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etching
(Encyclopedia) etching, the art of engraving with acid on metal; also the print taken from the metal plate so engraved. In hard-ground etching the plate, usually of copper or zinc, is given a thin…embryo screening
(Encyclopedia) embryo screening, procedure (see genetic testing) in which a single cell is removed from an embryo two or three days after it has been conceived through in vitro fertilization and…covenant
(Encyclopedia) covenantcovenantkŭvˈənənt [key], agreement entered into voluntarily by two or more parties to do or refrain from doing certain acts. In the Bible and in theology the covenant is the…dialysis
(Encyclopedia) dialysisdialysisdīălˈĭsĭs [key], in chemistry, transfer of solute (dissolved solids) across a semipermeable membrane. Strictly speaking, dialysis refers only to the transfer of the…chain reaction
(Encyclopedia) CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause…Romains, Jules
(Encyclopedia) Romains, JulesRomains, Juleszhül rômăNˈ [key], 1885–1972, French writer, whose original name was Louis Farigoule. A brilliant student of philosophy, he became known as the chief…Rugby, town, England
(Encyclopedia) Rugby, town (1991 pop. 59,039), Warwickshire, central England. An important railroad junction and engineering center, Rugby is the seat of one of England's most esteemed public schools…specific heat
(Encyclopedia) specific heat, ratio of the heat capacity of a substance to the heat capacity of a reference substance, usually water. Heat capacity is the amount of heat needed to change the…Rank, Otto
(Encyclopedia) Rank, OttoRank, Ottoôtˈō rängk [key], 1884–1937, Austrian psychoanalyst; one of Sigmund Freud's first and most valued pupils. He early employed Freudian techniques to clarify the…license
(Encyclopedia) license, in public law, permission by legal authority to engage in certain acts and also the document showing such permission. Some licenses are required for the protection of the…Trending
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