FUNDAMENTAL PRINCIPLES: Risk Assessment in Environmental Contamination and Environmental Health: Michael Moore; The Role of Chemical Separation in Bioavailability: S�bastien Suav�; Bioavailability of Metals in the Soil-plant Environment and its Potential Role in Risk Assessment: R. Naidu et al.�INDICATORS OF BIOAVAILABILITY: Microbial Parameters as Indicators of Toxic Effects of Heavy Metals on the Soil Ecosystem: Phil Brooks; Metal-Algae Interactions: Implications of Bioavailability: M. Megharaj et al.; Absorption and Translocation of Chromium by Plants: Plant Physiological and Soil Factors: R.H. Loeppert et al.�CASE STUDIES: Effects of Mine Wastewaters on Freshwater Biota in Tropical Northern Australia: Scott J. Markich et al.; Inplace Inactivation and Natural Ecological Restoration Technologies (IINERT): W.R. Berti and J.A. Ryan; An Assessment of the Revegetation Potential of Acidic Basemetal Tailings using Metal-tolerant Grass Species and Lime: W.J. Morrell et al.; Groundwater Arsenic Contamination in West Bengal--India and Bangladesh: Case Study on Bioavailability of Geogenic Arsenic: Uttam Kumar Chowdhury et al.; Plant Soil Metal Relationships from Micro to Macro Scale: K. Bujtas et al.