940 résultats pour "known"

• Anatomy.

  The body defends itself against foreign proteins and infectious microorganisms by means of a complex dual system that depends on recognizing a portion of the surfacepattern of the invader. The two parts of the system are termed cellular immunity, in which lymphocytes are the effective agent, and humoral immunity, based on theaction of antibody molecules. When particular lymphocytes recognize a foreign molecular pattern (termed an antigen), they release antibodies in great numbers; other lymphocy...

• Relativity I INTRODUCTION Albert Einstein In 1905 German-born American physicist Albert Einstein published his first paper outlining the theory of relativity.

  in calculating very large distances or very large aggregations of matter. As the quantum theory applies to the very small, so the relativity theory applies to the verylarge. Until 1887 no flaw had appeared in the rapidly developing body of classical physics. In that year, the Michelson-Morley experiment, named after the American physicistAlbert Michelson and the American chemist Edward Williams Morley, was performed. It was an attempt to determine the rate of the motion of the earth through t...

• Montréal - geography.

  percent), and Eastern Orthodox (2.8 percent) religions. Another 5.4 percent claim no religious affiliation. IV EDUCATION AND CULTURE Montréal has a large number of private schools, most of them partially funded by the province. Like the rest of Québec province, Montréal has two public schoolsystems, one for French speakers and one for English speakers. The Charter of the French Language (1977), known as Bill 101, restricts access to English-languageschools and requires children of immigrants t...

• Montréal - Geography.

  percent), and Eastern Orthodox (2.8 percent) religions. Another 5.4 percent claim no religious affiliation. IV EDUCATION AND CULTURE Montréal has a large number of private schools, most of them partially funded by the province. Like the rest of Québec province, Montréal has two public schoolsystems, one for French speakers and one for English speakers. The Charter of the French Language (1977), known as Bill 101, restricts access to English-languageschools and requires children of immigrants t...

• Volcano.

  before eruption. Very violent explosive eruptions are called Plinian eruptions, after Roman naturalist Pliny the Elder. These eruptions can last for several hours to daysand eject a large amount of pyroclastic material. Some volcanoes can produce much more energetic eruptions that eject materials farther from the vents because oftheir andesitic and dacitic composition. Andesitic and dacitic lava is generally thicker than basaltic lava. Stiff lava generally produces more-explosive eruptions. B No...

• United Arab Emirates - country.

  III PEOPLE Most people living in the UAE (known as Emiris) are Arabs, a large majority of whom are city and town dwellers. A small number are nomadic (having no permanent home). The population has grown dramatically since the mid-1960s, largely due to the influx of oil workers to the country. Four-fifths of the UAE’s inhabitants areforeign workers and their families. The UAE also has a very youthful population, due to the large numbers of young foreign workers, a cultural preference for larg...

• Accounting and Bookkeeping.

  The proliferation of mandated notes that accompany financial statements is a particularly visible example. Such notes disclose information that is not already included inthe body of the financial statement. One of the very first notes identifies the accounting methods adopted when acceptable alternative methods also exist, or when theunique nature of the company's business justifies an otherwise unconventional approach. The notes also disclose information about lease commitments, contingent liab...

• Athens (Greece) - geography.

  At the heart of the modern city is Syntagma (Constitution) Square, located east of the Acropolis. The square is bordered by the national Parliament Building, originally aroyal palace completed in 1842 for King Otto I. Nearby is the Tomb of the Unknown Soldier, which features a daily changing of the guard. Several of the city’s principalhotels as well the offices of major banks and airline companies also face the square. Behind the Parliament Building is the National Gardens, a public park that i...

• Fidel Castro.

  result, Castro formed a radical branch of the Ortodoxo Party called the Radical Action Orthodox wing. This organization supported Chibás in the 1948 election. PrioSocarrás won the election, despite Castro’s efforts. After Chibás committed suicide in 1951, Castro believed he should become the leader of the Ortodoxo Party and ran for a seat in the Cuban House of Representatives inthe 1952 election. Before that election could occur, however, General Fulgencio Batista staged a bloodless coup d’etat...

