1113 résultats pour "only"

• Horse Racing.

  interested parties claim the same horse at the same price, lots are drawn to determine the winning offer. Knowledgeable owners and trainers may use claiming races toobtain, at bargain prices, horses whose former owners underestimated the potential of their animals. Two other types of contests are match races and walkovers. A match race pits only two horses, almost always that season’s most successful racers, in a head-to-headduel. A walkover occurs when only one horse has not been scratched (w...

• Cancer (medicine).

  unable to repair the DNA damage, p53 instructs the cell to undergo programmed cell death, or apoptosis , putting a stop to runaway cell division before it starts. Programmed cell death is a normal part of cell life and is tightly controlled by many genes, primarily p53. In a cancerous cell, one or more mutations prevent these genes from doing their jobs. When mutated, p53 allows a cell to continue to divide, even with damaged DNA.This can lead to additional mutations in proto-oncogenes or tumor...

• Capital Punishment.

  deterrent effect. Capital punishment advocates note that because the death penalty is reserved for the most aggravated murders, the deterrent effect of capitalpunishment on such crimes may not be apparent in data on homicide rates in general. Supporters also urge that the conflicting results of various studies indicate thatthe deterrent effect of the death penalty cannot not be proven or disproven with any certainty. They maintain that in the absence of conclusive proof that the threat ofexecuti...

• John Adams.

  the British authorities. The royal governor, aware of Adams's ability and growing influence, offered him the post of advocate general in the admiralty court. Adams declined the appointment,recognizing it as a bribe to bring him over to the side of the British government. A3 Adams and the Boston Massacre Adams generally supported the popular resistance to the British government, but he did not condone violence or mob action. Adams was greatly disturbed by theBoston Massacre of 1770, an incident...

• John Adams

  the British authorities. The royal governor, aware of Adams's ability and growing influence, offered him the post of advocate general in the admiralty court. Adams declined the appointment,recognizing it as a bribe to bring him over to the side of the British government. A3 Adams and the Boston Massacre Adams generally supported the popular resistance to the British government, but he did not condone violence or mob action. Adams was greatly disturbed by theBoston Massacre of 1770, an incident...

• John Adams - U.

  the British authorities. The royal governor, aware of Adams's ability and growing influence, offered him the post of advocate general in the admiralty court. Adams declined the appointment,recognizing it as a bribe to bring him over to the side of the British government. A3 Adams and the Boston Massacre Adams generally supported the popular resistance to the British government, but he did not condone violence or mob action. Adams was greatly disturbed by theBoston Massacre of 1770, an incident...

• United States Senate.

  providing for military forces, and declaring war. Article I, Section 8, also gives Congress implied powers—to “make all laws which shall be necessary and proper” forcarrying out the enumerated powers, and to investigate and oversee the executive branch. The Senate also has the power to conduct impeachment trials against thepresident, federal judges, and other officials. The Senate can only impeach someone after the House brings charges, however. A two-thirds majority vote of thesenators in the c...

• Track and Field.

  VI RUNNING EVENTS Running events are competitions that test athletes’ quickness, speed, and endurance. Athletes win running races by completing the distance or course in the leastamount of time. A Sprints The shortest running events, called sprints or dashes, are the premier events at a track-and-field meet. The outdoor sprints consist of the 100-meter, 200-meter, and400-meter events. Sprints contested at indoor meets include the 50-meter, 60-meter, 200-meter, and 400-meter events. Past champ...

• Comoros - country.

  Since 1981 the currency has been the Comorian franc. The Comorian franc had a fixed exchange rate with the French franc of 50 to 1 until 1994, when the rate was changed to 75 Comorian francs to 1 French franc. In 2006, the Comorian franc exchanged at an average of 392 to U.S.$1. Transport between the islands is mostly by air, and there is an international airport at Hahaia on Njazidja where jets can land. Road networks have been built betweenmost of the main island settlements, but the mountai...

• One Hundred Years of Olympics.

  Getting over the Hurdles The next three Olympics attracted more athletes and saw stronger performances but otherwise did not measure up to Athens. The 1900 Paris Olympics were upstagedby the concurrent Exposition Universelle and were spread out over two months. The 1904 games in remote St. Louis were subordinated to the Louisiana PurchaseExhibition; over three-fourths of the competitors were Americans, and even Coubertin did not attend. The 1908 London Olympics were also overshadowed byanother...

• James Madison.

