BME100 f2013:W900 Group13 L5

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Contents

OUR TEAM

Name: Tyler Angell
Name: Tyler Angell
Name: Reem Gerais
Name: Reem Gerais
Name: Andrew Luc
Name: Andrew Luc
Name: Allison Marley
Name: Allison Marley
Name: Cory Riecken
Name: Cory Riecken


LAB 5 WRITE-UP

Background Information

SYBR Green Dye
SYBR Green Dye is a reagent used to stain DNA. After combining the SYBR Green dye with a double stranded DNA (Single stranded DNA works as well, but produces less effective results), the solution will be able to absorb blue light and emit green light. By measuring the green light, one will be able to measure how much DNA is present in the solution.


Single-Drop Fluorimeter

Image:Singledropfluorimeter.jpg
The single-drop fluorimeter device is a box that emits a blue light. A slot is present on the device for a glass slide to be placed on. Droplets of the SYBR Green dye and DNA solutions are placed on the glass slide for the light to be passed through.

How the Fluorescence Technique Works

The fluorescence technique works by combining a fluorescent dye to the DNA. In this lab, SYBR Green dye was used as the fluorescent dye. The droplets will remain in place due to the Teflon coated glass. A beam of blue light is emitted from the single-drop fluorimeter and is passed through the droplet. A fluorescent green light will be emitted from the droplet which will be measured by taking a picture on a smartphone and analyzing the picture file on ImageJ.



Procedure

Smart Phone Camera Settings
Phone: Galaxy S3

  • Flash: Off
  • ISO setting: 800
  • White Balance: Auto
  • Exposure: Maximum
  • Saturation: Maximum
  • Contrast: Minimum

Calibration

Image:Setup.jpg

1. Adjust the camera settings on the smart phone so that they match the settings above.

2. Place smart phone in the cradle.

3. Make sure that the distance from the smart phone and the cradle is 11 cm.

Solutions Used for Calibration

Calf Thymus DNA Concentration (Microg/ml) Volume of the 2X DNA Solution (ul)Volume of the SYBR GREEN I Assay (ng/mL)Final DNA Concentration in SYBR GREEN I Assay (ng/mL)
580802.5
280801
180800.5
0.580800.25
0.2580800.125
08080blank


Placing Samples onto the Fluorimeter

  1. Before the sample can be placed on the Fluorimeter, the fluorimeter must be set up. This is done by first by placing the glass down on the fluorimeter; the glass must be placed so that the rough side is faced up. The fluorimeter must be turned on. Adjust the glass slide so that the blue light shines in the center of two rows. The hieght of the fluorimeter may need to be adjusted so that the camera has a clear view of the light.
  2. For the next steps, the micropipet will be needed. Begin by adjusting the volume on the micropipet to 80μL, and placing a new micropipet tip on the micropipet.
  3. Use the micropipet to gather 80μL of the SYBR Green I to be placed on the slide. The SYBR Green I will be placed on the glass slide for each sample. Be sure that the camera settings are all in place and take photograph of solely SYBR Green I, this is your blank.
  4. Next, use the micropipet to gather 80μL of the first sample, 0.25, and place it into the 80μL SYBR Green I present on the slide. Be sure that the light from the fluorimeter is in line with the droplet.
  5. Photograph the sample and SYBR Green I.
  6. Remove sample from slide with micropipet and repeat steps for each sample. After all samples have been collected (0,0.25,0.5,1,2,5) repeated this process two more times for a total of three pictures per sample.


Data Analysis

Representative Images of Samples


Sample with no DNA
Image:owwnodnareal.jpg

Sample with DNA
Image:owwdna.jpg


Image J Values for All Samples

Calf Thymus DNA concentration (Final), Microg/mlAREAMean Pixel ValueRAWINTDEN OF THE DROPRAWINTDEN OF THE BACKGROUNDCorrected INTDEN
02333225.47259429567498526797
02217230.49267605476231599823
02421015.19146778860278407510
0.1253678413.70954237149735492636
0.1252298616.1237054151296319245
0.1252147210.89933402320721313302
0.252482466.0661640022248891615133
0.252306074.4971728268690041659264
0.252153061.4851323755357551288000
0.52157280.42138451567432081708
0.52633676.749102127347896973377
0.52544895.741636374547791581595
12179697.7932151322607432090579
123734126.1991995195743211920874
127404119.2562268082798322188250
2.522144129.4783512864895433423321
2.523589175.59541420911015634040528
2.526342131.3373459687816643378023

Fitting a Straight Line

Image:BeforeCorrection.jpg Image:AfterCorrection.jpg



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