Learn about the history of science by reading about the significant scientific events that took place on this day in history.
1964 - Hans von Euler-Chelpin died.
Nobel Prize Foundation
Euler-Chelpin was a Swedish biochemist who shares the 1929 Nobel Prize in Chemistry with Arthur Harden for their investigations into the process of fermentation and the actions of enzymes during fermentation. His research concerned the action of enzymes on a substrate is a bond between an acid group and a alkaline group. He isolated the cozymase, the coenzyme of the yeast enzyme zymase, and determined its structure.
1822 - Claude Louis Berthollet died.
Wikimedia Commons
Berthollet was a French chemist who introduced the use of chlorine based bleach as a dye. He also argued against the law of definite proportions where chemicals combine in whole number ratios. Non-stoichiometric compounds are called berthollides in his honor.
1638 - James Gregory was born.
Gregory was a Scottish astronomer and mathematician who invented the reflecting telescope. He described his Gregorian reflector telescope but never successfully built one. Robert Hooke constructed the first successful working model. He also was the first to describe a method to determine the distance to Venus by timing the transit of the planet across the face of the Sun.
