Figure 2.

Correlation analysis of the switching between two motors. (A) The time courses of the rotational speeds of motor 1 (red), 2 (blue), and 3 (green), which are depicted in Fig. 1B. The plus and minus values represent CCW and CW rotations, respectively. (B) Correlation analyses between motors 1 and 2 (blue line), and between motors 1 and 3 (green line), which are depicted in Fig. 2A. Analyses were made based on motor 1. Correlations (Z (τ)) were calculated (−1 ≦ Z ≦ 1) using Eq. 1 (see Materials and Methods). (C) Gray lines indicate an individual correlation analysis for cells (64 cells) and red line indicates the average trace of the correlation analyses from these cells. (D) Correlation of data measured for 10 min (red line) and the 1 min-subsets (gray lines) for a single E. coli cell.