TABLE 3.
Generation times of S. salivarius ATCC 25975 and mutant G71
| Sugar | Concn (mM) | Mean generation timea (min) ± SE
|
|
|---|---|---|---|
| Parental strain | Mutant G71 | ||
| Lactose | 5.8 | 29 ± 1 | 28 ± 1 |
| Lactose | 29 | 28 ± 2 | 30 ± 2 |
| Galactose | 11 | 30 ± 1 | 36 ± 2 |
| Galactose | 55 | 32 ± 1 | 40 ± 3 |
a
Growth was monitored by determining the optical density at 660 nm. Generation times were calculated for cultures in the exponential growth phase by plotting the logarithm of the optical density at 660 nm as a function of time. Values represent the means of eight separate experiments.