181 résultats pour "caused"

• First Aid.

  IV SEVERE BLEEDING The presence of blood over a considerable area of a person’s body does not always indicate severe bleeding. The blood may ooze from multiple small wounds or besmeared, giving the appearance of more blood than is actually present. The rate at which blood is lost from a wound depends on the size and kind of blood vesselruptured. Bright red, spurting blood indicates injury to an artery while welling or steadily flowing, dark red blood indicates injury to a vein. Welling or spur...

• Asteroid - astronomy.

  Asteroids of the S type, related to the stony iron meteorites, make up about 15 percent of the total population of asteroids that can be seen from Earth. Much rarer arethe M-type objects, corresponding in composition to the meteorites known as “irons.” These objects are made up of an iron-nickel alloy and may represent the cores ofbodies that were large enough to differentiate into layers and to melt deep inside. Their rocky outer layers may have been removed by impacts with other asteroids . A...

• Great Depression in the United States - U.

  prices would continue to rise and they could soon sell their stocks at a profit. The widespread belief that anyone could get rich led many less affluent Americans into the market as well. Investors bought millions of shares of stock “on margin,” arisky practice similar to buying products on credit. They paid only a small part of the price and borrowed the rest, gambling that they could sell the stock at a highenough price to repay the loan and make a profit. For a time this was true: In 1928 the...

• Technology.

  loose soil in this region, known as the Fertile Crescent, was easily scratched for planting, and an abundance of trees was available for firewood. By 5000 BC, farming communities were established in areas known today as Syria, Turkey, Lebanon, Israel, Jordan, Greece, and the islands of Crete and Cyprus. Agricultural societies in these places constructed stone buildings, used the sickle to harvest grain, developed a primitive plowstick, and advanced their skills inmetalworking. Trade in flint al...

• Pornography.

  censorship. Congress passed 20 obscenity laws between 1842 and 1956, most of which were variations of or amendments to the original Comstock Law. Later, Congress passed aseries of antipornography and anti-indecency laws dealing with new forms of technology and with the protection of children. The Protection of Children Against SexualExploitation Act of 1977 prohibits anyone from employing or inducing a minor to participate in sexual conduct or in the making of pornography. In 1988 Congresspassed...

• Labor Unions in the United States - U.

  National Guard troops were used against the strikers, with the result that the strike was lost and the union that conducted it virtually destroyed. In 1894 a strike by theAmerican Railway Union against the Pullman Palace Car Company was defeated by an injunction issued under the Sherman Antitrust Act of 1890, which made acombination or contract in restraint of trade illegal. Thereafter employers used injunctions with increasing frequency and effectiveness as an antistrike weapon. See also Hours...

• Whale - biology.

  III BEHAVIOR OF WHALES Studies of whales in captivity have taught scientists much about the complex social behavior of whales. Since the late 1980s, advances in the use of satellite trackingsystems have also broadened opportunities for scientists to observe how whales behave in the wild. A Swimming and Diving Whales swim by making powerful up-and-down movements of the tail flukes, which provide thrust. The power comes from body muscles that flex the lower spine upand down in a wavelike motion...

• Bulgaria - country.

  E Climate Most of Bulgaria has a continental climate, with cold winters and hot summers. The climate in general is more severe than in other European areas of the samelatitudes, and the average annual temperature range is greater than that of neighboring countries. Severe droughts, frosts, winds, and hail storms frequently damagecrops. A Mediterranean climate, with dry summers and mild, humid winters, prevails in the valley of the southwestern Rhodope Mountains; the northern limit of theclimati...

• George Washington I INTRODUCTION George Washington (1732-1799), first president of the United States (1789-1797) and one of the most important leaders in United States history.

