TABLE 2.
Measures of pH tactic behavior of H. pylori strains and tlp mutantsa
| Strain | Acid (+/−) | Swimming pattern (random or arc) | Linear velocity (μm/s) | Mean arc radius (μm) |
|---|---|---|---|---|
| SS1 (5) | − | Random | 11.4 ± 1.7 | None |
| SS1 (5) | + | Arc | 14.1 ± 1.4 | 3.53 ± 0.49 |
| tlpD (5) | − | Arc/tumble | 17.8 ± 1.6 | None |
| tlpD (5) | + | Arc/tumble | 9.3 ± 2.6 | 2.67 ± 0.71 |
| tlpB (5) | − | Random | 13.6 ± 1.8 | None |
| tlpB (5) | + | Random | 16.3 ± 2.9 | None |
| tlpC (5) | − | Random | 57.4 ± 4.5 | Linear |
| tlpC (5) | + | Linear/arc | No change | ND |
a
Helicobacter pylori strain SS1 and mutants were exposed to HCl (+/−) 0.1 N, and five individual bacteria were tracked for tactic behavior. Random, absence of tactic behavior with bacteria displaying mostly linear swimming, but arcing and tumbling are also observed in the population; arc, much of the population is engaged in this behavior. The radius of the recorded arcs for each bacterium was computed and the mean and standard deviation are presented. ND, not determined.