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Study on the microbe-mineral interaction and their molecular mechanism based on synchrotron radiation techniques

机译:基于同步辐射技术的微生物矿物相互作用及其分子机制研究

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In order to get insight into the interfacial interaction between bioleaching microorganisms and sulfide minerals and thus evaluate the molecular interaction mechanism, the S/Fe/Cu speciation on the mineral surface, the extracellular polymer substance (EPS), iron speciation, sulfur-activating relevant proteins/genes and thiol groups (-SH) of microbial cells in situ, and the adsorption of cells to the specific mineral surface sites were investigated by using mainly synchrotron radiation-based techniques including S/Fe/Cu X-ray absorption near-edge structure (XANES) spectroscopy, X-ray Diffraction(XRD), micro- X-ray fluorescence (μ-XRF) mapping and micro- scanning transmission X-ray microscopy (μ-STXM) imaging, together with other accessory approaches such as SEM/EDS, Raman spectroscopy, FT-IR spectroscopy, in situ fluorescent staining, cyclic voltammetry, GC-MS as well as proteomics methodology. The most recent progresses to be presented include (1) promotion of model of chalcopyrite dissolution based on S/Fe/Cu speciation, (2) evaluation of the differential utilization mechanisms of two typical allotropes of elemental sulfur, α-S_8 and μ-S, (3) dependence of dissolution efficiency of chalcopyrite on the crystal phase structure, (4) dependence of specific cell adsorption on the surface structure and chemistry of chalcopyrite, (5) evolution in EPS composition of the typical bioleaching microbes responding to different substrates and heavy metal ions.
机译:为了能够了解生物浸出微生物和硫化物矿物质之间的界面相互作用,从而评估分子相互作用机理,S / Fe / Cu形态对矿物表面,细胞外聚合物物质(EPS),铁艺,硫激活相关性通过主要使用基于同步辐射的技术,研究了微生物细胞的蛋白质/基因和硫醇基团(-SH)和对特定矿物表面位点的吸附,包括S / Fe / Cu X射线吸收近边缘结构(XANES)光谱,X射线衍射(XRD),微X射线荧光(μ-XRF)映射和微扫描透射X射线显微镜(μ-STXM)成像,以及SEM等其他附件方法/ EDS,拉曼光谱,FT-IR光谱,原位荧光染色,循环伏安法,GC-MS以及蛋白质组学方法论。待提出的最新进展包括(1)基于S / Fe / Cu形态的核偶溶解模型,(2)评估元素硫,α-S_8和μ-S的两个典型同质的差异利用机制,(3)核黄素溶解效率对晶体相结构的溶解效率,(4)特异性细胞吸附对含氯铜矿表面结构和化学性化学的依赖性,(5)在典型的生物浸入微生物的EPS组合物中响应不同底物的耐磷酸盐组合物中的进化重金属离子。

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