(from the article "lamp shells") ...in outline; shell either contains phosphate or is punctate calcareous; pedicle opening confined to the ventral valve; 62 genera; Early Cambrian to Recent.Mostly calcareous, biconvex, shape nearly circular to ...
genus of extinct brachiopod, or lamp shell, of the Cambrian Period (from 542 million to 488 million years ago). Obolus was a small animal with a spherical shape; one valve, ...
politician who was prime minister (1962-70) and twice president (1966-71, 1980-85) of Uganda. He led his country to independence in 1962, but his two terms in office (both of which ... [6 Related Articles]
(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 ...
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]
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]
(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 ...
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]
(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 ...
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 ... [4 Related Articles]
(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 ...
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 ... [1 Related Articles]
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 ... [4 Related Articles]
(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 ...
(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 ...
(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 ...
(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 ...
(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 ...
(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 ...
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 ... [1 Related Articles]
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 ... [6 Related Articles]
(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 ...
(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 (
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, ... [9 Related Articles]
(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 ...
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]
(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 ...
(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 ...
(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; ...
(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 ...
(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 ...
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 ...
(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 ...
(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 ...
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 ... [2 Related Articles]
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 ... [2 Related Articles]
(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 ...
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 ...
(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 ...
(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 ...
(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 ...
(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 ...
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. ...
(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 ...
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 ...
(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 ...
(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 ...
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 ... [7 Related Articles]
(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 ...
(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, ...
(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 ...
(from the article "Andes Mountains") North of the Pasco Knot, three different ranges run along the plateau: the Cordilleras Occidental, Central, and Oriental. In the Cordillera Occidental, at latitude 10° S, the deep, narrow Huaylas ...
(from the article "Andes Mountains") ...of parallel and transverse mountain ranges, or cordilleras, and of intervening plateaus and depressions. Distinct eastern and western ranges-respectively named the Cordillera Oriental and the Cordillera Occidental-are characteristic of most ...
(from the article "Andes Mountains") ...system consists of a long, narrow plateau running from south to north bordered by two mountain chains containing numerous high volcanoes. To the west, in the geologically recent and relatively ...
bone forming the back and back part of the base of the cranium, the part of the skull that encloses the brain. It has a large oval opening, the foramen ... [3 Related Articles]
(from the article "eye, human") ...and birds, vision is barely affected, so that a pigeon that has been subjected to the operation can fly and avoid obstacles as well as a normal one. In rodents, ...
a Romance language spoken by about 1,500,000 people in southern France. All Occitan speakers use French as their official and cultural language, but Occitan dialects are used for everyday purposes ... [9 Related Articles]
(from the article "Occitan language") ...use French as their official and cultural language, but Occitan dialects are used for everyday purposes and show no signs of extinction. The name Occitan is derived from the geographical ...
(from the article "extratropical cyclone") ...Hemisphere, on the western side of such a cyclone sweeps under all of the warm tropical air of the system so that the entire cyclone is composed of the cold ...
(from the article "burn") Occlusive dressings, usually combined with topical antibacterial agents, are more commonly used in the treatment of extensive burns. The antibacterial ointment or cream may be applied to the patient or ...
(from the article "nervous system disease") Occlusive strokes, those in which a blood vessel supplying a part of the brain is blocked, are divided into four groups: (1) Transient ischemic attacks (TIAs) are the mildest occlusive ...
complete obscuration of the light of an astronomical body, most commonly a star, by another astronomical body, such as a planet or a satellite. Hence, a total solar eclipse is ... [5 Related Articles]
(from the article "lighthouse") ...a long eclipse of several seconds between successive groups. The whole pattern is repeated at regular intervals of 10 or 20 seconds. These are known as group-flashing lights. In another ...
various theories and practices involving a belief in and knowledge or use of supernatural forces or beings. Such beliefs and practices-principally magical or divinatory-have occurred in all human societies throughout ... [7 Related Articles]
(from the article "property") Throughout the West, property may be acquired by various "original modes" of acquisition. For instance, "occupancy" is a means of original acquisition when the thing possessed belonged to no one ...
(from the article "Roman law") In terms of occupatio, ownerless things that were susceptible to private ownership (excluding such things as temples) became the property of the first person to take possession of them. This ...
(from the article "war, law of") World War II illustrated that civilians in occupied territory were largely unprotected by the laws of war. In consequence, the fourth Geneva Convention of 1949 provided detailed rules for their ...
any illness associated with a particular occupation or industry. Such diseases result from a variety of biological, chemical, physical, and psychological factors that are present in the work environment or ... [5 Related Articles]
(from the article "Malthus, Thomas Robert") ...might have been a few more instances of severe distress, the aggregate mass of happiness among the common people would have been much greater than it is at present." These ...
(from the article "Daily maximum noise exposure permitted by the U.S. Occupational Safety and Health Act of 1970") ...for automating an industrial operation. Automated systems often remove workers from the workplace, thus safeguarding them against the hazards of the factory environment. In the United States the Occupational Safety ...
