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Presence of starved, stationary phase-like zones in biofilms seems to be an important factor for biofilm formation. In this study, roles of rpoS gene in the formation of Escherichia coli biofilms were investigated. E. coli MG1655 wild type (WT) and rpoS mutant (DeltarpoS) strains were used to compare biofilm formation capacity and global gene expression.(More)
Biofilms gain resistance to various antimicrobial agents, and the presence of antibiotic resistance genes is thought to contribute to a biofilm-mediated antibiotic resistance. Here we showed the interplay between the tetracycline resistance efflux pump TetA(C) and the ampicillin resistance gene (bla(TEM-1)) in biofilms of Escherichia coli harboring pBR322(More)
Although importance of the rpoS gene on biofilm formation by Escherichia coli has been suggested, there has not been any report showing where the rpoS is expressed during biofilm formation process. Since physiological state of the cells in the biofilms is considerably heterogeneous, the expression of the rpoS gene must be heterogeneous. In this study, in(More)
The ecological role of horizontal gene transfer within biofilms has been recently investigated, and it has been reported that conjugation directly induces bacteria to form biofilms via expression of conjugative pili. In this report, we described the contribution of bacterial conjugation during biofilm formation by Escherichia coli harboring a natural IncF(More)
Biofilms are considered to be highly resistant to antimicrobial agents. Several mechanisms have been proposed to explain this high resistance of biofilms, including restricted penetration of antimicrobial agents into biofilms, slow growth owing to nutrient limitation, expression of genes involved in the general stress response, and emergence of a(More)
N-Octanoyl-L-homoserine lactone (C8-HSL) is an acyl-homoserine-lactone signal utilized in the quorum-sensing (QS) systems of Burkholderia cenocepacia and other bacterial species. Although also produced by Pseudomonas aeruginosa, its role in this species has not been elucidated. Here, we report that C8-HSL modulated antibiotic resistance and pyocyanin(More)
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