TABLE 1.
Bacterial strains and their catalase activities
| Strain | Genotype and/or phenotype | Source | Catalase (min)a |
|---|---|---|---|
| MP180 | HfrH thi | Loewen | 2.5 |
| UM202 | HfrH thi katG::Tn10 | Loewen | >10 |
| JTG100 | btuB::Tn10 | Demple | 6.1 |
| JTG101 | TetsoxyRΔ | Demple | 6.2 |
| JTG314 | TetsoxyRΔ, overproduces KatG | Demple | 0.5 |
| GC4468 | Δlac U169rpsL | Schellhorn | 2.2, 0.9 |
| GC202 | Same as GC4468 but katG17::Tn10 | Schellhorn | 2.4, 1.7 |
| NC4468 | Same as GC4468 but Φ(katE::lacZ+)131 | Schellhorn | 1.4, 1.1 |
| NC202 | Same as GC4468 but Φ(katE::lacZ+)131 katG17::Tn10 | Schellhorn | >10, >10 |
| Bacillus subtilis PY79 | Prototroph, SPβ−, tetracycline resistant | Youngman | 0.53 |
| Streptomyces venezuelae | Prototroph | Westpheling | 3.9 |
a
The shorter the time, the greater the activity (see Materials and Methods). For the Schellhorn strains, the first number is the activity immediately before exposure to Hg(0) and the second is the activity after 90 min of exposure to Hg(0).