(A) Position of 0.46 µm diameter particles relative to the areolar ridge. Similar results have been obtained for 0.05 to 2 µm particles. (B) Lateral deflection of 0.46 µm beads as a fraction of forward flow in a diatom. Adapted with permission from ref. 12. Copyright 2001 American Chemical Society. (C) Map view of a diatom surface in 50 µm s−1 flow. The degrees of deflection are around the edge and the proportion of particles for the diatom (white) and glass slide (black) were normalised to the maximum particle bin for each. Adapted with permission from ref. 14. Copyright 2002 American Chemical Society. Bin size was 10 degrees of deflection. Minimum of 30 particles per point in (A), (B) and (C). Error bars are 95% confidence intervals.