybridization analysis that Psychrobacter belongs to the Moraxellaceae. The first species was described by Juni and Heym. Psychrobacter occur in wide range of moist, cold saline habitats, but they also occur in warm and slightly saline habitats.
Glaciecola pallidula is a psychrophilic bacteria found in Antarctic sea-ice habitats, being the type species of its genus. It is pigmented, psychrophilic, and a strictly aerobic chemoheterotroph. Its type strain is.
Glaciecola nitratireducens is a psychrophilic bacteria. It is Gram-negative, aerobic, rod-shaped, motile and halophilic. Its type strain is FR1064(T). Its genome has been sequenced.
Colwellia demingiae is a psychrophilic Antarctic bacterial species with the ability to synthesize docosahexaenoic acid. It is nonpigmented, curved-rod-like in shape, exhibiting facultative anaerobic growth, and possessing an absolute requirement for sea water. Its type strain is ACAM 459T. This bacteria is named after Jody Deming, a professor and researcher at University of Washington and her research mentor, Rita Colwell.
Colwellia hornerae is a psychrophilic Antarctic bacterial species with the ability to synthesize docosahexaenoic acid. It is nonpigmented, curved-rod-like in shape, exhibiting facultative anaerobic growth and possessing an absolute requirement for sea water. Its type strain is ACAM 607T.
Colwellia rossensis is a psychrophilic Antarctic bacterial species with the ability to synthesize docosahexaenoic acid. It is non-pigmented, curved rod-like shaped, exhibiting facultative anaerobic growth and possessing an absolute requirement for sea water. Its type strain is ACAM 608T.
Colwellia psychrotropica is a psychrophilic Antarctic bacterial species with the ability to synthesize docosahexaenoic acid. It is nonpigmented, curved-rod-like in shape, exhibiting facultative anaerobic growth and possessing an absolute requirement for sea water. Its type strain is ACAM 179T.
Pseudopedobacter saltans is a species of heparinase-producing bacteria. Pedobacter saltans was reclassified to Pseudopedobacter saltans.
Jody W. Deming is an American oceanographer. She is a professor of Oceanography and a marine microbiologist at the University of Washington (UW). Her research interests include studies of cold adapted microbes in their relation to astrobiology, biotechnology, and bioremediation. She is known for her extensive field work, being involved in over 50 nautical research expeditions. Deming is also the cofounder of the UW Astrobiology Extremophile Laboratory.
Cytophagales is an order of non-spore forming, rod-shaped, Gram-negative bacteria that move through a gliding or flexing motion. These chemoorganotrophs are important remineralizers of organic materials into micronutrients. They are widely dispersed in the environment, found in ecosystems including soil, freshwater, seawater and sea ice. Cytophagales is included in the Bacteroidetes phylum.
References
- ↑ Bowman, J. P.; McCAMMON, S. A.; Brown, J. L.; McMEEKIN, T. A. (1998). "Glaciecola punicea gen. nov., sp. nov. and Glaciecola pallidula gen. nov., sp. nov.: psychrophilic bacteria from Antarctic sea-ice habitats". International Journal of Systematic Bacteriology. 48 (4): 1213–1222. doi: 10.1099/00207713-48-4-1213 . ISSN 0020-7713.
- ↑ Qin, Q.-L.; Xie, B.-B.; Shu, Y.-L.; Rong, J.-C.; Zhao, D.-L.; Zhang, X.-Y.; Chen, X.-L.; Zhou, B.-C.; Zhang, Y.-Z. (2012). "Genome Sequence of Proteorhodopsin-Containing Sea Ice Bacterium Glaciecola punicea ACAM 611T". Journal of Bacteriology. 194 (12): 3267. doi:10.1128/JB.00463-12. ISSN 0021-9193. PMC 3370857 . PMID 22628500.