Difference between revisions of "Team:RDFZ-China/Description"

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             <img src="https://static.igem.org/mediawiki/2017/5/57/RDFZ_logo.png" />
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                     <a href="https://2018.igem.org/Team:RDFZ-China/Description">PROJECT </a>
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                     <a href="https://2017.igem.org/Team:RDFZ-China/Description">PROJECT </a>
 
                     <ul>
 
                     <ul>
 
                         <li><a href="https://2018.igem.org/Team:RDFZ-China/Description">BACKGROUND</a></li>
 
                         <li><a href="https://2018.igem.org/Team:RDFZ-China/Description">BACKGROUND</a></li>
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                <div class="numbertext">1 / 3</div>
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                <img src="https://static.igem.org/mediawiki/2018/d/dd/T--RDFZ-China--TempHomepageimprovedtwice.jpg"  style="width:100%">
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                <div class="numbertext">2 / 3</div>
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<img src = "https://static.igem.org/mediawiki/2018/8/8e/T--RDFZ-China--InterLab2.jpg" alt = "Spread plates" width="100%">
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                <div class="numbertext">3 / 3</div>
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      <h1 style = "text-align: center">InterLab</h1>
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                <img src="https://static.igem.org/mediawiki/2018/c/c1/T--RDFZ-China--Project_Mindmapimproved.png" style="width: 100%">
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<div>
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                <a class="prev" onclick="slides.prev();" onmouseenter="slides.clearInterval();" onmouseleave="slides.setInterval();">❮</a>
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<h1>Introduction: What is InterLab</h1>
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                <a class="next" onclick="slides.next();" onmouseenter="slides.clearInterval();" onmouseleave="slides.setInterval();">❯</a>
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<p>Reliable and repeatable measurement is key to synthetic biology. It is essential for a standard protocol to be established so that the same measurements can be repeated in different labs. This year's interlab study is aimed to reduce the variability of cell count measurements by replacing OD600 measurement which varies between labs with directly counting of colony forming units (CFU) to determine the number of cells in each sample. Then the mean GFP expression level by each cell can be determined by dividing the already standardized GFP expression level of the sample by the number of cells in that sample.
−
                </div>
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<br>
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                <br>
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<br>
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This is the 5th year of InterLab and we have the following question:
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<br>
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                  <span class="dot" onclick="slides.change(0);" onmouseenter="slides.clearInterval();" onmouseleave="slides.setInterval();"></span>
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                  <span class="dot" onclick="slides.change(2);" onmouseenter="slides.clearInterval();" onmouseleave="slides.setInterval();"></span>
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Can we reduce lab-to-lab variability in fluorescence measurements by normalizing to absolute cell count or colony-forming units (CFUs) instead of OD?
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                </div>
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</font>
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</p>
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<section class="description">
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<p>
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</p>
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<div>
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</section>
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<h1>Materials</h1>
 +
<p>DNA/Plasmids</p>
 +
<ol>
 +
<li>Negative Control: BBa_R0040</li>
 +
<li>Positive Control: BBa_I20270</li>
 +
<li>Test Device 1: BBa_J364000</li>
 +
<li>Test Device 2: BBa_J364001</li>
 +
<li>Test Device 3: BBa_J364002</li>
 +
<li>Test Device 4: BBa_J364007</li>
 +
<li>Test Device 5: BBa_J364008</li>
 +
<li>Test Device 6: BBa_J364009</li>
 +
</ol>
 +
<p>Apparatus</p >
 +
<ul>
 +
<li>96 well plates (provided by Peking University)</li>
 +
<li>Plate reader</li>
 +
<li>Foil covered 50 ml tube</li>
 +
<li>Eppendorf tubes</li>
 +
<li>Pipettes</li>
 +
</ul>
 +
<p>Materials</p>
 +
<ul>
 +
<li>LUDOX CL-X</li>
 +
<li>Silica beads</li>
 +
<li>Fluorescein</li>
 +
<li>Phosphate buffered saline</li>
 +
<li>LB media</li>
 +
<li>Chloramphenicol</li>
 +
<li>LB plates</li>
 +
<li>distilled water</li>
 +
</ul>
 +
</div>
 +
 +
<div>
 +
<h1>Protocols</h1>
 +
<div>
 +
<p> We followed the protocol provided by iGEM HQ so that inter-laboratory errors can be reduced. Protocols we used can be found here:</p>
 +
<a href = "https://static.igem.org/mediawiki/2018/0/09/2018_InterLab_Plate_Reader_Protocol.pdf"> 2018 InterLab Plate Reader Protocol</a><br>
 +
<a href = "http://parts.igem.org/Help:Protocols/Transformation">Help: Protocols/Transformation</a>
 +
</div>
 +
<div>
 +
<p>During the first day, we resuspended DNA from distribution kit <em>(Kit Open Day!)</em> and transformed the plasmids into <i>Escherichia coli</i> DH5<i>α</i> competent cells.</p>
 +
<img src = "https://static.igem.org/mediawiki/2018/6/6b/T--RDFZ-China--InterLab1.jpeg" alt = "Open Distribution Kit" style = "width: 30%">
 +
</div>
 +
<div>
 +
<p>For the second day, firstly we picked single colonies from transformation plates and prepared overnight cultures; we also finished particle and fluorescence calibration.</p>
 +
<img src = "https://static.igem.org/mediawiki/2018/6/6f/T--RDFZ-China--InterLab5.jpeg" alt = "Add silica beads to 96 well plate" style = "width: 30%">
 +
</div>
 +
<div>
 +
<p>The third day was fairly occupied.</p>
 +
<ol>
 +
<li>Overnight cultures were collected for assays. Essentially, each culture was diluted into same starting Abs readings and incubated for 6 hours. Samples were taken at the starting time and after 6 hours. Abs and fluorescence readings were measured for each sample and then imported into excel file.</li>
 +
<li>While we were waiting for incubation, we diluted the starting sample culture for Colony Forming Units protocols and spread 36 LB plates.</li>
 +
<li>We nearly forgot to calibrate OD reference points at the end of the day!</li>
 +
</ol>
 +
<img src = "https://static.igem.org/mediawiki/2018/8/8e/T--RDFZ-China--InterLab2.jpg" alt = "Spread plates" width = "30%">
 +
<img src = "https://static.igem.org/mediawiki/2018/d/d0/T--RDFZ-China--InterLab3.jpeg" alt = "Add cultures to 96 well plate" width = "30%">
 +
<img src = "https://static.igem.org/mediawiki/2018/8/83/T--RDFZ-China--InterLab4.jpeg" alt = "With the PLATE READER!" width = "30%">
 +
</div>
 +
<div>
 +
<p>At last, we counted the colonies <em>(colony forming units)</em> in those 36 plates. It was just an exhausting process!</p>
 +
</div>
 +
</div>
 +
 +
<div>
 +
<h1>Results</h1>
 +
<p><i>The results are shown in the tables and figures.</i></p>
 +
<h2>Calibrations</h2>
 +
<div class="inlabdiv">
 +
<p>OD<sub>600</sub> reference point:</p>
 +
<img src = "https://static.igem.org/mediawiki/2018/0/0a/T--RDFZ-China--OD600_Reference_Point.png" alt = "OD600 Reference Point" style = "width: 30%"><br>
 +
<font size = "1">Table 1. OD600 Reference Point.</font>
 +
</div>
  
