Hybrid description of complex molecules

We present a hybrid description of complex molecules in which one of the molecules is described in full atomistic detail, while the rest of molecules is represented at a coarse-grained level with their centers-of-mass variables. Based on Zwanzig's projection method, we derive the equations of motion for the coupled detailed/coarse-grained system, which turn out to be of the form of Dissipative Particle Dynamics. Copyright (C) EPLA, 2009