Figure 2.

The diffusion coefficient D (in units of μm²s⁻¹), as given by Eq. 7, as a function of ω (in units of s⁻¹) and a (in units of μm) for fixed v = 30 μms⁻¹ and α = 1/3. For free diffusion in bulk fluid, bacterial diffusion constants are ∼200 to 1900 μm²s⁻¹ (25, 52).