Collective flow dynamics across a bacterial carpet: Understanding the forces generated

Yi Teng Hsiao, Jing Hui Wang, Kuan Ting Wu, Jengjan Tsai, Cheng-Hung Chang, Wei Yen Woon*

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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 lm 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 nonlinearly coupled rotor array mediated by hydrodynamic interactions.

Original languageEnglish
Article number203702
JournalApplied Physics Letters
Volume105
Issue number20
DOIs
StatePublished - 17 Nov 2014

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