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Specific Inhibitors of Ammonia Oxidation in Nitrosomonas

¹ Department of Genetics and Cell Biology, University of Minnesota, St. Paul, Minnesota 55101

ABSTRACT

The following compounds or treatments have been shown to inhibit the oxidation of ammonia, but not the oxidation of hydroxylamine in cells of Nitrosomonas: (i) metal-binding agents such as allylthiourea or potassium cyanide; (ii) compounds such as SKF 525 which interact with cytochrome P-450 of mammalian microsomes; (iii) carbon monoxide; (iv) inhibitors of catalase, peroxidase, and amine oxidases such as thiosemicarbazide, ethylxanthate, and iproniazid, respectively; (v) uncouplers of oxidative phosphorylation such as m-chlorocarbonylcyanidephenylhydrazone; (vi) electron acceptors such as phenazine methosulfate; (vii) compounds such as methanol or N₂O which react with free radicals; and (viii) illumination with 420 lux (5,000 foot candles) of light.

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