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Team:LCG-UNAM-Mexico/Wet Lab/Experiments
From 2009.igem.org
Contents |
C1a growth plot
C1a is a k12-derivative strain. In order to know the behavior of this strain we did a growth curve. Every four hours two samples were taken from a C1a culture. We measured the OD (550nm) of one of those samples, and the other was used to do dilutions and to plate them. The results are shown in the next table.
tiempo (hrs) DO 550nm UFC/ml 0 0.0355 1207000 2 0.2533 25450000 4 0.944 160000000 6 1.2194 165000000
A non-linear regresion method was used to generate a logistic formula with the best adjustment.
The unit time is hours, the y correspond to UFC and the x correspondst to time
The unit time is hours, the y correspond to OD and the x correspondst to time
Both formulas were used to infer a correlation formula between OD and UFC, this formula was used to translate the OD measures to UFC.
T3 and T7 infection plot
Without system
With system
Burst size determination
Without system
With system
Test parts and devices
Multipromotor
We will test the functionality of both T3 and T7 promoters trhough the induction with IPTG of the strain BL21(DE3)pLysS in the case of T7. We are going to extract by PCR the RNA polymerase of the phage T3 and clone it under the control of a promoter inducible with IPTG.
In both cases we expect to see the presence of fluorescence under uv light.
Quorum sensing system
After assembling the quorum sensing device, we will turn on the system by any of the RNA polymerases. We expect to see green florescence in the point of induction and red in the neighborhood. At this point the toxines won't be in the construction to avoid the noise caused by the death.
asRNA
We will induce the asRNA construction with IPTG, afterwards we expect the infection of T7 and T3 to be with less efficience of plaquing.
Toxins
The colicines will be under the transcriptional regulation of the promoter induced by IPTG. We will messure the optical density of the culture just as performed avobe. We will provide the results to the model. We expect the growth curve of this strain to decay before than that of the infection with phages.
