Chemistry, Biochemistry. a nitrogen-containing organic compound that has the chemical properties of a base, especially a pyrimidine or purine:
Four nitrogen bases are present in a DNA molecule.
One of the nitrogen-containing purines (adenine or guanine) or pyrimidines (cytosine, thymine, or uracil) found in the nucleic acids DNA and RNA. The bases may be attached to a sugar (deoxyribose in DNA, ribose in RNA) to form nucleosides.The addition of a phosphate to a nucleoside results in the formation of a nucleotide, which is the basic constituent of nucleic acids.
noun 1. the continuous sequence of events by which atmospheric nitrogen and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants, the substances returning to the air and soil as a result of the decay of the plants and denitrification. noun 1. […]
noun, Chemistry. 1. a reddish-brown, highly poisonous gas, NO 2 , used as an intermediate in the manufacture of nitric and sulfuric acids, and as a nitrating and oxidizing agent; a major air pollutant from the exhaust of internal combustion engines that are not fitted with pollution control devices. noun 1. a red-brown poisonous irritating […]
- Nitrogen distribution
nitrogen distribution n. See nitrogen partition.
- Nitrogen equivalent
nitrogen equivalent n. The nitrogen content of protein, used in calculating the grams of protein metabolized by the body as a function of the grams of nitrogen excreted in the urine.