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      A simplified protocol for measurement of Ca isotopes in biological samples

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          Biological control of calcium isotopic abundances in the global calcium cycle

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            Calcium isotope fractionation between soft and mineralized tissues as a monitor of calcium use in vertebrates.

            Calcium from bone and shell is isotopically lighter than calcium of soft tissue from the same organism and isotopically lighter than source (dietary) calcium. When measured as the (44)Ca/(40)Ca isotopic ratio, the total range of variation observed is 5.5 per thousand, and as much as 4 per thousand variation is found in a single organism. The observed intraorganismal calcium isotopic variations and the isotopic differences between tissues and diet indicate that isotopic fractionation occurs mainly as a result of mineralization. Soft tissue calcium becomes heavier or lighter than source calcium during periods when there is net gain or loss of mineral mass, respectively. These results suggest that variations of natural calcium isotope ratios in tissues may be useful for assessing the calcium and mineral balance of organisms without introducing isotopic tracers.
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              Riverine evidence for a fractionated reservoir of Ca and Mg on the continents: Implications for the oceanic Ca cycle

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                Author and article information

                Journal
                JASPE2
                Journal of Analytical Atomic Spectrometry
                J. Anal. At. Spectrom.
                Royal Society of Chemistry (RSC)
                0267-9477
                1364-5544
                2014
                2014
                : 29
                : 3
                : 529
                Article
                10.1039/c3ja50337b
                cb4da3a9-8de4-4f52-acbd-f61f41773e2e
                © 2014
                History

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