  A2 Promotion This was Washington’s first experience with the difficulties of raising troops while lacking equipment, clothing, and funds. Apparently he thought his efforts worthy ofsome recognition and successfully applied to Dinwiddie for a lieutenant colonel’s commission. He left Alexandria, Virginia, early in April with about 150 poorly equippedand half-trained troops. A3 First Battles Before he had advanced very far, Washington received news that the French had driven Trent’s men back from...

• George Washington.

  A2 Promotion This was Washington’s first experience with the difficulties of raising troops while lacking equipment, clothing, and funds. Apparently he thought his efforts worthy ofsome recognition and successfully applied to Dinwiddie for a lieutenant colonel’s commission. He left Alexandria, Virginia, early in April with about 150 poorly equippedand half-trained troops. A3 First Battles Before he had advanced very far, Washington received news that the French had driven Trent’s men back from...

• George Washington

  A2 Promotion This was Washington’s first experience with the difficulties of raising troops while lacking equipment, clothing, and funds. Apparently he thought his efforts worthy ofsome recognition and successfully applied to Dinwiddie for a lieutenant colonel’s commission. He left Alexandria, Virginia, early in April with about 150 poorly equippedand half-trained troops. A3 First Battles Before he had advanced very far, Washington received news that the French had driven Trent’s men back from...

• Ohio - geography.

  conflict with modified Gulf air and causing frontal or cyclonic storms. Gulf air is dominant in summer. In fall, polar air passing over Lake Erie is modified, delaying thekilling frost along the adjacent shoreline. C1 Temperatures The mean annual temperatures for the state range from 9° C (48° F) in the northeast to 13° C (55° F) in the south. Average January temperatures range from -4° C(24° F) in the west to 2° C (35° F) in the south. July averages are 24° C (76° F) in the south and 23° C (73...

• Ohio - USA History.

  conflict with modified Gulf air and causing frontal or cyclonic storms. Gulf air is dominant in summer. In fall, polar air passing over Lake Erie is modified, delaying thekilling frost along the adjacent shoreline. C1 Temperatures The mean annual temperatures for the state range from 9° C (48° F) in the northeast to 13° C (55° F) in the south. Average January temperatures range from -4° C(24° F) in the west to 2° C (35° F) in the south. July averages are 24° C (76° F) in the south and 23° C (73...

• Kansas - geography.

  at the adjoining cities of Kansas City, Kansas, and Kansas City, Missouri. Its chief headstreams are the Republican and Smoky Hill rivers, which join to form the KansasRiver at Junction City. Each of the headstreams has numerous tributaries. The Kansas River proper is only 270 km (170 mi) long, but the Smoky Hill River has a lengthof 870 km (540 mi), and the Republican River has a length of 720 km (450 mi). The main tributary flowing into the Kansas River is the Big Blue River. The Arkansas Rive...

• Kansas - USA History.

  at the adjoining cities of Kansas City, Kansas, and Kansas City, Missouri. Its chief headstreams are the Republican and Smoky Hill rivers, which join to form the KansasRiver at Junction City. Each of the headstreams has numerous tributaries. The Kansas River proper is only 270 km (170 mi) long, but the Smoky Hill River has a lengthof 870 km (540 mi), and the Republican River has a length of 720 km (450 mi). The main tributary flowing into the Kansas River is the Big Blue River. The Arkansas Rive...

• Afghanistan - country.

  D Climate Most of Afghanistan has a subarctic mountain climate with dry and cold winters, except for the lowlands, which have arid and semiarid climates. In the mountains and afew of the valleys bordering Pakistan, a fringe effect of the Indian monsoon, coming usually from the southeast, brings moist maritime tropical air in summer.Afghanistan has clearly defined seasons: Summers are hot and winters can be bitterly cold. Summer temperatures as high as 49°C (120°F) have been recorded in thenorth...

• American Revolution.

  C1 The South Southern agriculture was founded on the cultivation of tobacco, wheat, and corn in Virginia, Maryland, and North Carolina, and of rice and indigo (a blue dye) in SouthCarolina and Georgia. There was a large demand for these crops in Europe. These crops were cultivated with the help of black slaves imported from Africa. The whiteplanter class in the South was the most powerful, both politically and economically. C2 The North Wheat was the main cash crop of the mid-Atlantic colonies...