• Mexican Revolution.

  growing economic and social difficulties. Although Madero called for free and democratic elections, and a ban on reelection at all levels of government, he offered little tourban workers seeking higher wages and better working conditions, or to indigenous people seeking the restoration of their traditional lands. Madero’s intention was tolead a political rebellion, not a social revolution. Despite the political nature of the plan, it became a rallying point for poor and working-class Mexicans, m...

• Lithuania - country.

  pollution. III PEOPLE Ethnic Lithuanians constitute about 80 percent of the country’s population. The proportion of Lithuanians increased slightly in the first years after the dissolution of theSoviet Union—many Lithuanians returned to their homeland from that country and abroad while some Russians, Ukrainians, and Belarusians left the country. Russiansand Poles constitute the country’s largest minority groups, each accounting for roughly 7 percent of the population. Jews were the largest mino...

• Earthquake.

  III CAUSES Most earthquakes are caused by the sudden slip along geologic faults. The faults slip because of movement of the Earth’s tectonic plates. This concept is called theelastic rebound theory. The rocky tectonic plates move very slowly, floating on top of a weaker rocky layer. As the plates collide with each other or slide past eachother, pressure builds up within the rocky crust. Earthquakes occur when pressure within the crust increases slowly over hundreds of years and finally exceeds...

• Yemen - country.

  port. Al Ḩudaydah (155,110), in the Tih āmah, is the second largest port. Ta‘izz, (178,043), in the highlands above Aden, is an important commercial and light industrialcenter. Among Yemen’s larger towns are Şa‘dah, far to the north; Dham ār, Yarim, and Ibb, in the middle region; Al Mukall ā, on the southern coast; and in Hadhramaut,the towns of Shib ām, Say‘ ūn, and Tar īm. C Language Nearly all Yemenis speak Arabic. However, the country’s extremely rugged terrain, widely separated population...

• Andrew Jackson.

  against a resolution praising President George Washington’s administration. Jackson claimed that Washington’s policy toward Native Americans was too lenient and thatJay’s Treaty, concluded with the British under Washington’s administration, was too damaging to American interests. After one year in the House, Jackson was elected to fill out an unexpired term in the U.S. Senate, the other chamber of the Congress of the United States. He servedfrom September 1797 to April 1798 and then retired to p...

• Andrew Jackson

  against a resolution praising President George Washington’s administration. Jackson claimed that Washington’s policy toward Native Americans was too lenient and thatJay’s Treaty, concluded with the British under Washington’s administration, was too damaging to American interests. After one year in the House, Jackson was elected to fill out an unexpired term in the U.S. Senate, the other chamber of the Congress of the United States. He servedfrom September 1797 to April 1798 and then retired to p...

• Andrew Jackson - USA History.

  against a resolution praising President George Washington’s administration. Jackson claimed that Washington’s policy toward Native Americans was too lenient and thatJay’s Treaty, concluded with the British under Washington’s administration, was too damaging to American interests. After one year in the House, Jackson was elected to fill out an unexpired term in the U.S. Senate, the other chamber of the Congress of the United States. He servedfrom September 1797 to April 1798 and then retired to p...

• Brahman

• Sodium - chemistry.

• Ecosystem.

  Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.

• Byzantine philosophy

  important and most prolific of the Byzantine polymaths, Ioannes Italos, Theodoros of Smyrna, Eustratios of Nicaea and Michael of Ephesos. The last two are better known as commentators on Aristotle. The general outlook of the pre-eminent philosophers of this period, and the particular tendencies in their work, display the basic characteristics of Byzantine philosophy but with some distinctive features, such as an even stronger leaning towards the classical models of Greek philosophy and attempts...

• Minneapolis - geography.

  into a ten-block shopping center, known as Nicollet Mall, reserved for pedestrians and public transportation; at one end is Gateway Center, a complex that includes severalhigh-rise government and office buildings. Pedestrians may also cross from building to building using skyways, glass-enclosed bridges that cross many downtown streets.The Mall of America, the largest retail and entertainment complex in the United States, is in nearby Bloomington. V EDUCATIONAL AND CULTURAL INSTITUTIONS Weisman...

• Las Vegas (Nevada) - geography.

