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Chronology of discoveries U.S.
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1831 Discovery of chloroform
Chloroform is a chemical compound known as trihalomethanes that do not undergo combustion in air, but it will burn when mixed with more flammable substances. Chloroform was discovered in July 1831 by Samuel Guthrie American physician, independently a few months later by the French chemist Eugne Soubeiran, then by the German chemist Justus von Liebig.
1859 Discovery of petroleum jelly
Petroleum jelly, petrolatum or soft paraffin is a semi-solid mixture of hydrocarbons originally promoted as a salve for its healing properties. The raw material for petroleum jelly was discovered in 1859 by Robert Chesebrough, a chemist in New York. In 1870, this product has been labeled as Vaseline petroleum jelly.
1873 Discovery of the chemical potential
In thermodynamics, physics and chemistry, the chemical potential, symbolized by, is a term introduced by the American engineer, chemist, physicist Josiah Gibbs and mathematics in his 1873 paper a method of geometric representation of thermodynamic properties of substances through surfaces.
1877 Discovery of Deimos
Deimos is the smaller and outer two moons of Mars. It was discovered by Asaph Hall in 1877.
1877 Discovery of Phobos
Phobos is the larger and closer of Mars' two small moons. It was discovered by Asaph Hall in 1877.
1891 Discovery of Amalthea
Amalthea is the third moon of Jupiter in the order of the distance of the planet. It was discovered September 9, 1892, by Edward Emerson Barnard.
Discovered in 1899 by Phoebe
Phoebe is an irregular satellite of Saturn. It was discovered by William Henry Pickering March 17, 1899 photographic plates taken from the August 16, 1898 in Arequipa, Peru by DeLisle Stewart.
1908 Discovery of Seyfert galaxies
Seyfert galaxies are a class of galaxies with nuclei that produce greenhouse gas emissions from highly ionized spectral lines, named after Carl Seyfert Keenan, the astronomer who first identified the class in 1943 but they were first was discovered by Edward A. Fath in 1908 when he was at the Lick Observatory.
1910 Discovery of propane
Propane is a three-carbon alkane, normally a gas, but compressible to a liquid transportable. It is derived from other petroleum products during oil or natural gas processing. It is commonly used as fuel for engines, barbecues, portable stoves and residential heating. Propane was first identified as a volatile component of gasoline by Dr Walter O. Snelling of the U.S. Bureau of Mines in 1910.
1912 Discovery of smoking cancer link
Dr. Isaac Adler was the first to strongly suggest that lung cancer is related to smoking in 1912.
1914 Discovery of Sinope
Sinop is a retrograde irregular satellite of Jupiter discovered by Seth Barnes Nicholson at Lick Observatory in 1914.
1915 Discovery of the Zener diode
A Zener diode is a type of diode which allows current in the forward direction like a normal diode, but in the opposite direction if the voltage exceeds the breakdown voltage known as "Zener knee voltage" or " Zener voltage ". The device was named after Clarence Zener, who discovered this electrical property.
1916 Discovery of the covalent bond
The idea of a covalent bond can be traced for several years to Gilbert N. Lewis, who in 1916 described the sharing of pairs of electrons between atoms. It introduces the notation called Lewis or electron dot notation or Lewis dot structure in which the valence electrons are represented by dots around the atomic symbols.
1916 Discovery of Heparin
Heparin, a highly sulfated glycosaminoglycan, is widely used injectable anticoagulant and has the highest negative charge density of any known biological molecule. It can also be used to form an anti-domestic.