Dear list,

earlier I posted a message on the list about rising energies in md simulation and I still have not found a solution (see a thread with the header "incomparable results with files produced with gromacs3.2.1 and 3.3.1"). I observed that the energies rise in any simulation I'm trying, i.e. any ligand or protein whether simulated in complex or alone. I got one suggestion that the temperature (entropy) could be the reason for weird behaviour of the potential energy. I'm simulating at 310K, and I studied the effect of the temperature and found the following:

-at 50 K the potential energy decreases as it should and as it has done earlier at 310K

-at 200K the potential energy rises immediately at the beginning, but after 0.2 ps, the energy decreases below the starting point

-at 250 the potential energy rises and stays high

I would like to simulate the system at body temperature. Any suggestions how to do that?

Regards,

Sampo
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