Fig. 3. (a) Number of adhered cells per unit area 60 s after dropping the suspension of three E. coli strains on the nanostructured surfaces. Gray, red and blue bars represent E. coli strains, RP437 (WT), RP437 fliC (absence of flagella), and RP6894 (presence of flagella but deficit of motility), respectively. Each data shows the average (N = 3) with error bars. (b) Number of adhered cells per unit area 60 min after dropping the suspension of two E. coli strains on the nanostructured surfaces. Gray and patterned bars represent E. coli strains, RP437 and UU2612 (absence of chemotaxis), respectively. Each data shows the average (N = 3) with error bars.