  Las Vegas CasinoCasinos are gambling establishments that range from small rooms in bars or restaurants to huge resorts—such as this one in LasVegas, Nevada—filled with slot machines and other games. Gambling was legalized in Nevada in 1931 and has grown into amultibillion-dollar industry, helping make the state one of the fastest-growing in the nation.Jeff Greenberg/age fotostock Las Vegas bills itself as the “Entertainment Capital of the World,” and tourism, gaming, and entertainment represent...

• Encyclopedia of Philosophy: AL-R-Z/ AND AL-F-R-B/

  cultural particularities. Political philosophy includes consideration of the relations between philosophy and religion,which for al-F&r&b( meant the defence of philosophy. A number of his works fit into this class. The Enumeration ofthe Sciences surveys the encyclopaedia of scientific knowledge which the Arabs have built up through theirphilology, their translations from the Greek and their own creative work: grammar and linguistics, logic, mathematics(in the broad sense of the quadrivium...

• Anselm of Canterbury

  twenty-six years old. After his father's death (presumably in 1060), Anselm chose to enter the monastic order atBec rather than return to the family estate. In 1063 he was elected prior of Bec, succeeding Lanfranc, who hadbeen called to the abbey of St.-Etienne in Caen; in 1078 he was chosen abbot, in spite of his disinclination toassume the office. He showed even more reluctance and protestation when selected as archbishop of Canterbury in1093, again in succession to Lanfranc. Eadmer tells...

• Golf. I INTRODUCTION Golf, outdoor game in which individual players use specially designed

  caddie or caddy. (Caddies, once an integral feature of the game, have now been replaced on many courses by motorized carts and pull carts.) In England the game was made popular by the attention given it by James VI of Scotland, later James I of England, and his son Charles I. In the 18th century the first golf associations were established. They included the Honourable Company of Edinburgh Golfers (founded 1744) in Edinburgh, Scotland;the Saint Andrews Society of Golfers (1754) in Saint Andrew...

• San Diego - geography.

  Also in the city is the Salk Institute for Biological Studies, founded by Jonas Salk, the developer of a vaccine for polio, to conduct basic science research on human health. The cultural heart of San Diego is Balboa Park. Located there are the San Diego Museum of Art, with a permanent collection of works from the Italian Renaissance, and theSan Diego Natural History Museum, emphasizing the American Southwest. The San Diego Museum of Man explores the origins of humans, while the Reuben H. Fleet...

• Dallas (Texas) - geography.

  College of Dentistry (1905); Baylor School of Nursing (1909); Dallas Baptist University (1965); Dallas Christian College (1950); Dallas Theological Seminary (1924); andseveral campuses of Dallas County Community College (1965). Located in the surrounding metropolitan area are more than a dozen other universities and colleges,including the University of Texas at Dallas (1969), in Richardson, the University of Dallas (1956), in Irving, and the University of North Texas (1890), in Denton. Dallas is...

• Spinal Column.

• Art Nouveau I INTRODUCTION Detail of Art Nouveau Decoration This detail of a door decoration from a building constructed in the early 20th century in Milan, Italy, illustrates the stylistic themes associated with art nouveau.

  Wallpaper by William MorrisIn the early 19th century manufacturers began to mass-produce wallpaper, and the quality of designs suffered. WilliamMorris, a British artist who had become interested in the design of household furnishings and items for everyday use,began to create handmade wallpapers that he integrated into the overall design of the home. This artichoke design isbased on stylized plant motifs, a common theme in art nouveau designs.Art Resource, NY Art nouveau in Britain evolved out o...

• Seed - biology.

• Lima (Peru) - geography.

  Market in Lima, PeruShoppers and workers mingle in an outdoor market in Lima, Peru.M. Mcintyre/Hutchison Library On the city’s margins, however, vast squatter settlements have mushroomed, as large numbers of rural Peruvians have migrated to the city seeking a better life. More thanone-third of Lima’s population is estimated to live in such settlements, known as pueblos jovenes (young towns) or barriadas (shantytowns). Often these squatter settlements have developed relatively close to wealth...

• DiMaggio Wins Batting Title.

