carbon 13

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car·bon 13 (13C),

A stable natural isotope, 1.1% of natural carbon.
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References in periodicals archive ?
The analysis of Carbon-13 and Hydrogen-2 in the woodsticks of the matches, however, determined the suspect's matchbox and the matches at the fire scene had no commonalities.
Gordon et al., "Development of methods and feasibility of using hyperpolarized carbon-13 imaging data for evaluating brain metabolism in patient studies," Magnetic Resonance in Medicine, vol.
Lukacs, Carbon-13 Nuclear Magnetic Resonance Spectral Analysis of Cycloartanol and Related Compounds, Tetrahedron Lett., 16, 1789 (1975).
But the researchers used methanol ice that contained a variety of carbon known as carbon-13; any contaminants would have carried the slightly lighter carbon-12.
Jastrow JD, Boutton TW, Miller RM (1996) Carbon dynamics of aggregate-associated organic matter estimated by carbon-13 natural abundance.
The coverage of nuclear magnetic resonance spectroscopy includes basic concepts; carbon-13 spectra including heteronuclear coupling with other nuclei; spin-spin coupling; other topics in one dimension; and advanced techniques.
For organic chemists, carbon-13 nuclear magnetic resonance (NMR) forms the backbone of routine molecular analysis.
It responds to recent discoveries in a variety of fields that the chemical species of an element (Carbon-13 vs Carbon-14, for instance) determines many factors about its bioavailability and toxicity.
Isotopes are variants of the same chemical element with different atomic weights due to having different numbers of neutrons, such as the most common carbon isotope, carbon-12, and a heavier stable isotope, carbon-13.