The Nitrification reference article from the English Wikipedia on 24-Jul-2004
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Nitrification

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Nitrification is the oxidation of ammonia into nitrites followed with the oxidation of these nitrites into nitrates. Nitrification is an important step in the nitrogen cycle.

The oxidation of ammonia into nitrites is done by bacteria of the genus Nitrosomonas. The second step (oxidation of nitrites into nitrates) is done by bacteria of the genus Nitrobacter.

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