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  • heteropteran (insect order)

    Heteropteran, any member of the insect order Heteroptera, which comprises the so-called true bugs. (Some authorities use the name Hemiptera; others consider both the heteropterans and the homopterans to be suborders of the Hemiptera.) This large group of insects, consisting of more than 40,000

  • Heteroscelus brevipes (bird)

    tattler: …tattler (Heteroscelus incanus) and the Polynesian, or gray-rumped, tattler (H. brevipes). Both closely resemble the yellowlegs but are short-legged and have barred underparts in summer. The wandering tattler nests on gravel bars in Alaskan rivers and winters from Mexico to western Pacific islands. The slightly smaller Polynesian tattler does not…

  • Heteroscelus incanus (bird)

    tattler: …name is given to the wandering tattler (Heteroscelus incanus) and the Polynesian, or gray-rumped, tattler (H. brevipes). Both closely resemble the yellowlegs but are short-legged and have barred underparts in summer. The wandering tattler nests on gravel bars in Alaskan rivers and winters from Mexico to western Pacific islands. The…

  • heterosexuality (biology)

    gender identity: …be adopted later in life; heterosexual or homosexual orientations also develop later.

  • Heterosigma (algae genus)

    algae: Annotated classification: …50 species; includes Chattonella, Gonyostomum, Heterosigma, Psammamonas, and Vacuolaria. Class Synurophyceae Previously placed in Chrysophyceae; silica-scaled; unicellular or colonial flagellates sometimes alternating with capsoid benthic stage; cells covered with elaborately structured silica scales; approximately 250 species;

  • heterosis (genetics)

    Heterosis, the increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits. The first-generation offspring generally

  • Heterosomata (fish order)

    Pleuronectiform, (order Pleuronectiformes), any one of about 680 species of bony fishes characterized by oval-shaped, flattened bodies as in the flounder, halibut, and turbot. The pleuronectiforms are unique among fishes in being asymmetrical. They are strongly compressed, with both eyes on one

  • Heterospathe (plant genus)

    palm: Characteristic morphological features: …from 6 to 36 in Heterospathe, to more than 200 in such groups as Caryota, Phytelephas, and Veitchia. Sterile stamens may differ only slightly from fertile stamens, or they may consist of a filament alone without an anther, or be united in a cup about the base of the female…

  • heterospecific brood parasitism (animal behaviour)

    animal social behaviour: The ultimate causes of social behaviour: Heterospecific brood parasitism is even more common with cuckoos and cowbirds (Molothrus), which lay eggs in the nests of a diversity of other species.

  • heterospecific mating (biology)

    Heterospecific mating, mating in which the man and woman have incompatible blood types, such that the woman may develop antibodies to her partner’s blood type. This mating causes difficulties in childbirth, since there is a chance that the child conceived in a heterospecific mating will have its

  • heterosphere (atmospheric science)

    protonosphere: …atmospheric constituents, whereas in the heterosphere, above 100 km, the various constituents tend to separate out.

  • heterospory (botany)

    plant: Heterosporous life histories: A heterosporous life history occurs in some pteridophytes and in all seed plants. It is characterized by morphologically dissimilar spores produced from two types of sporangia: microspores, or male spores, and megaspores (macrospores), or female spores. In pteridophytes, megaspores are typically larger…

  • heterostracan (fossil vertebrate order)

    agnathan: Form and function: The extinct heterostracans include obvious bottom dwellers (Drepanaspis) and others (Pteraspis) that were apparently adapted to mid-water, or nektonic, life. Some heterostracans, for example, had movable enamel plates inside the lower lip, probably to provide a biting or grazing mechanism. Osteostracans, anaspids, hagfishes, and lampreys have one…

  • Heterostraci (fossil vertebrate order)

    agnathan: Form and function: The extinct heterostracans include obvious bottom dwellers (Drepanaspis) and others (Pteraspis) that were apparently adapted to mid-water, or nektonic, life. Some heterostracans, for example, had movable enamel plates inside the lower lip, probably to provide a biting or grazing mechanism. Osteostracans, anaspids, hagfishes, and lampreys have one…

