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Denitrifying bacteria have been identified in over 50 genera with over 125 different species and are estimated to represent 10-15% of bacteria population in water, soil and sediment. [3] Denitrifying include for example several species of Pseudomonas, Alcaligenes, Bacillus and others. Pseudomonas stutzeri, a species of denitrifying bacteria
Enzymes NapAB, NirS, NirK and NosZ are located in the periplasm, a wide space bordered by the cytoplasmic and the outer membrane in Gram-negative bacteria. [16] A variety of environmental factors can influence the rate of denitrification on an ecosystem-wide scale. For example, temperature and pH have been observed to impact denitrification rates.
The denitrifying property of Paracoccus denitrificans has been used in creating a bioreactor, in this case, a tubular gel containing two bacteria, for the removal of nitrogen from wastewater. Paracoccus denitrificans reduces nitrite to nitrogen gas while Nitrosomonas europaea oxidizes ammonia to nitrite, thus fueling the former metabolism.
Water treatment often relies on the activity of anaerobically denitrifying bacteria in order to remove nitrate from water. [5] However, due to the absence of oxygen, nitrate cannot be fully reduced to dinitrogen, thus nitrate remains in the water or it is converted to nitrous oxide. [5]
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Hydrogen-oxidizing and denitrifying bacteria may be abundant in vents where NO 3 −-containing bottom seawater mixes with hydrothermal fluid. [11] Desulfonauticus submarinus is a hydrogenotroph that reduces sulfur-compounds in warm vents and has been found in tube worms R. pachyptila and Alvinella pompejana.
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Oxygen is produced by plants and some bacteria in photosynthesis, while CO 2 is a waste product of all animals and plants. Nitrogen gases are produced by denitrifying bacteria and as a waste product, and bacteria for decaying yield ammonia, as do most invertebrates and vertebrates.