JM109 (DE3) Escherichia coli|341823 |BNCC

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Escherichia coli JM109(DE3)

Subculture procedure	① Prepare one test tube containing 5-10 mL of liquid culture medium and two plates; ② Open the safety cabinet, burn the top with an alcohol lamp, quickly drip sterile water to break it, and then use tweezers to crush it; ③ Transfer 0.5mL of liquid culture medium into a freeze-drying tube, dissolve it thoroughly, and then transfer it back into the liquid test tube, mixing well; ④ Transfer 0.2mL of bacterial suspension into a Agar plate, apply evenly, and repeat twice to obtain two plates; ⑤ Place all liquid test tubes and plates under the above cultivation conditions, and the bacterial strains can be used once they grow.
Growth conditions	37 ℃; 18-24h; aerobic;
Storage conditions	2-8 ℃
Safety level	1
morphology	G(-), Bacillus subtilis
Sharing mode	Public welfare sharing

Strain instructions

Strain name: JM109(DE3) Escherichia coli Escherichia coli JM109(DE3)

Storage conditions: 2-8 ℃

Validity : 6 years

No. 341823

Product format: freeze dried, 200ul

Biosafety level: 1 , handle in ultra-clean table or safety cabinet

Uses: competent cells, plasmids, genetic engineering

Receiving notice: if any abnormality is found on the day of receipt, please contact the customer service within 24 hours. Please store at 2-8℃. The freeze dried culture shall be used up once and shall not be retained. Please operate in strict accordance with this instruction, otherwise the replacement of bacteria are not be available in case of aberrant growth and loss of viability.

Medium:LB agar medium yeast extract 5.0g, peptone 10.0g,NaCl 10.0g, agar 15.0g, distilled water 1.0 L,pH 7.0. Sterilization at 121 ℃ for 15min.

Growth conditions

Temperature :37 ℃

Gas environment : Aerobic

How to use
A. Recovery
1. Prepare 2 LB plates;
2. under sterile conditions, draw 0.5mL of liquid culture medium into a lyophilized tube to fully dissolve the freeze dried pellets;
3.inoculate two plates with the liquid suspension, and streak the two plates, in 18-24h a single colony grow ;
B. Competent preparation (for reference)
1. inoculate a test tube of 3ml LB liquid medium with a single colony from JM109(DE3) E. coli plate , and put the test tube on a shaker at 37 ℃ overnight.
2. take 1ml of bacterial solution and transfer it to a conical flask containing 50ml LB liquid culture medium. shake culture at 37 ℃ for 2~3h, A600 should be between 0.4~0.5, and the number of cells must be <108CFU/ml.
3. transfer 1ml of bacterial liquid to a 1.5 ml centrifuge tube with a pipette and place it on ice for 10min.
4. Centrifugation for 10min,4000r /min.
5. suck out all the supernatant and add 200ul of ice-cold CaCl ( 0.1mol/l), then immediately place on ice for 30min.
6. low temperature centrifugation for 10min,4000r /min to collect cells.
7. suspend the cells with 200ul of ice-cold CaCl ( 0.1mol/l).
8. sub-package cells, each 200ul, this is competent cells.

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