Several biological materials are complex assemblies of semi-flexible filaments. They form out-of-equilibrium systems, driven by the consumption of chemical energy. Two lengthscales are usually considered to study the mechanics of these systems : the microscopic lengthscale (at the scale of single filaments) and the macroscopic lengthscale (at the material scale). The first is tackled using numerical simulations, while the second is addressed by continuum mechanics, e.g. active gels. However, bridges between the two representations are still lacking.
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