Transcription of Making Electrocompetent Cells
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Making Electrocompetent Cells Day 1. 1. Streak out frozen glycerol stock of bacterial Cells (Top 10, DH5 , etc.) onto an LB. plate (no antibiotics). Grow plate overnight at 37 C. Day 2. 1. Autoclave: 2 L of ddH2O. 100 mL of 10% v/v glycerol (molecular biology grade). 1 L LB (or your preferred media). 4 centrifuge bottles and caps Lots of microfuge tubes 2. Chill overnight at 4 C: ddH2O. 10% glycerol Centrifuge rotor 3. Prepare starter culture of Cells Select a single colony of E. coli from fresh LB plate and inoculate a 10 mL starter culture of LB (or your preferred media). Grow culture at 37 C in shaker overnight. Notes: You can also substitute other media like SOB, 2xYT, etc for LB if preferred. All glassware should be detergent free. Trace detergent residue reduces competency. Day 3. 1. Inoculate 1 L of LB media with 10 mL starter culture and grow in 37 C shaker.
3. Add 10g Bacto Yeast Extract. 4. Add 5g NaCl. 5. Adjust pH to 7.0 with 5N NaOH. 6. Adjust to 1L with distilled H2O. 7. Sterilize by autoclaving on LIQUID cycle. LB (Luria-Bertani) Broth Recipe 10 grams tryptone 5 grams of yeast extract 10 grams of NaCl (NOTE: A premixed powder is also available from Fisher cat# BP1426) 1. Dissolve in 1 L of ...
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