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  • dwarf hutia (rodent)

    hutia: Size ranges from the rat-sized dwarf hutia (Mesocapromys nanus), with a body length of 20 to 30 cm (8 to 12 inches), to the raccoon-sized Desmarest’s Cuban hutia (Capromys pilorides), with a body 32 to 60 cm long and weight of up to 8.5 kg (19 pounds). The tail ranges…

  • dwarf lateral branch (plant anatomy)

    gymnosperm: Ginkgophyta: …branches: elongated major branches and dwarf lateral branches that bear leaves. After several years those dwarf shoots develop into short stubby outgrowths from the stem.

  • dwarf laurel (shrub)

    Lambkill, (species Kalmia angustifolia), an open upright woody shrub of the heath family (Ericaceae). Lambkill is 0.3–1.2 m (1–4 feet) tall and has glossy, leathery, evergreen leaves and showy pink to rose flowers. It contains andromedotoxin, a poison also common to other Kalmia species (including

  • dwarf lemur (primate)

    lemur: Lemur diversity: The dwarf lemurs (Cheirogaleus), along with the mouse (Microcebus), Coquerel’s (Mirza), hairy-eared (Allocebus), and fork-crowned (Phaner) lemurs, make up the family Cheirogaleidae, which in many respects are the most primitive living lemurs. Dwarf lemurs store fat in their tails and are dormant (estivate) during dry periods;…

  • dwarf male (crustacean)

    cirripede: Reproduction and life cycles: …attaching to it becomes a “dwarf” male. When the male occupies a fairly exposed position on its partner, it resembles the juvenile and is capable of feeding. When, through coevolution, males have come to be protected by the partner in one way or another, the dwarf male is variously reduced,…

  • dwarf mistletoe (plant)

    Dwarf mistletoe, any plant that is a member of the genus Arceuthobium (family Viscaceae), which contains about 8 to 15 species of small-flowered plants that are parasitic on coniferous trees. The species are distributed primarily throughout the Northern Hemisphere, though a few tropical species

  • dwarf mongoose (mammal)

    mongoose: …with the smallest being the dwarf mongoose (Helogale parvula), which measures 17–24 cm (7–10 inches) with a 15–20-cm (approximately 6–8-inch) tail. The largest mongoose is the white-tailed mongoose (Ichneumia albicauda), whose body length measures 48–71 cm (about 19–28 inches) long with a tail that may extend up to an additional…

  • dwarf nasturtium (plant)

    nasturtium: minus, the dwarf nasturtium, has flowers 3 cm (1.2 inches) across or less. T. peltophorum, the shield nasturtium, is a climbing plant with orange-red flowers about 2.5 cm (1 inch) long. T. peregrinum is commonly known as the canary creeper.

  • dwarf papyrus (plant)

    papyrus: The dwarf papyrus (C. isocladus, also given as C. papyrus ‘Nanus’), up to 60 cm tall, is sometimes potted and grown indoors.

  • dwarf parrot (bird)

    conure: Among them is the half-moon conure, A. canicularis, called Petz’s conure, or “dwarf parrot”; from Central America, it is 24 cm (about 10 inches) long and mostly green, with orange forehead, dull-blue crown, and blue in the wings. The large (to 50 cm [20 inches]) Patagonian conure, or burrowing…

  • dwarf planet (astronomy)

    Dwarf planet, body, other than a natural satellite (moon), that orbits the Sun and that is, for practical purposes, smaller than the planet Mercury yet large enough for its own gravity to have rounded its shape substantially. The International Astronomical Union (IAU) adopted this category of solar

  • dwarf savory (herb)

    savory: Winter savory, or dwarf savory (S. montana), is a smaller perennial subshrub that flowers in winter. It is used for culinary purposes almost interchangeably with the summer species.

