Abstract
Abstract Through recent advances in instrumentation, neutrons access the hierarchy of molecular dynamics of biological macromolecules with unprecedented precision. It has for instance become possible to separate and quantitatively describe the superposition of the translational and rotational center-of-mass diffusion of proteins in aqueous solutions as well as the internal diffusive motions of protein side-chains on nanosecond to picosecond time scales. An increasing number of questions concerning the dynamics of biological systems can be addressed by neutron spectroscopy. Current topics include, among others, the diffusive dynamics in crowded media, the formation of both static and dynamic protein clusters, the fluctuations of biological membranes, the effect of pressure and temperature on living systems, as well as aggregation and self-assembly phenomena, and biological fibers. Along with the progress in the experimental methods, new data analysis frameworks and more accurate models are being employed, and theoretical predictions for instance from colloid physics are being tested. This chapter on the dynamics of biological systems complements the preceding chapter on biological structures.
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