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half-life
(Encyclopedia) half-life, measure of the average lifetime of a radioactive substance (see radioactivity) or an unstable subatomic particle. One half-life is the time required for one half of any…Holy Spirit
(Encyclopedia) Holy Spirit or Holy Ghost [ghost, i.e., spirit, a translation of Gr. pneuma=breath, air], in Christian doctrine, the third person of the Trinity. The Holy Spirit is sometimes defined…matrix
(Encyclopedia) matrix, in mathematics, a rectangular array of elements (e.g., numbers) considered as a single entity. A matrix is distinguished by the number of rows and columns it contains. The…Claude, Albert
(Encyclopedia) Claude, AlbertClaude, Albertälbârrˈ klōd [key], 1899–1983, Belgian biologist, b. Longlier, M.D., Univ. of Liège, 1928. He joined the Rockefeller Institute (now Rockefeller Univ.) in…Alhambra, Moorish citadel, Spain
(Encyclopedia) Alhambra [Arab.,=the red], extensive group of buildings on a hill overlooking Granada, Spain. They were built chiefly between 1230 and 1354 and they formed a great citadel of the…digital-to-analog conversion
(Encyclopedia) digital-to-analog or D/A conversion, the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference. There are two types of…dithyramb
(Encyclopedia) dithyrambdithyrambdĭthˈĭrăm [key], in ancient Greece, hymn to the god Dionysus, choral lyric with exchanges between the leader and the chorus. It arose, probably, in the extemporaneous…myosin
(Encyclopedia) myosinmyosinmīˈəsĭn [key], one of the two major protein constituents responsible for contraction of muscle. In muscle cells myosin is arranged in long filaments called thick filaments…mood
(Encyclopedia) mood or mode, in verb inflection, the forms of a verb that indicate its manner of doing or being. In English the forms are called indicative (for direct statement or question or to…substance
(Encyclopedia) substance, in philosophy, term used to denote the changeless substratum presumed in some philosophies to be present in all being. Aristotle defined substance as that which possesses…Trending
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