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  • Pleuronectes platessa (fish)

    Plaice, (Pleuronectes platessa), commercially valuable European flatfish of the family Pleuronectidae. The plaice, like others of its family, normally has both eyes on the right side of the head. It also has about four to seven bony bumps near its eyes. It reaches a maximum length of about 90

  • Pleuronectidae (fish family)

    pleuronectiform: Annotated classification: Family Pleuronectidae (right-eyed flounders and halibuts) Eyes dextral; anus on blind side, commonly on or near midline; gill membranes connected; dorsal and anal fin rays shortened posteriorly; pelvic fin bases of ocular side short or long, on blind side short, 3–13 pelvic fin rays. 23 genera…

  • pleuronectiform (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

  • Pleuronectiformes (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

  • Pleuronectoidei (fish suborder)

    pleuronectiform: Annotated classification: Suborder Pleuronectoidei No spines in fins; however, 1 spine present in pelvic fin of Citharidae. Dorsal fin extending forward onto head; usually no supplemental bone on maxillary (may be present or absent in Citharidae); vertebrae 27–70 (generally numbering 34 or more); preopercular margin free; lower jaw…

  • Pleuronema (protozoan genus)

    hymenostome: In the genus Pleuronema the membrane is greatly enlarged to form a saclike food scoop. The order also contains parasites, such as the genus Ichthyophthirius, which attacks the skin of freshwater and aquarium fishes. The numerous, mostly marine species now known as the scuticociliates are classified here as…

  • Pleuroploca gigantea (mollusk)

    conch: It is rivaled by the Florida horse conch (Pleuroploca gigantea), sometimes more than 50 cm long, in the family Fasciolariidae, which includes tulip conchs (Fasciolaria).

  • pleuropneumonia (disease of cattle and sheep)

    Pleuropneumonia, lung disease of cattle and sheep, characterized by inflammation of the lungs and caused by the bacterium Mycoplasma mycoides. Fever, thirst, loss of appetite, and difficult breathing are signs of the disease. The United States and Europe eradicated the disease near the end of the

  • pleuropneumonia-like organism (biology)

    life: Sizes of organisms: …smallest free-living cells include the pleuropneumonia-like organisms (PPLOs). Whereas an amoeba has a mass of 5 × 10−7 gram (2 × 10−8 ounce), a PPLO, which cannot be seen without a high-powered electron microscope, weighs 5 × 10−16 gram (2 × 10−15 ounce) and is only about 100 nanometres across.…

  • pleurosaur (fossil reptile)

    tuatara: Evolution and classification: …group of aquatic species, the pleurosaurs, radiated into a small number of genera and species between the Early Jurassic and Early Cretaceous periods (approximately 200–100 million years ago). The pleurosaurs had an elongate body and tail and a streamlined head that suggest an active fish-eating lifestyle. After the Jurassic the…

  • Pleurothallidinae (plant subtribe)

    orchid: Natural history: …become predominantly fly-pollinated: the subtribe Pleurothallidinae in tropical America, containing more than 4,000 species; the Bulbophyllum group of about 1,800 species found mainly in the Old World; and the large genus Pterostylis and its relatives in Australia.

  • Pleurothallis (plant genus)

    Pleurothallis, large genus of orchids (family Orchidaceae) native to tropical and temperate areas of the Americas. A number of species are known as bonnet orchids and are grown for their attractive hooded flowers. Others, such as Pleurothallis leptotifolia and P. rowleei, are diminutive plants and

  • Pleurothallis macrophylla (plant)

    Pleurothallis: The widow orchid (P. macrophylla) is a dark, deep purple.

  • Pleurotomariacea (gastropod superfamily)

    gastropod: Classification: Superfamily Zeugobranchia (Pleurotomariacea) Slit shells (Pleurotomariidae) in deep ocean waters; abalones (Haliotidae) in shallow waters along rocky shores of western North America, Japan, Australia, and South Africa; keyhole limpets (Fissurellidae) in intertidal rocky areas. Superfamily Patellacea

  • Pleurotomariidae (gastropod family)

    gastropod: Classification: Zeugobranchia (Pleurotomariacea) Slit shells (Pleurotomariidae) in deep ocean waters; abalones (Haliotidae) in shallow waters along rocky shores of western North America, Japan, Australia, and South Africa; keyhole limpets (Fissurellidae) in intertidal rocky areas. Superfamily Patellacea (Docoglossa) Conical-shelled limpets, without slits or holes,

  • Pleurotus lampas (fungus)

    bioluminescence: The range and variety of bioluminescent organisms: …ghost fungus (Omphalotus nidiformis, formerly Pleurotus lampas) of Australia and the jack-o’-lantern (O. olearius, also known as Clitocybe illudens) of the United States, which reach approximately 13 cm (about 5 inches) in diameter.

