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Bacterial Reduction

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Jörg Rethmeier – One of the best experts on this subject based on the ideXlab platform.

  • SULFUR ISOTOPE FRACTIONATION DURING Bacterial Reduction AND DISPROPORTIONATION OF THIOSULFATE AND SULFITE
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were

  • sulfur isotope fractionation during Bacterial Reduction and disproportionation of thiosulfate and sulfite
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were <4‰. We observed isotope exchange between the two sulfur atoms of S2O32− leading to a depletion of34S in H2S by up to 12‰ with a comparable enrichment of 34S in SO42−. No isotope fractionation was associated with the anoxygenic phototrophic oxidation of H2S to S2O32−. The depletion of 34S into H2S during the Bacterial Reduction and disproportionation of S2O32− and SO32− may, in addition to sulfate Reduction and the Bacterial disproportionation of elemental sulfur, contribute to the generation of 34S-depleted sedimentary sulfides.

Kirsten Silvia Habicht – One of the best experts on this subject based on the ideXlab platform.

  • SULFUR ISOTOPE FRACTIONATION DURING Bacterial Reduction AND DISPROPORTIONATION OF THIOSULFATE AND SULFITE
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were

  • sulfur isotope fractionation during Bacterial Reduction and disproportionation of thiosulfate and sulfite
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were <4‰. We observed isotope exchange between the two sulfur atoms of S2O32− leading to a depletion of34S in H2S by up to 12‰ with a comparable enrichment of 34S in SO42−. No isotope fractionation was associated with the anoxygenic phototrophic oxidation of H2S to S2O32−. The depletion of 34S into H2S during the Bacterial Reduction and disproportionation of S2O32− and SO32− may, in addition to sulfate Reduction and the Bacterial disproportionation of elemental sulfur, contribute to the generation of 34S-depleted sedimentary sulfides.

Donald E Canfield – One of the best experts on this subject based on the ideXlab platform.

  • SULFUR ISOTOPE FRACTIONATION DURING Bacterial Reduction AND DISPROPORTIONATION OF THIOSULFATE AND SULFITE
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were

  • sulfur isotope fractionation during Bacterial Reduction and disproportionation of thiosulfate and sulfite
    Geochimica et Cosmochimica Acta, 1998
    Co-Authors: Kirsten Silvia Habicht, Donald E Canfield, Jörg Rethmeier

    Abstract:

    In Bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32−) and sulfite (SO32−), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters. We documented isotope fractionations during the Reduction and disproportionation of S2O32− and SO32− by Bacterial enrichments and pure Bacterial cultures from marine and freshwater environments. We also measured the isotope fractionation associated with the anoxygenic phototrophic oxidation of H2S to S2O32− by cyanobacteria. Except for SO32− Reduction, isotope fractionations for these processes have not been previously reported. During the dissimilatory Reduction of SO32−, H2S was depleted in 34S by 6‰, and during the Reduction of S2O32− to H2S, depletions were between 7‰ and 11‰. The largest observed isotope fractionation was associated with the Bacterial disproportionation of SO32− which caused a 34S depletion in H2S of 20–37‰ and a 34S enrichment in sulfate of 7–12‰. During the Bacterial disproportionation of S2O32−, isotope fractionations between the outer sulfane sulfur and H2S and between the inner sulfonate sulfur and SO42− were <4‰. We observed isotope exchange between the two sulfur atoms of S2O32− leading to a depletion of34S in H2S by up to 12‰ with a comparable enrichment of 34S in SO42−. No isotope fractionation was associated with the anoxygenic phototrophic oxidation of H2S to S2O32−. The depletion of 34S into H2S during the Bacterial Reduction and disproportionation of S2O32− and SO32− may, in addition to sulfate Reduction and the Bacterial disproportionation of elemental sulfur, contribute to the generation of 34S-depleted sedimentary sulfides.