It looks like you're describing an experimental setup to test the effectiveness of a new antibiotic against Streptococcus pyogenes. Based on your description, the setup includes three dishes containing the bacteria.
Here’s a brief outline of what each dish represents in the experiment:
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Dish 1: This dish contains Streptococcus pyogenes without any antibiotic treatment. This will help establish a baseline of bacterial growth.
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Dish 2: This dish contains Streptococcus pyogenes and a disk soaked in the new antibiotic. This is where the researcher will observe the effects of the antibiotic on the bacterial growth.
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Dish 3: This dish serves as a control. It might have Streptococcus pyogenes without the antibiotic disk or a disk soaked in a solvent (e.g., water or ethanol) that does not have antibiotic properties. This allows the researcher to compare the results from Dish 2 against a group with no antibiotic influence.
To analyze the effectiveness of the new antibiotic, the researcher could measure the zone of inhibition around the disk in Dish 2, which indicates how well the antibiotic prevents the bacteria from growing. A larger zone would suggest greater effectiveness of the antibiotic.
If you have a specific question regarding this setup, such as how to interpret results or any other aspect of the experiment, feel free to ask!