  In game four DiMaggio took part in one of the most bizarre plays in World Series history. Down two runs in the top of the ninth, the Yankees tied the score at fourapiece to take the game into extra innings. DiMaggio came up in the top of the tenth with two men on base and a chance to bring home the go-ahead run. He rapped asingle to right field, scoring one run. When Reds outfielder Ival Goodman misplayed the ball, Keller, a burly rookie known as King Kong, raced home and slammedinto catcher Ern...

• GALILEO

  marvels , known as a perspicillium, had already been demonstrated in Milan.” 6) When, Galileo turned his telescope to the Milky Way (after observing the Moon), it was transformed from a diaphanous haze to a vast rash of stars. And he observed the Sun, and found that it had black spots “which appeared to consume themselves”. These not only dissolved, but appeared seemingly at random, taking on all kinds of shapes like clouds. Any of the relativ...

• AcheLousLAbyrinth

  d’abord, puis les relations professionnelles et amicales partagées tout au long de cette année passée ensemble. • Sommaire [pic] [pic] Introduction générale L’entreprise, dés lors que son activité augmente, nécessite le recours à des salariés. Cette situation justifie la mise en place d’une gestion sociale, dans toute structure économique. Bien évidemment, le développement de cette structuration sociale va passer par des seuils qu’ils soient historiques ou liés à la taille de l’entrep...

• Dinosaurs.

  protected their necks. Ankylosaurus was about 33 feet (10 meters) long. ORNITHOPODS Ornithopods were once the most numerous plant-eating dinosaurs. There were many different kinds.Over time, ornithopods developed broad beaks. These later ornithopods are called duck-billed dinosaurs.Some ornithopods were small and ran fast. Others were huge. Iquanodon, for example, was 25 feet (7.5 meters) long. PACHYCEPHALOSAURS These dinosaurs walked on two feet. They had thick, dome-shaped skulls. Scienti...

• sAbines AcheLou

  artificialisation des sols ; prédominance champs, prairie et bois ; habitat fondé sur village, hameaux, lotissement) accueillant une foret proportion d'hbts étroitement lié à la ville voisine car y travaillant, y faisant leur course, études… Périurbain : analysé comme une extension de la ville, ou comme un espace d'un nouveau type dépassant l'opposition traditionnelle entre villes et campagnes. Facteur expliquant arrivée de pop dans ces espaces : -économique : faibles coût du fonci...

• english history

  He was a Scottish moral philosopher and a pioneer of political economics. Smith studied social philosophy at the University of Glasgow and the University of Oxford. Smith obtained a professorship at Glasgow teaching moral philosophy. Smith returned home and spent the ten years writing The Wealth of Nations , publishing it in 1776. He became famous for this book, which had a profound influence on modern economics and concepts of individual free...

• HISTOIRE DE KEYNE BRITISH

  He was a Scottish moral philosopher and a pioneer of political economics. Smith studied social philosophy at the University of Glasgow and the University of Oxford. Smith obtained a professorship at Glasgow teaching moral philosophy. Smith returned home and spent the ten years writing The Wealth of Nations , publishing it in 1776. He became famous for this book, which had a profound influence on modern economics and concepts of individual free...

• echidnA

  Mardonios, commandant l’armée perse, envahit de nouveau l’Attique et incendie Athènes, les Spartiates retardent le plus possible leur intervention, dans l’espoir de terminer un mur qui barre l’isthme péloponnésien. Puis, ils envoient finalement une armée qui combat au côté des alliés dans la bataille victorieuse de Platée. Dès 478, les Spartiates se retirent de la coalition et se recentrent sur les affaires strictement péloponnésienne, poussés par les alliés qui se plaignent de la cond...

• Meteor Shower - astronomy.

  Meteor observations with radar work much the same way that observations with radio forward scattering observations do. With radar, the receiver and transmitter areat the same place. Both methods provide numbers of meteors per hour, without the visual observer’s dependence on a clear, dark sky. Astronomers can determine the orbit of the particle stream that creates a meteor shower by finding out the radiant of the shower and the speed of the meteors.Observers must record meteors with cameras or v...

• Argentina - country.

