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Identification de biosignatures structurales, chimiques et isotopiques à l'interface bactérie/minéral dans le système Acidithiobacillus ferrooxidans/pyrite :

Abstract : This study aimed to determine reliable biosignatures of the Acidithiobacillus ferrooxidans/pyrite system through a better understanding of the bio-oxidation process at the mineral surface. A new model of pyrite bio-oxidation has been proposed based on the identification of two distinct electron transfer mechanisms on the mineral lattice reflecting the effect of both adherent and non-adherent bacteria. Bio-oxidation induces the development at the pyrite surface of deep corrosion pittings. Micrometric monophased anhydrous sulphates and hematite with extremely variable d18O (from -20 to +25 ) are formed through specific surface mechanisms not in equilibrium with the bulk reactional medium. Even if this system is a quite simple one, a large surface heterogeneity is observed due to the complexity of the surface bio-oxidation mechanisms. Consequently, there is not a unique biosignature of this system but a succession of clues betraying a biological activity at the mineral surface
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Céline Pisapia. Identification de biosignatures structurales, chimiques et isotopiques à l'interface bactérie/minéral dans le système Acidithiobacillus ferrooxidans/pyrite :. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL034N⟩. ⟨tel-01752554⟩

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