P.D. Beer, P.A. Gale, and Z. Chen, Electrochemical Recognition of Charged and Neutral Guest Species by Redox-Active Receptor Molecules. L. Eberson, Spin Trapping and Electron Transfer. O. Matsson and K.C. Westaway, Secondary Deuterium Kinetic Isotope Effects and Transition State Structure. M. Blackburn, Catalytic Antibodies. Author Index. Cumulative Index of Authors. Cumulative Index of Titles.