Delaware River, river of the Atlantic slope of the United States, meeting tidewater at Trenton, New Jersey, about 130 miles (210 km) above its mouth. Its total length (including the longest branch) is about 405 miles (650 km), and the river drains an area of 11,440 square miles (29,630 square km).

Delaware River: …Incodel were absorbed by the Delaware River Basin Commission (DRBC), the body established the previous year to replace it. The DRBC—which included the four basin state governors and the division engineer of the regional U.S. Army Corps of Engineers—was the first equal partnership between federal and state governments in river…

Delaware State University, public, coeducational historically black institution of higher learning in Dover, Del., U.S. It is a land-grant university consisting of a College of Arts and Sciences and schools of Management; Education and Professional Studies, including aviation, education, and

Delaware: Education: Delaware Technical and Community College, founded by the state in 1967, maintains campuses in all three counties. The Delaware campus of the Widener University law school (1971; affiliated with Widener since 1975) is located north of Wilmington. Other private colleges include Wilmington College (1968); Goldey-Beacom…

George Inness: …Water Gap (1861) and the Delaware Valley (1865). His characteristic small canvases from this period show that he was no longer strictly preoccupied with the carefully rendered detail of the Hudson River school but instead began to explore light and colour in the manner of Camille Corot and the French…

George Inness: …with works such as the Delaware Water Gap (1861) and the Delaware Valley (1865). His characteristic small canvases from this period show that he was no longer strictly preoccupied with the carefully rendered detail of the Hudson River school but instead began to explore light and colour in the manner…

U.S. state flag consisting of a blue field (background) with a buff (light tan) diamond bearing a central coat of arms above the inscription “December 7, 1787.”During the Revolutionary War (1775–83) distinctive colours were carried by troops from Delaware, but an official state flag was not adopted

Delaware, Lackawanna and Western Railroad Company, American railroad built to carry coal from the anthracite fields of northeastern Pennsylvania. Originally known as Ligget’s Gap Railroad, it was chartered in 1851 as the Lackawanna and Western. Eventually it ran from the Lackawanna Valley in

Lehigh Valley Railroad Company, American railroad whose growth was based on hauling coal from the anthracite mines of northeastern Pennsylvania. Originally founded in 1846 as the Delaware, Lehigh, Schuylkill, and Susquehanna Railroad Company, it changed its name to Lehigh Valley in 1853. It

Thomas West, 12th Baron De La Warr was one of the English founders of Virginia, for whom Delaware Bay, the Delaware River, and the state of Delaware were named. The son of Thomas West, the 11th Baron (c. 1556–1602), the younger West fought in the Netherlands and in Ireland under Robert Devereux,

University of Delaware, public, coeducational institution of higher learning in Newark, Del., U.S. It also offers courses at other sites, including Wilmington, Dover, Georgetown, and Lewes. The university consists of seven colleges offering a curriculum in the arts, sciences, agriculture, business,

television: SECAM: …device is known as a delay line; it holds the information of each line scan for 64 microseconds, the time required to complete the next line scan. To match successive pairs of lines, an electronic switch is also needed. When the use of delay lines was first proposed, such lines…

delay of gratification, the act of resisting an impulse to take an immediately available reward in the hope of obtaining a more-valued reward in the future. The ability to delay gratification is essential to self-regulation, or self-control. To study the conditions that promote delay of

explosive: Delay systems: Delay, or rotational, shooting has many advantages over instantaneous firing in almost all types of blasting. It generally gives better fragmentation, more efficient use of the explosive, reduced vibration and concussion, and better control of the rock. For these, and sometimes other reasons,…

French literature: Historical fiction: …the censor for 11 years; Florence Delay in her stylish novel L’Insuccès de la fête (1980; “The Failure of the Feast”); and, especially, Nobel Prize-winning author Claude Simon, many of whose works, notably La Route des Flandres (1960; The Flanders Road), Histoire (1967; “Tale”; Eng. trans. Histoire), and Les Géorgiques…

Tom DeLay is an American Republican politician who served as a representative from Texas in the U.S. House of Representatives (1985–2006). He served as majority whip (1995–2003) and majority leader (2003–06) but resigned from the House in June 2006 in the face of corruption charges. DeLay spent a

