Amplified effect of Brownian motion in bacterial near-surface swimming Export

@article{citeulike:3812784, abstract = {10.1073/pnas.0807305105 Brownian motion influences bacterial swimming by randomizing displacement and direction. Here, we report that the influence of Brownian motion is amplified when it is coupled to hydrodynamic interaction. We examine swimming trajectories of the singly flagellated bacterium near a glass surface with total internal reflection fluorescence microscopy and observe large fluctuations over time in the distance of the cell from the solid surface caused by Brownian motion. The observation is compared with computer simulation based on analysis of relevant physical factors, including electrostatics, van der Waals force, hydrodynamics, and Brownian motion. The simulation reproduces the experimental findings and reveals contribution from fluctuations of the cell orientation beyond the resolution of present observation. Coupled with hydrodynamic interaction between the bacterium and the boundary surface, the fluctuations in distance and orientation subsequently lead to variation of the swimming speed and local radius of curvature of swimming trajectory. These results shed light on the fundamental roles of Brownian motion in microbial motility, nutrient uptake, and adhesion.}, author = {Li, Guanglai and Tam, Lick-Kong and Tang, Jay X.}, citeulike-article-id = {3812784}, citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.0807305105}, citeulike-linkout-1 = {http://www.pnas.org/content/105/47/18355.short.abstract}, citeulike-linkout-2 = {http://www.pnas.org/content/105/47/18355.short.full.pdf}, citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/19015518}, citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=19015518}, day = {25}, doi = {10.1073/pnas.0807305105}, journal = {Proceedings of the National Academy of Sciences}, keywords = {bacteria, brownian, dark-field, microswimmers, motion, surface, tirf}, month = {November}, number = {47}, pages = {18355--18359}, posted-at = {2008-12-19 21:41:01}, priority = {2}, title = {Amplified effect of Brownian motion in bacterial near-surface swimming}, url = {http://dx.doi.org/10.1073/pnas.0807305105}, volume = {105}, year = {2008} }

TY - JOUR ID - citeulike:3812784 L3 - citeulike-article-id:3812784 N2 - 10.1073/pnas.0807305105 Brownian motion influences bacterial swimming by randomizing displacement and direction. Here, we report that the influence of Brownian motion is amplified when it is coupled to hydrodynamic interaction. We examine swimming trajectories of the singly flagellated bacterium near a glass surface with total internal reflection fluorescence microscopy and observe large fluctuations over time in the distance of the cell from the solid surface caused by Brownian motion. The observation is compared with computer simulation based on analysis of relevant physical factors, including electrostatics, van der Waals force, hydrodynamics, and Brownian motion. The simulation reproduces the experimental findings and reveals contribution from fluctuations of the cell orientation beyond the resolution of present observation. Coupled with hydrodynamic interaction between the bacterium and the boundary surface, the fluctuations in distance and orientation subsequently lead to variation of the swimming speed and local radius of curvature of swimming trajectory. These results shed light on the fundamental roles of Brownian motion in microbial motility, nutrient uptake, and adhesion. IS - 47 JF - Proceedings of the National Academy of Sciences EP - 18359 TI - Amplified effect of Brownian motion in bacterial near-surface swimming VL - 105 SP - 18355 KW - bacteria KW - brownian KW - dark-field KW - microswimmers KW - motion KW - surface KW - tirf AU - Li, Guanglai AU - Tam, Lick-Kong AU - Tang, Jay PY - 2008/11/25/ UR - http://dx.doi.org/10.1073/pnas.0807305105 ER -