Spring 11:Directed Evolution/Week of 4-18-2011 Status

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Weekly Progress

Weekend/Monday

Initial chambers for testing cells & fluorescent beads
  • Finalized parts list.

Imgs4.png

  • Continued coding image analysis / segmentation code.
  • Fabricated Microfluidics using resources from Kamm lab and Voldemann lab.
    • PDMS poured & cured Monday afternoon
  • Moved microscope setup to larger breadboard.

Monday Evening

  • 2 Cultures of I13521 started from freezer stocks tubes 2&3. Aliquoted into 5mL of LB+Amp and left to grow overnight. ~12 hours of growth time should be sufficient for experimentation tomorrow.
  • Idea: potentially growing up KAF95 and miniprepping it may prove useful if we can BioBrick out the fliC273 gene.

Tuesday

  • Aligned microscope setup on the larger breadboard
  • Tested different perfusion chambers:
  • PDMS with microwell is too thick to be imaged with inverted microscope
  • Stick on perfusion chambers are reusable
  • Visualized RFP bacterial cells under BF and Fluoresence, pictures were taken for further analysis

Wednesday

  • Begin building stepper motor driver circuitry with Polulu and Arduino
  • Experimenting with serial communication in Python, wrapper for stage control
  • Arduino C language for firmware in microcontroller, buffers and interpret serial input in bytes, and output electrical pulses

Thursday

  • Stage control code tested: stepper motor can run at different speeds with specified number of steps through python
  • Input as (X direction, X step, Y direction, Y step)
  • X-Y axes motors move simultaneously given input to desired location

Friday

  • Mutation plasmid from Liu's group acquired. Transformed and grew in spectinomycin, but antibiotic was too weak, redo over weekend.
  • Finalizing and committed stage code.
  • Meeting with another MIT group to discuss building the ablation laser.

Notes

Biology

  • David Liu has agreed to give us MP-QUR, pickup will be TBD, but we can hopefully just go over to Harvard and get the plasmid.
  • The Elowitz Repressilator can apparently be found on Add-Gene, will need to either find or figure out a good testing rig to put it in.
  • Cory has I13521 and I13522, although both are in pSB1A3, which might prove problematic if the KAF95 fliC is also on a pBR322 derived plasmid. Current backup is J04450 which can be found in pSB1C3 and would allow for a co-transformant.