Endy:STN Chemostat Protocol: Difference between revisions
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==Day 1== | ==Day 1== | ||
*Take OD600 of o/n culture. Dilute back in the morning into 25 mL/chamber supM9 (~1:100) | *Take OD600 of o/n culture. Dilute back in the morning into 25 mL/chamber supM9 (~1:100) | ||
*When culture reaches ~OD 2.0 to add 20 mL to each chamber. | *When culture reaches ~OD 2.0 to add 20 mL to each chamber (usually late afternoon). | ||
*Run at 37 C. The bubbler should be set to the white dot for 6 chambers (med/high) and the effluent needle should be set to around the 24 mL mark to maintain a volume of 20 mL. | *Run at 37 C. The bubbler should be set to the white dot for 6 chambers (med/high) and the effluent needle should be set to around the 24 mL mark to maintain a volume of 20 mL. | ||
*Add the media input (teal, 23-G1 needle) and turn on pump (currently 10 rpm for 20 mL/chamber). After about 1 hour, check that the culture volume is 20 mL and adjust effluent as necessary. | *Add the media input (teal, 23-G1 needle) and turn on pump (currently 10 rpm for 20 mL/chamber). After about 1 hour, check that the culture volume is 20 mL and adjust effluent as necessary. | ||
*The cultures should wash out to a stable OD600 by the morning (day 2). OD600 should be monitored throughout the day (~every 3 hrs) and samples drawn for steady-state measurement either in the latter part of day 2 or on day 3. | |||
==Notes== | ==Notes== | ||
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*Measure the flow rate by the effluent. 10 rpm gives about 0.25 mL/min, which is about right, but flow rate should be checked during each run. | *Measure the flow rate by the effluent. 10 rpm gives about 0.25 mL/min, which is about right, but flow rate should be checked during each run. | ||
*Mark 18 mL, 20 mL, and 22 mL on chemostat chambers to assist in monitoring volume. | *Mark 18 mL, 20 mL, and 22 mL on chemostat chambers to assist in monitoring volume. | ||
Revision as of 09:10, 26 July 2005
cmc_jcb
Day 0
Set up o/n culture in supM9 media in a small flask at 37 C.
Day 1
- Take OD600 of o/n culture. Dilute back in the morning into 25 mL/chamber supM9 (~1:100)
- When culture reaches ~OD 2.0 to add 20 mL to each chamber (usually late afternoon).
- Run at 37 C. The bubbler should be set to the white dot for 6 chambers (med/high) and the effluent needle should be set to around the 24 mL mark to maintain a volume of 20 mL.
- Add the media input (teal, 23-G1 needle) and turn on pump (currently 10 rpm for 20 mL/chamber). After about 1 hour, check that the culture volume is 20 mL and adjust effluent as necessary.
- The cultures should wash out to a stable OD600 by the morning (day 2). OD600 should be monitored throughout the day (~every 3 hrs) and samples drawn for steady-state measurement either in the latter part of day 2 or on day 3.
Notes
- Run with bleach solution, then H20 after use. Autoclave all components on fast (22 psi, 250 F, 30 min.).
- This water bath should be filled with dI. Top up frequently with dI kept at 37 C.
- Use 1_5_05 supplemented M9 minimal media with AMP (50 ug/mL) or Kan (20 ug/mL) as needed.
- Measure the flow rate by the effluent. 10 rpm gives about 0.25 mL/min, which is about right, but flow rate should be checked during each run.
- Mark 18 mL, 20 mL, and 22 mL on chemostat chambers to assist in monitoring volume.