yellow fever: The course of the disease: …the yellow fever virus: (1) urban, or classical, yellow fever, in which transmission is from person to person via the “domestic” (i.e., urban-dwelling) Aedes aegypti mosquito; (2) jungle, or sylvatic, yellow fever, in which transmission is from a mammalian host (usually a monkey) to humans via any one of a…

theatre: Developments in the United States: …was represented by the Viennese Joseph Urban, who when he went to the Boston Opera before World War I took with him an entire atelier of draftsmen and scenic artists. Urban moved into musical comedy and eliminated the acreage of painted vistas and box sets that had been manufactured by…

Keith Urban is a New Zealand-born Australian singer, songwriter, and guitarist who earned recognition both inside and outside the country music sphere for his pop-rock influences and honest lyrics. Urban moved with his family from New Zealand to Queensland, Australia, when he was two years old.

Keith Urban is a New Zealand-born Australian singer, songwriter, and guitarist who earned recognition both inside and outside the country music sphere for his pop-rock influences and honest lyrics. Urban moved with his family from New Zealand to Queensland, Australia, when he was two years old.

religious experience: Study and evaluation: Hocking, and Wilbur M. Urban represented an idealist tradition in interpreting religion, stressing the concepts of purpose, value, and meaning as essential for understanding the nature of God. Naturalist philosophers, of whom John Dewey was typical, have focused on the “religious” as a quality of experience and…

Urbana, city, Champaign county, west-central Ohio, U.S., in a stock-raising and farming area, 40 miles (64 km) northeast of Dayton. Laid out in 1805 by Col. William Ward of Virginia, it became the county seat in the same year and grew after a training camp was established there by Gen. William Hull

Urbana, city, seat (1833) of Champaign county, east-central Illinois, U.S. Urbana is contiguous with Champaign (west), about 135 miles (220 km) southwest of Chicago. The two cities are often called Champaign-Urbana. The area was first settled in 1822, and in 1833 the city was founded as the county

urbanization, the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities. The definition of what constitutes a city changes from time to time and place to place, but it is most usual to explain the term as a matter of demographics. The

Poor Clare: …came to be called the Urbanist Poor Clares or officially the Order of St. Clare (O.S.C.), whereas those communities who continued to observe the stricter rule of St. Clare (as revised in 1253) became known as the Primitives.

urbanization, the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities. The definition of what constitutes a city changes from time to time and place to place, but it is most usual to explain the term as a matter of demographics. The

Hungary: Charles III and Maria Theresa: …introduced some improvements (notably the Urbarial Patent in 1767, which attempted to standardize peasant holdings and obligations), followed their masters in aspiring to nothing more than as much material comfort as could be obtained with a minimum of effort. The national language itself was becoming little more than a peasant…

Karl Gutzkow: Gutzkow also wrote Das Urbild des Tartüffe (1844; “The Model for Tartuffe”), a clever and topical satirical comedy; and Uriel Acosta (1846), which uses the story of the martyrdom of that forerunner of Spinoza to make a plea for religious freedom. By this time he had published the…

Erbil, city, capital of Erbil muḥāfaẓah (governorate), northern Iraq. The city is also the capital of the Kurdistan Regional Government (KRG) in Iraq and is among the largest cities in that country. It is one of the most ancient cities in the world, dating back at least to 2300 bce. Erbil has long

Lope de Vega: Life: …incredible court scandal, Vega abducted Isabel de Urbina (the “Belisa” of many of his poems), the beautiful 16-year-old sister of Philip II’s earl marshal. They were forced to marry, and the new husband immediately departed with the Spanish Armada against England. On his return, he passed the remainder of his…

Urbino, town, Marche (the Marches) regione (region), central Italy. Founded by the Umbrians, an ancient people of Italy, it was subsequently occupied by the Etruscans, Celts, and Gauls and, in the 3rd century bce, by the Romans. It eventually fell under church rule in the 9th century but was ceded

Urbino majolica, Italian tin-glazed earthenware made in the city of Urbino, which from about 1520 dominated the market. Early wares, mostly dishes, are decorated with narrative scenes that typically cover the entire surface. The narrative scenes are taken from the Bible, from Classical mythology,

Urbino majolica, Italian tin-glazed earthenware made in the city of Urbino, which from about 1520 dominated the market. Early wares, mostly dishes, are decorated with narrative scenes that typically cover the entire surface. The narrative scenes are taken from the Bible, from Classical mythology,

Lorenzo di Piero de’ Medici, duca di Urbino was the ruler of Florence from 1513 to 1519, to whom Niccolò Machiavelli addressed his treatise The Prince, counselling him to accomplish the unity of Italy by arming the whole nation and expelling its foreign invaders. Lorenzo’s father, Piero, son of

Urbino, town, Marche (the Marches) regione (region), central Italy. Founded by the Umbrians, an ancient people of Italy, it was subsequently occupied by the Etruscans, Celts, and Gauls and, in the 3rd century bce, by the Romans. It eventually fell under church rule in the 9th century but was ceded

