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  • endoscope (surgical imaging device)

    cancer: Diagnostic procedures: …the physician can use an endoscope to inspect the internal cavities and hollow viscera. An endoscope is a flexible optical instrument that makes it possible not only to observe the appearance of the internal linings but also to perform a biopsy, a procedure used to procure a tissue sample from…

  • endoscopic retrograde cholangiopancreatoscopy (medicine)

    Endoscopic retrograde cholangiopancreatoscopy, medical procedure in which a flexible fibre-optic scope is used to examine the bile duct and pancreatic ducts for the presence of gallstones, tumours, or inflammation. In this procedure an endoscope is passed through the stomach into the duodenum to

  • endoscopic ultrasonic disintegration (medicine)

    ultrasonics: Therapy and surgery: …of kidney stones, known as endoscopic ultrasonic disintegration, uses a small metal rod inserted through the skin to deliver ultrasound in the 22- to 30-kilohertz frequency region.

  • endoscopy (medical procedure)

    Endoscopy, medical examination of the interior of the body, usually through a natural body opening, by the insertion of a flexible, lighted optical shaft or open tube. Instruments used include the endoscope, a flexible tube for examination of the esophagus, stomach, and duodenum, and the

  • endosome (biology)

    virus: The cycle of infection: …coated vesicle fuses with cytoplasmic endosomes (membrane-enclosed vesicles) and then with cell organelles called lysosomes, which are membrane-enclosed vesicles containing enzymes. In an acidic environment, the membrane of an enveloped virus fuses with the endosome membrane, and the viral nucleocapsid is released into the cytoplasm. Nonenveloped viruses presumably undergo a…

  • endosperm (plant tissue)

    Endosperm, tissue that surrounds and nourishes the embryo in the seeds of angiosperms (flowering plants). In some seeds the endosperm is completely absorbed at maturity (e.g., pea and bean), and the fleshy food-storing cotyledons nourish the embryo as it germinates. In others, some of the endosperm

  • endospore (biology)

    Ferdinand Cohn: …and germination of spores (called endospores) in certain bacteria, particularly in Bacillus subtilis. He was also the first to note endospores’ resistance to high temperatures, and by his observations he was able to refute contemporary experiments that seemed to lend support to the theory of spontaneous generation. Cohn explained the…

  • endosternite (anatomy)

    arachnid: Support, skeleton, and exoskeleton: …hard internal structure called the endosternite, which anchors muscles.

  • endostyle (anatomy)

    amphioxus: The endostyle corresponds to the thyroid in vertebrates, since it seems to produce iodinated, tyrosine molecules, which may function as regulatory substances, much like hormones, in amphioxi.

  • endosurgery (medicine)

    therapeutics: Minimally invasive surgery: Traditional open surgical techniques are being replaced by new technology in which a small incision is made and a rigid or flexible endoscope is inserted, enabling internal video imaging. Endoscopic procedures (endoscopy) are commonly performed on nasal sinuses, intervertebral disks, fallopian tubes,…

  • endosymbiont (biology)

    algae: Distribution and abundance: …general sense these are called endosymbionts. Specifically, endozoic endosymbionts live in protozoa or animals such as shelled gastropods, whereas endophytic endosymbionts live in fungi, plants, or other algae.

  • endosymbiont hypothesis (biochemistry)

    cell: The endosymbiont hypothesis: Mitochondria and chloroplasts are self-dividing; they contain their own DNA and protein-synthesizing machinery, similar to that of prokaryotes. Chloroplasts produce ATP and trap photons by mechanisms that are complex and yet similar to those of certain prokaryotes. These phenomena have led to the…

  • endosymbiosis (biology)

    algae: Distribution and abundance: …general sense these are called endosymbionts. Specifically, endozoic endosymbionts live in protozoa or animals such as shelled gastropods, whereas endophytic endosymbionts live in fungi, plants, or other algae.

