Hemolytic activitya |
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Strain | 15b | 18b | 37c | 41b | 195d | 198c | 199c | 201c | 203d |
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K
| 10.2 ± 2.6 | 8.7 ± 1.6 | 13.2 ± 3.8 | 20.7 ± 2.5 | 30.8 ± 1.2 | 20.3 ± 1.4 | 12.2 ± 0.6 | 21.5 ± 1.3 | 19.6 ± 1.1 |
PenG
| 20.4 ± 1.9** | 13.3 ± 0.3* | 32.5 ± 4.5** | 36.1 ± 1.9** | 54.8 ± 1.8 ** | 29.5 ± 1.7* | 33.9 ± 1.6** | 28.5 ± 1.7** | 55.5 ± 3.4** |
- a The hemolytic activity was measured for selected strains carrying promoter-hly fusions grown for 2 h in the presence (PenG) or absence (K) of penicillin G (0.03 μg/ml), using b0.5%, c1% or d2% suspensions of SRBC. The results are the average of three independent experiments, each performed in triplicate ± the standard deviation. Asterisks indicate significant differences according to Student’s t test (*, P < 0.05; **, P < 0.01).