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- W2094642695 endingPage "434" @default.
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- W2094642695 abstract "The abundances of molecules containing more than one rare isotope have been applied broadly to determine formation temperatures of natural materials. These applications of clumped isotopes rely on the assumption that isotope-exchange equilibrium is reached, or at least approached, during the formation of those materials. In a closed-system terrarium experiment, we demonstrate that biological oxygen (O2) cycling drives the clumped-isotope composition of O2 away from isotopic equilibrium. Our model of the system suggests that unique biological signatures are present in clumped isotopes of O2—and not formation temperatures. Photosynthetic O2 is depleted in (18)O(18)O and (17)O(18)O relative to a stochastic distribution of isotopes, unlike at equilibrium, where heavy-isotope pairs are enriched. Similar signatures may be widespread in nature, offering new tracers of biological and geochemical cycling." @default.
- W2094642695 created "2016-06-24" @default.
- W2094642695 creator A5051840540 @default.
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- W2094642695 date "2015-04-24" @default.
- W2094642695 modified "2023-10-16" @default.
- W2094642695 title "Biological signatures in clumped isotopes of O <sub>2</sub>" @default.
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- W2094642695 doi "https://doi.org/10.1126/science.aaa6284" @default.
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