  • endothelium (anatomy)

    arteriosclerosis: …of a blood vessel (the endothelium of the intimal layer) becomes injured. Some factors that cause mechanical damage to the endothelium are high cholesterol and triglycerides (a type of lipid, or fat), high blood pressure, and tobacco smoke. People who have an abnormally large amount of cholesterol or other lipids…

  • endothelium-derived relaxing factor (chemical compound)

    Robert F. Furchgott: The molecule, which he named endothelium-derived relaxing factor (EDRF), signals smooth muscle cells in blood vessel walls to relax, dilating the vessels. Furchgott’s work would eventually be linked with research done by Murad in 1977, which showed that nitroglycerin and several related heart drugs induce the formation of nitric oxide,…

  • endotherm (biology)

    Endotherm, so-called warm-blooded animals; that is, those that maintain a constant body temperature independent of the environment. The endotherms primarily include the birds and mammals; however, some fish are also endothermic. If heat loss exceeds heat generation, metabolism increases to make up

  • endothermic reaction (chemical reaction)

    chemical reaction: Energy considerations: The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved. The more general terms exoergic (energy evolved) and endoergic (energy required) are used when forms of energy other than heat are involved.

  • endothermic solution (chemistry)

    liquid: Endothermic and exothermic solutions: When two substances mix to form a solution, heat is either evolved (an exothermic process) or absorbed (an endothermic process); only in the special case of an ideal solution do substances mix without any heat effect. Most simple molecules mix with…

  • endothermy (physiology)

    dinosaur: Ectothermy and endothermy: All animals thermoregulate. The internal environment of the body is under the influence of both external and internal conditions. Land animals thermoregulate in several ways. They do so behaviorally, by moving to a colder or warmer place, by exercising to generate body heat, or…

  • Endothia parasitica (fungus species)

    Ascomycota: chestnut blight (Cryphonectria parasitica), and apple scab (Venturia inequalis). Perhaps the most indispensable fungus of all is an ascomycete, the common yeast (Saccharomyces cerevisiae), whose varieties leaven the dough in bread making and ferment grain to produce beer or mash for distillation of alcoholic liquors; the

  • Endothyra (fossil protozoan genus)

    Endothyra, extinct genus of Foraminifera, protozoans with a readily preservable shell; found as fossils in Devonian to Triassic marine rocks (between 416 million and about 200 million years old). Endothyra, characterized by a tightly coiled shell, is sometimes found in very large numbers; it is

  • endotoxin (bacterial toxin)

    Endotoxin, toxic substance bound to the bacterial cell wall and released when the bacterium ruptures or disintegrates. Endotoxins consist of lipopolysaccharide and lipoprotein complexes. The protein component determines its foreign (antigenic) nature; the polysaccharide component determines the

  • endotrophic mycorrhiza (biology)

    conifer: Roots: …species have vesicular-arbuscular mycorrhizae, called endomycorrhizae because the fungal hyphae actually penetrate the cells of the roots. All of the Pinaceae, and only the Pinaceae, have the other kind of root symbiosis, called ectomycorrhizal because the fungi sheath the rootlets and hyphae pass between the outer root cells without penetrating…

  • endowment (religion)

    Church of Jesus Christ of Latter-day Saints: Institutions and practices: Baptism for the dead, endowment (a rite of adult initiation in which blessings and knowledge are imparted to the initiate), and the sealing of husbands, wives, and children (which may also be undertaken by proxy for the dead) are essential ceremonies that take place in the temple. During the…

  • endowment versus environment (psychology)

    heredity: Heredity and environment: A notion that was widespread among pioneer biologists in the 18th century was that the fetus, and hence the adult organism that develops from it, is preformed in the sex cells. Some early microscopists even imagined that they saw…

  • endozoochory (seed dispersal)

    seed: Agents of dispersal: …carried can be emphasized, distinguishing endozoochory, seeds or diaspores carried within an animal; epizoochory, seeds or diaspores accidentally carried on the outside; and synzoochory, seeds or diaspores intentionally carried, mostly in the mouth, as in birds and ants.