  • dwarf siren (amphibian)

    siren: The dwarf siren (Pseudobranchus striatus) lives in waterways from southern South Carolina to northern Florida, and the narrow-striped dwarf siren (P. axanthus) inhabits similar habitat across peninsular Florida. Adult dwarf sirens are about 10–22 cm (3.9–8.7 inches) long.

  • dwarf spaniel (breed of dog)

    Papillon, breed of toy dog known from the 16th century, when it was called a dwarf spaniel. A fashionable dog, it was favoured by Madame de Pompadour and Marie-Antoinette, and it appeared in paintings by some of the Old Masters. The name papillon (French: “butterfly”) was given to the breed in the

  • dwarf sperm whale (mammal)

    sperm whale: The pygmy and dwarf sperm whales (Kogia breviceps and K. simus) are the only other members of the family Physeteridae. These little-known dolphinlike whales are gray above and white below, and they are quite small—about 2.5 to 4 metres (8 to 13 feet) long. They are distributed worldwide…

  • dwarf star (astronomy)

    Dwarf star, any star of average or low luminosity, mass, and size. Important subclasses of dwarf stars are white dwarfs (see white dwarf star) and red dwarfs. Dwarf stars include so-called main-sequence stars, among which is the Sun. The colour of dwarf stars can range from blue to red, the

  • dwarf sumac (plant)

    sumac: The smaller sumacs are the shining, winged, or dwarf sumac (R. copallinum) and the lemon, or fragrant, sumac (R. aromatica). The former is often grown for its shiny leaves, the leaflets of which are connected by ribs along the axis, and showy reddish fruits. The fragrant sumac has three-parted leaves,…

  • dwarf tapeworm (flatworm)

    cestodiasis: Hymenolepis nana, or dwarf tapeworm, only a few centimetres long, releases eggs that require no intermediate hosts. It is possibly the most common cestode found in humans, affecting chiefly children. Symptoms of intestinal cestodiasis include abdominal pain that may be relieved by eating and that may be associated…

  • dwarf tinamou (bird)

    tinamou: General features: …size from that of the dwarf tinamou (Taoniscus nanus)—about 15 cm (6 inches) long and 150 grams (5 ounces) in weight—to about 50 cm (20 inches) long and 2 kg (4 pounds) in larger species, such as the great tinamou (Tinamus major). The head is small and the bill medium-sized,…

  • dwarf wallaby (marsupial)

    wallaby: The dwarf wallaby is the smallest member of the genus and the smallest known member of the kangaroo family. Its length is about 46 cm (18 inches) from nose to tail, and it weighs about 1.6 kg (3.5 pounds).

  • dwarf yew (plant, Taxus canadensis)

    American yew, (Taxus canadensis), a prostrate, straggling evergreen shrub of the family Taxaceae, found in northeastern North America. American yew also is a lumber trade name for the Pacific yew. The American yew, the hardiest of the yew species, provides excellent ground cover in forested areas.

  • Dwarf, The (novel by Lagerkvist)

    The Dwarf, novel by P?r Lagerkvist, published in Swedish in 1944 as Dv?rgen. Set during the Italian Renaissance and cast in the form of a journal, it is a study of the psychology of evil. The narrator, Piccoline, always referred to as “the Dwarf,” is a minor retainer at the court of an Italian

  • Dwarf, The (Soviet official)

    Nikolay Ivanovich Yezhov, Russian Communist Party official who, while chief of the Soviet security police (NKVD) from 1936 to 1938, administered the most severe stage of the great purges, known as Yezhovshchina (or Ezhovshchina). Nothing is known of his early life (he was nicknamed the “Dwarf”

  • dwarfism (medical condition)

    Dwarfism, condition of growth retardation resulting in abnormally short adult stature and caused by a variety of hereditary and metabolic disorders. Traditionally, the term “dwarf” was used to describe individuals with disproportions of body and limb, while “midget” referred to those of reduced

  • Dwarka (India)

