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Previously, we showed that anaerobic induction of respiratory nitrate reductase (NR) activity in Bradyrhizobium sp. (Lupinus) USDA 3045 is strongly enhanced by nitrate or nitrite through de novosynthesis. Here, multiple NR-active soluble forms, ranging from 75kDa to 190kDa, were observed under anaerobic conditions. Electrophoretic activity band patterns differed depending on the level and the type...
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