Alternate titles: Archaea, archaean, archaebacteria, archaebacterium, archaeobacteria, archaeobacterium, archaeon
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Key People:Carl Woese...(Show more)Related Topics:IgnicoccusEuryarchaeotaThaumarchaeotaPyrodictiumPicrophilus...(Show more)

archaea, (domain Archaea), any kind of of a team of single-celled prokaryotes organisms (that is, organisms whose cells absence a defined nucleus) that have distinctive molecular characteristics separating them native bacteria (the other, an ext prominent team of prokaryotes) and from eukaryotes (organisms, including plants and animals, whose cells contain a characterized nucleus). Archaea is obtained from the Greek indigenous archaios, definition “ancient” or “primitive,” and also indeed part archaea exhibit attributes worthy of the name. Members of the archaea include: Pyrolobus fumarii, i beg your pardon holds the top temperature limit for life at 113 °C (235 °F) and was uncovered living in hydrothermal vents; varieties of Picrophilus, which were isolated native acidic soils in Japan and are the most 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 are discovered in anaerobic environments, such together in marshes, warm springs, and also the offal of animals, consisting of humans.

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In some solution for classifying every one of life, the archaea constitute one of three an excellent domains of life creatures. In 1977 American microbiologist Carl Woese, ~ above the communication of analyses of ribosome RNA, proposed the the prokaryotes, long taken into consideration to be a solitary group of biology (essentially, the bacteria), in reality consist of two different lineages. Woese referred to as these two lineages the eubacteria and also the archaebacteria. These names to be subsequently changed to bacteria and archaea (the archaea being distinctly different from bacteria), but Woese’s separating of the prokaryotes right into two teams has remained, and also all living organisms are now thought about by many biologists to fall into among three good domains: Archaea, Bacteria, and also Eukarya. Further molecular analysis has displayed that domain Archaea consists of two significant subdivisions, the Crenarchaeota and the Euryarchaeota, and also one minor old lineage, the Korarchaeota. Various other subdivisions have actually been proposed, including Nanoarchaeota and also Thaumarchaeota.