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- Archaea abstract "The Archaea (/ɑrˈkiːə/ or /ɑrˈkeɪə/; singular archaeon) are a domain or kingdom of single-celled microorganisms. These microbes are prokaryotes, meaning they have no cell nucleus or any other membrane-bound organelles in their cells.Archaea were initially classified as bacteria, receiving the name archaebacteria (in Kingdom Monera), but this classification is outdated. Archaeal cells have unique properties separating them from the other two domains of life: Bacteria and Eukaryota. The Archaea are further divided into four recognized phyla. Classification is difficult, because the majority have not been studied in the laboratory and have only been detected by analysis of their nucleic acids in samples from their environment.Archaea and bacteria are similar in size and shape, although a few archaea have very strange shapes, such as the flat and square-shaped cells of Haloquadratum walsbyi. Despite this visual similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably the enzymes involved in transcription and translation. Other aspects of archaeal biochemistry are unique, such as their reliance on ether lipids in their cell membranes. Archaea use more energy sources than eukaryotes: ranging from organic compounds such as sugars, to ammonia, metal ions or even hydrogen gas. Salt-tolerant archaea (the Haloarchaea) use sunlight as an energy source, and other species of archaea fix carbon; however, unlike plants and cyanobacteria, no species of archaea does both. Archaea reproduce asexually by binary fission, fragmentation, or budding; unlike bacteria and eukaryotes, no species form spores.Archaea were initially viewed as extremophiles living in harsh environments, such as hot springs and salt lakes, but they have since been found in a broad range of habitats, including soils, oceans, marshlands and the human colon and navel. Archaea are particularly numerous in the oceans, and the archaea in plankton may be one of the most abundant groups of organisms on the planet. Archaea are a major part of Earth's life and may play roles in both the carbon cycle and the nitrogen cycle. No clear examples of archaeal pathogens or parasites are known, but they are often mutualists or commensals. One example is the methanogens that inhabit the human gut and the ruminant gut, where their vast numbers aid digestion. Methanogens are used in biogas production and sewage treatment, and enzymes from extremophile archaea that can endure high temperatures and organic solvents are exploited in biotechnology.".
- Archaea thumbnail Halobacteria.jpg?width=300.
- Archaea wikiPageExternalLink archaea.ucsc.edu.
- Archaea wikiPageExternalLink 21_microbes.shtml.
- Archaea wikiPageExternalLink main.cgi?section=TaxonList&page=lineageMicrobes&domain=Archaea.
- Archaea wikiPageExternalLink tree_of_life.htm.
- Archaea wikiPageExternalLink archaea.html.
- Archaea wikiPageExternalLink ASM_news_69_2003_503.pdf.
- Archaea wikiPageExternalLink wwwtax.cgi?mode=Info&id=2157&lvl=3&lin=f&keep=1&srchmode=1&unlock.
- Archaea wikiPageExternalLink archaea.html.
- Archaea wikiPageID "19179592".
- Archaea wikiPageRevisionID "606495116".
- Archaea domain "Archaea".
- Archaea domainAuthority "Woese, Kandler & Wheelis, 1990".
- Archaea hasPhotoCollection Archaea.
- Archaea imageCaption "Halobacteria sp. strain NRC-1,".
- Archaea imageCaption "each cell about 5 μm long".
- Archaea imageWidth "200".
- Archaea name "Archaea".
- Archaea subdivision Crenarchaeota.
- Archaea subdivision "Euryarchaeota".
- Archaea subdivision "Korarchaeota".
- Archaea subdivision "Nanoarchaeota".
- Archaea subdivision "Thaumarchaeota".
- Archaea subdivisionRanks "Kingdoms and phyla".
- Archaea subject Category:Archaea.
- Archaea subject Category:Domains_(biology).
- Archaea subject Category:Extremophiles.
- Archaea type Archaea.
- Archaea type Species.
- Archaea type BiologicalLivingObject.
- Archaea type Organism.
- Archaea comment "The Archaea (/ɑrˈkiːə/ or /ɑrˈkeɪə/; singular archaeon) are a domain or kingdom of single-celled microorganisms. These microbes are prokaryotes, meaning they have no cell nucleus or any other membrane-bound organelles in their cells.Archaea were initially classified as bacteria, receiving the name archaebacteria (in Kingdom Monera), but this classification is outdated. Archaeal cells have unique properties separating them from the other two domains of life: Bacteria and Eukaryota.".
- Archaea label "Archaea".
- Archaea label "Archaea".
- Archaea label "Archaea".
- Archaea label "Archaea".
- Archaea label "Archaea".
- Archaea label "Archaea".
- Archaea label "Archaeen".
- Archaea label "Archeony".
- Archaea label "Археи".
- Archaea label "عتائق".
- Archaea label "古細菌".
- Archaea label "古菌".
- Archaea sameAs Archea.
- Archaea sameAs Archaeen.
- Archaea sameAs Αρχαία.
- Archaea sameAs Archaea.
- Archaea sameAs Arkeobakterio.
- Archaea sameAs Archaea.
- Archaea sameAs Arkea.
- Archaea sameAs Archaea.
- Archaea sameAs 古細菌.
- Archaea sameAs 고세균.
- Archaea sameAs Archaea.
- Archaea sameAs Archeony.
- Archaea sameAs Archaea.
- Archaea sameAs m.0n61.
- Archaea sameAs Q10872.
- Archaea sameAs Q10872.
- Archaea wasDerivedFrom Archaea?oldid=606495116.
- Archaea depiction Halobacteria.jpg.
- Archaea isPrimaryTopicOf Archaea.
- Archaea name "Archaea".