Class 8 Biology Microorganisms: Friend and Foe Microbes role in Antibiotics preparation

Microbes’ role in Antibiotics preparation


Microbes are also used to prepare antibiotics, which are used to treat several bacterial infections. Antibiotics are chemical substances that kill disease-causing microbes. It is quite interesting to find that there are some microbes which cause diseases; on the other hand, some other microbes help in preparation of antibiotics, and thus, cure diseases.



Alexander Fleming, a Scottish scientist discovered the first antibiotic & named it ‘Penicillin’.


Penicillin discovery was ‘a chance’ discovery.  Fleming was experimenting with Staphylococcus bacteria. A petridish (cell culture dish) had been left open by mistake, was found to be contaminated by blue-green mold. This visible mold growth inhibited bacterial growth around itself.


Fleming concluded that mould released a substance that inhibited bacterial growth. This substance was the antibiotic which was named ‘Penicillin’ after the mold Penicillium notatum.

  • Penicillin was named after Penicillium notatum

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