denitrifying bacteria

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denitrifying bacteria:

see nitrogen cyclenitrogen cycle,
the continuous flow of nitrogen through the biosphere by the processes of nitrogen fixation, ammonification (decay), nitrification, and denitrification. Nitrogen is vital to all living matter, both plant and animal; it is an essential constituent of amino acids,
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Denitrifying Bacteria


bacteria that reduce nitrates to molecular nitrogen. Denitrifying bacteria include representatives of Pseudomonas, Achromobacter, Bacillus, and Micrococcus. All denitrifying bacteria are aerobes, and they can oxidize organic matter by means of atmospheric oxygen. However, when anaerobic conditions prevail, they use the oxygen of nitrates as an electron acceptor (“respiration by means of nitrates”). Denitrifying bacteria are grown on culture media with nitrates and an indicator that changes color when the nitrates are reduced. The bacteria are widespread in soil and in the water and soil of bodies of water.

denitrifying bacteria

[dē′nī·trə‚fī·iŋ bak′tir·ē·ə]
Bacteria that reduce nitrates to nitrites or nitrogen gas; most are found in soil.
References in periodicals archive ?
Complete conversion of nitrate into dinitrogen gas in co-cultures of denitrifying bacteria.
However, the number of denitrifying bacteria was not enhanced in our study, probably because any anaerobic conditions caused by agricultural machinery traffic were not sufficient to stimulate those bacteria.
Classic denitrifying bacteria use either oxygen or nitrogen but have a lag (resting) period of some hours to switch between the two.
Our results indicate that in Antarctic soils, fertilisation stimulates denitrifying bacteria to degrade hydrocarbons in the anoxic portion of the soil profile,' Dr Powell said.
Procedures Used for Measurements of Microbial Abundance and Biomass--Soils were analyzed for total microbial biomass and denitrifying bacteria populations one day prior to flooding and on the last day of incubation.
Many kinds of denitrifying bacteria have been isolated from the human oral cavity, upper respiratory tract, and alimentary tract (e.
In any case, as we have seen, natural sources of sulfuric and nitric acid tend to be either episodic (huge volcanic eruptions and forest fires) or unlikely to concentrate the acid regionally (marine algae, denitrifying bacteria, and lightning).
The scientists developed novel polymer carrier beads that are loaded with denitrifying bacteria to create bio-filters for the removal of nitrates from water.
Contract notice: Delivery preparation constituting an additional carbon source for denitrifying bacteria supporting biological nitrogen removal process.