    Dwarka, town, southwestern Gujarat state, west-central India. It lies on the western shore of the Okhamandal Peninsula, a small western extension of the Kathiawar Peninsula. Dwarka was the legendary capital of the god Krishna, who founded it after his flight from Mathura. Its consequent sanctity

  • Dwarkeswar River (river, India)

    Rupnarayan River, river in West Bengal state, northeastern India. It rises as the Dhaleshwari (Dhalkisor) in the Chota Nagpur plateau foothills northeast of the city of Purulia and follows a tortuous southeasterly course past the city of Bankura, where it is known as the Dwarkeswar. It is joined by

  • Dwars (region, India)

    Duars, region of northeastern India, at the foot of the east-central Himalayas. It is divided by the Sankosh River into the Western and Eastern Duars. Both were ceded by Bhutan to the British at the end of the Bhutan War (1864–65). The Eastern Duars, in western Assam state, comprises a level plain

  • Dwb climate (climatology)

    humid continental climate: …the humid continental climate (Dwa, Dwb) occurs. This climate type has a pronounced summer precipitation maximum and a cold, dry winter dominated by continental polar air diverging out of the nearby Siberian anticyclone.

  • dwelling

    architecture: Domestic architecture: Domestic architecture is produced for the social unit: the individual, family, or clan and their dependents, human and animal. It provides shelter and security for the basic physical functions of life and at times also for commercial, industrial, or agricultural activities that involve…

  • Dwellings: A Spiritual History of the Living World (essays by Hogan)

    Linda Hogan: …also wrote the essay collection Dwellings: A Spiritual History of the Living World (1995) and the memoir The Woman Who Watches Over the World (2001).

  • DWI (law)

    alcohol consumption: United States: …the tolerance sometimes found for driving under the influence of alcohol. In response to the large percentage of automobile fatalities involving alcohol consumption—according to some studies alcohol use was present in more than 40 percent of fatal crashes in the United States in the 1980s—and pressure from interest groups (e.g.,…

  • Dwiggins, W. A. (American artist)

    W.A. Dwiggins, American typographer, book designer, puppeteer, illustrator, and calligrapher, who designed four of the most widely used Linotype faces in the United States and Great Britain: Caledonia, Electra, Eldorado, and Metro. After studying with Frederic Goudy in Chicago, Dwiggins moved in

  • Dwiggins, William Addison (American artist)

    W.A. Dwiggins, American typographer, book designer, puppeteer, illustrator, and calligrapher, who designed four of the most widely used Linotype faces in the United States and Great Britain: Caledonia, Electra, Eldorado, and Metro. After studying with Frederic Goudy in Chicago, Dwiggins moved in

  • Dwight D. Eisenhower Lock (lock, Canada)

    canals and inland waterways: Major inland waterways of North America: …another 38 feet by the Dwight D. Eisenhower Lock into Lake St. Lawrence. Leaving the western end of the lake, the seaway bypasses the Iroquois Control Dam and proceeds through the Thousand Islands to Lake Ontario.

  • Dwight D. Eisenhower School for National Security and Resource Strategy (school, United States)

    National Defense University: …(ICAF) in 1946 (becoming the Dwight D. Eisenhower School for National Security and Resource Strategy in 2012), addressed that need.

  • Dwight Mission (mission, Oklahoma, United States)

    Sallisaw: Dwight Mission, 7 miles (11 km) northeast, was founded in 1828 and functioned for more than a century; it was one of the most important educational institutions in Indian Territory before the American Civil War. Sequoyah, who invented the Cherokee syllabary (see Cherokee language), built…

  • Dwight, John (English potter)

    John Dwight, first of the distinguished English potters, producer of works in stoneware. After taking the degree of bachelor of civil law at Christ Church, Oxford, Dwight was appointed registrar and scribe to the diocese of Chester. In 1665 he moved to Wigan and sometime between 1671 and 1674 moved

  • Dwight, Reginald Kenneth (British musician)

    Elton John, British singer, composer, and pianist who was one of the most popular entertainers of the late 20th century. He fused as many strands of popular music and stylistic showmanship as Elvis Presley in a concert and recording career that included the sale of hundreds of millions of records.

