nitrogencycle

nitrogencycle
nitrogen cycle n.
1. Ecology. The circulation of nitrogen in nature, consisting of a cycle of chemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by bacteria and plants, eventually returning to the atmosphere by bacterial decomposition of organic matter.
2. Physics. See carbon-nitrogen cycle.

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Universalium. 2010.

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  • carbon-nitrogencycle — car·bon ni·tro·gen cycle (kär bən nīʹtrə jən) n. A chain of thermonuclear reactions in which nitrogen isotopes are formed in intermediate stages and carbon acts essentially as a catalyst to convert four hydrogen atoms into one helium atom with… …   Universalium

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