Tom DeLay is an American Republican politician who served as a representative from Texas in the U.S. House of Representatives (1985–2006). He served as majority whip (1995–2003) and majority leader (2003–06) but resigned from the House in June 2006 in the face of corruption charges. DeLay spent a

immune system disorder: Type IV hypersensitivity: Type IV hypersensitivity is a cell-mediated immune reaction. In other words, it does not involve the participation of antibodies but is due primarily to the interaction of T cells with antigens. Reactions of this kind depend on the presence in the circulation…

nuclear weapon: Residual radiation and fallout: Delayed fallout, which arrives after the first day, consists of microscopic particles that are dispersed by prevailing winds and settle in low concentrations over possibly extensive portions of Earth’s surface.

Walter Mischel: …for his groundbreaking study on delayed gratification known as “the marshmallow test.”

immune system disorder: Type IV hypersensitivity: Type IV hypersensitivity is a cell-mediated immune reaction. In other words, it does not involve the participation of antibodies but is due primarily to the interaction of T cells with antigens. Reactions of this kind depend on the presence in the circulation…

bear: Natural history: …dormant in the uterus (delayed implantation), which ensures the birth of young while the female is in the winter den and guarantees that the cubs will emerge from the den in the spring, when food is abundant. Ursids breed once per year at most, and many bears breed only…

Russian literature: Literature under Soviet rule: …after they were written (“delayed” literature). Moreover, literature publishable at one time often lost favour later; although nominally acceptable, it was frequently unobtainable. On many occasions, even officially celebrated works had to be rewritten to suit a shift in the Communist Party line. Whereas pre-Revolutionary writers had been intensely…

delayed puberty, failure of the physical development of the reproductive system by the normal stage or period of life when a child transforms into an adult capable of procreation. In girls, puberty is considered to be delayed if no pubertal development has occurred by age 13 or 14, and girls who

nervous system: Potassium channels: This occurs through the delayed rectifier channel (IDR), which, activated by the influx of Na+, counteracts the effect of that cation by allowing the discharge of K+. By repolarizing the membrane in this way, the IDR channel restricts the duration of the nerve impulse and participates in the regulation…

poison: Immediate versus delayed toxic responses: …standard of minimum time for delayed toxic responses, but generally a response that takes more than a few days to develop is considered delayed. The time it takes for a systemic toxicant to act depends on many factors, such as the rates of absorption, biotransformation, distribution, and excretion, as well…

Afghanistan: The Kushāns: A massive Kushān city at Delbarjin, north of Balkh, and a major gold hoard of superb artistry near Sheberghān, west of Balkh, also have been excavated.

Sven Delblanc was a Swedish novelist who was notable for his use of the intrusive narrator and for the incorporation of grotesque, visionary, and mythical elements to give detailed descriptions of society in his work. Delblanc taught at the University of Uppsala until the early 1970s, when he began

Sven Delblanc was a Swedish novelist who was notable for his use of the intrusive narrator and for the incorporation of grotesque, visionary, and mythical elements to give detailed descriptions of society in his work. Delblanc taught at the University of Uppsala until the early 1970s, when he began

Berthold Delbrück was a German linguist who addressed himself to the problems of syntax (the patterning of words into meaningful phrases and sentences). He is credited with having founded the study of the comparative syntax of the Indo-European languages. In 1871 Delbrück published his classic

strategy: Strategy in antiquity: …the 19th-century German military historian Hans Delbrück drew a fundamental distinction between strategies based on overthrow of the opponent and those aimed at his exhaustion. Both Sparta and Athens pursued the latter; the former was simply unavailable, given their fundamental differences as military powers. Delbrück’s analysis illustrates the ways in…

Rudolph von Delbrück was a statesman and chief executor of Chancellor Otto von Bismarck’s free-trade policy for Prussia and then for imperial Germany. He entered government service in 1837 and in 1848 was transferred to the ministry of commerce. Realizing the influence of commerce on political

Max Delbrück was a German-born U.S. biologist, a pioneer in the study of molecular genetics. With Alfred Day Hershey and Salvador Luria, he was awarded the 1969 Nobel Prize for Physiology or Medicine for work on bacteriophages—viruses that infect bacteria. Delbrück received a Ph.D. in physics

