Abstract
The spin restriction predisposes dioxygen to a univalent pathway of reduction. Superoxide (O -2 ), the first intermediate encountered on this univalent pathway, is consequently a commonly encountered product of dioxygen reduction. The finding that O -2 is produced by some enzymes and is efficiently scavenged by others (McCord and Fridovich, 1968, 1969) led to the view that O -2 is an agent of oxygen toxicity. In this view the superoxide dismutases (SODs), which catalytically scavenge O -2 , serve a defensive role (McCord et al., 1971), much as do catalases vís a vís H2O2. Given the early association of O -2 with radiation chemistry and its extensive study by pulse radiolysis (Czapski, 1971), the biological relevance of O -2 was not easily accepted.
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Fridovich, I. (1993). Getting Along With Oxygen. In: Tarr, M., Samson, F. (eds) Oxygen Free Radicals in Tissue Damage. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4615-9840-4_1
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DOI: https://doi.org/10.1007/978-1-4615-9840-4_1
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