river in northeastern New Hampshire and southern Maine, U.S. It flows south from Umbabog Lake to Gorham, N.H., east to Jay, Maine, and then south again to the Atlantic Ocean. In its 175-mile (280-kilometre) course, the river descends more than 1,245 feet (379 m), the two steepest drops occurring at ...
(from the article "steroid") ...classes of natural steroids are alike, except at the junction of rings A and B. Simplified three-dimensional diagrams may be used to illustrate stereochemical details. For example, androstane, common to a number of natural and synthetic steroids, exists in two forms (2 and 3), in which the A/B ring fusions ...
(from the article "steroid") Androgens promote male sexual behaviour and aggressiveness, muscular development, and, in humans, the growth of facial and body hair and deepening of the voice. Testosterone and androstenedione are the principal androgens of the testes. Testosterone is more potent than androstenedione, but in the sexual tissues it appears to be converted ...
(from the article "testosterone") ...masculine characteristics as facial hair and deepening of the voice. The hormone was isolated from testicular extracts in 1935, after it had been shown that they contain an androgen more potent than androsterone, which had been obtained from urine in 1931. Androsterone was later shown to be a biochemical product ...
(from the article "American Association of Retired Persons") The AARP was founded in 1958 by a retired teacher, Ethel Percy Andrus, with the goal of helping older Americans remain physically and intellectually active by serving others. In 1982 the AARP merged with the National Retired Teachers Association (NRTA), an organization that Andrus had founded in 1947 to obtain ...
(from the article "Deere, John") ...33 years old, he headed west and eventually settled in Grand Detour, Ill., where he set up a blacksmith's shop, and sent for his wife and children the following year. He joined in a partnership with Major Leonard Andrus.
(Jan. 30 [Feb. 9, New Style], 1667), long-lasting treaty that ended the Thirteen Years' War (1654-67) between Russia and Poland for control of Ukraine. In 1654 the Russian government accepted the Pereyaslav Agreement, a proposal to annex Ukraine made by the hetman (military leader) of the Zaporozhian Cossacks, Bohdan Khmelnytsky, ... [6 Related Articles]
Polish novelist, short-story writer, and political dissident noted for his attention to moral issues important in 20th-century Poland and for his realistic fiction. [2 Related Articles]
By 2007 it was clear that pianist Leif Ove Andsnes was practically a hero in Norway and effectively his country's musical ambassador to the world. In August he received the Peer Gynt Prize, awarded by the Norwegian Storting (parliament) to individuals in recognition of their contributions in politics, sports, and ...
city, Jaen provincia (province), in the comunidad autonoma (autonomous community) of Andalusia, southern Spain, northwest of Jaen city, on the Guadalquivir River. Called Isturgi, or Ilurgia, by the Celto-Iberians, it was besieged and captured by the Roman general Scipio Africanus the Elder (206 BC) ...
American television comedy series that aired on the Columbia Broadcasting System (now CBS Corporation) from 1960 to 1968. During its entire run, the show rated no worse than seventh in the seasonal Nielsen ratings and held the number one spot when it ended.
(from the article "Togo") ...form the major ethnic group. There are also some scattered Yoruba, mainly Ana. Groups who emigrated from present-day Ghana and Cote d'Ivoire since the 17th century include the Mina (Ga and Ane), the Ga-Dangme, the Kpelle and the Anyama, the Chakosi, and the Dagomba. The northern groups-the Kotokoli (or Temba), ...
sound laboratory so designed as to minimize sound reflections as well as external noise. External sound is excluded by physical isolation of the structure, by elaborate acoustical filters in the ventilating ducts, and by thick masonry walls. Interior surfaces are covered with absorptive material, such as glass fibre or mineral ...
one of the British Virgin Islands and the northernmost of the Lesser Antilles, a chain separating the Atlantic Ocean and Caribbean Sea, lying about 80 miles (130 km) east-northeast of Puerto Rico. The island has an area of 15 square miles (39 square km). Annual rainfall averages a moderate 50 ... [2 Related Articles]
channel in the West Indies, connecting the Atlantic Ocean with the Caribbean Sea; it is 40 miles (65 km) wide and separates the British Virgin Islands (west) from the Leeward Islands (southeast). It has the greatest depth (more than 7,550 feet [2,300 m]) of any channel in the eastern Caribbean. ... [1 Related Articles]
town, southern Togo, lying on the Gulf of Guinea near the border of Benin. Founded in the late 17th century by Ane peoples fleeing from Asante attacks in Elmina (now in Ghana), Aneho developed as a slave port and commercial centre. It was the capital of German Togoland from 1885 ... [2 Related Articles]
(from the article "Caudata") ...Batrachoseps, Oedipina, and Lineatriton have reduced limbs and rely mainly on body movements for rapid locomotion. Species of the genus Aneides have arboreal (tree-dwelling) tendencies, and their long legs and digits, expanded toe tips, and prehensile (grasping) tails make them effective climbers. Some salamanders ...
one of five poets renowned among the Welsh in the 6th century, according to the Historia Brittonum (written c. 830). (The other poets are Taliesin, Talhaearn Tad Awen, Blwchbardd, and Cian, whose works are unknown.) Aneirin's reputation rests on a single work, Y Gododdin, preserved in a manuscript known as ... [1 Related Articles]
(from the article "syadvada") ...men feeling an elephant, each of whom concluded that the part he was holding represented the elephant's true form. The relative pluralism of this position is implicit in the Jaina doctrine of anekantavada, or the "many-sidedness of reality." According to this doctrine, all statements can be judged as true or ...
