Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Effects of subinhibitory amounts of copper ions (0 to 2 mM) on the resistance of E. coli strains MG1655 (A) and MS8485 (B) to β-lactam antibiotics, as determined by disc diffusion assays. Diameters of the zones of clearance were averaged from three independent replicates. Error bars represent SDs. The diameter of the discs was 7 mm, and a value of <7 mm indicated that no zone of clearance was observed around the disc.
