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Adaptive responses greatly improve the competitive capacities of bacteria in diverse environments. Here, we investigate whether bacteria can adapt to a microenvironment with distinctive softness by examining the type-IV pili (TFP)-mediated motility of Pseudomonas aeruginosa cells on brush-like surfaces that are grafted with a layer of thermally sensitive polymer chains, where the softness of the brush-layer is tunable by applying a small temperature change (from 30 to 37°C). We report that P.doi:10.1038/ncomms6541 pmid:25412641 pmcid:PMC4263163 fatcat:6bqiibl6endc7ktkbmh5y6rxmq