Figure 4.

A and B, O₂ and CO₂ partial pressure distribution in a vertical slice along the vertical axis of the fruit stored at 20 kPa O₂, 0 kPa CO₂, and 20°C. The macroscale model was used for the computation. Color bars indicate the gas partial pressure (kPa). C, O₂ and CO₂ concentrations as a function of time in a closed jar containing a Jonagold apple. The dashed lines and solid line indicate the computed O₂ and CO₂ partial pressures in the jar, respectively; crosses and circles indicate the measured O₂ and CO₂ gas partial pressures for initial conditions equal to 20 kPa O₂, 0 kPa CO₂, and 10°C. The dashed-dotted lines and plus symbols indicate the simulated and measured CO₂ gas partial pressures in the jar, respectively, for initial conditions equal to 0 kPa O₂, 0 kPa CO₂, and10°C. For both sets of initial conditions, three experiments with different fruit were carried out and simulated. D, Radial O₂ partial pressure profile in cortex tissue from the center to the boundary of the fruit (r = 38.6 mm). The O₂ and CO₂ concentrations of the external atmosphere were equal to 20 and 0 kPa CO₂, respectively, and the temperature was 20°C.