TABLE 2.

Diffusion coefficients estimated from analyses of swimming tracks in 10 strains of bacteriaa

StrainNo. of tumbles s−1τ (s)αuavg (μm s−1)umax (μm s−1)Davg (cm2 s−1)Dmax (cm2 s−1)
HP10.166.2−0.6721302.6 × 10−65.7 × 10−6
HP402226
HP50.09610.5−0.6726346.8 × 10−612 × 10−6
HP110.07614.9−0.67325116 × 10−638 × 10−6
HP1502937
HP25Nonmotile
HP330.482.07−0.6722301.0 × 10−61.9 × 10−6
HP390.333.05−0.6722281.4 × 10−62.4 × 10−6
HP43Nonmotile
HP462.060.40.4828560.4 × 10−61.4 × 10−6
  • a Tumbling frequencies, average run length (τ), turn angles (as α), and swimming velocities for 10 bacterial strains from analyses of swimming tracks. Two estimates of swimming velocity are provided, uavg, which is the overall average 2-D swimming velocity multiplied by 1.22, and umax, which is the average velocity that is sustained for long periods. A diffusion coefficient is computed for each of these velocities (Davg and Dmax, respectively).