Archaea in biogeochemical cycles.

  title={Archaea in biogeochemical cycles.},
  author={Pierre Offre and Anja Spang and Christa Schleper},
  journal={Annual review of microbiology},
Archaea constitute a considerable fraction of the microbial biomass on Earth. Like Bacteria they have evolved a variety of energy metabolisms using organic and/or inorganic electron donors and acceptors, and many of them are able to fix carbon from inorganic sources. Archaea thus play crucial roles in the Earth's global geochemical cycles and influence greenhouse gas emissions. Methanogenesis and anaerobic methane oxidation are important steps in the carbon cycle; both are performed exclusively… 

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