发酵
细菌
磺胺
胞外聚合物
无氧运动
化学
活性污泥
生物
微生物学
质粒
食品科学
基因
生物化学
废水
生物膜
废物管理
有机化学
工程类
生理学
遗传学
作者
Yinguang Chen,Haining Huang,Xiong Zheng
标识
DOI:10.1016/j.biortech.2019.121636
摘要
This study assessed potential effects of two neglected factors (sludge components and pH values) on the fate of sulfonamide (sul) resistance genes during sludge anaerobic fermentation. It was found that sludge with different contents of protein, carbohydrate and humic acid caused no significant changes in the abundances of sul genes. Nevertheless, sul genes were sensitive to pHs (4–10), and the maximum attenuations (0.8–1.1 log unit) were obtained at pH 10. Mechanism exploration indicated that pHs drove the community evolution of sulfonamide resistant bacteria (SRB), most of which were affiliated to the pH-enriched phyla but not the pH-enriched dominant genera. In addition, the relative abundances of SRB were decreased under both acidic and alkaline conditions. Furthermore, the abundances of intI 1 as well as the sul-carrying abilities of plasmid and extracellular DNA were all reduced at test pHs, indicating that the potential of horizontal gene transfer among bacteria was restricted.
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