We examined the effect of light on the oxidation of NH4+ to NO2 by oceanic and estuarine bacteria. Inhibition of NH4+ oxidation by light was more pronounced in the oceanic isolates. The estuarine bacteria, isolated from Chesapeake Bay, produced NO2− at a rate faster than the oceanic isolates. We conclude that photoinhibition of NH4+ oxidation may be less important in estuarine environments than in oceanic ones.
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Horrigan et al. (1990) studied this question.
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