Encyclopedia

Pygmy Mouse Lemur The Pygmy Mouse Lemur (Microcebus myoxinus), also known as Peters' Mouse Lemur, is the smallest of the mouse lemurs and the smallest primate in the world, only weighing around 30 grams (roughly 1 ounce). Its dorsal side is a rufous-brown colour, and creamy-white ventrally.
Pygmy Nuthatch The Pygmy Nuthatch (Sitta pygmaea) is a tiny songbird, about 10 cm (4 inches) long and about 10 grams in weight. It ranges from southern British Columbia south through various discontinuous parts of the western U.
Pygmy ribbontail catshark The pygmy ribbontail catshark, Eridacnis radcliffei, is a finback catshark of the family Proscylliidae, found in the Indo-Pacific oceans, from Tanzania, the Gulf of Aden, India (Gulf of Mannar, Bay of Bengal), the Andaman Islands, Viet Nam, and the Philippines, at depths of between 70 and 750 m. It reaches a length of 24 cm, and is one of the two smallest living sharks .
Pygmy Right Whale The Pygmy Right Whale (Caperea marginata) is a baleen whale and as such is a marine mammal of the order Cetacea. The whale, which lives in the Southern Hemisphere, was first described by Gray in 1846, and is the sole member of the genus Caperea and the family Neobalaenidae.
Pygmy shark The pygmy shark, Euprotomicrus bispinatus, the smallest of all the shark species, is a sleeper shark of the Dalatiidae family, the only member of the genus Euprotomicrus, found in subtropical and warm temperate oceans worldwide, from the surface to depths of 1,800 m. Their length is up to about 27 cm for females and about 22 cm for males.
Pygmy Sperm Whale The Pygmy Sperm Whale (Kogia breviceps) is one of three species of whale in the sperm whale family. They are not often sighted at sea and most of our understanding of the creatures comes from the study of washed-up specimens
Pygmy Three-toed Sloth The Pygmy Three-toed Sloth (Bradypus pygmaeus) is a newly discovered three-toed sloth. Located on the tiny island of Isla Escudo de Veraguas off the coast of Panama and as its name suggests, is a dwarf of its mainland relatives.
Pygoscelis The genus Pygoscelis ("elbow-legged") contains three living species of penguins collectively known as "The Brush-Tailed Penguins". Their appearance - black above, white below - is that of what most people think of when they think of penguins.
Pyhä-Häkki National Park Pyhä-Häkki National Park (Pyhä-Häkin kansallispuisto) is a national park in Western Finland. It was established in 1956 (extended in 1982 when Kotaneva was joined to it) and covers 13 square kilometres (5 mi²).
Pyhä-Luosto National Park Pyhä-Luosto National Park (Pyhä-Luoston kansallispuisto) is a national park in Lapland Province, Finland. It was established in 2005 when Finland's oldest national park, Pyhätunturi National Park (established in 1938) was joined to Luosto.
Pyhrnautobahn The Pyhrnautobahn (A9) ('Pyhrn Motorway') is motorway, or ‘Autobahn’, in Austria. It runs through Alps with help of two long tunnels - one-tube 5,400 meters long Bosrucktunnel and one-tube 8,320 meters long Gleinalmtunnel.
Pyinmana Pyinmana (Burmese: ; population: 100,000 (2006 estimate)) is a logging town and sugar cane refinery center in Mandalay Division of Myanmar. The administrative capital of Myanmar was officially moved to a militarised greenfield site (which the leader, Than Shwe, dubbed Naypyidaw, or Royal City) two miles west of Pyinmana on November 6, 2005.
Pyjamarama Pyjamarama is a computer game for the ZX Spectrum, Amstrad CPC and Commodore 64. It features Wally Week as the central character and is the second (after Automania) of a series of games featuring Wally and/or members of his family.
Pyknon Pyknon (Greek: "condensation", "density", plurals: pykna, pyknomata, pyknoma)), when used in biology, describe a nonrandom pattern of repeated elements, which are found more frequently in the 3′ untranslated regions of genes than in other regions of the human genome. Although it is unclear how pyknons might have arisen, it is possible that they may be involved in a new form of gene regulation.
