Re: [gmx-users] mdrun-adjusted cutoffs?!

2018-12-05 Thread Mark Abraham
Hi, One needs to be more specific than NB. There is evidence that VDW cutoffs of traditional lengths cause approximation errors that cause compensating parameterization errors elsewhere; those effects get worse if the system is inhomogeneous. Accordingly, mdrun never touches VDW cutoffs.

Re: [gmx-users] mdrun-adjusted cutoffs?!

2018-12-05 Thread Alex
Hi Mark, I am not sure it is a concern, to be honest, so let me just lay out my thoughts and maybe you could share your opinion. I recently shared a link for our recent paper (https://www.nature.com/articles/s41563-018-0220-4), in which the quantity of interest is ion current via pores that

Re: [gmx-users] mdrun-adjusted cutoffs?!

2018-12-05 Thread Mark Abraham
Hi, There's quite detailed discussion of the treatment of pair searching in section 3.4.2 of the reference manual. Perhaps that clarifies things? We're not aware of a reason to want to control things manually, but if you have one, we're keen to hear of it! Mark On Wed., 5 Dec. 2018, 09:59 Alex

[gmx-users] Question on pressure coupling

2018-12-05 Thread Mohsen Ramezanpour
Dear Gromacs users, Inverted hexagonal phases are usually simulated (and should be) using a triclinic box with either semi-isotropic or anisotropic pressure couplings. I am not sure what a semi-isotropic and anisotropic means in a "Triclinic" box, exactly? The .log files look the same for the

[gmx-users] Umbrella sampling, choice of number of windows

2018-12-05 Thread Nawel Mele
Dear Gromacs Users, I would like to perform umbrella sampling on a protein using RMSD as CV. RMSD would be measured between the simulated structure and a so called active conformation and between an inactive conformation. To do that I am using PLUMED. However, I am new with US simulation and I