Journal Article Research Support, Non-U.S. Gov't Amino Acids QTAIM electron density quantum crystallography quantum theory of atoms in molecules quantum theory of atoms in molecules (QTAIM) 76I7G6D29C 9007-49-2 Bader's quantum theory of atoms in molecules (QTAIM) Clinton equations Comment Comparative Study DNA Editorial H-H bonding Laplacian of the electron density Morphine N-representability One-electron Bohm quantum potential Pharmaceutical Preparations Polycyclic Aromatic Hydrocarbons Proteins QSAR Research Support, U.S. Gov't, Non-P.H.S. X-ray diffraction adenine-thymine base pair atomic energies biophysical chemistry