Pyknosis Pyknosis, or karyopyknosis, is the irreversible condensation of chromatin in the nucleus of a cell undergoing programmed cell death or apoptosis . It is followed by karyorrhexis, or fragmentation of the nucleus.
Pykrete Pykrete is a composite material made of approximately 14% sawdust (or, less frequently, wood pulp) and 86% ice by weight, invented by Max Perutz and proposed during World War II by Geoffrey Pyke to the Royal Navy as a candidate material for making a huge, unsinkable aircraft carrier, Project Habbakuk, actually more of a floating island than a ship in the traditional sense. Pykrete has some interesting properties, notably its relatively slow melting rate (due to low thermal conductivity), and its vastly improved strength and toughness over pure ice, actually closer to concrete.
Pyle Pyle () is a village in Bridgend county borough, south Wales. It is a settlement served by the A48 road, has a railway station frequented by numerous trains running between Cardiff and Swansea, and also lies less than two miles from Junction 37 of the M4 motorway, and is therefore only a half-hour journey from the capital city of Cardiff.
Pyle's massacre Pyle's Massacre, also known as Pyle's Hacking Match, was a battle that took place during the American Revolutionary War in Orange County, North Carolina (present-day Alamance County, North Carolina), on February 24, 1781, between Patriot and Loyalist North Carolina militia troops.
Pylea In the fictional universe established by the television series Angel, Pylea is a world in an alternate dimension where demons are the dominant life form and humans are treated as animals to be used as beasts of burden or even food. In fact, the Pylean word for humankind appears to be "cow.
Pylephlebitis Pylephlebitis (also called infective suppurative thrombosis of the portal vein) is an inflammation of the portal vein or any of its branches. It is usually a complication of intraabdominal sepsis, most often following diverticulitis or appendicitis.
Pylon test facility Mannheim [Pylon test facility Mannheim is a facility operated by ABB] in [[Mannheim, Germany for the examination of the static characteristics of pylons. The plant existing since 1959 can be used for the examination from pylons to a hitting a corner handle distance of 18x18 meters.
Pylon turn A pylon turn is a flight maneuver in which an aircraft banks into a circular turn around a fixed spot on the ground. This maneuver originated early in the 20th century in air racing and was first used in combat in 1964 during the Vietnam War.
Pylons of Pearl River Crossing The pylons of the Pearl River Crossing are three electricity pylons with heights of 240 metres (787 feet), 253 metres (830 feet) and 80 metres (262 feet). They carry the 500kV-three phase AC powerline between Jiangmen and Sha Jiao in Guangdong, China at the crossing of the Pearl River.
PyLinda PyLinda is a Python implementation of the Linda coordination language. It is supposed to be a very simple implementation of the Linda distributed computing environment but it supports several newly proposed extensions to Linda like garbage collection, multiple tuple spaces, bulk tuple operations, etc.
Pymble Ladies' College Pymble Ladies' College, or PLC, is a private girls school in Pymble, Sydney, Australia. It was founded in 1916 as the Presbyterian Ladies College, Pymble, a branch of the Presbyterian Ladies' College, Sydney in Croydon, by the Presbyterian Church of Australia.
Pymore Pymore is a small village one mile north of Bridport, Dorset. Served by a pub, The Pymore Inn, Pymore has recently undergone a redevelopment - the site of the old rope factory, around the River Brit now contains a small development of new houses and apartments.
PyMOL PyMOL is an open-source, user-sponsored, molecular visualization system created by Warren Lyford DeLano and commercialized by DeLano Scientific LLC, which is a private software company dedicated to creating useful tools that become universally accessible to scientific and educational communities. It is well suited to producing high quality 3D images of small molecules and biological macromolecules such as proteins.
Pyogenic granuloma Pyogenic granuloma, also referred to as pregnancy tumor, is a primarily oral pathologic condition that appears in the mouth as an overgrowth of tissue due to irritation or trauma. It is often also found to involve the skin and nasal septum.
