Nitrogen-15N

Nitrogen 15-N2 is an isotope gas of nitrogen, commonly used in nuclear magnetic resonance, biological isotope labeling, and the study of protein macromolecular structure.

Nitrogen-¹⁵N₂ (¹⁵N Labeled nitrogen) can be used:
In nitrogen fixation experiments to monitor the resulting metabolites in an organism.
¹⁵N₂ pulse-chase experiments to understand the route of transport of fixed nitrogen from the nodule to the shoot in plants.
To quantify biological N₂ production in agricultural soil.