• American Revolution - U.

  C1 The South Southern agriculture was founded on the cultivation of tobacco, wheat, and corn in Virginia, Maryland, and North Carolina, and of rice and indigo (a blue dye) in SouthCarolina and Georgia. There was a large demand for these crops in Europe. These crops were cultivated with the help of black slaves imported from Africa. The whiteplanter class in the South was the most powerful, both politically and economically. C2 The North Wheat was the main cash crop of the mid-Atlantic colonies...

• Famine in Ireland

  In 1848, facing this poverty, Irish persons saw in America a good solution to avoid the famine. Further to the number of dead persons, thousands of Irish persons left their native country to go in America by cargo ship. Several persons died because of the storm and the diseases. Ireland's population decreased by more than 2 million people (8,5 to 6,5). For Irish persons, United States gave a real dream to begin a new life: the famous American dream. It gave them the opportunity to have a new lif...

• Hercules (mythology) I INTRODUCTION Pollaiuolo's Hercules et Antaeus In a wrestling match, Hercules triumphed over the mighty giant Antaeus, who received his strength from his mother, the Earth goddess Gaia.

  Pollaiuolo’s Hercules and the HydraAmong his 12 labors, the mythological hero Hercules had to kill the nine-headed Hydra. Each time Hercules cut off onehead, two more grew in its place. Hercules solved the problem by, as soon as he cut off one head, burning with a torchthe spot where it had been to stop its regrowth. Hercules and the Hydra (about 1460, Uffizi, Florence, Italy) was paintedby Italian artist Antonio Pollaiuolo. Hercules is shown wearing the skin of the Nemean lion, which he had kil...

• Macroeconomics.

  IV INFLATION For several decades after World War II (1939-1945) the main inflation theories were demand-pull and cost-push. The cost-push theory basically emphasized the role ofexcessive increases in wages relative to productivity increases as a cause of inflation, whereas the demand-pull theory tended to attribute inflation more to excessdemand in the goods market caused by expansion of the money supply. A central concept in inflationary theory since the mid-1950s has been the Phillips curve...

• Nova - astronomy.

  When first discovered, the spectrum of a nova shows that the expanding layers of gas that cause the brightening have temperatures of 40,000° to 50,000° C (70,000°to 90,000° F)—about eight times as hot as the surface of the Sun. By the time a nova reaches maximum brightness, the temperature of the material has fallen to about10,000° C (about 20,000° F), or lower. Just after maximum brightness, the escaping cloud of gas cools and expands enough to become transparent. This transparency allows astro...

• Steam Engine.

  wear caused by this pressure, steam-engine valves are frequently made in a cylindrical form entirely enclosing the piston, so that the pressure is equal all around thevalve and friction is minimized. The development of this type of valve is attributed to the American inventor and manufacturer George Henry Corliss. In other types ofslide valves, the moving portion of the valve is designed so that steam does not press directly on the back of the valve. The linkage between the piston of the engine...

• Galaxy - astronomy.

  Astronomers have obtained images of young galaxies using the Keck Telescope in Hawaii and the Hubble Space Telescope, which resides in an orbit high above Earth’satmosphere and thus avoids atmospheric interference. Photos from the HST show galaxies that are as far as 13 billion light-years away from Earth, which means theyformed soon after the universe formed about 13.7 billion years ago. The galaxies appear to be spherical in shape, and may be early precursors of elliptical and spiralgalaxies....

• Dark Matter - astronomy.

  observed, and the measured frequency of such events has placed limits on how much dark matter can take the form of MACHOs. From the observations that have beenmade by astronomers, it is now known that MACHOs cannot be the dominant constituent of dark matter. There are simply not enough such gravitational lenses. Physicists suspect that a more exotic form of cold dark matter must exist. This form is not baryonic. Like neutrinos, this form barely interacts with ordinary matter, butis some type of...

