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- W2078395764 abstract "The oxidation of pyrite in cultures of Acidithiobacillus ferrooxidans (A.f) was studied. The experiments were performed at an initial pH of 2.5 at 28°C. The concentrations of total dissolved iron in solution and the pH were monitored during the first 36 days. Pyrite surfaces were examined by scanning electron microscopy and energy-dispersive spectrometry (SEM-EDS) after 100 days. The concentrations of total dissolved iron and hydrogen ions increased significantly in the presence of bacteria. SEM examination indicated that the crystal surfaces were subjected to two types of dissolution phenomena. Cracks were observable on the of crystal surfaces under both biotic and abiotic conditions, whereas rounded and polygonal pits appeared additionally on the surfaces under biotic conditions. The co-occurrence of the rounded and polygonal pits on the crystal surfaces and the presence of A.f at the pyrite surface suggests that A.f promotes pyrite oxidation by a contact mechanism. We propose that the rounded and polygonal pits be considered to represent a practical biosignature for tracing the evolution of microbial iron oxidation in the remote past." @default.
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- W2078395764 date "2014-09-02" @default.
- W2078395764 modified "2023-10-18" @default.
- W2078395764 title "Experimental Study of Microbial Pyrite Oxidation: A Suggestion for Geologically Useful Biosignatures" @default.
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- W2078395764 doi "https://doi.org/10.1080/01490451.2014.942446" @default.
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