Louis Pasteur discovers that the racemic form of tartaric acid is a mixture of the levorotatory and dextrotatory forms, thus clarifying the nature of optical rotation and advancing the field of stereochemistry.[47] 1852 August Beer proposes Beer's law, which explains the relationship between the...
Timeline of Life on Earth Using tests such as carbon dating, genetic evidence, and fossil records, scientists have gradually charted out a timeline of life on Earth. Great biologists such as Charles Darwin, Louis Pasteur, and Richard Dawkins have pushed forward new theories on how life on Earth...
Prior to the acceptance of the scientific method and its application to the field of chemistry, it is somewhat controversial to consider many of the people listed below as "chemists" in the modern sense of the word. However, the ideas of certain great thinkers, either for their prescience, o...
Handbook of Fruit Culture. Thomas Gregg. Louis Pasteur (1822-1895) announces theory that bacteria and germs cause infectious diseases. Wirt, Elizabeth Washington Wirt (1784-1857) Flora's Dictionary. 1858Jane Loudon (1807-1858). Writer, artist, gardener; wife and collaborator with John Loudon. ...
Find key developments in the field of medicine, from the birth of Hippocrates to today.460 BCEBirth of Hippocrates, Greek physician and founder of the first university. Considered the father of medicine.
Louis Pasteur (1822–1895) First recognition of bacteria as disease-causing agents. Developed field of immunochemistry. Introduced heat-sterilization of wine and milk (pasteurization). Saw optical isomers (enantiomers) in tartaric acid. William Sturgeon (1823) Invented the electromagnet. Sadi Carn...
Hadean Eon, informal division of the Precambrian occurring between about 4.6 billion and about 4.0 billion years ago. It was the time of Earth’s initial formation—the accretion of dust and gases, collisions with larger bodies, the stabilization of its