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Inactivation of isolated H-19B (▪) and 933W (▴) phage particles by pressure treatment (0 to 500 MPa, 15 min, 20°C), as determined by infectivity upon plating on C600. Untreated (0-MPa) phage titers correspond to ca. 2.3 × 107 and 3.8 × 107 PFU/ml for H-19B and 933W, respectively. Open symbols represent counts below the detection limit. The results are expressed as means ± the standard deviations of three experiments.
