Figure 4.
Young's modulus (a) and hardness (b) depend on indentation depth at different locations (different curves). Residual plastic deformation (c) is demonstrated as a shift of an indentation curve (dotted curve) after application of 2.13 kPa of average stress to the biofilm. Indentation curve, while applying stress of 2.13 kPa, is plotted as a solid line.