TABLE 2.
Quantitative summary of low-pH-induced changes in H. pylori gene expressiona
| pH | 5 mM urea | No. (%) of genesb:
|
|
|---|---|---|---|
| Up-regulated | Down-regulated | ||
| 6.2 | Yes | 13 (0.8) | 7 (0.5) |
| 6.2 | No | 28 (1.8) | 32 (2.1) |
| 5.5 | Yes | 36 (2.3) | 22 (1.4) |
| 5.5 | No | 87 (5.7) | 80 (5.2) |
| 4.5 | Yes | 10 (6.6) | 53 (3.5) |
| 4.5 | No | 187 (12.2) | 113 (7.0) |
a
Almost all of 1,534 ORFs on the array were detectable with intensities above background level in all the experiments.
b
The percentages in the table are percentages of the 1,534 ORFs on the array.