  • Pleurotus ostreatus (fungus)

    Agaricales: Other families and genera: …from tree trunks is the oyster cap (Pleurotus ostreatus; family Pleurotaceae), so called because of its appearance. It is edible when young, but, as with most shelf and bracket fungi, it tends to become hard or leathery with age.

  • pleuston (biological organism)

    marine ecosystem: Physical and chemical properties of seawater: …surface of the water (pleuston) and sails with the assistance of a modified flotation chamber—contrasts sharply with the sleek, elongated shape of the barracuda.

  • Pleve, Vyacheslav Konstantinovich (Russian statesman)

    Vyacheslav Konstantinovich Plehve, Russian imperial statesman whose efforts to uphold autocratic principle, a police-bureaucratic government, and class privilege resulted in the suppression of revolutionary and liberal movements as well as minority nationality groups within the Russian Empire.

  • Pleven (Bulgaria)

    Pleven, town, northern Bulgaria. It lies a few miles east of the Vit River, which is a tributary of the Danube. At one time a Thracian settlement called Storgosia, the town was destroyed by Huns and was restored by the emperor Justinian I in the 6th century. Renamed Kajluka by Slavs, it became

  • Pleven Plan (European history)

    René Pleven: …for his sponsorship of the Pleven Plan for a unified European army. His efforts spurred the creation of the North Atlantic Treaty Organization (NATO).

  • Pleven, René (premier of France)

    René Pleven, French politician, twice premier of the Fourth Republic (1950–51, 1951–52), who is best known for his sponsorship of the Pleven Plan for a unified European army. His efforts spurred the creation of the North Atlantic Treaty Organization (NATO). After receiving a law degree from the

  • Pleven, Siege of (Russo-Turkish War)

    Siege of Pleven, (July 20–Dec. 10, 1877), in the Russo-Turkish War of 1877–78, the Russian siege of the Turkish-held Bulgarian town of Pleven (Russian: Plevna). Four battles were fought, three being repulses of Russian attacks and the fourth being a defeat of the Turks in their attempt to escape.

  • Plevna (Bulgaria)

    Pleven, town, northern Bulgaria. It lies a few miles east of the Vit River, which is a tributary of the Danube. At one time a Thracian settlement called Storgosia, the town was destroyed by Huns and was restored by the emperor Justinian I in the 6th century. Renamed Kajluka by Slavs, it became

  • Plevna, Siege of (Russo-Turkish War)

    Siege of Pleven, (July 20–Dec. 10, 1877), in the Russo-Turkish War of 1877–78, the Russian siege of the Turkish-held Bulgarian town of Pleven (Russian: Plevna). Four battles were fought, three being repulses of Russian attacks and the fourth being a defeat of the Turks in their attempt to escape.

  • Plevneliev, Rosen (president of Bulgaria)

    Bulgaria: Bulgaria’s transition: …when they elected GERB candidate Rosen Plevneliev president in October 2011. Bulgaria’s goal of greater integration with the EU continued to be frustrated, however, as EU authorities expressed concern that the country had not taken sufficient steps to reduce political corruption, organized crime, and threats to press freedom. As a…

  • plexiform layer (anatomy)

    photoreception: Neural transmission: …the horizontal cells (the outer plexiform layer), and between the bipolar cells and the ganglion cells, there exists a similar layer (the inner plexiform layer) containing amacrine cells of many different kinds. A great deal of complex processing occurs within the two plexiform layers. The main function of the horizontal…

  • plexiglas (chemical compound)

    Lucite, trademark name of polymethyl methacrylate, a synthetic organic compound of high molecular weight made by combination of many simple molecules of the ester methyl methacrylate (monomer) into long chains (polymer); this process (polymerization) may be effected by light or heat, although

  • Plexigum (chemical compound)

    major industrial polymers: Acrylic polymers: Kahlbaum prepared polymethyl acrylate, and in 1901 the German chemist Otto Röhm investigated polymers of acrylic esters in his doctoral research. A flexible acrylic ester, polymethyl acrylate, was produced commercially by Rohm & Haas AG in Germany beginning in 1927 and by the Rohm and Haas Company…

