Browsing by Author "Wang, Jing-Hui"

Now showing 1 - 1 of 1

Collective flow dynamics across a bacterial carpet: Understanding the forces generated
(2014-11-17)
Hsiao, Yi-Teng
;
Wang, Jing-Hui
;
Wu, Kuan-Ting
;
Tsai, Jengjan
;
Chang, Cheng-Hung
Bacterial carpets consist of randomly anchored uni-polar-flagellated sodium-motive bacterial matrix are prepared by flow deposition. Collective flow dynamics across the bacterial carpets are probed with optical tweezers-microsphere assay. Around the center of a uniform bacterial cluster, collective forces that pull microsphere towards carpet surface are detected at a distance of 10 mu m away from carpets. At sodium-motive driving over a critical value, the force magnitudes increase abruptly, suggesting a threshold-like transition of hydrodynamic synchronization across bacterial carpet. The abrupt force increase is explained in term of bifurcation to phase synchronization in a noisy non-linearly coupled rotor array mediated by hydrodynamic interactions. (C) 2014 AIP Publishing LLC.