Abstract

This paper details current knowledge about nitrogen fixation by cyanobacterial (blue-green algal) heterocysts. I will first review the most direct evidence that aerobic nitrogen fixation is localized in heterocysts; will then recount the results of enzymatic studies which provide examples of specializations apparently supporting this localization; and finally, will consider the little that is known about the mechanisms by means of which heterocysts protect nitrogenase from inactivation by atmospheric oxygen. A broader look at the biology of heterocysts is presented in recent reviews (Haselkorn, 1978; Carr, 1979; Wolk, dy1979b, 1980).

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