Appendix 1—figure 2. Comparison of various force dependencies of the pilus detachment rate constant k_off as indicated in the legend.

(b) Comparison of bacterial velocities obtained by models with various complexity with experimentally measured values (local velocity analysis) as indicated in the legend (parameters were fit w.r.t experimental mean values). The model parameters for the force-independent model are as in Appendix 1—figure 1a. For the slip and catch bond model the fixed parameters are $E_0=32$ kPa,,${\tilde{F}}_{\mathrm{S}}=1.1$ $\epsilon =2$ (catch bond), ${\tilde{F}}_{\mathrm{C}}=0.1$ (catch bond). For the slip and catch bond model $V_{\max }$ was estimated from least square fits: ${\displaystyle V_{\mathrm{m}\mathrm{a}\mathrm{x}}=0.98}$ μm.min^-1 (slip) and ${\displaystyle V_{\mathrm{m}\mathrm{a}\mathrm{x}}=1.15}$ μm.min^-1 (catch). Error estimates are expected to be of the same order of magnitude as for the force independent model (see Appendix 1—figure 1a).