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Team:Glendale CC AZ/Protocols/NaCl
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Latest revision as of 02:34, 28 September 2013
Glendale Community College Arizona
Protocols
Growth Curve Assay
NaCl Growth Curve Assay
Survival Growth Assay
Alkaline Lysis Plasmid Miniprep
Restriction Digest
DNA Isolation
Bioinformatics
Ligation
Transformation
NaCl Stress Growth Assay
Purpose: To measure bacterial growth with NaCl as DNA damaging agent
Materials:
-5 spec tubes
-Spectrophotometer
-Incubator at 37ºC
-Micropipette
-Disposable micropipette tips
-E. coli in LB media
-NaCl
- 250 mM IPTG
Procedure:
1. Grow E. coli in LB liquid media until stationary phase.
2. To 4 separate spec tubes add:
-1st: 5 mL of LB media
-2nd: 5 mL of LB media supplemented with NaCl to a final concentration of 0.65 M NaCl
-3rd: 5 mL of LB media supplemented with IPTG
-4th: 5 mL of LB media supplemented with IPTG and NaCl to a final concentration of 0.65 M NaCl.
3. Add 300 uL of bacterial liquid culture to each of the tubes. Use parafilm to seal them in order to minimize contamination.
4. Add 5.3 mL of LB media to the last spec tube which will be use to blank the spectrophotometer. Seal with parafilm.
5. Use Kimwipes to clean any prints or smear on the spec tubes. Invert each tube twice before placing in spectrophotometer.
6. Blank the spectrophotometer. Read absorbance of each spec tube.
7. Incubate all tubes at 37ºC for 3 hours.
8. Repeat steps 6-7 after 24 hours.
