| Obradovic, Dositej ... Occidental, Cordillera |
| | - Obradovic, Dositej
- (from the article "Serbian literature") No significant revival of Serbian culture and literature occurred until the 18th century. The most important representative of the Enlightenment period was Dositej Obradovic, whose writings greatly influenced Serbian literary development. A man of great learning and a polyglot who ...
- Obraztsov, Sergey Vladimirovich
- puppet master who established puppetry as an art form in the Soviet Union and who is considered to be one of the greatest puppeteers of the 20th century. [2 Related Articles]
- Obrecht, Jakob
- composer who, with Jean d'Ockeghem and Josquin des Prez, was one of the leading composers in the preeminently vocal and contrapuntal Franco-Flemish, or Franco-Netherlandish, style that dominated Renaissance music. [1 Related Articles]
- Obregon, Alejandro
- (from the article "Latin American art") ...a technique that bypassed logical composition and went directly to the intuitive, recalling Zen techniques and the work of Abstract Expressionist Jackson Pollock. During this same period Alejandro Obregon of Colombia painted sensuously beautiful canvases that initially seem abstract but, ...
- Obregon, Alvaro
- soldier, statesman, and reformer who, as president, restored order to Mexico after a decade of political upheavals and civil war that followed the revolution of 1910. [4 Related Articles]
- Obregon, Jose
- (from the article "Latin American art") ...and 1848. Felix Parra also painted historical scenes of the conquest, empathizing with the suffering of the indigenous people. In The Discovery of Pulque (1869), Jose Obregon adapted the architecture represented in pre-Columbian Mixtec codices, but he ...
- Obrenovic dynasty
- family that provided Serbia with five rulers between 1815 and 1903. Their succession was broken by a rival dynasty, the Karadjordjevic. Milos, who founded the dynasty, was prince of Serbia from 1815 to 1839 and again from 1858 to 1860; ... [4 Related Articles]
- Obrigheim
- (from the article "The Environment") The Obrigheim nuclear reactor closed down on May 11. The 36-year-old 340-MW plant was the oldest in Germany and was the second of the original 19 reactors in the country to close under Germany's plan to phase out nuclear power ...
- Obscene Publications Act
- in British law, either of two codifications of prohibitions against obscene literature adopted in 1857 and in much revised form in 1959. The earlier act, also called Lord Campbell's Act (one of several laws named after chief justice and chancellor ... [1 Related Articles]
- obscenity
- legal concept used to characterize certain (particularly sexual) material as offensive to the public sense of decency. A wholly satisfactory definition of obscenity is elusive, however, largely because what is considered obscene is often, like beauty, in the eye of ... [4 Related Articles]
- observable
- (from the article "quantum mechanics") ...equations form an important part of quantum mechanics, it is possible to present the subject in a more general way. Dirac gave an elegant exposition of an axiomatic approach based on observables and states in a classic textbook entitled The ...
- observation
- (from the article "Carnap, Rudolf") ...in purely experiential terms but can at least be partly defined by means of "reduction sentences," which are logically much-refined versions of operational definitions, and "observation sentences," whose truth can be checked by direct observation. Carnap stressed that usually such ...
- observation trial
- (from the article "motorcycle trial") The second form of motorcycle trial includes observation trials, which are run over hazard-strewn terrain, often uphill, that has been divided into observed sections. The goal is to negotiate these sections without losing points for touching the ground with any ...
- observational error
- (from the article "operations research") Two kinds of error are involved in search: those of observation and those of sampling. Observational errors, in turn, are of two general types: commission, seeing something that is not there; and omission, not seeing something that is there. In ...
- observational learning
- (from the article "motivation") In the third type of learning technique, observational learning, or modeling, a new behaviour is learned simply by watching someone else behave. In a very real sense, such learning is the ability to profit from another's successes or mistakes. This ...
- Observatory House
- (from the article "astronomical observatory") One notable observatory built and operated by an individual was that of William Herschel, assisted by his sister Caroline, in Slough, Eng. Known as Observatory House, its largest instrument had a mirror made of speculum metal, with a diameter of ...
