FIGURE 1.

The model of a spherical cell with a concentric spherical organelle. The model consists of five regions, each characterized by an electric conductivity (σ, in S/m) and a dielectric permittivity (ɛ, in As/Vm). From the center outwards, the regions are the organelle interior (subscript index “1i”), the organelle membrane (“1m”), the cytosol (“2i”), the cell plasma membrane (“2m”), and the cell exterior (“e”). The organelle radius and the cell radius are denoted by R₁ and R₂, respectively, and their membrane thicknesses by d₁ and d₂, respectively.