  • plexitis (pathology)

    neuritis: …a plexus of nerves (plexitis). When several single nerves are affected simultaneously, the condition may be referred to as mononeuritis multiplex. When widely separated nerves are affected, it is known as polyneuritis. The symptoms of neuritis are usually confined to a specific portion of the body served by the…

  • Pleyel, Camille (Austrian piano maker)

    Ignace Joseph Pleyel: The piano-manufacturing company Pleyel had founded in Paris in 1807 continued to prosper. In 1815 Pleyel’s eldest son, Camille (1788–1855), became a legal partner of the firm, which then adopted the name “Ignace Pleyel et fils aîné.” Recognized as a fine and sensitive pianist as well as an…

  • Pleyel, Ignace Joseph (Austrian-French composer)

    Ignace Joseph Pleyel, Austro-French composer, music publisher, and piano builder. Trained in music while still a very young child, he was sent in 1772 to Eisenstadt to become a pupil and lodger of Joseph Haydn’s. Pleyel later claimed a close, warm relationship had existed between them, and there is

  • Pleyel, Ignaz Josef (Austrian-French composer)

    Ignace Joseph Pleyel, Austro-French composer, music publisher, and piano builder. Trained in music while still a very young child, he was sent in 1772 to Eisenstadt to become a pupil and lodger of Joseph Haydn’s. Pleyel later claimed a close, warm relationship had existed between them, and there is

  • Pleyel, Lyon and Company (French piano company)

    keyboard instrument: Modern revival: …piano firms of Érard and Pleyel in Paris. Almost immediately, the full brunt of 19th-century piano technology was applied to the manufacture of the revived instruments, and they became increasingly massively strung and framed as time passed. Pedals for changing registers were included from the beginning, and Pleyel first added…

  • Pleyel, Marie-Félicité-Denise (French musician)

    Marie-Félicité-Denise Pleyel, French pianist and teacher, one of the most-celebrated virtuosos of the 19th century. She studied with Henri Herz, Friedrich Kalkbrenner, and Ignaz Moscheles, and by the age of 15 she was known in Belgium, Austria, Germany, and Russia as an accomplished virtuoso. She

  • PLF (Palestinian organization)

    Palestine: Years of mounting violence: …October 1985 members of the Palestine Liberation Front, a small faction within the PLO headed by Abū ʿAbbās, hijacked an Italian cruise ship, the Achille Lauro, and murdered one of its passengers. Following an Israeli bombing attack on PLO headquarters near Tunis several days before the hijacking, Arafat moved some…

  • PLI (political party, Italy)

    Italian Liberal Party, moderately conservative Italian political party that dominated Italian political life in the decades after unification (1861) and was a minor party in the period after World War II. The Liberal Party was first formed as a parliamentary group within the Piedmont assembly in

  • Pli selon pli (work by Boulez)

    Pierre Boulez: …in Pli selon pli (1957–62; Fold According to Fold), in which performers must orient themselves by maintaining a constant awareness of the structure of the work. In his Piano Sonata No. 3 (first performed 1957), as in Pli selon pli, he introduced elements of aleatory music.

  • plica adiposa (anatomy)

    joint: The synovial layer: …into the bursal cavity as fatty pads (plicae adiposae); these are wedge-shaped in section, like a meniscus, with the base of the wedge against the fibrous capsule. The fatty pads are large in the elbow, knee, and ankle joints.

  • plica circularis (anatomy)

    human digestive system: Absorption: These folds, known as plicae circulares, are approximately 5 to 6 cm (2 inches) long and about 3 mm (0.1 inch) thick. Plicae circulares are present throughout the small intestine except in the first portion, or bulb, of the duodenum, which is usually flat and smooth, except for a…

  • plica sublingualis (anatomy)

    human digestive system: The floor of the mouth: …papilla is a ridge (the plica sublingualis) that marks the upper edge of the sublingual (under the tongue) salivary gland and onto which most of the ducts of that gland open.

