1.Thaw frozen DH5a competent cell by holding the tube in your hand until cells thaw.
2.Transfer the tube on ice for at least 10 min.
3.Add 10 microliter of recombinant plasmid into chilled competent cell and swirl gently to mix their content. store the mixed tube on ice for 30 min.
4.Transfer the tube onto water bath that set temperature at 42 c for 2 min.
5.rapidly transfer the tube onto the ice to chill the cell for 2 min.
6.Add 800 microliter of LB medium to the tube.
7.pipet all in the tube into fresh tube 15 ml containing 1 ml of LB medium.
8.Add 40 microliter of 1 M glucose and incubate the tube in incubator shaker at 37 c 200 rpm for 45 min.
9.Transfer 200-500 microliter of transformed competent cell onto LB agar containing kanamycin 10 µg/ml and gently spread the transformed competent cell over the surface of the agar plate by using a sterile bent glass rod until the liquid has been absorbed.
10.invert the plate and incubate at 37 c overnight.