  • Dwight, Timothy (American theologian and poet)

    Timothy Dwight, American educator, theologian, and poet who had a strong instructive influence during his time. Educated by his mother, a daughter of the preacher Jonathan Edwards, Dwight entered Yale at age 13 and was graduated in 1769. He then pursued a variety of occupations, including those of

  • Dworkin, Andrea (American activist and author)

    Andrea Dworkin, American feminist and author, an outspoken critic of sexual politics, particularly of the victimizing effects of pornography on women. Dworkin began writing at an early age. During her undergraduate years at Vermont’s Bennington College (B.A., 1968), she became involved with the

  • Dworkin, Gerald (philosopher)

    paternalism: History of paternalism: …the 1971 publication of philosopher Gerald Dworkin’s article on the subject in the book Morality and the Law. As the discourse of paternalism evolved, its meaning became more nuanced. Responding to what he considered intrusively interventionist policy and program changes affecting the poor (e.g., welfare, child support, homelessness), Lawrence Mead…

  • Dworkin, Ronald (American legal philosopher)

    Ronald Myles Dworkin, American legal philosopher (born Dec. 11, 1931, Worcester, Mass.—died Feb. 14, 2013, London, Eng.), was a liberal Democrat who became entrenched in the New Deal policies set forth by Pres. Franklin D. Roosevelt and vigorously defended his own ideals by insisting that law

  • Dworkin, Ronald Myles (American legal philosopher)

    Ronald Myles Dworkin, American legal philosopher (born Dec. 11, 1931, Worcester, Mass.—died Feb. 14, 2013, London, Eng.), was a liberal Democrat who became entrenched in the New Deal policies set forth by Pres. Franklin D. Roosevelt and vigorously defended his own ideals by insisting that law

  • Dwyfor, 1st Earl Lloyd-George of (prime minister of United Kingdom)

    David Lloyd George, British prime minister (1916–22) who dominated the British political scene in the latter part of World War I. He was raised to the peerage in the year of his death. Lloyd George’s father was a Welshman from Pembrokeshire and had become headmaster of an elementary school in

  • Dwyka Series (rock unit, Africa)

    Africa: The Paleozoic Era: …of subequatorial Africa, including the Dwyka tillite, which covers part of South Africa, Namibia, Madagascar, an extensive portion of the Congo Basin, and Gabon. At several places in South Africa, the Dwyka strata are covered by thin marine layers that serve to demarcate the transition from the Carboniferous to the…

  • Dwykaselachus oosthuizeni (fossil fish)

    chimaera: …ago and given the name Dwykaselachus oosthuizeni, which was discovered during the 1980s in the Karoo region of South Africa. Upon first glance, the fossil displayed characteristics similar to a group of unusual extinct sharks from the family Symmoriidae, which are known for their strange dorsal fin spines. However, computerized…

  • DX film system (photography)

    technology of photography: Perforated film: The DX film system employs optical, electrical, and mechanical encoding to transmit to appropriately equipped cameras such information as film type, film speed, and number of exposures. The system also supplies data that enable automatic photofinishing equipment to identify and sort film quickly, simplifying processing and…

  • DX-7 (music synthesizer)

    electronic instrument: Digital synthesizers: …best-known of these was the Yamaha DX-7, which was based on the results of Chowning’s research in FM Synthesis. Introduced in 1983, the DX-7 was polyphonic, had a five-octave touch-sensitive keyboard, and offered a wide choice of timbres, which the player could adjust or change to suit his requirements. Well…

  • DXA scan (medicine)

    bone mineral density: …mineral density test is the dual-energy X-ray absorptiometry (DXA) scan, which employs minimal amounts of radiation and is commonly used for osteoporosis (bone-thinning) screening. Other types of clinical tests that are used to determine bone mineral density include those based on the use of single-photon absorptiometry, dual-photon absorptiometry, ultrasound, and…

