3 articles
Ammonia-oxidizing archaea
Ammonia-oxidizing archaea (AOA) are Thaumarchaeota microbes that obtain energy by oxidizing ammonia to nitrite, dominating nitrification in oceans, soils, and sediments and producing most marine nitrous oxide.
Nitrosopumilus
Nitrosopumilus is a genus of marine ammonia-oxidizing archaea (Thaumarchaeota, Nitrosopumilaceae); its type species N. maritimus SCM1, first AOA isolated (2005), oxidizes ammonia to nitrite with Km ≈ 133 nM and fixes CO2.
Thaumarchaeota and archaeal ammonia oxidation
Thaumarchaeota (Nitrososphaerota) are an archaeal phylum proposed in 2008 whose ammonia-oxidizing archaea dominate nitrification in oceans and soils, with nanomolar ammonia affinity, copper-based metabolism, and the signature lipid crenarchaeol.