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water

(Encyclopedia)CE5 A. Water molecule (black circles represent valence-shell electrons) B. Structure of ice: Each oxygen atom (white circles) is bonded to four other oxygen atoms by hydrogen bonds, the hydrogen at...

protein

(Encyclopedia)protein, any of the group of highly complex organic compounds found in all living cells and comprising the most abundant class of all biological molecules. Protein comprises approximately 50% of cellu...

gem, ornamental mineral or organic substance

(Encyclopedia)gem, commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see mont...

English language

(Encyclopedia)English language, member of the West Germanic group of the Germanic subfamily of the Indo-European family of languages (see Germanic languages). Spoken by about 470 million people throughout the world...

modern architecture

(Encyclopedia)modern architecture, new architectural style that emerged in many Western countries in the decade after World War I. It was based on the “rational” use of modern materials, the principles of funct...

Islamic art and architecture

(Encyclopedia)Islamic art and architecture, works of art and architecture created in countries where Islam has been dominant and embodying Muslim precepts in its themes. Among the ceramic types are unglazed wares...

museums of art

(Encyclopedia)museums of art, institutions or buildings where works of art are kept for display or safekeeping. The word museum derives from the Greek mouseion, meaning temple to the works of the Muses. This articl...

radio

(Encyclopedia)CE5 A. AM transmitter B. AM receiver radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially...

dating

(Encyclopedia)dating, the determination of the age of an object, of a natural phenomenon, or of a series of events. There are two basic types of dating methods, relative and absolute. In relative dating, the tempor...

motion picture photography

(Encyclopedia)motion picture photography or cinematography, photographic arts and techniques involved in making motion pictures. See also photography, still. Cinematography developed as a separate craft ve...