The δ18O value of nitrate produced during nitrification (δ18ONO3, nit) was measured in
experiments designed to mimic oceanic conditions, involving cocultures of ammonia …

We elucidate the controls on the δ18O values of microbially produced nitrate by tracking the
δ18O of nitrite and nitrate during bacterial nitrite oxidation, which is the final step of the …

The ability to use δ18O values of nitrous oxide (N2O) to apportion environmental emissions
is currently hindered by a poor understanding of the controls on δ18O–N2O from nitrification …

Measurements of the stable isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in
nitrate (NO3–) enable identification of sources, dispersal, and fate of natural and …

Nitrification is a microbially-catalyzed process whereby ammonia (NH 3) is oxidized to nitrite
(NO 2−) and subsequently to nitrate (NO 3−). It is also responsible for production of nitrous …

Nitrous oxide (N 2 O) is a trace gas that contributes to the greenhouse effect and
stratospheric ozone depletion. The N 2 O yield from nitrification (moles N 2 ON produced per …

We report the first measurements of coupled nitrogen (N) and oxygen (O) isotopic variations
of nitrate (NO) during its assimilation by laboratory cultures of marine phytoplankton and …

This chapter focuses on very recent developments and their implications for nitrogen cycling
in the marine environment. Nitrification does not influence the net N inventory of the ocean …

Nitrification is the process whereby ammonium (NH4 þ) is oxidized to nitrite (NO2 À) and
then to nitrate (NO3 À). It thus links the most oxidized and most reduced components of the …

Coupled measurements of nitrate (NO3−), nitrogen (N), and oxygen (O) isotopic composition
(δ15NNO3 and δ18ONO3) were made in surface waters of Monterey Bay to investigate …