DOI: 10.1038/ngeo1894
论文题名: Oxidation and methylation of dissolved elemental mercury by anaerobic bacteria
作者: Hu H. ; Lin H. ; Zheng W. ; Tomanicek S.J. ; Johs A. ; Feng X. ; Elias D.A. ; Liang L. ; Gu B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 9 起始页码: 751
结束页码: 754
语种: 英语
Scopus关键词: anoxic conditions
; dissolved inorganic matter
; geomicrobiology
; health risk
; iron-reducing bacterium
; mercury (element)
; methylation
; methylmercury
; neurology
; oxidation
; sulfate-reducing bacterium
; toxin
; Bacteria (microorganisms)
; Desulfovibrio
; Desulfovibrio alaskensis
; Geobacter
英文摘要: Methylmercury is a neurotoxin that poses significant health risks to humans. Some anaerobic sulphate-and iron-reducing bacteria can methylate oxidized forms of mercury, generating methylmercury. One strain of sulphate-reducing bacteria (Desulfovibrio desulphuricans ND132) can also methylate elemental mercury. The prevalence of this trait among different bacterial strains and species remains unclear, however. Here, we compare the ability of two strains of the sulphate-reducing bacterium Desulfovibrio and one strain of the iron-reducing bacterium Geobacter to oxidize and methylate elemental mercury in a series of laboratory incubations. Experiments were carried out under dark, anaerobic conditions, in the presence of environmentally relevant concentrations of elemental mercury. We report differences in the ability of these organisms to oxidize and methylate elemental mercury. In line with recent findings, we show that D. desulphuricans ND132 can both oxidize and methylate elemental mercury. We find that the rate of methylation of elemental mercury is about one-third the rate of methylation of oxidized mercury. We also show that Desulfovibrio alaskensis G20 can oxidize, but not methylate, elemental mercury. Geobacter sulphurreducens PCA is able to oxidize and methylate elemental mercury in the presence of cysteine. We suggest that the activity of methylating and non-methylating bacteria may together enhance the formation of methylmercury in anaerobic environments. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106708
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Recommended Citation:
Hu H.,Lin H.,Zheng W.,et al. Oxidation and methylation of dissolved elemental mercury by anaerobic bacteria[J]. Nature Geoscience,2013-01-01,6(9)