Pyochungsa Pyochungsa, originally Jungnimsa, is a Korean Buddhist temple of the Jogye Order of Korean Buddhism. It stands on the slopes of Jaeyaksan mountain near Cheonhwangsan in the Yeongnam Alps in Danjang-myeon, northern Miryang, South Korea.
Pyomyositis Pyomyositis, also known as tropical pyomyositis or myositis tropicans is a bacterial infection of the skeletal muscles which results in a pus-filled abscess. Pyomyositis is more common in tropical areas but can also occur in the temperate zones.
Pyongsong P'yĹŹngsĹŹng is a city in North Korea, the capital city of the province South Pyongan in western North Korea. The city is located about 32 kilometres northeast of Pyongyang, and was formally established in December 1969.
Pyongyang Declaration Pyongyang Declaration was a declaration signed by communist, workers, socialist and progressive parties, on the occasion of the 80th birthday of Kim Il-Sung in April 1992. It is entitled 'Let Us Defend and Advance the Cause of Socialism'.
Pyongyang Film Festival The Pyongyang International Film Festival is a biennial cultural exhibition held in Pyongyang, the capital of North Korea. The film festival is an unusually cosmopolitan event for a state known to be reclusive to Western contact.
Pyotr Andreyevich Shuvalov Count Pyotr Andreyevich Shuvalov (граф Пётр Андреевич Шувалов) (1827 - 1889) was an influential Russian statesman and a counselor to Tsar Alexander II. Referring to his reactionary policies, his more liberal opponents sometimes called him Arakcheev II.
Pyotr Anokhin Pyotr Kuzmich Anokhin (Пётр Кузьми́ч Ано́хин) (1898 – 1974), was a Russian biologist and physiologist who made important contributions to cybernetics and functional systems. The pioneering concepts of feedback were published in 1935.
Pyotr Bagration Prince Pyotr (Petre) Bagration (Russian: Пётр Иванович Багратион, Pëtr Ivanovič Bagration, ) (1765 - September 12, 1812), was an ethnic Georgian and descendant of the Georgian royal family of the Bagrations, and served as a Russian general. He was born in 1765, in Kizlyar (Dagestan, Northern Caucasus).
Pyotr Dmitrievich Gorchakov Prince Pyotr Dmitrievich Gorchakov () (1790–1868) served under Mikhail Kamensky and Mikhail Kutuzov in the campaign against Turkey, and afterwards against France in 1813–1814. In 1820 he suppressed an insurrection in the Caucasus, for which service he was raised to the rank of major-general.
Pyotr Dmitrievich Sviatopolk-Mirskii Prince Pyotr Dmitrievich Sviatopolk-Mirskii ( - ) was a Russian politician and police official, Minister of a Interior in 1904 - 1905. He was the son of the general Dmitry Ivanovitch Sviatopolk-Mirskii and father of the literary historian D.
Pyotr Chaadaev Pyotr Yakovlevich Chaadaev or Petr Yakovlevich Chaadaev (Russian: Пётр Яковлевич Чаадаев) ( 1794-1856 ) was a Russian philosopher, who published his "Philosophical letters" about Russia in French in 1829, which circulated in Russia as manuscript for many years. The works could not be published in Russia because of its highly critical nature of Russia's significance in world history and politics.
Pyotr Kapitsa Pyotr Leonidovich Kapitsa (Russian Пётр Леонидович Капица) (July 9, 1894 – April 8, 1984) was a Russian physicist who discovered superfluidity with contribution from John F. Allen and Don Misener in 1937.
Pyotr Klimuk Pyotr Ilyich Klimuk (Belarusian: Пётр Ільі́ч Кліму́к; Russian: Пётр Ильи́ч Климу́к; born July 10, 1942 in Komarovka, USSR (now in Belarus) was a Soviet cosmonaut who made three flights into space.
Pyotr Kozmitch Frolov Pyotr Kozmitch Frolov (Фролов, Пётр Козьмич in Russian) (January 16(27), 1775 – December 10(22), 1839), was a Russian mining engineer and inventor who, in 1809, built the first horse-railway in Russia. He elaborated on various canal projects and other artificial water constructions.
