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Key People:Carl Woese...(Show more)Related Topics:IgnicoccusHalobacteriumThaumarchaeotaCrenarchaeotaEuryarchaeota...(Show more)
archaea, (domain Archaea), any kind of of a team of single-celled prokaryotic organisms (that is, organisms whose cells lack a characterized nucleus) that have distinctive molecular attributes separating them indigenous bacteria (the other, an ext prominent team of prokaryotes) and also from eukaryotes (organisms, including plants and animals, whose cells contain a identified nucleus). Archaea is obtained from the Greek word archaios, definition “ancient” or “primitive,” and also indeed part archaea exhibit attributes worthy of that name. Members that the archaea include: Pyrolobus fumarii, which holds the upper temperature limit for life in ~ 113 °C (235 °F) and was uncovered living in hydrothermal vents; types of Picrophilus, which were isolated native acidic soils in Japan and also 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 discovered in anaerobic environments, such as in marshes, hot springs, and also the guts of animals, consisting of humans.
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In some systems for classifying every one of life, the archaea constitute among three good domains of living creatures. In 1977 American microbiologist Carl Woese, ~ above the communication of analyses of ribosome RNA, proposed that the prokaryotes, long considered to it is in a solitary group of biology (essentially, the bacteria), in reality consist that two separate lineages. Woese referred to as these two lineages the eubacteria and the archaebacteria. These names were subsequently changed to bacteria and archaea (the archaea being distinctly various from bacteria), yet Woese’s separating of the prokaryotes right into two teams has remained, and all life organisms are now considered by many biologists to autumn into one of three good domains: Archaea, Bacteria, and also Eukarya. More molecular evaluation has shown that domain Archaea is composed of two major subdivisions, the Crenarchaeota and also the Euryarchaeota, and one minor old lineage, the Korarchaeota. Various other subdivisions have actually been proposed, including Nanoarchaeota and Thaumarchaeota.