- Observer, The
- Sunday newspaper established in 1791, the first Sunday paper published in Britain. It is one of England's quality newspapers, long noted for its emphasis on foreign coverage. The paper devotes extensive space to the arts, government, education, and politics, and ... [1 Related Articles]
- obsessive-compulsive disorder
- type of mental disorder in which an individual experiences obsessions or compulsions or both. Either the obsessive thought or the compulsive act may occur singly, or both may appear in sequence. [6 Related Articles]
- obsessive-compulsive personality disorder
- (from the article "mental disorder") A person with this disorder shows prominent overscrupulous, perfectionistic traits that are expressed in feelings of insecurity, self-doubt, meticulous conscientiousness, indecisiveness, excessive orderliness, and rigidity of behaviour. The person is preoccupied with rules and procedures as ends in themselves. Such ...
- obshchina
- (from the article "Russia") ...the most powerful person at this level, who was assisted by an elder elected by an assembly of householders. The lowest effective centre of power was the village commune (obshchina), an institution of uncertain origin but great ...
- obsidian
- natural glass of volcanic origin that is formed by the rapid cooling of viscous lava. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite. Obsidian has ... [9 Related Articles]
- obsidian-hydration-rim dating
- (from the article "geochronology") In a specific environment the process of obsidian hydration is theoretically described by the equation D = Kt1/2, in which D is thickness of the hydration rim, K is a constant characteristic of the environment, and t is the time ...
- obstetrics and gynecology
- medical/surgical specialty concerned with the care of women from pregnancy until after delivery and with the diagnosis and treatment of disorders of the female reproductive tract. [7 Related Articles]
- Obstfelder, Sigbjorn
- Norwegian Symbolist poet whose unrhymed verse and atmospheric, unfocused imagery marked Norwegian poets' decisive break with naturalistic verse.
- obstructionism
- (from the article "Parnell, Charles Stewart") ...its first president, thus becoming the centre of the great "new departure" national movement in which revolutionary devotion was combined with agrarian agitation and was supported by the obstructionist tactics of the "active section" in Parliament. Soon after the general ...
- obstructive atelectasis
- (from the article "atelectasis") Obstructive atelectasis may be caused by foreign objects lodged in one of the major bronchial passageways, causing air trapped in the alveoli to be slowly absorbed by the blood. It may also occur as a complication of abdominal surgery. The ...
- obtect pupa
- (from the article "insect") ...eruciform (caterpillar-like), scarabaeiform (grublike), campodeiform (elongated, flattened, and active), elateriform (wireworm-like), and vermiform (maggot-like). The three types of pupae are: obtect, with appendages more or less glued to the body; exarate, with the appendages free and not glued to the ...
- obturator
- (from the article "speech disorder") When surgical repair is not feasible, the palatal defect may be covered by a special prosthetic plate (obturator) similar to false dental appliances. This technique has been known for many centuries, and various models of obturators have been constructed in ...
- obturator nerve
- (from the article "nervous system, human") ...foramen; motor branches proceed to the obturator internus and gracilis muscles as well as the adductor muscles, while sensory branches supply the articular capsule of the knee joint. An accessory obturator nerve supplies the pectineus muscle of the thigh and ...
- Obuasi
- town, southern Ghana. Its growth was stimulated by the discovery of a large gold deposit in 1897 and the building of the railway from Sekondi in 1902. The Asante gold mine at Obuasi has continued as the country's major producer ...
- Obuchi Keizo
- Japanese politician who was prime minister from July 1998 to April 2000 and is credited with reversing Japan's economic downturn. [2 Related Articles]
- obung
- (from the article "Efik") The obung, or chief, elected from among the heads of various Houses, traditionally exercised his authority as head of the Ekpe (Egbo), or Leopard, society. In addition to ritual propitiation of forest spirits to ensure the well-being ...
- Obunumankoma
- (from the article "Bono") The kings of Bono are said to have played a major role in the gold-mining industry: both Obunumankoma (fl. c. 1450-75) and 'Ali Kwame (fl. c. 1550-60) are thought to have introduced new mining techniques from the western Sudan to ...
- obversion
- in syllogistic, or traditional, logic, transformation of a categorical proposition (q.v.), or statement, into a new proposition in which (1) the subject term is unchanged, (2) the predicate is replaced by its contradictory, and (3) the quality of the proposition ... [2 Related Articles]
- Obwalden
- Halbkanton (demicanton), central Switzerland, formerly part of the canton of Unterwalden. The demicanton is drained by the Sarner River and occupies the western part of former Unterwalden canton. Obwalden means "above the forest" and refers to the great forest of ... [2 Related Articles]
- Oc Eo
- (from the article "Southeast Asia, history of") ...Chao Phraya, and Irrawaddy river valleys; along the coasts of central Vietnam, western and northern Java, and eastern Borneo; and on the Isthmus of Kra. One of the most intriguing sites, called Oc Eo, is in the Mekong delta region ...
