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Ammonia-oxidising Crenarchaeota: important players in the nitrogen cycle?

机译:氨氧化Crenarchaeota:氮循环中的重要参与者?

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Cultivation-independent molecular surveys show that members of the kingdom Crenarchaeota within the domain Archaea represent a substantial component of microbial communities in aquatic and terrestrial environments. Recently, metagenomic studies have revealed that such Crenarchaeota contain and express genes related to those of bacterial ammonia monooxygenases. Furthermore, a marine chemolithoautotrophic strain was isolated that uses ammonia as a sole energy source. Considering the ubiquity and abundance of Crenarchaeota, these findings considerably challenge the accepted view of the microbial communities involved in global nitrogen cycling. However, the quantitative contribution of Archaea to nitrification in marine and terrestrial environments still remains to be elucidated.
机译:独立于耕种的分子调查表明,古细菌领域中的Crenarchaeota王国成员代表了水生和陆地环境中微生物群落的重要组成部分。近来,宏基因组学研究已经揭示了这种Crenarchaeota含有并表达与细菌氨单加氧酶相关的基因。此外,分离出使用氨作为唯一能源的海洋化学自养型菌株。考虑到Crenarchaeota的普遍存在和丰富性,这些发现极大地挑战了参与全球氮循环的微生物群落的公认观点。然而,古细菌对海洋和陆地环境中硝化作用的定量贡献仍有待阐明。

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