On Jan 3, 2006, at 8:53 a, Herbert J. Bernstein wrote: > The logic used by RasMol for H-bonds is as follows. I would be happy > to add alternate approaches, but this one will remain the default > so as not to mess up existing scripts: > > Quoting from the Sayle-Martz RasMol FAQ > > "For protein, regions of alpha helix or beta-sheet are identified by > application of the algorithm of Kabsch and Sander. Hydrogen bonds are > assigned when a distance-dependent electrostatic energy of > interaction between donors and acceptors falls below a threshold > value. No reference is made to phi or psi angles. > why doesn't RasMol use dihedral angles in hbond calculations? tim -- Timothy Driscoll em: molvisions at mac.com molvisions - see. grasp. learn. ph: 919-368-2667 <http://www.molvisions.com/> im: molvisions usa:virginia:blacksburg tx: molvisions at vtext.com