  • Endpoint, and Other Poems (work by Updike)

    John Updike: Endpoint, and Other Poems, published posthumously in 2009, collects poetry Updike had written between 2002 and a few weeks before he died; it takes his own death as its primary subject. Selected Poems (2015) broadly surveys his poetic career. Higher Gossip, a collection of commentaries,…

  • Endre I (king of Hungary)

    Hungary: The early kings: …followed on the throne by Andrew (Endre) I, of a collateral branch of the house of árpád, who was killed in 1060 while fleeing from a battle lost to his brother, Béla I. After Béla’s death there was a further conflict between his sons, Géza and Ladislas (László), and Andrew’s…

  • endrin (chemical compound)

    Aldrin (C12H8Cl6), one of the several isomers (compounds with the same composition but different structures) of hexachlorohexahydrodimethanonaphthalene, a chlorinated hydrocarbon formerly used as an insecticide. Aldrin was first prepared in the late 1940s and is manufactured by the reaction of

  • ends-means chain (social science)

    decision making: Satisficing and bounded rationality: …missions through what Simon called ends-means chains. Leaders set the organizational mission, find a set of means for achieving the mission, take each of those means as a subgoal, and then find means for the subgoals and so on, until goals exist for every member of the organization. Leaders thus…

  • Endurance (British ship)

    Ernest Shackleton: …Pole, but the expedition ship Endurance was trapped in ice off the Caird coast and drifted for 10 months before being crushed in the pack ice. The members of the expedition then drifted on ice floes for another five months and finally escaped in boats to Elephant Island in the…

  • endurance-running hypothesis (evolution)

    Daniel Lieberman: …Lieberman and Bramble outlined the endurance-running hypothesis, which states that the ability of humans to run long distances is an adaptation that originated approximately two million years ago with the emergence of the genus Homo. They noted that several features that facilitate endurance running first appeared in H. habilis and…

  • Enduring Legacy of Jane Austen, The

    Jan. 28, 2013, marked the 200th anniversary of the publication of Jane Austen’s best-loved Novel, Pride and Prejudice, and two centuries after the novel’s appearance, the many fans of Elizabeth Bennet and Mr. Darcy—and of Austen herself—were poised to party in a yearlong celebration. The media, the

  • Endy, Drew (American bioengineer)

    synthetic biology: BioBricks and xeno-nucleic acids: …synthetic biology was American bioengineer Drew Endy, who founded the nonprofit BioBricks Foundation. Endy was developing a catalogue of information needed to synthesize basic biological parts, or “bricks,” from DNA and other molecules. Other scientists and engineers were able to use this information to build whatever biological products they wanted,…

  • Endymion (Greek mythology)

    Endymion, in Greek mythology, a beautiful youth who spent much of his life in perpetual sleep. Endymion’s parentage varies among the different ancient references and stories, but several traditions say that he was originally the king of Elis. According to one tradition, Zeus offered him anything

  • Endymion (poem by Keats)

    John Keats: Early works: …Canterbury and began work on Endymion, his first long poem. On his return to London he moved into lodgings in Hampstead with his brothers. Endymion appeared in 1818. This work is divided into four 1,000-line sections, and its verse is composed in loose rhymed couplets. The poem narrates a version…

  • Endymion (novel by Disraeli)

    Benjamin Disraeli: Second administration: …his party leadership and finished Endymion (3 vol., 1880), a mellow, nostalgic political novel viewing his early career. His health failed rapidly, and, a few days after his burial in the family vault at Hughenden, Queen Victoria came to lay a wreath upon the tomb of her favourite prime minister.

  • Endymion nonscriptus (plant)

    bluebell: …clusters of English bluebell, or wild hyacinth (Hyacinthoides non-scripta), and Spanish bluebell (H. hispanica) are borne on plants about 30 cm (1 foot) tall. Both species are cultivated as garden ornamentals.

  • Enebish, Lhamsurengiyn (Mongolian politician)

    Lhamsurengiyn Enebish, Mongolian politician (born 1947, Mogod Sum, Mong.—died Sept. 29, 2001, Ulaanbaatar, Mong.), was secretary-general (from 1996) of the Mongolian People’s Revolutionary Party (MPRP) and speaker (from July 19, 2000) of the country’s Great Hural (parliament). Enebish studied e

  • Enée racontant à Didon les malheurs de la ville de Troie (painting by Guérin)

    Pierre-Narcisse, Baron Guérin: …for colour and atmosphere, is Enée racontant à Didon les malheurs de la ville de Troie (1817). He was director of the Académie de France in Rome from 1822 to 1828.

