BL21 chemocompetent cells|392231 |BNCC

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BL21 Chemically Competent Cell

Culture medium	BNCC352243
Description	LB nutrient agar
Composition	Yeast Extract:5.0g, Peptone:10.0g, NaCl:10.0g, Agar:15.0g, pH:7.0±0.2(25℃)
Growth conditions	37 ℃; 18-24 hours; aerobic;
Subculture procedure	1. Place the competent cells in ice to melt (or let go of the heart or room temperature for a moment, quickly insert into the ice when the bacterial cells are in a mixed state of ice and water), add the target DNA (plasmid or ligation product) and gently mix by hand at the bottom of the EP tube. Let it stand on ice for 25 minutes. Heat shock in a 2.42 ℃ water bath for 45 seconds, quickly place it back on ice and let it stand for 2 minutes. Shaking will reduce the conversion efficiency. 3. Add 700 μ l of antibiotic free sterile culture medium LB to the centrifuge tube, mix well, and resuscitate at 37 ℃ and 200 rpm for 60 minutes. Centrifuge at 4.5000rpm for one minute to collect the bacteria. Take about 100 μ l of supernatant and gently blow and resuspend the bacterial blocks onto LB medium containing the corresponding antibiotics. 5. Invert the plate and incubate overnight in a 37 ℃ incubator. If performing blue and white spot screening operation, incubate the plate at 37 ℃ for at least 17 hours.
Storage conditions	-80 ℃
Sharing mode	Public welfare sharing