(from the article "Nixon, Richard M.") ...Opportunity Commission (EEOC), was substantially increased while Nixon was in office. In response to pressure from consumer and environmental groups, Nixon proposed legislation that created the Occupational Safety and Health ...
(from the article "Germany") Initially, West Germany was not a sovereign state. Its powers were circumscribed by an Occupation Statute drawn up by the American, British, and French governments in 1949. That document reserved ...
(from the article "sociology") ...research in social stratification was influenced by the attainment model of stratification, initiated at the University of Wisconsin by William H. Sewell. Designed to measure how individuals attain occupational status, ...
use of self-care and work and play activities to promote and maintain health, prevent disability, increase independent function, and enhance development. This form of therapy evolved from the recognition that ... [1 Related Articles]
(from the article "epistemology") A distinction closely related to the previous one is that between "occurrent" and "dispositional" knowledge. Occurrent knowledge is knowledge of which one is currently aware. If one is working on ...
county, east-central New Jersey, U.S., bounded by the Metedeconk River to the north, the Manasquan River to the northeast, and the Atlantic Ocean to the east. It comprises a coastal ...
(from the article "undersea exploration") Other acoustic techniques can be utilized to study ocean variables on a large scale. A method known as ocean acoustic tomography, for example, monitors the travel time of sound pulses ...
(from the article "ocean") The first major undersea survey was undertaken during the 1870s, but it was not until the last half of the 20th century that scientists began to learn what lies beneath ...
resort town, Worcester county, southeastern Maryland, U.S. Ocean City lies along a 10-mile (16-km) barrier beach between a chain of bays (Sinepuxent, Isle of Wight, and Assawoman) and the Atlantic ... [1 Related Articles]
resort, city, Cape May county, southeastern New Jersey, U.S., on a barrier island between Great Egg Harbor (bridged to Somers Point and Longport) and the Atlantic Ocean, 12 miles (19 ...
horizontal and vertical circulation system of ocean waters produced by gravity, wind friction, and water density variation in different parts of the ocean. [19 Related Articles]
(from the article "Antarctica") Internationally funded drilling operations began in 1985 with the Ocean Drilling Program, using the new drilling vessel JOIDES Resolution to expand earlier Glomar Challenger studies. Studies in the Weddell Sea ...
(from the article "undersea exploration") The ocean floor has the same general character as the land areas of the world: mountains, plains, channels, canyons, exposed rocks, and sediment-covered areas. The lack of weathering and erosion ...
one of the two principal types of merchant ship as classified by operating method; the other is the tramp steamer. A liner operates on a regular schedule of designated ports, ... [3 Related Articles]
(from the article "insurance") Ocean marine contracts are written to cover four major types of property interest: (1) the vessel or hull, (2) the cargo, (3) the freight revenue to be received by the ...
(from the article "yacht") Ocean racing began in 1866 with a match race held under NYYC rules from Sandy Hook, Conn., to Cowes, Isle of Wight, Eng., by three schooners of 32- to 32.6-metre ...
(from the article "ocean ranching") the rearing of fish and shellfish under artificially controlled conditions to restock the sea. See aquaculture.aquacultureaquacultureOcean ranching by governments is ...
resort city, Jackson county, southeastern Mississippi, U.S., on Biloxi Bay across from Biloxi. It developed around the site of Old Biloxi, where the explorer Pierre Le Moyne d'Iberville established Fort ...
(from the article "ocean") Another more promising technology, known as ocean thermal energy conversion (OTEC), makes use of the temperature differential between the warm surface waters of the oceans, heated by solar radiation, and ...
(from the article "The Deadliest Tsunami") ...of 9.0 struck off the coast of the Indonesian island of Sumatra. (See Earth Sciences: Geophysics.) Over the next seven hours, a tsunami-a series of immense ocean ...
(from the article "climate") The circulation of the ocean is a key factor in air temperature distribution. Ocean currents that have a northward or southward component, such as the warm Gulf Stream in the ...
saltwater aquarium for displaying marine animals and plants, particularly oceanic, or pelagic, fishes and mammals. It serves as a centre for public entertainment and education and scientific study. Most oceanariums ... [1 Related Articles]
(from the article "Shedd Aquarium") ...(340,000 litres) of seawater nearly every hour and contains a wide variety of marine animals, including nurse sharks, sea turtles, moray eels, and numerous rare and colourful varieties of fish. ...
collective name for the islands scattered throughout most of the Pacific Ocean. The term, in its widest sense, embraces the entire insular region between Asia and the Americas. A more ... [5 Related Articles]
(from the article "art and architecture, Oceanic") the visual art and architecture of native Oceania, including media such as sculpture, pottery, rock art, basketry, masks, painting, and personal decoration. In these cultures, art and architecture have often ...
(from the article "France") The pure oceanic climate prevails in the northwest, especially in Brittany. It is characterized by its low annual temperature variation, with Brest having an average temperature in January of 43 ...
(from the article "Earth Sciences") In 2006 an international team of scientists in the Integrated Ocean Drilling Program announced that they had reached a milestone in the scientific drilling of the oceanic crust. Nearly four ...