  In the spring of 1784 Madison again ran for election to the Virginia assembly, and won. He served nearly three years there, pursuing the same objectives he had foughtfor in Congress. He advocated strengthening the federal government, which was an unpopular position in Virginia, as it was in most of the states. He consistentlysupported measures, at both state and national levels, that would best safeguard the rights of the individual. Madison also continued to oppose any connection betweenchurch...

• James Madison

  In the spring of 1784 Madison again ran for election to the Virginia assembly, and won. He served nearly three years there, pursuing the same objectives he had foughtfor in Congress. He advocated strengthening the federal government, which was an unpopular position in Virginia, as it was in most of the states. He consistentlysupported measures, at both state and national levels, that would best safeguard the rights of the individual. Madison also continued to oppose any connection betweenchurch...

• James Madison - USA History.

  In the spring of 1784 Madison again ran for election to the Virginia assembly, and won. He served nearly three years there, pursuing the same objectives he had foughtfor in Congress. He advocated strengthening the federal government, which was an unpopular position in Virginia, as it was in most of the states. He consistentlysupported measures, at both state and national levels, that would best safeguard the rights of the individual. Madison also continued to oppose any connection betweenchurch...

• Spanish Empire.

  Spain’s royal government quickly imposed its own officials, first to collect taxes and then to administer the colony. Its goal was to assert royal control over both settlersand indigenous peoples. In Spain the government established a House of Trade to supervise colonial affairs and to oversee, license, and tax all trade and commerce. Asthe royal government asserted more authority over colonial activities, Columbus lost effective power, and was eventually replaced by other colonial governors. Wi...

• Spanish Empire .

  Spain’s royal government quickly imposed its own officials, first to collect taxes and then to administer the colony. Its goal was to assert royal control over both settlersand indigenous peoples. In Spain the government established a House of Trade to supervise colonial affairs and to oversee, license, and tax all trade and commerce. Asthe royal government asserted more authority over colonial activities, Columbus lost effective power, and was eventually replaced by other colonial governors. Wi...

• Alphabet I INTRODUCTION Bengali Script India developed a number of different writing systems over the course of its history.

  A Pictographic and Ideographic Systems Early systems of writing used pictures to represent things and then to represent the sounds of those things. Pictographic writing, in which a simplified picture of the sunstood for the word sun, was probably the first step toward a written language. Chinese began as a pictographic language. To represent abstract ideas, the Chinese writing system combined pictographs. For example, the pictographs for sun and tree were combined to represent the concept of...

• Common-sense ethics

  mind, common to all human beings. Reid thought this showed that God meant it to guide our wills. It is both an intellectual and active power. As an intellectual power, it enables us to intuit directly the first principles of morality. Reid thought that moral reasoning, and indeed all reasoning, must start from self-evident first principles which we perceive immediately. If we had to figure out the basic principles of morality by a process of ratiocination, as Locke maintained, morality would not...

• Birding - biology.

  swallows, and rock doves nest on buildings in cities, towns, and farms. The chimney swift has abandoned hollow trees for chimneys as a nest site in urban areas.Mallards and Canada geese—once exclusively wild, migratory species—now live year-round in the open spaces found in city parks and golf courses. Nearly all purplemartins, a songbird species that once used the abandoned nests of woodpeckers or the natural cavities of cliffs or dead trees, now live primarily in structures specificallyconstru...

• Astrobiology - astronomy.

  water to help reactions along. American chemists Stanley Miller and Harold Urey tested part of Oparin and Haldane’s hypothesis in the early 1950s by simulating conditions of the early Earth. In whathas become known as the Miller-Urey experiment, the two scientists connected two flasks with a loop of glass tubing that allowed the gases to pass between the flasks.They filled the upper flask with methane, ammonia, and hydrogen—components thought to have been in the early atmosphere. They filled the...

• 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...

• Holocaust I INTRODUCTION Holocaust, the almost complete destruction of Jews in Europe by Nazi Germany and its collaborators during World War II (1939-1945).

  relation to the Jews. He claimed that the Jews had achieved economic dominance and the ability to control and manipulate the mass media to their own advantage. Hewrote of the need to eradicate their powerful economic position, if necessary by means of their physical removal. IV UNIQUENESS OF NAZI ANTI-SEMITISM The linking of anti-Semitic accusations to race struggle is what made Nazism so genocidal. The Nazis believed the Jews were responsible for what they regarded as thedegeneracy of modern...

