Interfacial flow around a pusher bacterium
Interfacial flow around a pusher bacterium
复制标题
推杆细菌周围的界面流
DOI:
10.1017/jfm.2023.905
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发表时间:
2023
影响因子:
3.7
通讯作者:
Stebe, Kathleen J.
中科院分区:
文献类型:
--
作者:
Deng, Jiayi;Molaei, Mehdi;Chisholm, Nicholas G.;Stebe, Kathleen J.
Motile bacteria play essential roles in biology that rely on their dynamic behaviours, including their ability to navigate, interact and self-organize. However, bacteria dynamics on fluid interfaces are not well understood. Swimmers adsorbed on fluid interfaces remain highly motile, and fluid interfaces are highly non-ideal domains that alter swimming behaviour. To understand these effects, we study flow fields generated by Pseudomonas aeruginosa PA01 in the pusher mode. Analysis of correlated displacements of tracers and bacteria reveals dipolar flow fields with unexpected asymmetries that differ significantly from their counterparts in bulk fluids. We decompose the flow field into fundamental hydrodynamic modes for swimmers in incompressible fluid interfaces. We find an expected force-doublet mode corresponding to propulsion and drag at the interface plane, and a second dipolar mode, associated with forces exerted by the flagellum on the cell body in the aqueous phase that are countered by Marangoni stresses in the interface. The balance of these modes depends on the bacteria's trapped interfacial configurations. Understanding these flows is broadly important in nature and in the design of biomimetic swimmers.
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