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Key People:Carl Woese...(Show more)Related Topics:IgnicoccusPicrophilusHalobacteriumPyrodictiumNanoarchaeota...(Show more)

archaea, (domain Archaea), any of a group of single-celled prokaryotes organisms (that is, organisms who cells absence a defined nucleus) the have distinctive molecular qualities separating them indigenous bacteria (the other, an ext prominent group of prokaryotes) as well as from standard scale (organisms, including plants and animals, whose cell contain a defined nucleus). Archaea is acquired from the Greek word archaios, definition “ancient” or “primitive,” and indeed part archaea exhibit features worthy of the name. Members that the archaea include: Pyrolobus fumarii, which holds the upper temperature limit for life at 113 °C (235 °F) and was discovered living in hydrothermal vents; types of Picrophilus, which were isolated native acidic soils in Japan and are the many acid-tolerant organisms known—capable of growth at roughly pH 0; and also the methanogens, which develop methane gas as a metabolic by-product and also are uncovered in anaerobic environments, such together in marshes, hot springs, and the organs of animals, consisting of humans.

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In some equipment for classifying every one of life, the archaea constitute one of three great domains of living creatures. In 1977 American microbiologist Carl Woese, on the communication of analyses of ribosomal RNA, proposed the the prokaryotes, long considered to be a single group of organisms (essentially, the bacteria), in reality consist that two different lineages. Woese dubbed these 2 lineages the eubacteria and the archaebacteria. This names to be subsequently changed to bacteria and archaea (the archaea gift distinctly various from bacteria), yet Woese’s dividing of the prokaryotes right into two teams has remained, and also all life organisms space now thought about by countless biologists to fall into one of three an excellent domains: Archaea, Bacteria, and also Eukarya. Additional molecular evaluation has shown that domain Archaea is composed of two significant subdivisions, the Crenarchaeota and the Euryarchaeota, and one minor ancient lineage, the Korarchaeota. Other subdivisions have actually been proposed, including Nanoarchaeota and Thaumarchaeota.