carbon-13


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carbon-13

[′kär·bən ′thər‚tēn]
(nuclear physics)
A heavy isotope of carbon having a mass number of 13.
References in periodicals archive ?
The seagrass had been labeled with stable isotope carbon-13, so when the sharks consumed it, we could test for a signature of carbon-13 in the sharks' tissues and see if nutrients from the seagrass were actually taken up into the body.
SIMS analyzes the ratio of carbon-13 to carbon-12 isotopes, comparing samples from the alleged fossils with those from empty sections of rock.
To confirm the effectiveness of the integrated crop-livestock approach, scientists use nuclear techniques involving the nitrogen-15 and carbon-13 isotopes.
By seeing carbon-13 in the ribose and other sugars, the researchers knew chemical reactions in the ice, and not uninvited interlopers, were responsible for the results.
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.
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.
The relative abundances of oxygen-18 and carbon-13 are very sensitive to formation temperature.
In a recent project, researchers at the University of Wyoming used the isotopic carbon-13 to carbon-12 ratio to address environmental issues associated with water co-produced with coalbed natural gas.
However, concentrations of carbon-13 in some of the microdiamonds were as low as 58 parts per thousand below normal, the researchers report in their Nature paper.