  • heterostructure (semiconductor)

    materials science: Epitaxial layers: …form what is called a heterostructure. Most continuously operating semiconductor lasers consist of heterostructures, a simple example consisting of 1000-angstrom thick gallium arsenide layers sandwiched between somewhat thicker (about 10000 angstroms) layers of gallium aluminum arsenide—all grown epitaxially on a gallium arsenide substrate. The sandwiching and repeating of very thin…

  • heterostyly (botany)

    pollination: Structural: …flowers that discourages selfing is heterostyly, or variation in the length of the style (neck of the pistil). This occurs in the common primrose (Primula vulgaris) and species of wood sorrel (Oxalis) and flax. In most British primrose populations, for example, approximately half the individuals have so-called “pin” flowers, which…

  • heterothallism (reproduction)

    fungus: Sexual incompatibility: …fungi are said to be heterothallic. Many fungi, however, are homothallic; i.e., sex organs produced by a single thallus are self-compatible, and a second thallus is unnecessary for sexual reproduction. Some of the most complex fungi (e.g., mushrooms) do not develop differentiated sex organs; rather, the sexual function is carried…

  • heterothermy (zoology)

    Cold-bloodedness, the state of having a variable body temperature that is usually only slightly higher than the environmental temperature. This state distinguishes fishes, amphibians, reptiles, and invertebrate animals from warm-blooded, or homoiothermic, animals (birds and mammals). Because of

  • Heterothripidae (insect family)

    thrips: Annotated classification: Family Heterothripidae Cretaceous (Cedar Lake amber) to present. Western Hemisphere and India. Antennae nine-segmented; ovipositor downturned; forewings narrow, surface with microtrichia; antennal sensors on intermediate segments as flat discs or protruding peglike cones. Family Thripidae Oligocene (Baltic amber) to present. Worldwide. Antennae 6- to

  • heterothyrotropic effect (biology)

    hormone: Luteinizing hormone (interstitial-cell-stimulating hormone): This so-called heterothyrotropic effect has led to the supposition that FSH, LH, and thyrotropin may have evolved by modification of a common ancestral glycoprotein molecule, resulting in an overlap of properties.

  • Heterotis (fish genus)

    bony tongue: …African Clupisudis (also known as Heterotis), the South American arawana (Osteoglossum bicirrhosum), and two species of the East Indian genus Scleropages.

  • Heterotis niloticus (fish)

    osteoglossomorph: Life cycle and reproduction: The African arowana (Heterotis niloticus) prepares a crude nest from grasses in newly flooded swamp plains. The male guards the young and leads them from the nest on feeding excursions. Both sexes of Arapaima gigas of South America dig a spawning pit and guard the developing…

  • heterotopic graft (surgery)

    transplant: Transplants and grafts: …situation and are then called heterotopic—for example, kidneys are usually grafted into the lower part of the abdomen instead of into the loin (the back between the ribs and the pelvis), as this is more convenient. If an extra organ is grafted, it is called auxiliary or accessory—for example, a…

  • heterotransplant (surgery)

    cardiovascular disease: Valvular disease: …human beings after death) and heterograft valves (secured from animals) is widespread. One of the advantages of both types is the absence of clotting, which occurs occasionally with the use of artificial valves. Most homograft and heterograft valves have a durability of 10–15 years. There is a risk of endocarditis…

  • heterotrich (protozoan order)

    Heterotrich, any member of the ciliated protozoan order Heterotrichida. Complete ciliation is typical, although there is a tendency toward loss of the cilia, which are minute hairlike processes, in several families. Heterotrichs generally are considered primitive because of their uniform ciliation.

  • Heterotrichida (protozoan order)

    Heterotrich, any member of the ciliated protozoan order Heterotrichida. Complete ciliation is typical, although there is a tendency toward loss of the cilia, which are minute hairlike processes, in several families. Heterotrichs generally are considered primitive because of their uniform ciliation.

