[gmx-users] Peptide-membrane simulation force field parameters

2015-02-03 Thread tarak karmakar
Dear All, I need a suggestion related to simulation of peptide-membrane system. Are CGenFF parameters (from ParamChem) for peptide analogues good enough to couple with Charmm36 parameters for the lipids in a membrane? (provided very low charge and param penalties) Thanks, Tarak -- Gromacs Users

Re: [gmx-users] Problem with 5.0.4 build

2015-02-03 Thread Mark Abraham
Hi, That suggests that your source tree is dirty, somehow. Unpack a fresh tarball and try again. Mark On Tue, Feb 3, 2015 at 2:33 PM, Jim Tuccillo tucci...@sgi.com wrote: Hi Folks, I am seeing the following problem with a 5.0.4 build. I see that others have had this issue also but I

Re: [gmx-users] Virtual sites and diffusion coefficients.

2015-02-03 Thread sujithkakkat .
Hello Mark, I have tested both models in simulating a variety of properties. The original parametrization results involved predicting the critical point of CO2 and also density at various P and T. I did several NVT simulations to predict density-vs-pressure data. In this case the model with

Re: [gmx-users] Virtual sites and diffusion coefficients.

2015-02-03 Thread Mark Abraham
Hi, With which set of parameters are you able to reproduce the original parametrization results? Mark On Tue, Feb 3, 2015 at 8:04 AM, sujithkakkat . sujithk...@gmail.com wrote: Dear all, I tried simulating the CO2-water mixture with CO2 at a low concentration (0.003 mole fraction) at

Re: [gmx-users] Virtual sites and diffusion coefficients.

2015-02-03 Thread Justin Lemkul
On 2/3/15 3:56 AM, sujithkakkat . wrote: Hello Mark, I have tested both models in simulating a variety of properties. The original parametrization results involved predicting the critical point of CO2 and also density at various P and T. I did several NVT simulations to predict

[gmx-users] Problem with 5.0.4 build

2015-02-03 Thread Jim Tuccillo
Hi Folks, I am seeing the following problem with a 5.0.4 build. I see that others have had this issue also but I haven't seen a solution. Any thoughts on how to address this? Thanks. The build is with the following: cmake .. -DGMX_DOUBLE=ON -DGMX_SIMD=sse4.1 -DCMAKE_C_COMPILER=gcc

[gmx-users] REMD: mdrun_mpi crash with segmentation fault (but mpi is working)

2015-02-03 Thread Felipe Villanelo
Hi, I trying to learn REMD following the tutorial on gromacs page http://www.gromacs.org/Documentation/Tutorials/GROMACS_USA_Workshop_and_Conference_2013/An_introduction_to_replica_exchange_simulations%3A_Mark_Abraham,_Session_1B on a 4-cores computer. However when I try to use the command:

Re: [gmx-users] Problem with Lysozyme in Water Tutorial

2015-02-03 Thread Justin Lemkul
On 2/3/15 2:16 PM, Stephen P. Molnar wrote: Ok. I understand the replys. I only have a couple of further questions. A link to grompp is in /usr/local/gromacs/bin. Why isn't ions.mdp in the run directory and then, where is it? You download it from the tutorial site.

Re: [gmx-users] Problem with Lysozyme in Water Tutorial

2015-02-03 Thread Stephen P. Molnar
Ok. I understand the replys. I only have a couple of further questions. A link to grompp is in /usr/local/gromacs/bin. Why isn't ions.mdp in the run directory and then, where is it? Thanks in advance. On 02/02/2015 12:29 PM, HANNIBAL LECTER wrote: It just means you either missed grompp

[gmx-users] Using pairs type 2

2015-02-03 Thread Liel Sapir
Hey all, I have been reading many post about this issue, but still do not have a clear answer. I am using the AMBER force-field where 1-4 interactions are scaled (fudgeLJ = 0.5 and fudgeQQ = 0.8333). In addition I use parameters of molecules that require the 1-4 interaction to NOT be scaled.

Re: [gmx-users] Problem with Lysozyme in Water Tutorial

2015-02-03 Thread Stephen P. Molnar
On 02/03/2015 02:30 PM, Justin Lemkul wrote: On 2/3/15 2:16 PM, Stephen P. Molnar wrote: Ok. I understand the replys. I only have a couple of further questions. A link to grompp is in /usr/local/gromacs/bin. Why isn't ions.mdp in the run directory and then, where is it? You download

[gmx-users] Creating box,

2015-02-03 Thread Bishnu Acharya
Dear Gromacs User, I am new in Gromacs. I want to create rectangular box like dimensions 5.0 5.0 15.0 and want to put nonane-water-nonane on it. I mean there layers first nonane and water and again nonane layers. Would you please give some idea how to do it. Thank you -- Gromacs Users mailing

Re: [gmx-users] Creating box,

2015-02-03 Thread Justin Lemkul
On 2/3/15 8:32 PM, Bishnu Acharya wrote: Dear Gromacs User, I am new in Gromacs. I want to create rectangular box like dimensions 5.0 5.0 15.0 and want to put nonane-water-nonane on it. I mean there layers first nonane and water and again nonane layers. There aren't two nonane layers,

Re: [gmx-users] Creating box,

2015-02-03 Thread Bishnu Acharya
Thank you very much for your suggestion. On Tue, Feb 3, 2015 at 7:35 PM, Justin Lemkul jalem...@vt.edu wrote: On 2/3/15 8:32 PM, Bishnu Acharya wrote: Dear Gromacs User, I am new in Gromacs. I want to create rectangular box like dimensions 5.0 5.0 15.0 and want to put