Free radicals organic semiconductors altzheimers superoxide ros reperfusion uric acid urate ascorbate ascorbic injury peroxide catalase sod superoxide dismutase parkinsonism parkinson's disease organic semiconductor polyacetylene amorphous inflammation antioxidant spin trap label tempo tempol dementi a deafness psychosis homocystinuria homocysteine thiolactone cancer treatment redox signaling messenger active oxygen deafness inner ear cis platinum adriamycin pbn nxy-059 astrazenica electron transfer hydroxyl radical catalase peroxidase anticancer high conductivity alcaptonuria phenothiazine dopa uric acid lesch-nyhan manganese hempchromatosis iron copper porphyriaskin care hair loss treatment .