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Nature 442, 806-809 (17 August 2006) | doi:10.1038/nature04983;

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Archaea predominate among ammonia-oxidizing prokaryotes in soils

Ammonia oxidation is the first step in nitrification, a key process in the global nitrogen cycle that results in the formation of nitrate through microbial activity. The increase in nitrate availability in soils is important for plant nutrition, but it also has considerable impact on groundwater pollution owing to leaching.

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