Nitrogen cycle

Ammonium nitrate is a chemical compound, the nitrate salt of the ammonium cation.

Nitric oxide (nitrogen oxide, nitrogen monoxide) is a molecular, chemical compound with chemical formula of ·NO.

Nitrous acid (molecular formula HNO2) is a weak and monobasic acid known only in solution and in the form of nitrite salts.

Nitrogen fixation is a process in which nitrogen (N2) in the atmosphere is converted into ammonia (NH3).

Uric acid is a heterocyclic compound of carbon, nitrogen, oxygen, and hydrogen with the formula C5H4N4O3.

In enzymology, a ferredoxin—nitrite reductase (EC 1.7.7.1) is an enzyme that catalyzes the chemical reaction NH3 + 2 H2O + 6 oxidized ferredoxin nitrite + 6 reduced ferredoxin + 7 H+ The 3 substrates of this enzyme are NH3, H2O, and oxidized ferredoxin, whereas its 3 products are nitrite, reduced ferredoxin, and H+.

Nitrogenases are enzymes (EC 1.18.6.1EC 1.19.6.1) that are produced by certain bacteria, such as cyanobacteria (blue-green algae).

Nitrosamines are chemical compounds of the chemical structure R1N(–R2)–N=O, that is, a nitroso group bonded to an amine.

Putrefaction is the fifth stage of death, following pallor mortis, algor mortis, rigor mortis, and livor mortis.

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various chemical forms as it circulates among the atmosphere and terrestrial and marine ecosystems.

Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate.

Urea, also known as carbamide, is an organic compound with the chemical formula CO(NH2)2.

Sodium phenylbutyrate is a salt of an aromatic fatty acid, 4-phenylbutyrate (4-PBA) or 4-phenylbutyric acid.

Nitrosyl-O-hydroxide (molecular formula HOON) is an isomer of nitrous acid, which has been experimentally observed in the gas phase.

Amino acids are biologically important organic compounds containing amine (-NH2) and carboxylic acid (-COOH) functional groups, along with a side-chain (R group) specific to each amino acid.