  • Enegir (ancient city, Iraq)

    Ninazu: …deity, the city god of Enegir, which was located on the Euphrates River between Larsa and Ur in the southern orchard region. Ninazu was also the city god of Eshnunna (modern Tall al-Asmar in eastern Iraq). Ninazu, whose name means “Water Knower,” was primarily an underworld deity, although the exact…

  • Eneide (work by Heinrich von Veldeke)

    Heinrich von Veldeke: …of Thuringia, Heinrich completed the Eneit, modeled on the French Roman d’Eneas rather than directly on Virgil’s Aeneid. Eneit was written not in Heinrich’s native Flemish but in the Franconian literary language of such works as Eilhart von Oberg’s Tristrant und Isalde. Following its French example, Eneit greatly expands the…

  • Eneit (work by Heinrich von Veldeke)

    Heinrich von Veldeke: …of Thuringia, Heinrich completed the Eneit, modeled on the French Roman d’Eneas rather than directly on Virgil’s Aeneid. Eneit was written not in Heinrich’s native Flemish but in the Franconian literary language of such works as Eilhart von Oberg’s Tristrant und Isalde. Following its French example, Eneit greatly expands the…

  • ENEL (Italian corporation)

    Endesa: …and the Italian energy company Enel. Two years later Enel purchased Acciona’s stake, thereby taking full control of Endesa.

  • enema (medical procedure)

    nutritional disease: Bowel conditions and diseases: Although laxatives or enemas may be helpful, frequent use may upset fluid, mineral, and electrolyte (salt) balances and interfere with vitamin absorption. Any persistent change in bowel habits should be evaluated by a physician.

  • Enemies: A Love Story (film by Mazursky [1989])

    Paul Mazursky: Films of the 1980s: Mazursky next made Enemies, A Love Story (1989), an adaptation of Isaac Bashevis Singer’s novel about a Holocaust survivor (Ron Silver) who is living in New York City with his wife (Margaret Sophie Stein) while also having an affair with a married woman (Lena Olin). The situation becomes…

  • Enemigo rumor (work by Lezama Lima)

    José Lezama Lima: Enemigo rumor (1941; “Hostile Murmurs,” or “Enemy Rumour”) reveals, in addition to aesthetic preoccupations about the essence of poetry, the poet’s belief that the act of creation is laden with religious and metaphysical possibilities. In Aventuras sigilosas (1945; “Surreptitious Adventures”), he recreates incidents of his…

  • Enemy (work by Maugham)

    Robin Maugham: …is about homosexuals: a play, Enemy (1970), which brings a British and a German soldier into confrontation alone in the desert, charts their doomed friendship; and The Last Encounter (1972), which portrays Charles George (“Chinese”) Gordon of Khartoum as a man as unsure of his destiny as of his sexual…

  • enemy alien (law)

    Johnson v. Eisentrager: …ruled in 1950 that nonresident enemy aliens do not have the legal right to petition U.S. courts for writs of habeas corpus—a prisoner’s petition requesting that the court determine the legality of his or her incarceration. This landmark Supreme Court case was reexamined in 2008 in light of the detention…

  • enemy combatant

    Enemy combatant, extraordinary legal status developed by the administration of Pres. George W. Bush (2001–09) that permitted U.S. military authorities to detain indefinitely and without charge individuals so designated and to deny them other rights and protections afforded under the international

  • Enemy Gods, The (novel by La Farge)

    Oliver La Farge: …set in Central America, while The Enemy Gods (1937) centres on the inability of the Navajo to adapt to white civilization. Long Pennant (1933) and The Copper Pot (1942) have New Englanders as their main characters. La Farge’s short stories were collected in All the Young Men (1935) and A…

  • Enemy of the People, An (American film)

    Steve McQueen: …of Henrik Ibsen’s stage play An Enemy of the People (1977), a drama about a scientist’s efforts to expose his community’s polluted water system. The film was decidedly a labour of love for the actor, but it was poorly received and barely released theatrically. In 1980 McQueen twice played a…

  • Enemy of the People, An (play by Ibsen)

    An Enemy of the People, five-act drama by Henrik Ibsen, published in 1882 as En folkefiende and performed in 1883. An Enemy of the People concerns the actions of Doctor Thomas Stockmann, a medical officer charged with inspecting the public baths on which the prosperity of his native town depends.

