2P1-A24 Relationship between the dimensions and the velocities of a single-flagellated bacterium swimming close to a rigid boundary

Abstract

Bacteria swimming close to a rigid boundary o 丘 毛 cn trace circular trajectoI ・ ies． An E ． Coli cell ， which utilizes a bundle of severa 田 agella as a screw ， swims clockwise above a boundary when it is observed Erom above ． In colltrast ， a Vibrio cell ， whicll possesses a single flagellunll swims coullterclockwise ill a way that the flagcllum pulls the cell body ． Also ， the swimmillg speed of them are affected by the boundary ． In this study ， the velocities and anglllar velocities of bacterium models swimminig dose to a rigid boundary are calculated by use of the boundary elcment analysis ， They are compared to those of models swimming illEree space ， The degree of fiuid dynamic illtcractions ， between the cell body and the boundary ， and between the flagellurn and the boundary is crucial to explain the variety of motions f bacteria swimlnillg close to aboundary ．