Browsing by Author "Johnson T.M."
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Browsing by Author "Johnson T.M."
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Herbel M.J.; Johnson T.M.; Oremland R.S.; Bullen T.D. (2000)Reduction of selenium oxyanions by microorganisms is an important process in the biogeochemical cycling of selenium. Numerous bacteria can reduce Se oxyanions, which are used as electron acceptors during the oxidation of ...
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Gleason J.D.; Moore T.C.; Rea D.K.; Johnson T.M.; Owen R.M.; Blum J.D.; Hovan S.A.; Jones C.E. (2002)Cenozoic pelagic ('red') clays of predominantly eolian and hydrogenous origin blanket much of the central North Pacific ocean basin. The eolian component is a key indicator of past paleoclimatic conditions; thus, Cenozoic ...
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Johnson T.M.; Bullen T.D. (2003)We have determined the extent of Se isotope fractionation induced by reduction of selenate by sulfate interlayered green rust (GRSO4), a Fe(II)-Fe(III) hydroxide-sulfate. This compound is known to reduce selenate to Se(0), ...
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Johnson T.M.; Herbel M.J.; Bullen T.D.; Zawislanski P.T. (1999)Selenium stable isotope ratio measurements should serve as indicators of sources and biogeochemical transformations of Se. We report measurements of Se isotope fractionation during selenate reduction, selenite sorption, ...
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Ellis A.S.; Johnson T.M.; Herbel M.J.; Bullen T.D. (2003)The mobility and bioavailability of Se depend on its redox state, and reduction of Se oxyanions to less mobile, reduced species controls transport of this potentially toxic element in the environment. Stable isotope ...
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