Re: [gmx-users] OPLSAA parameters

2011-07-30 Thread Justin A. Lemkul
Elisabeth wrote: Hello to all, I am looking for bonded and nonbonded parameters for C H atoms in saturated hydrocarbons. atom types are: Carbon atoms opls_135 opls_136 H opls_140 opls_135 12.01100 ; alkane CH3 opls_136 12.01100 ; alkane CH2 opls_1401.00800 ;

[gmx-users] distance and angle cutoff for hydrogen bond

2011-07-30 Thread atila petrosian
Dear gromacs users in gromacs manual, there is [-a real 30 Cutoff angle (degrees, Acceptor - Donor - Hydrogen) -r real 0.35 Cutoff radius (nm, X - Acceptor, see next option)] I think that in hb (D-H...A) distance of 0.35 nm = distance between D and A. and angle of 30 = acceptor-donor–hydrogen

[gmx-users] calculate potential in the box contain ions

2011-07-30 Thread Saeid Akbarshahi
Deer users The simulation box contains sodium and chloride ions start simulation pdb2gmx -f ion.pdb -posrefc 0 Force Field : AMBER99SB-ILDN  - Water TIP3P editconf -f conf.gro -bt cubic -box 3 3 3 genbox -cp out.gro -cs spc216.gro -o 5.gro -p topol.top grompp -f minim.mdp -c 5.gro -p

[gmx-users] calculate potential in the box contain ions

2011-07-30 Thread Saeid Akbarshahi
Dear users The simulation box contains sodium and chloride ions start simulation pdb2gmx -f ion.pdb -posrefc 0 Force Field : AMBER99SB-ILDN  - Water TIP3P editconf -f conf.gro -bt cubic -box 3 3 3 genbox -cp out.gro -cs spc216.gro -o 5.gro -p topol.top grompp -f minim.mdp -c 5.gro -p

Re: [gmx-users] distance and angle cutoff for hydrogen bond

2011-07-30 Thread Justin A. Lemkul
atila petrosian wrote: Dear gromacs users in gromacs manual, there is [-a real 30 Cutoff angle (degrees, Acceptor - Donor - Hydrogen) -r real 0.35 Cutoff radius (nm, X - Acceptor, see next option)] I think that in hb (D-H...A) distance of 0.35 nm = distance between D and A. and angle of

Re: [gmx-users] calculate potential in the box contain ions

2011-07-30 Thread Justin A. Lemkul
Saeid Akbarshahi wrote: Deer users The simulation box contains sodium and chloride ions start simulation pdb2gmx -f ion.pdb -posrefc 0 Force Field : AMBER99SB-ILDN - Water TIP3P editconf -f conf.gro -bt cubic -box 3 3 3 genbox -cp out.gro -cs spc216.gro -o 5.gro -p topol.top grompp -f

Re: [gmx-users] umbrella sampling

2011-07-30 Thread Qian Wang
Thanks very much. I am sorry I did not describe my question very clear. In my system, I am going to obtain three things. (1) the free energy versus distance, which I can obtain from g_wham. (2) the free energy versus, eg, the radius of gyration of the object A. (3) the 2-D free energy as a

[gmx-users] query on Free energy perturbation

2011-07-30 Thread Sanku M
Hi, I was planning to use Thermodynamic integration to calculate solvation free energy of a molecule in a solvent. I was following Justin Lemkul's online tutorial. http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/free_energy/01_theory.html . I found that a) a sd

Re: [gmx-users] query on Free energy perturbation

2011-07-30 Thread Justin A. Lemkul
Sanku M wrote: Hi, I was planning to use Thermodynamic integration to calculate solvation free energy of a molecule in a solvent. I was following Justin Lemkul's online tutorial. http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/free_energy/01_theory.html . I found

[gmx-users] protein in membrane

2011-07-30 Thread Sweta Iyer
Hi, I used the inflategro.pl script to insert my protein into the membrane and scaled down the lipids until it reached the recommended area per lipid value. After removing 4 lipid molecules, I started with an area of 90 square angstrom and reached a value of 65 square angstrom within just 5

Re: [gmx-users] protein in membrane

2011-07-30 Thread wibke . sudholt
Dear Email Sender, Thank you very much for contacting me! Unfortunately, I am not available in the office at the moment and cannot respond to your email. I will be able to handle your request starting again Thursday, August 4, 2011. For all questions about CloudBroker and the CloudBroker

Re: [gmx-users] protein in membrane

2011-07-30 Thread Justin A. Lemkul
Sweta Iyer wrote: Hi, I used the inflategro.pl script to insert my protein into the membrane and scaled down the lipids until it reached the recommended area per lipid value. After removing 4 lipid molecules, I started with an area of 90 square angstrom and reached a value of 65 square

Re: [gmx-users] calculate potential in the box contain ions

2011-07-30 Thread Justin A. Lemkul
Please keep the discussion on the list; I'm not a private tutor. Saeid Akbarshahi wrote: Dear Justin I have simulated this system with this structure and files.Could you tell me, is my structure correct? I have no clue what is in your system, what settings were used for the simulation,