Equipment:

- Heating bath

- Incubator

Chemicals & consumables:

- Ice

- Pipets + steril tips

- LB medium

- LB-Agar-Plates + antibiotics

Procedure:

- Defrost stocks of competent cells (100 µL in 1.5 ml Eppendorf tube) on ice.

Add the DNA and incubate the suspension for 15 minutes on ice.

Heat shock is done by incubating the cells for 45 seconds at 42°C. Put samples back on ice for 2 min.

- Add 1 mL of LB medium and incubate for 1 hour at 37°C in order to obtain antibiotic resistance.

- It might be useful to spin down cells at 5000 rpm for 5 min. Resuspend pellet in 100 µL LB.

- Finally the cells are ready to be spread out.