  • Enemy of the Stars (play by Lewis)

    English literature: Anglo-American Modernism: Pound, Lewis, Lawrence, and Eliot: His experimental play Enemy of the Stars, published in Blast in 1914, and his experimental novel Tarr (1918) can still surprise with their violent exuberance.

  • Enemy of the State (film by Scott [1998])

    Gene Hackman: …films included Get Shorty (1995), Enemy of the State (1998), The Royal Tennenbaums (2001), and Runaway Jury (2003).

  • Eneolithic Period

    Copper Age, early phase of the Bronze Age

  • Energetic-Synergetic geometry (geometry)

    R. Buckminster Fuller: Life: …geometry that he called “Energetic-Synergetic geometry.” The basic unit of this system is the tetrahedron (a pyramid shape with four sides, including the base), which, in combination with octahedrons (eight-sided shapes), forms the most economic space-filling structures. The architectural consequence of the use of this geometry by Fuller was…

  • energetics (philosophy)

    Wilhelm Ostwald: Other notable activities: …world that he named “energetics.” Second, he asserted a form of positivism in the sense of rejecting theoretical concepts that are not strictly founded on empirical grounds. Although energetics found few adherents, the latter position found many contemporary proponents, such as the physicist-philosophers Ernst Mach in Austria and Pierre…

  • Energia (Russian company)

    Energia, Russian aerospace company that is a major producer of spacecraft, launch vehicles, rocket stages, and missiles. It built the world’s first intercontinental ballistic missile and the first artificial satellite, Sputnik, and pioneered the development and operation of Soviet space stations

  • Energia (Soviet launch vehicle)

    Energia, Soviet heavy-lift launch vehicle. In 1976 approval was given for development of Energia (named for the design bureau that developed it) and its primary mission, the space shuttle Buran. Energia could lift 100,000 kg (220,000 pounds) to low Earth orbit, slightly more than the American

  • energid (biology)

    reproduction: Multiple fission: …metabolism, which he called an energid. Cell reproduction, therefore, might be considered a special case of energid reproduction.

  • energy (physics)

    Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another. After it has been transferred, energy is always

  • Energy and Climate Change Policy, Office of (United States government agency)
  • energy band (physics)

    Band theory, in solid-state physics, theoretical model describing the states of electrons, in solid materials, that can have values of energy only within certain specific ranges. The behaviour of an electron in a solid (and hence its energy) is related to the behaviour of all other particles around

  • energy budget (atmospheric science)

    climate: The biosphere and Earth’s energy budget: Biogenic gases in the atmosphere play a role in the dynamics of Earth’s planetary radiation budget, the thermodynamics of the planet’s moist atmosphere, and, indirectly, the mechanics of the fluid flows that are Earth’s planetary wind systems. In addition, human cultural and economic…

  • energy cogeneration (power)

    Cogeneration, in power systems, use of steam for both power generation and heating. High-temperature, high-pressure steam from a boiler and superheater first passes through a turbine to produce power (see steam engine). It then exhausts at a temperature and pressure suitable for heating purposes,

  • energy consumption

    United Arab Emirates: Resources and power: …highest per capita rates of energy consumption. Despite its large hydrocarbon reserves, rapidly increasing domestic demand driven by population growth and industrialization in the first decade of the 21st century forced the emirates to import natural gas and to draw upon petroleum reserves at a fraction of the export price.

  • energy conversion (technology)

    Energy conversion, the transformation of energy from forms provided by nature to forms that can be used by humans. Over the centuries a wide array of devices and systems has been developed for this purpose. Some of these energy converters are quite simple. The early windmills, for example,

  • energy density (physics)

    magnetism: Magnetization effects in matter: The energy density in a magnetic field is given in the absence of matter by 12B2/μ0; it is measured in units of joules per cubic metre. The total magnetic energy can be obtained by integrating the energy density over all space. The direction of the magnetic…

  • energy drink (beverage)

    Energy drink, any beverage that contains high levels of a stimulant ingredient, usually caffeine, as well as sugar and often supplements, such as vitamins or carnitine, and that is promoted as a product capable of enhancing mental alertness and physical performance. Energy drinks are distinguished

