SEARCH Articles Figures Tables Active oxygen metallo-porphyrin Oxygen sensors, porphyrin-based Oxygen transfer 243 porphyrins Porphyrins catalysts, oxygen production from water Porphyrins hemes, oxygenated Porphyrins oxygen sensors Porphyrins oxygenated cobalt Porphyrins reactions with oxygen Porphyrins, fuel cell oxygen reduction Porphyrins, fuel cell oxygen reduction catalysts