NEET BIOLOGY

Detailed explanation-1: -In 1928, while investigating variant strains of Staphylococcus aureus, Alexander Fleming found that a fungus growing near the edge of a culture of S. aureus produced a substance which had diffused into the medium, lysed the nearest organisms and thus produced a clear area immediately surrounding the fungus.

Detailed explanation-2: -How did Alexander Fleming discover penicillin? In 1928 Alexander Fleming noticed that a culture plate of Staphylococcus aureus bacteria had become contaminated by a fungus. The mold, later identified as Penicillium notatum (now classified as P. chrysogenum), had inhibited the growth of the bacteria.

Detailed explanation-3: -Discovering penicillin In 1928, Fleming discovered penicillin, the first form of antibiotics. He grew cultures of bacteria on petri dishes in the hospital where he worked. A fungal spore happened to contaminate one of the bacteria cultures and grew into a fungal colony.

Detailed explanation-4: -Fleming realized that the bacteria near the mold were dying. He isolated the mold and identified it as Penicillium genus, which he found to be effective against all Gram-positive pathogens. Gram-positive pathogens cause diseases, such as diphtheria, gonorrhea, meningitis, pneumonia, and scarlet fever.

Detailed explanation-5: -Penicillin discovered Sir Alexander Fleming, a Scottish researcher, is credited with the discovery of penicillin in 1928. At the time, Fleming was experimenting with the influenza virus in the Laboratory of the Inoculation Department at St. Mary’s Hospital in London.