quaternary ammonium compounds (qacs) are employed both as disinfectants for manual processing lines and surfaces in the food industry, and in human medicine area. qacs also cause cell death by protein denaturation . one of the qac is cetyl trimethyl ammonium bromide (ctab) that appears to rapture the cell membrane. the primary site of action of ctab has been suggested to be the lipid components...

density functional theory (dft) calculations have been performed to investigating the effects of themolecular oxygen impurity on the quadrupole coupling constant (qcc) parameters of armchair and zigzagboron nitride nanotubes (bnnts). optimization processes have been performed to relax the original andimpure structures of the investigated bnnts. afterwards, the qcc parameters have been evaluated...

* Assisted by the National Science Foundation. Dresselhaus, Kip, and Kittel, Phys. Rev., 98, 368 (1955). 2 Kroemer, H., Phys. Rev., 109, 1856 (1958); also private communication. 3 Similar considerations have been carried out independently by Dr. Peter Kaus of the University of Southern California. Dr. S. Rodriguez of the University of Washington has successfully extended our argument to motion ...