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electromagnetic radiation

(Encyclopedia)CE5 Electromagnetic spectrum electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if ...

commercial law

(Encyclopedia)commercial law, the laws that govern business transactions, except those relating to the maritime transportation of goods (see maritime law). Commercial law developed as a distinct body of jurispruden...

poliomyelitis

(Encyclopedia)poliomyelitis pōˌlēōmīˌəlīˈtĭs [key], polio, or infantile paralysis, acute viral infection, mainly of children but also affecting older persons. Historically, there were three immunologic ty...

Rossetti, Dante Gabriel

(Encyclopedia)Rossetti, Dante Gabriel rōsĕtˈē [key], 1828–82, English poet and painter; son of Gabriele Rossetti and brother of Christina Rossetti. He attended the Royal Academy and studied painting briefly ...

quantum electrodynamics

(Encyclopedia)quantum electrodynamics (QED), quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the framework of quantum theory. ...

cathedral

(Encyclopedia)CE5 Floor plan of a cathedral cathedral, church in which a bishop presides. The designation is not dependent on the size or magnificence of a church edifice, but is entirely a matter of its assign...

sodium chloride

(Encyclopedia)sodium chloride, NaCl, common salt. Salt is important in many ways. It is an essential part of the diet of both humans and animals and is a part of most animal fluids, such as blood, sweat, and te...

Dutch art

(Encyclopedia)Dutch art, the art of the region that is now the Netherlands. As a distinct national style, this art dates from about the turn of the 17th cent., when the country emerged as a political entity and dev...

Italian literature

(Encyclopedia)Italian literature, writings in the Italian language, as distinct from earlier works in Latin and French. In the second half of the 19th cent. Francesco De Sanctis, literary critic and historian, la...

land use

(Encyclopedia)land use, exploitation of land for agricultural, industrial, residential, recreational, or other purposes. Because the United States historically has a laissez-faire attitude toward land use, the land...