Nitrifying population

Stehr, G., Bottcher, B., Dittbemer, P., Rath, G., and Koops, H. P. (1995). The ammonia-oxidizing nitrifying population of the River Elbe estuary. FEMS Microbiology Ecology 17. 

Dusek, L. (1995a) Activity of nitrifying populations in grassland soil polluted by polychlorinated-biphenyls (PCBs) Plant and Soil, 176, 273-282. 

Dusek, L. (1995b) The effect of cadmium on the activity of nitrifying populations in two different grassland soils. Plant and Soil, 177, 43-53. 

Wang, R., Zhan, X., Zhang, Y. and Zhao, J. 2011. Nitrifying population dynamics in a redox stratified membrane biofilm reactor (RSMBR) for treating ammonium-rich wastewater. Frontiers of Environmental Science and Engineering in China,5,48-56. 

Nogueira, R. Melo, L.F. Purkhold, U. Wuertz, S. Wagner, M. Nitrifying and heterotrophic population dynamics in biofilm reactors effects of hydraulic retention time and the presence of organic carbon. Water Res. 2002, 36, 469-481. 

Significantly more Nitrobacter inhabited the soil in plots of walnut mixed with European alder than in plots of walnut mixed with autumn-olive or walnut alone. Apparently juglone concentrations were not sufficient to inhibit populations of these nitrifying microorganisms. 

Konig et al. [80-84] demonstrated that microbial sensors are suitable for the summary quantification of nitrifiable compounds (see also Sect. 3.3.1) as well as for the detection of nitrification inhibiting effects. Such biosensors, which contain a mixed population of the nitrifying bacteria Nitrosomonas sp. and Nitrobacter sp., exhibit a specific supplementary metabolic capacity. This enables the amperometric determination of ammonia according the following scheme of nitrification ... 

Nitrification is limited in most soils by the supply rate of NH4+ (40, 41). Competition exists between nitrifiers and vegetation, which may both be limited by the availability of NH4 +. This microbial demand for NH4 +, coupled with the high cation-exchange capacity of most temperate forest soils, leads to surface-water NH4+ concentrations that are usually undetectable. Nitrification rates may also be limited by inadequate microbial populations, lack of water, allelopathic effects (toxic effects produced by inhibitors manufactured by vegetation), or by low soil pH. 

Okabe, S., K. Hiratia, Y. Ozawa, and Y. Watanabe. 1996. Spatial microbial distribution of nitrifiers and heterotrophs in mixed-population biofilms. Biotechnology and Bioengineering 50 24-3 5. 

Juretschko, S., Timmerman, G., Schmid, M., Schleifer, K.-H., Pommerening-Roser, A., Koops, H.-P., et al. (1998). Combined molecular and conventional analyses of nitrifying bacterium diversity in activated sludge Nitrosococcus mobilis and Nitrospira-]ike baacteria as dominant populations. Appl. Environ. Microbiol. 64, 3042—3051. 

The nitrifying bacteria are also very sensitive to high temperatures. Their populations are substantially reduced by exposures to temperatures of 212°F (100°C), and they are virtually eliminated at temperatures hotter than 284°F (140°C). As a result, nitrifying bacteria are often uncommon after a ground fire. The rates of nitrification are correspondingly small, even if there is an abundant substrate of ammonium. 

Populations of heterotrophs (both aerobic and anaerobic) were determined by a cultivation method on the nutrient agar with 7 day incubation at 26 C. The ammonifying, nitrifying and denitrifying bacteria, as well as those oxidizing hydrocarbons were determined on liquid media as a most probable number. The ammonifying bacteria were determined on nutrient broth by employing the... 

Belser, L. W. (1979). Population ecology of nitrifying bacteria. Annu. Rev. Microbiol. 33, 309-333. 

Studies made by Brar and Giddens with an acid Bladen grassland soil (pH 4.6 to 4.8) that was a poor nitrifier led them to conclude that acidity and the resulting low population of nitrifiers was the cause of low nitrification. Nitrification was improved by liming but not by extraction of possible toxic substances, as hypothesized by Theron. Likewise, Molina and Rovira (1964) could find no evidence for a rhizosphere inhibition. 

Biodegradability of PHB films under aerobic, microaerobic, and anaerobic conditions in the presence and absence of nitrate by microbial populations of soil, sludge from anaerobic and nitrifying/denitrifying reactors. 

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