Team:Heidelberg/Notebook/Visualization/Methods

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Contents

Microscope

Small chamber

chemotactical activity

Large chamber

computer-assisted analysis

Swarm Assays

PROTOCOL FOR SWARM-PLATE CHEMOTAXIS AGAINST A POSSIBLE ATTRACTANT:
This protocol was created using petri-dishes. But every other chamber could be used as well.


  • Step 1: Make sure you have everything ready to get started. You need:
    • Petri-dishes. !!! sign your petri-dishes before You pour in the media. Also mark the spots where you want to set the attractant or attractant line and the bacteria. !!!
    • 50 ml falcons
    • 25 ml media containig 0.2%-0.3% Agar for every petri-dish.
    • samples of the appropriate attractants. The concentration depends on several substance depending attributes.
    • Other substances like antibiotics (Amp, Kan, Cm) or inducer (IPTG, Arabinose)
  • Step 2: Your agar-media solution should be clear and the agar completely solved. If you want to use attractant plugs1 or other non fluid attractants, go first through step 5 then back through 2,3,4 skip 5, further with 6 and so on...
  • Step 3: Take Take a 50 ml falcon pour 25 ml of your agar containing media in it and add antibiotics or inducing substances. If no extra substances are needed just skip this step.
  • Step 4: Let your media polimerize. At least let it rest for 15/20 min.
  • Step 5: Then add the attractant. e.g.: a casamino acid solution
  • Step 6:
    • Put the whole plate into a 4°C fridge for 12-16 hours to allow the attractant to build up a gradient.
    • Make an overnight culture of the strains you want to test, use TB media and add inducing substances if something has to be induced.

Next day:

  • Step 7: Take your overnight culture. It should be at an OD of 0.4-0.6. Then take 1 ml of the bacteria suspension and centrifuge it for 10 minutes at 4,000 rpm. Resolve the pellet at 100 µl of the media you are using in the petri-dish.
  • Step 8: Place 3-6 µl of your purrified bacteria at the premarked spots on the petri-dish sample.
  • Step 9: Put the whole plate into the incubator at ~30°C and take a look at your plates after 24, 48 and 72 hours. Put the plates into a plastic bag like the small ones for the bench trash to protect the plates from running dry to fast. Only move the plates if necessary.

1:
attractant plugs can be created by adding agar to the attractant solution.

EXAMPLES:

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