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• W1975598597 abstract "Buckling is often regarding as a form of mechanical failure to be avoided. High-speed video microscopy and mechanical stability theory now show, however, that bacteria use such processes to their advantage. Cells propelled with a single flagellum change direction with a flick-like motion that exploits a buckling instability. Bacteria swim by rotating rigid helical flagella and periodically reorienting to follow environmental cues1,2. Despite the crucial role of reorientations, their underlying mechanism has remained unknown for most uni-flagellated bacteria3,4. Here, we report that uni-flagellated bacteria turn by exploiting a finely tuned buckling instability of their hook, the 100-nm-long structure at the base of their flagellar filament5. Combining high-speed video microscopy and mechanical stability theory, we demonstrate that reorientations occur 10 ms after the onset of forward swimming, when the hook undergoes compression, and that the associated hydrodynamic load triggers the buckling of the hook. Reducing the load on the hook below the buckling threshold by decreasing the swimming speed results in the suppression of reorientations, consistent with the critical nature of buckling. The mechanism of turning by buckling represents one of the smallest examples in nature of a biological function stemming from controlled mechanical failure6 and reveals a new role for flexibility in biological materials, which may inspire new microrobotic solutions in medicine and engineering7." @default.
• W1975598597 created "2016-06-24" @default.
• W1975598597 creator A5018606584 @default.
• W1975598597 creator A5019172915 @default.
• W1975598597 creator A5073526458 @default.
• W1975598597 date "2013-07-07" @default.
• W1975598597 modified "2023-10-14" @default.
• W1975598597 title "Bacteria can exploit a flagellar buckling instability to change direction" @default.
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• W1975598597 doi "https://doi.org/10.1038/nphys2676" @default.
• W1975598597 hasPublicationYear "2013" @default.
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