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β-Lactamase activities of E. coli strains
| Strain | Relative β-lactamase activity (U/mg of protein)a
|
|
|---|---|---|
| Noninduced | Inducedb | |
| KU6400 | 7.7 | 7.9 |
| ML4947(pKU601) | 10.9 | 11.1 |
| ML4953(pKU601) | 14.4 | 16.3 |
| ML4947(pKU611) | 1.4 | 1.7 |
| ML4947(pKU612) | 0.2 | NDc |
β-Lactamase activities are the geometric mean determinations for three independent cultures. The standard deviations were within 10%.
Cefoxitin (10 μg/ml); was used as the inducer.
ND, not done.
