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chemosynthesis

(Encyclopedia)chemosynthesis, process in which carbohydrates are manufactured from carbon dioxide and water using chemical nutrients as the energy source, rather than the sunlight used for energy in photosynthesis....

Gros Ventre

(Encyclopedia)Gros Ventre grō văNˈtrə [key] [Fr.,=big belly], name used by the French for two quite distinct Native North American groups. One was the Atsina, a detached band of the Arapaho, whose language belo...

Pregl, Fritz

(Encyclopedia)Pregl, Fritz frĭts prāˈgəl [key], 1869–1930, Austrian physiologist and chemist, M.D. Univ. of Graz, 1894. He taught at the universities of Innsbruck (1910–13) and Graz (from 1913). For his met...

eclampsia

(Encyclopedia)eclampsia ĭklămpˈsēə [key], term applied to toxic complications that can occur late in pregnancy. Toxemia of pregnancy occurs in 10% to 20% of pregnant women; symptoms include headache, vertigo, ...

albino

(Encyclopedia)albino ălbīˈnō [key] [Port.,=white], animal or plant lacking normal pigmentation. The absence of pigment is observed in the body covering (skin, hair, and feathers) and in the iris of the eye. The...

chelating agents

(Encyclopedia)chelating agents kēˈlātĭng [key]. Certain organic compounds are capable of forming coordinate bonds (see chemical bond) with metals through two or more atoms of the organic compound; such organic ...

embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

hypertrophy

(Encyclopedia)hypertrophy hīpûrˈtrəfē [key], enlargement of a tissue or organ of the body resulting from an increase in the size of its cells. Such growth accompanies an increase in the functioning of the tiss...

horned lizard

(Encyclopedia)horned lizard or horned toad, broad, flat-bodied lizards of the genus Phrynosoma, found in arid regions from extreme SW Canada to Guatemala. There are several species in the United States W of the Mis...

hero, in Greek religion

(Encyclopedia)hero, in Greek religion, famous person, who after his death, was worshiped as quasi-divine. The heroes might be actual great men and women, real or imaginary ancestors, or “faded” gods and goddess...