• Holocaust .

  relation to the Jews. He claimed that the Jews had achieved economic dominance and the ability to control and manipulate the mass media to their own advantage. Hewrote of the need to eradicate their powerful economic position, if necessary by means of their physical removal. IV UNIQUENESS OF NAZI ANTI-SEMITISM The linking of anti-Semitic accusations to race struggle is what made Nazism so genocidal. The Nazis believed the Jews were responsible for what they regarded as thedegeneracy of modern...

• Mexico City - geography.

  The park houses some of Mexico's most important public buildings, including Chapultepec Castle. Construction of the castle began in 1783. Positioned on the park’shighest elevation, the castle functioned as a fortress during colonial times. It once served as the presidential residence and now houses the National Museum of History,which includes murals by 20th-century Mexican painter Juan O'Gorman. Los Pinos, the official residence and working offices of the president, is also on the grounds, buti...

• Belgium - country.

  European Union (EU) directives aimed at improving Belgium’s environmental conditions concern water treatment and water quality, both significant issues in such anindustrial center. Before these directives were issued, the Meuse River, a major source of drinking water, had become polluted from steel production wastes. Otherrivers were polluted with animal wastes and fertilizers. However, Belgium failed to meet EU targets set for the early 2000s for protecting its rivers from farm pollutionand for...

• Utah - geography.

  Temperatures decrease from the south to the north in the state. In the mountains the average temperature drops about 0.5°C (about 1°F) for every about 300 m(about 1,000 ft) rise in elevation. Average July temperatures range from less than 16°C (60°F) in the mountains to more than 27°C (80°F) in a few locations insouthern Utah. At Salt Lake City average July temperatures range from a low of 18°C (64°F) to a high of 33°C (92°F). There is a great variation between daytime andnighttime temperatures,...

• Utah - USA History.

  Temperatures decrease from the south to the north in the state. In the mountains the average temperature drops about 0.5°C (about 1°F) for every about 300 m(about 1,000 ft) rise in elevation. Average July temperatures range from less than 16°C (60°F) in the mountains to more than 27°C (80°F) in a few locations insouthern Utah. At Salt Lake City average July temperatures range from a low of 18°C (64°F) to a high of 33°C (92°F). There is a great variation between daytime andnighttime temperatures,...

• Laser.

  their atoms into laser light. Consequently, they are the most powerful continuous wave (CW) lasers—that is, lasers that emit light continuously rather than in pulses. C Liquid Lasers The most common liquid laser media are inorganic dyes contained in glass vessels. They are pumped by intense flash lamps in a pulse mode or by a separate gas laserin the continuous wave mode. Some dye lasers are tunable, meaning that the color of the laser light they emit can be adjusted with the help of a prism lo...

• Zebra - biology.

  C Life Span Captive zebras have lived into their late 30s. Life expectancy in the wild, where predators abound, is probably not much more than 12 years. IV SOCIAL BEHAVIOR Like horses, zebras have large brains and a wide variety of social behaviors. Although they cannot match the overall intelligence of mammals that hunt, zebras interactwith each other in complex ways. Zebras usually live in groups known as herds, but the social structure of these groups depends on the species. The plains zeb...

• Galileo I INTRODUCTION Galileo (1564-1642), Italian physicist and astronomer who, with German astronomer Johannes Kepler, initiated the scientific revolution that flowered in the work of English physicist Sir Isaac Newton.

  V WORK IN ASTRONOMY During most of his time in Padua, Galileo showed little interest in astronomy, although in 1595 he declared in a letter that he preferred the Copernican theory that Earthrevolves around the Sun to the assumptions of Aristotle and Ptolemy that planets circle a fixed Earth ( see Astronomy: The Copernican Theory ; Ptolemaic System). A Observations with the Telescope In 1609 Galileo heard that a telescope had been invented in Holland. In August of that year he constructed a t...

• Galileo.

  V WORK IN ASTRONOMY During most of his time in Padua, Galileo showed little interest in astronomy, although in 1595 he declared in a letter that he preferred the Copernican theory that Earthrevolves around the Sun to the assumptions of Aristotle and Ptolemy that planets circle a fixed Earth ( see Astronomy: The Copernican Theory ; Ptolemaic System). A Observations with the Telescope In 1609 Galileo heard that a telescope had been invented in Holland. In August of that year he constructed a t...

• French and Indian War.

