Hi, all, I was talking to a friend of mine that works in an MD lab. He said that the charges from QM/MM or semiempirical need to be scaled to charges in the force field. For example, a heme will have specific charges in the force field, while hemes that represent different bound states may have a different charge distribution, depending on which method is used to calculate it. Let us say that the force field charge is +1 for simplicity and the charge is +2 by using other methods. The scaling would suggest that you would reduce the charge of the heme by one half, so that it would be compatible to the force field. However, this doesn't make sense to me, since partial charges should always be related to an electron and therefore, in principle, should never have to be scaled. I would appreciate anyone's input on it.
Best wishes, Art _______________________________________________ gmx-users mailing list gmx-users@gromacs.org http://www.gromacs.org/mailman/listinfo/gmx-users Please don't post (un)subscribe requests to the list. Use the www interface or send it to [EMAIL PROTECTED] Can't post? Read http://www.gromacs.org/mailing_lists/users.php