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Some chemical and biological properties of intermediates obtained during reduction of nitroimidazoles are discussed. These include: rate data for the decay of the nitro radical-anion, stoichiometry and absorption spectra for reduction via the radical-anion or using dithionite, stoichiometry with other reducing agents, and rate of reduction by xanthine/xanthine oxidase. Increased radiosensitization by misonidazole is seen upon prolonged pre-irradiation incubation using E. coli, enabling demonstration that a freely-diffusable metabolite is responsible for this effect. Preliminary experiments designed to extend studies of the radiobiological properties of extracellularly-added metabolites to mammalian cells and the use of liver perfusion to generate metabolites are described.
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