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I'm going to make agar plates and determine the viable titer after testing.
I plan on mixing 8.5 ml agar with 0.5 ml soil bacteria dilution in water and 1 ml of a 10^4 dilution of a chemical in distilled water.
Or, if that's too much water, then 9.4 ml nutrient agar with 0.5 ml bacteria dilution and 0.1 ml of a 10^3 dilution of chemical. The entire 10 ml of liquid would be a 10^5 dilution of the chemical.
My directions for making plates says to pour a 3 mm layer on the bottom of the petri dish. Will the bacteria still grow if it is only 1.5-2 mm thick? I don't have enough agar and I can't afford to mess up.
Can I open petri dishes if they have soil microorganisms or would I have to have a lab? I want to gram stain the bacteria.
Thanks for any responses.
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- Joined: Sun Sep 23, 2012 1:42 am
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- Project Question: Toxicity of Pesticides
- Project Due Date: 2/2013
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Please read the Microorganisms Safety Guide: http://www.sciencebuddies.org/science-fair-projects/project_ideas/Micro_Safety.shtml
The information you need is in the section about Unknown Microorganisms. I do suggest you use a laboratory if you are going to do any staining from your bacterial cultures.
The depth of the agar is important - as long as you cover the bottom and can keep them from drying out during incubation they should grow bacteria without a problem.
good luck! Let me know if you have more questions.
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