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| − | <div class="container">
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| − | <div class="main_content">
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| − | <div class="title">Interlab Study</div>
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| − | <article>
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| − | Reproducibility of results in different laboratories is crucial to facilitate science. We participated in the interlab study to support the iGEM community and provide them with data for the interlab comparison of measurement results.
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| − | </article>
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| − | <h2>Material</h2>
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| − | <article>
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| − | We applied the protocol for plate reader[link] that was provided by the iGEM HQ.
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| − | This year a positive and negative control additionally to six other plasmids containing GFP (green fluorescent protein) genes with different Anderson promoters were transformed into Escherichia coli K-12 DH5α. The following devices were tested:
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| − | <br>
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| − | Negative control BBa_R0040: TetR repressible promoter
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| − | <br>
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| − | Positive control BBa_I20270: GFP with weak RBS (ribosomal binding site)
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| − | <br>
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| − | Test Device 1 BBa_J364000
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| − | <br>
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| − | Test Device 2 BBa_J364001
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| − | <br>
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| − | Test Device 3 BBa_J364002
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| − | <br>
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| − | Test Device 4 BBa_J364007
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| − | <br>
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| − | Test Device 5 BBa_J364008
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| − | <br>
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| − | Test Device 6 BBa_J364009
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| − | <br>
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| − | All devices were transformed into <i>Escherichia coli</i> K-12 DH5α using 5 µL from the distribution plates. Colonies were picked and colony PCR was conducted to ensure whether transformation with the correct insert was successful. Afterwards the colonies were incubated overnight in 5 mL LB medium and 25 µg mL-1 chloramphenicol.
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| − | For measurements two cultures of each plate were picked and grown overnight in 5 mL LB media with 25 µg mL<sup>-1</sup> chloramphenicol at 37 °C.
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| − | <br>
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| − | The bacteria cultures were diluted to OD<sub>600</sub> of 0.02 in a total volume of 12 mL LB with 25 µg mL<sup>-1</sup> chloramphenicol in 50 mL falcon tubes covered in foil and incubated in darkness for 6 hours at 37 °C and 220 rpm. 500 µL samples were taken after 0 and 6 hours of incubation and stored on ice until the measurement. Absorbance was measured by OD<sub>600</sub>, fluorescence by excitation at 485 nm and emission at 530 nm.
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| − | <br>
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| − | To determine the amount of colony forming units (CFU) per mL the overnight culture of the negative and positive control were diluted to OD<sub>600</sub> 0.1 in LB medium with 25 µg mL<sup>-1</sup> chloramphenicol in a total volume of 1 mL. The culture was further diluted in LB medium with 25 µg mL-1 chloramphenicol in five dilutions steps according to figure 1. Dilution steps three, four and five were put on LB plates containing 25 µg mL<sup>-1</sup> chloramphenicol and incubated overnight.
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| − | </br>
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| − | </article>
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| − |
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/d/d0/T--Bielefeld-CeBiTec--InterlabStudyDilutionPlan_MO.png">
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| − | <figcaption>
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| − | <b>Figure 1:Dilution steps for measuring the CFU per mL of the negative and positive control. Figure from iGEM Headquarter </b>
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| − | </figcaption>
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| − | </figure>
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| − |
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| − | <h2>Material</h2>
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| − | <article>
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| − | Incubator: We used the GFL Type 30/32 incubator at 37 °C and 220 rpm. We covered the glass front with paper to make sure the samples grew in darkness.
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| − | <br>
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| − | Cuvette measurement: For the first OD<sub>600</sub> measurement of the overnight cultures we used an Eppendorf 6131 BioPhotometer.
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| − | <br>
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| − | Plate reader: Our plate reader model was the Tecan Infinite M200 (Roche). The excitation wavelength was set to 485 nm and emission wavelength was detected at 530 nm [1].
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| − | <br>
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| − | 96 well plate: We used the 96 well microplates in black (polystyrene) from Greiner Bio-One for our measurements with the plate reader.
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| − | <br>
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| − | E. coli strains
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| − | <br>
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| − | <i>E. coli</i> K-12 DH5α
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| − | <br>
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| − | </article>
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| − | <h2>Results</h2>
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| − | <article>
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| − | In order to quantify the results of the Interlab Study two standard measurements have been carried out. The first standard curve (Figure 1) shows measurements with silica beads. Figure 2 shows the standard curve with Fluorescein.
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| − | </article>
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| − |
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/2/2c/T--Bielefeld-CeBiTec--InterlabStudyFluoresceinStandard_MO.png">
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| − | <figcaption>
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| − | <b>Figure 2:Fluorescein Standard curve. </b>
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| − | </figcaption>
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| − | </figure>
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| − |
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/d/de/T--Bielefeld-CeBiTec--InterlabStudyParticleStandard_MO.png">
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| − | <figcaption>
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| − | <b>Figure 3:Particle Standard curve. </b>
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| − | </figcaption>
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| − | </figure>
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| − |
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| − | <article>
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| − | Cultures were treated as described in the [link]protocol. The overnight cultures were diluted to OD<sub>600</sub> 0.02 and cultivated at 37 °C and 220 rpm for six hours. Samples were taken after 0h and 6h. The OD<sub>600</sub> and fluorescence of all samples were measured. The OD<sub>600</sub> after 0h and 6h can be seen in figure 4. The fluorescence of the samples after 0h and 6h can be seen in figure 5.
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| − | </article>
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/c/ca/T--Bielefeld-CeBiTec--InterlabStudyOD600_MO.png">
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| − | <figcaption>
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| − | <b>Figure 4: OD<sub>600</sub> after 0h and 6h of the negative control, positive control and the six test devices. </b>
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| − | </figcaption>
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| − | </figure>
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| − |
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| − |
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/8/8a/T--Bielefeld-CeBiTec--InterlabStudyFluorescence_MO.png">
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| − | <figcaption>
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| − | <b>Figure 5: Fluorescence after 0h and 6h of the negative control, positive control and the six test devices. </b>
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| − | </figcaption>
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| − | </figure>
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| − | <article>
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| − | Furthermore the colony forming units per 0.1 OD<sub>600</sub> of the positive and the negative control were determined. Overnight cultures were diluted to an OD<sub>600</sub> of 0.1. The samples were diluted as seen in figure 1. Dilutions 3,4 and 5 were put on LB Agar + Chloramphenicol plates. The CFU of the positive and the negative control is illustrated in figure 6.
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| − | </article>
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| − | <figure role="group">
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| − | <img class="figure eighty" src="https://static.igem.org/mediawiki/2018/4/46/T--Bielefeld-CeBiTec--CFU_MO.png">
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| − | <figcaption>
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| − | <b>Figure 6: Colony Forming Units (CFU) of the Negative and the Positive Control. Dilution 3, 4 and 5 of both cultures were considered. </b>
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| − | </figcaption>
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| − | </figure>
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