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Reactive oxygen species (ROS) and reactive nitrogen species (RNS, e.g. nitric oxide, NO(*)) are well recognised for playing a… Expand Oxygen-free radicals, more generally known as reactive oxygen species (ROS) along with reactive nitrogen species (RNS) are well… Expand At high concentrations, free radicals and radical-derived, nonradical reactive species are hazardous for living organisms and… Expand The antiradical activities of various antioxidants were determined using the free radical, 2,2-Diphenyl-1-picrylhydrazyl (DPPH… Expand Publisher Summary This chapter discusses the role of free radicals and catalytic metal ions in human disease. The importance of… Expand 1. Oxygen is a toxic gas - an introductionto oxygen toxicity and reactive species 2. The chemistry of free radicals and related… Expand It is now clear that oxygen-derived free radicals play an important part in several models of experimentally induced reperfusion… Expand A free radical is any molecule that has an odd number of electrons. Free radicals, which can occur in both organic (i.e… Expand METHODS for measuring antioxidants and appraising antioxidant activity appear to be of two general types. If the chemical nature… Expand The phenomenon of growth, decline and death—aging—has been the source of considerable speculation (1, 8, 10). This cycle seems to… Expand