  • plica vocalis (anatomy)

    Vocal cord, either of two folds of mucous membrane that extend across the interior cavity of the larynx and are primarily responsible for voice production. Sound is produced by the vibration of the folds in response to the passage between them of air exhaled from the lungs. The frequency of these

  • plicae circulares (anatomy)

    human digestive system: Absorption: These folds, known as plicae circulares, are approximately 5 to 6 cm (2 inches) long and about 3 mm (0.1 inch) thick. Plicae circulares are present throughout the small intestine except in the first portion, or bulb, of the duodenum, which is usually flat and smooth, except for a…

  • plié (ballet movement)

    Plié, (French: “bent”), knee bend in ballet. It is used in jumps and turns to provide spring, absorb shock, and as an exercise to loosen muscles and to develop balance. Performed in all of the five basic foot positions, pliés may be shallow, so that the dancer’s heels remain on the floor

  • plied yarn (textile)

    textile: Ply yarns: Ply, plied, or folded, yarns are composed of two or more single yarns twisted together. Two-ply yarn, for example, is composed of two single strands; three-ply yarn is composed of three single strands. In making ply yarns from spun strands, the individual strands…

  • Pliekšāns, Jānis (Latvian author)

    Rainis, Latvian poet and dramatist whose works were outstanding as literature and for their assertion of national freedom and social consciousness. From 1891 to 1895 Rainis edited the newspaper Dienas Lapa, aimed at promoting social and class consciousness in the peasantry. Inspired by Marxist t

  • Pliensbachian Stage (stratigraphy)

    Pliensbachian Stage, third of the four divisions of the Lower Jurassic Series, representing all rocks formed worldwide during the Pliensbachian Age, which occurred between 190.8 million and 182.7 million years ago during the Early Jurassic Period. The Pliensbachian Stage overlies the Sinemurian

  • pliers (tool)

    Pliers, hand-operated tool for holding and gripping small articles or for bending and cutting wire. Slip-joint pliers have grooved jaws, and the pivot hole in one member is elongated so that the member can pivot in either of two positions in order to grasp objects of different size in the most

  • Plievier, Theodor (German author)

    Theodor Plievier, German war novelist who was one of the first native writers to begin examining Germany’s role in World War II and assessing the national guilt. Plievier was the son of a labourer, and he left home at the age of 17. He led a vagrant life until serving in the German Navy in World

  • Plight of People with Albinism in Tanzania, The

    As the campaign for the Tanzania general Election in October 2015 ramped up, people with albinism feared that they were potential targets for purveyors of human body parts and for traditional practitioners (adherents of practices rooted in traditional beliefs) who sometimes prepared the body parts

  • Plimpton 322 (ancient tablet)

    number theory: From prehistory through Classical Greece: A Babylonian tablet known as Plimpton 322 (c. 1700 bc) is a case in point. In modern notation, it displays number triples x, y, and z with the property that x2 + y2 = z2. One such triple is 2,291, 2,700, and 3,541, where 2,2912 + 2,7002 = 3,5412. This…

  • Plimpton, George Ames (American editor)

    George Ames Plimpton, American writer and editor (born March 18, 1927, New York, N.Y.—died Sept. 25/26, 2003, New York City), served as editor of the Paris Review from its first issue in 1953, guiding its publication of serious fiction and poetry, especially the works of new talent, and i

  • Plimpton, James (American inventor)

    roller-skating: Development of the roller skate: …was designed in 1863 by James Plimpton of Medford, Massachusetts, who broke from the in-line construction and used two parallel pairs of wheels, one set near the heel of the boot and the other near the front. He attached the wheel pairs to the boot using springy carriages known as…

  • Plimsoll line (international reference line)

    Plimsoll line, internationally agreed-upon reference line marking the loading limit for cargo ships. At the instigation of one of its members, Samuel Plimsoll, a merchant and shipping reformer, the British Parliament, in the Merchant Shipping Act of 1875, provided for the marking of a load line on

  • Plimsoll mark (international reference line)

    Plimsoll line, internationally agreed-upon reference line marking the loading limit for cargo ships. At the instigation of one of its members, Samuel Plimsoll, a merchant and shipping reformer, the British Parliament, in the Merchant Shipping Act of 1875, provided for the marking of a load line on

  • Plimsoll, Samuel (British politician and social reformer)

    Samuel Plimsoll, British politician and social reformer who dedicated himself to achieving greater safety for seamen and whose name has been given to a line on the side of a ship indicating the maximum depth to which that ship may be legally loaded. Plimsoll first entered the House of Commons as a

  • Plinia cauliflora (tree and fruit, Plinia species)

    Jaboticaba, (Plinia cauliflora), tree of the myrtle family (Myrtaceae) and its edible fruits. Jaboticaba is native to southeastern Brazil and has been introduced to other warm regions, including western and southern North America. The fruits can be eaten raw and are commonly used to make wines and

