SUBSTRATE OXIDATION AND NITROUS OXIDE UTILIZATION IN DENITRIFICATION

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Abstract
A C/N balance is given for Pseudomonas denitrificans growing under denitrifying conditions in a medium of known composition. Succinate, the H donor, is completely oxidized to CO2, while nitrate is reduced to N2. No nitrous oxide accumulates. Denitrifying resting cells of P. denitrificans can reduce N2O to N2, but a lag period is often observed before the conversion commences. Suitable concns. of azide and dinitrophenol inhibit the utilization of N2O without affecting the reduction of nitrite to N2. This is considered evidence that N2O cannot be the normal precursor of N2 in the reduction of nitrite to N2.

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