The Effect of Various Nitrogen Sources upon Heterocyst Formation inAnabaena Flos-AquaeA–37

Abstract
Heterocysts are formed abundantly in cultures of Anabaena flos-aquae A-37 which are fixing nitrogen. Fewer are formed in the presence of NO3 ions, whereas none occurred in the presence of NH4+ ions. The results indicate that heterocysts may have a role in nitrogen metabolism.

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