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首页> 外文期刊>Environmental Science & Technology >Stimulatory and inhibitory effects of organohalides on the dehalogenating activities of PCB-dechlorinating bacterium o-17
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Stimulatory and inhibitory effects of organohalides on the dehalogenating activities of PCB-dechlorinating bacterium o-17

机译：有机卤化物对多氯联苯脱氯细菌o-17的脱卤活性的刺激和抑制作用

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摘要

Bacterium o-17, a microorganism capable of the ortho dechlorination of 2,3,5,6-polychlorinated biphenyl (PCB), is a member of a sediment-free, nonmethanogenic mixed culture. The culture was examined for the ability to dechlorinate 26 PCB congeners, 12 chlorobenzenes (CBZs), and 6 chlorinated ethenes (CEs). Eight of the PCBs and 4 of the CBZs were dechlorinated including single-flanked ortho PCB chlorines, but double-flanked chlorines of PCBs and CBZs were preferentially dechlorinated. The dechlorination of three of the PCBs (2,3,4,5,6-, 2,3,4,6-, and 2,3,5,6- PCB), three of the CBZs (hexa-, penta-, and 1,2,3-CBZ), and PCE could be sustained for three or more sequential transfers of the bacterial community. Two PCBs (2,3,4- and 2,3,5-PCB), two CBZs (1,2,3,5- and 1,2,4,5-CBZ), and trichloroethene were dechlorinated only when a more extensively chlorinated parent compound was present. Aroclor 1260 and 2,4,6-PCB, not dechlorinated by the culture, inhibited the dechlorination of 2,3,5,6- PCB. Within the culture only bacterium o-17 was linked to dechlorination by PCR-DGGE analysis, confirming that this dehalogenating species was the catalyst for the dechlorination of the compounds tested. The microorganism is capable of dechlorinating several different congeners of PCBs, CBZs, and CEs, and it remains a rare example of an ortho-PCB dechlorinator. However, its limited ability to dechlorinate more extensively chlorinated congeners and Aroclor plus the inhibitory effects of some PCB congeners upon the bacterium is consistent with the observed infrequency of this reaction in the environment. An assessment of bioremediation potential of this microorganism in situ will require a greater understanding of the synergistic, cometabolic and competitive interactions of PCB dechlorinating microbial communities.
机译：o-17细菌是一种能够对2,3,5,6-多氯联苯（PCB）进行邻位脱氯的微生物，是无沉淀，无甲烷的混合培养物的成员。检查了培养物对26种PCB同类物，12种氯苯（CBZs）和6种氯化乙烯（CE）进行脱氯的能力。多氯联苯中的8种和CBZ中的4种进行了脱氯，包括单侧邻氯联苯氯，但PCB和CBZ中双侧氯优选进行了脱氯。三个PCB（2、3、4、5、6-，2、3、4、6-和2,3、5、6- PCB），三个CBZ（六，五，1,2,3-CBZ）和PCE可以持续三个或三个以上细菌群落的顺序转移。仅在以下条件下将两个PCB（2,3,4-和2,3,5-PCB），两个CBZ（1,2,3,5-和1,2,4,5-CBZ）和三氯乙烯脱氯存在大量氯化的母体化合物。未通过培养物脱氯的Aroclor 1260和2,4,6-PCB抑制了2,3,5,6-PCB的脱氯。在培养物中，只有细菌o-17通过PCR-DGGE分析与脱氯反应，从而证实该脱卤物质是所测试化合物脱氯的催化剂。该微生物能够对PCB，CBZ和CE的几种不同的同类物进行脱氯，并且它仍然是原PCB脱氯器的稀有实例。但是，它对更广泛的氯化同类物和Aroclor进行脱氯的能力有限，加上某些PCB同类物对细菌的抑制作用，与​​在环境中观察到的该反应的频率不高相符。对这种微生物原位生物修复潜力的评估将需要对PCB脱氯微生物群落的协同，代谢和竞争性相互作用有更深入的了解。

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