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The phenomenon with the rising chain was already described in 2011 as an open problem [note 1] for the 2012 International Young Physicists' Tournament (IYPT) [6] [4] and subsequently brought to widespread public attention in a video made by science presenter Steve Mould (namesake of the effect) in 2013. [7]
Sample of penicillin mould presented by Alexander Fleming to Douglas Macleod in 1935. The discovery of penicillin was one of the most important scientific discoveries in the history of medicine. Ancient societies used moulds to treat infections and in the following centuries many people observed the inhibition of bacterial growth by moulds.
Steve Mould (born 5 October 1978) is a British educational YouTuber, author, [2] and science presenter who is most notable for making science-related educational videos on his YouTube channel. Early life
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Fleming was the first to discover the properties of the active substance, giving him the privilege of naming it: penicillin. He also kept, grew, and distributed the original mould for twelve years, and continued until 1940 to try to get help from any chemist who had enough skill to make penicillin.
On 6 December 1943, the Reich Health Ministry ordered the medical community to conduct research into penicillin and other antibiotics. [134] Three vials of penicillin captured by the Afrika Korps reached Germany in 1943 and one was sent to Heinz Öppinger at Hoechst in Frankfurt, and he began conducting experiments with moulds. Penicillin was ...
Mold spores are drawn to specific environments, making it easier for them to grow. These spores will usually only turn into a full-blown outbreak if certain conditions are met. [32] Various practices can be followed to mitigate mold issues in buildings, the most important of which is to reduce moisture levels that can facilitate mold growth. [27]
The original Proctor test, ASTM D698 / AASHTO T99, uses a 4-inch-diameter (100 mm) by 4.584-inch-high (116.4 mm) mold which holds 1/30 cubic feet of soil, and calls for compaction of three separate lifts of soil using 25 blows by a 5.5 lb hammer falling 12 inches, for a compactive effort of 12,375 ft-lbf/ft 3.