Rudolph von Delbrück was a statesman and chief executor of Chancellor Otto von Bismarck’s free-trade policy for Prussia and then for imperial Germany. He entered government service in 1837 and in 1848 was transferred to the ministry of commerce. Realizing the influence of commerce on political

Théophile Delcassé was a French foreign minister (1898–1905 and 1914–15) who was a principal architect of the new system of European alliances formed in the years preceding World War I. Delcassé was a journalist who vigorously supported the moderate republican programs of Léon Gambetta and the

Charles F. Kettering: Deeds, Kettering founded Delco (Dayton Engineering Laboratories Company) to design automotive electrical equipment. He developed improved lighting and ignition systems as well as the first electric starter, which was introduced on Cadillacs in 1912.

art criticism: The growth of power and influence: Thus, for example, French critic Étienne-Jean Delécluze was a supporter of the “Homerists,” followers of Ingres’s style, and deplored the “école du laid” (“school of ugliness”) of the “Shakespeareans,” who emulated Delacroix. But this debate would become moot with the development of the avant-garde.

Grazia Deledda was a novelist who was influenced by the verismo (q.v.; “realism”) school in Italian literature. She was awarded the Nobel Prize for Literature in 1926. Deledda married very young and moved to Rome, where she lived quietly, frequently visiting her native Sardinia. With little formal

presidency of the United States of America: Post-1968 reforms: …national conventions, most of the delegates are selected through primaries—or, in a minority of states, through caucuses—and the delegates gather merely to ratify the choice of the voters.

Subcomandante Marcos is a Mexican professor who was the leader of the Zapatista National Liberation Army (Ejército Zapatista de Liberación Nacional; EZLN, also called the Zapatistas), which launched a rebellion in 1994 in the state of Chiapas and later functioned as a political movement defending

Egypt: Ismāʿīl, 1863–79: …consultative council known as the Assembly of Delegates, the members of which were chosen by indirect election, the great majority of those elected were village headmen. While Ismāʿīl did not intend to give any of his powers to the Assembly, its establishment and composition pointed to the political growth that…

Guild Socialism: …the rise of the left-wing shop stewards’ movement, demanding “workers’ control” in the war industries. After the war, the building workers, led by Hobson and Malcolm Sparkes, founded building guilds that built houses for the state; but after the economic slump of 1921 the state withdrew financial help and the…

Hippolyte Delehaye was a Belgian scholar who was the foremost exponent of biographical church history based on archaeological and documentary work. He became a Jesuit in 1879 and was ordained priest in 1890, later identifying himself with the work of the Bollandists (q.v.) and becoming their head

Delémont, capital of Jura canton, northwestern Switzerland, situated in a wide valley at the confluence of the Sorne and Birse rivers. First mentioned in historical records in 727, Delémont was annexed by the prince-bishops of Basel in the 11th century for use as a summer residence. Seized by

Charles Delescluze was a French revolutionary figure who participated in the uprisings of 1830 and 1848 and who was an important leader in the Paris Commune (1871). Delescluze, an ardent radical republican, was still a student during the popular uprisings of 1830. As an activist in the secret

Charles Delescluze was a French revolutionary figure who participated in the uprisings of 1830 and 1848 and who was an important leader in the Paris Commune (1871). Delescluze, an ardent radical republican, was still a student during the popular uprisings of 1830. As an activist in the secret

origins of agriculture: The sugar beet: In 1808 a French scientist, Benjamin Delessert, used charcoal in clarification, which insured the technical success of beet sugar. On March 25, 1811, Napoleon issued a decree that set aside 80,000 acres (about 32,375 hectares) of land for the production of beets, established six special sugar-beet schools to which 100…

heredity: Deletions: The simplest, but perhaps most damaging, structural change is a deletion—the complete loss of a part of one chromosome. In a haploid cell this is lethal, because part of the essential genome is lost. However, even in diploid cells deletions are generally lethal or…

Gilles Deleuze was a French writer and antirationalist philosopher. Deleuze began his study of philosophy at the Sorbonne in 1944. Appointed to the faculty there in 1957, he later taught at the University of Lyons and the University of Paris VIII, where he was a popular lecturer. He retired from

Delft, gemeente (municipality), western Netherlands. It lies along the canalized Schie River between Rotterdam and The Hague. Founded in 1075 and chartered in 1246, it was severely damaged by fire in 1536 and by the explosion of a powder magazine in 1654. Delft was a trade centre in the 16th and

delftware, tin-glazed earthenware first made early in the 17th century at Delft, Holland. Dutch potters later brought the art of tin glazing to England along with the name delft, which now applies to wares manufactured in the Netherlands and England, as distinguished from faience, made in France,

Wubbo Ockels: …he began teaching at the Delft University of Technology in Delft, Netherlands, and in 2003 he was made a full professor of aerospace for sustainable engineering and technology.

