Mechanisms of arsenite elimination by Thiomonas sp. isolated from Carnoulès acid mine drainage |
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Authors: | Katia Duquesne Aurlie Lieutaud Jeanine Ratouchniak Andrs Yarzbal Violaine Bonnefoy |
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Institution: | aLaboratoire de Chimie Bactérienne, IBSM, CNRS, 31 chemin Joseph Aiguier Cedex 20, 13402 Marseille, France;bLaboratorio de Microbiología Molecular y Biotecnología, Facultad de Ciencias, Universidad de Los Andes, Merida 5101, Venezuela |
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Abstract: | Weathering of the arsenopyrite-rich tailings of the Carnoulès abandoned mining site (Gard, France) results in the formation of acid mine waters heavily loaded with arsenic. Dissolved arsenic present in the seepage waters is precipitated within a few meters from the bottom of the tailing dam by microorganisms. From these effluents, we have isolated and characterized a Gram negative bacterium involved in this bioremediation process. This bacterium, which belongs to the Thiomonas genus, is very efficient in removing arsenite from contaminated acidic waters by oxidizing it to arsenate, which precipitates. |
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Keywords: | Arsenic Thiomonas Arsenite oxidase Bioremediation |
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