• eukaryotes and archaea
  • The researchers who discovered this, Woese and his colleagues, proposed the addition of the "domain" as a taxonomic level above that of kingdom, with all life classified within one of three domains, now called Bacteria, Eukaryotes, and Archaea. (eol.org)
  • However, results obtained during recent years have revealed that this belief is far from being true and that-in contrast-N-terminal protein acetylation adds to the ever growing number of biological functions that combine eukaryotes and archaea to the exclusion of the bacteria. (hindawi.com)
  • A prominent difference is that bacteria have an initiator tRNA (transfer RNA) that has a modified methionine , whereas eukaryotes and archaea have an initiator tRNA with an unmodified methionine. (britannica.com)
  • organisms
  • 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. (wikipedia.org)
  • The word archaea comes from the Ancient Greek ἀρχαῖα, meaning "ancient things", as the first representatives of the domain Archaea were methanogens and it was assumed that their metabolism reflected Earth's primitive atmosphere and the organisms' antiquity. (wikipedia.org)
  • Currently these archaea could not be cultivated in the laboratory, only the genomes of these organisms could be assembled from the metagenomic sequences. (uni-ulm.de)
  • Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya is a paper published in 1990 in the Proceedings of the National Academy of Sciences of the United States of America. (wikipedia.org)
  • Archaea is a domain of organisms that are prokaryotic, single-celled, and are thought to have developed 4 billion years ago. (wikipedia.org)
  • Proteins
  • Anja Poehlein, Rolf Daniel, and Henning Seedorf, " The Draft Genome of the Non-Host-Associated Methanobrevibacter arboriphilus Strain DH1 Encodes a Large Repertoire of Adhesin-Like Proteins ," Archaea , vol. 2017, pp. 1-9, 2017. (hindawi.com)
  • temperatures
  • Methanogens are also used in biogas production and sewage treatment, and biotechnology exploits enzymes from extremophile archaea that can endure high temperatures and organic solvents. (wikipedia.org)
  • These results likely indicate that along with increasing GC pairing in the wobble position, thermophilic archaea have other mechanisms for stabilizing their DNA at such high temperatures. (wikipedia.org)
  • polymerase
  • This new appreciation of the importance and ubiquity of archaea came from using polymerase chain reaction (PCR) to detect prokaryotes from environmental samples (such as water or soil) by multiplying their ribosomal genes. (wikipedia.org)
  • genes
  • Despite this morphological 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. (wikipedia.org)
  • Archaea were first classified as a separate group of prokaryotes in 1977 by Carl Woese and George E. Fox in phylogenetic trees based on the sequences of ribosomal RNA (rRNA) genes. (wikipedia.org)
  • found
  • Classical photosynthesis using chlorophyll has not been found in any archaea. (britannica.com)
  • The S-layer, which is found in most Archaea, and in many bacteria, serves many crucial functions including protection from deleterious extracellular substances. (wikipedia.org)
  • initially
  • Initially people thought that archaea are 'freaks' living only at sites with extreme living conditions like f.i. hot geysers in Yellowstone National Park and Black Smokers at the bottom of the ocean. (uni-ulm.de)
  • PMID
  • Some archaea have a separate homocitrate synthase (AksA) which also synthesizes longer homocitrate analogs [ PMID: 9665716 ]. (ebi.ac.uk)
  • cell
  • Archaea are generally less than one micron long, may or may not have flagella, and cell-shapes include spherical, box-like, triangular, and slender filamentous forms ( UCMP , accessed 2011). (eol.org)
  • Various types of cell walls exist in the archaea. (britannica.com)
  • known
  • They can live under extreme conditions: there are archaea known to live in boiling water! (eol.org)
  • features
  • The Archeon Tarot features a mix of traditional and non-traditional imagery in dream-like digital collage, inspired by the author's personal symbolism and mythology. (aeclectic.net)
  • long time
  • For a long time, archaea were seen as extremophiles that only exist in extreme habitats such as hot springs and salt lakes. (wikipedia.org)