The <i>Advances in Chemical Physics</i> series provides the chemical physics field with a forum for critical, authoritative evaluations of advances in every area of the discipline. This volume explores the following topics: <ul> <li>Thermodynamic Perturbation Theory for Associating Molecules</li> <li>Path Integrals and Effective Potentials in the Study of Monatomic Fluids at Equilibrium</li> <li>Sponteneous Symmetry Breaking in Matter Induced by Degeneracies and Pseudogeneracies</li> <li>Mean-Field Electrostatics Beyond the Point-Charge Description</li> <li>First Passage Processes in Cellular Biology</li> <li>Theoretical Modeling of Vibrational Spectra and Proton Tunneling in Hydroen-Bonded Systems</li> </ul>