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Revision as of 20:51, 18 September 2015
The team has a meeting once a week. We report progresses of our project and discusses about the assignment what we will do next week. Our teammates are passionate for discussions and everyone shares documents they have read and what they have learned. Teammates ask questions about the papers shared. It usually take a long time to discuss questions related to our iGEM project. This activity drives us to read more literature and learn more knowledge.
The advisers not only attend our meetings to listen our reports about experiment progresses, but also provide suggestions on the project. They may share research trends in their lab as well. What’s more, sometimes they give a talk to introduce some experimentation which really light up our experiments.
We know that T7 promoter is a kind of inducible promoter. Hill equation can be used to simulate the effect of T7 promoter. In T7 strength model, the independent variable is the concentration of IPTG, and the dependent variable is the production of dsRNA.
By observing the pattern of the data, we figure out that the Logistic equation, which is often used to simulate the growth of population, can model the trend best. Thus, we adapt the formula
in the following fitting, where a is the concentration of dsRNA in the steady state.
When the concentration of IPTG=0.3mmol/L, the result of curve fitting is:
General model:
Coefficients (with 95% confidence bounds):
a = 0.3241 (0.299, 0.3492)
b = 35.95 (-79.99, 151.9)
c = 1.829 (0.3231, 3.334)
Goodness of fit:
SSE: 0.00333
R-square: 0.9676
Adjusted R-square: 0.9567
RMSE: 0.02356
When the concentration of IPTG=0.4mmol/L, the result of curve fitting is:
General model:
Coefficients (with 95% confidence bounds):
a = 0.3474 (0.3261, 0.3686)
b = 46.66 (-63.55, 156.9)
c = 1.828 (0.7647, 2.892)
Goodness of fit:
SSE: 0.00232
R-square: 0.9808
Adjusted R-square: 0.9744
RMSE: 0.01966
When the concentration of IPTG=0.5mmol/L, the result of curve fitting is:
General model:
Coefficients (with 95% confidence bounds):
a = 0.3465 (0.3206, 0.3723)
b = 49.63 (-79.79, 179)
c = 1.76 (0.6333, 2.886)
Goodness of fit:
SSE: 0.003338
R-square: 0.9732
Adjusted R-square: 0.9642
RMSE: 0.02359
By the work of first part, it is found that the concentration of dsRNA will become steady after around 4 hours, so we regard the concentration of dsRNA after 4 hours’ culture as that of steady state. Then the Hill equation is applied to model the relationship between the concentration of IPTG and the production of dsRNA, the result of curve fitting is: (where is the maximal data we can get from the data)
General model: 
Coefficients (with 95% confidence bounds):
Xm = 0.1265 (0.08411, 0.1689)
n = 2.239 (0.8187, 3.658)
Goodness of fit:
SSE: 0.003107
R-square: 0.9062
Adjusted R-square: 0.8828
RMSE: 0.02787
We sorted out data and parameters and then beautified the graph.
Figure 5 shows the relationship between the concentration of IPTG and the production of dsRNA. According to this mathematical model, we can work out the accurate production of dsRNA which is fed to the larvae with the concentration of IPTG which is put into the bacterial system to induce T7 promoter.