  • Plinian eruption (volcanism)

    volcano: Six types of eruptions: The Plinian type is an intensely violent kind of volcanic eruption exemplified by the outburst of Mount Vesuvius in Italy in ad 79 that killed the famous Roman scholar Pliny the Elder and was described in an eyewitness account by his nephew, the historian Pliny the…

  • plinth (architecture)

    Plinth, Lowest part, or foot, of a pedestal, podium, or architrave (molding around a door). It can also refer to the bottom support of a piece of furniture or the usually projecting stone coursing that forms a platform for a building. Tall stone plinths are often used to add monumentality to temple

  • plinthite (mineral)

    Plinthosol: …into ironstone concretions known as plinthite. The impenetrability of the hardened plinthite layer, as well as the fluctuating water table that produces it, restrict the use of these soils to grazing or forestry, although the hardened plinthite has value as subgrade material for roads or even as iron ore (the…

  • Plinthosol (FAO soil group)

    Plinthosol, one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Plinthosols form under a variety of climatic and topographic conditions. They are defined by a subsurface layer containing an iron-rich mixture of clay minerals (chiefly kaolinite) and

  • Pliny the Elder (Roman scholar)

    Pliny the Elder, Roman savant and author of the celebrated Natural History, an encyclopaedic work of uneven accuracy that was an authority on scientific matters up to the Middle Ages. Pliny was descended from a prosperous family, and he was enabled to complete his studies in Rome. At the age of 23,

  • Pliny the Younger (Roman author)

    Pliny the Younger, Roman author and administrator who left a collection of private letters that intimately illustrated public and private life in the heyday of the Roman Empire. Born into a wealthy family and adopted by his uncle, Pliny the Elder, Pliny began to practice law at age 18. His

  • Pliocene Epoch (geochronology)

    Pliocene Epoch, second of two major worldwide divisions of the Neogene Period, spanning the interval from about 5.3 million to 2.6 million years ago. The Pliocene follows the Miocene Epoch (23 million to 5.3 million years ago) and is further subdivided into two ages and their corresponding rock

  • Pliohippus (extinct mammal genus)

    Pliohippus, extinct genus of horses that inhabited North America during the Pliocene Epoch (5.3–2.6 million years ago). Pliohippus, the earliest one-toed horse, evolved from Merychippus, a three-toed horse of the preceding Miocene Epoch (23–5.3 million years ago). The teeth of Pliohippus are taller

  • Pliopithecidae (fossil primate family)

    primate: Miocene: In Europe, an archaic family, Pliopithecidae, was widespread. Remains of the best-known genus, Pliopithecus, from the Czech Republic have provided a remarkably complete picture of the habits of this group, which, on this evidence, appears to have possessed bodily forms of a tailed quadruped retaining numerous characteristics of New World…

  • Pliopithecus (fossil mammal genus)

    ape: …have yielded such fossils as Pliopithecus, once thought to be related to gibbons but now known to be primitive and long separated from them. Closer to the modern apes are Proconsul, Afropithecus, Dryopithecus, and Sivapithecus, the latter being a possible

  • pliosaur (fossil reptile group)

    Pliosaur, a group of large carnivorous marine reptiles characterized by massive heads, short necks, and streamlined tear-shaped bodies. Pliosaurs have been found as fossils from the Jurassic and Cretaceous periods (about 200 million to 65.5 million years ago). They are classified in the order

  • Pliosaurus funkei (pliosaur)

    plesiosaur: …funkei (known colloquially as “Predator X”), was unearthed in Svalbard in 2009. Its length and weight are estimated at 15 metres (about 50 feet) and 45 tonnes (almost 100,000 pounds), respectively. The jaws of this creature are thought to have produced a bite force of 33,000 psi (pound-force per…

  • Pliotrema (shark genus)

    saw shark: …two genera of saw sharks: Pliotrema, with six pairs of gill openings, and Pristiophorus, with five.

