nitrogen cycle

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nitrogen cycle

n.
The circulation of nitrogen in nature, consisting of a cycle of chemical reactions in which nitrogen from the atmosphere is fixed in compounds in soil or water, assimilated by plants and animals, released to the soil and water through decomposition, and returned to the atmosphere through denitrification.

nitrogen cycle

n
(Biology) the natural circulation of nitrogen by living organisms. Nitrates in the soil, derived from dead organic matter by bacterial action, are absorbed and synthesized into complex organic compounds by plants and reduced to nitrates again when the plants and the animals feeding on them die and decay. See nitrification, nitrogen fixation

ni′trogen cy`cle


n.
the continuous sequence of natural processes by which nitrogen in the atmosphere and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants and then returned to the air and soil as a result of denitrification and plant decay.
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nitrogen cycle

nitrogen cycle

The continuous process by which nitrogen is exchanged between organisms and the environment. Some of the atmosphere's free nitrogen combines with other elements to form compounds that are deposited in the soil. These are then converted by bacteria, in a process called nitrification, into nutrients that are absorbed by the roots of green plants. Nitrogen is then passed into the food chain and returned to the soil by the metabolism and decay of plants and animals.

nitrogen cycle

The natural circulation of nitrogen (including nitrogen compounds) from air to consuming organisms (plants, animals and bacteria) and back to air.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nitrogen cycle - the circulation of nitrogennitrogen cycle - the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil
biological process, organic process - a process occurring in living organisms
References in periodicals archive ?
PHA has been successfully used to manage algal growth in aquariums and ponds where denitrifying bacteria present in the water feed on PHA pellets and use the energy to convert the nitrate to nitrogen gas (78% of air is nitrogen).
Place will also be working with Easton-basedBlue Ocean Biosystems Inc.to evaluate the use of oolitic aragonite (OA), a calcium carbonate mineral similar to limestone, as a phosphorus mitigant and recovery solution, as well as identifying beneficial indigenous nitrifying and denitrifying bacteria that can colonize and proliferate in OA.
Denitrifying bacteria have been detected in all the OMZs that occur within upwelling areas with high primary productivity, such as Chile and Peru in the Eastern Tropical Pacific (Castro-Gonzalez et al., 2005; Lam et al., 2009; Ward et al., 2009; Castro-Gonzalez et al., 2015).
This is because incomplete denitrifying bacteria lack key nitrite reductase enzymes which enable complete denitrifiers to reduce nitrites [29].
Denitrifiers carry one of two variants of the gene for nitrite reductase: nirS and nirK, which have both been used extensively as molecular markers for denitrifying bacteria [25-29].
Excessive dissolved oxygen made denitrifying bacteria switch from anaerobic to aerobic metabolism so that denitrification was inhibited.
This method was first applied into denitrifying bacteria, but it was also feasible to measurement of low biomass and low gas production, so it was used in this study.
Microorganisms with effective enzymes include Pseudomonas spp., Escherichia coii, Morganella morganii, Rhodococcus spp., Comamanos spp., and denitrifying bacteria.
Molecular tools to assess the diversity and density of denitrifying bacteria in their habitats.
It was observed in the SNAD process that denitrifying bacteria population worked in harmony with AOB and Anammox to remove simultaneously ammonium and COD from the wastewater under oxygen-limited conditions [16].Process Analysis
Among the organisms targeted by GTI's qPCR testing are total bacteria, total archaea, sulfate-reducing bacteria, sulfate-reducing archaea, acid-producing bacteria (acetic and butyric acid producers), iron-oxidizing bacteria, denitrifying bacteria, and methanogens.