Table 1.

Activation of gene expression by conditioned medium

StrainGrowth conditionaMean β-galactosidase activity ± SD (Miller units)b
MT9LB262 ± 3
CM (wild type)3,466 ± 66 (13.2)
CM (tnaA::Cmr)2,526 ± 61 (9.6)
MT48LB39 ± 3
CM (wild type)341 ± 16 (9.0)
CM (tnaA::Cmr)200 ± 6 (5.3)
MT113LB177 ± 15
CM (wild type)1,500 ± 46 (8.5)
CM (tnaA::Cmr)464 ± 5 (2.6)
MT114LB39 ± 3
CM (wild type)405 ± 21 (10.4)
CM (tnaA::Cmr)302 ± 8 (7.7)
  • a CM, conditioned medium.

  • b Values in parentheses are fold induction relative to growth in LB only. Cells were harvested at anA600 of = 0.35.