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May 2011

Wednesday, 11 May 2011

SU8 Training for Lilia, Vincent, and Douglas. We made one complete flow wafer.

Work done, initially on four blank wafers:

• O2 plasma stripped
• SU8 spin-coated + baked. Most wafers had defects (bubbles, or even comets).
• UV exposure of flow pattern
• The best wafer was post-expose baked. The others were left unpolymerised
• Developed in PGMEA. The three non-baked wafers are now stripped and blank again.
• Valid wafer verified by optical microscopy and contact profilometry. Some dust contamination, will need to be blow-cleaned before PDMS moulding.
• The three other wafers can be cleaned and re-used (SRD, Piranha solution, 02 plasma strip).

For details of the process, see protocol for SU8 processes: [http://cmi.epfl.ch/photo/photo_process/files/Sawatec_processSU8.php| SU8 Process by CMI]

Friday, 13 May 2011

Alina and Douglas designed primers for the sequence verification of the lysis cassette. Four 'forwards' and three 'backwards' primers are needed to sequence the DNA in four segments:

>_1289_F     |X|13.05.2011
ttgtcggtgaacgctctcta

>_1734_R     |X|13.05.2011
cctggctctagtaatttcattcag

>_947_F     |X|13.05.2011
gcggaatcctgagaaatgct

>_440_F     |X|13.05.2011
tcctgttgataaaactatggatgaa

>_1333_R     |X|13.05.2011
cgaaggtgagccagtgtgac

>_30_F     |X|13.05.2011
agggtctatggcagcaccta

>_816_R     |X|13.05.2011
caaatgaccgatgccaatag

The primers were designed using the online tool [http://www.bioinformatics.nl/cgi-bin/primer3plus/primer3plus.cgi| Primer3Plus]

Monday, 16 May 2011

Alina and Douglas prepared solutions of LacI and primers for sequencing, ready to send out to microsynth.

Friday, 20 May 2011

Competant cells (DH5α T1 resistant) were prepared by Henrike, Lilia and Clara using Henrike's protocol, they are stored in a box at -80°C, location indicated on the door of the fridge.

Thursday, 26 May 2011

Competance of the prepared DH5α T1res was measured, 10^5 of CFU/µg (Henrike, Clara, Lilia). λ and T4 lysis device plasmids were transformed, but only T4 lysis device transformation gave 3 colonies, nothing for λ samples.

Friday, 27 May 2011

Using Invitrogen PureLink Quick miniprep kit, plasmids containing TetR-GFP, LacI and pSB1A2 plasmids with T4LysisDevice were purified. For TetR-GFP 162ng/µl concentration was obtained and for other samples ~172ng/µl. (Lilia)

Tuesday, 31 May 2011

Mixed primers to sequence verify the lysis device. Mixed the seven primers designed on 13 May to plasmids containing the T4 Lysis Device, biobrick K112808 (extracted 27 May). For each primer, prepared a 10 ul solution containing 20 pmol primer and 865.5 g plasmid.

Sent to microsynth for sequencing the following day. (Douglas)