Nitrogen
111nitrogen oxide — noun Date: 1869 any of several oxides of nitrogen most of which are produced in combustion and are considered to be atmospheric pollutants: as a. nitric oxide b. nitrogen dioxide c. nitrous oxide …
112Nitrogen Oxide Protocol — Protocol to the 1979 Convention on Long Range Transboundary Air Pollution Concerning the Control of Emissions of Nitrogen Oxides or Their Transboundary Fluxes, opened for signature on 31 October 1988 and entered into force on 14 February 1991,… …
113nitrogen supersaturation — water in which the concentration of dissolved nitrogen exceeds the saturation level of water. Excess nitrogen can harm the circulatory system of fish …
114nitrogen fixation — The metabolic process in which atmospheric molecular nitrogen is reduced to ammonia; carried out by cyanobacteria, Rhizobium, and other nitrogen fixing bacteria …
115nitrogen fixation — noun the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, especially such conversion, by microorganisms in the soil, into a form that can be assimilated by plants See Also: nitrogen fixing …
116nitrogen lag — The length of time after the ingestion of a given protein before the amount of nitrogen equal to that in the protein has been excreted in the urine. * * * the time that elapses after the administration of a protein before there appears in the… …
117nitrogen partition — Determination of the distribution of nitrogen in the urine among the various constituents. SYN: nitrogen distribution …
118nitrogen washout test — (for functional residual capacity of lungs) with the patient inhaling pure oxygen, the concentration of exhaled nitrogen is obtained for each breath until it falls below 1 per cent of the gas being exhaled (usually about seven minutes time); the… …
119nitrogen washout test single breath — the patient inhales a vital capacity s volume of pure oxygen and then slowly exhales. The nitrogen concentration of the exhaled gas is measured over the entire breath and a curve is generated; different parts of the curve represent nitrogen… …
120nitrogen fixation — noun Biology the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle …
