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White, Richard Grant

(Encyclopedia)White, Richard Grant, 1821–85, American journalist, writer, and Shakespearean scholar, b. New York City. He had a varied career and was at different times music critic and coeditor (1851–59) of th...

Kelvin temperature scale

(Encyclopedia)Kelvin temperature scale, a temperature scale having an absolute zero below which temperatures do not exist. Absolute zero, or 0K, is the temperature at which molecular energy is a minimum, and it c...

chlorophyll

(Encyclopedia)CE5 chlorophyll klôrˈəfĭlˌ [key], green pigment that gives most plants their color and enables them to carry on the process of photosynthesis. Chemically, chlorophyll has several similar forms...

stereochemistry

(Encyclopedia)stereochemistry, study of the three-dimensional configuration of the atoms that make up a molecule and the ways in which this arrangement affects the physical and chemical properties of the molecule. ...

Archimedes

(Encyclopedia)Archimedes ärkĭmēˈdēz [key], 287–212 b.c., Greek mathematician, physicist, and inventor. He is famous for his work in geometry (on the circle, sphere, cylinder, and parabola), physics, mechanic...

Swinburne, Algernon Charles

(Encyclopedia)Swinburne, Algernon Charles, 1837–1909, English poet and critic. His poetry is noted for its vitality and for the music of its language. After attending Eton (1849–53) and Oxford (1856–60) he se...

ion, in chemistry

(Encyclopedia)ion, atom or group of atoms having a net electric charge. Ionization has many applications. Vapor lamps and fluorescent lamps take advantage of the light given off when positive ions recombine with ...

nutrition

(Encyclopedia)nutrition, study of the materials that nourish an organism and of the manner in which the separate components are used for maintenance, repair, growth, and reproduction. Nutrition is achieved in vario...

Ariès, Philippe

(Encyclopedia)Ariès, Philippe, 1914–84, French cultural historian, b. Paris. While at the Sorbonne, he failed a crucial exam necessary for a university career, and instead became an agronomic researcher and late...

Loire, river, France

(Encyclopedia)Loire, longest river of France, c.630 mi (1,010 km) long, rising in the Cévennes Mts., SE France, and flowing in an arc through central and W France to the Atlantic Ocean at Saint-Nazaire. The upper ...