21. How do the biogeochemical processes ( denitrification , for example ) that characterize this system work? 22. Many facultative anaerobes use denitrification because nitrate, like oxygen, has a high reduction potential. 23. Bacterioplankton play critical roles in global nitrogen fixation, nitrification, denitrification , remineralisation and methanogenesis. 24. A simple denitrification reaction proceeds as: 25. Aerobic denitrification tends to produce more nitrous oxide ( N 2 O ) than anaerobic denitrification. 26. Aerobic denitrification tends to produce more nitrous oxide ( N 2 O ) than anaerobic denitrification . 27. Any remaining ammonium in the environment can undergo nitrification and denitrification to yield nitrate and nitrite. 28. These processes lead to the ecologically important processes of denitrification , sulfate reduction and acetogenesis, respectively. 29. Denitrification and sulfate reduction occur in the deep ocean, where there is an absence of oxygen.30. Nitric oxide reductase ( P450nor ) is a P450 enzyme involved in denitrification in several fungal species.
