Fig. 7. Response of cells of Lingulodinium polyedrum injected at the nozzle inlet at various radial positions for Re=2500. A radial injection position of 1 is at the inlet wall (=Y_in) while a value of zero is at centerline. Symbols represent mean values ± S.D. (A) Proportion of cells responding, based on approximately 7 cells injected s^-1; cells injected at <0.6Y_in did not respond. All stimulated cells were located downstream within the thin wall boundary layer. (B) Relative fluid shear stress and acceleration at the position of stimulated cells (X₀, Y₀).