symbiotic nitrogen fixation
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Nitrogen Fixation, in the biological sense, is run by an enzyme called nitrogenase. The reason why the nitrogenase complex is used is because it has multiple redox centers. In general though, nitrogenase complex contains two proteins.
SYMBIOTIC NITROGEN FIXATION
Diversity of nitrogen-fixing plant-microbe associations.Nitrogen-fixing bacteria are found in several phyla (1), and representatives from most (if not all) of these phyla are known to engage in nitrogen-fixing symbiosis with plants (2). Reciprocally, plants have developed multiple solutions to associate with and accommodate diazotrophs in order to acquire atmospheric nitrogen. Proximity between a bacterial symbiont and plant host is a key element for nutrient exchanges between them and falls into three broad categories, based on the degree of intimacy and interdependency of the plant and microbe: loose associations with free-living nitrogen fixers, intercellular endophytic associations, and endosymbioses.