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The ability to fix nitrogen is found only in certain bacteria and archaea.Some live in a symbiotic relationship with plants of the legume family (e.g., soybeans, alfalfa)..Some establish symbiotic relationships with plants other than legumes (e.g., alders).Some establish symbiotic relationships with animals, e.g., termites and "shipworms" (wood-eating bivalves).Some nitrogen-fixing bacteria live free in the soil.Nitrogen-fixing cyanobacteria are essential to maintaining the fertility of semi-aquatic environments like rice paddies.

Biological nitrogen fixation requires a complex set of enzymes and a huge expenditure of ATP.

Although the first stable product of the process is ammonia, this is quickly incorporated into protein and other organic nitrogen compounds.

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The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. The processes of the nitrogen cycle transform nitrogen from one form to another. Many of those processes are carried out by microbes, either in their effort to harvest energy or to accumulate nitrogen in a form needed for their growth.Symbiotic nitrogen-fixing bacteria such as Rhizobium usually live in the root nodules of legumes (such as peas, alfalfa, and locust trees).
The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen,[1] making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usa