Figure 5.

Typical shear force (F_s) versus time traces between two avidin-bHA-bearing surfaces across water. Trace A is the back and forth motion of the upper surface on top of the lower one at driving frequency of 0.25 Hz. Traces B–H are the shear forces recorded by the bending of the lateral springs at given pressures and surface separations. Bottom left inset: typical shear force F_s as a function of surface separation D. On the right is a schematic of two avidin-bHA-bearing surfaces shearing one on top of the other (see also earlier schematic for description of cartoon symbols).