carbon-nitrogencycle

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 the emission of two positrons. The entire sequence is thought to generate significant amounts of energy in the sun and certain other stars. Also called carbon cycle, nitrogen cycle.

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Universalium. 2010.

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  • 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 …   Universalium

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