The bioalkylation of heavy elements - an historical introduction, F.Glockling. Part 1 Pathways for methyl transfer: the transfer of methyl groups - a general introduction, R.J.P.Williams; redox chemistry of coenzyme F430, the hydrocorphinoid nickel complex catalyzing methane formation in methanogenic bacteria, B.Jaun; structural effects on cobalt methylation and demethylation of vitamin B12 derivatives, B.Krautler; methyl transfer reactions of cobalt corrinoid (B12) complexes, J.M.Pratt et al; mechanisms for B12-dependent methyl transfer to heavy elements, J.M.Wood. Part 2 Biomethylation of Ge, Sn, Pb, As, Sb, Hg: the biogeochemsitry of methylgermanium species - a review, B.L.Lewis et al; interactions between microorganisms and tin compounds, J.J.Cooney; "in vivo" methylation and detoxication of arsenic, M.Vahter, E.Marafante; arsenic in the marine environment of South Australia, W.A.Maher; biological methylation of the algal trialkylarsine oxides, A.A.Benson; algal excretion of the arsenoribosylglycerol sulphate ester, A.A.Benson; antimony metabolites in marine algae, A.A.Benson; the methylation of arsenic by marine macro-algae, J.S.Edmonds, K.A.Francesconi; transformations of mercury by "saccharomyces cerevisiae", S.Yannai et al. Part 3 Global consequences and toxicology of alkyl transfer: the biological properties of methyl and ethyl derivatives of tin and lead, W.N.Aldridge, A.W.Brown; morphological responses of some common spoilage fungi towards triorganotin compounds, P.J.Newby, G.M.Gadd; global biomethylation of the elements - its role in the biosphere translated to new organometallic chemistry and biotechnology, F.E.Brinckman, G.J.Olson; biogenesis of halomethanes by fungi, D.B.Harper, J.T.G.Hamilton; methylation of poorly soluble metal compounds - some environmental implications, J.S.Thayer; effects of trailkyllead compounds on mitochondrial membrane potential, D.E.Griffiths, J.Usta; what DNA sequence analysis tells us about toxic heavy metal resistances, S.Silver, T.K.Misra. Part 4 Speciation and analysis: metal speciation studies using combined atomic absorption spectrometry and chromatographic techniques, M.Harriot et al; novel methods for the determination of methylated metal species and their application to eustuarine samples, L.Ebdon et al; the analysis of organotin compounds from environmental matrices, J.Ashby et al; anion transport by alkyl derivatives of heavy metals, M.J.Selwyn and A.S.Watling; biomethylation - concluding remarks, R.J.P.Williams.