Results 241 to 250 of about 67,957 (294)
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Biogeochemistry of Sulfur Isotopes
Reviews in Mineralogy and Geochemistry, 2001Sulfur, with an atomic weight of 32.06, has four stable isotopes. By far the most abundant is 32S, representing around 95% of the total sulfur on Earth. The next most abundant isotope is 34S, followed by 33S, and finally 36S is the least abundant contributing only 0.0136% to the total (Table 1⇓). The natural abundances of sulfur isotopes, however, vary
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Physical Review, 1958
A new isotope of sulfur, ${\mathrm{S}}^{38}$, has been produced by the ($\ensuremath{\alpha}, 3p$) reaction on ${\mathrm{Cl}}^{37}$. It was found to have a half-life of 172\ifmmode\pm\else\textpm\fi{}1 minutes, and to decay by the emission of two beta groups with end-point energies of 1.1 and 3.0 Mev.
D. R. Nethaway, A. A. Caretto
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A new isotope of sulfur, ${\mathrm{S}}^{38}$, has been produced by the ($\ensuremath{\alpha}, 3p$) reaction on ${\mathrm{Cl}}^{37}$. It was found to have a half-life of 172\ifmmode\pm\else\textpm\fi{}1 minutes, and to decay by the emission of two beta groups with end-point energies of 1.1 and 3.0 Mev.
D. R. Nethaway, A. A. Caretto
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Relative sulfur-36-sulfur-34 kinetic isotope effects
Journal of the American Chemical Society, 1985Two sulfur kinetic isotope effects, k/sub 32//k/sub 34/ and k/sub 32//K/sub 36/, were measured for the thermal isomerization of bis(5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinanyl) sulfide to P-oxo-P'-thionobis(5,5-dimethyl-1,3,2-dioxaphosphorinanyl) oxide.
Piotr Paneth, Wladyslaw Reimschuessel
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Centrifugal enrichment of sulfur isotopes
Journal of Radioanalytical and Nuclear Chemistry, 2013This work contains the results of the research for the complete cycle of the centrifuge enrichment process of all sulfur isotopes. As a result of this work there was obtained, and made available (by centrifuge enrichment process), for the first time hundreds of grams of all the isotopes of sulfur to high enrichment.
A. N. Cheltsov +6 more
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Sulfur isotopes and ore deposits
Economic Geology, 1960A geochemical history of the sulfur isotopes in the crust of the earth is presented. New measurements of the S³²/S³⁴ ratio on sulfide minerals are used to show that transport and depositional processes do not appear to produce appreciable variation in the relative abundance of the sulfur isotopes.
Wayne Urban Ault, J. Laurence Kulp
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Sulfur Isotopic Composition of Cenozoic Seawater Sulfate
Science, 1998A continuous seawater sulfate sulfur isotope curve for the Cenozoic with a resolution of ∼1 million years was generated using marine barite. The sulfur isotopic composition decreased from 19 to 17 per mil between 65 and 55 million years ago, increased abruptly from 17 to 22 per mil between 55 and 45 million years ago, remained nearly constant from 35 ...
, Paytan +3 more
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Sources and Isotopic Composition of Atmospheric Sulfur
Science, 1961In nonindustrial areas the prime source of SO--4in rain and snow is atmospherically oxidized H2S that is produced predominately along coastal belts by anaerobic bacteria. The δ S34analyses of atmospheric SO--4vary from +3.2 to +15.6 per mil in contrast to +20.7 per mil for sea water SO--4.
M L, Jensen, N, Nakai
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Preparation of isotopic sulfur targets
Nuclear Instruments and Methods, 1977Abstract An evaporation technique for making sulfur isotope targets of approximately 200 μg/cm2 in thickness or greater is discussed.
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Sulfur Isotopes in Stromatolites
2011Intense biological sulfur cycling characterizes modern marine microbial mats as well as their ancient counterparts – stromatolites. Respective microbially driven processes, such as bacterial sulfate reduction, sulfide oxidation, or the disproportionation of sulfur-bearing compounds of intermediate oxidation states, are associated with distinctive and ...
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Sulfur Isotope Fractionation in the Biogeochemical Sulfur Cycle of Marine Sediments
Isotopes in Environmental and Health Studies, 2001Abstract The sulfur isotopic record of sedimentary sulfides (mainly pyrite) and sulfates shows considerable variations in time and plays an important role in the biological and geochemical interpretation, e.g., of the evolution of life and the oxygen partial pressure of Earth's atmosphere (e.g. [1]).
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