[gmx-users] A question about simulation system includes more than 100000 atoms using Gromacs

2015-07-19 Thread 张竹青
Dear Madam/Sir,

  I have recently tried to use Gromacs to simulation a biolmoleculal system 
including more than 10 atoms. As usually, the .gro file just supports the 
system with atom number up to 9. But there are some publications in which 
researchers used Gromacs to simulate like ribosom systems, which includes more 
than 200 atoms. So, could you give some advice on how to do it? Does it 
need to change the source codes?

  Thanks,

  Zhuqing

 








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Re: [gmx-users] A question about simulation system includes more than 100000 atoms using Gromacs

2015-07-19 Thread Ming Tang
my system includes1,700,000 atoms, and runs well with 5.0.4.

Sent from my Huawei Mobile

张竹青 zhuqingzh...@ucas.ac.cn wrote:

Dear Madam/Sir,

  I have recently tried to use Gromacs to simulation a biolmoleculal system 
including more than 10 atoms. As usually, the .gro file just supports the 
system with atom number up to 9. But there are some publications in which 
researchers used Gromacs to simulate like ribosom systems, which includes more 
than 200 atoms. So, could you give some advice on how to do it? Does it 
need to change the source codes?

  Thanks,

  Zhuqing










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Re: [gmx-users] A question about simulation system includes more than 100000 atoms using Gromacs

2015-07-19 Thread Jan Jirsák
Hi Zhuquing,

as far as I know, atom numbers in .gro file are irrelevant - gromacs
asigns indices based on the order of records in the file. I my
configurations numbers are often quite random, as I copy and paste
coordinates from different sources. It never caused any problems in
gromacs (neverheless, it can cause troubles in visualisation
software).

Regards,
Jan

2015-07-19 12:10 GMT+02:00 张竹青 zhuqingzh...@ucas.ac.cn:
 Dear Madam/Sir,

   I have recently tried to use Gromacs to simulation a biolmoleculal system 
 including more than 10 atoms. As usually, the .gro file just supports the 
 system with atom number up to 9. But there are some publications in which 
 researchers used Gromacs to simulate like ribosom systems, which includes 
 more than 200 atoms. So, could you give some advice on how to do it? Does 
 it need to change the source codes?

   Thanks,

   Zhuqing










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Re: [gmx-users] Calculating hydrogen bonding density - issues with g_sas?

2015-07-19 Thread Teemu Murtola
Hi,

and sorry for a bit late reply. g_sas (or gmx sasa) does not compute the
volume correctly if your solute crosses a periodic boundary. In 5.1, there
is a note to this effect in the documentation, but it is tricky to actually
detect this condition in the code. But what this means is that you cannot
compute the volume of, e.g., a periodic slab using g_sas. With proper use
of trjconv, you can still compute the volume of a multi-molecule droplet.

Best regards,
Teemu

On Wed, Jul 8, 2015 at 6:59 PM Dan Gil dan.gil9...@gmail.com wrote:

 Is g_sas applicable to more than one molecule at a time?

 I have 4500 water molecules in the liquid state. I am using the command:
 g_sas -f traj.trr -s topol.tpr -tv volume.xvg


 On Tue, Jul 7, 2015 at 10:31 AM, Dan Gil dan.gil9...@gmail.com wrote:

  I am using the default radius of 0.14 nm. In this case, I believe that it
  is consistent. Nevertheless, I have tried using a probe much larger with
 no
  significant difference in the results.
  The way I am using g_sas is: I have 4500 water molecules. I specified
 that
  I want the volume of all of them.
 
  On Tue, Jul 7, 2015 at 10:11 AM, Mark Abraham mark.j.abra...@gmail.com
  wrote:
 
  Hi,
 
  Is the radius being used consistent with your assumption?
 
  Mark
 
  On Tue, Jul 7, 2015 at 3:58 PM Dan Gil dan.gil9...@gmail.com wrote:
 
   Hi,
  
   I am using g_hbond to count the number of h-bonds and then g_sas to
   calculate the volume. I want to get the number of hydrogen bonds per
   volume. But I am having issues with g_sas - the volume calculated is
  about
   one half of the expected value. For instance, in a pure water system
  (NVT,
   SPCE, T=300K) periodic in the x and y directions, volume was found to
 be
   about 60nm^3, whereas I expected 130nm^3.
  
