Description:Content: Spectroelectrochemical investigation of vitamin B12 and related cobalamins / Harry B. Mark, Jr., Thomas M. Kenyhercz, and Peter T. Kissinger -- Bioelectrochemical modelling of cytochrome c / Charles C.Y. Ting, Joseph Jordan, and Maurice Gross -- Control of the potentials of metal ion couples in complexes of macrocyclic ligands by ligand structural modifications / Daryle H. Busch, Dale G. Pillsbury, Frank V. Lovecchio, A. Martin Tait, Yann Hung, Susan Jackels, Mary C. Rakowski, Wayne P. Schammel, and L.Y. Martin -- Electrochemical studies on the thermodynamics of electron transfer and ligand binding of several metalloporphyrins in aprotic solvents / K.M. Kadish, L.K. Thompson, D. Beroiz, and L.A. Bottomley -- Electrochemical investigations of the redox properties of a n-bridged dimer, [mu]-nitrido-bis[alpha, beta, gamma, delta-tetraphenylporphyriniron], in nonaqueous media / K.M. Kadish, J.S. Cheng, I.A. Cohen, and D. Summerville -- Electrochemically catalyzed reduction of nitrogenase substrates by binuclear molybdenum(V) complexes / Franklin A. Schultz, Debra A. Ledwith, and Louis O. Leazenbee -- Manganese(II) and -(III) 8-quinolinol complexes ; Redox model for mitochondrial superoxide dismutase -- John K. Howie, Mark M. Morrison, and Donald T. Sawyer / Interfacial behavior of biologically important purines at the mercury solution interface -- H. Kinoshita, S.D. Christian, M.H. Kim, J.G. Baker, and Glenn Dryhurst -- Evaluation of mediator-titrants for the indirect coulometric titration of biocomponents / Robert Szentrimay, Peter Yeh, and Theodore Kuwana -- Rotating ring disk enzyme electrode for biocatalysis studies / Ralph A. Kamin, Frank R. Shu, and George S. Wilson -- Electrokinetic potentials in a left ventricle/aorta simulator / Eugene Findl and Robert J. Kurtz -- Differential pulse polarographic analysis for ethylenediaminetetraacetate (EDTA) and nitrilotriacetate (NTA) in phytoplankton media / Richard J. Stolzberg.