  • heterotroph (ecology)

    Heterotroph, in ecology, an organism that consumes other organisms in a food chain. In contrast to autotrophs, heterotrophs are unable to produce organic substances from inorganic ones. They must rely on an organic source of carbon that has originated as part of another living organism.

  • heterotrophic hypothesis (biology)

    Aleksandr Oparin: …hypothesis, the earliest organisms were heterotrophic; i.e., they obtained their nutrition ready-made from compounds that had already been formed in variety and profusion by what are in the laboratory quite ordinary means. Thus, at that early stage, these first organisms did not need to synthesize their own food materials in…

  • heterotrophy (ecology)

    Heterotroph, in ecology, an organism that consumes other organisms in a food chain. In contrast to autotrophs, heterotrophs are unable to produce organic substances from inorganic ones. They must rely on an organic source of carbon that has originated as part of another living organism.

  • heterotropia (physiology)

    Strabismus, misalignment of the eyes. The deviant eye may be directed inward toward the other eye (cross-eye, or esotropia), outward, away from the other eye (exotropia), upward (hypertropia), or downward (hypotropia). The deviation is called “concomitant” if it remains constant in all directions

  • heterozygote (biology)

    human genetic disease: Autosomal dominant inheritance: It manifests itself in the heterozygote (designated Aa), who receives a mutant gene (designated a) from one parent and a normal (“wild-type”) gene (designated A) from the other. In such a case the pedigree (i.e., a pictorial representation of family history) is vertical—that is, the disease passes from one generation…

  • heterozygous allele (biology)

    human genetic disease: Autosomal dominant inheritance: It manifests itself in the heterozygote (designated Aa), who receives a mutant gene (designated a) from one parent and a normal (“wild-type”) gene (designated A) from the other. In such a case the pedigree (i.e., a pictorial representation of family history) is vertical—that is, the disease passes from one generation…

  • heterozygous beta-thalassemia (pathology)

    blood disease: Thalassemia and hemoglobinopathies: …mild form of the disease, thalassemia minor, there is usually only slight or no anemia, and life expectancy is normal. Thalassemia major (Cooley anemia) is characterized by severe anemia, enlargement of the spleen, and body deformities associated with expansion of the bone marrow. The latter presumably represents a response to…

  • Hetfield, James (American musician)

    Metallica: …lead singer and rhythm guitarist James Hetfield (b. August 3, 1963, Downey, California, U.S.), drummer Lars Ulrich (b. December 26, 1963, Gentofte, Denmark), lead guitarist Kirk Hammett (b. November 18, 1962, San Francisco, California), and bassist Cliff Burton (b. February 10, 1962, San Francisco—d. September 27, 1986, near Stockholm, Sweden).…

  • Heth, Joice (American performer)

    circus: History: …charlatan) in 1834 by promoting Joice Heth, an African American woman in her 80s, as the 161-year-old former nurse to George Washington. His next major enterprise was the acquisition of New York’s American Museum, which he turned into a showcase for the sensational and the bizarre. More than 82 million…

  • Hetherington, E. Mavis (Canadian-born developmental psychologist)

    E. Mavis Hetherington, Canadian-born developmental psychologist best known for her work on the effects of divorce and remarriage on child development. She also made significant contributions to research on childhood psychopathology, personality and social development, and stress and coping. She

  • Hetherington, Eileen Mavis (Canadian-born developmental psychologist)

    E. Mavis Hetherington, Canadian-born developmental psychologist best known for her work on the effects of divorce and remarriage on child development. She also made significant contributions to research on childhood psychopathology, personality and social development, and stress and coping. She

  • Hetherington, Hector Alastair (British journalist)

    Alastair Hetherington, British journalist who, in his role as the newspaper’s editor (1956–75), transformed the Manchester Guardian from a well-regarded, left-of-centre regional daily into The Guardian, a London-based, highly respected national newspaper (b. Oct. 31, 1919, Llanishen,

