Biological Physics at PKS focuses on the description of biological systems at cellular and sub-cellular scales. The aim is to develop concepts that will be helpful for improving our understanding of the principles that govern the organization of cellular processes. To this end methods from the statistical physics of systems out of the thermodynamic equilibrium and non-linear dynamics are used and developed further. An important part of our work are close collaborations with experimental groups, in particular, from the MPI for Molecular Cell Biology and Genetics, Dresden.