Re: [gmx-users] Conversion of the GLYCAM dihedral parameters in the GROMACS format.

2011-07-20 Thread Austin B. Yongye
are always set to 0 and  the barrier heights have sometime a negative value. Thank you again for your advice. SA- Message: 1 Date: Tue, 19 Jul 2011 11:08:55 -0700 (PDT) From: Austin B. Yongye ybau...@yahoo.com Subject: Re: [gmx-users] Conversion of the GLYCAM dihedral parameters

Re: [gmx-users] Conversion of the GLYCAM dihedral parameters in the GROMACS format.

2011-07-19 Thread Austin B. Yongye
It is normal to have combinations of negative and positive values for the barrier heights. Those are just the best coefficients to reproduce some QM rotational energy curve during the parameterization.  The negative periodicities are a convention from AMBER. They simply indicate that the

[gmx-users] OPLS-AA atom types

2011-04-05 Thread Austin B. Yongye
Hello GROMACS USERS, Does any one have a document/manual/link that describes the name-number atom type mappings employed in opls-aa? I would like to build some molecules and specify their parameters, but I see different of numbers for the same atom type name, e.g: TYPE NAME 135 CT 136 CT 137

Re: [gmx-users] OPLS-AA atom types

2011-04-05 Thread Austin B. Yongye
: Tuesday, April 5, 2011, 5:19 AM Austin B. Yongye wrote: Hello GROMACS USERS, Does any one have a document/manual/link that describes the name-number atom type mappings employed in opls-aa? The correspondence between the atom types and bonded types is all contained

Re: [gmx-users] OPLS-AA atom types

2011-04-05 Thread Austin B. Yongye
AM Austin B. Yongye wrote: Thanks Justin. Could you/someone please forward the file? I don't have it. It's part of your Gromacs installation.  $GMXLIB/oplsaa.ff/ffnonbonded.itp. If you don't have it, then Gromacs wasn't properly installed and you won't be able to use whatever

Re: [gmx-users] OPLS-AA atom types

2011-04-05 Thread Austin B. Yongye
users gmx-users@gromacs.org Date: Tuesday, April 5, 2011, 7:32 AM Austin B. Yongye wrote: Justin: I am using gromacs version 4.0.2. Several attempts to download current gromacs versions from http://www.gromacs.org/Downloads kept yielding 93.0-byte files. So I re-installed my pre

Re: [gmx-users] [Fwd: g_sas for each residu]

2010-12-13 Thread Austin B. Yongye
Others alternatives are welcome. Look up NACCESS. It can do what you want on pdb frames extracted from a trajectory. --- On Mon, 12/13/10, Justin A. Lemkul jalem...@vt.edu wrote: From: Justin A. Lemkul jalem...@vt.edu Subject: Re: [gmx-users] [Fwd: g_sas for each residu] To: Discussion