nitrifying bacteria


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Related to nitrifying bacteria: Denitrifying bacteria, Nitrogen fixing bacteria

nitrifying bacteria

(nī′trĭ-fī-ĭng)
Bacteria that induce nitrification, including the nitrite bacteria of the genus Nitrosomonas, which convert ammonia to nitrites, and nitrate bacteria of the genus Nitrobacter, which convert nitrites to nitrates.
References in periodicals archive ?
Isolation and identification of native nitrifying bacterial consortia: Based on the growth observed in the count of nitrifying bacteria, isolation and purification of native bacterial consortia were carried out through reseeding in a minimal mineral agar medium with a composition of 0.66 g [K.sup.2]HP[O.sub.4] x 3[H.sup.2]O, 1 g N[H.sub.4]Cl, 2 g NaS[O.sub.4], 0.2 g MgS[O.sub.4] x 7[H.sup.2]O, and 15 g of Agar-Agar in 1 000 mL of distilled water, adjusting the final pH to 7.5.
The final results of the total count of heterotrophic and nitrifying bacteria showed no significant difference between treatments (p [greater than or equal to] 0.05) and are presented in Table 1.
During the experiment, we observed the presence of nitrifying bacteria inside the reactor at about 3% abundance, which would facilitate the processes of partial nitrification under oxygen limitation.
Effect of Mancozeb on Nitrifying Bacteria. The results on varying concentrations of mancozeb (0-2000 ppm) on nitrifying bacteria (Figure 2) showed gradual decrease in average number of nitrifying bacterial population from 2.14 log cfu at zero ppm to 1.44 log cfu at 2000 ppm.
Copper is an essential trace element in nitrifying bacteria but becomes toxic as concentrations increase to levels that disrupt normal cellular function (Sato et al.
The biologically active biomass will adhere to the filter material and will create a biological lawn mainly consisting of nitrifying bacteria (Nitrosomonas and Nitrobacter), which will accomplish the oxidation of ammonia to nitrate and further to nitrate.
The depletion of DO in the water, during the rainy season, may have limited the number of nitrifying bacteria in relation to heterotrophic bacteria on the water surface (HARGREAVES, 1998), but the dilution of the water during the rainy period, when rainfall was 240.8 mm, may have contributed to reduce the population of the latter, especially Streptococcus spp.
Seasonal fluctuations are attributive to spore-forming bacteria, including Azotobacter and nitrifying bacteria. The number of bacteria decreases sharply at the soil withering.
"Nitrification potential is a sensitive indicator of stress because nitrifying bacteria are especially sensitive to toxic conditions," White explains.
As a result, the number of bacteria increased up to about four-fold and nitrifying bacteria, which decompose ammonia, intensified their activities some 1.5 times, they said.