Abstract
Ammonia oxidation, as measured by nitrite production, was inhibited by 2-chloro-6-trichloromethyl-pyridine (nitrapyrin, N-serve) in the methane-oxidizing bacterium,Methylosinus trichosporium OB3b, and the autotrophic nitrifying organisms,Nitrosococcus oceanus andNitrosomonas marina. 6-Chloropicolinic acid, a hydrolysis product of nitrapyrin, was ineffective as an inhibitor of ammonia oxidation by either the methanotroph or the autotrophs. Picolinic acid (2-carboxy-pyridine), in contrast, inhibited nitrification by the methane-oxidizing bacterium but not by the autotrophic cultures. Picolinic acid may provide a means for differentiating ammonia oxidation attributable to methanotrophs from that resulting from autotrophs in environmental studies.
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