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Key People:Carl Woese...(Show more)Related Topics:IgnicoccusHalobacteriumThaumarchaeotaCrenarchaeotaEuryarchaeota...(Show more)
archaea, (domain Archaea), any of a group of single-celled prokaryotic organisms (that is, organisms who cells absence a characterized nucleus) that have distinctive molecular features separating them from bacteria (the other, much more prominent group of prokaryotes) as well as from standard scale (organisms, consisting of plants and also animals, whose cell contain a characterized nucleus). Archaea is obtained from the Greek word archaios, definition “ancient” or “primitive,” and indeed some archaea exhibit features worthy of the name. Members of the archaea include: Pyrolobus fumarii, which holds the top temperature limit for life in ~ 113 °C (235 °F) and was found living in hydrothermal vents; species of Picrophilus, which to be isolated from acidic soils in Japan and are the many acid-tolerant organisms known—capable of expansion at roughly pH 0; and the methanogens, which create methane gas as a metabolic by-product and also are discovered in anaerobic environments, such together in marshes, warm springs, and the organs of animals, including humans.
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In some equipment for classifying every one of life, the archaea constitute one of three an excellent domains of life creatures. In 1977 American microbiologist Carl Woese, on the communication of analyses of ribosom RNA, proposed that the prokaryotes, long taken into consideration to it is in a single group of organisms (essentially, the bacteria), in reality consist the two separate lineages. Woese called these two lineages the eubacteria and also the archaebacteria. This names to be subsequently readjusted to bacteria and archaea (the archaea being distinctly various from bacteria), however Woese’s splitting of the prokaryotes right into two teams has remained, and all life organisms are now considered by countless biologists to autumn into one of three great domains: Archaea, Bacteria, and also Eukarya. Further molecular evaluation has displayed that domain Archaea consists of two major subdivisions, the Crenarchaeota and the Euryarchaeota, and also one minor ancient lineage, the Korarchaeota. Other subdivisions have been proposed, including Nanoarchaeota and Thaumarchaeota.