| 释义 |
nitrification
ni·tri·fy N0116400 (nī′trə-fī′)tr.v. ni·tri·fied, ni·tri·fy·ing, ni·tri·fies 1. To oxidize (an ammonia compound) into a nitrite or (a nitrite) into a nitrate, especially by the action of nitrifying bacteria.2. To treat or combine with nitrogen or compounds containing nitrogen.
ni′tri·fi·ca′tion (-fĭ-kā′shən) n.ni′tri·fi′er n.nitrification (ˌnaɪtrɪfɪˈkeɪʃən) n1. (Biochemistry) the oxidation of the ammonium compounds in dead organic material into nitrites and nitrates by soil nitrobacteria, making nitrogen available to plants. See also nitrogen cycle2. (Chemistry) a. the addition of a nitro group to an organic compoundb. the substitution of a nitro group for another group in an organic compoundni·tri·fi·ca·tion (nī′trə-fĭ-kā′shən) The process by which bacteria in soil oxidize ammonia and form nitrates and nitrites. Because the nitrates and nitrites can be absorbed by the roots of green plants, nitrification is an important step in the nitrogen cycle.Thesaurus| Noun | 1. | nitrification - the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)chemical action, chemical change, chemical process - (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved | | 2. | nitrification - the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)plant life, flora, plant - (botany) a living organism lacking the power of locomotionoxidation, oxidisation, oxidization - the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction |
Translations
Nitrification
nitrification[‚nī·trə·fə′kā·shən] (microbiology) Formation of nitrous and nitric acids or salts by oxidation of the nitrogen in ammonia; specifically, oxidation of ammonium salts to nitrites and oxidation of nitrites to nitrates by certain bacteria. Nitrification the microbiological conversion of ammonium salts to nitrates, the main form of nutrient nitrogen for plants. Nitrification takes place in the soil and in bodies of water. It is the final stage of the mineralization of organic nitrogen compounds, which begins with ammonification, and it is an index of soil fertility. The process is caused by chemosynthesizing nitrifying bacteria. Nitrification proceeds in two stages. An ammonium ion is oxidized to a nitrite ion by bacteria of the first stage, and then the nitrite ion is oxidized to a nitrate ion by bacteria of the second stage. Nitrification takes place at a soil pH of 5–9 and is carried out by aerobic organisms. An insufficiency of air in the soil leads to cessation of nitrification. Proper soil management improves aeration, thus intensifying nitrification. As a result of the increasing combustion of fuel in industrial plants and internal-combustion engines, nitrogen oxides are formed in the atmosphere and are deposited in large amounts in the soil and in the water of reservoirs with rainfall. They are then converted to nitrates by the action of nitrifying bacteria. The excess concentration of nitrates in water makes it unsuitable for drinking. To prevent large-scale formation of nitrates in water, chemical preparations that prevent nitrification in the soil are sometimes used. G. A. ZAVARZIN nitrification
nitrification [ni″trĭ-fĭ-ka´shun] the bacterial oxidation of ammonia and organic nitrogen to nitrites and nitrates in the soil.ni·tri·fi·ca·tion (nī'tri-fi-kā'shŭn), 1. Bacterial conversion of nitrogenous matter into nitrates. 2. Treatment of a material with nitric acid. ni·tri·fi·ca·tion (nī'tri-fi-kā'shŭn) 1. Bacterial conversion of nitrogenous matter into nitrates. 2. Treatment of a material with nitric acid. nitrification the conversion by soil BACTERIA of organic nitrogen into inorganic nitrates which plants can take up. Decay of animal and plant proteins gives rise to ammonium compounds which the bacteria Nitrosomonas and Nitrococcus oxidize to nitrite. Nitrobacter oxidizes nitrites to nitrates. See NITROGEN CYCLE.nitrification
Related to nitrification: Nitrifying bacteria, nitrogen cycleWords related to nitrificationnoun the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)Related Words- chemical action
- chemical change
- chemical process
noun the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)Related Words- plant life
- flora
- plant
- oxidation
- oxidisation
- oxidization
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