Like inanimate matter, biological matter is condensed, though it may be more complex. However, a living cell is a chemically open system with biological functions that are often a non-stationary, non-linear type of collective phenomena driven by chemical reactants, for example ATP, GTP, ligands and receptors. The living cell and many of its subsystems are hence lyotropic systems, depending on various reactant concentrations rather than the temperature. Non-local and local correlations of the interacting molecules become the prerequisites for signal transduction. This book constitutes the proceedings of the workshop entitled "Biological Physics 2000".