nitrogen 15

ni·tro·gen 15 (15N),

(nī'trō-jen),
The less common stable nitrogen isotope, making up 0.37% of natural nitrogen.
Synonym(s): heavy nitrogen
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References in periodicals archive ?
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.