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Selective enrichment of two independent cultures of E. coli DVL20 toward increased HHP resistance at 800 MPa (20°C). The two axenic cultures were iteratively exposed to HHP shocks of 800 MPa (15 min, 20°C), with intermittent resuscitation and growth. Line graphs (----△---- and 
) present the inactivation after each HHP shock and are expressed as log(N0/N).
