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Siegen, Ludwig von

(Encyclopedia)Siegen, Ludwig von lo͝otˈvĭkh fən zēˈgən [key], c.1609–1680, German engraver, b. Holland, educated in Germany. He is said to have invented (c.1640) the mezzotint process of engraving. Among h...

Copiapó

(Encyclopedia)Copiapó kōpyäpōˈ [key], city (1990 est. pop. 79,268), capital of Atacama region, N central Chile, on the Copiapó River. An industrial city at the southern edge of the Atacama Desert, Copiapó ha...

Drebbel, Cornelis Jacobszoon

(Encyclopedia)Drebbel, Cornelis Jacobszoon kôrnāˈlĭs yäˈkôpsōn drĕbˈəl [key], 1572–1634, Dutch inventor, physicist, and mechanician. His major inventions were an atmospherically driven clock and the fi...

Synge, Richard Laurence Millington

(Encyclopedia)Synge, Richard Laurence Millington, 1914–94, British biochemist, Ph.D. Cambridge, 1941. Synge was a researcher at the Lister Institute of Preventive Medicine, London, from 1943 to 1948 and at the Ro...

fertilization

(Encyclopedia)CE5 Fertilization of an egg cell fertilization, in biology, process in the reproduction of both plants and animals, involving the union of two unlike sex cells (gametes), the sperm and the ovum, f...

transmutation of elements

(Encyclopedia)transmutation of elements, conversion of one chemical element into another. The expression has both historical and contemporary significance. The transmutation of certain metals into gold by means of ...

quarrying

(Encyclopedia)quarrying, open, or surface, excavation of rock used for various purposes, including construction, ornamentation, road building, and as an industrial raw material. Rock that has been quarried is commo...

pharming

(Encyclopedia)pharming färˈmĭng [key], the use of genetically altered livestock, such as cows, goats, pigs, and chickens, to produce medically useful products. In pharming, researchers first create hybrid genes ...

yeast

(Encyclopedia)yeast, name applied specifically to a certain group of microscopic fungi and to commercial products consisting of masses of dried yeast cells or of yeast mixed with a starchy material and pressed into...