Introduction to Grid Infrastructures . . 1 How to Port Applications on Grid: A Short Review . . 15 GRIDSEED: A Virtual Training Grid Infrastructure . . 39 Porting Applications to the Grid . . 55 On the Structuring of a Molecular Simulator as a Grid Service . . 63 Ab Initio Electronic Structure Computations on EGEE Grid . . 83 Q5Cost Format and Library: A Tutorial About the Common Format for Quantum Chemistry Interoperability . . 103 Protein Folding by Bias Exchange Metadynamics on a Grid Infrastructure . . 125 On the Grid Implementation of a Quantum Reactive Scattering Program . . 145 Calculation of Phonon Dispersions on the Grid Using Quantum ESPRESSO . . 163 Exploiting Grids for Applications in Condensed Matter Physics . . 187 Implementation of a Semiclassical Initial Value Representation Code on the Grid to Calculate Rate Coefficients of Atom Diatom Reaction . . 203