Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Erik Marklund
Dear Sathish, Do you actually pull it 20 nm from the DNA, or is your plot showing the wrong units? If that is correct, you have very long-reaching effective interactions in your system. How big is your nanoparticle? Kind regards, Erik Erik Marklund, PhD Postdoctoral Research Fellow Fulford

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Sathish Kumar
Thank you for your kind reply. I pull the RNA from one end of the strand away from nanoparticle. Nanoparticle contains 200 atoms. The distance between center of mass of nanoparticle and RNA in last window is 20 nm only. Best sathish On Fri, Jul 3, 2015 at 1:25 AM, Erik Marklund

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Sathish Kumar
Yes I have pulled upto 20 nm. The distance between final nanoparticle and one end of the RNA is 48 nm. Total box size is 12 50 12. And there is no periodic image interactions also. Please tell me what could be the reason in this case. Thanks sathish On Fri, Jul 3, 2015 at 1:30 AM, Sathish Kumar

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Erik Marklund
Hi, What is your pull geometry, and is your RNA periodic or somehow kept aligned with the x or z axes? Erik On 3 Jul 2015, at 09:50, Sathish Kumar sathishk...@gmail.commailto:sathishk...@gmail.com wrote: Yes I have pulled upto 20 nm. The distance between final nanoparticle and one end of the

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Erik Marklund
On 3 Jul 2015, at 11:31, Erik Marklund erik.markl...@chem.ox.ac.uk wrote: Hi, What is your pull geometry, and is your RNA periodic or somehow kept aligned with the x or z axes? … and is your nanoparticle charged? Erik Erik On 3 Jul 2015, at 09:50, Sathish Kumar

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Sathish Kumar
Pull geometry = distance, Pull rate = 0.005 nm/ps RNA is aligned along Z-axis. it is not periodic. On Fri, Jul 3, 2015 at 3:31 AM, Erik Marklund erik.markl...@chem.ox.ac.uk wrote: Hi, What is your pull geometry, and is your RNA periodic or somehow kept aligned with the x or z axes? Erik

Re: [gmx-users] Regarding PMF profile in umbrella samplling

2015-07-03 Thread Sathish Kumar
Yes it is positive chargedIt has 48 + charges and RNA has 44 negative charges. On Fri, Jul 3, 2015 at 3:38 AM, Erik Marklund erik.markl...@chem.ox.ac.uk wrote: On 3 Jul 2015, at 11:31, Erik Marklund erik.markl...@chem.ox.ac.uk wrote: Hi, What is your pull geometry, and is your