carbon 12

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car·bon 12 (12C),

The standard of atomic mass, 98.90% of natural carbon.
References in periodicals archive ?
SAM's mass spectrometer and tunable laser spectrometer independently measured virtually identical ratios of carbon-13 to carbon-12.
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.
There is a different ratio of carbon-14 and carbon-12 in steroid hormones that are made from plant sources compared with animal sources.
Most of the shells are made of one isotope of carbon, carbon-12, but the amounts of other carbon isotopes can be quite revealing.
One dalton equals one-twelfth (1/12) of the mass of a single atom of the isotope of carbon-12.
In nature, the two most abundant stable carbon isotopes are carbon-12 ([sup.
In the journal article, Rutgers said the researchers detail a way to facilitate the of anaerobic bacteria in cleaning up MTBE by employing carbon isotope fractionation -- the changes in the isotopic ratios of carbon (its different molecular versions, carbon-12 and carbon-13) brought about from the selective degradation of the carbon-12 form in the case of MTBE.
By comparing the ratio of carbon-12 to carbon-13, "We can conclude that there is no active biota on Titan," says Bruno Bezard (University of Paris).
Carbon-14 (which chemically reacts like the much more common and stable carbon-12 and carbon-13) combines with oxygen to form carbon dioxide, and is taken up by plants in photosynthesis.
Living things tend to have a preference for the carbon-12 isotope in their make-up.
The resulting levels of carbon-12, carbon-13, and carbon-14 in atmospheric methane reflect these source and sink contributions.
Two years later, GE announced that researchers William Banholzer and Thomas Anthony had invented the carbon-12 diamond laser.