Amount of intracellular ATP in L. plantarum LA 10-11 cells grown at pH 5.0 (A) and pH 7.0 (B) after different durations of pressure treatment at 250 MPa. Symbols: □, 0 min; ⧫, 5 min, survival 57% (A); ▴, 10 min, survival 99% (A); ▪, 20 min, survival 41% (A) and 56% (B); ▿, 40 min, survival 55% (A); •, 80 min, survival 0.4% (A). The percent survival is calculated by [N (number of cells after pressure)/N (number of cells before pressure)] × 100.