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In situ monitoring of the growth of E. coli strain TOPO10 transformed with plasmid pBAD/Bxa1 or pBAD/Myc-His B (vector control) in LB medium supplemented with a variety of metal salts and 0.0002% l-arabinose. (A) Zn; (B) Cd; (C) Ag; (D) blank control without metal ions. The growth rates of strains were monitored on line by Biosystem C at an absorbance of 600 nm for 24 h.