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<section class="flowchart">              
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<div class="inlabdiv">
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<!--<img src="https://static.igem.org/mediawiki/2018/3/3a/T--RDFZ-China--flowchart.png" />-->
+
                                <p>Particle Standard Curve</p>
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</section>       
+
<img src = "https://static.igem.org/mediawiki/2018/7/76/T--RDFZ-China--Fluorescein_Standard_Curve.png" alt = "Fluorescein Standard Curve" style = "width: 50%"><br>
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</main>
+
<font size = "1">Figure 1. Particle Standard Curve.</font>
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<footer id="f">
+
</div>
 +
<div class="inlabdiv">
 +
                                <p>Fluorescein Standard Curve</p>
 +
<img src = "https://static.igem.org/mediawiki/2018/b/b9/T--RDFZ-China--Particle_Standard_Curve.png" alt = "Particle Standard Curve" style = "width: 50%"><br>
 +
<font size = "1">Figure 2. Fluorescein Standard Curve.</font>
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</div>
 +
<h2>Raw Plate Reader Measurements</h2>
 +
<div class="inlabdiv">
 +
<p><b>Fluorescence Raw</b></p>
 +
<img src = "https://static.igem.org/mediawiki/2018/7/74/T--RDFZ-China--Fluorescence_Raw_0_hour.png" alt = "Fluorescence at 0h" style = "width: 50%"><br>
 +
<font size = "1">Table 2. Raw Plate Reader Measurements of Fluorescence Raw at 0 hour.</font>
 +
</div>
 +
<div class = "inlabdiv">
 +
<img src = "https://static.igem.org/mediawiki/2018/0/0c/T--RDFZ-China--Fluorescence_Raw_6_hours.png" alt = "Fluorescence at 6h" style = "width: 50%"><br>
 +
<font size = "1">Table 3. Raw Plate Reader Measurements of Fluorescence Raw at 6 hours.</font>
 +
</div>
 +
<div class = "inlabdiv">
 +
<p><b>Abs<sub>600</sub> Raw</b></p>
 +
<img src = "https://static.igem.org/mediawiki/2018/c/ce/T--RDFZ-China--Abs600_Raw_0_hour.png" alt = "Abs600 at 0h" style = "width: 50%"><br>
 +
<font size = "1">Table 4. Raw Plate Reader Measurements of Abs600 Raw at 0 hour.</font>
 +
</div>
 +
<div class = "inlabdiv">
 +
<img src = "https://static.igem.org/mediawiki/2018/8/89/T--RDFZ-China--Abs600_Raw_6_hours.png" alt = "Abs600 at 6h" style = "width: 50%"><br>
 +
<font size = "1">Table 5. Raw Plate Reader Measurements of Abs600 Raw at 6 hours.</font>
 +
</div>
 +
<div class = "inlabdiv">
 +
                                <p><b>CFU counts</b></p>
 +
<table style = "width: 70%; height: 200px;">
 +
<tr>
 +
<th>Device</th>
 +
<th>Dilution Factor</th>
 +
<th>CFU Replicate 1</th>
 +
<th>CFU Replicate 2</th>
 +
<th>CFU Replicate 3</th>
 +
</tr>
 +
<tr>
 +
<td rowspan="3">Positive Control 1</td>
 +
<td>8*10<sup>4</sup></td>
 +
<td>69</td>
 +
<td>22</td>
 +
<td>191</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>5</sup></td>
 +
<td>5</td>
 +
<td>2</td>
 +
<td>5</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>6</sup></td>
 +
<td>1</td>
 +
<td>0</td>
 +
<td>0</td>
 +
</tr>
 +
<tr>
 +
<td rowspan="3">Positive Control 2</td>
 +
<td>8*10<sup>4</sup></td>
 +
<td>1</td>
 +
<td>15</td>
 +
<td>65</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>5</sup></td>
 +
<td>1</td>
 +
<td>1</td>
 +
<td>5</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>6</sup></td>
 +
<td>0</td>
 +
<td>0</td>
 +
<td>1</td>
 +
</tr>
 +
<tr>
 +
<td rowspan="3">Negative Control 1</td>
 +
<td>8*10<sup>4</sup></td>
 +
<td>98</td>
 +
<td>164</td>
 +
<td>85</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>5</sup></td>
 +
<td>85</td>
 +
<td>29</td>
 +
<td>48</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>6</sup></td>
 +
<td>19</td>
 +
<td>63</td>
 +
<td>23</td>
 +
</tr>
 +
<tr>
 +
<td rowspan="3">Negative Control 2</td>
 +
<td>8*10<sup>4</sup></td>
 +
<td>190</td>
 +
<td>226</td>
 +
<td>274</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>5</sup></td>
 +
<td>52</td>
 +
<td>54</td>
 +
<td>49</td>
 +
</tr>
 +
<tr>
 +
<td>8*10<sup>6</sup></td>
 +
<td>78</td>
 +
<td>20</td>
 +
<td>24</td>
 +
</tr>
 +
</table>
 +
<font size = "2">Table 6. Colony Forming Unit Counts.</font>
 +
       </div>
 +
</div>
 +
 
