Difference between revisions of "Part:BBa K606035:Experience"

 
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This experience page is provided so that any user may enter their experience using this part.<BR>Please enter
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===Characterization===
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how you used this part and how it worked out.
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This construct was transformed into BL21 strains expressing the T7 polymerase under IPTG induction.
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'''Fluorescence kinetics'''
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<p>The measurements have been carried out on a spectrophotometer, at 37°C under transient shaking. The experiment lasted 4h, we tested several colonies and several IPTG concentrations. The OD 600nm and the fluorescence of the GFP (exc: 470nm / meas:515 nm) was measured every 5 min, and the ratio of the two was calculated.</p>
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<p>All values were normalized by substracting the fluorescence/OD value of the well with 0 mM IPTG at time 0. The values given are in arbitrary units.</p>
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[[Image:GrowthpT7GFPt7ter.png|center|thumb|500px|Fig1: Growth curves for BL21 strain carrying the part]]
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<p>After 2 hrs of induction, we see a clear increase of the fluorescence proportional to the IPTG concentration (that is to say with the quantity of T7 polymerase induced in the cell). After 4 hrs, the expression of GFP under the pT7 is still not saturated</p>
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[[Image:pT7GFPSaturated.png|center|thumb|600px|Fig2: Comparison of the Fluo/OD ratio for transcription]]
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===Applications of BBa_K606035===
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<p>Here, we plot the ratio of induction of the T7 polymerase dependant construct for the different concentrations of IPTG at a given time (4 hrs), taking the well with 0 IPTG at time 0 as the reference.</p>
  
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===User Reviews===
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Enter the review inofrmation here.
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Latest revision as of 12:03, 24 October 2011

Characterization

This construct was transformed into BL21 strains expressing the T7 polymerase under IPTG induction.

Fluorescence kinetics

The measurements have been carried out on a spectrophotometer, at 37°C under transient shaking. The experiment lasted 4h, we tested several colonies and several IPTG concentrations. The OD 600nm and the fluorescence of the GFP (exc: 470nm / meas:515 nm) was measured every 5 min, and the ratio of the two was calculated.

All values were normalized by substracting the fluorescence/OD value of the well with 0 mM IPTG at time 0. The values given are in arbitrary units.

Fig1: Growth curves for BL21 strain carrying the part

After 2 hrs of induction, we see a clear increase of the fluorescence proportional to the IPTG concentration (that is to say with the quantity of T7 polymerase induced in the cell). After 4 hrs, the expression of GFP under the pT7 is still not saturated

Fig2: Comparison of the Fluo/OD ratio for transcription

Here, we plot the ratio of induction of the T7 polymerase dependant construct for the different concentrations of IPTG at a given time (4 hrs), taking the well with 0 IPTG at time 0 as the reference.