  • plique-à-jour (enamelwork)

    Plique-à-jour, (French: “open to light”), in the decorative arts, technique producing translucent enamels held in an open framework made by soldering individual wires or delicate metal strips to each other, rather than to a supporting surface as in cloisonné. The unattached support, usually a sheet

  • Plisetskaya, Maya (Russian ballerina)

    Maya Plisetskaya, Russian prima ballerina of the Bolshoi Ballet of Moscow, admired particularly for her technical virtuosity, expressive use of her arms, and ability to integrate acting with dancing. Plisetskaya, a niece of the dancers Asaf and Sulamith Messerer, studied with Pavel (or Paul)

  • Plisetskaya, Maya Mikhaylovna (Russian ballerina)

    Maya Plisetskaya, Russian prima ballerina of the Bolshoi Ballet of Moscow, admired particularly for her technical virtuosity, expressive use of her arms, and ability to integrate acting with dancing. Plisetskaya, a niece of the dancers Asaf and Sulamith Messerer, studied with Pavel (or Paul)

  • Plisnier, Charles (Belgian author)

    Charles Plisnier, Belgian novelist, short-story writer, poet, and essayist noted for his intense, analytical writing. Plisnier was active in leftist politics in his youth. Although trained as a lawyer, he wrote for several left-wing periodicals until he was ejected from the Communist Party he had

  • Plitvice Lakes (lakes, Croatia)

    Plitvička Lakes, continuous chain of 16 lakes and many waterfalls in western Croatia. The chain, 5 miles (8 km) in length, begins with two mountain streams that join near Plitvički Ljeskovac to form the Matica River. The river feeds Lake Prošće, the highest in elevation, and then flows by a number

  • Plitvice Lakes National Park (national park, Croatia)

    Plitvička Lakes: …are the focal point of Plitvička Lakes National Park, which is also a nature reserve.

  • Plitvička Jezera (lakes, Croatia)

    Plitvička Lakes, continuous chain of 16 lakes and many waterfalls in western Croatia. The chain, 5 miles (8 km) in length, begins with two mountain streams that join near Plitvički Ljeskovac to form the Matica River. The river feeds Lake Prošće, the highest in elevation, and then flows by a number

  • Plitvička Lakes (lakes, Croatia)

    Plitvička Lakes, continuous chain of 16 lakes and many waterfalls in western Croatia. The chain, 5 miles (8 km) in length, begins with two mountain streams that join near Plitvički Ljeskovac to form the Matica River. The river feeds Lake Prošće, the highest in elevation, and then flows by a number

  • Plitvička Lakes National Park (national park, Croatia)

    Plitvička Lakes: …are the focal point of Plitvička Lakes National Park, which is also a nature reserve.

  • Plivier, Theodor (German author)

    Theodor Plievier, German war novelist who was one of the first native writers to begin examining Germany’s role in World War II and assessing the national guilt. Plievier was the son of a labourer, and he left home at the age of 17. He led a vagrant life until serving in the German Navy in World

  • PLM (political party, Montserrat)

    Montserrat: History: …election of November 1978, the People’s Liberation Movement (PLM) won all seven seats to the Legislative Council. The party retained its control in 1983, but the opposition gained strength in the 1987 election. The PLM leadership favoured eventual independence after first achieving greater economic self-sufficiency. However, many merchants and other…

  • PLM (political party, Mexico)

    Mexico: Precursors of revolution: …where they formally organized the Mexican Liberal Party. It was anarcho-syndicalist in orientation, dedicated to the overthrow of the Mexican government and the total renovation of Mexican society.

  • PLN (political party, Costa Rica)

    Óscar Arias Sánchez: …began working for the social-democratic National Liberation Party (Partido Liberación Nacional; PLN), and in 1972 he was appointed minister of planning in the government of Pres. José Figueres Ferrer, a post he held until 1977. He was elected secretary-general of the PLN in 1979, and in 1986 he won the…

  • PLO (Palestinian political organization)

    Palestine Liberation Organization (PLO), umbrella political organization claiming to represent the world’s Palestinians—those Arabs, and their descendants, who lived in mandated Palestine before the creation there of the State of Israel in 1948. It was formed in 1964 to centralize the leadership of

  • PLO-Israel accord (Palestinian Liberation Organization-Israel [1993])

    two-state solution: Oslo peace process: In the 1990s a breakthrough agreement negotiated between Israeli and Palestinian leaders in Oslo, Norway, set out a process for a mutually negotiated two-state solution to be gradually implemented by the end of the decade. Although the process showed initial promise and…

  • ploce (literature)

    Ploce, the emphatic repetition of a word, with particular reference to its special significance (as in “a wife who was a wife indeed”). In rhetoric the term signifies the repetition of a word in an altered grammatical function, as in the line “Why wilt thou sleep the sleep of death?” from William

  • Ploceidae (bird family)

    Ploceidae, songbird family, order Passeriformes, including the bishops, weavers, and their allies. The approximately 120 species in this group are native chiefly to Africa, but several have been introduced elsewhere. Ploceids are small, compact birds with short, stout bills. In many species the

  • Ploceus cucullatus (bird)

    weaver: …species in Africa is the village weaver (Ploceus, formerly Textor, cucullatus). The baya weaver (P. philippinus) is abundant from Pakistan to Sumatra.

