Oxygen [SEP] discoverer or inventor
helps protect the biosphere from ultraviolet radiation. However, ozone present at the surface is a byproduct of smog and thus a pollutant.
Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774. Priority is often given for Priestley because his work was published first. Priestley, however, called oxygen "dephlogisticated air", and did not recognize it as a chemical
Hopfield
Hopfield may refer to:
- A field used for cultivating hops
- Hopfield net, a type of neural network
- John Joseph Hopfield (born 1933), American biologist and physicist, inventor of the Hopfield net
- John J. Hopfield (spectroscopist) (1891–1953), American spectroscopist, discoverer of the Hopfield bands of oxygen and co-discoverer of the Lyman-Birge-Hopfield bands of nitrogen
- Hopfield bands, one of the important molecular oxygen absorption bands
- Lyman-Birge-