(from the article "lead processing") Lead silicates are considered to be the most versatile of lead chemical compounds in the ceramics industry. Three types are available commercially: lead monosilicate (PbO · 0.67SiO2), lead bisilicate (PbO ...
(from the article "electricity") ...(in metres per volt) is approximately 3 × 10−12 for quartz, 5 × −10−11 for ammonium dihydrogen phosphate, and 3 × 10−10 for lead zirconate titanate.
(from the article "glass") ...replaced by boric oxide (B2O3) and some of the lime by alumina. Another familiar special glass is the lead crystal glass used in the manufacture of superior tableware; by using ...
(from the article "Some radioactive decay series") Since the Earth was formed, the abundance of daughter product isotopes, such as those listed in Table 2, has increased through time. For example, the ratio of lead of mass ...
(from the article "Some radioactive decay series") ...uranium-lead. It is taken to be the time when these bodies formed and, by inference, the time at which a significant part of the solar system developed. When the evolution ...
method of age determination that makes use of the ratio of the radioactive lead isotope lead-210 to the stable isotope lead-206. The method has been applied to the ores of ... [1 Related Articles]
(from the article "Common household batteries") In 1859 Plante began experiments that resulted in construction of a battery for the storage of electrical energy; his first model contained two sheets of lead, separated by rubber strips, ...
(from the article "amorphous solid") In soda-lime-silica glasses, if lime is replaced by lead oxide (PbO) and if potash (K2O) is used as a partial replacement for soda, lead-alkali-silicate glasses result that have lower softening ...
(from the article "branch and twig borer") ...of western North America, is about 50 mm long. The apple twig, or grape cane, borer (Amphicerus bicaudatus) bores into living fruit-tree branches and grape vines but breeds in dead ...
(from the article "pottery") Basically, there are four principal kinds of glazes: feldspathic, lead, tin, and salt. (Modern technology has produced new glazes that fall into none of these categories while remaining a type ...
(from the article "automation") ...the robot the particular motion sequence and other actions that must be performed in order to accomplish its task. There are several ways that industrial robots are programmed. One method ...
American folk-blues singer, songwriter, and guitarist whose ability to perform a vast repertoire of songs, in conjunction with his notoriously violent life, made him a legend. [3 Related Articles]
(from the article "Unitarianism and Universalism") ...Petersen, who led groups of Philadelphian Pietists identifying themselves with the sixth church referred to in Revelation 3:7-13. A Philadelphian Society was organized in London in 1681 under Jane Leade, ...
(from the article "petroleum refining") The advent of leaded, or ethyl, gasoline led to the manufacture of high-octane fuels and became universally employed throughout the world after World War II. Lead is still an essential ...
(from the article "Leadenhall") The article "London" from the 3rd edition (1788-97) of Encyclopaedia Britannica was divided into 170 sections for ready reference. Section 53 treats the Leadenhall district of the city. Although the ...
(from the article "driving and coaching") ...by side in double harness, or, less commonly, one following the other in a tandem. Four horses, or a four-in-hand, are harnessed in two pairs, one following the other, and ...
(from the article "lightning") ...positive charge below it. This process creates a channel of partially ionized air-air in which neutral atoms and molecules have been converted to electrically charged ones. Next, a stepped leader ...
(from the article "operon") ...the corepressor. Some operons are under attenuator control, in which transcription is initiated but is halted before the mRNA is transcribed. This introductory region of the mRNA is called the ...
(from the article "collective behaviour") ...Many business concerns adopt an uneconomic generosity, and some individuals disregard their personal welfare. The imperious demand to "do something" at once creates an urgent demand for leadership. People turn ...
(from the article "stained glass") Neither painting on stained glass nor its assembly with grooved strips of leading is an indispensable feature of the art. Indeed, the leaded window may well have been preceded by ...
(from the article "economic indicator") statistic used, along with other indicators, in an attempt to determine the state of general economic activity, especially in the future. A "leading indicator" is one of a statistical series ...
(from the article "harmony") ...note of the scale (C, D, E . . . B). This note has a strong leading tendency toward the tonic, or keynote (here, C), because it is only a ...
(from the article "baseball") ...enters the game, he must take the spot in the batting order of the player he replaced. The first batter up for each side in the first inning is the ...
(from the article "Eagles, the") ...Glenn Frey (b. November 6, 1948Detroit, Michigan),Bernie Leadon (b. July 19, 1947Minneapolis, Minnesota), and Randy Meisner...
