This volume covers some powerful biophysical methods, such as analytical centrifugation, mass spectrometry, fluorescence spectroscopy, electron spin resonance and nuclear magnetic resonance, for the study of complex biological structures, and discusses useful physical concepts as applied to biological and biochemical systems. Case-orientated studies concentrating on particular methodologies are presented and examples are given, addressing some of the most important aspects of structure-function relationship in biological assemblies. Biophysics nowadays collaborates closely with molecular biology and bioinformatics and this is also demonstrated in this book. The book will be of interest both to experienced researchers wishing to widen their insight into molecular structure and function, and to younger scientists at the doctoral and postdoctoral level interested in the molecular nature of fundamental biological entities and phenomena.