  • energy flow (biology)

    biosphere: The flow of energy: Life on Earth depends on the harnessing of solar energy by the process of photosynthesis. Photosynthetic plants convert solar energy into the chemical energy of living tissue, and that stored chemical energy flows into herbivores, predators, parasites,

  • energy gap (physics)

    Band gap, in solid-state physics, a range of energy levels within a given crystal that are impossible for an electron to possess. Generally, a material will have several band gaps throughout its band structure (the continuum of allowed and forbidden electron energy levels), with large band gaps

  • Energy Independence and Security Act (United States legislation)

    biofuel: Economic and environmental considerations: In the United States the Energy Independence and Security Act of 2007 mandated the use of 136 billion litres (36 billion gallons) of biofuels annually by 2022, more than a sixfold increase over 2006 production levels. The legislation also requires, with certain stipulations, that 79 billion litres (21 billion gallons)…

  • Energy Information Administration (United States service agency)

    nuclear power: World nuclear power: The Energy Information Administration (EIA), a statistical arm of the U.S. Department of Energy, has projected that world electricity generation between 2005 and 2035 will roughly double (from more than 15,000 terawatt-hours to 35,000 terawatt-hours) and that generation from all energy sources except petroleum will continue…

  • energy intelligence (military)

    intelligence: Energy: Energy intelligence specifically addresses the location and size of foreign energy resources; how these resources are used and allocated; foreign governments’ energy policies, plans, and programs; new or improved foreign energy technologies; and the economic and security aspects of foreign energy supply, demand, production, distribution,…

  • energy level (atomic physics)

    Energy state, in physics, any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus. A particular hydrogen atom, for example, may exist in any of several configurations, e

  • Energy Policy Act (United States [2005])

    microgeneration: Net metering: …United States, under the 2005 Energy Policy Act, all public electric utilities are required to make net metering available to customers on request. The process of net metering credits the bills of nonutility net energy producers when they add electricity to the grid, which reduces the amount they pay for…

  • energy pyramid (ecology)

    Trophic pyramid, the basic structure of interaction in all biological communities characterized by the manner in which food energy is passed from one trophic level to the next along the food chain. The base of the pyramid is composed of species called autotrophs, the primary producers of the

  • Energy Reorganization Act (United States [1974])

    Atomic Energy Commission: government under the Energy Reorganization Act of 1974 disbanded the AEC and divided its functions between two new agencies: the Nuclear Regulatory Commission (q.v.), which regulates the nuclear-power industry; and the Energy Research and Development Administration, which was disbanded in 1977 when the Department of Energy was created.…

  • energy resolution (physics)

    radiation measurement: Scintillators: One consequence is that the energy resolution of scintillators is rather poor owing to the statistical fluctuations in the number of carriers actually obtained. For example, the best energy resolution from a scintillator for 0.662 MeV gamma rays (a common standard) is about 5 to 6 percent. By comparison, the…

  • energy source (physics)

    geology: Oil and natural gas: …yet make them attractive alternative energy resources.

  • Energy Star (United States government program)

    Environmental Protection Agency: …Policy Act (1982) and the Energy Star program (1992); the latter was implemented to rate the usage costs and energy efficiency of household appliances and other electronic devices. This period also saw the development of the Emergency Planning and Community Right-to-Know Act (EPCRA), which allowed local communities to know the…

  • energy state (atomic physics)

    Energy state, in physics, any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus. A particular hydrogen atom, for example, may exist in any of several configurations, e

  • energy transfer (biology)

    biosphere: The flow of energy: Life on Earth depends on the harnessing of solar energy by the process of photosynthesis. Photosynthetic plants convert solar energy into the chemical energy of living tissue, and that stored chemical energy flows into herbivores, predators, parasites,

  • energy transfer (atomic physics)

    electron tube: Energy transfer: The fundamental importance of a large class of electronic devices lies in their ability to amplify power. This power amplification results from the conversion of the energy stored in an external power supply to an output energy in the load circuit of the…

  • Energy Warfare

    News about energy warfare was plentiful in 2014, but the event that captured centre stage was Russia’s manipulation of Ukraine’s access to Natural gas. After months of popular protest, Ukraine’s pro-Russian Pres. Viktor Yanukovych was deposed in February 2014. The pro-Western Petro Poroshenko was

