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- Overview
- March-April
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- September-October
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7.29 Mutagen Concentration Test - Sixth Protocol
I) Purpose
- To start modeling phage plaque sizes against several variables including, but not limited to phage particle size, agar concentration, and bacterial concentration.
II) Expected Outcome
- A inverse relationship between phage plaque size and phage particle size/ agar concentration/bacterial concentration.
III) Reagents Used
- LB
- Different stock of E coli strain.
IV) Procedure
1) E coli strain preparation (8.2-8.5)
- We normally use E coli BL21 for our experiments with T7. The large phage group kindly provided the streak of E coli B.
- E coli W3110 and K12 was streaked from frozen glycerol stock and agar stock respectively.
- Because K12 streak from last step didn't work, liquid culture was prepared to amplify bacteria from agar stock. To three test tubes, 1mL of LB was added to each. After this,
- test tube 1: a pipette tip was used to stab the agar stock, after this LB was pipetted up and down to get the agar into LB.
- test tube 2: a wooden stick was used to scrap the agar stock, after which it was submerged in LB
- test tube 3: after preparing test tube 2, the wooden stick used was submerged directly in the LB of test tube 3
2) Phage viability/infection test (8.5)
- - Prepare 2 plates for a spot test using E. coli BL21 by adding 0.5mL overnight into a tube, mixing it with 5mL of x1 top agar, and then plating it. Repeat for E. coli B and E. coli W3110.
- -Spot 5ul each of T1, T3 30, T3 14, T5, and T7 onto one plate of each bacteria. Spot T2 10, T2 50, T4, Phix174 20, and Phix174 40 onto the other plate of each bacteria.
V) Results
1) E coli K12 did not survive on plate or in liquid culture overnight. So we decided to viability/infection of phage with E coli B, BL21, and W3110 instead.
VI) Conclusion
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