Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics A minor stable isotope of nitrogen, 157N, having seven protons and eight neutrons; it accounts for less than 0.4% of the natural element; it is used in nuclear magnetic resonance spectroscopy

Etymologies

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Examples

  • Nitrogen exists as two stable isotopes, nitrogen-14 (14N) and nitrogen-15 (15N) that can be separated by chemical exchange or by thermal diffusion.

    Nitrogen

  • The combinations of these ratios things like the ratio of nitrogen-15 to nitrogen-14, as well as the fact that the gas trapped in the rock matches the Martian atmosphere, represent an irrefutable fingerprint proving that these materials originated on Mars.

    The Case for Mars

  • The combinations of these ratios things like the ratio of nitrogen-15 to nitrogen-14, as well as the fact that the gas trapped in the rock matches the Martian atmosphere, represent an irrefutable fingerprint proving that these materials originated on Mars.

    The Case for Mars

  • They fed the plant nematodes loaded with the isotope nitrogen-15, atoms of which have one more neutron than regular nitrogen-14.

    Yahoo! News: Business - Opinion

  • Chemical analysis of the leaves that had been covered in nematodes revealed significant amounts of nitrogen-15, suggesting the plant broke down and absorbed the worms.

    Yahoo! News: Business - Opinion

  • The study found that the ratio of nitrogen-15 isotopes to nitrogen-14 isotopes, which is more common, has changed due to humans burning fossil fuels.

    EcoEarth.Info Environment RSS Newsfeed

  • Next up, the researchers hope to determine how individual sources, both natural and human-caused, of nitric oxides are affecting the ratio between nitrogen-14 and nitrogen-15.

    EcoEarth.Info Environment RSS Newsfeed

  • Next up, the researchers hope to determine how individual sources, both natural and human-caused, of nitric oxides are affecting the ratio between nitrogen-14 and nitrogen-15.

    Mongabay.com News

  • SILAC allows cells to naturally produce proteins that contain "heavy" atoms like carbon-13 and nitrogen-15.

    PhysOrg.com - latest science and technology news stories

  • SILAC allows cells to naturally produce proteins that contain "heavy" atoms like carbon-13 and nitrogen-15.

    PhysOrg.com - latest science and technology news stories

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