(from the article "drawing") ...for preliminary sketches. Aside from lead, tin and copper were also used, as well as sundry lead-and-pewter alloys. The 15th-century Venetian painter Jacopo Bellini's book of sketches in London with ...
city, seat (1878) of Lake county, central Colorado, U.S., located 103 miles (166 km) west of Denver and 38 miles (61 km) south of Vail. It is situated in the ... [1 Related Articles]
sculpture, ornamental objects, and architectural coverings and fittings made of lead. Although the ease with which lead is smelted from lead ores ensured its early discovery, the softness of the ... [2 Related Articles]
in botany, any usually flattened green outgrowth from the stem of a vascular plant. Leaves manufacture food for plants, which in turn ultimately nourish and sustain all land animals. Botanically, ... [36 Related Articles]
(from the article "Novikov, Sergey Petrovich") ...of Mathematicians in Nice, France, in 1970. One of his most impressive contributions in the field of topology was his work on foliations-decompositions of manifolds into smaller ones, called leaves. ...
(from the article "pottery") The wares of Bayreuth are particularly interesting. Early products were painted with a misty blue, but overglaze colours were speedily adopted. "Leaf and strapwork" (Laub-und-Bandelwerk) was a much used type ...
(from the article "angiosperm") The basic angiosperm leaf is composed of a leaf base, two stipules, a petiole, and a blade (lamina). The leaf base is the slightly expanded area where the leaf attaches ...
any of approximately 25,000 species of beetles (insect order Coleoptera) that occur throughout the world but are concentrated in the tropics. They are oval, short-legged, with the antennae about half ... [1 Related Articles]
(from the article "Helminthosporium") genus of fungi in the order Pleosporales (phylum Ascomycota, kingdom Fungi) that exists as asexual anamorphs and causes leaf blight, especially of grasses (e.g., bluegrass, corn, oats), in humid areas. ...
worldwide disease of many woody plants and ferns caused by fungi of the genus Taphrina. Following cold, wet weather at budbreak, leaves become swollen, crinkled, and distorted with yellow, red, ...
(from the article "plant bug") The members of the family Miridae, which is one of the largest heteropteran families (about 10,000 species), are also known as leaf bugs. They are brightly coloured and feed primarily ...
(from the article "angiosperm") Leaves initially arise from cell divisions in the shoot apical meristem. A slight bulge (a leaf buttress) is produced, which in dicots continues to grow and elongate to form a ...
the genus Epiphyllum, of about 15 species, family Cactaceae, native to tropical and subtropical America, including the West Indies. The plants are mostly epiphytic (grow on other plants) but sometimes ... [1 Related Articles]
hard, coarse fibre obtained from leaves of monocotyledonous plants (flowering plants that usually have parallel-veined leaves, such as grasses, lilies, orchids, and palms), used mainly for cordage. Such fibres, usually ...
any of about 10 species of fishes in the family Nandidae (order Perciformes). All live in fresh water, although some species may enter brackish water. Their geographic distribution is circumtropical, ...
(from the article "angiosperm") ...the base of the leaf as leaf traces, connecting the vascular system of the stem with that of the leaf. The point at which the stem bundle diverges from the ...
(from the article "gate") ...to resist the water pressure. When opened, they swing into recesses in the walls of the lock. Gates also regulate the outflow of water from storage reservoirs and through, around, ...
any of about 30 species of flat, green insects (order Phasmida) that have a leaflike appearance. The female has large leathery forewings (tegmina) that lie edge to edge on the ... [1 Related Articles]
any of a number of insect larvae that live and feed within a leaf. Leaf miners include caterpillars (order Lepidoptera), sawfly larvae (order Hymenoptera), beetle and weevil grubs or larvae ... [1 Related Articles]
(from the article "monkey") ...the West Indies. Old World monkeys include many that are often seen in zoos, especially the beautifully coloured African guenons (e.g., mona, diana, white-nosed, green, vervet, and grivet monkeys), colobus, ...
(from the article "langur") Leaf monkeys and other langurs are gregarious, diurnal, and basically arboreal monkeys with long tails and slender bodies. The limbs, hands, and feet are also long and slender. Depending on ...
(from the article "protein concentrate") a human or animal dietary supplement that has a very high protein content and is extracted or prepared from vegetable or animal matter. The most common of such substances are ...
any member of the worldwide insect family Tortricidae (order Lepidoptera), named for the characteristic leaf rolling habit of the larvae. The name bell moth arises from the shape of the ... [1 Related Articles]
(from the article "sugarcane") ...Fiji disease, a virus disease first reported from the Fiji islands, is characterized by elongated white to brown swellings on the underside of the leaves, followed by stunting and death. ...
(from the article "leaf") ...senile changes normal in older leaves. As a result, a zone of cells across the petiole becomes softened until the leaf falls. A healing layer then forms on the stem ...
