976 resultados para diferencial-pulse voltammetry
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The D14C of surface water dissolved inorganic carbon (DIC) in the Southern California Bight was compared to D14C as recorded by the sterols in Santa Monica and Santa Barbara Basin sediments. All of the C26, C27, C28, and C29 sterols as well as dinosterol had 14C concentrations equal to surface water DIC, indicating that all of the major sterols were derived from phytoplanktonic production. There is no detectable terrestrial component. Their tracer capability was confirmed by comparing the "bomb 14C"-derived change in surface water D14CDIC with the change in D14Csterol. The "prebomb" D14CDIC was -82 per mil, and prebomb sterols averaged -75±19 per mil. The D14C value in 1996 was +71 per mil. Eighteen measurements representing eight different sterols from the sediment-water interface of both Santa Monica and Santa Barbara Basins averaged +62±23 per mil. When three of these values were eliminated because of suspected contamination, the remaining data averaged +71 ±12 per mil. The entire compound class could serve as an excellent proxy for the 14C concentration of ocean surface waters.
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"Reactor Technology."
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National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.
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Vita.
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"Supported in part by the Office of Naval Research under Contract N000 14-67-A-0305-0007."
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"Contract AT-30-1-Gen-366."
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At head of title: Combustion Dynamics Division, Air Force Office of Scientific Research, ARDC, Washington, D. C., File no. AF 18(600)-1332.
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Stamped at head of title: RADC-TR-61-247.
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Mode of access: Internet.
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Mode of access: Internet.
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Nota en cubierta: "Certamen literario de 1846. Disertante Dn. Benito Garcia de los Santos. Arguyentes Sres. Claramunt y Torrellas"
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Tít. entresacado del texto.
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Mode of access: Internet.
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Mode of access: Internet.
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Port. con esc. real.