The experience with micro pipetting taught us a lot. The pre-lab assignments as well as the tutorials online prepared us well for this lab. They gave us experience with how to work a micro pipetter with confidence. Furthermore, they clearly explained the differences between the first and second stop on the pipette. This allowed us to avoid inconsistencies in our data. It was particularly important in this lab to be able to correctly work a micro pipetter. Our final reactions had an equal amount of liquid so there was not remaining liquid in the DNA and PCR mixture. The tubes were labeled with marker. The tutorials and pre lab materials helped accomplish this. All in all, much was learned about the process of micro pipetting and how to use a fluorimeter.
Fluorimeter Procedure
Smart Phone Camera Settings
Type of Smartphone: Iphone 5 and Iphone 6
Flash: Off
ISO setting: NA
White Balance: NA
Exposure: High
Saturation: High
Contrast: Low
Camera set-up
Our camera was placed into the cradle and lifted
Distance between the smart phone cradle and drop = 5.5 cm
Placing Samples onto the Fluorimeter/Taking Fluorimeter Measurements
Put on gloves and find the smooth side of the glass slide
Turn on the fluorimeter
Place slide in the fluorimeter smooth side down
Set cellphone camera for 3 seconds and place in the cradle
Adjust height of fluorimeter so that the camera will take a picture of the slide edge-on
Place an 80uL drop of the SYBR Green I solution on the first two clear circles in the middle of the slide
Place an 80uL drop of the sample/calibration solution directly on top of the SYBR Green I solution
Move the slide around until the light hits the drop and focuses the light on the other side
Adjust the distance between the smartphone and the fluorimeter so that is is greater than 4cm away but not blurry. Record set distance.
Cover with lightbox and check that the camera is focused
Press camera button and lower flap before picture it taken
Discard liquid drop
Move slide to the next position
Repeat steps 1-14 with all 5 possible measurement positions.
Data Collection and Analysis
Images of High, Low, and Zero Calf Thymus DNA
High Calf Thymus DNA
Low Calf Thymus DNA
Zero Calf Thymus DNA
Calibrator Mean Values
Initial Concentration of 2x Calf Thymus DNA solution (µg/mL)
Final DNA Concentration in SYBR Green I solution (µg/mL)
Sample #
RAWINTDEN Drop - Background
Mean
Std Dev
Img 1
Img 2
Img 3
5
2.5
G-1
18678998
17876541
19128456
18561332
634198
2.5
1.25
G-2
12562821
13982346
11287635
12610934
13480000
1
.5
G-3
11783472
10236814
9126734
10382340
1334334
.5
.25
G-4
8345724
8178942
7976254
8166973
185026
.25
.125
G-5
5422637
6134876
5798234
5785249
356297
0
0
G-6
2634578
2390456
2623987
2549674
137988
Calibration curves
Images of Our PCR Negative and Positive Controls
Postive
Negative
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)"
G1+
9254872
1.2134
12
14.5608
G1-
4325825
5.5772
12
66.9264
G1 1-1
3924573
5.8829
12
70.5948
G1 1-2
4182736
5.7621
12
69.1452
G1 1-3
4623549
5.2734
12
63.2808
G1 1-4
3789251
6.2473
12
74.9676
G1 1-5
4489745
5.4905
12
65.886
G1 1-6
4872369
4.9235
12
59.082
PCR Results: Summary
Our positive control PCR result was 14.5608 μg/mL
Our negative control PCR result was 66.9264 μg/mL
Observed results
Patient 31801: After combining the SYBR green and the patient's PCR sample, it was evident that the patient was negative. No visible sign of green was detected through the fluorimeter or ImageJ.
Patient 21190 : The second patient also came up as negative after the test. The fluorimeter and ImageJ did not detect any sign of green within the sample.
Conclusions
Patient 31801 : Negative
Patient 21190 : Negative
Based on the results of the PCR product concentrations, we found that patients 31801 and patient 21190 were both negative for the disease. No green appeared in the pictures from the fluorimter in either patient so this is how the conclusion was reached that both patients were negative.