• Ice Ages.

  B Future Ice Ages The record of previous glacial activity is the best indicator for future ice ages. Scientists examine the evidence for the numerous 100,000-year glacial-interglacial cycleswithin the present ice age to attempt a forecast of future ice ages. Since all previous ice ages lasted tens of millions of years, our present ice age will likely continue fora considerable amount of time. Each glaciation begins slowly and may take 80,000 years or more to reach its maximum extent. A rapid me...

• Napoleonic Wars .

  Before the effect of British sea power could be manifest, however, Napoleon increased his power over the Continent. In 1806 Prussia, aroused by Napoleon's growingstrength in Germany, joined in a Fourth Coalition with Britain, Russia, and Sweden. Napoleon badly defeated the Prussians in the Battle of Jena on October 14, 1806,and captured Berlin. He then defeated the Russians in the Battle of Friedland and forced Alexander I to make peace. By the principal terms of the Treaty of Tilsit, Russiagave...

• Black Death.

  disappeared in the West. V DISAPPEARANCE OF PLAGUE Plague became less common in Europe after the 1530s. The last plague in England was in 1665, the last in Western Europe in 1722. Numerous theories have beenoffered to explain the disappearance of plague. It has been argued that black rats, the primary carriers of plague, may have been replaced by larger brown rats that donot carry the infection. A second theory suggests that increased immunity among the rodents that carried the disease or chang...

• Black Death .

  disappeared in the West. V DISAPPEARANCE OF PLAGUE Plague became less common in Europe after the 1530s. The last plague in England was in 1665, the last in Western Europe in 1722. Numerous theories have beenoffered to explain the disappearance of plague. It has been argued that black rats, the primary carriers of plague, may have been replaced by larger brown rats that donot carry the infection. A second theory suggests that increased immunity among the rodents that carried the disease or chang...

• Cairo (Egypt) - geography.

  Prize-winning author and Cairo native Naguib Mahfouz, whose fiction has provided a chronicle of the city. VI POINTS OF INTEREST The pyramids of Egypt, which served as tombs for the ancient pharaohs, and the statue of the Sphinx, which dates from about 2500 BC and is probably the country's most famous monument, are located just west of Cairo in the suburb of Giza. Depite the desert background usually depicted in photographs, the pyramids areextremely close to Cairo and are likely to be affecte...

• Army. I INTRODUCTION Army, military land forces of a nation, assembled, drilled, disciplined,

  disappearance for several centuries of large standing armies in Europe. A Middle Ages Feudalism was based on a concept of local defense, each baron or landowner governing land that had been given him by the king, and each lord having his ownpersonal protective forces recruited from among men who worked for him. In return, each lord and his men were pledged to annual service to the monarch and couldbe called on in special instances, as in the defense of Christendom during the Crusades. National...

• Louis Stephen St.

  St. Laurent brought to office a new concept of government. His broad, all-national view firmly rejected Québec's traditional isolationism. He made his decisions with coolimpartiality, giving first consideration to the welfare of Canada as a whole. St. Laurent's foreign policy involved Canada in world politics. He supported the UN, fully endorsing the initiatives proposed by Pearson, his representative there. St.Laurent actively sponsored and subsequently cooperated with the North Atlantic Treaty...

• Louis Stephen St.

  St. Laurent brought to office a new concept of government. His broad, all-national view firmly rejected Québec's traditional isolationism. He made his decisions with coolimpartiality, giving first consideration to the welfare of Canada as a whole. St. Laurent's foreign policy involved Canada in world politics. He supported the UN, fully endorsing the initiatives proposed by Pearson, his representative there. St.Laurent actively sponsored and subsequently cooperated with the North Atlantic Treaty...

• Antibiotics.