  • Hethum (king of Little Armenia)

    Hayton, king of Little Armenia, now in Turkey, from 1224 to 1269; the account of his travels in western and central Asia, written by Kirakos Gandzaketsi, a member of his suite, gives one of the earliest and most comprehensive accounts of Mongolian geography and ethnology. Throughout his reign

  • Hethumid dynasty (Armenian history)

    Little Armenia: …Armenian noble, ruled as the Hethumid dynasty until 1342. After initial trouble with the Byzantine Empire, Little Armenia established itself and developed contacts with the West. Frankish culture, disseminated by Frankish families traveling on Crusades, had considerable influence on the development of Little Armenia. The kingdom was also important for…

  • Hétköznapok (work by Jókai)

    Mór Jókai: Early works such as Hétköznapok (1846; “Weekdays”) show the influence of French Romanticism, but his mature novels are more concerned with reality and personal experience. Egy magyar nábob (1853–54; A Hungarian Nabob) and Az arany ember (1873; The Man with the Golden Touch, or Timar’s Two Worlds) are among…

  • hetman (historical military title)

    Hetman, military title used in the Polish–Lithuanian state (16th–18th century); the hetman wielki (“great hetman”) was the chief of the armed forces and the commander in the field when the king was not present. In Ukraine a variation of the term, ataman, was used to designate the military leader

  • Hetmanate (historical state, Ukraine)

    Ukraine: The autonomous hetman state and Sloboda Ukraine: …the autonomous hetman state, or Hetmanate, was limited territorially to the east, in Left Bank Ukraine. (The hetman state in Right Bank Ukraine, under at least nominal Polish control, was abolished by the Poles at the turn of the 18th century.) At the head of the state stood the hetman,…

  • Hetorrhina dohrni (insect)

    flower chafer: The colour of Hetorrhina dohrni of Sumatra, one of the most beautiful insects, changes with shifts in light from black and gold-green to deep orange-red.

  • HETP (chemistry)

    chromatography: Column efficiency: …theoretical plate (or plate height), HETP (or h), which is L/N, L being the length of the column. Efficient columns have small h values (see below Plate height).

  • Hets (film by Sjöberg)

    Svensk Filmindustri: …as Hets (1944; Torment, or Frenzy), directed by Alf Sjöberg and written by Ingmar Bergman (who had joined Svensk in 1942), focused worldwide attention on Swedish films. In the 1940s and ’50s Svensk continued to encourage such experimental filmmakers as Gösta Werner and Arne Sucksdorff, who were producers of short…

  • Hetsilinga (Germany)

    Esslingen, city, Baden-Württemberg Land (state), southwestern Germany. It lies along the Neckar River, just southeast of Stuttgart. Mentioned in 777 as Cella and in 866 as Hetsilinga, it was chartered about 1219. It was a free imperial city from 1360 to 1802, when it passed to Württemberg, the

  • Hettangian Stage (stratigraphy)

    Hettangian Stage, lowest of the four divisions of the Lower Jurassic Series, representing all rocks formed worldwide during the Hettangian Age, which occurred between 201.3 million and 199.3 million years ago during the Early Jurassic Period. The Hettangian Stage underlies the Jurassic Sinemurian

  • Hettche, Thomas (German writer)

    German literature: The turn of the 21st century: Thomas Hettche’s Nox (1995; “Night”) has a strangely omniscient narrator in the form of a young man whose throat has been slit in a sadomasochistic sexual act during the night the Wall came down. Nox draws a rather too obvious equivalence between its narrator’s wound,…

  • Hettner, Alfred (German geographer)

    Alfred Hettner, German geographer who sought to place geography on a firm philosophical and scientific foundation. He strongly influenced the modern development of geography in Germany. While completing work on his doctorate at the University of Strasbourg (now in France), Hettner became

  • hetu (Buddhist philosophy)

    pratyaya: …from a direct cause (hetu). A seed, for example, is a direct cause of a plant, while sunshine, water, and earth are auxiliary causes of a plant. Sometimes pratyaya means the cause in general.

