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Penicillin has a molecular formula R-C9H11N2O4S, where R is a variable side chain.
Penicillin was originally isolated from the Penicillium chrysogenum (formerly Penicillium notatum) mould. The antibiotic effect was originally discovered by a young French medical student Ernest Duchesne studying Penicillium glaucum in 1896 but his work had no lasting consequences.
It was later rediscovered in 1928 by Alexander Fleming who noticed a halo of inhibition of bacterial growth in a culture of Staphylococcus around a contaminant blue-green mould. From the culture plate, Fleming concluded that the mould was releasing a substance that was inhibiting bacterial growth. He grew a pure culture and discovered that the fungus was Penicillium notatum - he later named the bacterial inhibiting substance penicillin after the Penicillum notatum that released it. Unfortunately, Fleming was convinced after conducting some more experiments that penicillin could not last long enough in the human body to kill pathogenic bacteria and stopped studying penicillin after 1931. It would prove to be the discovery that changed modern medicine.
The chemical structure of penicillin was determined by Dorothy Crowfoot Hodgkin, enabling synthetic production. A team of Oxford research scientists led by Australian Howard Walter Florey and including Ernst Boris Chain and Norman Heatley discovered a method of mass producing the drug. Florey and Chain shared the 1945Events January January 5 The Soviet Union recognizes the new pro-Soviet government of Poland. January 7 British General Bernard Montgomery holds a press conference in which he claims credit for victory in the Battle of the Bulge. January 12 World War II: Nobel prize in medicineList of Nobel Prize laureates in Physiology or Medicine from 1901 to the present day. 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s External links http://www. se/medicin with Fleming for this work. Penicillin has since become the most widely used antibiotic to date and is still used for many Gram-positive bacterial infections.
Main article: beta-lactam antibiotic
Penicillin and other ß-lactam antibiotics work by inhibiting the formation of peptidoglycanPeptidoglycan also known as murein, is a homogenous layer lying outside the plasma membrane in prokaryotes. The peptidoglycan layer is thicker in Gram-positive bacteria (20 to 80 nm) than in Gram-negative bacteria (7 to 8 nm). It forms around 90% and 10% cross links in the bacterial cell wallA cell wall is a more or less solid layer surrounding a cell. They are found in most bacteria, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls. When a plant or fungal cell wall is removed using. The beta-lactamBeta-lactam in a heteroatomic ring structure, consisting of three carbon atoms and one nitrogen atom (Fig. The beta-lactam ring is part of several antibiotics, such as penicillin, which are therefore also called beta-lactam antibiotics''. These antibiotic moiety of penicillin binds to the enzyme that links the peptidoglycan molecules in bacteria and prevents the bacteria from multiplying (or rather causing cell lysis or death when the bacteria tries to divide).