Abstract
Effective photoproduction of ammonia from dinitrogen has been achieved in a system consisting of a cell suspension of cyanobacteriumNostoc treated with a low concentration ofl-methionine sulfoximine (MSX). As a result of inactivation of cellular glutamate-ammonia ligase by MSX, growth was prevented, the rate of nitrogenase activity increased and about 90% of ammonia resulting from dinitrogen fixation was exported and accumulated in the ambient medium. The rate of NH4+ production was found to be regulated by different factors such as light-dark cycle, cell density, depth of culture and air bubbling. Ammonia production was stimulated by (i) a culture density corresponding to 1.5 μg chlorophyll a per mL, (ii) a depth of 10 mm, and (iii) continuous illumination for 24 h. The nitrogenase activity was found to be enhanced in the experimental sets where ammonia production was maximal.
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