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. 2019 Apr 4;9(19):10606–10624. doi: 10.1039/c9ra00648f

Structural parameters used to evaluate the microstructure of apple tissue.

Structural parameter Unit Description
Radial shrinkage Ratio of the difference between the sample initial radius (8 mm) and the equivalent radius of slice i at time t (Eulerian configuration) to the sample initial radius
Axial shrinkage Ratio of the difference between the sample initial height (8 mm) and the height of slice i at time t (Eulerian configuration) to the sample initial height
Eulerian porosity Ratio of the pore volume of slice i in the Eulerian configuration, to the total volume (pores and cells) of the slice i also in the Eulerian configuration (Fig. 3a)
Lagrangian porosity Ratio of the pore volume in slice i in the Lagrangian configuration, to the total volume (pores and cells) of the slice i in the initial configuration (Fig. 3a)
Lagrangian cell fraction Ratio of the cell volume in slice i in the Lagrangian configuration, to the total volume (pores and cells) of the slice i in the initial configuration (Fig. 3a)
Cell sphericity A measure of how spherical an object (a cell) is. It is defined as the ratio of the surface area of a sphere (Asphere) with the same volume as the cell (Vcell) to the measured surface area of the cell (Acell)
Cell equivalent diameter μm Diameter of a sphere that has the same volume as the cell
Cell length μm Maximum Ferret diameter DF,max of a cell. The Feret diameter is the normal distance between two parallel tangent planes touching the particle surface.51 The maximum Feret diameter was determined by sampling over 31 angles
Cell elongation Ratio of the maximum Ferret diameter DF,max to the smallest Ferret diameter DF,min orthogonal to it, as illustrated in Fig. 3c
Pore equivalent diameter μm Diameter of a sphere that has the same volume as the pore