OurE. coli electrocompetent cells can be used to transform recombinant plasmid DNA into bacterial cells. Transformation of E. coli by electroporation is a reliable method to obtain high transformation efficiencies, generally higher than those achieved by transformation via chemically competent cell techniques. The application of brief, high-voltage electric pulses to cells leads to the formation of pores in the plasma membrane and DNA is then taken directly into the cell cytoplasm through these pores. Experimental time can be saved and electroporation is especially useful in introducing a small amount of sample into the cells.