  In some species of bacteria the cell wall consists primarily of a thick layer of peptidoglycan. Other species have a much thinner layer of peptidoglycan and an outer aswell as an inner membrane. When bacteria are subjected to Gram's stain, these differences in structure affect the differential staining of the bacteria with a dye calledgentian violet. The differences in staining coloration (gram-positive bacteria appear purple and gram-negative bacteria appear colorless or reddish, depending on t...

• Comte, Isidore-Auguste-Marie-François-Xavier

  1 Life Auguste Comte was born in Montpellier, France. He attended the École Polytechnique, from which he was expelled in 1816, for political reasons. Comte's main concern throughout his life was resolving the political, social and moral problems caused by the French Revolution. To that end, he embarked upon an encyclopedic work, which he first conceived under the inspiration of Henri de Saint-Simon , for whom he worked as secretary from 1817 to 1824. At that time, he proposed several pla...

• Cuban Revolution.

  Confederation of Labor, threw its support behind Batista. In the same month, the U.S. government cut off weapons sales to Batista’s government. U.S. envoys andpolitical moderates in Cuba tried to convince Batista to leave power peacefully, but Batista refused. Meanwhile, revolutionaries from Castro’s movement and from otherorganizations escalated violent resistance. During the second half of 1958, guerrillas seized ground in the countryside from the army. In the cities, several of Batista’sleadi...

• Poliomyelitis.

  Physical therapy helps patients with paralytic polio stretch and move affected muscles. This movement minimizes the atrophy, or shrinkage, of affected muscles andlimbs and builds strength. Exercises can also retrain working muscles to compensate for other muscles that have permanently lost the ability to move. Rehabilitativetherapy trains patients to use braces, crutches, and other devices that provide support and aid mobility. V PREVENTION OF POLIO Immunization with polio vaccine is the best w...

• The Merchant of Venice By William Shakespeare

  The Duke decides to spare Shylock's life, but he does give half of Shylock's money to Antonio, and he gives the rest of it to the state. Antonio says that he will not accept the money if Shylock will agree to become a Christian and if, in his will, he will agree to leave his money to his daughter, Jessica, and her new husband, Lorenzo. Shylock, broken and defeated, agrees to all these conditions and leaves the court. Overjoyed, Antonio and his friends offer to pay the young lawyer whatev...

• Political Parties in the United States.

  quickly enabled the Republican Party to overpower the Know-Nothings. Although the Republicans lost their first campaign for the presidency in 1856, they triumphed in1860 with former congressman Abraham Lincoln. The Republican victory resulted in part from the division of the Democratic Party into Northern and Southern factions,each of which ran its own presidential candidate, and in part from their success at attracting Whigs and Know-Nothings who had opposed the Republicans in 1856.During the C...

• Persian Gulf War.

  to “use all necessary means” to force Iraq from Kuwait if Iraq remained in the country after January 15, 1991. The Iraqis rejected the ultimatum. Soon after the vote,the United States agreed to a direct meeting between Secretary of State James Baker and Iraq’s foreign minister. The two sides met on January 9. Neither offered tocompromise. The United States underscored the ultimatum, and the Iraqis refused to comply with it, even threatening to attack Israel. For the United States, themeeting was...

• Persian Gulf War - History.

  to “use all necessary means” to force Iraq from Kuwait if Iraq remained in the country after January 15, 1991. The Iraqis rejected the ultimatum. Soon after the vote,the United States agreed to a direct meeting between Secretary of State James Baker and Iraq’s foreign minister. The two sides met on January 9. Neither offered tocompromise. The United States underscored the ultimatum, and the Iraqis refused to comply with it, even threatening to attack Israel. For the United States, themeeting was...

