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首页> 外文期刊>Environmental Science & Technology >Nontuberculous Mycobacteria in Two Drinking Water Distribution Systems and the Role of Residual Disinfection
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Nontuberculous Mycobacteria in Two Drinking Water Distribution Systems and the Role of Residual Disinfection

机译：两个饮用水分配系统中的非结核分枝杆菌及其残留消毒的作用

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摘要

Nontuberculous mycobacteria (NTM) are frequently found in chloraminated drinking water distribution systems (DWDSs) due to their chloramine tolerance. NTM were investigated in the water-main biofilms and drinking water of a chloraminated DWDS in the United States (initial chloramine residual = 3.8 +/- 0.1 mg L-1) and a DWDS in Norway with minimal residual disinfectant (0.08 +/- 0.01 mg L-1). Total mycobacteria and Mycobacterium avium complex (MAC) were quantified by qPCR targeting, respectively, atpE genes and the internal transcribed spacer region. Mycobacteria concentrations in drinking water did not differ between the two systems (P = 0.09; up to 6 x 10(4) copies L-1) but were higher in the biofilms from the chloraminated DWDS (P = 5 X 10(-9) ; up to S X 10(6) copies cm(-2)). MAC were not detected in either system. Sequencing of mycobacterial hsp65 genes indicated that the chloraminated DWDS lacked diversity and consisted almost exclusively of M. gordonae. In contrast, there were various novel mycobacteria in the no-residual DWDS. Finally, Mycobacterium- and Methylobacterium-like 16S rRNA genes were often detected simultaneously, though without correlation as previously observed. We conclude that, though residual chloramine may increase mycobacterial biomass in a DWDS, it may also decrease mycobacterial diversity.
机译：非结核分枝杆菌（NTM）因其对氯胺的耐受性而经常在加氯的饮用水分配系统（DWDS）中发现。在美国的氯代DWDS（初始氯胺残留= 3.8 +/- 0.1 mg L-1）和挪威的DWDS中，残留消毒剂最少（0.08 +/- 0.01）的NTM在主要生物膜和饮用水中进行了研究。毫克L-1）。通过分别针对atpE基因和内部转录间隔区的qPCR定量总分枝杆菌和鸟分枝杆菌复合物（MAC）。两种系统之间饮用水中的分枝杆菌浓度没有差异（P = 0.09； L-1最高可达6 x 10（4）个副本），但氯化DWDS的生物膜中的分枝杆菌浓度更高（P = 5 X 10（-9）） ；最多SX 10（6）复制cm（-2））。在两个系统中均未检测到MAC。分枝杆菌hsp65基因的测序表明，氯化DWDS缺乏多样性，几乎完全由戈登分支杆菌组成。相比之下，无残留DWDS中存在各种新型分枝杆菌。最后，尽管没有如先前观察到的相关性，但通常同时检测到分枝杆菌和甲基杆菌样的16S rRNA基因。我们得出的结论是，尽管残留的氯胺可能会增加DWDS中分枝杆菌的生物量，但也可能会降低分枝杆菌的多样性。

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  • 来源
    《Environmental Science & Technology》 |2019年第15期|8563-8573|共11页
  • 作者

    Waak Michael B.; LaPara Timothy M.; Halle Cynthia; Hozalski Raymond M.;

  • 作者单位

    Univ Minnesota, Dept Civil Environm & Geoengn, 500 Pillsbury Dr SE, Minneapolis, MN 55455 USA|Norwegian Univ Sci & Technol, Dept Civil & Environm Engn, SP Andersens Veg 5, N-7491 Trondheim, Norway;

    Univ Minnesota, Dept Civil Environm & Geoengn, 500 Pillsbury Dr SE, Minneapolis, MN 55455 USA|Univ Minnesota, BioTechnol Inst, 1479 Gortner Ave, St Paul, MN 55108 USA;

    Norwegian Univ Sci & Technol, Dept Civil & Environm Engn, SP Andersens Veg 5, N-7491 Trondheim, Norway;

    Univ Minnesota, Dept Civil Environm & Geoengn, 500 Pillsbury Dr SE, Minneapolis, MN 55455 USA|Univ Minnesota, BioTechnol Inst, 1479 Gortner Ave, St Paul, MN 55108 USA;

  • 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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