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Hymenobacter Algoricola
Hymenobacter algoricola is a species of bacteria first isolated from Victoria Upper Glacier, Antarctica on basal ice. It is a psychrotolerant, heterotrophic aerobe. It is notable for the prevalence of horizontal gene transfers in its evolution Evolution is the change in the heritable Phenotypic trait, characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, re ..., possibly due to dormancy because of its habitat. References Further reading *Reddy, Gundlapally SN, and Ferran Garcia-Pichel. "Description of Hymenobacter arizonensis sp. nov. from the southwestern arid lands of the United States of America." Antonie van Leeuwenhoek 103.2 (2013): 321–330. *magna Bryantseva, Ectothiorhodospira. "List of new names and new combinations previously effectively, but not validly, published." Strain 8: 7. *Lee, Jae-Jin, et al. "Hymenobacter swuensis sp. nov., a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria Upper Glacier
Victoria Valley () is an extensive ice-free valley, formerly occupied by a large glacier, extending from Victoria Upper Glacier to Victoria Lower Glacier in Victoria Land, Antarctica. It is one of the larger McMurdo Dry Valleys. Name Victoria Valley was named by the Victoria University of Wellington Antarctic Expedition (VUWAE: 1958-59) after their Alma Mater Victoria University of Wellington which sponsored the expedition. Location The Victoria Valley is one of the McMurdo Dry Valleys. The head of the Victoria Valley, which contains the Victoria Upper Glacier, is south of the Clare Range. The valley descends south-southeast between Saint Johns Range to the east and the Cruzen Range to the west. It is joined from the west by the Barwick Valley, and then south of Mount Insel by the McKelvey Valley, below which Lake Vida lies across the valley. The valley continues in an east-northeast direction. The Packard Glacier descends part way into it from the north and the Clark Glacie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of . Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of . Antarctica is, on average, the coldest, driest, and windiest of the continents, and it has the highest average elevation. It is mainly a polar desert, with annual Climate of Antarctica#Precipitation, precipitation of over along the coast and far less inland. About 70% of the world's freshwater reserves are frozen in Antarctica, which, if melted, would raise global sea levels by almost . Antarctica holds the record for the Lowest temperature recorded on Earth, lowest measured temperature on Earth, . The coastal regions can reach temperatures over in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psychrotolerant
Psychrophiles or cryophiles (adj. ''psychrophilic'' or ''cryophilic'') are extremophilic organisms that are capable of growth and reproduction in low temperatures, ranging from to . 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', . Many such organisms are bacteria or archaea, but some eukaryotes such as lichens, snow algae, phytoplankton, fungi, and wingless midges, are also classified as psychrophiles. Biology Habitat The cold environments that psychrophiles inhabit are ubiquitous on Earth, as a large fraction of the planetary surface experiences temperatures lower than 10 °C. They are present in permafrost, polar ice, glaciers, snowfields and deep ocean waters. These organisms can also be found in pockets of sea ice with high salin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterotrophic
A heterotroph (; ) is an organism that cannot produce its own food, instead taking nutrition from other sources of organic carbon, mainly plant or animal matter. In the food chain, heterotrophs are primary, secondary and tertiary consumers, but not producers. Living organisms that are heterotrophic include all animals and fungi, some bacteria and protists, and many parasitic plants. The term heterotroph arose in microbiology in 1946 as part of a classification of microorganisms based on their type of nutrition. The term is now used in many fields, such as ecology, in describing the food chain. Heterotrophs occupy the second and third trophic levels of the food chain while autotrophs occupy the first trophic level. Heterotrophs may be subdivided according to their energy source. If the heterotroph uses chemical energy, it is a chemoheterotroph (e.g., humans and mushrooms). If it uses light for energy, then it is a photoheterotroph (e.g., green non-sulfur bacteria). Heterotrop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cellular Respiration
Cellular respiration is the process of oxidizing biological fuels using an inorganic electron acceptor, such as oxygen, to drive production of adenosine triphosphate (ATP), which stores chemical energy in a biologically accessible form. Cellular respiration may be described as a set of metabolic reactions and processes that take place in the cells of organisms to transfer chemical energy from nutrients to ATP, with the flow of electrons to an electron acceptor, and then release waste products. If the electron acceptor is oxygen, the process is more specifically known as aerobic cellular respiration. If the electron acceptor is a molecule other than oxygen, this is anaerobic cellular respiration. Fermentation, which is also an anaerobic process, is not respiration, as no external electron acceptor is involved. The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, producing large amounts of energy (ATP). Respiration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horizontal Gene Transfer
Horizontal gene transfer (HGT) or lateral gene transfer (LGT) is the movement of genetic material between organisms other than by the ("vertical") transmission of DNA from parent to offspring (reproduction). HGT is an important factor in the evolution of many organisms. HGT is influencing scientific understanding of higher-order evolution while more significantly shifting perspectives on bacterial evolution. Horizontal gene transfer is the primary mechanism for the spread of antibiotic resistance in bacteria, and plays an important role in the evolution of bacteria that can degrade novel compounds such as human-created Bactericide, pesticides and in the evolution, maintenance, and transmission of virulence. It often involves Temperateness (virology), temperate bacteriophages and plasmids. Genes responsible for antibiotic resistance in one species of bacteria can be transferred to another species of bacteria through various mechanisms of HGT such as Transformation (genetics), tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolution
Evolution is the change in the heritable Phenotypic trait, characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. The process of evolution has given rise to biodiversity at every level of biological organisation. The scientific theory of evolution by natural selection was conceived independently by two British naturalists, Charles Darwin and Alfred Russel Wallace, in the mid-19th century as an explanation for why organisms are adapted to their physical and biological environments. The theory was first set out in detail in Darwin's book ''On the Origin of Species''. Evolution by natural selection is established by observable facts about living organisms: (1) more offspring are often produced than can possibly survive; (2) phenotypic variatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenobacter
''Hymenobacter'' is a Gram-negative Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteristic is that their cell envelope consists ... and non-motile bacterial genus from the family Hymenobacteraceae. Species ''Hymenobacter'' comprises the following species: '' H. actinosclerus'' '' H. aerophilus'' '' H. algoricola'' '' H. antarcticus'' '' H. aquaticus'' '' H. aquatilis'' '' H. arcticus'' '' H. arizonensis'' '' H. artigasi'' '' H. cavernae'' '' H. chitinivorans'' '' H. coalescens'' '' H. coccineus'' '' H. daecheongensis'' '' H. daeguensis'' '' H. defluvii'' '' H. deserti'' '' H. elongatus'' '' H. fastidiosus'' '' H. flocculans'' '' H. frigidus'' '' H. gelipurpurascens'' '' H. ginsengisoli'' '' H. glacialis'' '' H. glaciei'' '' H. glacieicola'' '' H. gummosus'' '' H. kanuolensis'' '' H. koreensis'' '' H. lapidarius'' '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
