[nahy-truh-juh n] /ˈnaɪ trə dʒən/
a colorless, odorless, gaseous element that constitutes about four-fifths of the volume of the atmosphere and is present in combined form in animal and vegetable tissues, especially in proteins: used chiefly in the manufacture of ammonia, nitric acid, cyanide, explosives, fertilizer, dyes, as a cooling agent, etc. Symbol: N; atomic weight: 14.0067; atomic number: 7; density: 1.2506 g/l at 0°C and 760 mm pressure.
1794, from French nitrogène, coined 1790 by French chemist Jean Antoine Chaptal (1756-1832), from comb. form of Greek nitron “sodium carbonate” (see nitro-) + French gène “producing,” from Greek -gen “giving birth to” (see -gen). The gas was identified in part by analysis of nitre. Earlier name (1772) was mephitic air, and Lavoisier called it azote (see azo-).
nitrogen ni·tro·gen (nī’trə-jən)
A nonmetallic element that constitutes nearly four fifths of the air by volume, occurring as a colorless, odorless, almost inert diatomic gas, N2, in various minerals and in all proteins. Atomic number 7; atomic weight 14.0067; melting point -210.00°C; boiling point -195.8°C; valence 3, 5.
A nonmetallic element that makes up about 78 percent of the atmosphere by volume, occurring as a colorless, odorless gas. It is a component of all proteins, making it essential for life, and it is also found in various minerals. Nitrogen is used to make ammonia, nitric acid, TNT, and fertilizers. Atomic number 7; atomic weight 14.0067; melting point -209.86°C; boiling point -195.8°C; valence 3, 5. See Periodic Table. See Note at oxygen.
A chemical element that makes up about four-fifths of the atmosphere of the Earth. Its symbol is N.
Note: Like carbon, nitrogen is a necessary element in the tissues of living things.
[nahy-troj-uh-neys, -neyz, nahy-truh-juh-] /naɪˈtrɒdʒ əˌneɪs, -ˌneɪz, ˈnaɪ trə dʒə-/ noun, Biochemistry. 1. an enzyme complex that catalyzes the reduction of molecular in the nitrogen-fixation process of bacteria. nitrogenase ni·trog·e·nase (nī-trŏj’ə-nās’, -nāz’, nī’trə-jə-) n. An enzyme of certain bacteria that activates the conversion of nitrogen to ammonia. nitrogenase (nī-trŏj’ə-nās’, nī’trə-jə-) An enzyme of nitrogen-fixing bacteria that […]
[nahy-troj-uh-nahyz, nahy-truh-juh-] /naɪˈtrɒdʒ əˌnaɪz, ˈnaɪ trə dʒə-/ verb (used with object), nitrogenized, nitrogenizing. 1. to combine with or add material to. /naɪˈtrɒdʒɪˌnaɪz/ verb 1. to combine or treat with nitrogen or a nitrogen compound
noun, Biochemistry, Physiology. 1. the difference between the amount of nitrogen taken in and the amount excreted or lost: used to evaluate nutritional balance. nitrogen balance n. The difference between the amount of nitrogen taken into the body and the amount excreted or lost.
noun 1. 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. nitrogen base One of the nitrogen-containing purines (adenine or guanine) or pyrimidines (cytosine, thymine, or uracil) found in the nucleic acids DNA and RNA. The […]