Jacoba Of Bavaria: …July 3, 1428, in the Treaty of Delft, which maintained Jacoba’s title of countess but transferred administration of her three counties (Holland, Zeeland, and Hainaut) to Philip and stipulated that she was not to marry without his consent.

delftware, tin-glazed earthenware first made early in the 17th century at Delft, Holland. Dutch potters later brought the art of tin glazing to England along with the name delft, which now applies to wares manufactured in the Netherlands and England, as distinguished from faience, made in France,

Groningen: …processing in the north, and Delfzijl, connected with Groningen by the Ems ship canal, is a busy port with chemical industries (salt). Winschoten is a marketing and shopping centre. Area 1,146 square miles (2,968 square km). Pop. (2009 est.) 574,092.

cacos: … were such prominent Creoles as José Matías Delgado and Pedro Molina, liberals who demanded independence under a federalist anticlerical constitution. They were opposed by the more conservative gazistas, led by José Cecilio del Valle, who insisted upon protection for private property and gradual change but also advocated safeguarding political liberties.…

Uruguay: The arts: …work of the landscape architect Leandro Silva Delgado has also earned international prominence.

critical race theory: Basic tenets of critical race theory: According to the legal scholars Richard Delgado (one of the founders of CRT) and Jean Stefancic there are several general propositions regarding race and racism that many critical race theorists would accept, despite the considerable variation of belief among members of the movement. These propositions constitute a set of “basic…

Selenga River: …confluence of the Ider and Delger rivers. It is Mongolia’s principal river and is the most substantial source of water for Lake Baikal.

Delhi, city and national capital, and union territory, north-central India. The city of Delhi actually consists of two components: Old Delhi, in the north, the historic city; and New Delhi, in the south, since 1947 the capital of India, built in the first part of the 20th century as the capital of

Delhi: national capital, and union territory, north-central India. The city of Delhi actually consists of two components: Old Delhi, in the north, the historic city; and New Delhi, in the south, since 1947 the capital of India, built in the first part of the 20th century…

cutaneous leishmaniasis, infectious skin disease that is caused by any of multiple different trypanosome parasites in the genus Leishmania. The disease is the most commonly occurring form of leishmaniasis and is prevalent especially in the Americas, Asia, the Mediterranean, and the Middle East.

Kushal Pal Singh: …an Indian businessman who transformed Delhi Land & Finance Limited (DLF) into one of India’s largest real-estate development firms.

Delhi Pact, pact made on April 8, 1950, following the escalation of tension between India and Pakistan in East Pakistan (now Bangladesh) after economic relations between the two countries had been severed in December 1949. An estimated one million people—Hindus from East Pakistan and Muslims from

Delhi sultanate, principal Muslim sultanate in north India from the 13th to the 16th century. Its creation owed much to the campaigns of Muʿizz al-Dīn Muḥammad ibn Sām (Muḥammad of Ghūr; brother of Sultan Ghiyāth al-Dīn of Ghūr) and his lieutenant Quṭb al-Dīn Aibak between 1175 and 1206 and

Delhi Zoological Park, zoo founded in 1957 in New Delhi, India. Its facilities are funded and administered by the national government. More than 1,700 specimens representing at least 185 species are exhibited and bred in the 97-hectare (240-acre) park. The collection includes good breeding groups

Battle of Delhi, (17 December 1398). In 1398 the Mongol-Turkish warrior Timur, ruler of Central Asia from his capital at Samarkand, found a pretext to strike south into India. His victory over the sultan of Delhi confirmed the irresistible fighting qualities of his army and the awesome

metalwork: Iron: The wrought-iron pillar of Delhi, set up about ad 400 by Kumara Gupta I in honour of his father, is more than 23 feet (7 metres) tall and weighs more than 6 tons. It demonstrates the abilities of Indian metalworkers in handling large masses of material, for not until…

