Testing Competent Cells (03/07/16)
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We performed a transformation to test our antibiotics and to test our competent cells before we began. We used a PViB plasmid for our transformation, because PViB will cause the cells to glow, which is a easy way to see if our cells accepted the PViB plasmid in transformation. However, in transformation, bacteria grew on the control plate and the experiment plate. The bacteria shouldn't have grown on the control plate because the control bacteria don't have the plasmid. Along with PViB, the plasmid has an ampicillin resistance and our plates have ampicillin. Our control bacteria shouldn't have grown because they don't have the ampicillin resistance and shouldn't have grown on a plate with ampicillin. We didn’t know what it was due to, so we did another transformation to see what went wrong. We used nine plates. The first two plates were a repeat of the original transformation experiment. The next three plates had ampicillin added on top of the plates, because one thing that might have gone wrong in the original experiment was that the ampicillin might not have been distributed throughout the whole plate. However, the bacteria without the resistance plasmid grew on all five plates, meaning that our ampicillin doesn’t work. We also used two plates with Chloramphenicol, another antibiotic, and bacteria grew on the plate with PViB and not on the control plate, meaning that the Chloramphenicol is viable. Finally, we did two plates with DH5α, a type of competent cell, and no PViB gene, and bacteria grew on both plates, further confirming that our ampicillin doesn’t work.
Practice Transformation and Electrophoresis
Practice Electrophoresis
Growing an E-Coli Culture
03/24/16
We needed competent cells to use in our transformation. To make competent cells, we need an E-coli culture. So we used old competent cells in a freezer and tried to grow them up an LB plate. However, nothing grew on the plates.
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LB Swab Plate
03/28/16
The E-coli cells didn't grow, so we wanted to check that the reason that they didn't grow was because the LB plates were bad. To check this, we swabbed several unsterile areas around the lab and put it on an LB plate. There was growth so we know that our LB plates are still good.
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Regrowing Competent Cells
03/28/16
Our competent cells didn't grow on an LB plate so we checked whether or not the competent cells could still grow, or if they were dead. The cells did grow in the nutrient broth, so now we can make them competent.
Making Cells Competent
03/30/16
We used the cells that grew in the nutrient broth and made those cells competent.
Transforming Competent Cells with PViB
03/31/16
We used the competent cells from yesterday and transformed them with the PViB gene.