(from the article "shutter") Modern shutters are of two principal types. The leaf shutter, positioned between or just behind the lens components, consists of a number of overlapping metal blades opened and closed either ...
(from the article "spring") The leaf spring is used mainly for vehicle suspension and in one form consists of a stack of slightly curved narrow plates of equal width and varying length clamped together, ...
(from the article "angiosperm") ...continuous not only with the primary vascular system of the root but also with the vascular bundles of the leaves. At each node, one or more longitudinal stem bundles enter ...
(from the article "bat") ...rocks, or walls. Unable to walk. Roosts usually dark and humid; some species roost exposed in forest canopy.10 small species in 2 genera of tropical Central and ...
any of a group of bees (order Hymenoptera), particularly genus Megachile, that differ from most other bees in that they collect pollen on their abdomens rather than on their hind ... [3 Related Articles]
(from the article "katydid") ...throughout the world; the United States is home to over 100 species. They live on trees, bushes, or grasses, often matching the appearance of their surroundings. Many species resemble leaves; ...
any of almost 250 species of New World and Old World bats belonging to the families Phyllostomidae and Hipposideridae that have a flat projection on the muzzle that often resembles ... [2 Related Articles]
any of four species of small burrowing snakes of the family Colubridae that have the nose shield enlarged and flattened, with free edges. Several subspecies of each also exist. The ...
any of a group of insects in the family Gryllacrididae (order Orthoptera) that are wingless or nearly wingless, have long cerci and antennae, and appear somewhat humpbacked. The California leaf ...
any member of a subgroup of the weevil family, Curculionidae (insect order Coleoptera) whose females protect newly laid eggs by rolling them up inside a growing leaf. After hatching, the ...
(genus Chloropsis), any of about eight species of short-legged, grass-green birds (family Irenidae, order Passeriformes), from Southeast Asia and the Philippines. Some authorities place the leafbird in the bulbul family ... [1 Related Articles]
any of 39 ant species abundant in the American tropics, easily recognized by their foraging columns composed of hundreds or thousands of ants carrying small pieces of leaves. These moving ... [4 Related Articles]
any of the small, slender, often beautifully coloured and marked sap-sucking insects of the large family Cicadellidae (Jassidae) of the order Homoptera. They are found on almost all types of ... [4 Related Articles]
(from the article "angiosperm") ...example, many leaves lack a petiole and so are attached directly to the stem (sessile), and others lack stipules (exstipulate). In compound leaves (Figure 2), a blade has two or ...
(from the article "Pereskia") genus of 16 species of trees, shrubs, and vines, family Cactaceae, native to the West Indies and southeastern South America, especially coastal areas. Leafy cactus (P. aculeata), also known as ...
any of numerous species of liverworts (class Hepatopsida), generally of the order Jungermanniales, in which the plant body is prostrate and extends horizontally in leaflike form with an upper and ... [2 Related Articles]
(from the article "spurge") Important as weeds are flowering spurge (E. corollata), of the middle and eastern United States; the leafy spurge (E. escula), naturalized from Europe in the northern United States and adjacent ...
any of several European units of measurement ranging from 2.4 to 4.6 statute miles (3.9 to 7.4 km). In English-speaking countries the land league is generally accepted as 3 statute ... [1 Related Articles]
(from the article "Nansen, Fridtjof") On July 5, 1922, on Nansen's initiative, an international agreement was signed in Geneva introducing the identification card for displaced persons known as the "Nansen passport." In 1931 the Nansen ...
nonpartisan American political organization that has pursued its mission of promoting active and unhampered participation in government since its establishment in 1920. [2 Related Articles]
in the Old Testament (primarily in Genesis), first wife of Jacob (later Israel) and the traditional ancestor of five of the 12 tribes of Israel. Leah was the mother of ... [1 Related Articles]
(from the article "Diamond Head") ...worship and human sacrifice. Originally called Leahi by native Hawaiians, the feature became known as Diamond Head in 1825 when British sailors mistook some volcanic calcite crystals for diamonds. Leahi ...
American college gridiron football coach whose teams at the University of Notre Dame won 87 games, lost 11, and tied 9. His career winning percentage of .864 (107-13-9) ranks second ...
(from the article "mass spectrometry") A widely used commercial device designed to locate leaks in vacuum systems consists of a small mass spectrometer with an electron-bombardment ion source that is connected to the troubled system. ...
(from the article "amphibole") ...composition and appearance shown by this mineral group. There are 5 major groups of amphibole leading to 76 chemically defined end-member amphibole compositions according to the British mineralogist Bernard E. ...
