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首页> 外文期刊>Environmental Science & Technology >Contrasting Effects of Dissolved Organic Matter on Mercury Methylation by Geobacter sulfurreducens PCA and Desulfovibrio desulfuricans ND132
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Contrasting Effects of Dissolved Organic Matter on Mercury Methylation by Geobacter sulfurreducens PCA and Desulfovibrio desulfuricans ND132

机译：溶解性有机物对土壤杆菌还原性PCA和脱硫脱硫弧菌ND132甲基化汞甲基化的影响

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摘要

Natural dissolved organic matter (DOM) affects mercury (Hg) redox reactions and anaerobic microbial methylation in the environment. Several studies have shown that DOM can enhance Hg methylation, especially under sulfidic conditions, whereas others show that DOM inhibits Hg methylation due to strong Hg-DOM complexation. In this study, we investigated and compared the effects of DOM on Hg methylation by an iron-reducing bacterium Geobacter sulfurreducens PCA and a sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 under non-sulfidic conditions. The methylation experiment was performed with washed cells either in the absence or presence of DOM or glutathione, both of which form strong complexes with Hg via thiol-functional groups. DOM was found to greatly inhibit Hg methylation by G. Sulfurreducens PCA but enhance Hg methylation by D. desulfuricans ND132 cells with increasing DOM concentration. These strain-dependent opposing effects of DOM were also observed with glutathione, suggesting that thiols in DOM likely played an essential role in affecting microbial Hg uptake and methylation. Additionally, DOM and glutathione greatly decreased Hg sorption by G. sulfurreducens PCA but showed little effect on D. desulfuricans ND132 cells, demonstrating that ND132 has a higher affinity to sorb or take up Hg than the PCA strain. These observations indicate that DOM effects on Hg methylation are bacterial strain specific, depend on the DOM:Hg ratio or site-specific conditions, and may thus offer new insights into the role of DOM in methylmercury production in the environment.
机译：天然溶解有机物（DOM）影响环境中的汞（Hg）氧化还原反应和厌氧微生物甲基化。几项研究表明，DOM可以增强Hg甲基化，特别是在硫化条件下，而另一些研究表明DOM由于强的Hg-DOM络合而抑制Hg甲基化。在这项研究中，我们调查和比较了DOM在非硫化条件下对铁还原细菌Geobacter sulphreducens PCA和硫酸盐还原细菌Desulfovibrio desulfuricans ND132对汞甲基化的影响。在不存在或存在DOM或谷胱甘肽的情况下，用洗涤过的细胞进行甲基化实验，两者均通过硫醇官能团与Hg形成强络合物。发现DOM可以极大地抑制G. Sulfurreducens PCA抑制Hg甲基化，但随着DOM浓度的增加，D。desulfuricans ND132细胞增强Hg甲基化。在谷胱甘肽中也观察到了DOM的这些菌株依赖性相反作用，这表明DOM中的硫醇可能在影响微生物吸收汞和甲基化中起着重要作用。此外，DOM和谷胱甘肽大大降低了G.硫还原菌PCA对Hg的吸附，但对脱硫尿D. ND132细胞几乎没有影响，表明ND132与PCA菌株相比具有更高的吸附或吸收Hg亲和力。这些观察结果表明DOM对Hg甲基化的影响是细菌菌株特异的，取决于DOM：Hg比率或特定地点的条件，因此可能为DOM在环境中甲基汞生产中的作用提供新的见解。

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  • 来源
    《Environmental Science & Technology》 |2017年第18期|10468-10475|共8页
  • 作者

    Linduo Zhao; Hongmei Chen; Xia Lu; Hui Lin; Geoff A. Christensen; Eric M. Pierce; Baohua Gu;

  • 作者单位

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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