[gmx-users] webpage for searching gromacs mailing archive

2014-10-27 Thread Sanku M
Hi   I used to find the link for searching the previous posted discussions and 
all the threads in the gromacs home page where there used to be a 'search' 
option for looking for discussions on a topic. But, now, looking for the same 
archive in Mailing Lists - Gromacs redirects me to gromacs home page where I 
can not find anything on the archive. I will appreciate if someone can redirect 
me the right webpage. ThanksSanku
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[gmx-users] Time averaged ramachandran plot

2014-10-26 Thread Sanku M
Hi  I plan to plot the ramachandran plot of all the dihedral angles each of 
which is averaged over time-frames of trajectories. But, I find g_rama or g_chi 
gives the time profile of ramachandran plot. But, if I want to plot the 
time-averaged Phi.Psi angles of all residues, is there any method to do 
it.ThanksSanku 
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[gmx-users] treatment of electrostatics in vaccum

2014-08-05 Thread Sanku M
Hi
  I need to run MD of a charged macromolecule in gas-phase or in vaccum. I was 
wondering if I use  no periodic boundary condition ( i.e. setting pbc=no  and 
ns_type=simple), can I get away with non-ewald type electrostatics method ( 
i.e. by using a very large cut-off like 3 or 4 nm for electrostatics  ) ? In 
this case, I wanted to minimize the computing expense associated with PME 
electrostatics. 


Thanks
Sanku
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[gmx-users] angle between benzene rings

2014-03-06 Thread Sanku M
Dear gromacs users
 I would like to compute the angle of orientation between two benzene rings 
that I have simulated using gromacs. 
I think, for this, I have to get the vector normal to the plane of the benzene 
ring and then get the angle of among the unit vectors. Is there any tools in 
gromacs that can help me to do this? Does g_sgangle work here?
Sanku
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[gmx-users] counter ion and charged polymer in gas-phase

2014-02-12 Thread Sanku M
Hi,
  I am doing simulation of charged polymer . When I do the simulation in water 
or solvent, I put counter ion in the solvent to neutralize the charge in the 
system. But, if I want to do the simulation in gas-phase ( i.e no solvent), 
does adding counter-ion make any sense or is it realistic? I mean : does 
counterion remain present in gas-phase ?  Or, should I use charged system which 
might get neutralized by back-ground neutralizing effect of Particle-Mesh Ewald?
Thanks
Sanku
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