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Table 1 Expression of promoter- hly fusions in response to the addition of penicillin G as determined by a hemolytic activity assay

From: Identification of a ferritin-like protein of Listeria monocytogenesas a mediator of β-lactam tolerance and innate resistance to cephalosporins

Hemolytic activitya
Strain 15b 18b 37c 41b 195d 198c 199c 201c 203d
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**
  1. 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).