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Sulfur-mediated electron shuttling during bacterial iron reduction.

Sulfur-mediated electron shuttling during bacterial iron reduction.

Science (New York, N.Y.) (2014-05-03)

Theodore M Flynn, Edward J O'Loughlin, Bhoopesh Mishra, Thomas J DiChristina, Kenneth M Kemner

要旨

Microbial reduction of ferric iron [Fe(III)] is an important biogeochemical process in anoxic aquifers. Depending on groundwater pH, dissimilatory metal-reducing bacteria can also respire alternative electron acceptors to survive, including elemental sulfur (S(0)). To understand the interplay of Fe/S cycling under alkaline conditions, we combined thermodynamic geochemical modeling with bioreactor experiments using Shewanella oneidensis MR-1. Under these conditions, S. oneidensis can enzymatically reduce S(0) but not goethite (α-FeOOH). The HS(-) produced subsequently reduces goethite abiotically. Because of the prevalence of alkaline conditions in many aquifers, Fe(III) reduction may thus proceed via S(0)-mediated electron-shuttling pathways.

材料

製品番号

ブランド

製品内容

Sigma-Aldrich

硫黄, powder, 99.98% trace metals basis

Sigma-Aldrich

硫黄, 99.998% trace metals basis

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Carbonyl iron, ≥97% Fe basis

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鉄, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)

Sigma-Aldrich

鉄, granular, 10-40 mesh, >99.99% trace metals basis

Sigma-Aldrich

鉄, foil, thickness 0.1 mm, ≥99.9% trace metals basis

Sigma-Aldrich

鉄, chips, 99.98% trace metals basis

Sigma-Aldrich

鉄, wire, diam. 1.0 mm, ≥99.9% trace metals basis

Sigma-Aldrich

硫黄, flakes, ≥99.99% trace metals basis

Sigma-Aldrich

硫黄, SAJ first grade, ≥98.0%

鉄, foil, 100x100mm, thickness 0.25mm, hard, 99.5%

Sigma-Aldrich

鉄, foil, thickness 0.25 mm, ≥99.99% trace metals basis

Supelco

硫黄, PESTANAL^®, analytical standard

鉄, wire reel, 0.5m, diameter 1.0mm, as drawn, 99.99+%

鉄, foil, 100x100mm, thickness 0.125mm, as rolled, 99.99+%

鉄, foil, 300x300mm, thickness 0.1mm, hard, 99.5%

鉄, tube, 200mm, outside diameter 8.0mm, inside diameter 5mm, wall thickness 1.5mm, annealed, 99.5%

鉄, rod, 200mm, diameter 25mm, as drawn, 98+%

鉄, rod, 100mm, diameter 100mm, as drawn, armcO« soft ingot 99.8%

鉄, foil, 100x100mm, thickness 0.5mm, hard, 99.5%

鉄, rod, 50mm, diameter 5.0mm, as drawn, 99.99+%

鉄, rod, 150mm, diameter 6.0mm, as drawn, 99.99+%

鉄, foil, 150x150mm, thickness 1.5mm, as rolled, 99.5%

鉄, foil, 100x100mm, thickness 1.0mm, as rolled, 99.5%

鉄, foil, 300x300mm, thickness 0.20mm, hard, 99.5%

鉄, rod, 100mm, diameter 2.0mm, as drawn, 99.95%

鉄, foil, 25x25mm, thickness 1.0mm, as rolled, 99.5%

鉄, foil, 50x50mm, thickness 0.1mm, hard, 99.5%

鉄, rod, 1000mm, diameter 19mm, as drawn, soft ingot 99.8%

鉄, foil, 300x300mm, thickness 0.25mm, hard, 99.5%