  • DXM (drug)

    Dextromethorphan, synthetic drug related to morphine and used in medicine as a cough suppressant. The hydrobromide salt of dextromethorphan occurs as white crystals or a white crystalline powder, soluble in water, alcohol, and chloroform. It acts upon the central nervous system to suppress the

  • Dy (chemical element)

    Dysprosium (Dy), chemical element, a rare-earth metal of the lanthanide series of the periodic table. Dysprosium is a relatively hard metal and is silvery white in its pure form. It is quite stable in air, remaining shiny at room temperature. Dysprosium turnings ignite easily and burn white-hot.

  • dyad, indeterminate (philosophy)

    Speusippus: …called “the One” and “the indeterminate dyad,” terms meant to explain the presence of both unity and multiplicity in the universe. His colleagues, however, viewed “the One” and “the dyad” as principles of good and evil, respectively, but Speusippus denied the attachment of moral qualities. Using numerical labels, he also…

  • dyadic operator (logic)

    formal logic: Basic features of PC: …two arguments are known as dyadic.

  • dyadic predicate (logic)

    formal logic: The predicate calculus: …“John”) and a dyadic or two-place predicate (“is a son of”), of which they are the arguments; and the proposition is thus of the form ?xy. Analogously, “… is between … and …” is a three-place predicate, requiring three arguments, and so on. In general, a predicate variable followed by…

  • dyadic relation (logic and mathematics)

    formal logic: Classification of dyadic relations: Consider the closed wff (?x)(?y)(?xy ? ?yx), which means that, whenever the relation ? holds between one object and a second, it also holds between that second object and the first. This expression is not valid, since it is true for some relations…

  • Dyadya Vanya (play by Chekhov)

    Uncle Vanya, drama in four acts by Anton Chekhov, published in 1897 as Dyadya Vanya and first produced in 1899 in Moscow. Considered one of Chekhov’s theatrical masterpieces, the play is a study of aimlessness and hopelessness. Ivan Voynitsky, called Uncle Vanya, is bitterly disappointed when he

  • Dyagilev, Sergey Pavlovich (Russian ballet impresario)

    Serge Diaghilev, Russian promoter of the arts who revitalized ballet by integrating the ideals of other art forms—music, painting, and drama—with those of the dance. From 1906 he lived in Paris, where in 1909 he founded the Ballets Russes. Thereafter he toured Europe and the Americas with his

  • Dyah Permata Megawati Setiawati Sukarnoputri (president of Indonesia)

    Megawati Sukarnoputri, Indonesian politician who was the fifth president of Indonesia (2001–04) and the first woman to hold the post. The daughter of Sukarno, the first president of Indonesia, Megawati studied psychology and agriculture in college but did not take a degree. In 1987 she entered

  • dyak (Russian social class)

    Russia: Trends in the 17th century: …was the prosperity of the dyak class of professional administrators, which had become a closed hereditary estate by a decree of 1640; this class had become a new and powerful “nobility of the seal” that was to survive into modern times.

  • Dyak (people)

    Dayak, the non-Muslim indigenous peoples of the island of Borneo, most of whom traditionally lived along the banks of the larger rivers. Their languages all belong to the Indonesian branch of the Austronesian (Malayo-Polynesian) language family. Dayak is a generic term that has no precise ethnic or

  • Dyaka (Spain)

    Jaca, city, Huesca provincia (province), in the communidad autónoma (autonomous community) of Aragon, northeastern Spain, on the plateau on the southern bank of the Aragon River, just south of the French border. Of ancient origin, the city was captured by the Romans in 194 bc and surrounded by

  • dyal (bird)

    Dyal, popular species of magpie-robin

  • dyarchy (British India government system)

    Dyarchy, system of double government introduced by the Government of India Act (1919) for the provinces of British India. It marked the first introduction of the democratic principle into the executive branch of the British administration of India. Though much-criticized, it signified a

  • Dyaus (Indian deity)

    Zeus: …that of the sky god Dyaus of the ancient Hindu Rigveda. Zeus was regarded as the sender of thunder and lightning, rain, and winds, and his traditional weapon was the thunderbolt. He was called the father (i.e., the ruler and protector) of both gods and men.