- Ocala
- city, seat (1846) of Marion county, north-central Florida, U.S., about 35 miles (55 km) southeast of Gainesville. It developed around Fort King (established in 1827), an important post during the Seminole Wars. The city's name was derived from Ocali, the ...
- Ocalan, Abdullah
- (from the article "Kurd") ...and encouraged the migration of Kurds to the urbanized western portion of Turkey, thus diluting the concentration of Kurdish population in the uplands. Periodic rebellions occurred, and in 1978 Abdullah Ocalan formed the Kurdistan Workers Party (known by its Kurdish ...
- Ocamo River
- (from the article "Orinoco River") ...to meander through the level plains of the Llanos. The volume of the river increases as it receives numerous mountain tributaries, including the Mavaca River on the left bank and the Manaviche, Ocamo, Padamo, and Cunucunuma rivers on the right.
- Ocampo, Jesus Maria
- (from the article "Armenia") ...to Popayan and is the transfer point for road traffic to Bogota via Ibague (30 miles [50 km] southeast). Armenia (named for the ancient kingdom) was founded in 1889 by Jesus Maria Ocampo and Antonio Herrera. Coffee, corn (maize), beans, ...
- Ocampo, Silvina
- (from the article "Bioy Casares, Adolfo") ..."The Greatest Detective Stories"), a two-volume book of gaucho poetry (Poesia gauchesca, 1955), and other works. Bioy Casares collaborated with his wife, the poet Silvina Ocampo, and Borges to edit Antologia de la literatura fantastica (1940; "Anthology of Fantastic Literature"; ...
- Ocana
- city, Norte de Santander departamento, northern Colombia, in the Hacari valley. Founded (c. 1570) as Nueva Madrid by Francisco Fernandez, the city was renamed for Ocana in New Castile, Spain. An independence convention that was held there in 1828 is ...
- Ocana, Sierra de
- (from the article "Andes Mountains") Farther north the central ranges of the Cordillera Central come to an end, but the flanking chains continue and diverge to the north and northeast. The westernmost of these chains is the Sierra de Ocana, which on its northeastern side ...
- ocarina
- globular flute, a late 19th-century musical development of traditional Italian carnival whistles of earthenware, often bird-shaped and sounding only one or two notes. It is an egg-shaped vessel of clay or metal or, as a toy, of plastic and is ...
- Occasional Conformity Act
- (from the article "United Kingdom") ...and Sacheverell was impeached by only a narrow margin and given a light punishment. When the Tories gained power, they were able to pass legislation directed against Dissenters, including the Occasional Conformity Act (1711), which forbade Dissenters to circumvent the ...
- occasional music
- (from the article "choral music") In addition to sacred and secular works, a very considerable number of compositions, many of them choral, were written for great occasions of state. These include motets and cantatas based on special texts, suitable for performance in a palace, outdoors ...
- occasionalism
- a version of Cartesian metaphysics that flourished in the last half of the 17th century, in which all interaction between mind and body is mediated by God. It is posited that unextended mind and extended body do not interact directly. ... [7 Related Articles]
- Occhetto, Achille
- (from the article "Italy") ...and the loss of anticommunist appeal brought a further decline in the popularity of the Christian Democrats, who won only 29.7 percent of the vote in the 1992 elections. Under its new leader, Achille Occhetto, the Communist Party adopted a ...
- Occhialini, Giuseppi
- (from the article "subatomic particle") ...neutron, and the electron. By the end of 1932, however, Carl Anderson in the United States had discovered the first antiparticle-the positron, or antielectron. Moreover, Patrick Blackett and Giuseppi Occhialini, working, like Chadwick, at the Cavendish Laboratory, had revealed how ...
- Occidental Petroleum Corporation
- major American oil- and gas-producing company. Headquarters are in Los Angeles. [5 Related Articles]
- Occidental, Cordillera
- (from the article "mountain") From northern Argentina to northern Peru and Ecuador, the Andes are much wider, with the widest segment across southern Bolivia. There, the mountain belt consists of two parallel ranges, the Cordillera Occidental (or Western Cordillera) and the Cordillera Oriental (or ...
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