Ammonia is produced by the deamination of excess amino acids in the liver.
The participation of ammonia in the nitrogen cycle is a most important natural process. By means of nitrogenase enzymes, nitrogen-fixing bacteria are able to achieve similar reactions to those of the Haber process, but under normal conditions of temperature and pressure. The reactions release ammonium ions, which are converted by nitrifying bacteria into nitrite and nitrate ions. All rights reserved.