TABLE 1.
Acid resistance of L. lactis subsp. cremoris NCDO 712 at various stages of growth in batch cultures at several constant pHo values
| pHo | Growth rate (h−1)a | % Survival after a 2-h challenge at pHo 4.0
|
|
|---|---|---|---|
| Early-exponential-phase cellsb | Late-exponential-phase and early-stationary-phase cells | ||
| 7.0 | 1.06 | 0.18 | 27.75 |
| 6.5 | 0.98 | 0.35 | 75.40 |
| 6.0 | 0.68 | 14.77 | 92.72 |
| 5.5 | 0.52 | 91.89 | 100.00 |
a
Growth rate was determined as follows: (ln x2 − ln x1)/(t2 − t1).
b
The optical density at 580 nm was 0.1 to 0.2.