Pyotr Krasnov Pyotr Nikolayevich Krasnov (Петр Николаевич Краснов in Russian) (September 22 (10 old style), 1869 — January 17, 1947), sometimes referred to in English as Peter Krasnov, was Lieutenant General of the Russian army when the revolution broke out in 1917, and one of the leaders of the counterrevolutionary White movement afterwards.
Pyotr Leshchenko Pyotr Konstantinovich Leshchenko (; 14 June 1898 - 16 July 1954), a Russian singer, universally considered "the King of Russian Tango" and specifically known for his rendition of Serdtse—the most famous tango song not in the Spanish language—was born a citizen of the Russian Empire in Isaeva (now part of Ukraine) into a poor and illiterate peasant family. During the First World War, his mother and stepfather moved to Kishinev (now part of Moldavia) which was later annexed by Romania.
Pyotr Masherov Pyotr Mironovich Masherov ( [transliteration Piotr Mironavič Mašeraŭ]; ), - October 4, 1980) was the secretary of Belarusian committee of the Communist Party of Soviet Union and a communist leader of Soviet Belarus.
Pyotr Mokharov Pyotr Vladimirovich Mokharov was a Soviet engineer who is often referred to as the father of the Soviet Motorcycle Industry. He is most famous for his early work at IZH as well as the design of the NATI (PMZ)-A-750 motorcycle for the Red Army.
Pyotr Nikolaevich Kropotkin Pyotr Nikolaevich Kropotkin ( November 24 1910 - 1996) was a Russian geologist, tectonician, and geophysicist. Main publications devoted to tectonics and its relationships with magmatism and to tectonigeophysical problems.
Pyotr Nikolayevich Wrangel Baron Pyotr Nikolayevich Wrangel (Пётр Николаевич Врангель) () (August 15, 1878, Zarasai, Lithuania (then Imperial Russia) — April 25, 1928, Brussels, Belgium), was a commanding general of the Whites in Southern Russia in the later stages of the Russian Civil War.
Pyotr Nilus Pyotr Alexandrovich Nilus (; Podolia - 23 May 1943 Paris) Pyotr Nylus, the poet of art, Odessa, N3, 1996 Some sources set the death date as 1940. See discussion on was a Russia]n impressionist painter and writer.
Pyotr Patrushev Pyotr Patrushev is the only escapee to survive a swim from Russia to Turkey across the Black Sea border in 1962. A competitive swimmer in Russia, he became a broadcaster, journalist, conference interpreter and translator in the West, working for the BBC in London and later for the Radio Liberty in Munich and San Francisco, as well as writing for Australian newspapers, radio and television.
Pyotr Pletnyov Pyotr Alexandrovich Pletnev (Russian: Петр Александрович Плетнёв) ( — ) was a minor Russian poet and literary critic, who rose to become the dean of the St. Petersburg University (1840-61) and academician of the Petersburg Academy of Sciences (1841).
Pyotr Semenov-Tyan-Shansky Pyotr Petrovich Semenov-Tyan-Shansky (Russian: Пётр Петрович Семёнов-Тян-Шанский) (2 January (New style: 14 January), 1827 – 26 February (New style: March 11), 1914) was a Russian geographer and statistician who managed the Russian Geographical Society for more than 40 years.
Pyotr Stolypin Pyotr Arkadyevich Stolypin (Russian: Пётр Арка́дьевич Столы́пин) (April 14 (April 2 Old Style) 1862 - September 18 (September 5 Old Style) 1911) served as Nicholas II's Chairman of the Council of Ministers (Prime Minister) from 1906 to 1911. He became known for his heavy-handed attempts to battle revolutionary groups and for instituting the agrarian reform.
Pyotr Vershigora Pyotr Pyotrovich Vershigora or Petro Vershigora (Ukrainian: Вершигора Петро Петрович Russian: Вершигора Пётр Петрович) (May 5, 1905 - March 23, 1963) - Soviet writer and one of the leaders of Soviet partisan movement in Ukraine, Belarus and Poland.
Pyotr Zinchenko Pyotr Ivanovich Zinchenko (Пётр Иванович Зинченко) (1903-1969) was a Soviet developmental psychologist, a student of Lev Vygotsky and Alexei Leontiev and one of the major representatives of the Kharkov School of Psychology. In 1963, Zinchenko founded and headed the department of psychology at Kharkov University until his death in 1969.
