Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A minor stable
isotope of nitrogen, 157N, having sevenprotons and eightneutrons ; it accounts for less than 0.4% of the natural element; it is used innuclear magnetic resonance spectroscopy
Etymologies
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Examples
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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 2009
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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 Robert Zubrin 1996
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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 Robert Zubrin 1996
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They fed the plant nematodes loaded with the isotope nitrogen-15, atoms of which have one more neutron than regular nitrogen-14.
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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.
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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.
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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.
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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 2009
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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 2009
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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 2009
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