The microbial nitrogen (N) cycle involves a variety of redox processes that control the
availability and speciation of N in the environment and that are involved with the production …

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

Little is known about dissolved inorganic nitrogen (DIN) transformations in hydrothermal
vent (HV) fluids. Here, we present the first isotopic measurements of nitrate (δ15N and …

Analyses of δ18O of nitrate (NO3–) have been widely used in partitioning NO3–sources.
However the δ18O value of NO3–produced from nitrification (microbial NO3–) is commonly …

RATIONALE The 17O‐excess (Δ17O) of tropospheric ozone (O3) serves as a useful marker
in studies of atmospheric oxidation pathways; however, due to the complexity and expense …

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 …

For more than 60 years, ice from the polar caps has been used to unravel the evolution of
our past climate and environment. Throughout technological improvements, climate …

The stable isotopes, δ15N and δ18O, of nitrite and nitrate can be powerful tools used to
interpret nitrogen cycling in the ocean. They are particularly useful in regions of the ocean …