Imperial/Cell by Date/Testing

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===Investigation System properties under Dynamic Temperature Conditions===
===Investigation System properties under Dynamic Temperature Conditions===
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[[Image:IC 2007 CBD steps.PNG| The graph shows how a step increase and decrease in temperature affects the fluorescence produced by the pTet-GFPmut3b construct|100px]]]]<br clear ="all">
Response time extraction still to do
Response time extraction still to do

Revision as of 19:12, 26 October 2007



Cell by Date: Testing

Testing and Discussion

Investigation properties of system under isothermal scenarios

To estimate the properties of our system we looked at the evolution of the Fluorescence with time for experiments where temperature is carefully kept constant. (Figure 1).
General Behaviour:

  • In all experiment we can observe a linear growth of fluorescence corresponding to a steady rate of protein production.
  • This matches the claims of the manufacturer of the cell-free extract that the extract is optimised so that protein degradation is negligible.

Isothermal Data

Operating Range:

  • Our system seems to 'turn off' at around 4 degrees C.
  • At 8 degrees with have minimal expression which then increases to a substantial expression at 37 degrees.

Synthesis rate vs Temperature

  • Over the range of temperature considered here the rate increases with temperature.
  • To investigate the relation between synthesis rate and temperature we extracted the rate of synthesis of GFP for each experiment and plotted it against 1/T (Figure 2).
  • A strong linear correlation in the log plot supports an arrhenius type dependence on temperature with an activation energy of 1.5kJ/mol.

Arrhenius Plot

Other practical considerations:

  • Unfortunetly we have not been able to use a visible reporter and so have no idea whether the construct can in fact produce a visible signal.
  • In terms of lifespan we have had major problems with evaporation meaning that the lifespan of our system is limited to a few days.

Investigation System properties under Dynamic Temperature Conditions

The graph shows how a step increase and decrease in temperature affects the fluorescence produced by the pTet-GFPmut3b construct]]

Response time extraction still to do

Validation and Conclusion

<< Implementation | Testing/Validation | Conclusions >>