(from the article "fern") ...pair (or, rarely, more) of primary divisions modified, mostly lacking laminar tissue, and densely covered with sporangia; sporangia with the annulus a subapical ring of thickened cells; 1 genus (Anemia) with about 100 species, mostly in the Neotropics.
condition in which the red blood cells (erythrocytes) are reduced in number or volume or are deficient in hemoglobin, their oxygen-carrying pigment. The most noticeable outward symptom of anemia is usually pallor of the skin, mucous membranes, and nail beds. Symptoms of tissue oxygen deficiency include pulsating noises in the ... [17 Related Articles]
(from the article "hypoxia") ...the condition is called anoxia. There are four types of hypoxia: (1) the hypoxemic type, in which the oxygen pressure in the blood going to the tissues is too low to saturate the hemoglobin; (2) the anemic type, in which the amount of functional hemoglobin is too small, and hence ...
(from the article "seed and fruit") ...wind dispersal (although numerically important) reflects the climatic and biotic poverty of certain regions; it is essentially a feature of pioneer vegetations. The flora of the Alps is 60 percent anemochorous, that of the Mediterranean garrigue 50 percent. By making certain assumptions (e.g., for average wind velocity and turbulence) the ...
device for measuring the speed of airflow in the atmosphere, in wind tunnels, and in other gas-flow applications. Most widely used for wind-speed measurements is the revolving-cup electric anemometer, in which the revolving cups drive an electric generator. The output of the generator operates an electric meter that is calibrated ... [2 Related Articles]
any of about 190 species of perennial plants constituting the genus Anemone of the buttercup family (Ranunculaceae). Many colourful varieties of the tuberous poppylike anemone, A. coronaria, are grown for the garden and florist's trade. Popular spring-flowering anemones, especially for naturalizing, are A. apennina, A. blanda, and A. pavonina. Other ...
(from the article "anemone") any of about 190 species of perennial plants constituting the genus Anemone of the buttercup family (Ranunculaceae). Many colourful varieties of the tuberous poppylike anemone, A. coronaria, are grown for the garden and florist's trade. Popular spring-flowering anemones, especially for naturalizing, are A. apennina, A. blanda, and A. pavonina. Other ...
any of about 12 species of Indo-Pacific fishes constituting the genus Amphiprion of the family Pomacentridae (order Perciformes), noted for their association with large sea anemones. Anemone fishes live and shelter among the tentacles of the anemones, swimming in and out unharmed by the stinging cells (nematocysts) that are present ... [1 Related Articles]
(from the article "anemone") The wood anemone of Europe, A. nemorosa, which bears white flowers, causes blistering of the skin and was formerly used as an ingredient in medicines. In North America, wood anemone refers to A. quinquefolia, a delicate plant with deeply cut leaves. Windflower, the English version of the Greek-derived anemone, refers ...
(from the article "anemone") ...wood anemone of Europe, A. nemorosa, which bears white flowers, causes blistering of the skin and was formerly used as an ingredient in medicines. In North America, wood anemone refers to A. quinquefolia, a delicate plant with deeply cut leaves. Windflower, the English version of the Greek-derived anemone, refers to ...
(from the article "mechanoreception") ...snails easily find their particular prey (sea anemones). Similarly among insects, the chemical "smell" of prey or of potential sex partners elicits a tendency to move against the wind (anemotaxis) until the source of the chemical stimulus is found. Several types of air-current receptors (true mechanoreceptors) on the heads of ...
(from the article "malformation") Absence of the brain at birth (anencephaly); an abnormally small brain and head (microcephaly); and enlargement of the brain and head, sometimes to prodigious dimensions due to dilation of the ventricles by fluid (hydrocephaly), are frequent congenital defects in man. In some cases they have been traced to defective genes,...diagnostic ...
one of the leading Roman composers of his time, who succeeded his master, Palestrina, as composer to the Papal Chapel in 1594. Most of Anerio's early works are secular, but he began to concentrate on sacred music after his appointment as papal composer.
(from the article "atmospheric pressure") ...pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer. Atmospheric pressure is also measured using an aneroid barometer, in which the sensing element is one or more hollow, partially evacuated, corrugated metal disks supported against collapse ...