Siege of Delhi, (8 June–21 September 1857). The hard-fought recapture of Delhi by the British army was a decisive moment in the suppression of the 1857–58 Indian Mutiny against British rule. It extinguished Indian dreams of recreating the rule of the Mughal Empire. The rebellion lost its cohesion,

University of Delhi, state-controlled institution of higher education located at Delhi, India. Founded in 1922 as a residential university, it developed into a teaching and affiliating body and is now designated as one of India’s federal universities, with jurisdiction over numerous colleges

Jelālī Revolts: His brother Deli Hasan then seized Kutahya, in western Anatolia, but later he and his followers were won over by grants of governorships.

Delia, ancient quadrennial festival of the Ionians, held on Delos (hence the name) in honour of the Greek god Apollo. The local title was Apollonia, which seems always to have been used for the corresponding yearly festival. It later declined along with the political importance of Ionia but was

anthomyiid fly: The onion maggot (D. antiqua), found in North America, injures onions by feeding on the underground bulb and stem. The adult is a bristly gray fly about 6 or 7 mm (0.2 to 0.3 inch) long with large wings. It is best controlled by insecticide applications…

anthomyiid fly: The seedcorn maggot (D. platura) feeds on the seeds and seedlings of a variety of crops, including corn (maize), peas, and different types of beans. Damaged seeds either develop into weak plants or fail to sprout. This species has a short life cycle and produces three…

anthomyiid fly: The cabbage maggot (Delia radicum) is an important pest in Canada and the northern United States. The larvae feed on the underground parts of cabbage, cauliflower, broccoli, radishes, and turnips. It was introduced from Europe early in the second half of the 19th century. The most-effective…

Delian League, confederacy of ancient Greek states under the leadership of Athens, with headquarters at Delos, founded in 478 bce during the Greco-Persian wars. The original organization of the league, as sketched by Thucydides, indicates that all Greeks were invited to join to protect themselves

Delian League, confederacy of ancient Greek states under the leadership of Athens, with headquarters at Delos, founded in 478 bce during the Greco-Persian wars. The original organization of the league, as sketched by Thucydides, indicates that all Greeks were invited to join to protect themselves

consanguinity: Advantageous heterozygosity: The principle of deliberate inbreeding is used with domestic animals to eliminate covert recessive alleles from the stock. However, health problems do exist even in very highly inbred “pure” lines, and some degree of allele heterozygosity would appear to be advantageous. Many species, including humans, have been established…

St. Gerard: …period that Gerard wrote his Deliberatio supra hymnum trium puerorum (“Meditation on the Hymn of the Three Young Men”), the oldest surviving work of Hungarian theological literature.

deliberative democracy, school of thought in political theory that claims that political decisions should be the product of fair and reasonable discussion and debate among citizens. In deliberation, citizens exchange arguments and consider different claims that are designed to secure the public

20th-century international relations: Three tests: Dubbed “deliberative multilateralism,” it seemed another example of reactive ad hoc policy making.

oratory: …and statesman, was a great deliberative orator. In one of his greatest speeches, “On the Crown,” he defended himself against the charge by his political rival Aeschines that he had no right to the golden crown granted him for his services to Athens. So brilliant was Demosthenes’ defense of his…

Miguel Delibes was a Spanish novelist, essayist, and journalist who wrote widely of travel, the outdoors, sport, and his native Valladolid. His realist fiction is best known for its critical analysis of 20th-century Spanish society. Delibes was the third of eight sons born to a schoolteacher and a

Léo Delibes was a French opera and ballet composer who was the first to write music of high quality for the ballet. His pioneering symphonic work for the ballet opened up a field for serious composers, and his influence can be traced in the work of Tchaikovsky and others who wrote for the dance.

Léo Delibes was a French opera and ballet composer who was the first to write music of high quality for the ballet. His pioneering symphonic work for the ballet opened up a field for serious composers, and his influence can be traced in the work of Tchaikovsky and others who wrote for the dance.

