TABLE 4.
Changes in pH during the growth of E. coli O157:H7 ATCC 35150, ATCC 43889, and ATCC 43895 under LSMMG and NG conditions in M9 minimal medium containing 0.4% glucose
| Time (h) | pHa |
|||||
|---|---|---|---|---|---|---|
| ATCC 35150 |
ATCC 43889 |
ATCC 43895 |
||||
| LSMMG | NG | LSMMG | NG | LSMMG | NG | |
| 0 | 7.06 ± 0.01 A | 7.06 ± 0.01 A | 7.04 ± 0.01 A | 7.04 ± 0.01 A | 7.01 ± 0 A | 7.01 ± 0 A |
| 3 | 7.07 ± 0.01 A | 7.06 ± 0.01 A | 7.02 ± 0.01 A | 7.02 ± 0.02 A | 7.02 ± 0.02 A | 7.00 ± 0.03 A |
| 6 | 6.90 ± 0.07 A | 6.90 ± 0.02 A | 6.83 ± 0.01 B | 6.84 ± 0.03 A | 6.97 ± 0.01 AE | 7.02 ± 0.02 AF |
| 12 | 5.52 ± 0.32 B | 5.45 ± 0.17 B | 5.49 ± 0.11 C | 5.60 ± 0.11 B | 5.88 ± 0.13 B | 5.94 ± 0.33 B |
| 24 | 5.11 ± 0.03 CE | 5.38 ± 0.11 BF | 5.22 ± 0.02 DE | 5.54 ± 0.12 BF | 5.50 ± 0.03 CE | 5.67 ± 0.06 BF |
| 48 | 5.30 ± 0.03 BC | 5.45 ± 0.11 B | 5.47 ± 0.01 CE | 5.70 ± 0.15 BF | 5.72 ± 0.06 B | 5.81 ± 0.11 B |
a
Means ± SD; n = 3 samples for each gravity condition. A to D, values in the same column are significantly different (P < 0.05); E and F, values in the same row for each strain are significantly different (P < 0.05).