[ccp4bb] areaimol and hydrogens

2014-07-28 Thread Harry Mark Greenblatt
BS"D Dear All, I understood from the areaimol documentation that hydrogens are not included as one of the default atoms. But one can add atoms, and so I added an "ATOM" line for hydrogen. The program quite happily accepted my input line, but later on stated explicitly that it was ignoring

Re: [ccp4bb] areaimol and hydrogens

2014-07-28 Thread Jose Manuel Duarte
I believe that ignoring hydrogen atoms is the default behaviour of any software calculating ASA values. Normally the VdW radii values of the heavy atoms already include the hydrogens implicitly. If your input structure has hydrogens and they were included in the calculation it would result in

Re: [ccp4bb] areaimol and hydrogens

2014-07-28 Thread Nadir T. Mrabet
Jose, Your are most probably right. Atoms used for ASA calculations are "unified atoms" as their vdW radii incorporate light atoms (hydrogens) which, by and large, crystallographers don't see. Adding extra H atoms is likely to end up in miscalculations. Nadir Mrabet Pr. Nadir T. Mrabet Structu

Re: [ccp4bb] areaimol and hydrogens

2014-07-31 Thread Matthias Wilmanns
Will be ready to go in ~ 2 minutes. Matthias On Jul 28, 2014, at 2:20 PM, Jose Manuel Duarte wrote: I believe that ignoring hydrogen atoms is the default behaviour of any software calculating ASA values. Normally the VdW radii values of the heavy atoms already include the hydrogens implici