We will do this lab today, but I don't have enough sterile filter paper circles for everyone to do their own petri dish. I have 50 that I purchased, but that would be enough for each group to do the lab together. I think I'm going to do one plate per person and use circles I cut out of coffee filters so everyone can have his/her own plate. I wish they had been sterilized, but it's too late for that. NEXT semester, I need to cut the circles and then autoclave them before the lab. I should have done that last week.
I am going to use Clorox, Quat 50, Iodine, 70% alcohol, 95% alcohol, and antibiotic ointment for them to choose their 4 antiseptics or disinfectants from.
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