lab 208

Main purpose

Who was in the lab

Kristian, Henrike

Procedure

USER ligation and transformation

Redid for HAO and cyc in arabinose inducible pZA21::araBAD and for Nir fragments

PCR for Biobrick parts

Set up a new PCR reaction for Biobrick parts using HF buffer and 5% DMSO but no MgCl2. PCR was run on a touchdown program

primers: 53a, 53b

template: Sec2 miniprep

program:

Gel purification

Gel purified the linearized plasmid pZA21::ara with USER endings

colony pPCR to verify AMO insert

Picked 10 colonies from yesterday's cloning for colony PCR. Diluted cells in 50 uL of MilliQ and took 1 uL as template

primers: 53a, 53b

program:

Results

nanodrop measurement of ara spl plasmids

Conclusion

lab 115

Main purpose

Run Experiment 2 in two different samples anaerobically in order to characterize the behavior of E.coli.

Who was in the lab

Ariadni, Helen

Procedure

Adjusting the temperature at 36 degrees and calibrating the probes as described in Calibration protocol.

Following the protocol Experiment 2

Changing the steps :

6. 4 ml of the overnight culture growing in DM minimal medium

12. The OD was measured OD=0.261 in sample A and OD=0.263 in sample B.

19.

• For sample A after taking the first sample, we continue with two more samples after 5 and 10 minutes. Then we add 2 ml of nitrite solution and continue by taking a sample after spiking. Then we took three more samples and after 15 minutes we spike with 2 ml of nitrite, and finally we took a last sample. The final OD measurement was OD=0.244 and the temperature was 36.8 degrees.

• For sample B after taking the first sample, we continue with two more samples after 5 and 10 minutes. Then we add 1 ml of nitrite solution and continue by taking a sample after spiking. Then we took two more samples and after 10 minutes we spike with 4 ml of nitrite, and then there was a response after 12 minutes were finally we took one sample and after 5 minutes the last. The final OD measurement was OD=0.248 and the temperature was 36.4 degrees.

Results

Colorimetric results

For Sample A Ammonium

Measuring range 2-75 mg/L NH₄-N

start point- signal <2 mg/L

middle point- signal 2 mg/L

end point- signal <2 mg/L

Nitrate

Measuring range 1-25 mg/L NO₃-N

start point- signal <1 mg/L

middle point- signal <1 mg/L but visible pinker

end point- signal <1 mg/L but much visible pinker

Nitrite

Measuring range 0.02-1 mg/L NO₂-N

start point- signal <0.02 mg/L

middle point- signal 0.29 mg/L

end point- signal 0.70 mg/L after X2 dilution

Point before spiking with NO₂ at the end measurement 1.03 mg/L (x2 dilution)- 0.5 mg/L (x4 dilution)

Conclusion

The E.coli didn't grow as usual and the problem might be the minimal medium.

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