FIGURE 13.

Actin density near the surface of the bacterium is a better predictor of bacterial speed than density in the tail region. (A) Maps of normalized χ² error from a linear estimator are plotted for representative bacteria, with numbers as in previous figures. White represents χ² = 1, and black represents χ² = 0.93. In this calculation 10 s of previous history were included (n_r = 5). Bacteria are centered and oriented as in previous figures. (B) Population average map of χ² values for 7902 bacteria. Longitudinal cross-section is indicated by black lines. (C) χ² values along longitudinal cross-section, for n_r = 1 to n_r = 5 indicated by the darkness of the traces. (D) Corresponding normalized actin (dotted line) and tracking channel (solid line) profile.