GROMOS
GROningen MOlecular Simulation (GROMOS) is the name of a force field for molecular dynamics simulation, and a related computer software package. Both are developed at the University of Groningen, and at the Computer-Aided Chemistry Group at the Laboratory for Physical Chemistry at the Swiss Federal Institute of Technology (ETH Zurich). At Groningen, Herman Berendsen was involved in its development. The united atom force field was optimized with respect to the condensed phase properties of alkanes. Versions. GROMOS87. Aliphatic and aromatic hydrogen atoms were included implicitly by representing the carbon atom and attached hydrogen atoms as one group centered  on the carbon atom, a united atom force field. The van der Waals force parameters were derived from calculations of the crystal structures of hydrocarbons, and on amino acids using short (0.8 nm) nonbonded cutoff radii. GROMOS96. In 1996, a substantial rewrite of the software package was released. The force field was also improved, e.g., in the following way: aliphatic CH groups were represented as united atoms with van der Waals interactions reparametrized on the basis of a series of molecular dynamics simulations of model liquid alkanes using long (1.4 nm) nonbonded cutoff radii. This version is continually being refined  and several different parameter sets are available. GROMOS96 includes studies of molecular dynamics, stochastic dynamics, and energy minimization. The energy component was also part of the prior GROMOS, named GROMOS87. GROMOS96 was planned and conceived during a time of 20 months. The package is made of 40 different programs, each with a different essential function. An example of two important programs within the GROMOS96 are PROGMT, in charge of constructing molecular topology and also PROPMT, changing the classical molecular topology into the path-integral molecular topology. GROMOS05. An updated version of the software package was introduced in 2005. GROMOS11. The  current GROMOS release is dated in May 2011. Parameter sets. Some of the force field parameter sets that are based on the GROMOS force field. The A-version applies to aqueous or apolar solutions of proteins, nucleotides, and sugars. The B-version applies to isolated molecules (gas phase).