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Xie Q.,Lanzhou UniversityGansu | Yu L.,Lanzhou UniversityGansu | Li Z.,Lanzhou UniversityGansu | Liu H.,Gansu Corps Hospital of CAPFGansu | And 7 more authors.
International Journal of Mineral Processing

Due to the toxic and un-dissolvable properties, the medical application of realgar (As4S4) has always been limited for a long time. In this study, a novel method of dissolving realgar by immobilized Acidithiobacillus ferrooxidans (A. ferrooxidans) is introduced. The characterizations of dissolving realgar are carried out by means of SEM, ICP-AES, XRD and FTIR. The results suggest that the bio-transformation process is influenced by extracellular substances such as pH value and the oxidation of Fe2 +. These extracellular substances affect the concentration of arsenic in bio-transformation solution rather than A. ferrooxidans. Present study reveals the novel application of A. ferrooxidans. © 2015 Elsevier B.V. All rights reserved. Source

Li W.,University of Science and Technology Beijing | Liu G.,University of Science and Technology Beijing | Wang H.,University of Science and Technology Beijing | Zhang H.,University of Alberta | And 4 more authors.

How grain faces are arranged in three-dimensional grain structures is one of the outstanding problems in physics, biology and materials science. Based on the topological analysis of 477 real pure iron grains and 6093 Monte Carlo simulated grains, two forms of topological correlations are studied. The first correlation is Rivier's relation (Philos. Mag. B, 52 (1985) 795), in which the average number of edges of faces neighboring to e-edged faces on f-faceted grains is related to e and f; and the second correlation is the one derived in the current paper, in which a typical e-edged face in a polycrystal is a function of the average number of edges of its neighboring faces M(e). Both correlations are verified by experimental and simulation data. © Copyright EPLA, 2013. Source

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