nitrogen 15

ni·tro·gen 15 (15N),

The less common stable nitrogen isotope, making up 0.37% of natural nitrogen.
Synonym(s): heavy nitrogen
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The results of the first grain analyses have now been presented, and point to elevated levels of the isotope N15 (nitrogen 15).
They found that the collagen that was deposited when the mammoth was 2 years old had higher-than-average concentrations of nitrogen 15 but lower-than-average concentrations of carbon-13--signs that the animal was then deriving much of its nourishment from its mother's milk, not vegetation.
Fate of legume and fertilizer nitrogen 15 in a long-term cropping systems experiment.
The abundance of natural nitrogen 15 in the organic matter of soils along an altitudinal gradient.