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- W2808522847 abstract "Antibiotic resistance genes (ARGs) in environment have become a growing public concern, due to their potential to be obtained by pathogens and their duplication along cell division. Horizontal gene transfer (HGT) was reported to be responsible for ARGs dissemination in microbes, but the HGT feature in environmental biofilm was still unclear due to insufficient assay tools. To address this challenge, we applied a novel microfluidic system to cultivate thin biofilm by continuous supply of nutrients and close contact between cells. Resembling the living state of biofilm in open environment, this chip visualized the transfer of ARG-encoded plasmids RP4 and pKJK5 to the receptors, e.g., activated sludge bacteria. The average plasmid transfer frequency per receptor (T/R) from RP4-hosted Pseudomonas putida KT2440 to activated sludge bacteria was quantified to be 2.5 × 10-3 via flow cytometry, and T/R for pKJK5-hosted Escherichia coli MG1655 was 8.9 × 10-3, while the corresponding average frequencies per donor (T/D) were diverse for the two host strains as 4.3 × 10-3 and 1.4 × 10-1 respectively. The difference between T/R and T/D was explained by the plasmid transfer kinetics, implying specific purposes of the two calculations. Finally, we collected the transconjugants by fluorescent activated cell sorting and further sequenced their 16S rDNA. Bacteria from phyla Proteobacteria and Firmicutes were found more susceptible to be transconjugants than those from Bacteroidetes. Our work demonstrated that microfluidic system was advantageous in biofilm HGT study, which can provide more insights into environmental ARG control." @default.
- W2808522847 created "2018-06-21" @default.
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- W2808522847 date "2018-11-01" @default.
- W2808522847 modified "2023-10-15" @default.
- W2808522847 title "A novel microfluidic system enables visualization and analysis of antibiotic resistance gene transfer to activated sludge bacteria in biofilm" @default.
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- W2808522847 doi "https://doi.org/10.1016/j.scitotenv.2018.06.012" @default.
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