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首页> 外文期刊>Journal of Hazardous Materials >A Chloroflexi bacterium dechlorinates polychlorinated biphenyls in marine sediments under in situ-like biogeochemical conditions
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A Chloroflexi bacterium dechlorinates polychlorinated biphenyls in marine sediments under in situ-like biogeochemical conditions

机译：绿弯曲菌在原位生物地球化学条件下将海洋沉积物中的多氯联苯脱氯

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摘要

We investigated the reductive dechlorination of Aroclor 1254 PCBs by a coplanar PCB-dechlorinating microbial community enriched from an actual site contaminated marine sediment of the Venice lagoon in sterile slurry microcosms of the same sediment suspended in its site water, i.e., under biogeochemical conditions that closely mime those occurring in situ. The culture dechlorinated more than 75％ of the penta- through hepta-chloorinated biphenyls to tri- and tetra-chlorinated congeners in 30 weeks. The dechlorination rate was reduced by the addition of H_2 and short chain fatty acids, which stimulated sulfate-reduction and methane production, and markedly increased by the presence of vancomycin or ampicillin. DGGE analysis of 16S rRNA genes on PCB-spiked and PCB-free cultures ruled out sulfate-reducing and methanogenic bacteria and revealed the presence of a single Chloroflexi phylotype closely related to the uncultured bacteria m~(-1) and SF1 associated to PCB dechlorination. These findings suggest that a single dechlorinator is responsible for the observed extensive dechlorination of Aroclor 1254 and that a Chloroflexi species similar to those already detected in freshwater and estuarine contaminated sediments mediates PCB dechlorination in the marine sediment adopted in this study under biogeochemical conditions resembling those occurring in situ in the Brentella Canal of Venice Lagoon.
机译：我们研究了共平面多氯联苯-脱氯微生物群落对Aroclor 1254多氯联苯的还原性脱氯作用，该群落从威尼斯泻湖的实际现场污染的海洋沉积物中提取，悬浮在其现场水中悬浮的相同沉积物的无菌浆料微观中，即在生物地球化学条件下，模仿那些原地发生的事情。培养物在30周内将超过75％的五氯至七氯联苯脱氯成三氯和四氯同类物。通过加入H_2和短链脂肪酸降低了脱氯速率，这刺激了硫酸盐的还原和甲烷的产生，并且由于存在万古霉素或氨苄青霉素而显着提高了脱氯速率。对多氯联苯加标和无多氯联苯培养物上的16S rRNA基因进行DGGE分析，排除了硫酸盐还原菌和产甲烷菌，并揭示了与未培养细菌m〜（-1）和SF1密切相关的单一Chloroflexi系统型与PCB脱氯有关。这些发现表明，一个单独的脱氯剂负责观察到的Aroclor 1254的广泛脱氯，并且类似于在淡水和河口污染的沉积物中已经检测到的那些Chloroflexi物种介导了在这项研究中采用的海洋沉积物中的PCB脱氯，其生物地球化学条件类似于发生的情况。原位在威尼斯泻湖的布伦特利亚运河。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.449-457|共9页
  • 作者

    Giulio Zanaroli; Annalisa Balloi; Andrea Negroni; Luigimaria Borruso; Daniele Daffonchio; Fabio Fava;

  • 作者单位

    Department of Civil. Environmental and Materials Engineering (DICAM), Faculty of Engineering, University of Bologna, via Terracini 28.40131 Bologna, Italy;

    Department of Food Science and Microbiology (DISTAM), Faculty of Agriculture. University of Milan, via Celoria 2,20133 Milan, Italy;

    Department of Civil. Environmental and Materials Engineering (DICAM), Faculty of Engineering, University of Bologna, via Terracini 28.40131 Bologna, Italy,ENVIREN (The cluster of environmental laboratories of the Emilia Romagna Region), via Cobetti 101,40129 Bologna, Italy;

    Department of Food Science and Microbiology (DISTAM), Faculty of Agriculture. University of Milan, via Celoria 2,20133 Milan, Italy;

    Department of Food Science and Microbiology (DISTAM), Faculty of Agriculture. University of Milan, via Celoria 2,20133 Milan, Italy;

    Department of Civil. Environmental and Materials Engineering (DICAM), Faculty of Engineering, University of Bologna, via Terracini 28.40131 Bologna, Italy;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polychlorinated biphenyls; reductive dechlorination; marine sediment; chloroflexi; denaturing gradient gel electrophoresis;

    机译：多氯联苯;还原脱氯海洋沉积物叶绿素变性梯度凝胶电泳;

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