A Case Study for Microbial Biodegradation: Anaerobic Bacterial Reductive Dechlorination of Polychlorinated Biphenyls-From Sediment to Defined Medium

被引:93
作者
Bedard, Donna L. [1 ]
机构
[1] Rensselaer Polytech Inst, Dept Biol, Troy, NY 12180 USA
基金
美国国家科学基金会;
关键词
Dehalococcoides; PCBs; dehalogenation; halorespiration; Aroclor; PCB; bioremediation;
D O I
10.1146/annurev.micro.62.081307.162733
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The history of anaerobic microbial Polychlorinated biphenyl (PCB) dechlorination is traced over 20 years using a case study of PCB dechlorination in the Housatonic River (Massachusetts) as an example. The history progresses from the characterization of the PCBs in the sediment, to cultivation in sediment microcosms, to the identification of four distinct types of PCB dechlorination, to a successful field test, to the cultivation in defined medium of the organisms responsible for extensive dechlorination of Aroclor 1260, and finally to the identification of a Dehalococcoides population that links its growth to the dechlorination of Aroclor 1260. Other PCB dechlorinators have also been identified. Two bacteria strains, o-17 and DF-1, that link their growth to the dechlorination of several PCB congeners belong to a novel clade of putative dechlorinating bacteria within the phylum Chloroflexi. Dehalococcoides ethenogenes strain 195 also dechlorinates several PCB congeners when grown on chlorinated ethenes. Evidence is mounting that Dehalococcoides and other dechlorinating Chloroflexi may play a significant role in the dechlorination of commercial PCBs in situ.
引用
收藏
页码:253 / 270
页数:18
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