  • hetu-pratyaya (Buddhist philosophy)

    pratyaya: …from a direct cause (hetu). A seed, for example, is a direct cause of a plant, while sunshine, water, and earth are auxiliary causes of a plant. Sometimes pratyaya means the cause in general.

  • Hetuchakra (work by Dignaga)

    Indian philosophy: Contributions of Dignaga and Dharmakirti: In his Hetuchakra (“The Wheel of ‘Reason’ ”), Dignaga set up a matrix of nine types of middle terms, of which two yield valid conclusions, two contradictory, and the rest uncertain conclusions. Dignaga’s tradition is further developed in the 7th century by Dharmakirti, who modified his definition…

  • Hetum (king of Little Armenia)

    Hayton, king of Little Armenia, now in Turkey, from 1224 to 1269; the account of his travels in western and central Asia, written by Kirakos Gandzaketsi, a member of his suite, gives one of the earliest and most comprehensive accounts of Mongolian geography and ethnology. Throughout his reign

  • Hetumid dynasty (Armenian history)

    Little Armenia: …Armenian noble, ruled as the Hethumid dynasty until 1342. After initial trouble with the Byzantine Empire, Little Armenia established itself and developed contacts with the West. Frankish culture, disseminated by Frankish families traveling on Crusades, had considerable influence on the development of Little Armenia. The kingdom was also important for…

  • Hetzer, Ludwig (Swiss Anabaptist)

    Ludwig Haetzer, Anabaptist, iconoclast, and Reformer. After studies at Freiburg im Breisgau, Haetzer was probably consecrated as a priest and given a chaplaincy near Zürich. He abandoned his position by 1523 and went to Zürich, where he joined the Reformation and became a literary polemicist in its

  • Heuchera sanguinea (plant)

    Coral-bells, (Heuchera sanguinea), hardy garden perennial, of the saxifrage family (Saxifragaceae), native to North America from Mexico to the Arctic. Coral-bells is a compact, bushy plant growing in tufts, with flower stems about 45 centimetres (18 inches) tall. It has spikes covered with pendant

  • heulandite (mineral)

    Heulandite, hydrated sodium and calcium aluminosilicate mineral in the zeolite family, formulated (Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O. It forms brittle, transparent, coffin-shaped crystals in various shades of white through red, gray, or brown. Heulandite’s molecular structure is an open framework

  • Heulenburg, Heulalius von (German physician and writer)

    Heinrich Hoffmann, German physician and writer who is best known for his creation of Struwwelpeter (“Slovenly Peter”), a boy whose wild appearance is matched by his naughty behaviour. Peter appeared in Lustige Geschichten und drollige Bilder mit füntzehn schön kolorten Tafeln für Kinder von 3–6

  • Heuneburg (ancient site, Germany)

    Heuneburg, Celtic fortified site overlooking the Danube River in Baden-Württemberg Land (state), Germany. Recent excavations have shown that the Heuneburg fort community carried on a prosperous trade with the Greeks at Massilia (Marseille) during the 6th century bc. Imported Greek black-figure

  • Heureaux, Ulises (president of Dominican Republic)

    Ulises Heureaux, president of the Dominican Republic who allowed most of his country’s economy to fall under U.S. control. The republic’s fiscal disorder led to American intervention after Heureaux’s assassination. Heureaux received some schooling in a Methodist mission and then joined a revolt

  • Heures claires, Les (work by Verhaeren)

    Émile Verhaeren: …intimate Les Heures claires (1896; The Sunlit Hours) is an avowal of his love for his wife; it led to the series of his major works, among which the most outstanding are Les Visages de la vie (1899; “The Faces of Life”), the five-part Toute la Flandre (1904–11; “All of…

  • Heuristic DENDRAL (expert system)

    DENDRAL, an early expert system, developed beginning in 1965 by the artificial intelligence (AI) researcher Edward Feigenbaum and the geneticist Joshua Lederberg, both of Stanford University in California. Heuristic DENDRAL (later shortened to DENDRAL) was a chemical-analysis expert system. The

  • heuristic program solving (computing)

    artificial intelligence: Theoretical work: …principles—a process now known as heuristic problem solving.