  Patagonia lies in the rain shadow of the Andes and so receives little moisture. As a result it is used primarily for grazing sheep, although some crops are grown on smallfarms in irrigated valleys. Several major oil fields also are in Patagonia. At the southern tip of Patagonia is Tierra del Fuego, a large mountainous island shared byArgentina and Chile. B Rivers and Lakes Most of Argentina’s rivers empty into the Atlantic Ocean. Three rivers—the Paraná, Paraguay, and Uruguay—flow generally sou...

• Han Dynasty - history.

  of merit rather than birth. Written examinations were adopted as a means of determining the best qualified people, although use of the examinations in actually makingappointments was limited. A school was established at the capital for training government officials. The administrative bureaucracy was systematized, and a career civilservice was created and extended through much of the empire. Although personally interested in the magical side of Daoism, Wudi made a descendent of Confucius the sup...

• Han Dynasty - history.

  of merit rather than birth. Written examinations were adopted as a means of determining the best qualified people, although use of the examinations in actually makingappointments was limited. A school was established at the capital for training government officials. The administrative bureaucracy was systematized, and a career civilservice was created and extended through much of the empire. Although personally interested in the magical side of Daoism, Wudi made a descendent of Confucius the sup...

• Montréal - geography.

  Place Jacques-Cartier, MontréalPlace Jacques-Cartier is named for the French explorer who was one of the first Europeans to venture into Canada in the 16thcentury. It is a popular spot in the city of Montréal, Québec’s largest city.R.E. Murowchick/Photo Researchers, Inc. French influence lasted for a time after the British conquest of 1760, as shown by some late 18th-century houses. British influence came to prevail, however, and most ofOld Montréal is in fact a Victorian Style city, probably th...

• Inca Empire - history.

  rediscovered the site in 1911.© Microsoft Corporation. All Rights Reserved. Inca society was strictly organized, from the emperor and royal family down to the peasants. The emperor was thought to be descended from the sun god, Inti, and hetherefore ruled with divine authority. All power rested in his hands. Only the influence of custom and the fear of revolt checked the emperor’s power. The emperor had oneofficial wife, but he had many royal concubines and his children by these wives often numbe...

• Insect - biology.

  they almost always have six legs. In some insects, such as beetles, the legs are practically identical, but in other insects each pair is a slightly different shape. Still otherinsects have specialized leg structures. Examples are praying mantises, which have grasping and stabbing forelegs armed with lethal spines, and grasshoppers andfleas, which have large, muscular hind legs that catapult them into the air. Mole crickets’ front legs are modified for digging, and backswimmers have hind legs de...

• Zoology - biology.

  is still in its infancy and is quite controversial, chiefly because it has raised anew the old dispute about whether behavior is genetically determined. See Animal Behavior; Sociobiology. Embryology, the study of the development of individual animals, has investigated the way in which developing parts interact—for example, the interactions between theeyestalk and the epidermis during development of the lens of the eye. The emerging field of molecular development applies the techniques of molecu...

• Rock (mineral).

  pressure mineral assemblage. In a sense, the rock is stuck in a state that is characteristic of its earlier high-temperature and high-pressure environment. Thus,metamorphic rocks carry with them information about the history of temperatures and pressures to which they were subjected. The size, shape, and distribution of mineral grains in a rock are called the texture of the rock. Many metamorphic rocks are named for their main texture. Textures giveimportant clues as to how the rock formed. As t...

• Native American Art.

  folding, braiding or weaving, could also be sewn onto the hide. The production of decorated clothing and bags increased after contact with Europeans as a greater variety of textiles and other materials became available throughtrade. Imported glass beads inspired native women, who quickly adapted quillwork techniques for the creation of beaded apparel. European curvilinear and floraldesigns of the 19th century proved as meaningful for the native women who worked with them as they were for the non...

• Wrestling.

  (4) Escapes are scored when a wrestler, controlled by the opponent on the mat, frees himself or herself and moves to a standing position, facing the opponent. Common escapes include the standup and the sitout. V HISTORY Wrestling has been popular throughout recorded history. Origins of the sport can be traced back 15,000 years through depictions in cave drawings in France. EarlyEgyptian and Babylonian reliefs depict wrestlers using most of the holds known to the present-day sport. In ancient G...