Figure 2.

Influence of the shear stress on the adhesion of wild-type PA14 on glass. (A) Frequency of adhesion events recorded as a function of wall shear stress. (Dotted line) Best fit with an exponential function. OD₆₀₀ were renormalized to 0.2. Because small concentration variations could occur during the experiment, error bars were calculated assuming that OD₆₀₀ was known ±0.03. (B) Fraction of adhesion events surviving as a function of time, for three values of the shear stress (lin-log plot in inset). Fitting with a stretched exponential function (Eq. 4) gives the characteristic residence time τ. (C) Associated detachment rate coefficient as a function of residence time. Curves are obtained with a power-law model (Eq. 9) and the same fitting parameters as in plot B.