  • heuristic reasoning

    chess: Master search heuristics: The ability of a machine to play chess well has taken on symbolic meaning since the first precomputer devices more than a century ago. In 1890 a Spanish scientist, Leonardo Torres y Quevado, introduced an electromagnetic device—composed of wire, switch, and circuit—that was capable…

  • Heurschling, Andrée (French actress)

    Jean Renoir: Early years: …one of his father’s models, Andrée Heurschling, a few months after the painter’s death, and went with her to live in Marlotte, a village near Paris in which his father had once painted.

  • Heusler alloy (metallurgy)

    Heusler alloy, any of the first magnetic alloys composed of metals that, in their pure state, are not magnetic. The alloys are named after Fritz Heusler, 19th-century German mining engineer and chemist. Heusler alloys consist of approximately two parts of copper, one of manganese, and one of tin.

  • Heusler, Fritz (German mining engineer and chemist)

    Heusler alloy: The alloys are named after Fritz Heusler, 19th-century German mining engineer and chemist. Heusler alloys consist of approximately two parts of copper, one of manganese, and one of tin. The tin may be replaced by aluminum, arsenic, antimony, bismuth, or boron; the copper may be replaced by silver.

  • Heuss, Theodor (German statesman)

    Theodor Heuss, liberal democratic legislator, first president of West Germany, author, and leader of the Free Democratic Party (Freie Demokratische Partei, FDP). He also helped draft a new constitution for postwar West Germany. After receiving a political science degree from the University of

  • Heusser, Johanna (Swiss writer)

    Johanna Spyri, Swiss writer whose Heidi, a book for children, is popular all over the world. Her psychological insight into the child mind, her humour, and her ability to enter into childish joys and sorrows give her books appeal and lasting value. After her marriage in 1852 to Bernhard Spyri, a

  • Heutsz, Johannes Benedictus van (Dutch general)

    Johannes Benedictus van Heutsz, Dutch general and governor-general of the Dutch East Indies (1904–09) who conquered the Sumatran kingdom of Aceh (also spelled Acheh, or Atjeh) and brought all of Indonesia directly under Dutch rule. Van Heutsz was sent to Aceh as a subaltern in 1873 and won fast

  • HEV (blood vessel)

    lymph node: …through specialized blood vessels called high endothelial venules (HEVs). HEVs contain a single layer of large endothelial cells that possess surface receptors specific for B and T lymphocytes. As these cells pass through the HEVs, they bind to the receptors and are carried into the paracortex of the lymph node.

  • HEV (infectious agent)

    hepatitis: Hepatitis E: Discovered in the 1980s, the hepatitis E virus (HEV) is similar to HAV. HEV is transmitted in the same manner as HAV, and it, too, only causes acute infection. However, the effects of infection with HEV are more severe than those caused by HAV, and death is more common. The…

  • Hevajra (Buddhist deity)

    Hevajra, in northern Buddhism, a fierce protective deity, the yab-yum (in union with his female consort, Nairatmya) form of the fierce protective deity Heruka. Hevajra is a popular deity in Tibet, where he belongs to the yi-dam (tutelary, or guardian, deity) class. His worship is the subject of the

  • Hevajra Tantra (Buddhist scripture)

    Sa-skya-pa: …Tibetan the important Tantric work Hevajra Tantra, which remains one of the basic texts of the order. He also transmitted into Tibet from India the teachings of the lam-’bras (“path and result”).

  • Hevajra-tantra (Buddhist scripture)

    Sa-skya-pa: …Tibetan the important Tantric work Hevajra Tantra, which remains one of the basic texts of the order. He also transmitted into Tibet from India the teachings of the lam-’bras (“path and result”).