PyOgre PyOgre is a Python binding for the OGRE 3D engine, allowing you to use the functionality of OGRE in Python instead of C++. This would allow you to create a functional program at roughly ten times OGRE Alternative Languages page [http://www.
PyPy PyPy is an interpreter for the Python programming language written in Python itself. By enabling Python developers to play with the Python implementation in Python itself (rather than in the reference implementation of the interpreter written in the C programming language), PyPy makes it easy to identify areas where the Python implementation can be improved.
Pyracantha Firethorn (Pyracantha) is a genus of thorny evergreen large shrubs in the family Rosaceae, subfamily Maloideae. They are native from southeast Europe east to southeast Asia, and are closely related to Cotoneaster, but have serrated leaf margins and numerous thorns (Cotoneaster is thornless).
Pyraloidea The Pyraloidea (pyraloid moths) are a moth superfamily containing about 16,000 described species worldwide (Munroe & Solis 1998), and probably at least as many more remain to be described. They are generally fairly small moths.
Pyramid A pyramid is any three-dimensional structure where the upper surfaces are triangular and converge on one point. The base of pyramids are usually quadrilateral or trilateral (but generally it can be any polygon shape), meaning that a pyramid usually has three or four sides (but theoretically there is no limit to the number of sides a pyramid can generally have), but all pyramids must have trilateral sides.
Pyramid (game show) Pyramid was an American television game show where contestants tried to guess a series of words or phrases, based on descriptions that were given to them, in the shortest amount of time. It won nine Daytime Emmys for Outstanding Game Show.
Pyramid (Home game) Pyramid was home game adaptation of the American game show where contestants tried to guess a series of words or phrases, based on descriptions that were given to them, in the shortest amount of time; first published by Milton Bradley in 1974 til 2003 by Endless Games.
Pyramid (magazine) Pyramid is a gaming magazine, publishing articles primarily on role-playing games, but including board games, card games, and other sorts of games. It began life in 1993 as a print publication of Steve Jackson Games for its first 30 issues, though it has been published on the Internet since March 1998.
Pyramid Arena The Pyramid Arena is a 21,000 seat arena located in downtown Memphis at the banks of the Mississippi River. The facility was built in 1991 and is owned and operated jointly by the city of Memphis and Shelby County.
Pyramid Building Society The Pyramid Building Society was an Australian building society, headquartered in Geelong, Victoria which collapsed in 1990 with debts in excess of AUD$2billion. The cost of the collapse to the Victorian taxpayers was estimated at over AUD$900 million, causing a fuel levy of 3c-per-litre to be introduced by the Victorian government to recover funds.
Pyramid Club The Pyramid Club is a nightclub that has been located in the East Village of Manhattan, New York City since 1979, which helped define the East Village scene of the 1980s. The club is located at 101 Avenue A in Manhattan.
Pyramid Dam Pyramid Dam with Pyramid Lake is a part of the California Aqueduct, as is its neighboring Castaic Lake and dam which lies seven miles (10 km) south. Located in northern Los Angeles County, California USA north of Castaic and south of Gorman it is the smaller - relatively speaking - of the two large artificial water storage facilities in the area.
Pyramid Dome Pyramid Dome is a young volcanic dome on one of the flanks on Mount Edziza, British Columbia, Canada. The Dome has just one of the several different styles of volcanic activity on the Mount Edziza complex and is located in the Stikine Volcanic Belt.
Pyramid inch The pyramid inch, infrequently called the sacred Jewish inch, is a unit of measure claimed by pyramidologists to have been used in ancient times. Supposedly it was one twenty-fifth of a "sacred cubit", 1.
Pyramid Mountain (Antarctica) Pyramid Mountain () is a mountain resembling a pyramid, rising to 2,120 m between Turnabout Valley and the mouth of Beacon Valley, in the Quartermain Mountains, Victoria Land. The name seems first to appear on maps of the British Antarctic Expedition (R.
