The circulation and reutilization of nitrogen in both inorganic and organic phases ORThe cycling of nitrogen between organism and the environment..

Nitrogen's movement through soil, air, animals, and plants. 1. Some plants have root nodules that contain nitrogen-fixing bacteria ( Rhizobium). 2. Some soils contain free-living nitrogen-fixing bacteria ( Azotobacter) and cyanobacteria. 3. Excreta and decay products of plants and animals are broken into ammonium salts; bacteria oxidize these to make nitrites and then nitrates (in the presence of oxygen), and finally to return the nitrogen to the air.

( Ped.). The sequences of transformation undergone by nitrogen wherein it is used by one organism, later liberated upon the death and decomposition of the organism and is converted by biological means to its original state of oxidation to be re-used by another organism. ( SSSA).

The natural circulation of nitrogen between organic molecules in living organisms and inorganic molecules in the soil.

Ammonia is created by urea and decomposition. Ammonia is turned into nitites by nitrosomonas bacteria. Nitrites are less harmful than bacteria, but still pose a threat. Nitrites are converted to nitrates by nitrobacter. Nitrates are much less toxic and is used as fertilizer for live plants. It is harmful in great quantities, however, and should be avoided in the reef tank. There are special denitrifying filters which convert nitrates to nitrogen gas, which is explosive in high quantities.

The natural process (nitrification) by which bacteria convert fish waste and other decaying matter into less harmful compounds. See article.

plants can only use nitrogen after it has been converted to nitrate. Nitrates are made either by bacteria in the soil or in some select cases, by the plants themselves. Plants use nitrate to build plant tissue, which is then eaten by animals. When animals die and decompose bacteria and fungi return the nitrogen back to the soil and the cycle starts again.

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

This describes how a fish's bodily waste is broken down in the aquarium. The waste decomposes as toxic Ammonia (NH3). Nitrsomona bacteria convert the Ammonia into Nitrite (NO2), which is also toxic. Nitrobacteria then break down the nitrite into the non-toxic Nitrate (NO3). This Nitrate is then removed from the aquarium by performing partial water changes.

The continuous natural cycle by which nitrogen passes from the atmosphere to soil to organisms and back to the atmosphere.

the movement of nitrogen in different chemical forms from the atmosphere to organisms, and then back to the atmosphere

The succession of biochemical reactions that nitrogen undergoes as it is converted to organic or available nitrogen from the elemental form. Organic nitrogen in waste is oxidized by bacteria into ammonia (NH3).If oxygen is present, ammonia is bacterially oxidized first into nitrite (NO2-) and then into nitrate (NO3-).If oxygen is not present, nitrite and nitrate are bacterially reduced to nitrogen gas, completing the cycle.

The abiotic and biotic pathways that nitrogen travels within an ecosystem. The cycle in which nitrogen is combined with other organic elements into various forms of reactive and non-reactive, organic and inorganic molecules, at times in the atmosphere, in an organism, or in the soil.

The cycle of life, death, and decay involving organic nitrogenous matter is known as the nitrogen cycle. In the nitrogen cycle ammonia is produced from proteins.

The nitrogen cycle describes how organic wastes break down in the aquarium. Fish wastes naturally decompose into ammonia, which is highly toxic. Nitrosomonas bacteria process the ammonia into nitrite, which is also toxic. Nitrobacter bacteria then break down the nitrite into nitrate, which is much less harmful. This is as far as the cycle goes in most tanks, though under the right conditions, the nitrate is further broken down to free nitrogen gas.

(see Nitrification cycle)

The series of chemical and biochemical changes of nitrogen and nitrogenous compounds taking place in the soil - plant - atmosphere continuum.

Nitrogen is used in production of amino acids, proteins, DNA, and RNA. It is limited in the environment. Even though it makes up 78% of the atmosphere, N2 can not be absorbed in that form. Lightning and bacteria convert N2 into compounds that can be used.

The sequence of biochemical changes undergone by nitrogen, wherein it is used by a living organism, liberated upon the death and decomposition of the organism and converted to its original state of oxidation.

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

The cycle of the element nitrogen through ecosystems. Organisms need nitrogen in order to synthesize amino acids and protein. Nitrogen is taken up from the soil by plants in the form of nitrate and converted to plant protein.

The nitrogen cycle describes how wastes are broken down by bacteria in the aquarium. Animal waste breaks down into toxic ammonia (NH3). The ammonia id oxidized by nitrosomonas bacteria into nitrite (NO2), another highly toxic substance. Another bacteria called nitrobacter oxidizes the nitrite into nitrate (NO3), a much less toxic substance. Some systems are capable of taking the process one step further, by using anaerobic bacteria to convert the nitrate into harmless nitrogen gas.

A continuous series of natural processes by which nitrogen successively passes through air, soil, and organisms involving principally organism decay, nitrogen fixation, nitrification, and denitrification. See nitrogen-fixing plants.

The exchange of nitrogen between animals and plants, in which plants convert urea or nitrates to protein, animals digest protein and excrete its nitrogen content an urea, which is taken up again by plants.

A process in which atmospheric nitrogen enters the soil and becomes part of living organisms, and then returns to the atmosphere

The nitrogen cycle is a cycle that contains nitrogen. The nitrogen cycle is the biogeochemical cycle that describes the transformations of nitrogen and nitrogen-containing compounds in nature.