   I would appreciate any advice!

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Re: [gmx-users] RDF

2015-07-19 Thread V.V.Chaban
Search for my papers Vitaly V. Chaban. You will find many papers
determining solvation/solubility, where it is described how solubility
can be obtained from atomistic simulations.

RDF alone is not a proper descriptor. However, if you plot COM-COM RDF
for C60, you will get some solubility related information (but not
numerical solubility).

In my personal opinion, even with what you call binders solubility of
C60 is water is small. You will not be able to record it using small
MD systems.

Best of luck.




On Sat, Jul 18, 2015 at 7:08 AM, soumadwip ghosh
soumadwipgh...@gmail.com wrote:
 Dear all,
 I have attempted to show the dynamics of a C60 molecule in
 presence of aqueous soluble binders. I am using GROMOS53A6 force field and
 SPC/E water. I took the pdb as well as the itp file of both from the ATB
 server. I ran simulations using GROMACS 4.5.6 of fullerene both in presence
 and absence of the organic binders for 70 ns. In order to see whether
 fullerene becomes water dispersible or not I have planned to to calculate
 delta G solvation for both the cases using the thermodynamic integration
 method. But as of now, if in presence of a binder fullerene is more water
 soluble as compared to its pristine form this should be reflected in the
 RDF calculation between fullerene center of mass and Oxygen atoms fro water
 but as you can show in the link below, the reverse thing is happening.
 Link
 https://drive.google.com/file/d/0B7SBnQ5YXQSLVFY0MEItUTAzY1E/view?usp=sharing
 Is there something wrong with my approach. FYI I took 8 SDS binders which
 wraps around the fullerene molecule. I think I am missing out something
 very trivial.

 Any kind of help will be appreciated.

 Soumadwip Ghosh
 Research Fellow
 IITB
 India
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[gmx-users] Questions about GROMACS capabilities

2015-07-19 Thread Eric Smoll
Hello GROMACS users,

I have a few questions about what is possible in GROMACS:

1.) Is it possible reset the velocity of a subset of molecules in a MD
simulation to an arbitrary, non-thermal distribution? I am particularly
interested in the situation where all molecules of a certain type are reset
to a fixed COM speed in a fixed direction.

2.) If it is possible to reset the velocity of particles in a MD
simulation, is it possible to do so with a spatial trigger (e.g., all
molecules that reach the top of the unit cell have their velocity reset to
a specific speed and direction)?

3.) Is it possible to make a gas-liquid system where there are gas-liquid
interactions but no gas-gas interactions?

Best,
Eric
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[gmx-users] segmentation fault

2015-07-19 Thread Sikandar Mashayak
Hi,

I am trying to simulate a confined water system with gromacs 5.0.5,
however, I am getting the segmentation fault. Below are the gdb backtrace
and the build info.


Thanks,
Sikandar

backtrace::

#0  0x7767d8dd in _mm_loadu_pd (tab_coul_F=0x7fffe6217100,
tab_coul_V=0x7fffe621b560, ti_S=..., ti=0x0, ctab0_S=0x7fffea947560,
ctab1_S=0x7fffea947550, ctabv_S=0x7fffea947510) at
/usr/local/gcc-4.7.1/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/include/emmintrin.h:113
#1  load_table_f_v (tab_coul_F=0x7fffe6217100, tab_coul_V=0x7fffe621b560,
ti_S=..., ti=0x0, ctab0_S=0x7fffea947560, ctab1_S=0x7fffea947550,
ctabv_S=0x7fffea947510) at
/home/mashaya1/Apps/gromacs/source/src/gromacs/mdlib/nbnxn_kernels/simd_4xn/../nbnxn_kernel_simd_utils_x86_128d.h:168
#2  0x77688e9b in nbnxn_kernel_ElecQSTab_VdwLJ_VgrpF_4xn
(nbl=0x7fffe5800920, nbat=0x7fffe6200a80, ic=0x7fffe6205f80,
shift_vec=0x7a7de0,
f=0x7fffdde37010, fshift=0x7fffe6203740, Vvdw=0x7fffe6203be0,
Vc=0x7fffe6203c70)
at
/home/mashaya1/Apps/gromacs/source/src/gromacs/mdlib/nbnxn_kernels/simd_4xn/nbnxn_kernel_simd_4xn_inner.h:628
#3  0x777c760f in nbnxn_kernel_simd_4xn._omp_fn.0 ()
at
/home/mashaya1/Apps/gromacs/source/src/gromacs/mdlib/nbnxn_kernels/simd_4xn/nbnxn_kernel_simd_4xn.c:412
#4  0x7304681a in gomp_thread_start (xdata=Unhandled dwarf
expression opcode 0xf3
) at ../../../src/gcc-4.7.1/libgomp/team.c:116
#5  0x72c139d1 in start_thread () from /lib64/libpthread.so.0
#6  0x729608fd in clone () from /lib64/libc.so.6


