This book bridges the gap between advances in basic biology and chemistry and technological applications in the field of toxicity assessments. It describes areas of progress in the laboratory and clinic and discusses aspects of cellular organelles. It also covers the basic principles and applications of modern toxicological tools such as transcriptomic, proteomic, and metabolomic approaches. The recent developments on molecular modeling and systems biology are described with an eye on the future establishment of virtual cell technology. Finally the clinical implications for the understanding of acute and chronic renal toxicity are studied.