1) Active urea oxidation in the presence of added ammonium indicates direct urea oxidation by marine ammonia oxidizers.(2) Substrate affinity regulates the vertical distribution of ammonia, urea, and nitrite in the ocean's interior.(3) Nitrite production from urea oxidation is comparable to that from ammonia oxidation in the energy-starved mesopelagic ocean.
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Wan et al. (2024) studied this question.
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