Rod shaped bacteria under hydrostatic pressure load, observed from a perspective of an isotropic material, deform rather unusually, with the expected reduction of cylindrical diameter their length increases. In this work we assumed, that the reason for this is in the anisotropic structure of the cell wall of the bacterium. We set up a model of the bacterium as a thin-walled cylinder formed from a homogeneous, transversely isotropic material, with the symmetry axis in the direction of the fibrous structure within the cell wall. We then derived the deformation equations for this model. We analysed these equations and found out that we get the desired deformation state only for a specific combination of the base parameters. With this research we gained an appropriate model, that can describe the deformation of bacteria and is simple from the perspective of understanding it as well as actual computation of the deformation.
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