sentence: Total biofilm formation ( A ) and bottom biofilm formation on polystyrene plates ( B ) by P. aeruginosa PA14 and the tpbA mutant with either pMQ70 or pMQ70-tpbA in LB with 300 µ g / mL carbenicillin and 0.05 % arabinose after 24 h at 37 ° C. Six wells were used for each culture .