Shigella toxic Escherichia coli|186739 |BNCC

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Escherichia coli STEC

Subculture procedure	①Prepare 1-2 fresh agar plates with typical bacterial colonies; 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 Take 0.5mL of sterile water and pour it into the freeze-drying tube. After fully dissolving the bacterial powder, mix well; ④ Transfer 0.2mL of bacterial suspension into a Agar plate, apply evenly, and repeat twice to obtain two plates; ⑤ Cultivate under the above conditions, and the strain can be used once it grows.
Growth conditions	37 ℃; 18-24h; aerobic;
Storage conditions	2-8 ℃
Safety level	2
morphology	The colony diameter is 1-2mm, circular, with neat edges, opaque, light color, raised in the middle, smooth surface, moist texture, easy to pick up, G - (red), Bacillus subtilis
Sharing mode	Public welfare sharing

Escherichia coli STEC

Storage conditions : 2~8 ℃

No. : 186739

Product format : freeze dried,200ul

Validity period: 6 years

Biosafety level : 2, handle in safety cabinet

Receiving notice: if any abnormality is found on the day of receipt, please contact the customer service within 24 hours. If it is overdue, it is deemed that the bacteria are well. The freeze dried culture shall be used up once and shall not be retained. The bacterial viability will resume after 1-2 generation of recovery and can be used normally. Handling instructions of agar slant and suspension liquid is enclosed. 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.

Growth conditions :37 ℃, aerobic, nutrient agar medium, 18-24h. Nutritional agar medium: beef paste 3.0g, peptone 10.0g,NaCl 5.0g, agar 20.0g (not included in liquid medium), distilled water 1.0L,pH7.0. 121 ℃,15min.

Recovery steps:

(1) Prepare a test tube containing 5-10mL of liquid culture medium and 2 plates;

(2) Open it in the biosafety cabinet, heat the tip of ampoule in a flame, quickly drop sterile water to creak it, then break it with forceps;

(3) Draw 0.5mL of liquid culture medium into a freeze dried ampoule, fully rehydrate and transfer the solution to the liquid test tube, mix evenly;

(4) Inoculate a plate with 0.2mL of suspension liquid, repeat the step to obtain two plates;

(5) Put all the liquid test tubes and plates under the above culture conditions for cultivation, and the strains can be used when they grow.

Recovery record: According to the recovery instructions, the results of the recovery are reported as follows:

item	test result
viability	good viability, in 20 hours liquid medium become turbid, obvious strain layer occurs on the plate,colony is typical on marked plate.
colony morphology: (above)	size: 1-2mm shape: round edge: irregular transparency: opaque color: yellow uplift: middle convex surface: bright and smooth texture: moist and viscous
conclusion	good viability，no abnormal colony morphology,qualified

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