## apbs-users

 [Apbs-users] Calculation of Electric Potential in Vaccuum From: Bob Johnson - 2005-11-05 23:46:21 ```Hello everyone, I'm *brand* new to using APBS. My system consists of a single stranded DNA molecule adsorbed on a carbon nanotube. The system is in vacuum. I want to calculate the electric potential at the surface of the nanotube. Is the Poisson-Boltzmann equation appropriate in this case? To my understanding, the Poisson-Boltzmann equation is for charges distributed in a uniform background charge density. Obviously, when the background charge density is zero, one recovers the normal Poisson equation. Is APBS suited for this type of calculation? Is there anything special I need to consider? Thanks, Bob Johnson ```
 Re: [Apbs-users] Calculation of Electric Potential in Vaccuum From: Ryogo Sugitani - 2005-11-06 23:54:30 ```Hi Bob, If you use ion concetration =3D 0, and dielectric constant of solvent =3D 1= , I think you can calculate what you want with APBS or any poisson-boltzmann solver. Ryogo 2005/11/5, Bob Johnson : > Hello everyone, > I'm *brand* new to using APBS. My system consists of a single stranded DN= A > molecule adsorbed on a carbon nanotube. The system is in vacuum. I want t= o > calculate the electric potential at the surface of the nanotube. Is the > Poisson-Boltzmann equation appropriate in this case? To my understanding,= the > Poisson-Boltzmann equation is for charges distributed in a uniform backgr= ound > charge density. Obviously, when the background charge density is zero, on= e > recovers the normal Poisson equation. Is APBS suited for this type of > calculation? Is there anything special I need to consider? > Thanks, > Bob Johnson > > > > ------------------------------------------------------- > SF.Net email is sponsored by: > Tame your development challenges with Apache's Geronimo App Server. Downl= oad > it for free - -and be entered to win a 42" plasma tv or your very own > Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php > _______________________________________________ > apbs-users mailing list > apbs-users@... > https://lists.sourceforge.net/lists/listinfo/apbs-users > ```