Fig. 7. The captured image (A) and processed image (B) of sperm diffusing in 250 nmol l^–1 resact solution. The sperm sample was prepared by mixing 10 µl dry sperm with 200 µl 250 nmol l^–1 resact solution. (C) The sperm concentration profile along the length of the channel and the D value estimation by curve-fitting Eqn 6. Scale bars, 500 µm.