Version and built info.

Gromacs version:VERSION 5.0.5-20150513-33467fd
GIT SHA1 hash:  33467fd9bc5f94d704b071f0193da0a6ff0ea19b
Precision:  double
Memory model:   64 bit
MPI library:MPI
OpenMP support: enabled
GPU support:disabled
invsqrt routine:gmx_software_invsqrt(x)
SIMD instructions:  SSE4.1
FFT library:fftw-3.3.3-sse2
RDTSCP usage:   enabled
C++11 compilation:  enabled
TNG support:enabled
Tracing support:disabled
Built on:   Sun Jul 19 19:24:25 CDT 2015
Built by:   mashaya1@taub189 [CMAKE]
Build OS/arch:  Linux 2.6.32-504.16.2.el6.x86_64 x86_64
Build CPU vendor:   GenuineIntel
Build CPU brand:Intel(R) Xeon(R) CPU   X5650  @ 2.67GHz
Build CPU family:   6   Model: 44   Stepping: 2
Build CPU features: aes apic clfsh cmov cx8 cx16 htt lahf_lm mmx msr
nonstop_tsc pcid pclmuldq pdcm pdpe1gb popcnt pse rdtscp sse2 sse3 sse4.1
sse4.2 ssse3
C compiler: /usr/local/mpi/openmpi-1.6.5-gcc-4.7.1/bin/mpicc GNU
4.7.1
C compiler flags:-msse4.1-Wno-maybe-uninitialized -Wextra
-Wno-missing-field-initializers -Wno-sign-compare -Wpointer-arith -Wall
-Wno-unused -Wunused-value -Wunused-parameter  -g -fno-inline
C++ compiler:   /usr/local/mpi/openmpi-1.6.5-gcc-4.7.1/bin/mpicxx GNU
4.7.1
C++ compiler flags:  -msse4.1   -std=c++0x  -Wextra
-Wno-missing-field-initializers -Wpointer-arith -Wall -Wno-unused-function
-g -fno-inline
Boost version:  1.51.0 (external)
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[gmx-users] How to calculate magnesium (MG) parameters for gbsa.itp

2015-07-19 Thread Hassan Aaryapour
Dear Gromacs Users,
I have taken error below after runnig:
gmx grompp -f md-implicit-gpu.mdp -c conf.gro -p topol.top -n index.ndx -o
md-implicit.tpr

GB parameter(s) missing or negative for atom type 'MG'
...
Fatal error:
Can't do GB electrostatics; the implicit_genborn_params section of the
forcefield is missing parameters for 1 atomtypes or they might be negative.

How can I calculate Magnesium (MG) parameters for gbsa.itp in implicit
simulation? I would greatly appreciate if anyone could kindly help me.

Best Wishes
Hassan
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Re: [gmx-users] A question about simulation system includes more than 100000 atoms using Gromacs

2015-07-19 Thread 张竹青
Hi Jan,

  Thank you very much for your reply.

  I tried to use pdb2gmx (gromacs v4.5.5), in fact, for the chain with the atom 
number serial larger than 1 in pdb file, it can bot be recognized.

  Best,

  Zhuqing


 -原始邮件-
 发件人: Jan Jirsák janjir...@gmail.com
 发送时间: 2015年7月19日 星期日
 收件人: gmx-us...@gromacs.org
 抄送: 
 主题: Re: [gmx-users] A question about simulation system includes more than 
 10 atoms using Gromacs
 
 Hi Zhuquing,
 
 as far as I know, atom numbers in .gro file are irrelevant - gromacs
 asigns indices based on the order of records in the file. I my
 configurations numbers are often quite random, as I copy and paste
 coordinates from different sources. It never caused any problems in
 gromacs (neverheless, it can cause troubles in visualisation
 software).
 
