TABLE 2.
Air sensitivity of P. gingivalis wild type (wt), oxyR mutant (oxyR), and complemented oxyR mutant (comp)
| Time of exposure to air (hours) | % CFUa
|
||
|---|---|---|---|
| wt | oxyR | Comp | |
| 1 | 97 ± 1 | 92 ± 2 | 96 ± 2 |
| 2.5 | 83 ± 3 | 64 ± 3 | 68 ± 3 |
| 5 | 59 ± 1 | 34 ± 1 | 42 ± 1 |
| 10 | 39 ± 3 | 4 ± 1 | 17 ± 4 |
| 20 | 34 ± 1 | <0.05 | 11 ± 3 |
| 25 | 16 ± 4 | <0.05 | 2 ± 3 |
a
Results represent the percentage of colony-forming units appearing on plates exposed to air compared to the control (time of exposure = 0 h) and are presented as the mean survival percentage ± standard deviation of duplicate experiments with duplicate samples per experiment.