  • dybbuk (Jewish folklore)

    Dybbuk, in Jewish folklore, a disembodied human spirit that, because of former sins, wanders restlessly until it finds a haven in the body of a living person. Belief in such spirits was especially prevalent in 16th–17th-century eastern Europe. Often individuals suffering from nervous or mental

  • Dybbuk, The (play by Ansky)

    The Dybbuk, expressionistic drama in four acts by S. Ansky, performed in 1920 in Yiddish as Der Dibek and published the following year. Originally titled Tsvishn Tsvey Veltn (“Between Two Worlds”), the play was based on the mystical concept from ?asidic Jewish folklore of the dybbuk, a disembodied

  • Dybowski’s sika (mammal)

    sika: …the northern sikas, such as Dybowski’s sika (C. nippon hortulorum), stand approximately 110 cm (40 inches) at the shoulder and weigh 110 kg (240 pounds). Females weigh about 60 percent as much as males. Their coats are reddish brown and spotted in summer and dark brown and sometimes without spots…

  • Dybwad, Gunnar (American author, administrator, and activist)

    Gunnar Dybwad, German-born American author, administrator, and activist who championed the civil rights of the developmentally disabled and was an early proponent of self-advocacy. In 1934 Dybwad received a doctorate in law from the University of Halle. Shortly thereafter he left Germany and moved

  • Dybwad, Rosemary F. (American author and activist)

    Rosemary F. Dybwad, American author and advocate for the developmentally disabled. She was the daughter of a missionary, and she spent her teen years in Manila. She then attended Western College for Women (now part of Miami University) in Oxford, Ohio. After being awarded a two-year fellowship

  • Dybwad, Rosemary Ferguson (American author and activist)

    Rosemary F. Dybwad, American author and advocate for the developmentally disabled. She was the daughter of a missionary, and she spent her teen years in Manila. She then attended Western College for Women (now part of Miami University) in Oxford, Ohio. After being awarded a two-year fellowship

  • Dyce, Alexander (Scottish editor)

    Alexander Dyce, Scottish editor whose works, characterized by scrupulous care and integrity, contributed to the growing interest in William Shakespeare and his contemporaries during the 19th century. As an undergraduate at the University of Oxford, Dyce edited a dictionary of the language of

  • Dyce, William (British artist)

    William Dyce, Scottish painter and pioneer of state art education in Great Britain. Dyce studied at the Royal Scottish Academy, Edinburgh, and the Royal Academy schools, London. One of the first British students of early Italian Renaissance painting, he visited Italy in 1825 and 1827–28, meeting in

  • Dyckia (plant genus)

    Dyckia, genus of usually stemless plants of the pineapple family (Bromeliaceae), consisting of about 80 South American species. These plants’ long, stiff leaves, which grow in dense rosettes, are spiny-edged, sharp-tipped, and often fleshy. The small flowers usually are yellow or orange. Two

  • Dyckia brevifolia (plant)

    Dyckia: rariflora and D. sulphurea (D. brevifolia), are commonly cultivated indoors as decorative plants. The leaves of both species are about 10–20 cm (about 4–8 inches) long and less than 0.8 cm ( 13 inch) wide. The flowers of D. rariflora are in a nearly stalkless cluster about…

  • Dyckia rariflora (plant)

    Dyckia: Two species, D. rariflora and D. sulphurea (D. brevifolia), are commonly cultivated indoors as decorative plants. The leaves of both species are about 10–20 cm (about 4–8 inches) long and less than 0.8 cm ( 13 inch) wide. The flowers of D. rariflora are in a nearly…