 Regards,
 Jan
 
 2015-07-19 12:10 GMT+02:00 张竹青 zhuqingzh...@ucas.ac.cn:
  Dear Madam/Sir,
 
I have recently tried to use Gromacs to simulation a biolmoleculal system 
  including more than 10 atoms. As usually, the .gro file just supports 
  the system with atom number up to 9. But there are some publications in 
  which researchers used Gromacs to simulate like ribosom systems, which 
  includes more than 200 atoms. So, could you give some advice on how to 
  do it? Does it need to change the source codes?
 
Thanks,
 
Zhuqing
 
 
 
 
 
 
 
 
 
 
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Re: [gmx-users] MD exit condition

2015-07-19 Thread Eric Smoll
Hello Gromacs users,

In response to a question on setting a group-group distance as an MD exit
condition, Mark Abraham suggested that it might be possible to use a
table-specified bond that would terminate a simulation by generating an
infinite force and crashing mdrun.

I am interested in revisiting this idea with a slightly more complex exit
condition. How would I define a simulation that will crash when the
z-component of a fictious bond between two groups exceeds a certain value
in a specific cartesian direction (e.g., the z-component)? Is this
impossible in GROMACS?

Best,
Eric

On Thu, Aug 28, 2014 at 6:58 AM, Mark Abraham mark.j.abra...@gmail.com
wrote:

 On Thu, Aug 28, 2014 at 3:32 PM, Eric Smoll ericsm...@gmail.com wrote:

  Hello Gromacs users,
 
  I am using Gromacs 4.6.5
 
  Is there a way to set an exit condition during a simulation? I am
  interested in terminating dynamics when two groups are separated by a
  certain distance.
 

 No. People want this, but it's never been a priority for someone with the
 knowledge to implement it. Creative use of a bond with a malware user
 table could produce infinite forces that will get mdrun to blow up shortly
 after the condition is reached, but I can't honestly recommend that! :-D

 One reasonable approach might be to use the pull code to achieve the
 distance in a controlled way.

 If it is not possible to set an exit condition, I suspect I can post
  process the trajectory with trjconv using the -exec flag and/or the
 -trunc
  flag:
 
  1.) The manual states that the -exec flag will Execute a command for
 every
  output frame with the frame number as argument. What kinds of commands I
  can pass to this flag?
 

 Intended for use with -sep or -split. Command gets passed the number of the
 file most recently written, and then has to go do its own file parsing. I
 would rather use g_dist or such.

 2.) If the -exec is not useful, I plan to analyse the the output of
  g_dist to find the the time t when two groups exceed my distance
  criterion and run trjconv -trunc t to crop the trajectory
 appropriately.
  Is there a better way?
 

 You could probably use NAMD :-)

 Mark


  Best,
  Eric
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Re: [gmx-users] g_hbond : normalization autocorrelation function.

2015-07-19 Thread Nilesh Dhumal
Erik,

I want autocorrelation function without normalization.

Exact value at t=0, t=1 is with normalization.

Nilesh


 Hi Nilesh,

 I’m not sure what you mean. Both Ac_finSys and Ac are 1 at t=0. What
 normalisation do you expect?

 Kind regards,
 Erik

 Erik Marklund, PhD
 Postdoctoral Research Fellow
 Fulford JRF, Somerville College

 Department of Chemistry
 Physical  Theoretical Chemistry Laboratory
 University of Oxford
 South Parks Road
 Oxford
 OX1 3QZ

 On 19 Jul 2015, at 04:07, Nilesh Dhumal ndhu...@andrew.cmu.edu wrote:

 Hello,

 I am calculating autocorrelation function without normalization using
 g_hbond

 g_hbond -f test.pdb -s 3.tpr -nonormalize -n hydrogen_1.ndx -ac
 ./test/hbac_3.xvg -num ./test/num_3.xvg

 The output,  hbac_3.xvg, don't have normalized auto correlation
 function.
 Here is initial part