  • Hevea brasiliensis (plant)

    Rubber tree, (Hevea brasiliensis), South American tropical tree of the spurge family (Euphorbiaceae). Cultivated on plantations in the tropics and subtropics, especially in Southeast Asia and western Africa, it replaced the rubber plant in the early 20th century as the chief source of natural

  • hevehe (totem mask)

    mask: Social and religious uses: …Guinea build mammoth masks called hevehe, attaining 20 feet (6 metres) in height. They are constructed of a palm wood armature covered in bark cloth; geometric designs are stitched on with painted cane strips. These fantastic human-animal masks are given a frightening aspect. When mask wearers emerge from the men’s…

  • Hevelius, Johannes (Polish astronomer)

    Johannes Hevelius, astronomer who compiled an atlas of the Moon (Selenographia, published 1647) containing one of the earliest detailed maps of its surface as well as names for many of its features. A few of his names for lunar mountains (e.g., the Alps) are still in use, and a lunar crater is

  • Hever Castle (castle, Kent, England, United Kingdom)

    Edenbridge: …Churchill, and the 13th-century double-moated Hever Castle, the childhood home of Anne Boleyn, whose grounds are now home to the Festival Theatre at Hever Castle. Also nearby is Penshurst Place, which dates from 1341, when the soaring medieval Baron’s Hall was built as a country retreat for a lord mayor…

  • Heves (county, Hungary)

    Heves, megye (county), northern Hungary. It is bounded by the counties of Borsod-Abaúj-Zemplén to the north and east, Jász-Nagykun-Szolnok to the south, Pest to the southwest, and Nógrád to the west. The main cities are Eger—the county seat, in the Eger River valley—and the industrial centres of

  • Hevesy, Georg Charles von (Hungarian-Swedish chemist)

    Georg Charles von Hevesy, chemist and recipient of the 1943 Nobel Prize for Chemistry. His development of isotopic tracer techniques greatly advanced understanding of the chemical nature of life processes. In 1923 he also discovered, with the Dutch physicist Dirk Coster, the element hafnium.

  • Hevesy, George Charles de (Hungarian-Swedish chemist)

    Georg Charles von Hevesy, chemist and recipient of the 1943 Nobel Prize for Chemistry. His development of isotopic tracer techniques greatly advanced understanding of the chemical nature of life processes. In 1923 he also discovered, with the Dutch physicist Dirk Coster, the element hafnium.

  • Ḥevron (city, West Bank)

    Hebron, city in the West Bank, situated in the southern Judaean Hills south-southwest of Jerusalem. Located about 3,050 feet (930 metres) above sea level, Hebron long benefited from its mountainous clime, which encouraged the cultivation of fruit trees and vineyards. In addition, its location at a

  • HEW (United States government)

    Dwight D. Eisenhower: First term as president: …the spring of 1953 the Department of Health, Education, and Welfare was created.

  • Hewart of Bury, Baron (lord chief justice of England)

    Gordon Hewart, 1st Viscount Hewart, lord chief justice of England from 1922 to 1940. A scholar of University College, Oxford, Hewart was called to the bar at the Inner Temple in 1902 and practiced on the northern circuit. After an unsuccessful contest for a seat in Parliament in northwest

  • Hewart, Gordon Hewart, 1st Viscount (lord chief justice of England)

    Gordon Hewart, 1st Viscount Hewart, lord chief justice of England from 1922 to 1940. A scholar of University College, Oxford, Hewart was called to the bar at the Inner Temple in 1902 and practiced on the northern circuit. After an unsuccessful contest for a seat in Parliament in northwest

  • Hewart, Sir Gordon (lord chief justice of England)

    Gordon Hewart, 1st Viscount Hewart, lord chief justice of England from 1922 to 1940. A scholar of University College, Oxford, Hewart was called to the bar at the Inner Temple in 1902 and practiced on the northern circuit. After an unsuccessful contest for a seat in Parliament in northwest

  • Hewel, Johann (Polish astronomer)

