べん毛による細菌運動の解析

概要

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A method is proposed for analyzing the swimming motions of bacteria. It is assumed that bacteria consist of a spherical cell body and several rotating flagella. The forces and torques exerted on each flagellum are evaluated in a coordinate system fixed with respect to the flagellum using the resistive force theory. They are transformed into a coordinate system fixed with respect to the cell body. Then, the velocity and angular velocity of the cell body are determined by assuming the condition that the net force and torque on the bacterium are zero. This method is applicable to the motion of bacteria with rotating flagella in any form of curve and attached to any point on the cell body. A numerical example shows that the trajectory of bacteria with a flagellum slanting from the radial direction of the cell body is a double helix, and the mean velocity of the bacteria depends slightly on the slant angle. Another example shows that bacteria with two flagella attached symmetrically to the center of the cell body and rotating in opposite directions swim faster than single flagellate bacteria.
一般社団法人日本機械学会の論文
1997-02-25