Miguel Delibes was a Spanish novelist, essayist, and journalist who wrote widely of travel, the outdoors, sport, and his native Valladolid. His realist fiction is best known for its critical analysis of 20th-century Spanish society. Delibes was the third of eight sons born to a schoolteacher and a

Arches National Park: …resemble skyscrapers), The Windows Section, Delicate Arch, Fiery Furnace (so named because it glows in the setting sun), and Devils Garden. Landscape Arch, measuring about 290 feet (88 metres) long from base to base, is one of the longest natural freestanding spans of rock in the world; since 1991 large…

A Delicate Balance, drama in three acts by Edward Albee, published and produced in 1966 and winner of a Pulitzer Prize in 1967. The play, about a middle-aged couple’s struggle to restore the “balance” of their routine after it has been threatened by intruding friends, is representative of the

Paul Scofield: …Lear (1971) and Tobias in A Delicate Balance (1973), written by Edward Albee and directed by Tony Richardson, from the Albee play. He also played the French king in Kenneth Branagh’s version of Henry V (1989) and Judge Thomas Danforth in a film adaptation of Arthur Miller’s The Crucible (1996).

Jerry Lewis: …of solo comedies, starting with The Delicate Delinquent (1957) and often working with director Frank Tashlin. In 1959 he signed a new contract with Paramount that gave him 60 percent of box-office profits and allowed him to write and direct his own films, beginning with The Bellboy (1960). Many of…

John le Carré: In A Delicate Truth (2013) a young civil servant attempts to discern what actually occurred during the officially successful special rendition of a terrorist. A Legacy of Spies (2017) revisits The Spy Who Came In from the Cold and features both old and new characters. In…

martin: The house martin (Delichon urbica), blue-black above and white-rumped, is common in Europe. The African river martin (Pseudochelidon eurystomina) of the Congo River is black, with red eyes and bill; it is sometimes placed in a separate family, Pseudochelidonidae. The so-called bee-martin, or bee bird, is…

number game: Pioneers and imitators: …in 1636 under the title Deliciae Physico-mathematicae oder Mathematische und Philosophische Erquickstunden. Immensely popular, Schwenter’s book was enlarged by two supplementary editions in 1651–53. For some years thereafter Schwenter’s enlarged edition was the most comprehensive treatise of its kind, although in 1641–42 the Italian Jesuit Mario Bettini had issued a…

Mexico: Agriculture: This was followed by the Las Delicias Project near Chihuahua, which also featured cotton but later brought substantial acreages of wheat into production. Wheat, especially north of Sinaloa, is the most important crop in the Northwest, which is now the country’s centre of grain production. Cotton, vegetables, and oilseeds are…

delict, in Roman law, an obligation to pay a penalty because a wrong had been committed. Not until the 2nd and 3rd centuries ad were public crimes separated from private crimes and removed to criminal courts; from that time, civil action remained the remedy for private abuses. In modern usage in

Maurice Scève: Scève’s Délie, objet de plus haute vertu (1544; “Délie, Object of Highest Virtue”) is a poetic cycle of 449 highly organized decasyllabic 10-line stanzas (dizains), rich in imagery and Platonic and Petrarchan in theme and style. “Délie” (an anagram of “L’Idée,” “The Idea”), long thought to…

Ted Kooser: …received a Pulitzer Prize for Delights & Shadows (2004). Valentines (2008) contains poems Kooser wrote over the course of two decades on the occasion of Valentine’s Day. He subsequently published the collections Splitting an Order (2014), Kindest Regards: New and Selected Poems (2018), and Red Stilts (2020).

Theódoros Dhiliyiánnis was a politician who was prime minister of Greece five times (1885–86, 1890–92, 1895–97, 1902–03, 1904–05). He was a resolute advocate of aggressive and often irresponsible territorial expansion. His bitter rivalry with the reformist politician Kharílaos Trikoúpis dominated

Pierre Deligne is a Belgian mathematician who was awarded the Fields Medal (1978), the Crafoord Prize (1988), and the Abel Prize (2013) for his work in algebraic geometry. Deligne received a bachelor’s degree in mathematics (1966) and a doctorate (1968) from the Free University of Brussels. After a

Pierre Deligne is a Belgian mathematician who was awarded the Fields Medal (1978), the Crafoord Prize (1988), and the Abel Prize (2013) for his work in algebraic geometry. Deligne received a bachelor’s degree in mathematics (1966) and a doctorate (1968) from the Free University of Brussels. After a