  • energy, conservation of (physics)

    Conservation of energy, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy, or energy of motion. In certain particle collisions, called elastic, the sum of the

  • energy, disintegration (nuclear physics)

    radiation measurement: Modes of operation: …a certain amount of charge Q as a result of depositing its energy in the detector material. For example, in a gas, Q represents the total positive charge carried by the many positive ions that are produced along the track of the particle. (An equal charge of opposite sign is…

  • energy, equipartition of (physics)

    Equipartition of energy, law of statistical mechanics stating that, in a system in thermal equilibrium, on the average, an equal amount of energy will be associated with each independent energy state. Based on the work of physicists James Clerk Maxwell of Scotland and Ludwig Boltzmann of Germany,

  • Energy, U.S. Department of (United States government)

    U.S. Department of Energy, executive division of the U.S. federal government responsible for administering national energy policy. Established in 1977, it promotes energy efficiency and the use of renewable energy. Its national security programs serve to develop and oversee nuclear-energy

  • energy-absorbing steering column

    automobile: Safety systems: Interior-impact energy-absorbing devices augment restraint systems by absorbing energy from the occupant while minimizing injuries. The energy-absorbing steering column, introduced in 1967, is a good example of such a device. Instrument panels, windshield glass, and other surfaces that may be struck by an unrestrained occupant may…

  • Enesco, George (Romanian musician and composer)

    George Enesco, Romanian violinist and composer, known for his interpretations of Bach and his eclectic compositions. At age seven Enesco went to the Vienna Conservatory, where he studied violin. In 1894 he became acquainted with Johannes Brahms, whose formal symphonic developments he later took as

  • Enescu, Georges (Romanian musician and composer)

    George Enesco, Romanian violinist and composer, known for his interpretations of Bach and his eclectic compositions. At age seven Enesco went to the Vienna Conservatory, where he studied violin. In 1894 he became acquainted with Johannes Brahms, whose formal symphonic developments he later took as

  • Enet’-enche (people)

    Enets, an indigenous Arctic people who traditionally resided on the east bank of the lower Yenisey River of Russia. They numbered about 300 in the Russian census of 2002. The Enets live in the Arctic tundra, a region of permafrost, and are divided into two major groups, the so-called Tundra Enets

  • Enets (people)

    Enets, an indigenous Arctic people who traditionally resided on the east bank of the lower Yenisey River of Russia. They numbered about 300 in the Russian census of 2002. The Enets live in the Arctic tundra, a region of permafrost, and are divided into two major groups, the so-called Tundra Enets

  • Enets language

    Samoyedic languages: …subgroup consists of Nenets (Yurak), Enets (Yenisey), and Nganasan (Tavgi). The South Samoyedic subgroup comprises Selkup and the practically extinct Kamas language. None of these languages was written before 1930, and they are currently used only occasionally for educational purposes in some elementary schools.

  • Enewetak (atoll, Marshall Islands)

    Enewetak, atoll, northwestern end of the Ralik chain, Republic of the Marshall Islands, in the western Pacific Ocean. Circular in shape (50 miles [80 km] in circumference), it comprises 40 islets around a lagoon 23 miles (37 km) in diameter. During World War II it was captured from the Japanese by

  • Eneyida (work by Kotlyarevsky)

    Ukraine: Literature: In his work Eneyida (1798), he transformed the heroes of Virgil’s Aeneid into Ukrainian Cossacks. Classicist prose appeared only with Hryhorii Kvitka-Osnovianenko’s novel Marusya (1834).

  • Enez ar Gerveur (island, France)

    Belle-?le-en-Mer, island off the south coast of Brittany, western France, 8 miles (13 km) southwest of Presqu’?le de Quiberon and administratively part of Morbihan département, Bretagne région. As an outpost of the mainland ports of Saint-Nazaire and Lorient, a citadel on the island was

  • Enfance du Christ, L’? (work by Berlioz)

    oratorio: Oratorio after 1750: …oratorio of major importance is L’Enfance du Christ (1854) by Hector Berlioz, a series of theatrical tableaus.

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