The fixed form of nitrogen (ammonium ion and ammonia)can be oxidized for energy by

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Nitrifiers are the organisms that can oxidize the fixed form of nitrogen (ammonium ion and ammonia) for energy. They are chemolithotrophs, which means they obtain energy from inorganic compounds. Nitrification is the process by which ammonium ion is first oxidized to nitrite and then to nitrate by nitrifying bacteria. This process releases energy that is used by the bacteria for growth and reproduction.

The Fixed Form of Nitrogen (Ammonium Ion and Ammonia)can Be