Volume 12, Number 7—July 2006
Dispatch
Replicon Typing of Plasmids Encoding Resistance to Newer β-Lactams
Figure

Figure. Restriction enzyme analysis of plasmids analyzed in this study. Numbers and letters above each lane indicate strain reference names as defined in the Table. M is the1-kb Plus DNA ladder (Gibco-BRL, Gaithersburg, MD, USA). Plasmids were transferred by conjugation or transformation in Escherichia coli K12 strains and purified by Midi-prep purification kit. Plasmids were digested with restriction endonuclease PstI and separated by agarose (1%) gel electrophoresis in 1× TBE buffer. DNA was stained with ethidium bromide and visualized under UV light. The replicons and the β-lactamase genes carried by each group of plasmids are indicated below the figure.