(from the article "conversion disorder") ...have been "converted" into physical symptoms. Sensory disturbances may range from paresthesias ("peculiar" sensations) through hyperesthesias (hypersensitivity) to complete anesthesias (loss of sensation). They may involve the total skin area or any fraction of it, but the disturbances generally do not follow any anatomic distribution of the nervous system. In ...
medical specialty dealing with anesthesia and related matters, including resuscitation and pain. The development of anesthesiology as a specialized field came about because of the dangers of anesthesia, which involves the use of carefully graduated doses of strong poisons to deaden pain. (See anesthetic.) In the 19th century, anesthesia in ... [1 Related Articles]
agent which produces a local or general loss of sensation, including pain. General anesthesia involves loss of consciousness, usually for the purpose of relieving the pain of surgery. Local anesthesia involves loss of sensation in one area of the body by the blockage of conduction in nerves. [24 Related Articles]
(from the article "dog") ...When all signs of discharge and swelling are absent, the heat is complete. The diestrus stage lasts 60 to 90 days (if no pregnancy has occurred) or until the bitch gives birth. She then enters anestrus, which is the time frame between the end of the last cycle and the ...
(from the article "Western architecture") ...in the constructive side of architecture as well as in the theory of design. About 1547 Delorme was commissioned by the mistress of Henry II, Diane de Poitiers, to design her chateau at Anet. The original chateau (about 1547-52) formed three sides of a court closed at the front by ...
(from the article "Huesca") ...Spain. It is bordered by France to the north, Lleida province to the east, and Zaragoza province to the south and west. In the north Huesca province includes the highest point in the Pyrenees, Aneto Peak (11,169 feet [3,404 metres]). Above 8,000 feet (2,440 metres) there is alpine vegetation, giving ...
(from the article "heredity") Some cells have an abnormal number of chromosomes that is not a whole multiple of the haploid number. This condition is called aneuploidy. Most aneuploids arise by nondisjunction, a failure of homologous chromosomes to separate at meiosis. When a gamete of this type is fertilized by a normal gamete, the ...
genus of extinct plants that lived during the Middle and Late Devonian epochs (about 398 to 359 million years ago) and is commonly considered a basal member of the progymnosperms-the probable ancestors of seed plants. The progymnosperms also included Archaeopteris, which was probably the first true tree; however, Aneurophyton had ... [1 Related Articles]
widening of an artery that develops from a weakness or destruction of the medial layer of the blood vessel. Because of the constant pressure of the circulating blood within the artery, the weakened part of the arterial wall becomes enlarged, leading ultimately to serious and even fatal complications from the ... [4 Related Articles]
(from the article "bone cyst") ...femur, or heel bones in children and adolescents and are frequently detected as a result of a fracture. Treatment includes excision of the cyst and a bone graft, but spontaneous healing is common. Aneurysmal bone cysts usually occur in young males and consist of cystic bloody tissue that causes an ...
(from the article "Muhammad I Askia") ...Empire from 1464 to 1492, Muhammad tried, as early as February 1493, to wrest power from Sonni 'Ali's son Sonni Baru, who had been elected by acclamation on January 21. In the Battle of Anfao on April 12, 1493, Muhammad's forces, though inferior in number, were victorious. Paganism tinged with ...
American biochemist who, with Stanford Moore and William H. Stein, received the 1972 Nobel Prize for Chemistry for research clarifying the relationship between the molecular structure of proteins and their biological functions. [1 Related Articles]
(from the article "explosive") The year 1955, marking the beginning of the most revolutionary change in the explosives industry since the invention of dynamite, saw the development of ammonium nitrate-fuel oil mixtures (ANFO) and ammonium nitrate-base water gels, which together now account for at least 70 percent of the high explosives consumption in the ...
(from the article "Ang") in the Khmer language, a person of royal blood, usually translated "prince" or "princess." For articles on such persons, see the personal name; e.g., for Ang Duong, see Duong.
(from the article "Tibet") ...(Nu) River has its source in east-central Tibet, from where it flows through eastern Tibet and Yunnan and then enters Myanmar. The Mekong River begins in southern Tsinghai as two rivers-the Ang and Cha-which join near the Tibet border; the river then flows through eastern Tibet and western Yunnan and ...
(from the article "India") ...conflict, Koshala extended its frontiers far to the south, ultimately coming to comprise Uttar (northern) and Dakshina (southern) Koshala. The new states of Magadha (Patna and Gaya districts) and Anga (northwest of the delta) were also interested in controlling the river and soon made their presence felt. The conflict eventually ...
(from the article "Jaina canon") the sacred texts of Jainism, a religion of India, whose authenticity is disputed between sects. The Svetambara canon consists principally of 45 works divided as follows: (1) 11 Angas, the main texts-a 12th has been lost for at least 14 centuries; (2) 12 Upangas, or subsidiary texts; (3) 10 Prakirnakas, ...
