TABLE 1.
Activation of gene expression by conditioned medium
| Strain | Growth conditiona | Mean β-galactosidase activity ± SD (Miller units)b |
|---|---|---|
| MT9 | LB | 262 ± 3 |
| CM (wild type) | 3,466 ± 66 (13.2) | |
| CM (tnaA::Cmr) | 2,526 ± 61 (9.6) | |
| MT48 | LB | 39 ± 3 |
| CM (wild type) | 341 ± 16 (9.0) | |
| CM (tnaA::Cmr) | 200 ± 6 (5.3) | |
| MT113 | LB | 177 ± 15 |
| CM (wild type) | 1,500 ± 46 (8.5) | |
| CM (tnaA::Cmr) | 464 ± 5 (2.6) | |
| MT114 | LB | 39 ± 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 an A600 of = 0.35.