Atmospheric Transport of Metals. The Marine Biogeochemistry of Iron. Speciation and Bioavailability of Trace Metals in Freshwater Environments. Bioavailability and Biogeochemistry of Metals in the Terrestrial Environment. Heavy Metal Uptake by Plants and Cyanobacteria. Arsenic in Groundwater. Anthropogenic Impacts on the Biogeochemistry and Cycling of Antimony. Microbial Transformations of Radionuclides: Fundamental Mechanisms and Biogeochemical Implications. Biogeochemistry of Carbonates: Recorders of Past Oceans and Climate