 +
<div>
 +
<h1>Evaluation</h1>
 +
<p>The control LB measures in Table 4 and Table 5 are a little different, since we changed the LB control after dilution: two different bottle of LB with Chl were measured. The CFU counts in same dilution factor show great variation <b>(Table 6)</b>. High variation may result from the difference of experimenters' spreading methods or fluctuations in the starting sample <em>(starting samples were diluted to OD<sub>600</sub>=0.1 approxiamately)</em>.</p>
 +
</div>
 +
 +
<div>
 +
<h1>Our Thoughts</h1>
 +
<p><em>Yishen Shen:</em><br>Although it's not my first time to participate in an experiment, I still learned a lot from the InterLab.  With so many steps in protocols out there, it can be overwhelming to get started right away. I learned that I should copy down all protocols down on notebook beforehand; it's much easier to follow a protocol that I have written and analyzed by myself.  Also, it's handy to obtain all the necessary reagents in advance and make sure they are all in good conditions. I used to run out for reagent in the middle of an experiment and that makes it hectic and messy. Furthermore, I get to know that preparing a timeline is the key. Dividing a day into various blocks keeps me busy and efficient. The three-day experience in InterLab teaches me a lot, though it's mostly repetitive, I got to acquire new knowledge every day and that makes it memorable.</p>
 +
<p><em>Jianxiang Zhang:</em><br>We feel like that the protocol can sometimes be ambiguous. For instance, the protocol says to "check the OD<sub>600</sub> and make sure it is 0.1 (minus the blank measurement)", it is kind of confusing about how to interpret the content inside the parentheses. Overall, the InterLab study is helpful for providing new measuring methods to our later part characterization study.</p>
 +
</div>
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 +
<div>
 +
<h1>Acknowledgements</h1>
 +
<p><em>Thanks to Molecular Biology Laboratory in Tsinghua University, we could follow the protocols without issues regarding apparatus and reagents. Also, we'd like to appreciate our advisor and anyone who helped us in Tsinghua and Peking University for providing suggestions and guidance during InterLab studies.</em></p>
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</div>
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</section>
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