carbon isotope ratio


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carbon isotope ratio

[¦kar·bən ′is·ə‚tōp ‚rā·shō]
(geology)
Ratio of carbon-12 to either of the less common isotopes, carbon-13 or carbon-14, or the reciprocal of one of these ratios; if not specified, the ratio refers to carbon-12/carbon-13. Also known as carbon ratio.
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References in periodicals archive ?
The latest Devonian negative shift in the terrestrial organic carbon isotope ratio, followed by the early Carboniferous positive trend, was reported by Strauss & Peters-Kottig (2003).
Infant and child diet in Neolithic hunter-fisher-gatherers from Cis-Baikal, Siberia: Intra-long bone stable nitrogen and carbon isotope ratios. American Journal of Physical Anthropology 146(2):225-241.
Carbon Isotope Ratios--The leaves that we used to measure leaf mass per area we also used to determine leaf carbon isotope ratios. We combined leaves from one tree into one sample, placed the sample in a mortar, and ground it until a homogenous mixture was formed.
A Mann-Whitney U test performed only for data of these two prey species revealed a highly significant difference in their stable carbon isotope ratios (U = 0.0, P < 0.001), supporting our notion of a bimodal distribution in consumer stable carbon isotope ratios.
Summary statistics for stable carbon isotope ratio ([[delta].sup.13]C) chronologies by site.
The data of gravimetry as well as carbon isotope ratios were analyzed for their statistical significance among the genotypes following a completely randomized design by MSTATC software (Anonymous, 1989).
Mooney HA, Bullock SH, Ehleringer JR (1989) Carbon isotope ratios of plants of a tropical dry forest in Mexico.
Ehleringer JR, Lin Z-F, Field CB, Sun GC, Kuo C-Y (1987) Leaf carbon isotope ratios from a subtropical monsoon forest.
Hydrogen and carbon isotope ratios of selected species of a Mediterranean macchia ecosystem.
The more sugar-sweetened beverages an individual consumes, the greater alanine's carbon isotope ratio will be.
Each organism has its own, measurable carbon isotope ratio, or signature, which remains recognizable through chewing, convesion to animal tissue and on up the food chain.