The initial organic products of fixation of 13N-labeled nitrogen gas by the blue-green alga Anabaena cylindrica

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Abstract

Methods have been developed for the rapid isolation and characterization of the first organic products of fixation of 13N-labeled N2. In experiments with the blue-green alga, Anabaena cylindrica, glutamine is the first 13N-labeled organic product observed, and glutamate is the second. The results indicate that the glutamine synthetase/glutamate synthase pathway is operative in this blue-green alga.

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