Polyelectrolyte: Thermodynamics and Rheology -- Structure and Thermodynamics of Polyelectrolyte Complexes -- Polyelectrolyte: Science and Application -- Biological polyelectrolytes:  Solutions, Gels, Intermolecular complexes and nanoparticles -- Polyelectrolyte Hydrogels: Thermodynamics -- Thermodynamic and rheological properties of polyelectrolyte systems -- Complexes formation between proteins and polyelectrolytes and their application in the downstream processes of enzyme purification -- Polyelectrolyte complexes: Bridging the ensemble average - single-molecule strategies -- Stratified Interpolyelectrolyte Complexes: Fabrication, Structure and Properties -- Monte Carlo Studies in Polyelectrolyte Solutions: Structure and Thermodynamics --  .