Dioxygen is a highly important, yet toxic, molecule that reacts in vivo to produce reactive oxygen species such as super-oxide, peroxides, hydroxyl radicals, and other related species. Those species play important roles in healthy organisms, and they are implicated in aging and a wide range of disease processes as well. The contents of this Special Feature on Reactive Oxygen Species in Chemistry and Biology represents a sampling of the excellent work that is being carried out at this important interface of chemistry and biology by using a wide range of chemical, kinetic, spectroscopic, and biological approaches. The authors come from several different fields and use a wide diversity of techniques and experimental systems; nevertheless, their studies all relate to the fundamental chemical reactivity of dioxygen and species derived from it.
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