  Virginia as well as the French governor-general of Canada had attempted to seize their lands. After receiving large presents of supplies and arms, the Iroquoisgrudgingly renewed their alliances with the British colonies. Delegates then moved on to plan other defensive measures. An important topic was a plan of union developed by Benjamin Franklin. The Albany Plan, as it became known, proposed a single institution to govern all of the Britishcolonies in America. Under the plan, each colony would...

• French and Indian War - Canadian History.

  Virginia as well as the French governor-general of Canada had attempted to seize their lands. After receiving large presents of supplies and arms, the Iroquoisgrudgingly renewed their alliances with the British colonies. Delegates then moved on to plan other defensive measures. An important topic was a plan of union developed by Benjamin Franklin. The Albany Plan, as it became known, proposed a single institution to govern all of the Britishcolonies in America. Under the plan, each colony would...

• Excerpt from Our Mutual Friend - anthology.

  The Podsnaps lived in a shady angle adjoining Portman Square. They were a kind of people certain to dwell in the shade, wherever they dwelt. Miss Podsnap's lifehad been, from her first appearance on this planet, altogether of a shady order; for, Mr Podsnap's young person was likely to get little good out of association withother young persons, and had therefore been restricted to companionship with not very congenial older persons, and with massive furniture. Miss Podsnap's earlyviews of life be...

• Virus (life science) - biology.

  RNA into DNA earned them their name because this process is the reverse of the usual transfer of genetic information, from DNA to RNA.) The DNA form of theretrovirus genome is then integrated into the cellular DNA and is referred to as the provirus. The viral genome is replicated every time the host cell replicates its DNA and is thus passed on to daughter cells. Hepatitis B virus can also transcribe RNA to DNA, but this virus packages the DNA version of its genome into virus particles. Unlike...

• Snake (reptile).

  in their heads that conduct sound. They are able to hear low-frequency sounds and to sense vibrations that travel through the ground or water. The majority of snakeshave good eyesight, especially for detecting moving objects, although most burrowing snakes can only distinguish between light and dark. Pit vipers, boas, and pythons have an unusual adaptation for detecting warm-blooded prey and predators. On the heads of these snakes are small pits lined with cellsthat are extremely sensitive to he...

• Estonia - country.

  protest the expansion of open-pit phosphorite mining in northeastern Estonia. Their success in stopping the expansion prompted further demonstrations as part of thecountry’s independence movement. Since independence Estonia has taken measures to protect the environment. The government has ratified international agreementsto reduce emissions of hazardous wastes and greenhouse gases, as well as to protect biodiversity, wetlands, and endangered species. Estonians cherish thecountryside, and 31 perc...

• Radar.

  gathers the weak returning radar signals and converts them into an electric current. Because a radar antenna may both transmit and receive signals, the duplexerdetermines whether the antenna is connected to the receiver or the transmitter. The receiver determines whether the signal should be reported and often does furtheranalysis before sending the results to the display. The display conveys the results to the human operator through a visual display or an audible signal. B1 The Antenna The rec...

• North America - Geography.

  D Climate Although North America has considerable climatic variety, five principal climatic regions can be identified. The northern two-thirds of Canada and Alaska, as well as all ofGreenland, have subarctic and arctic climates, in which long, dark, bitterly cold winters alternate with brief, mild summers. Most of the region, which receives relativelylittle precipitation, is covered with snow and ice during much of the year. A second climatic region is made up of the eastern two-thirds of the U...

• Boston - geography.

  The neighborhoods of Allston and Brighton occupy the northwest corner of the city to the west of Fenway. The Allston-Brighton area is bordered to the east, north, andwest by the Charles River and to the south by the Massachusetts Turnpike and the town of Brookline. It is an industrial and residential neighborhood that is also thelocation of Boston College and Harvard University Business School. Boston has been unsuccessful in annexing Brookline, the birthplace of U.S. president John F.Kennedy an...

• Vietnam War.

  rigged, since about 150,000 more people voted in Saigon than were registered. Diem then deposed Bao Dai, who had been the only other candidate, and declaredSouth Vietnam to be an independent nation called the Republic of Vietnam (RVN), with himself as president and Saigon as its capital. Vietnamese Communists and manynon-Communist Vietnamese nationalists saw the creation of the RVN as an effort by the United States to interfere with the independence promised at Geneva. III THE BEGINNING OF THE...

