(n.) The act or process of freeing from nitrogen; also, the condition resulting from the removal of nitrogen.
Example Sentences:
(1) Hb was added to an anaerobic bacterial suspension and denitrification was initiated with either KNO2 or KNO3.
(2) A spectrophotometric method has been developed that uses extracellular hemoglobin (Hb) to trap nitric oxide (NO) released during denitrification as nitrosyl hemoglobin (HbNO).
(3) When [15]nitrite was used as substrate for the N2-forming denitrification, 15N2O, 15NO, and 14N15N were obtained as the products.
(4) Simultaneous processes of nitrification and denitrification were observed in optimal aerated manure similar to activated sludge processes.
(5) In faecal slurries, however, denitrification was a relatively minor route of NO3- dissimilation, since only about 3% of the NO3- was converted to gaseous products, with NO3- being mainly reduced to NO2- and NH4+.
(6) Conversely, energy was conserved when either nitrate, nitrite or nitrous oxide functioned as the oxidants during denitrification-dependent proton translocation experiments.
(7) A highly sensitive denitrification bioassay was developed for detection of NO3- and NO2- in rhizosphere soil samples.
(8) The kinetics of each step of denitrification was examined in resting cell suspensions.
(9) Effects of illumination on denitrification varied with electron donors.
(10) Effects of various inhibitors on denitrification were examined in light-succinate and dark-lactate systems.
(11) The regulation of nitrate respiration at the level of transport by oxygen may represent a major mechanism by which the entire denitrification pathway is regulated in P. aeruginosa.
(12) Mineralization of the labile fraction of the soil organic carbon via microbial denitrification occurred without an observed acclimation period and was rapid compared with PAH degradation.
(13) Denitrification by two of the strains was quantitatively studied using cell suspensions.
(14) Comparison of the cell growth during denitrification indicated that the dissimilatory reduction of nitrate to nitrite is an energetically favorable process in F. oxysporum; however, further reduction of nitrite to N2O might be energy-exhausting and may function as a detoxification mechanism.
(15) The yields varied with sparging rates in agreement with a quantitative model of denitrification (Betlach, M. P., and Tiedje, J.M.
(16) Effects of illumination on the denitrification of nitrite were similar to those involving nitrate.
(17) Our observations provide evidence for a denitrification pathway in vivo of NO2(-)----NO----N2O, and N,N-bond formation catalyzed by NO reductase and not by cytochrome cd1.
(18) One of the reasons for this change is the process of denitrification due to changes in the hydrogeochemical conditions in a layer.
(19) The bulk of the denitrification activity was associated with the accumulation of NO3- in the oxidized surface zone of the sediment, but a secondary denitrification zone was occasionally found in the deeper layers where oxidized patches had been introduced by the burrowing activity of the macrofauna.
(20) Reports of the simultaneous use of oxygen and denitrification by different species of bacteria have become more common over the past few years.
Nitrification
Definition:
(n.) The act, process, or result of combining with nitrogen or some of its compounds.
(n.) The act or process of oxidizing nitrogen or its compounds so as to form nitrous or nitric acid.
(n.) A process of oxidation, in which nitrogenous vegetable and animal matter in the presence of air, moisture, and some basic substances, as lime or alkali carbonate, is converted into nitrates.
Example Sentences:
(1) A comparison of the effects observed for three pesticides, dieldrin, chlorpyrifos and Vorlex, in three soil types with those produced by an antibiotic, a fungicide, a nitrification inhibitor and steam pasteurization of the soil clearly demonstrate the effectiveness of the simple technique.
(2) An experiment on the effects of pesticides on nitrification in the percolator is described.
(3) The sufficient concentration of the active ingredients to inhibit the nitrification are lower than the fungicidal concentrations.
(4) However, nitrification is a cause of significant errors in measuring BOD, particularly when a large population of nitrifying organisms are existing in water such as effluents from biological treatment plants.
(5) Simultaneous processes of nitrification and denitrification were observed in optimal aerated manure similar to activated sludge processes.
(6) The effect of size of structural aggregates on the intensity of nitrification and nitrogenase (nitrogen: acetylene oxidoreductase) activity was investigated in three soils.
(7) Changes in microbial population determined by the dilution plate method, in nitrification by the soil perfusion technique, and in oxygen consumption using a differential respirometer are the only measurements required.
(8) The biotest presented permits the investigation of sewage as for the presence of nitrification-inhibiting substances.
(9) On the contrary, smaller aggregates (0.5-2 mm) exhibited more intensive nitrification.
(10) When nitrate was used, the nitrification was not delayed.
(11) The effects of two herbicides, Sencor and Goltix, on nitrification in two soils were studied using a mixed culture of nitrifying bacteria.
(12) Heterotrophic nitrification by another organism, a strain of "Pseudomonas denitrificans" has also been shown to be inhibited by thiosulphate in short term experiments and in the chemostat.
(13) The combination of increased concentrations of oxidized nitrogen with decreased total chlorine residuals can be used as a rapid indicator of bacterial nitrification.
(14) Bacterial toxicity tests are based on bioluminescence, motility, growth, viability, ATP, oxygen uptake, nitrification, or heat production.
(15) The biotest was successfully applied in order to find out the inhibition of nitrification in a communal purification plant.
(16) Inhibitors thought to be specific to ammonia oxidizers have been used in environmental studies of nitrification.
(17) Ammonification, nitrification, urea transformation, and decomposition of cellulose are enhanced by the increased occurrence of bacteria and actinomycetes.
(18) Sencor (10 ppm, 50 ppm, and 100 ppm) has no inhibitory influence on nitrification.
(19) The overall nitrification activity was, however, essentially unaffected by the oxygen concentration.
(20) Nitrification usually returned to a relative equilibrium in several days after the herbicide application.