Pyramid of Djoser The Pyramid of Djoser, or kbhw-ntrw (libation of the dieties), was built for the burial of Pharaoh Djoser by his Vizier Imhotep. It was constructed during the 27th century BC at the Saqqara necropolis to the northwest of the city of Memphis.
Pyramid of Khendjer The Pyramid of Khendjer was built for the burial of Pharaoh Khendjer, who ruled Egypt during the 13th Dynasty. Located between the pyramid of Pepi II and and the pyramid of Senusret III in South Saqqara, it was discovered by Gustave Jequier in 1929.
Pyramid of Neferirkare Kakai Pyramid of Neferirkare Kakai is the second pyramid to be built at the necropolis site of Abusir, south of the Giza plateau, in Egypt. The pyramid of Neferirkare is the tallest of all pyramids constructed in Ancient Egypt during its Fifth Dynasty.
Pyramid of the Magician The Pyramid of the Magician is a Mesoamerican step pyramid located in the ancient, Pre-Columbian city of Uxmal, Mexico. The structure is also referred to as the Pyramid of the Dwarf, Casa el Adivino, and the Pyramid of the Soothsayer.
Pyramid of the Sun The Pyramid of the Sun is the largest building in Teotihuacan and one of the largest in Mesoamerica. Found along the Avenue of the Dead, in between the Pyramid of the Moon and the Ciudadela, and in the shadow of the massive mountain Cerro Gordo, the pyramid is part of a large complex in the heart of the city.
Pyramid of Userkaf The Pyramid complex of Userkaf is located in the pyramid field at Saqqara. Constructed in dressed stone, with a core of rubble, the pyramid now resembles a conical hill just to the north of the Step Pyramid of Djoser Netjerikhet (actually inside the enclosure wall).
Pyramid scheme A pyramid scheme is a non-sustainable business model that involves the exchange of money primarily for enrolling other people into the scheme, usually without any product or service being delivered. Pyramid schemes have existed for at least a century.
Pyramid Technology Pyramid Technology was a computer company that produced a number of RISC-based minicomputers at the upper end of the performance range. They also became the second company to ship a multiprocessor Unix system (branded DC/OSx), in 1985, which formed the basis of their product line into the early 1990s.
Pyramid Texts The Pyramid Texts are a collection of Ancient Egyptian religious texts from the time of the Old Kingdom, mostly inscriptions found in pyramids. They depict the Egyptian view of the afterlife, and the ascent into the sky of the divine Pharaoh after death.
Pyramidal alkene Pyramidal alkenes are alkenes in which the two carbon atoms making up the double bond are not coplanar with their four substituents . This deformation from a trigonal planar geometry to a tetrahedral molecular geometry is the result of angle strain induced in the molecule due to geometric constraints.
Pyramidal cell A pyramidal cell (or pyramidal neuron, or projection neuron) is a multipolar neuron located in the hippocampus and cerebral cortex. These cells have a triangularly shaped soma, or cell body, a single apical dendrite extending towards the pial surface, multiple basal dendrites, and a single axon.
Pyramidal number A pyramidal number is a figurate number that represents a pyramid with a base and a given number of sides. The term is most often used to refer to square pyramidal numbers, which have four sides, but it can also refer to:
Pyramidal peak A pyramidal peak, or sometimes in its most extreme form called a glacial horn, is a mountaintop that has been modified by the action of ice during glaciation and frost weathering. If the use is unambiguous within a mountain context, then the simple terms peak or horn may be used.
Pyramidal process of palatine bone The pyramidal process of the palatine bone projects backward and lateralward from the junction of the horizontal and vertical parts, and is received into the angular interval between the lower extremities of the pterygoid plates.
Pyramidellinae Pyramidellinae is one of eleven currently recognised subfamilies of the gastropod family Pyramidellidae; Odostomiinae, Turbonillinae, Chrysallidinae, Cingulininae, Cyclostremellinae, Sayellinae, Syrnolininae, Eulimellinae, Pyramidellinae, Odostomellinae and Tiberiinae. Pyramidellinae was introduced by E Gray in 1840 and includes the genera Pyramidella, Otopleura, Milda and Longchaeus.
