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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 ...

Newcastle upon Tyne

(Encyclopedia)Newcastle upon Tyne, city and metropolitan borough (1991 pop. 199,064), NE England, on the Tyne River. The city is an important shipping and trade center. The famous coal-shipping industry began in th...

Le Pen, Jean-Marie

(Encyclopedia)Le Pen, Jean-Marie zhŏnˌ-märēˈ lə pĕn, pŏN [key], 1928–, French politician. He graduated from law school, was elected (1956) a parliamentary deputy, and criticized President de Gaulle's Alge...

lancelet

(Encyclopedia)lancelet, name for small, fishlike lower chordate (see Chordata), also called amphioxus; it shows many affinities with the vertebrates. There are about 30 lancelet species, most belonging to the genus...

Sulu Archipelago

(Encyclopedia)Sulu Archipelago so͞oˈlo͞o [key], island group, 1,086 sq mi (2,813 sq km), the Philippines, SW of Mindanao. Lying between the Celebes and Sulu seas, it includes over 900 volcanic islands and coral ...

brine shrimp

(Encyclopedia)brine shrimp, common name for a primitive crustacean that seldom reaches more than 1⁄2 in. (1.3 cm) in length and is commonly used for fish food in aquariums. Brine shrimp, which are not closely rel...

sea urchin

(Encyclopedia)sea urchin, spherical-shaped echinoderm with movable spines covering the body. The body wall is a firm, globose shell, or test, made of fused skeletal plates and marked by regularly arranged tubercles...

rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

ameba

(Encyclopedia)ameba or amoeba both: əmēˈbə [key], common name for certain one-celled organisms belonging to the phylum Sarcodina of the kingdom Protista. Amebas were previously classified as members of the anim...

pompano

(Encyclopedia)pompano pŏmˈpənō [key], common name for fishes of the genus Trachinotus, members of a large and important family (Carangidae) of mackerellike fishes, abundant in warm seas around the world. They h...