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Internal Membrane Control in Azotobacter vinelandii

Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706

ABSTRACT

Azotobacter vinelandii was grown on N₂, NH₄⁺, or NO₃^–, and an internal membrane network was observed by electron microscopy of thin sections of cells. Cells obtained in early exponential growth contained less internal membrane than did cells from cultures in late exponential growth. It seems likely that O₂ has a role in regulating the amount of internal membrane structure.