Int. J. Web and Grid Services, Vol. 6, No. 2, 2010 141 Copyright © 2010 Inderscience Enterprises Ltd. On the extension of the grid-empowered molecular science simulator: MD and visualisation tools Alessandro Costantini* Department of Chemistry, Department of Mathematics and Computer Science, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy E-mail: alex@impact.dyn.unipg.it *Corresponding author Eduardo Gutiérrez, Javier López Cacheiro and Aurelio Rodríguez CESGA, Santiago de Compostela Avenida de Vigo, s/n Campus Sur, 15705, Spain E-mail: eduardo@cesga.es E-mail: jlopez@cesga.es E-mail: aurelio@cesga.es Osvaldo Gervasi Department of Mathematics and Computer Science, University of Perugia, via Vanvitelli 1, 06100 Perugia, Italy E-mail: osvaldo@unipg.it Antonio Laganà Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy E-mail: lag@dyn.unipg.it Abstract: The central block of the Grid Empowered Molecular Simulator GEMS was extended to Molecular Dynamics calculations by implementing the GROMACS code. The Grid porting was carried out using the P-GRADE Portal tool. The performances achieved using this approach were measured and compared with those of other approaches better exploiting the mixed nature of the computing resources available on the Grid. The work was completed by implementing some Grid based graphical rendering utilities and extending the study to another Molecular Dynamics package.