(from the article "Lancaster, Thomas, 2nd Earl of, Earl Of Leicester, Earl Of Derby") ...in the royal household in 1314 and by 1315 virtually controlled England. But his ambition became apparent, and a failure of statesmanship led to a fresh baronial grouping that by ...
British army officer, topographer, and antiquary whose surveys of ancient Greek sites were valuable for their accurate observation and helped lay the foundation for subsequent, more detailed description and excavation.
Kenyan archaeologist and anthropologist whose fossil discoveries in East Africa proved that human beings were far older than had previously been believed and that human evolution was centred in Africa, ... [10 Related Articles]
English-born archaeologist and paleoanthropologist who made several fossil finds of great importance in the understanding of human evolution. Her early finds were interpreted and publicized by her husband, the noted ... [5 Related Articles]
By 2007 paleoanthropologist Meave Leakey had engaged in fossil-finding fieldwork in the study of human origins for more than 35 years, and as the wife of Richard Leakey (son of ... [2 Related Articles]
Kenyan anthropologist, conservationist, and political figure who was responsible for extensive fossil finds related to human evolution and who campaigned publicly for responsible management of the environment in East Africa. [2 Related Articles]
(from the article "heredity") ...length will lead to a functionless protein. Any mutation that results in a lack of function for a particular gene is called a "null" mutation. Less-severe mutations are called "leaky" ...
(from the article "ocean") ...basins are plate motions exactly parallel to transform faults. In places where a component of opening motion occurs across the transform, volcanic activity results, and the fracture zone is termed ...
(from the article "Portuguese literature") ...a would-be social revolutionary prone to grandiloquence. In Os simples (1892) he turned to the portrayal of peasant life, and this work constituted his finest poetry. Akin to him was ...
(from the article "le Carre, John") ...best-known character and was featured in several later works. Le Carre's breakthrough came with his third novel, The Spy Who Came In from the Cold (1963), which centred on Alec ...
(from the article "aerospace industry") In 1992 the U.S. Air Force funded a study to evaluate the applicability of lean manufacturing to aerospace products. From that effort was established the Lean Aerospace Initiative, a consortium ...
(from the article "aerospace industry") Consistent with improving the economics of aerospace vehicles is the transition to a new paradigm for the entire industry, from concept development to operations. This approach involves all processes pertaining ...
(from the article "petroleum refining") ...liquids from the gas stream, a more complex refrigerated absorption and fractionation plant may be required. The compressed raw gas is processed in admixture with a liquid hydrocarbon, called lean ...
(from the article "greenhouse") ...flowers, and any other plants that require special conditions of temperature. The basic structural forms are the span-type greenhouse, which has a double-sloped, or A-shaped, roof, and the lean-to greenhouse, ...
(from the article "Hero and Leander") two lovers celebrated in Greek legend. Hero, virgin priestess of Aphrodite at Sestos, was seen at a festival by Leander of Abydos; they fell in love, and he swam the ...
(from the article "Isidore of Sevilla, Saint") Isidore succeeded his brother St. Leander as archbishop of Sevilla (Seville) about 600, during a time when the Spanish church witnessed numerous councils, one of the greatest being the fourth ...
Brazilian singer who, as half of the brother team Leandro and Leonardo, helped popularize sertanejo (country music) in Brazil and inspired the use of cowboys as an advertising image; his ...
medieval structure in Pisa, Italy, that is famous for the settling of its foundations, which caused it to lean 5.5 degrees (about 15 feet [4.5 metres]) from the perpendicular by ... [4 Related Articles]
(from the article "Christianity") The element of risk in faith as a free cognitive choice was emphasized, to the exclusion of all else, by Kierkegaard in his idea of the leap of faith. He ...
year containing some intercalary period, especially a Gregorian year having a 29th day of February instead of the standard 28 days. The astronomical year, the time taken for the Earth ... [9 Related Articles]
(from the article "bonito") The leaping bonito (Cybiosarda elegans) is a related Indo-Pacific food and sport fish. The oceanic bonito is the skipjack tuna (see tuna).
(from the article "English literature") ...her sparkling Embassy to Constantinople (often called Turkish Letters), published posthumously in 1763. Notable female poets later in the century include Mary Leapor, a Northhamptonshire kitchen servant ...
(from the article "King Lear") The aging King Lear decides to divide his kingdom among his three daughters, allotting each a portion in proportion to the eloquence of her declaration of love. The hypocritical Goneril ...
legendary British king and central character of William Shakespeare's King Lear. One of the most moving of Shakespeare's tragic figures, Lear grows in self-awareness as he diminishes in authority and ...
English landscape painter who is more widely known as the writer of an original kind of nonsense verse and as the popularizer of the limerick. His true genius is apparent ... [5 Related Articles]
