Quinone-mediated reduction of selenite and tellurite by Escherichia coli.
Quinone-mediated reduction of selenite and tellurite by Escherichia coli.
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DOI：
10.1016/j.biortech.2010.11.078
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发表时间：
2011-02
影响因子：
11.4
通讯作者：
Xiu-qing Wang;Guangfei Liu;Ji-ti Zhou;Jing Wang;Ruofei Jin;H. Lv
中科院分区：
文献类型：
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作者：
Xiu-qing Wang;Guangfei Liu;Ji-ti Zhou;Jing Wang;Ruofei Jin;H. Lv
The reduction of selenite (Se(IV)) and tellurite (Te(IV)) by Escherichia coli was significantly enhanced by various quinone redox mediators (lawsone, menadione, anthraquinone-2-sulfonate, and anthraquinone-2,6-disulfonate). In the presence of 0.2mM lawsone, over 99.1% Se(IV) and around 96.4% Te(IV) were reduced in 8h, at average reduction rates of 9.1 and 7.6mMgcell−1h−1, respectively. Better mediated reduction of Se(IV) and Te(IV) were observed when lawsone concentration increased from 0.1 to 0.4mM and cell concentration increased from 0.1 to 0.6gl−1, respectively. Transmission electron microscopy analysis revealed the formation of both intracellular and extracellular Se(0) nanospheres or Te(0) nanorods, and the presence of lawsone increased the formation and accumulation of extracellular precipitates. The efficient mediated microbial reduction of Se(IV)/Te(IV) may be exploited for pollution removal and biological nanomaterials production.
