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Bomu

(Encyclopedia) BomuBomubōˈm&oomacr; [key], river, c.500 mi (800 km) long, rising in NE Congo (Kinshasa) and flowing generally westward. It forms part of the Congo–Central African Republic border…

Ceredigion

(Encyclopedia) Ceredigion, county, 694 sq mi (1,797 sq km), W Wales. Ceredigion, corresponding to the former county of Cardiganshire, was established in 1996 when the nonmetropolitan county of Dyfed…

mass spectrograph

(Encyclopedia) mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the…

Mazowiecki, Tadeusz

(Encyclopedia) Mazowiecki, TadeuszMazowiecki, Tadeusztädāˈ&oomacr;sh mäzōvēĕtˈskē [key], 1927–2013, Polish journalist and political leader, prime minister of Poland (Aug., 1989– Jan., 1991). He…

apparition

(Encyclopedia) apparition, spiritualistic manifestation of a person or object in which a form not actually present is seen with such intensity that belief in its reality is created. The ancient and…

chymotrypsin

(Encyclopedia) chymotrypsinchymotrypsinkīˌmōtrĭpˈsĭn [key], proteolytic, or protein-digesting, enzyme active in the mammalian intestinal tract. It catalyzes the hydrolysis of proteins, degrading them…

quaternion

(Encyclopedia) quaternionquaternionkwətûrˈnēən [key], in mathematics, a type of higher complex number first suggested by Sir William R. Hamilton in 1843. A complex number is a number of the form a+bi…

Renzi, Matteo

(Encyclopedia) Renzi, Matteo, 1975–, Italian political leader. Renzi was a member of the Italian People's party, which merged (2002) with other parties to form Democracy Is Freedom—The Daisy, which…

phospholipid

(Encyclopedia) phospholipidphospholipidfŏsˌfōlĭpˈĭd [key], lipid that in its simplest form is composed of glycerol bonded to two fatty acids and a phosphate group. The resulting compound called…

adenine

(Encyclopedia) adenineadenineădˈənĭn, –nīn, –nēn [key], organic base of the purine family. Adenine combines with the sugar ribose to form adenosine, which in turn can be bonded with from one to three…