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首页> 外文期刊>Environmental Science & Technology >Photoinactivation of Eight Health-Relevant Bacterial Species: Determining the Importance of the Exogenous Indirect Mechanism
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Photoinactivation of Eight Health-Relevant Bacterial Species: Determining the Importance of the Exogenous Indirect Mechanism

机译：八种与健康有关的细菌的光灭活：确定外源间接机制的重要性。

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摘要

It is presently unknown to what extent the endogenous direct, endogenous indirect, and exogenous indirect mechanisms contribute to bacterial photoinactivation in natural surface waters. In this study, we investigated the importance of the exogenous indirect mechanism by conducting photoinactivation experiments with eight health-relevant bacterial species (Bacteroides thetaiotaomicron, Campylobacter jejuni, Enterococcus faecalis, Escherichia coli K12, E. coli O157:H7, Salmonella enterica serovar Typhimurium LT2, Staphylococcus aureus, and Streptococcus bovis). We used three synthetic photosensitizers (methylene blue, rose bengal, and nitrite) and two model natural photosensitizers (Suwannee River natural organic matter and dissolved organic matter isolated from a wastewater treatment wetland) that generated singlet oxygen and hydroxyl radical. B. thetaiotaomicron had larger first order rate constants than all other organisms under all conditions tested. The presence of the synthetic photosensitizers generally enhanced photoinactivation of Gram-positive facultative anaerobes (Ent. faecalis, Staph. aureus, and Strep. bovis). Among Gram-negative bacteria, only methylene blue with E. coli K12 and rose bengal with C. jejuni showed an enhancing effect. The presence of model natural photosensitizers either reduced or did not affect photoinactivation rate constants. Our findings highlight the importance of the cellular membrane and photosensitizer properties in modulating the contribution of the exogenous indirect mechanism to the overall bacterial photoinactivation.
机译：目前尚不清楚内源性直接，内源性间接和外源性间接机制在多大程度上促进了天然地表水中细菌的光灭活。在这项研究中，我们通过对8种与健康相关的细菌（细菌拟杆菌，空肠弯曲杆菌，粪肠球菌，大肠杆菌K12，大肠杆菌O157：H7，肠沙门氏菌血清鼠伤寒沙门氏菌LT2）进行光灭活实验，研究了外源间接机制的重要性。 ，金黄色葡萄球菌和牛链球菌）。我们使用了三种合成光敏剂（亚甲基蓝，玫瑰红和亚硝酸盐）和两种模型天然光敏剂（从污水处理湿地分离出的Suwannee River天然有机物和溶解有机物），产生单线态氧和羟基自由基。在所有测试条件下，B。thetaiotaomicron具有比所有其他生物更大的一阶速率常数。合成光敏剂的存在通常会增强革兰氏阳性兼性厌氧菌（粪肠球菌，金黄色葡萄球菌和牛链球菌）的光灭活。在革兰氏阴性细菌中，只有亚甲基蓝和大肠杆菌K12以及玫瑰红和空肠弯曲杆菌才显示出增强作用。模型天然光敏剂的存在减少或不影响光灭活速率常数。我们的发现突出了细胞膜和光敏剂特性在调节外源性间接机制对总体细菌光灭活的贡献中的重要性。

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  • 来源
    《Environmental Science & Technology》 |2016年第10期|5050-5059|共10页
  • 作者

    Peter A. Maraccini; Jannis Wenk; Alexandria B. Boehm;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States,Engineering Research Center (ERC) for Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt), Stanford, California 94305, United States;

    Department of Civil & Environmental Engineering, University of California, Berkeley, California 94720-1710, United States,Engineering Research Center (ERC) for Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt), Stanford, California 94305, United States,Department of Chemical Engineering and Water Innovation & Research Centre (WIRC), University of Bath, Claverton Down, Bath BA2 7AY, U.K.;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States,Engineering Research Center (ERC) for Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt), Stanford, California 94305, 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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