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Effect of pressure on general appearance of E. coli J1 by phase-contrast microscopy of exponential- and stationary-phase cells. (A) Untreated exponential-phase cells (100% viable cells); (B) untreated stationary-phase cells (100% viable cells); (C) exponential-phase cells treated with 300 MPa for 8 min (0.002% viable cells); (D) stationary-phase cells treated with 600 MPa for 8 min (0.01% viable cells). Bars, 2 μm.
