|nitrogen fixation||medical dictionary|
There are several free living bacteria in soil that fix nitrogen including species of Azotobacter, Clostridium and Klebsiella. Rhizobium only fixes nitrogen when in symbiotic association, in root nodules, with leguminous plants. The oxygen sensitive nitrogenase is protected by plant produced leghaemoglobin and the plant obtains fixed nitrogen from the bacteria.
This entry appears with permission from the Dictionary of Cell and Molecular Biology
(11 Mar 2008)
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