Re: [gmx-users] Addition of ions in vacuum simulations

2007-10-18 Thread David van der Spoel
-Original Message- From: "Mark Abraham" <[EMAIL PROTECTED]> To: "Discussion list for GROMACS users" Date: Thu, 18 Oct 2007 16:49:15 +1000 (EST) Subject: Re: [gmx-users] Addition of ions in vacuum simulations Hi all, I am simulating a charged peptide in vacuum. I want

Re: [gmx-users] Addition of ions in vacuum simulations

2007-10-18 Thread Xavier Periole
What Mark means is that there us little meaning of adding ions in a simulation of a protein in vacuum. There is little sense and use of a simulation of a protein in vacuum, but that could depend on what you are looking for. There is little sense in putting ions in a vacuum environment to neutra

Re: Re: [gmx-users] Addition of ions in vacuum simulations

2007-10-18 Thread Mark Abraham
> Hi Mark, > > I think, it is not a chemistry question exactly. > Genion command asks for a group whose atoms are replaced with ions. > I have no solvent molecules in my system. > In this respect, how can I incorporate ions into my system? Check your assumptions. Does it make sense to put isolated

Re: Re: [gmx-users] Addition of ions in vacuum simulations

2007-10-18 Thread OZGE ENGIN
raham" <[EMAIL PROTECTED]> To: "Discussion list for GROMACS users" Date: Thu, 18 Oct 2007 16:49:15 +1000 (EST) Subject: Re: [gmx-users] Addition of ions in vacuum simulations > Hi all, > > I am simulating a charged peptide in vacuum. I want to neutralize my > system b

Re: [gmx-users] Addition of ions in vacuum simulations

2007-10-17 Thread Mark Abraham
> Hi all, > > I am simulating a charged peptide in vacuum. I want to neutralize my > system by using genion command,and as expected it asks me a continuous > solvent group for the replacement; however, I have no solvents. > > How can I add ions to my system if I am in vacuum? or Is it necessary to

[gmx-users] Addition of ions in vacuum simulations

2007-10-17 Thread OZGE ENGIN
Hi all, I am simulating a charged peptide in vacuum. I want to neutralize my system by using genion command,and as expected it asks me a continuous solvent group for the replacement; however, I have no solvents. How can I add ions to my system if I am in vacuum? or Is it necessary to add ions