Biosynthesis of organometallic and organometalloidal compounds / Frederick Challenger -- Biotransformations of sulfur as evolutionary prototypes for metabolism of metals and metalloids / George E. Parris -- Occurrence of biological methylation of elements in the environment / Y.K. Chau and P.T.S. Wong -- Kinetic and mechanistic studies on B12-dependent methyl transfer to certain toxic metal ions / Y.-T. Fanchiang, W.P. Ridley, and J.M. Wood -- Aqueous chemistry of organolead and organothallium compounds in the presence of microorganisms / F. Huber, U. Schmidt, and H. Kirchmann -- Bioorganotin chemistry : stereo- and situselectivity in the monooxygenase enzyme reactions of cyclohexyltin compounds / Richard H. Fish, John E. Casida, and Ella C. Kimmel -- Anaerobic and aerobic alkylation of arsenic / Barry C. McBride, Heather Merilees, William R. Cullen, and Wendy Pickett -- Arsenic uptake and metabolism by the alga Tetraselmis chui / N.R. Bottino, E.R. Cox, K.J. Irgolic, S. Maeda, W.J. McShane, R.A. Stockton, and R.A. Zingaro -- The chemistry of organometallic cations in aqueous media / R. Stuart Tobias -- Organosilanes as aquatic alkylators of metal ions / Richard E. Desimone -- Influence of environmental parameters on transmethylation between aquated metal ions / K.L. Jewett, F.E. Brinckman, and J.M. Bellama -- Demethylation of methylcobalamin: some comparative rate studies / John S. Thayer -- Mechanisms for alkyl transfers in organometals / Jay K. Kochi -- Pathways for formation of transition metal-carbon bonds in protic media / James H. Espenson -- Unstable organometallic intermediates in a protic medium / James H. Weber and Mark W. Witman.