[gmx-users] control parameter on the Lennard-Jones interactions

2019-05-15 Thread battistia
Dear gromacs members, I would ask you if in gromacs is possible to add a control parameter on the Lennard-Jones interactions. For example we have two atoms A and B and the corresponding parameters; sigma(A), eps(A), sigma(B), esp(B); then for the A-B interactions we have the parameters

Re: [gmx-users] Charmm 36m

2019-05-15 Thread Mateusz Bieniek
Yes, the 36m (CHARMM36m) is the new set of parameters recommended by the authors, so it is best to stick to the recommendation unless you know exactly what you are doing. Huang, J. et al., 2016. CHARMM36m: an improved force field for folded and intrinsically disordered proteins. *Nature Methods*,

[gmx-users] Charmm 36m

2019-05-15 Thread Coire Gavin-Hanner
Dear Gromacs users, I am trying to use the charmm36m forcefield to simulate a protein. The most recent release of charmm36 includes 36m and the ability to toggle between the two. Is 36m the default state? Best regards, Coire -- Gromacs Users mailing list * Please search the archive at

Re: [gmx-users] select an atom for "only" residue with make_ndx

2019-05-15 Thread Justin Lemkul
On 5/15/19 11:03 AM, ABEL Stephane wrote: Hello all, I am currently doing simulations of a model of membranes with different types of lipids (LIPIDA, LIPIDB and LIPIDC) and I would like to select a group of atoms for only the same lipid with make_ndx. Below an example Three different

[gmx-users] select an atom for "only" residue with make_ndx

2019-05-15 Thread ABEL Stephane
Hello all, I am currently doing simulations of a model of membranes with different types of lipids (LIPIDA, LIPIDB and LIPIDC) and I would like to select a group of atoms for only the same lipid with make_ndx. Below an example Three different lipids : LIPIDA, LIPIDB and LIPIDC contain few

[gmx-users] LINCS error during EM

2019-05-15 Thread Dhrubajyoti Maji
Dear all, The gmx dielectric command gives negative value of imaginary part in gromacs-2018.3. I can't get the reason. It will be highly helpful if someone make a suggestion. Thank you. Dhrubajyoti Maji -- Gromacs Users mailing list * Please search the archive at

Re: [gmx-users] Young and Cheatham ions parameters for gromacs

2019-05-15 Thread David van der Spoel
Den 2019-05-15 kl. 08:12, skrev Harutyun Sahakyan: Dear GMX users I would like to use Young and Cheatham ions parameters ( https://pubs.acs.org/doi/full/10.1021/jp8001614#si1) with amber99sb-ildn. How can I convert sigma and epsilon values and use them with gromacs? For instance, I want to use

[gmx-users] Young and Cheatham ions parameters for gromacs

2019-05-15 Thread Harutyun Sahakyan
Dear GMX users I would like to use Young and Cheatham ions parameters ( https://pubs.acs.org/doi/full/10.1021/jp8001614#si1) with amber99sb-ildn. How can I convert sigma and epsilon values and use them with gromacs? For instance, I want to use K and Cl ions with scpe water, sigma (*R* min/2) and