(from the article "asteroid") The next most distant class of NEAs is the Amors. Members of this group have perihelion distances that are greater than 1.017 AU, which is Earth's aphelion distance, but no ...
in ancient times, a Jewish scholar attached to one of several academies in Palestine (Tiberias, Sepphoris, Caesarea) or in Babylonia (Nehardea, Sura, Pumbedita). The amoraim collaborated in writing the Gemara, ... [6 Related Articles]
(from the article "Malvales") Cochlospermum (12 species), found throughout the tropics, and Amoreuxia (3 species), restricted to the southwestern United States and Central America, consist of herbs with stout roots to trees. The leaves ...
(from the article "Amorgos Island") ...and narrow, it has an area of about 47 square miles (121 square km). Prosperous in the early Bronze Age, in classical times it had three cities, Arcesine, Minoa, and ...
island trending northeast-southwest in the Cyclades (Kikladhes) group of the Greek Aegean Islands. For the most part mountainous and narrow, it has an area of about 47 square miles (121 ...
member of an ancient Semitic-speaking people who dominated the history of Mesopotamia, Syria, and Palestine from about 2000 to about 1600 BC. In the oldest cuneiform sources (c. 2400-c. 2000 ... [16 Related Articles]
one of the most ancient of the archaic Semitic languages, which are part of the Afro-Asiatic language phylum. Amorite was spoken in an area that is now northern Syria. It ... [1 Related Articles]
essayist, philosopher, and literary critic, a leading champion of the cause of intellectual freedom in Brazil. He was also an enthusiastic supporter of Modernismo, a Brazilian cultural movement of the ...
(from the article "carbon") ...of crystallinity. Diamond and graphite occur naturally on Earth, and they also can be produced synthetically; they are chemically inert but do combine with oxygen at high temperatures, just as ...
(from the article "industrial glass") ...have found use in threshold and memory switching devices and in xerography. A related end-member of this group is the elemental amorphous semiconductor solids, such as amorphous silicon (a-Si) and ...
(from the article "industrial polymers, chemistry of") Polymers exhibit two types of morphology in the solid state: amorphous and semicrystalline. In an amorphous polymer the molecules are oriented randomly and are intertwined, much like cooked spaghetti, and ...
(from the article "industrial glass") ...properties, chalcogenides have found use in threshold and memory switching devices and in xerography. A related end-member of this group is the elemental amorphous semiconductor solids, such as amorphous silicon ...
any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. [6 Related Articles]
American writer and animal rights advocate (b. Sept. 2, 1917, Nahant, Mass.--d. Oct. 14, 1998, New York, N.Y.), was the author of a number of best-selling books and founder (1967) ...
British writer of Irish descent, best known for his extravagant "autobiography," The Life of John Buncle, 2 vol. (1756 and 1766), in which the hero marries seven wives in succession, ...
the first Hebrew prophet to have a biblical book named for him. He accurately foretold the destruction of the northern kingdom of Israel (although he did not specify Assyria as ... [7 Related Articles]
the third of 12 Old Testament books that bear the names of the Minor Prophets, collected in one book under the Jewish canon titled The Twelve. Amos, a Judaean prophet ... [4 Related Articles]
British politician, the first woman of African descent to serve in a British cabinet and as leader of the House of Lords (2003-07). She was educated at Townley Grammar School ...
(from the article "amosite") a variety of the silicate mineral cummingtonite, which is a source of asbestos (see cummingtonite).classificationamphibolePhysical properties
(from the article "Atlas Mountains") ...that are dry except during periods of rain) issue from the Atlas ranges. Among the more perennial rivers are the Moulouya, which rises from the Middle Atlas, and the Chelif, ...
(from the article "China") ...is the Wu language, spoken in southern Jiangsu and in Zhejiang. This is followed, to the south, by the Fuzhou, or Northern Min, language of northern and central Fujian and ...
unit of electric current in the Systeme International d'Unites (SI), used by both scientists and technologists. Since 1948 the ampere has been defined as the constant current which, if maintained ... [4 Related Articles]
one of the basic relations between electricity and magnetism, stating quantitatively the relation of a magnetic field to the electric current or changing electric field that produces it. The law ... [1 Related Articles]
French physicist who founded and named the science of electrodynamics, now known as electromagnetism. His name endures in everyday life in the ampere, the unit for measuring electric current. [5 Related Articles]
French historian and philologist who initiated important studies of the diverse cultural origins of western European languages and mythology. A world traveler, he wrote both scholarly works and Romantic poetry.
