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. 2010 Aug 10;5(8):e12097. doi: 10.1371/journal.pone.0012097

Figure 3. Inner cell structure and forces.

Figure 3

The mechanical properties of the cytoskeleton are modeled using Voigt subunits; the spring constants of the model are linear approximations to the elasticity of the inner cell. All springs can be considered subject to a damping force due to the viscosity of the cytoplasm, where linear dash-pots are used to approximate the viscosity of the cytoskeleton. In our model, the cytoskeleton is divided into Inline graphic uniformly radial distributed parts, each of which is replaced by a Voigt subunit radiating from the nucleus (blue subunits). Each subunit connects two points of the cell and nuclear membrane, which are located at a radial direction from the center of the nucleus. The model also contains Inline graphic Voigt subunits in the nucleus (red subunits), each of which connect two nuclear membrane points Inline graphic and Inline graphic in which Inline graphic equal to Inline graphic, This allows the nucleus to show more resistance to changes in its shape and volume due to exterior pressure. Inline graphic is the cytoskeletal force acting on Inline graphic and is calculated by Eq. (3). Inline graphic is the force acting on Inline graphic from the cytoskeleton and nuclear cytoskeleton and is calculated by Eq. (4).