 @title Hydrogen Bond Autocorrelation
 @xaxis  label Time (ps)
 @yaxis  label C(t)
 @TYPE xy
 @ view 0.15, 0.15, 0.75, 0.85
 @ legend on
 @ legend box on
 @ legend loctype view
 @ legend 0.78, 0.8
 @ legend length 2
 @ s0 legend Ac\sfin sys\v{}\z{}(t)
 @ s1 legend Ac(t)
 @ s2 legend Cc\scontact,hb\v{}\z{}(t)
 @ s3 legend -dAc\sfs\v{}\z{}/dt
 0   1   1  6.67572e-060.761129
  0.050.9619280.99214633980.401535
   0.10.9598460.9917173496   0.0419408
  0.150.9577340.9912813599   0.0340092
   0.20.9564460.99101536600.022918


 Why is it not normalized ?

 Thanks,

 Nilesh

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Re: [gmx-users] Problem running equilibration step

2015-07-19 Thread Priyanka Patel
Thank you Justin !

-Priyanka


On Thu, Jul 16, 2015 at 5:21 PM, Justin Lemkul jalem...@vt.edu wrote:



 On 7/16/15 7:35 AM, Priyanka Patel wrote:

 Hello Felipe,

 Thanks for quick response,

 I have change my nvt.mdp file according to your instruction, but still
 getting the following error;

 Fatal error:
 Invalid T coupling input: 1 groups, 2 ref-t values and 2 tau-t values


 Again, the error is rather obvious.  You have one group and you're trying
 to set up two thermostat reference and relaxation values.

 Also note that you should not use the tutorial's settings (which are for
 OPLS) when using the CHARMM force field.  Those settings are at
 http://www.gromacs.org/Documentation/Terminology/Force_Fields/CHARMM

 -Justin

 --
 ==

 Justin A. Lemkul, Ph.D.
 Ruth L. Kirschstein NRSA Postdoctoral Fellow

 Department of Pharmaceutical Sciences
 School of Pharmacy
 Health Sciences Facility II, Room 629
 University of Maryland, Baltimore
 20 Penn St.
 Baltimore, MD 21201

 jalem...@outerbanks.umaryland.edu | (410) 706-7441
 http://mackerell.umaryland.edu/~jalemkul

 ==

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-- 
Regards,
Priyanka Patel
Mo:+91-8805811500
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Re: [gmx-users] g_hbond : normalization autocorrelation function.

2015-07-19 Thread Erik Marklund
Hi Nilesh,

I’m not sure what you mean. Both Ac_finSys and Ac are 1 at t=0. What 
normalisation do you expect?

Kind regards,
Erik

Erik Marklund, PhD
Postdoctoral Research Fellow
Fulford JRF, Somerville College

Department of Chemistry
Physical  Theoretical Chemistry Laboratory
University of Oxford
South Parks Road
Oxford
OX1 3QZ

 On 19 Jul 2015, at 04:07, Nilesh Dhumal ndhu...@andrew.cmu.edu wrote:
 
 Hello,
 
 I am calculating autocorrelation function without normalization using g_hbond
 
 g_hbond -f test.pdb -s 3.tpr -nonormalize -n hydrogen_1.ndx -ac
 ./test/hbac_3.xvg -num ./test/num_3.xvg
 
 The output,  hbac_3.xvg, don't have normalized auto correlation function.
 Here is initial part
 
 @title Hydrogen Bond Autocorrelation
 @xaxis  label Time (ps)
 @yaxis  label C(t)
 @TYPE xy
 @ view 0.15, 0.15, 0.75, 0.85
 @ legend on
 @ legend box on
 @ legend loctype view
 @ legend 0.78, 0.8
 @ legend length 2
 @ s0 legend Ac\sfin sys\v{}\z{}(t)
 @ s1 legend Ac(t)
 @ s2 legend Cc\scontact,hb\v{}\z{}(t)
 @ s3 legend -dAc\sfs\v{}\z{}/dt
 0   1   1  6.67572e-060.761129
  0.050.9619280.99214633980.401535
   0.10.9598460.9917173496   0.0419408
  0.150.9577340.9912813599   0.0340092
   0.20.9564460.99101536600.022918
 
 
 Why is it not normalized ?
 
 Thanks,
 
 Nilesh
 
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