  • Płock (Poland)

    Płock, city, Mazowieckie województwo (province), central Poland, on the Vistula River. First chronicled in the 10th century, Płock is the oldest community in Mazowsze (Mazovia), having served as the seat of Polish rulers from 1079 to 1138. It received town privileges in 1237 and prospered as a

  • Plöckenstein (mountain, Czech Republic)

    Bohemian Forest: …the Bavarian (western) side and Plechý (Plöckenstein; 4,521 feet [1,378 m]) on the Czech (eastern) side. The Šumava is the source for the Vltava (German: Moldau) River, which cuts a broad trough through part of the region and is a source of hydroelectric power. Forests, both coniferous and deciduous, cover…

  • Plocnick, Battle of (Turkish history)

    Murad I: …Bosnians stopped the Ottomans at Pločnik, but in 1389 Murad and his son Bayezid (later Bayezid I) defeated them at the first Battle of Kosovo, although Murad was killed by a Serbian noble who pretended to defect to the Ottoman camp.

  • Plodia interpunctella (insect)

    pyralid moth: The Indian meal moth (Plodia interpunctella) originated in Europe but is now widespread throughout most of the world. The green or white larvae attack flour, grain, dried fruit, nuts, and other food products. The webs that they spin often contain their excrement and foul the infested…

  • Plody nauk (poem by Kheraskov)

    Mikhail Matveyevich Kheraskov: His didactic poem Plody nauk (1761; “The Fruits of the Sciences”) was a polemic against Jean-Jacques Rousseau’s attack on scientific progress. Though they were highly respected during the 18th century, Kheraskov’s works were rejected by the 19th century and now are read only by specialists.

  • Plody prosveshcheniya (play by Tolstoy)

    Konstantin Stanislavsky: Early influences: …first independent production, Leo Tolstoy’s The Fruits of Enlightenment, in 1891, a major Moscow theatrical event. Most significantly, it impressed a promising writer and director, Vladimir Nemirovich-Danchenko (1858–1943), whose later association with Stanislavsky was to have a paramount influence on the theatre.

  • Ploeşti (Romania)

    Ploieşti, city, capital of Prahova judeƫ (county), southeastern Romania. It is situated between the valleys of the Prahova and Teleajen rivers, north of Bucharest. According to legend the city was named after its founder, Father Ploaie, an escapee from Transylvania. The city is first documented in

  • ploidy (genetics)

    Ploidy, in genetics, the number of chromosomes occurring in the nucleus of a cell. In normal somatic (body) cells, the chromosomes exist in pairs. The condition is called diploidy. During meiosis the cell produces gametes, or germ cells, each containing half the normal or somatic number of

  • Ploieşti (Romania)

    Ploieşti, city, capital of Prahova judeƫ (county), southeastern Romania. It is situated between the valleys of the Prahova and Teleajen rivers, north of Bucharest. According to legend the city was named after its founder, Father Ploaie, an escapee from Transylvania. The city is first documented in

  • Plombières Agreement (Italian history [1858])

    Italy: The war of 1859: …a secret conference held at Plombières, France, in July 1858 he arranged with Emperor Napoleon III for French military intervention in the event of Austrian aggression against Piedmont. Cavour’s goal was the complete expulsion of Austrian troops from the peninsula. In return for this help Piedmont had to cede Savoy…

  • Plomer, William Charles Franklyn (South African writer)

    William Plomer, South African-born British man of letters, whose writing covered many genres: poetry, novels, short stories, memoirs, and even opera librettos. Plomer was educated in England but returned with his family to South Africa after World War I. His experience as an apprentice on a remote

  • Płomienie (work by Brzozowski)

    Stanisław Brzozowski: Płomienie (1908; “Flames”), considered Brzozowski’s first mature novel, is a fictional account of the Russian revolutionary movements connected with the secret organization Zemlya i Volya (“Land and Freedom”). The novel Sam wśród ludzi (1911; “Alone Among Men”) is the first volume of what was intended…

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