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Analyzing the inhibitory effect of metabolic uncoupler on bacterial initial attachment and biofilm development and the underlying mechanism

机译：分析代谢解耦对细菌初始附着和生物膜发育的抑制作用及基础机制

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摘要

Metabolic uncouplers inhibit biofilm and biofouling formation in membrane bioreactor (MBR) systems, which have been considered as a potential biofouling control alternative. To better understand the inhibitory mechanism of uncoupler on biofouling, this study investigated the impact of the uncoupler 3, 3', 4', 5-tetra-chlorosalicylanilide (TCS) on biofilm formation of B. subtilis in different development stages. Significant reductions in both the initial bacterial attachment stage and the subsequent biofilm development stage were caused by TCS at 100 μg/L. The motility of B. subtilis in semisolid medium was inhibited by TCS, which explicitly explained the reduction in initial bacterial attachment. Meanwhile, a reduction of extracellular polymeric substance (EPS) secretion owing to TCS suggested why biofilm development was suppressed. In addition, the fluorescent materials in tight-bound EPS (TB-EPS) and loose-bound EPS (LB-EPS) of Bacillus subtilis cultured in different TCS concentrations were distinguished and quantified by three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC). The results of this study suggested that the biofilm inhibitory mechanism of the uncoupler was both a inhibition in bacterial motor ability and a reduction in EPS secretion.
机译：代谢偶像剂抑制膜生物反应器（MBR）系统中的生物膜和生物污垢形成，被认为是潜在的生物污垢控制替代方案。为了更好地了解脱孔器对生物耦合的抑制机制，本研究研究了Unfupoper 3,3'，4'，5-四氯气基胺（TCS）对不同发育阶段的B.枯草芽孢杆菌的生物膜形成的影响。初始细菌附着阶段和随后的生物膜发育阶段的显着降低是由100μg/ L的TC引起的。 B.枯草芽孢杆菌在半固体培养基中的动力受TCS抑制，其明确解释了初始细菌附着的减少。同时，由于TCS的细胞外聚合物物质（EPS）分泌提出了为什么抑制生物膜发育。此外，通过三维激发发射基质（EEM）荧光，区分和定量培养的枯草芽孢杆菌中枯草芽孢杆菌（TB-EPS）和枯草芽孢杆菌的荧光枯草芽孢杆菌的荧光材料光谱学与平行因子分析（PARAFAC）耦合。该研究的结果表明，解耦器的生物膜抑制机制在细菌机动能力和EPS分泌中的降低均为抑制作用。

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  • 来源
    《Environmental research》 |2020年第6期|109390.1-109390.6|共6页
  • 作者

    Xiaochi Feng; Qinglian Wu; Lin Che; Nanqi Ren;

  • 作者单位

    School of Civil and Environmental Engineering Harbin Institute of Technology (Shenzhen) Shenzhen Guangdong 518055 PR China;

    College of Architecture and Environment Sichuan University Chengdu 610065 PR China;

    School of Civil and Environmental Engineering Harbin Institute of Technology (Shenzhen) Shenzhen Guangdong 518055 PR China;

    School of Civil and Environmental Engineering Harbin Institute of Technology (Shenzhen) Shenzhen Guangdong 518055 PR China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 PR China;

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

    Biofilm; Bacterial attachment; Metabolic uncoupler; EPS; EEM;

    机译：生物膜;细菌附着;代谢解耦;EPS;EEM.;

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