TABLE 2.

Fractions retained measured for wild-type, tumbly, smooth-swimming, and paralyzed E. coli strains to a glass surface in the parallel-plate flow chamber

E. coli cell type	Mean fraction retained ± SDa at:
	0.0044 cm s−1 at:		0.044 cm s−1 at:
	I = 0.2 M	I = 0.02 M	I = 0.2 M	I = 0.02 M
Wild-type	0.47 ± 0.09b	0.43 ± 0.18	0.70 ± 0.08b	0.82 ± 0.09
Paralyzed	0.75 ± 0.02b	0.78 ± 0.1∗	0.45 ± 0.07b∗	0.74 ± 0.08c
Smooth swimming	0.21 ± 0.04∗	0.14 ± 0.007	0.15 ± 0.04∗	-∗
Tumbly	0.62 ± 0.04c	-∗	0.65 ± 0.12c	-∗

^a-, No attached cells were observed on the glass surface during the experiment (∼1.5 h), and therefore a fraction retained could not be determined. ∗, Statistically different than the wild type (for the same conditions). I, ionic strength.

^bData for wild-type and paralyzed E. coli strains in 0.2 M buffer are from McClaine and Ford (26).

^cWe report a fraction retained, but note that the number of cells that attached during experiments ranged between 8 and 15 cells per field (and thus the number of detached cells was small). In typical experiments, the number of cells per field is between 60 and 80.