The pipetting for this lab was very easy overall, after a few cycles of the pipetting, it became very easy and it was almost like muscle memory.The pre-lab reading aided greatly in understanding the use of lab equipment specifically in the use of the micropipets. The difference between the first stop and the second stop on the micropipetting is the first stop is used to suck up the liquid and the second stop of the pipette is used to shoot the liquid out of the tip of the pipette.The final reactions of the PCR had the same amount of liquid, however the concentration of the DNA within the liquid increased, the actual volume of the liquid did not increase.The tubes appeared to be clean and dry with no visible signs of contamination. We did not have to change our labeling scheme since there were no complications that would have required such an action.
Fluorimeter Procedure
Imaging set-up
To set up our device, a Samsung Galaxy s7, to capture images from the fluorimeter, we had to first set up the camera. The camera's settings were changed to have a film speed, or ISO of 800. Also, the camera flash was inactivated, white balance was changed to auto, exposure and saturation were at its highest setting, and contrast was at its lowest setting. placed the phone on a given smart phone cradle. The smart phone cradle should be at a right angle and positioned where the camera would take images sideways. Next, set the cradle exactly four centimeters away from the drop. From there, pictures can be taken from the fluorimeter.
Placing Samples onto the Fluorimeter
Set the micropipette to 160 microliters and drop 160 microliters of water on the slide. Make sure to position it in the middle first two rows to ensure that the drop looks like a beach ball.
Use a smartphone that has been calibrated to its necessary settings, take three consecutive pictures of the drop.
Dispose of the tip and tray
Set the micropipette to 80 microliters and drop 80 microliters of SYBR Green I in the middle first two rows to ensure that the drop looks like a beach ball.
Add 80 microliters of calf thymus (or water blank)
Adjust the blue LED light to focus on the drop in the middle
Use a smartphone that has been calibrated to its necessary settings, take three consecutive pictures of the drop
Remove the 160 microliter of sample from the surface using a micropipettor
Repeat steps 4-8 for the other concentrations of Calf Thymas DNA
Data Collection and Analysis
Images of High, Low, and Zero Calf Thymus DNA
Calibrator Mean Values
Initial Concentration of 2X
Calf Thymus DNA Solution
(micrograms/mL)
Final DNA Concentration
in SYBR Green 1 Solution
(ug/mL)
Sample Number
RAWINTDEN DROP- BACKGROUND
Image 1
Image 2
Image 3
MEAN
Standard Deviation
5
2.5
C-1
25532876
28695597
28026721
27418398
1666806.433
2
.1
C-2
12026091
12603902
12665434
12431809
352706.4904
1
.5
C-3
18619158
18554353
19162023
18778511.33
333707.6877
.5
.25
C-4
21133802
22926384
22447325
22169167
928093.4751
.25
.125
C-5
19449990
19305835
18617074
19124299.67
445144.4414
0
0
C-6
5673222
5295378
5155843
5374814.333
267680.5105
Calibration curves
Images of Our PCR Negative and Positive Controls
PCR Results: PCR concentrations solved
PCR Product Tube Label
Mean(of RawIntDen drop - background)
PCR Product Concentration
(µg /mL)
(Step 5 Calculation)
Total Dilution
Initial PCR Product Concentration
(µg /mL)
(Step 6 calculation)
PC
10751434.33
-1.313869938
12
-15.76643926
NC
9771507
-1.713477404
12
-20.56172885
1-1
7885116.333
-2.482734237
12
-29.79281084
1-2
8877497.333
-2.078048252
12
-24.93657902
1-3
8614098
-2.185460645
12
-26.22552774
2-1
8421506.667
-2.263998035
12
-27.16797642
2-2
10837873.67
-1.278620584
12
-15.34344701
2-3
9702029.333
-1.741809907
12
-20.90171889
PCR Results: Summary
Our positive control PCR result was -15.7664 μg/mL
Our negative control PCR result was -20.5617 μg/mL
Observed results
Patient 49665: Qualitative: Bubbly beach ball like structure
Patient sample demonstrates a concentration reading that is closer to the negative control than the positive control while remaining consistent.
Patient 36290: Inconclusive
Patient sample demonstrates a concentration reading that is inconsistent with data varying greatly depending on different trials yielding inconclusive results.