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anxiety

(Encyclopedia)anxiety, anticipatory tension or vague dread persisting in the absence of a specific threat. In contrast to fear, which is a realistic reaction to actual danger, anxiety is generally related to an unc...

Hardenberg, Karl August, Fürst von

(Encyclopedia)Hardenberg, Karl August, Fürst von kärl ouˈgo͝ost fürst fən härˈdənbĕrk [key], 1750–1822, Prussian administrator and diplomat, b. Hanover. After service for Hanover and Brunswick, he enter...

Fortas, Abe

(Encyclopedia)Fortas, Abe fôrˈtəs [key], 1910–82, associate justice of the U.S. Supreme Court (1965–69), b. Memphis, Tenn. After receiving his law degree from Yale in 1933, he taught there (1933–37) and al...

fluorescence

(Encyclopedia)fluorescence flo͝orĕsˈəns [key], luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms of electromagnetic radiation or ...

National Forest System

(Encyclopedia)National Forest System, federally owned reserves, c.191 million acres (77.4 million hectares), administered by the Forest Service of the U.S. Dept. of Agriculture. The system is made up of 155 nationa...

neutron star

(Encyclopedia)neutron star, extremely small, extremely dense star, with as much as double the sun's mass but only a few miles in radius, in the final stage of stellar evolution. Astronomers Baade and Zwicky predict...

nitric oxide

(Encyclopedia)nitric oxide or nitrogen monoxide, a colorless gas formed by the combustion of nitrogen and oxygen as given by the reaction: energy + N2 + O2 → 2NO; m.p. −163.6℃; b.p. −151.8℃. Nitric oxide ...

nonmetal

(Encyclopedia)nonmetal, chemical element possessing certain properties by which it is distinguished from a metal. In general, this distinction is drawn on the basis that a nonmetal tends to accept electrons and for...

Palacký, František

(Encyclopedia)Palacký, František fränˈtyĭshĕk päˈlätskē [key], 1798–1876, Czech nationalist and historian, b. Moravia. Regarded as the father of the modern Czech nation, Palacký played a leading role i...

Ledru-Rollin, Alexandre Auguste

(Encyclopedia)Ledru-Rollin, Alexandre Auguste älĕksäNˈdrə ôgüstˈ lədrüˈ-rôlăNˈ [key], 1807–74, French politician. A lawyer, he first became known as a radical opponent to the accession (1830) of Lou...