“…In addition, a limited number of bacteria can reduce nitrate to elemental nitrogen by a series of anaerobic respiratory processes that, in sum, are called denitrification. In several studies, nitrite, nitric oxide, and nitrous oxide have been identified as intermediate products (12,166,224,225), although nitrous oxide rather than nitrogen is the terminal product of denitrification in a few bacterial species and strains (110,124,285).…”