• Persian Gulf War - U.

  to “use all necessary means” to force Iraq from Kuwait if Iraq remained in the country after January 15, 1991. The Iraqis rejected the ultimatum. Soon after the vote,the United States agreed to a direct meeting between Secretary of State James Baker and Iraq’s foreign minister. The two sides met on January 9. Neither offered tocompromise. The United States underscored the ultimatum, and the Iraqis refused to comply with it, even threatening to attack Israel. For the United States, themeeting was...

• Louis XIV I INTRODUCTION Louis XIV (1638-1715), king of France (1643-1715), known as the Sun King.

  he could defend against attack from his enemies. In the first instance, Louis worked to tighten central control over the array of departments, regions, and duchies that together made up France. To this end, he revivedthe use of regional intendants, officials who were sent to the provinces with instructions to establish order and effective royal justice. Although agents of the centralgovernment, intendants worked closely with the local nobility and legal institutions to establish efficient admini...

• Louis XIV.

  he could defend against attack from his enemies. In the first instance, Louis worked to tighten central control over the array of departments, regions, and duchies that together made up France. To this end, he revivedthe use of regional intendants, officials who were sent to the provinces with instructions to establish order and effective royal justice. Although agents of the centralgovernment, intendants worked closely with the local nobility and legal institutions to establish efficient admini...

• Frog (animal).

  which means that their body temperature depends on the temperature of the surrounding environment. Few species can tolerate temperatures below 4°C (40°F) orabove 40°C (104°F), and many species can survive only within a narrower range of temperatures. In addition, frogs’ thin, moist skin offers little protection againstwater loss, and when on land the animals must guard against drying out. Many frogs are active at night because temperatures are cooler and humidity is higher thanduring the day. In...

• Frog (animal) - biology.

  which means that their body temperature depends on the temperature of the surrounding environment. Few species can tolerate temperatures below 4°C (40°F) orabove 40°C (104°F), and many species can survive only within a narrower range of temperatures. In addition, frogs’ thin, moist skin offers little protection againstwater loss, and when on land the animals must guard against drying out. Many frogs are active at night because temperatures are cooler and humidity is higher thanduring the day. In...

• Observatory - astronomy.

  Ultraviolet radiation, X rays, and gamma rays have shorter wavelengths than visible light has. These types of radiation tell astronomers about the hottest and mostviolent phenomena in the universe. Earth’s atmosphere blocks most of this radiation, so astronomers must send their observatories above the atmosphere aboardballoons, rockets, or satellites. Ultraviolet telescopes are much like visible light telescopes, but X-ray telescopes must have special nested cylindrical mirrors to prevent Xrays...

• Spanish-American War.

  A Blockade of Cuba The Navy’s basic job was to blockade the island of Cuba. If the Spanish army could be cut off from seaborne supplies from Spain, it could not maintain itself for longagainst the Cuban insurgents, let alone prepare to fight the U.S. forces. To maintain a successful blockade, the U.S. Navy would have to control the sea approaches toCuba. To accomplish this, the United States determined that the Spanish navy had to be destroyed wherever it was found. Thus the U.S. war objectives...

• Glacier.

  covered. In spring the snow cover begins to melt in the lower reaches, exposing the ice surface. As temperatures increase, the melting moves up the glacier. Thesnowline is the highest position the melting reaches during the year. Firn is old granular snow. The firn limit may not exactly coincide with the annual snowline since insome years rapid melting leaves behind firn patches below the snowline. Some glaciers exhibit features called ice streams and icefalls. Ice streams are valley glaciers th...

• Arab-Israeli Conflict.

  the Suez Canal and in 1951 blockaded the Strait of Tiran (Israel’s access to the Red Sea), which Israel regarded as an act of war. In June 1956 Egypt nationalized theSuez Canal, which had been jointly owned by Britain and France. In late October, Israel invaded the Gaza Strip and Sinai Peninsula, defeating Egyptian forces there.Britain and France attacked Egypt a few days later. Although the fighting was brief and Israel eventually withdrew from the Sinai and Gaza, the conflict furtherexacerbate...