Bacteria can exploit a flagellar buckling instability to change direction

By K. Son, J. Guasto, Roman Stocker. Nature Physics, 2013

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Physics of microswimmers—single particle motion and collective behavior: a review (2014, background): “, Vibrio alginolyticus, tumble by motion reversal and by exploition of a buckling instability of their hook (Son et al., 2013).”
Bacterial hydrodynamics (2015, background): “However, the propulsive forcing from the fluid on the flagellar filament, which is transmitted to the flexible hook, is able to induce buckling of the hook which leads to a random reorientation of the cell, thereby escaping the reversibility argument (Son et al., 2013; Xie et al., 2011).”
A crawling robot driven by multi-stable origami (2017, background): “be a dominant feature of locomotion for uni-flagellated bacteria, suggesting that the bi-stable actuation scheme is viable independent of scale [2].”