title: Selenourea and colloidal selenium: their role in radioprotection and radiosensitization of enzyme and cellular systems.
abstract: The effect of selenourea and of colloidal selenium on dilute aqueous solutions of the enzyme yeast alcoholdehydrogenase and on suspensions of E. coli B/r has been studied. Selenourea usually appears to protect meanwhile colloidal selenium radiosensitizes. The results are considered in terms of chemical stability of selenourea and of its free radical reactivity.
mesh_terms: D000429:Alcohol Oxidoreductases / Q000528:radiation effects; D003102:Colloids / Q000494:pharmacology*; D004798:Enzymes / Q000528:radiation effects*; D004926:Escherichia coli / Q000528:radiation effects; D005609:Free Radicals; D011830:Radiation Effects; D011837:Radiation-Protective Agents; D011838:Radiation-Sensitizing Agents; D012643:Selenium / Q000494:pharmacology*; D014508:Urea / Q000494:pharmacology*; D015003:Yeasts / Q000201:enzymology
chemical_list: D003102:Colloids; D004798:Enzymes; D005609:Free Radicals; D011837:Radiation-Protective Agents; D011838:Radiation-Sensitizing Agents; D014508:Urea; D000429:Alcohol Oxidoreductases; D012643:Selenium