The 9th Symposium on Analytical Ultracentrifugation (AUC) which was held at the Max Delbrück
Center for Molecular Medicine in Berlin-Buch March 1995 is the basis of this volume. It
presents an actual survey of recent developments and results of ultracentrifugation methods in
the frame of the following topics: Reversible Association Reactions.- Analysis of
Supramolecular Structures Including Modeling.- Size Distribution Analysis and Gel Formation.-
Hardware and Software Developments.