(from the article "analysis") ...as a function of concentration of a series of standard solutions is prepared, and the concentration of the analyte is determined from the curve, or amperometry is used to locate ...
(from the article "analysis") During amperometric assays the potential of the indicator electrode is adjusted to a value on the plateau of the voltammetric wave, as during controlled-potential electrogravimetry and coulometry (see above). The ...
prototype of a series of synthetic drugs, all called amphetamines, that have pronounced stimulatory actions on the central nervous system. Amphetamine itself is a colourless liquid with an acrid taste ... [6 Related Articles]
any member of the group of vertebrate animals characterized by their ability to exploit both aquatic and terrestrial habitats. The name amphibian, derived from the Greek amphibios, ... [30 Related Articles]
(from the article "sound reception") ...vertebrate classes. In teleosts (bony fishes), amphibians, reptiles, and birds there is a lagena (a curved, flask-shaped structure), with its macula, the macula lagenae. Only the amphibians have a papilla ...
(from the article "heteropteran") ...among plants growing along margins of ponds and streams; predatory upon other insects; about 25 species; in all zoogeographic regions.Trichobothria on head but not on abdomen; members generally live ...
(from the article "seaplane") The addition of a retractable landing wheel gear to a float seaplane or flying boat, also accomplished by Curtiss, created the amphibian aircraft capable of operating from land runways or ...
(from the article "Evans, Oliver") ...driving sawmills and boring machines, and powering a dredge to clear the Philadelphia water frontage. Completed by June 1805, his new type of steam-engine scow, called the Orukter Amphibolos, or ...
device for transporting personnel and equipment, usually military, that can operate as a wheeled or tracked vehicle on land and as a boat in water. Two principal types appeared during ... [2 Related Articles]
military operations characterized by attacks launched from the sea by naval and landing forces against hostile shores. The main form is the amphibious assault, which may be conducted for any ... [1 Related Articles]
(from the article "sponge") ...the different groups; as a result, more than one type of larva is found. The characteristic larva of the Calcarea and of some members of the Demospongiae (e.g.,Oscarella), called ...
(from the article "gastropod") Brackish water or marine limpets with (Siphonariidae) gill-like structures or with a lung (Gadinidae).Operculum present; shell conical; with pulmonary cavity; brackish water; burrow in sand; 1 family.
(from the article "amphibole asbestos") a variety of the silicate mineral actinolite (q.v.).actinoliteactinoliteThe fibres of the magnesium-rich members in the series are asbestos; th
(from the article "amphibole") ...(hypothetical pure calcium amphibole) compositional field (Figure 1). This diagram is commonly referred to as the amphibole quadrilateral. Complete substitution extends from tremolite [Ca2Mg5Si8O22(OH)2] to ferro-actinolite...
a rock composed largely or dominantly of minerals of the amphibole group. The term has been applied to rocks of either igneous or metamorphic origin. In igneous rocks, the term ... [4 Related Articles]
one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which formed under conditions of moderate to high temperatures (500° C, or about 950° F, ... [1 Related Articles]
(from the article "logic") ...the individuals in the class are undergoing any change. A well-known, classic example of incorrect reasoning based on an ambiguity arising from the grammatical construction employed, the so-called amphiboly, is ...
(from the article "Poaceae") ...flowering because they are confined (cleistogamous). Most commonly, retention of spikelets within leaf sheaths prevents their opening and enforces self-pollination, but in a few species, such as Amphicarpum purshii of ...
(from the article "Caudata") ...passing through the vertebral column) is usually persistent in adults. An intervertebral cartilage forms the articulation between vertebrae. If it remains cartilaginous, the vertebrae are said to be amphicoelous (biconcave, ...
(from the article "annelid") ...or branched, arising from dorsal surface of anterior end; body divided into thorax and abdomen; tube of mucoid substance to which sediment adheres; size, 1 to 40 cm; examples of ...
(from the article "amphictyony") in ancient Greece, association of neighbouring states formed around a religious centre. The most important was the Amphictyonic League (Delphic Amphictyony). Originally composed of 12 tribes dwelling around Thermopylae, the ...
in ancient Greece, association of neighbouring states formed around a religious centre. The most important was the Amphictyonic League (Delphic Amphictyony). Originally composed of 12 tribes dwelling around Thermopylae, the ... [1 Related Articles]
(from the article "tide") ...of continents, and effects associated with the water depth result in much more complicated behaviour. For the main oceans, a combination of theory and observation indicates the existence of amphidromic ...
