This compact book builds on a two-semester lecture entitled given at the Technical University of Munich. To emphasize different approaches and thus make them more comprehensible, important formulas are often derived in different ways. "By the way" sections, highlighting historical or current backgrounds and the scientific zeitgeist of the respective research, enrich the material in an entertaining way. Attractive, clear and modern illustrations give the book a special charm in addition to the technically up-to-date and comprehensibly presented content.  From the contents: - Active movement and enzyme kinetics: functioning of enzymes, molecular motors and the dynamics of fibre proteins in the cytoskeletonweiterlesen