    Johannes Hevelius, astronomer who compiled an atlas of the Moon (Selenographia, published 1647) containing one of the earliest detailed maps of its surface as well as names for many of its features. A few of his names for lunar mountains (e.g., the Alps) are still in use, and a lunar crater is

  • Heweliusz, Jan (Polish astronomer)

    Johannes Hevelius, astronomer who compiled an atlas of the Moon (Selenographia, published 1647) containing one of the earliest detailed maps of its surface as well as names for many of its features. A few of his names for lunar mountains (e.g., the Alps) are still in use, and a lunar crater is

  • Hewetson, Christopher (British sculptor)

    Western sculpture: Relation to the Baroque and the Rococo: … the Elder, John Deare, and Christopher Hewetson, the last two working mostly in Rome. The leading artist of the younger generation was John Flaxman, professor of sculpture at the Royal Academy and one of the few British artists of the period with an international reputation. The last generation of Neoclassicists…

  • Hewett, Dorothy Coade (Australian writer)

    Dorothy Coade Hewett, Australian writer (born May 21, 1923, Perth, Australia—died Aug. 25, 2002, Springwood, N.S.W., Australia), rebelled against the comforts of a conventional lifestyle to embrace progressivist causes in her life and her work. A self-styled “modern Romantic,” Hewett crossed g

  • Hewish, Antony (British physicist)

    Antony Hewish, British astrophysicist who won the Nobel Prize for Physics in 1974 for his discovery of pulsars (cosmic objects that emit extremely regular pulses of radio waves). Hewish was educated at the University of Cambridge and in 1946 joined the radio astronomy group there led by Sir Martin

  • Hewitt, Abram Stevens (mayor of New York City)

    Abram Stevens Hewitt, American industrialist, philanthropist, and politician who in 1886 defeated Henry George and Theodore Roosevelt to become mayor of New York City. Hewitt won a scholarship to Columbia College (now part of Columbia University). He graduated in 1842 and remained at Columbia as an

  • Hewitt, Angela (Canadian musician)

    The Well-Tempered Clavier, BWV 846–893: Sviatoslav Richter, Angela Hewitt, and András Schiff. A performance by American composer Wendy (formerly Walter) Carlos of two of the prelude and fugue numbers from Book I is noteworthy for having been played on a Moog synthesizer (Switched-On Bach, 1968). She made other recordings of Baroque music…

  • Hewitt, Don S. (American television producer)

    Don S. Hewitt, American television producer who was perhaps best known for creating and producing the television news magazine 60 Minutes. After serving as a war correspondent in World War II, Hewitt joined CBS in 1948, and he directed its first televised evening news broadcast, with Douglas

  • Hewitt, Donald Shepard (American television producer)

    Don S. Hewitt, American television producer who was perhaps best known for creating and producing the television news magazine 60 Minutes. After serving as a war correspondent in World War II, Hewitt joined CBS in 1948, and he directed its first televised evening news broadcast, with Douglas

  • Hewitt, Henry Kent (United States naval officer)

    Henry Kent Hewitt, U.S. naval officer who directed important amphibious landings in Europe during World War II. A graduate of the U.S. Naval Academy at Annapolis, Md., in 1906, Hewitt commanded the destroyer “Cummings” during World War I. When World War II broke out, he was put in charge of naval

  • Hewitt, Lleyton (Australian athlete)

    Lleyton Hewitt, Australian professional tennis player whose astonishing court speed, fierce determination, and unrelenting ground strokes allowed him to capture victories at both the U.S. Open (2001) and Wimbledon (2002). Hewitt was born into an exceedingly athletic family; his father, uncle, and

  • Hewitt, Lleyton Glynn (Australian athlete)

    Lleyton Hewitt, Australian professional tennis player whose astonishing court speed, fierce determination, and unrelenting ground strokes allowed him to capture victories at both the U.S. Open (2001) and Wimbledon (2002). Hewitt was born into an exceedingly athletic family; his father, uncle, and

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