Superoxide dismutase (SOD) and catalase activity in E. coli MG1655 at 30% and 300% dO
. (A) SOD and (B) Catalase activity in a batch culture (C) SOD and (D) Catalase activity in a glucose-limited continuous culture (D = 0.5 h-1). The arrows indicate when dO2 was increased from 30% to 300%. Error bars represent standard deviations between triplicate analyses of the same sample.