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Escherichia coli K12

e for 15 minutes and transfer to a prechilled centrifuge bottle. Harvest by centrifugation (20 minutes, 5,000 x g, 2-4 C). Resuspend pellet in 5 ml ice-cold water. Keep the cells cold during the entire procedure. 3. Wash twice with the original culture volume of ice-cold water. Centrifuge as above. Resuspend pellet by swirling in remaining liquid. 4a. If using the cells immediately, place suspension in a prechilled tube and centrifuge (10 minutes, 5,000 x g, 2-4 C). Resuspend the cells in ice-cold water to a final concentration of approximately 2 x 1011 cells/ml. Aliquote 40-300 l cells into prechilled centrifuge tubes. 4b. If freezing the cells for later use, add 40 ml of ice-cold 10% glycerol, mix and centrifuge for 10 minutes, at 5,000 x g and 2-4 C. Resuspend the cells in ice-cold 10% glycerol to a final concentration of approximately, 2 x 1011 cells/ml. Aliquote 40-300 l cells into prechilled centrifuge tubes. quick freeze on dry ice and store at 80 C.

Electroporation of cells:

  1. Add 1 l DNA (10 pg in water) to tubes containing 40 l electrocompetent cells. Homogenize by gently mixing with
    pipette several times.
  2. Transfer mixture to a prechilled cuvette. Wipe moisture from the cuvette and insert the cuvette into the device.
  3. Electroporation:

    Mode Prokaryotes O V
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