  • Dyckia sulphurea (plant)

    Dyckia: rariflora and D. sulphurea (D. brevifolia), are commonly cultivated indoors as decorative plants. The leaves of both species are about 10–20 cm (about 4–8 inches) long and less than 0.8 cm ( 13 inch) wide. The flowers of D. rariflora are in a nearly stalkless cluster about…

  • Dycril (polymer)

    printing: Preparing stereotypes and plates: …better known examples are nylon, Dycril, and KRP. Nylon is sensitized in bulk by immersion in a solution of acetone containing the sensitizing agent. The plate is exposed to ultraviolet light, and the nonprinting areas are dissolved by a bath of methyl and ethyl alcohol. It takes 24 hours for…

  • Dydek, Malgorzata (Polish-born basketball player and coach)

    Margo Dydek, (Malgorzata Dydek; “Large Marge”), Polish-born basketball player and coach (born April 28, 1974, Warsaw, Pol.—died May 27, 2011, Brisbane, Australia), was the WNBA’s tallest active player ever at 2.18 m (7 ft 2 in) and 105.7 kg (233 lb). She began her basketball career in Poland with

  • Dydek, Margo (Polish-born basketball player and coach)

    Margo Dydek, (Malgorzata Dydek; “Large Marge”), Polish-born basketball player and coach (born April 28, 1974, Warsaw, Pol.—died May 27, 2011, Brisbane, Australia), was the WNBA’s tallest active player ever at 2.18 m (7 ft 2 in) and 105.7 kg (233 lb). She began her basketball career in Poland with

  • dye

    Dye, substance used to impart colour to textiles, paper, leather, and other materials such that the colouring is not readily altered by washing, heat, light, or other factors to which the material is likely to be exposed. Dyes differ from pigments, which are finely ground solids dispersed in a

  • dye coupler (chemistry)

    motion-picture technology: Film: The substance is called a dye coupler. Since the dye is not soluble, it does not wash off in the subsequent film treatment.

  • dye laser (instrument)

    laser: Types of lasers: In dye lasers the laser medium is a liquid containing organic dye molecules that can emit light over a range of wavelengths; adjusting the laser cavity changes, or tunes, the output wavelength. Chemical lasers are gas lasers in which a chemical reaction generates the excited molecules…

  • dye murex (marine snail)

    murex: The dye murex (Murex brandaris) of the Mediterranean was once a source of royal Tyrian purple. Another member of this important genus is the 15-cm (6-inch) Venus comb (M. pecten), a white long-spined species of the Indo-Pacific region. Other members of the Muricidae include modestly ornamented…

  • dye-destruction process (photography)

    technology of photography: Dye-destruction processes: Dye-destruction processes differ from chromogenic colour materials (where colour images are produced during development) in starting off with emulsion layers containing the final dyes. During processing these are bleached in proportion to the silver image formed. Straightforward processing of a dye-destruction or dye-bleach…

  • dye-line process (technology)

    photocopying machine: …techniques, notably the diffusion-transfer and dye-line processes, during the early 1950s. In the diffusion-transfer process a master copy is made on a translucent sheet, which is placed on light-sensitized negative paper and exposed to light. The negative is then placed in contact with a sheet of positive transfer paper and…

  • dye-transfer process (photography)

    Dye-transfer process, in photography, technique for preparing coloured photographic prints in which the colours of the subject are resolved by optical filters into three components, each of which is recorded on a separate gelatin negative. The three negatives are converted into relief positives in

  • dyeing

    Dye, substance used to impart colour to textiles, paper, leather, and other materials such that the colouring is not readily altered by washing, heat, light, or other factors to which the material is likely to be exposed. Dyes differ from pigments, which are finely ground solids dispersed in a

  • dyeline process (chemical process)

    technology of photography: Diazonium processes: A diazo, or dyeline, process depends on the decomposition by light of organic diazonium salts. These salts can also couple with certain other compounds to form dyes. After exposure only the exposed (and decomposed) diazonium salt forms dye, producing a positive image from…

  • dyer’s alkanet (plant)

    alkanet: …closely related Alkanna tinctoria is dyer’s alkanet. Its roots yield a water-insoluble red dye used to colour fat, oil, perfume, wood, marble, and pharmaceutical products.

