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首页> 外文期刊>Journal of Hazardous Materials >Distinct effects of hypochlorite types on the reduction of antibiotic resistance genes during waste activated sludge fermentation: Insights of bacterial community, cellular activity, and genetic expression
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Distinct effects of hypochlorite types on the reduction of antibiotic resistance genes during waste activated sludge fermentation: Insights of bacterial community, cellular activity, and genetic expression

机译:次氯酸盐类型对废物活性污泥发酵过程中抗生素抗性基因减少的明显影响:细菌群落,细胞活性和遗传表达的见解

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摘要

The effectiveness of hypochlorites (NaClO and Ca(ClO)(2)) on the reduction of antibiotic resistance genes (ARGs) during waste activated sludge (WAS) fermentation was determined by the quantitative PCR. NaClO and Ca(ClO)(2) exhibited distinct effects on ARGs fates. Ca(ClO)(2) was effective in removing all investigated ARGs, and the efficiency was highly dose-dependent. Unexpectedly, the NaClO treatment attenuated ARGs with lower efficiency and even caused the propagation of certain ARGs (i.e., aadA1 and tetQ) at higher doses. The extracellular polymeric substances dissolution and membrane integrity suggested that unstable NaClO had acute effects on bacteria initially, while it was ineffective to further attenuate ARGs released from hosts due to the rapid consumption of oxidative ClO-. Without lasting and strong oxidative stress, the microbial activities of tolerant ARGs hosts will partially recover and then contribute to the ARGs dissemination across genera. In contrast, solid-state Ca(ClO)(2) was slowly released and exhibited prolonged effects on bacteria by disrupting cell membranes and removing the susceptible ARGs released from hosts. Furthermore, bacterial taxa-ARG network analysis indicated that Ca(ClO)(2) reduced the abundance of potential hosts, and the metabolic pathway and gene expression related to ARGs propagation were significantly downregulated by Ca(ClO)(2), which contributed to efficient ARGs attenuation.
机译:通过定量PCR测定次氯酸盐(NaClO和Ca(2))对废物活性污泥(是)发酵期间的抗生素抗性基因(Args)的减少的有效性。 NaClo和Ca(Clo)(2)对args命运表现出明显的影响。 Ca(CLO)(2)可有效去除所有研究的args,效率高度剂量依赖性。出乎意料的是,Naclo治疗衰减效率较低,甚至导致在较高剂量下造成某些args(即,AADA1和TETQ)的传播。细胞外聚合物物质溶解和膜完整性表明,最初对细菌具有急性作用,而由于氧化Clo-的快速消耗,进一步衰减从宿主释放的args是无效的。在不持久性和强大的氧化应激,耐受性Args宿主的微生物活性将部分地恢复,然后有助于跨属的args传播。相反,通过破坏细胞膜并除去从宿主中释放的易感args,缓慢释放固态Ca(ClO)(2)对细菌的延长作用。此外,细菌税法 - ARG网络分析表明CA(CLO)(2)降低了潜在宿主的丰度,并且通过CA(CLO)(2)显着下调了与ARGS繁殖相关的代谢途径和基因表达,这有助于有效的args衰减。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2021年第3期|124010.1-124010.12|共12页
  • 作者单位

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China|Shanghai Engn Res Ctr Biotransformat Organ Solid Shanghai 200241 Peoples R China;

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China;

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China;

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China;

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China;

    Hohai Univ Minist Educ Key Lab Integrated Regulat & Resource Dev Shallow Nanjing 210098 Peoples R China|Hohai Univ Coll Environm Nanjing 210098 Peoples R China;

    Shanghai Engn Res Ctr Biotransformat Organ Solid Shanghai 200241 Peoples R China|East China Normal Univ Sch Ecol & Environm Sci Shanghai Key Lab Urban Ecol Proc & Ecorestorat Shanghai 200241 Peoples R China;

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

    Hypochlorite treatment; Waste activated sludge (WAS); Antibiotic resistance genes (ARGs); Attenuation; Anaerobic fermentation;

    机译:次氯酸盐处理;废物活性污泥(是);抗生素抗性基因(args);衰减;厌氧发酵;

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