Taxonomic Unit

Microorganism Name

Enzyme

Substrate

Product

Nitrifying Bacteria

Nitrifs 1

Ammonia monooxygenase

Ammonia NH₃

Hydroxylamine NH₂OH

Nitrifying Bacteria

Nitrifs 2

Hydroxylamine oxidoreductase

Hydroxylamine

Nitrite NO₂

Nitrifying Bacteria

Nitrifs 3

Nitrite oxidoreductase

Nitrite

Nitrate NO₃