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vNitrogen fixation is a process in which nitrogen (N2) in the atmosphere is converted into ammonia (NH3).

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Nitrogen fixation is a process in which nitrogen (N2) in the atmosphere is converted into ammonia (NH3).

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A relatively small amount of ammonia is produced by lightning. Some ammonia also is produced industrially by the Haber-Bosch process, using an iron-based catalyst, very high pressures and fairly high temperature. But the major conversion of N2 into ammonia, and thence into proteins, is achieved by microorganisms in the process called nitrogen fixation (or dinitrogen fixation).

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