Evidence concerning the effect of substances inhibiting the growth of microorganisms, e.g. antibiotics, chemotherapeutics, and disinfectants, can be provided by treating cultures with the substances to be studied and by observing the growth of the microorganisms. Evidence concerning the effect of disinfectants can be provided by letting sterile agar in Petri dishes become infected with airborne microorganisms, spraying the plates with the disinfectant to be studied, and by incubating the plates. This method can also be applied in order to demonstrate and compare the effect of different concentrations of the same disinfectant in a manner that is usually sufficient for school purposes. Evidence concerning the effect of antibiotics and chemotherapeutics can be provided by way of the so-called punched-hole test.
- Experiment is part of a series of complementary microbiology experiments
- Equipment of this experiment can also be used to perform other experiments from the series
- Evidence of the effect of antibiotics and chemotherapeutics
- Evidence of the effect of disinfectants
What you can learn about
- Nutrient agar