Archaea

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Archaea

Evolutionary biology
One of the three domains of living organisms: Archaea, Bacteria and Eukaryota. While Archaea are single-celled, they are unlike bacteria given their independent evolutionary history. Archaea differ from Eukaryota in their ribosomal structure and the presence—in some—of introns in the genome, as well as other features (e.g., different membrane composition).
 
Molecular biology
Archaea are of interest in biotechnology as they have unique biochemical features (e.g., enzymes of theromophiles, such as Taq polymerase, the “workhorse” enzyme of PCR) and are extremely stable at high temperatures. Archaea include metabolic oddities (e.g., extreme halophiles, which live in extremely salty environments), methanogens (which produce methane) and sulphur-dependant extreme thermophiles (which can live in extremely hot environments).

Archaea phyla
• Crenarchaeota
• Euryarchaeota
• Korarchaeota
• Nanoarchaeota
• Thaumarchaeota (recently proposed)

Archaea

( formerly
References in periodicals archive ?
The archaeal amoA gene copy numbers varied from 1.45 x [10.sup.6] to 5.28 x [10.sup.8] per gram of dry soil in studied soils at the beginning of incubation, being highest in the P soil and lowest in the F soil.
Shiratori et al., "Seasonal transition of active bacterial and archaeal communities in relation to water management in paddy soils," Microbes and Environments, vol.
In this study, with a marine picoplankton assemblage collected at eastern North Pacific, a 38.5 kbp fragment containing an archaeal 16S rRNA gene was isolated for the first time.
PCR Amplification, Clone Library Construction, and Phylogenetic Analysis of Archaeal 16S rRNA Genes.
Bacterial and Archaeal diversity in high altitude wetlands of the Chilean Altiplano.
Omnipotent role of archaeal elongation factor 1 alpha (EF1a in translational elongation and termination and quality control of protein synthesis.
On the other hand, if components with an origin in archaeal, bacterial, or viral membranes are chosen, they could enhance the immunogenicity of the formulation [35, 37, 46-50].
Archaeal communities representing 0.5% of the total detected bacteria were dominated by classes of methanogens Methanomicrobia and Methanobacteria (Figure 1(c)).