FIG. 2.

(Color online) Diagram of the interaction of a vibrating bubble with bacteria in ultrasound field. Following notations were introduced in the text and shown in the figure: xyz are Cartesian coordinates; θ is the zenith angle in the spherical coordinate system; a is the radius of the cell; R_o is the equilibrium radius of the bubble; L is the distance between center of the cell (O) and center of the bubble (Q); P is a point on the cell surface; R is the distance between center of the bubble and point P; k_o is the wave vector of the incident plane sound wave; c and η are sound velocity and viscosity of the corresponding liquids.