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学科主题: Biotechnology & Applied Microbiology
题名: Humic analog AQDS and AQS as an electron mediator can enhance chromate reduction by Bacillus sp strain 3C(3)
作者: Hong, YG ; Wu, P ; Li, WR ; Gu, JG ; Duan, SS
通讯作者: yghong@scsio.ac.cn
关键词: Humic reduction ; Electron mediator ; Chromate reduction ; Bacillus sp strain 3C(3)
刊名: APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
发表日期: 2012
卷: 93, 期:6, 页:2661-2668
部门归属: [Hong, Yiguo; Wu, Peng] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Wu, Peng; Li, Wenru; Gu, Jiguang; Duan, Shunshan] Jinan Univ, Inst Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China; [Li, Wenru] Guangdong Inst Microbiol, Guangdong Open Lab Appl Microbiol, Guangzhou 510070, Guangdong, Peoples R China
项目归属: LTO
摘要: Humus as an electron mediator is recognized as an effective strategy to improve the biological transformation and degradation of toxic substances, yet the action of humus in microbial detoxification of chromate is still unknown. In this study, a humus-reducing strain 3C(3) was isolated from mangrove sediment. Based on the analyses of morphology, physiobiochemical characteristics, and 16S rRNA gene sequence, this strain was identified Bacillus sp. Strain 3C(3) can effectively reduce humic analog anthraquinone-2,6-disulfonate (AQDS) and anthraquinone-2-sulfonate (AQS) with lactate, formate, or glucose as electron donors. When the cells were killed by incubation at 95A degrees C for 30 min or an electron donor was absent, the humic reduction did not occur, showing that the humic reduction was a biochemical process. However, strain 3C(3) had low capability of chromate reduction under anaerobic conditions, despite of having strong tolerance of the toxic metal. But in the presence of humic substances AQDS or AQS, we found that chromate reduction by strain 3C(3) was enhanced greatly. Because strain 3C(3) is an effective humus-reducing bacterium, it is proposed that humic substances could serve as electron mediator to interact with chromate and accelerate chromate reduction. Our results suggest that chromate contaminations can be detoxified by adding humic analog (low to 0.1 mM) as an electron mediator in the microbial incubation.
语种: 英语
WOS记录号: WOS:000301181600042
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10209
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Hong, YG; Wu, P; Li, WR; Gu, JG; Duan, SS.Humic analog AQDS and AQS as an electron mediator can enhance chromate reduction by Bacillus sp strain 3C(3),APPLIED MICROBIOLOGY AND BIOTECHNOLOGY,2012,93(6):2661-2668
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