Lidstrom:Competent Cell Preparation: Difference between revisions
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(New page: Back to Protocols ==Chemically Competent E. Coli== Notes: *You need fresh cells. **Often people inoculate a few mL of the culture for overnight growth, then use 20...) |
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*You need fresh cells. | *You need fresh cells. | ||
**Often people inoculate a few mL of the culture for overnight growth, then use 200 uL to inoculate the ~50 mL of culture they will make competent. | **Often people inoculate a few mL of the culture for overnight growth, then use 200 uL to inoculate the ~50 mL of culture they will make competent. | ||
**Some people in our lab believe you want to start with a fresh plate and don't even use one that is a few days old. Other people (Mila) are mostly concerned about the OD being right at the time of harvest. | **Some people in our lab believe you want to start with a fresh plate and don't even use one that is a few days old. Other people (Mila) are mostly concerned about the OD being right at the time of harvest. | ||
*You need to flash freeze the cells at the end of the procedure. You can do this by pouring liquid nitrogen over them, or you can freeze your tubes at -80oC the night before, put your aliquots in, and stick them back at -80oC. | |||
==ElectroCompetent E. Coli== | ==ElectroCompetent E. Coli== | ||
*This is not done frequently in our lab. | *This is not done frequently in our lab. | ||
Revision as of 15:34, 10 April 2012
Back to Protocols
Chemically Competent E. Coli
Notes:
- You need fresh cells.
- Often people inoculate a few mL of the culture for overnight growth, then use 200 uL to inoculate the ~50 mL of culture they will make competent.
- Some people in our lab believe you want to start with a fresh plate and don't even use one that is a few days old. Other people (Mila) are mostly concerned about the OD being right at the time of harvest.
- You need to flash freeze the cells at the end of the procedure. You can do this by pouring liquid nitrogen over them, or you can freeze your tubes at -80oC the night before, put your aliquots in, and stick them back at -80oC.
ElectroCompetent E. Coli
- This is not done frequently in our lab.
