This volume discusses questions of free-radical biology and new, modern directions in molecular cytobiology; proteomics and genomics. The book presents articles and reviews on bioantioxidants, synthesis of new compounds, mechanisms of their action and areas of application. Studies on free radical states using ESR technique, biochemistry of regulatory systems and the role of free radicals in radiation disease and cancer development are given special attention. Test results of new drugs for curing malignant tumors and kinetic approaches to the description of disease development and estimation of curative action of medicinal preparations are shown. The book also presents studies in the branch of enzymology, receptor systems, photoreception, in particular. The volume uniquely presents general tendencies in chemistry, biology and medicine kinetically united and attached to free radical mechanisms and other questions under consideration.