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Studies on Nitrite Oxidizing Microorganisms: I. Nitrite Oxidation by Nitrobacter¹

ABSTRACT

Quantities of Nitrobacter sufficient for whole cell and enzyme studies have been obtained by cultivation under forced aeration in a soluble mineral medium. That the nitrite oxidase activity of washed cells and extracts is intimately linked to the cytochrome system was shown by manometric, spectral and inhibition studies. Cytochrome inhibitors but not uncouplers readily inhibited nitrite oxidation. The nitrite-oxidizing system of cell-free extracts was of relatively low activity compared to washed cells.

¹ These studies were aided by a contract between the Office of Naval Research, Department of the Navy, and the University of Florida, NR 103–431.

² Assistant Professor of Bacteriology.

Received for publication July 25, 1960. Accepted for publication September 27, 1960.