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Rh factor

(Encyclopedia)Rh factor, protein substance present in the red blood cells of most people, capable of inducing intense antigenic reactions. The Rh, or rhesus, factor was discovered in 1940 by K. Landsteiner and A. S...

Valtellina

(Encyclopedia)Valtellina vältāl-lēˈnä [key], Alpine valley of the upper Adda River, c.75 mi (120 km) long, in Lombardy, N Italy, extending from Lake Como to the Stelvio Pass. The main towns are Sondrio and Tir...

William I, emperor of Germany and king of Prussia

(Encyclopedia)William I, 1797–1888, emperor of Germany (1871–88) and king of Prussia (1861–88), second son of the future King Frederick William III of Prussia and Louise of Mecklenburg. Essentially conservati...

earthquake

(Encyclopedia)CE5 Worldwide pattern of earthquake activity: The dots indicate the epicenters of all earthquakes recorded during a recent 10-year period. CE5 earthquake, trembling or shaking movement of the ea...

dialysis

(Encyclopedia)dialysis dīălˈĭsĭs [key], in chemistry, transfer of solute (dissolved solids) across a semipermeable membrane. Strictly speaking, dialysis refers only to the transfer of the solute; transfer of t...

astrology

(Encyclopedia)astrology, form of divination based on the theory that the movements of the celestial bodies—the stars, the planets, the sun, and the moon—influence human affairs and determine the course of event...

hemophilia

(Encyclopedia)hemophilia hēˌməfĭlˈēə, –fēlˈyə [key], genetic disease in which the clotting ability of the blood is impaired and excessive bleeding results. The disease is transmitted through females but...

gene therapy

(Encyclopedia)gene therapy, the use of genes and the techniques of genetic engineering in the treatment of a genetic disorder or chronic disease. There are many techniques of gene therapy, all of them still in expe...

loom

(Encyclopedia)loom, frame or machine used for weaving; there is evidence that the loom has been in use since 4400 b.c. Modern looms are of two types, those with a shuttle (the part that carries the weft through the...

gun control

(Encyclopedia)gun control, government limitation of the purchase and ownership of firearms. The availability of guns is controlled by nations and localities throughout the world. In the United States the “right o...