Difference between revisions of "Part:BBa K257021:Experience"

(→‎Applications of BBa_K257021)
(→‎Measurement of BBa_K257021 delay)
 
(5 intermediate revisions by 2 users not shown)
Line 5: Line 5:
 
===Applications of BBa_K257021===
 
===Applications of BBa_K257021===
  
 +
====Measurement of BBa_K257021 delay====
 +
BBa_K257021 was grown overnight in LB medium with:<br>
 +
- Glucose 1 % <br>
 +
- nothing <br>
 +
- IPTG (0.2mg/ml) <br>
  
 +
Each of the 3 overnight cultures was then diluted to the 1/100 in each of the 3 conditions. Fluorescence and OD were assessed in a Tecan plate reader.
 +
[[Image:PTPR-Fluo OD.JPG|450px]][[Image:PTPR-Normalized Fluo OD.JPG|450px]]
 +
 +
In the second graph, fluorescence was normalized by the mean Fluo/OD of all the conditions where mRFP1 is continuously expressed.
 +
 +
We observe a delay of ~10000sec between the beginning of the experiment and the changes in RFP expression.
 +
 +
Note that the delay is shorter for the LB + glucose -> LB + IPTG shift than for the LB + glucose -> LB shift.
 +
 +
====Microscopy====
 
<br>
 
<br>
 
[[Image:PtetRFP_trans.jpg|360px]]
 
[[Image:PtetRFP_trans.jpg|360px]]
 
<br>
 
<br>
 
x1000 observation on white light of E. coli with the pLac-TetR::pTet-mRFP construction
 
x1000 observation on white light of E. coli with the pLac-TetR::pTet-mRFP construction
 +
  
 
[[Image:PtetRFP_fluo.jpg|360px]]
 
[[Image:PtetRFP_fluo.jpg|360px]]
 
<br>
 
<br>
 
x1000 observation after fluorescence excitation of E. coli with the pLac-TetR::pTet-mRFP construction
 
x1000 observation after fluorescence excitation of E. coli with the pLac-TetR::pTet-mRFP construction
 +
  
 
[[Image:Ptet_RFP_Glucose_trans1.jpg|360px]]
 
[[Image:Ptet_RFP_Glucose_trans1.jpg|360px]]
Line 27: Line 44:
 
'''Conclusion :'''
 
'''Conclusion :'''
 
<br>
 
<br>
−
In presence of glucose pLac is repressed and then in absence of TetR the pTet promoter is turned on and activates the transcription of mRFP. Accordingly to the construction more bacteria with our construction are fluorescent in presence of glucose than in the control.
+
In presence of glucose pLac is repressed and then in absence of TetR the pTet promoter is turned on and activates the transcription of mRFP. Accordingly to the construction more bacteria are fluorescent in presence of glucose than in the control.
  
 
===User Reviews===
 
===User Reviews===

Latest revision as of 13:11, 27 October 2009

This experience page is provided so that any user may enter their experience using this part.
Please enter how you used this part and how it worked out.

Applications of BBa_K257021

Measurement of BBa_K257021 delay

BBa_K257021 was grown overnight in LB medium with:
- Glucose 1 %
- nothing
- IPTG (0.2mg/ml)

Each of the 3 overnight cultures was then diluted to the 1/100 in each of the 3 conditions. Fluorescence and OD were assessed in a Tecan plate reader. PTPR-Fluo OD.JPGPTPR-Normalized Fluo OD.JPG

In the second graph, fluorescence was normalized by the mean Fluo/OD of all the conditions where mRFP1 is continuously expressed.

We observe a delay of ~10000sec between the beginning of the experiment and the changes in RFP expression.

Note that the delay is shorter for the LB + glucose -> LB + IPTG shift than for the LB + glucose -> LB shift.

Microscopy


PtetRFP trans.jpg
x1000 observation on white light of E. coli with the pLac-TetR::pTet-mRFP construction


PtetRFP fluo.jpg
x1000 observation after fluorescence excitation of E. coli with the pLac-TetR::pTet-mRFP construction


Ptet RFP Glucose trans1.jpg
x1000 observation on white light of E. coli with the pLac-TetR::pTet-mRFP construction in presence of 1% glucose


Ptet RFP Glucose fluo1.jpg
x1000 observation after fluorescence excitation of E. coli with the pLac-TetR::pTet-mRFP construction in presence of 1% glucose


Conclusion :
In presence of glucose pLac is repressed and then in absence of TetR the pTet promoter is turned on and activates the transcription of mRFP. Accordingly to the construction more bacteria are fluorescent in presence of glucose than in the control.

User Reviews

UNIQc8b4dc76c3f3bf30-partinfo-00000000-QINU UNIQc8b4dc76c3f3bf30-partinfo-00000001-QINU