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 ?
They found that the carbon 13 percentage in the background organic matter in the surrounding rock was different from that of the microstructures.
China) presents an integrated discussion of the structural identification and interpretation of organic compounds with spectroscopic techniques, covering protonic and carbon 13 NMR spectroscopy; two-dimensional NMR spectroscopy, including COSY, NOESY, ROESY, and TOCSY; mass spectroscopy, including electrospray ionization, CI, FAB, MALDI, and APCI; and infrared spectroscopy.
The biomarker O'Brien and her research group pilot-tested was the ratio of two different carbon atoms--heavy carbon 13 and light carbon 12 --which are incorporated into plants during photosynthesis.
The BreathID System is a breath-test platform capable of analyzing parts-per-million changes in carbon 13 and carbon 12 ratios in a patient's breath--intended for use in the qualitative detection of urease associated with Helicobacter pylori in the human stomach and as an aid in initial diagnosis and post treatment monitoring of H pylori infection.
The BreathID System is a breath test platform capable of analyzing parts-per-million changes in carbon 13 and carbon 12 ratios in a patient's breath.
The technique relies on the injection of polarized carbon 13, which breaks down and releases energy once in the body.
The runner-up wins a Borak carbon 13 ft match rod, one of the sport's top sellers.
The carbon 13 isotope is a by-product of photosynthesis, which generates oxygen.
According to Dr Etheridge,, the study attempted to answer some important questions from the analysis of carbon 13 isotopes, including why the atmospheric composition of methane has changed, how much of that change was due to human factors, and why pre-industrial levels were apparently so stable.