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Streptococcus salivarius

n. 4. Resuspend in electroporation solution to a 50-fold concentration and freeze in an ethanol-dry ice bath. Store at -80 C.

Electroporation of cells:

  1. Thaw cells on ice. Add 1 g plasmid DNA to 100 l of electrocompetent cells. Homogenize by gently mixing with pipette several times. Transfer mixture into a prechilled cuvette.
  2. Wipe moisture from the cuvette and insert the cuvette into the device.
  3. Electroporation:

    Mode Prokaryotes O Voltage (V) 1,600 V Time constant (T) 5 ms
  4. Add 1 ml ice-cold outgrowth medium and incubate for 3 h at 37 C.
  5. Plate aliquots onto selective agar plates; incubate 2-3 days at 37 C.
Expected Results: Transformation efficiency up to 1 x 105 transformants/g of DNA.


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