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Giants of Science: Alexander Fleming

Feb 27,2015 by Edulab

In our Giants of Science, we take a closer look at the Nobel laureate winning Sir Alexander Fleming, and see how his ground-breaking discoveries changed the face of modern medicine.

Sir Alexander Fleming was born in August 1881 in the Scottish county of Ayrshire. He later moved to London, where he trained as a doctor at St. Mary’s Medical School. After qualifying with a distinction, he went on to conduct research at the university under the direction of Sir Almroth Wright, who was aslo a pioneer in vaccine therapies.

During World War I, he served in the army medical corp and worked on the bacteriology of septic wounds.

Following the war he returned to St. Mary’s to continue his research. His first major discovery came in 1921, when he discovered that a particular enzyme present in bodily fluids, known as Lysozyme, possessed some mild antiseptic properties.

His next major breakthrough came in 1928 when working on the influenza virus, he noticed that a mould had accidentally developed on a culture dish that was being utilised to culture the Staphylococcus. Significantly, the mould had created a bacteria free circle around itself.

Inspired by this, Fleming went conducted several further experiments which demonstrated that the mould culture prevented the growth of Staphylococci. After first naming this substance ‘mould juice’, he eventually settled on the more conventional name of ‘Penicillin’ after the mould that produced it. Of his discovery, he is famously quoted as stating:

“When I woke up just after dawn on September 28, 1928, I certainly didn’t plan to revolutionize all medicine by discovering the world’s first antibiotic, or bacteria killer…but I guess that was exactly what I did”.

Attempts were immediately made to extract Penicillin for medical use; however, these were initially unsuccessful, and it was to be some years later before Penicillin was effectively harnessed for medical use.

Then, in 1939, two researchers from the University of Oxford, Howard Florey and Ernst Chain, began working on Penicillin, and were able to isolate and purify this substance further, meaning that it could be used as a clinically useful drug.

Although the first supplies of Penicillin remained limited, by the 1940s this so called ‘wonder drug’ was being mass produced by the American pharmaceutical industry, and it became a lifesaver during World War II.

During his lifetime, Alexander Fleming also wrote a number of papers on bacteriology, chemotherapy and immunology, which were published in leading scientific and medical journals.

In 1943 he was elected as a fellow of the Royal Society and was knighted a year later in 1944.

Finally, in 1945, he was jointly awarded the Nobel Prize for Medicine with Florey and Chain.

Alexander Fleming is undoubtedly one of the most famous scientists of all time; his ground-breaking work helped save many lives and he remains an international hero.

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