2642390 elec electric shear strength, tau 2 2642389 elec electrostatic 1 2642393 elec electrostatic component E 1 2642394 elec electrostatic twist rigidity of DNA is found to be C 1 2642391 elec experimental information and our SAC/SAC-CI results indicate that O 1 2642392 elec two-electron transfers occur, respectively, to the O 1