(from the article "gastropod") ...Many slugs and some snails bury egg masses in soil or under moist pieces of bark. Others, such as Discus, scatter their eggs singly over bark and decaying wood. One ...
(from the article "flatworm") ...tapeworms containing 1 set of genitalia; parasites of the body cavity or intestine of annelid worms or fish; about 105 species.Uterus long and N-shaped; genital pores at or near ...
in Greek mythology, the twin sons of Zeus by Antiope. When children, they were left to die on Mount Cithaeron but were found and brought up by a shepherd. Amphion ... [1 Related Articles]
(from the article "crustacean") ...gills; thoracic limbs with 2 well-developed branches; eggs usually shed freely; first larva a nauplius; 6-81 mm; worldwide; marine; about 85 species.Holocene; carapace large; mandible and maxillule vestigial; thoracic ...
any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata. Amphioxi are small marine animals found widely in the coastal waters of the warmer parts of the ... [6 Related Articles]
(from the article "primate") ...are plausibly argued to be those expected in the earliest ancestors of the Simiiformes. From slightly later, in Burma, come remains of further early simiiforms, Pondaungia and Amphipithecus. These have ...
any member of the invertebrate order Amphipoda (class Crustacea) inhabiting all parts of the sea, lakes, rivers, sand beaches, caves, and moist (warm) habitats on many tropical islands. Marine amphipods ... [6 Related Articles]
ancient Greek city on the Strymon (Strimon) River about three miles from the Aegean Sea, in Macedonia. A strategic transportation centre, it controlled the bridge over the Strymon and the ... [2 Related Articles]
(from the article "Devonian Period") ...rugose corals (horn corals), which have been used to establish correlations. Stromatoporoids (a type of sponge with a layered skeleton composed of calcium carbonates) such as Amphipora ...
(from the article "sound reception") The amphisbaenians form a little-known group of reptiles. Because they are burrowers and live almost entirely underground, they are seldom seen. The one species in the United States, Rhineura floridana, ...
agricultural centre, chief town of the eparkhia (eparchy) of Parnassus (Parnassos), capital of the nomos (department) of Fokis (Phocis), central Greece, at the northwestern ... [1 Related Articles]
freestanding building of round or, more often, oval shape with a central area, the arena, and seats concentrically placed around it. The word is Greek, meaning "theatre with seats on ... [5 Related Articles]
(from the article "Franconi, Antonio") ...trained canaries in France and Spain and in 1773 staged a bullfight in Rouen. He became associated with Astley's Amphitheatre in Paris, and in 1793 he leased the theatre from ...
extinct genus of early mammals known as fossils from Middle Jurassic deposits (of 176 million to 161 million years ago). Amphitherium is the earliest representative of the pantotheres, a group ...
in Greek mythology, the goddess of the sea, wife of the god Poseidon, and one of the 50 (or 100) daughters (the Nereids) of Nereus and Doris (the daughter of ...
in Greek mythology, son of Alcaeus, king of Tiryns. Having accidentally killed his uncle Electryon, king of Mycenae, Amphitryon fled with Alcmene, Electryon's daughter, to Thebes, where he was cleansed ...
any of three species of North American salamanders belonging to the family Amphiumidae (order Caudata). Because they are long and slender and have inconspicuous legs, they are often mistaken for ... [1 Related Articles]
(from the article "Caudata") ...ypsiloid cartilage present; Oligocene (36.6-23.7 million years ago) to present; North America; 1 genus, Ambystoma, and about 32 species.Large, to more than 100 cm; very elongated; aquatic ...
(from the article "separation and purification") ...negative charges and will therefore not migrate in an electric field. This pH value is called the isoelectric point. A slab gel (or column) can be filled with a complex ...
(from the article "soap and detergent") ...negative colloidal ions in solution.Cationic detergents, which produce electrically positive ions in solution.Nonionic detergents, which produce electrically neutral colloidal particles in solution.Ampholytic, or amphoteric, detergents, which are capable of acting ...
ancient Roman unit of capacity for grain and liquid products equal to 48 sextarii and equivalent to about 27.84 litres (7.36 U.S. gallons). The term amphora was ... [1 Related Articles]
ancient vessel form used as a storage jar and one of the principal vessel shapes in Greek pottery, a two-handled pot with a neck narrower than the body. There are ... [7 Related Articles]
(from the article "drug") Amphotericin B and nystatin are antimicrobial drugs that interact with ergosterol, a type of steroid that is found in fungal membranes; this binding results in the loss of membrane-selective permeability ...
in chemistry, reactivity of a substance with both acids and bases, acting as an acid in the presence of a base and as a base in the presence of an ... [4 Related Articles]
drug used in the treatment of various infections, including otitis media (middle ear infection), sinusitis, and acute bacterial cystitis. Ampicillin (or alpha-aminobenzylpenicillin) is a semisynthetic penicillin, one of the first ... [1 Related Articles]
(from the article "Anura") Females move toward and locate calling males. Once the male clasps the female in a copulatory embrace called amplexus, she selects the site for depositing the eggs. In the more ...