• Vietnam War - History.

  rigged, since about 150,000 more people voted in Saigon than were registered. Diem then deposed Bao Dai, who had been the only other candidate, and declaredSouth Vietnam to be an independent nation called the Republic of Vietnam (RVN), with himself as president and Saigon as its capital. Vietnamese Communists and manynon-Communist Vietnamese nationalists saw the creation of the RVN as an effort by the United States to interfere with the independence promised at Geneva. III THE BEGINNING OF THE...

• Vietnam War - U.

  rigged, since about 150,000 more people voted in Saigon than were registered. Diem then deposed Bao Dai, who had been the only other candidate, and declaredSouth Vietnam to be an independent nation called the Republic of Vietnam (RVN), with himself as president and Saigon as its capital. Vietnamese Communists and manynon-Communist Vietnamese nationalists saw the creation of the RVN as an effort by the United States to interfere with the independence promised at Geneva. III THE BEGINNING OF THE...

• Ontario - Geography.

  governed Ontario’s initial settlement and development. The province’s most important river is the St. Lawrence. Its route was much improved and enlarged by dredgingand canal building in the mid-20th century. This enabled large ocean-going vessels to reach Great Lake ports ( see St. Lawrence Seaway). The Ottawa River was an important early route to the interior for fur traders and timber merchants. The Niagara River, because of its falls, is a great center of hydroelectric power as well as aninte...

• Ontario - Canadian History.

  governed Ontario’s initial settlement and development. The province’s most important river is the St. Lawrence. Its route was much improved and enlarged by dredgingand canal building in the mid-20th century. This enabled large ocean-going vessels to reach Great Lake ports ( see St. Lawrence Seaway). The Ottawa River was an important early route to the interior for fur traders and timber merchants. The Niagara River, because of its falls, is a great center of hydroelectric power as well as aninte...

• Vertebrate - biology.

  E Reptiles Compared to amphibians, reptiles are much more fully adapted to life on land. They have scaly, waterproof skin, and they either give birth to live young or lay eggs withwaterproof shells. There are about 7,000 species alive today, including snakes, alligators, and turtles. During the age of the dinosaurs, about 230 million to 65 millionyears ago, reptiles outnumbered all other land vertebrates put together. F Birds Birds evolved from flightless reptiles but underwent some major chan...

• Unemployment.

  set up to monitor the economy and provide advice to the president and Congress. Between 1945 and 1990 nine cyclical swings in unemployment occurred; all weresmaller than the 1930s depression. During this period the unemployment rate was as low as 2.9 percent (1953) and as high as 9.7 percent (1982). Because of cutbacksin the unemployment insurance program and changes in the nature of employment during the 1980s, however, only 37 percent of jobless workers received benefits in1990. Fears that the...

• Penguin - biology.

  B Parents and Offspring Once female penguins lay their eggs, both the parents incubate the eggs. The incubation period varies according to species, ranging from 33 days for the little penguinto about 63 days for the emperor penguin. In most medium-sized penguins incubation takes 35 to 38 days. The incubation routine is highly variable among penguinspecies, although in general both sexes participate in incubation and feeding of young. Male and female Adélie penguins take turns incubating their e...

• Plato I INTRODUCTION Plato (428?

  one of the individuals escapes from the cave into the light of day. With the aid of the sun, that person sees for the first time the real world and returns to the cave withthe message that the only things they have seen heretofore are shadows and appearances and that the real world awaits them if they are willing to struggle free oftheir bonds. The shadowy environment of the cave symbolizes for Plato the physical world of appearances. Escape into the sun-filled setting outside the cave symbolize...

• Plato.

  one of the individuals escapes from the cave into the light of day. With the aid of the sun, that person sees for the first time the real world and returns to the cave withthe message that the only things they have seen heretofore are shadows and appearances and that the real world awaits them if they are willing to struggle free oftheir bonds. The shadowy environment of the cave symbolizes for Plato the physical world of appearances. Escape into the sun-filled setting outside the cave symbolize...

• D-Day Invasion.

  The Allied planners focused on the beaches around Caen and the Cotentin Peninsula in northern France rather than those of Calais, even though it meant the forcewould be crossing at a wider part of the English Channel. That disadvantage was far outweighed by what the site offered: comparatively scanty defensive fortificationsand beachhead ideally suited for successful exits. The clincher was an isolated battlefield that the Germans would have difficulty reinforcing. The date was set for May 1, 19...