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 group of single-celled prokaryotes organisms (that is, organisms whose cells absence a characterized nucleus) the have distinctive molecular attributes separating them native bacteria (the other, an ext prominent team of prokaryotes) and also from eukaryotes (organisms, consisting of plants and animals, whose cell contain a characterized nucleus). Archaea is obtained from the Greek indigenous archaios, definition “ancient” or “primitive,” and also indeed part archaea exhibit features worthy of that name. Members that the archaea include: Pyrolobus fumarii, which holds the upper temperature border for life in ~ 113 °C (235 °F) and was discovered living in hydrothermal vents; species of Picrophilus, which to be isolated indigenous acidic soils in Japan and are the many acid-tolerant organisms known—capable of expansion at approximately pH 0; and the methanogens, which create 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 systems for classifying every one of life, the archaea constitute one of three an excellent domains of living creatures. In 1977 American microbiologist Carl Woese, top top the communication of analyses of ribosome RNA, proposed that the prokaryotes, long considered to it is in a single group of biology (essentially, the bacteria), actually consist that two different lineages. Woese called these two lineages the eubacteria and also the archaebacteria. These names were subsequently changed to bacteria and archaea (the archaea being distinctly various from bacteria), however Woese’s dividing of the prokaryotes right into two groups has remained, and also all living organisms room now considered by numerous biologists to fall into one of three great domains: Archaea, Bacteria, and Eukarya. More molecular evaluation has presented that domain Archaea consists of two significant subdivisions, the Crenarchaeota and also the Euryarchaeota, and also one minor old lineage, the Korarchaeota. Various other subdivisions have been proposed, consisting of Nanoarchaeota and Thaumarchaeota.