(from the article "Alexanderson, Ernst F.W.") ...railroads, ship propulsion, and electric motors. In 1916 he patented a selective-tuning device for radio receivers, which became an integral part of modern radio systems. He also developed the amplidyne, ...
(from the article "cancer") Gene amplification is another type of chromosomal abnormality exhibited by some human tumours. It involves an increase in the number of copies of a proto-oncogene, an aberration that also can ...
(from the article "distortion") in acoustics and electronics, any change in a signal that alters the basic waveform or the relationship between various frequency components; it is usually a degradation of the signal. Straight ...
in electronics, device that responds to a small input signal (voltage, current, or power) and delivers a larger output signal that contains the essential waveform features of the input signal. ... [11 Related Articles]
in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of ... [10 Related Articles]
(from the article "distortion") ...between various frequency components; it is usually a degradation of the signal. Straight amplification or attenuation without alteration of the waveform is not usually considered to be distortion. Amplitude distortion ...
(from the article "amplitude modulation") variation of the amplitude of a carrier wave (commonly a radio wave) in accordance with the characteristics of a signal, such as a vocal or musical sound composed of audio-frequency ...
(from the article "telecommunication") If amplitude is the only parameter of the carrier wave to be altered by the information signal, the modulating method is called amplitude-shift keying (ASK). ASK can be considered a ...
town (parish), Mid Bedfordshire district, administrative and historic county of Bedfordshire, England, 8 miles (13 km) south-southwest of Bedford. The Church of St. Andrew contains a monument to Richard Nicolls ...
(from the article "locomotion") ...within an arm, the movement of the tube feet is poorly coordinated, but small areas of the tube feet do move in synchrony. Each tube foot is a hollow elastic ...
a small narrow-necked, round-bodied vase for holding liquids, especially oil and perfumes. It was used in the ancient Mediterranean for toilet purposes and for anointing the bodies of the dead, ... [1 Related Articles]
(from the article "lateral line system") In sharks and rays, some neuromasts have been evolutionarily modified to become electroreceptors called ampullae of Lorenzini. These receptors are concentrated on the heads of sharks and can detect the ...
(from the article "ear, human") ...their position, superior, horizontal, and posterior (Figure 3). The superior and posterior canals are in diagonal vertical planes that intersect at right angles. Each canal has an expanded end, the ...
(from the article "ear, human") Each of the three bony canals and their ampullae encloses a membranous semicircular duct of much smaller diameter that has its own ampulla. The membranous ducts and ampullae follow the ...
(from the article "fallopian tube") ...over the ovary; they contract close to the ovary's surface during ovulation in order to guide the free egg. Leading from the infundibulum is the long central portion of the ...
(from the article "circulation") ...hearts at critical points in the circulatory system. Cephalopods have special muscular dilations, the branchial hearts, that pump blood through the capillaries, and insects may have additional ampullar hearts at ...
(from the article "pregnancy") Ampullar pregnancies, which are by far the most common, usually terminate either in a tubal abortion, in which the embryo and the developing afterbirth are expelled through the open end ...
(from the article "limpkin") ...flapping, neck extended, and legs dangling. It feeds on mollusks, crustaceans, aquatic insects, frogs, and worms. In the Florida Everglades it feeds chiefly on large, greenish, freshwater snails (Ampullaria). These, ...
(from the article "gastropod") Large, 2.5- to 5-cm globular pond and river snails of the Northern Hemisphere (Viviparidae) and tropical regions (Ampullariidae); frequently used in freshwater aquariums with tropical fish.Periwinkles, on rocky shores...
(from the article "inner ear") ...each other, so that they measure motions in all three planes. Within each semicircular canal is a semicircular duct. Each duct ends in a swelling called an ampulla, which houses ...
in medicine, removal of any part of the body. Commonly the term is restricted to mean surgical removal of a part of or an entire limb, either upper or lower ... [4 Related Articles]
(from the article "Business Overview") AMR, which owned American Airlines, earned $175 million in the third quarter, up from $15 million in the same period in 2006, a performance in part aided by increased passenger ...