  • dyer’s madder (plant)

    Madder, (genus Rubia), genus of about 80 species of perennial plants in the madder family (Rubiaceae), several of which were once commonly used as a source of dye. Madder species are distributed throughout the Mediterranean region, Asia, Africa, and the Americas. The plants are generally

  • dyer’s woad (plant)

    Woad, (Isatis tinctoria), biennial or perennial herb in the mustard family (Brassicaceae), formerly grown as a source of the blue dye indigo. A summer-flowering plant native to Eurasia, woad is sometimes cultivated for its attractive flowers and has naturalized in parts of North America, where it

  • Dyer, Jack (Australian athlete)

    Jack Dyer, Australian rules football player renowned for his toughness. One of the game’s greatest players, he was credited with perfecting the drop punt kick (dropping the ball and kicking it before it touches the ground), heralding the demise of the drop kick and stab pass (two types of kicks

  • Dyer, John (British poet)

    John Dyer, British poet chiefly remembered for “Grongar Hill” (1726), a short descriptive and meditative poem, in the manner of Alexander Pope’s “Windsor-Forest,” in which he portrays the countryside largely in terms of classical landscape. The poet describes the view from a hill overlooking the

  • Dyer, John Raymond (Australian athlete)

    Jack Dyer, Australian rules football player renowned for his toughness. One of the game’s greatest players, he was credited with perfecting the drop punt kick (dropping the ball and kicking it before it touches the ground), heralding the demise of the drop kick and stab pass (two types of kicks

  • Dyer, Mary Barrett (Quaker martyr)

    Mary Barrett Dyer, British-born religious figure whose martyrdom to her Quaker faith helped relieve the persecution of that group in the Massachusetts Bay Colony. Married in 1633 in London to William Dyer, Mary Dyer went with him to America (c. 1635) and settled in Boston. She began to accept the

  • Dyer, Reginald (British general)

    Reginald Dyer, British general remembered for his role in the Massacre of Amritsar in India, in 1919. Dyer was commissioned in the West Surrey Regiment in 1885 and subsequently transferred to the Indian Army. He campaigned in Burma (Myanmar) in 1886–87 and took part in a blockade of Waziristan (now

  • Dyer, Reginald Edward Harry (British general)

    Reginald Dyer, British general remembered for his role in the Massacre of Amritsar in India, in 1919. Dyer was commissioned in the West Surrey Regiment in 1885 and subsequently transferred to the Indian Army. He campaigned in Burma (Myanmar) in 1886–87 and took part in a blockade of Waziristan (now

  • Dyer, Sir Edward (English poet)

    Sir Edward Dyer, English courtier and poet whose reputation rests on a small number of ascribed lyrics in which critics have found great dexterity and sweetness. Educated at the University of Oxford, Dyer went to court under the patronage of the Earl of Leicester. Dyer was a friend of Sir Philip

  • Dyer, Sir James (English jurist)

    Sir James Dyer, chief justice of the English Court of Common Pleas from 1559, who originated the modern system of reporting law cases to serve as precedents. His method superseded the recording of cases in yearbooks (begun in 1292), which were not intended as guides for future decisions. Dyer’s

  • Dyer-Bennet, Richard (American musician)

    Richard Dyer-Bennet, British-born American tenor and guitarist who helped to revive the popularity of folk music through his concert performances, recordings, compositions, and teaching. Though born in England, Dyer-Bennet grew up in Canada and California and attended the University of California

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