Nitrogen-fixation meaning

The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes.
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The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.
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The conversion of atmospheric nitrogen into nitrogenous compounds by bacteria (nitrogen fixers) found in the root nodules of legumes and certain other plants, and in the soil.
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The conversion of free nitrogen into nitrogenous compounds of commercial value by any of various processes.
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The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes.
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The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.
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The process by which free nitrogen from the air is combined with other elements to form inorganic compounds, such as ammonium ions, which can then be converted by nitrification into nutrients that can be readily absorbed by plants and other organisms for incorporation into more complex organic compounds. During lighting strikes, the atmosphere's free nitrogen molecules (N2 ) are broken apart and combine with oxygen to form nitrogen oxides that dissolve in rain to form nitric acid; atmospheric nitrogen is also fixed industrially under high pressure and heat to form ammonia, as in the production of fertilizers. Many species of cyanobacteria and certain other forms of bacteria, especially those that live in the roots of legumes, conduct nitrogen fixation as part of their metabolism, using the enzyme nitrogenase to combine nitrogen with hydrogen as ammonia. All living organisms are dependent on nitrogen fixation and would ultimately die without it.
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(chemistry, biochemistry) The conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, especially such conversion, by microorganisms in the soil, into a form that can be assimilated by plants.
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