TABLE 2.

Quantitative summary of low-pH-induced changes in H. pylori gene expressiona

pH5 mM ureaNo. (%) of genesb:
Up-regulatedDown-regulated
6.2Yes13 (0.8)7 (0.5)
6.2No28 (1.8)32 (2.1)
5.5Yes36 (2.3)22 (1.4)
5.5No87 (5.7)80 (5.2)
4.5Yes10 (6.6)53 (3.5)
4.5No187 (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.