Pyramiden Pyramiden (Norwegian, meaning "the pyramid", , piramida) was a Russian settlement and coal mining community on the archipelago of Svalbard, Norway. It was founded by Sweden in 1910, and sold to the Soviet Union in 1927.
Pyramids of the Sun and Moon The Pyramids of the Sun and Moon are the two largest monuments in the ancient Mexican city and religious complex of Teotihuacán. The Pyramid of the Sun is the second largest pyramid in the new world, after the Great Pyramid of Cholula.
Pyranose Pyranose is a collective term for carbohydrates which have a chemical structure that includes a six-membered ring consisting of five carbons and one oxygen. The pyranose ring is formed by the reaction of the C-5 alcohol group of a sugar with its C-1 aldehyde forming an intramolecular hemiacetal.
Pyraustinae Pyraustinae is a large subfamily of the lepidopteran family Crambidae, the crambid snout moths. It currently includes over 1,400 species, the majority of them tropical but some found in temperate regions including both North America and Europe.
Pyrazole Pyrazole refers both to the class of simple aromatic ring organic compounds of the heterocyclic series characterized by a 5-membered ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions and to the unsubstituted parent compound. Being so composed and having pharmacological effects on humans, they are classified as alkaloids although they are not known to occur in nature.
Pyrénées-Atlantiques Pyrénées-Atlantiques (Gascon: Pirenèus-Atlantics; Basque: Pirinio-Atlantiarrak or Pirinio-Atlantikoak) is a department in the southwest of France which takes its name from the Pyrenees mountains and the Atlantic Ocean.
Pyrenean Ibex The Pyrenean Ibex (Capra pyrenaica pyrenaica) is an ibex, one of the two extinct subspecies of Spanish Ibex. The subspecies once ranged across the Pyrenees in France and Spain and the surrounding area, including the Basque Country, Navarre, and north Catalonia.
Pyrenees The Pyrenees (Catalan: Pirineus; French: Pyrénées; Spanish: Pirineos; Occitan: Pirenèus; Aragonese: Perinés; Basque: Pirinioak) are a range of mountains in southwest Europe that form a natural border between France and Spain. They separate the Iberian Peninsula from France, and extend for about 430 km (267 mi) from the Atlantic Ocean (Bay of Biscay) to the Mediterranean Sea (Cap de Creus).
Pyrenees Highway The Pyrenees Highway in western Victoria, Australia (state route B180) is a highway serving to link the Glenelg Highway to the east of Hamilton with the Midland and Calder Highways in or near Castlemaine, south of Bendigo. It intersects with the region's major freight route - the Western Highway - in Ararat.
Pyrenoid In cell biology, pyrenoids are centers of carbon dioxide fixation within the chloroplasts of algae and hornworts. Pyrenoids are not membrane-bound organelles, but specialized areas of the plastid that contain high levels of ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO).
Pyrgi Tablets The Pyrgi Tablets, found in an excavation of a sanctuary of that town in Italy, a port of the southern Etruscan town of Caere, are three golden leaves that record a dedication made around 500 BC by Thefarie Velianas, king of Caere, to the Phoenician goddess ‘Ashtart.
Pyribenzamine Tripellenamine (Pyribenzamine) is a first generation antihistamine. It can be used in the treatment of asthma, hay fever, rhinitus and urticaria but is now less common as it has been replaced by newer antihistamines.
Pyridinium chlorochromate Pyridinium chlorochromate, a reddish orange solid reagent, is used to oxidize primary alcohols to aldehydes and secondary alcohols to ketones. Pyridinium chlorochromate, or PCC, will not fully oxidize the alcohol to the carboxylic acid as does the Jones reagent.
Pyridoxal Pyridoxal is one of the three natural forms of vitamin B6, along with pyridoxamine and pyridoxine (also called "pyridoxol"). All of these forms are converted in the human body into a single biologically active form, pyridoxal 5-phosphate.
Pyridoxal-phosphate Pyridoxal-phosphate (PLP, pyridoxal-5'-phosphate) is a cofactor of many enzymatic reactions. It is the active form of vitamin B6 which comprises three natural organic compounds, pyridoxal, pyridoxamine and pyridoxine.

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