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This work studied the susceptibility of biofilm produced by E. coli to oxidative stress, and compared the components of free radicals defences: level of glutathione, catalase and dismutase activities in planktonic and biofilm located cells. Results showed the diversity of responses to oxidative stress in bacterial cells in log or stationary phases in both planktonic and biofilm forms. The bacteria were exposed to free-radical donors (H 2 O 2 , tBOOH, menadione, SIN-1 or peroxynitrite) in a widedoi:10.1590/s1516-8913201500356 fatcat:snllk7qq7rghzg2y7w4bkx2qmq