Toyo Ito: …he established his own practice, Urban Robot (URBOT), in Tokyo, initially focusing on residential and other small-scale projects. One of his most notable early designs was the White U house (1976) in Tokyo. Intended as a place of solace and retreat for Ito’s recently widowed sister, the house—built in the…

Leipzig, city, western Saxony Land (state), east-central Germany. It lies just above the junction of the Pleisse, Parthe, and Weisse Elster rivers, about 115 miles (185 km) southwest of Berlin. Leipzig is situated in the fertile, low-lying Leipzig Basin, which has extensive deposits of lignite

Orvieto, town, Umbria regione, central Italy. The town is situated atop an isolated rock 640 feet (195 m) above the junction of the Paglia and Chiana rivers. An Etruscan and later a Roman city (in late Roman times it was called Urbs Vetus, from which its Italian name is derived), Orvieto was the

Sir Thomas Urquhart was a Scottish author best known for his translation of the works of François Rabelais, one of the most original and vivid translations from any foreign language into English. Urquhart studied at King’s College, Aberdeen, and fought against the Covenanters at Turriff (1639). He

urchin, any of several marine invertebrates of the class Echinoidea (phylum Echinodermata), including the cake urchin, heart urchin, and sea urchin

Urci, ancient settlement in southeastern Roman Hispania mentioned by Pomponius Mela, Pliny the Elder, and Claudius Ptolemy. The writings of these historians indicate that the city was located in the hinterland of what is now Villaricos, Spain, in the lower basin of the Almanzora

Norn: Some sources name them Urd, Verdandi, and Skuld, perhaps meaning “past,” “present,” and “future.” They were depicted as living by Yggdrasill, the world tree, under Urd’s well and were linked with both good and evil. Being frequently attendant at births, they were sometimes associated with midwifery. The name Norn…

Andrés de Urdaneta was a navigator whose discovery of a favourable west-to-east route across the Pacific made colonization of the Philippines and transpacific commerce possible. As a young man, Urdaneta spent eight adventurous years in the Spice Islands (Moluccas) and then, in 1553, entered the

Norn: …Yggdrasill, the world tree, under Urd’s well and were linked with both good and evil. Being frequently attendant at births, they were sometimes associated with midwifery. The name Norn appears only in Scandinavian sources, but the cult of Nornlike beings occurs in several European folklores. In Norse literature the Norns…

Urdu language, member of the Indo-Aryan group within the Indo-European family of languages. Urdu is spoken as a first language by nearly 70 million people and as a second language by more than 100 million people, predominantly in Pakistan and India. It is the official state language of Pakistan and

Urdu literature, writings in the Urdu language of the Muslims of Pakistan and northern India. It is written in the Perso-Arabic script, and, with a few major exceptions, the literature is the work of Muslim writers who take their themes from the life of the Indian subcontinent. Poetry written in

Jordan, Arab country of Southwest Asia, in the rocky desert of the northern Arabian Peninsula. Jordan is a young state that occupies an ancient land, one that bears the traces of many civilizations. Separated from ancient Palestine by the Jordan River, the region played a prominent role in biblical

Jordan River, river of southwestern Asia, in the Middle East region. It lies in a structural depression and has the lowest elevation of any river in the world. The river rises on the slopes of Mount Hermon, on the border between Syria and Lebanon, and flows southward through northern Israel to the

Jordan, Arab country of Southwest Asia, in the rocky desert of the northern Arabian Peninsula. Jordan is a young state that occupies an ancient land, one that bears the traces of many civilizations. Separated from ancient Palestine by the Jordan River, the region played a prominent role in biblical

Irvin Kershner: From B-24s to Laura Mars: …married couple Robert Shaw and Mary Ure as husband and wife; and A Fine Madness (1966) featured Sean Connery as an irreverent poet whose outbursts of violence earn him a lobotomy. In 1967 Kershner directed The Flim-Flam Man, a profile of a Southern con man played by George C. Scott.

Live Aid: …Bob Geldof and Ultravox vocalist Midge Ure, the event drew an estimated 1.5 billion television viewers and raised millions of dollars for famine relief in Ethiopia.

urea, the diamide of carbonic acid. Its formula is H2NCONH2. Urea has important uses as a fertilizer and feed supplement, as well as a starting material for the manufacture of plastics and drugs. It is a colourless, crystalline substance that melts at 132.7° C (271° F) and decomposes before

Ouvéa Island, northernmost of the Loyalty Islands, an island group within the French overseas country of New Caledonia, southwestern Pacific Ocean. Ouvéa is a crescent-shaped atoll, 30 miles (50 km) long and 4.5 miles (7 km) wide. The most fertile of the group, it is wooded and produces copra for

Sir Hans Adolf Krebs: …reactions (now known as the urea cycle) by which ammonia is converted to urea in mammalian tissue; the urea, far less toxic than ammonia, is subsequently excreted in the urine of most mammals. This cycle also serves as a major source of the amino acid arginine.

chondrichthyan: Salt and water balance: …blood, an ability termed the urea retention habitus. The concentration within the body thus exceeds that of the surrounding seawater, and water moves into the body with no expenditure of energy. When any of these fishes moves into fresh water, as many do, the urine flow to the outside increases;…

urea-formaldehyde resin, any of a class of synthetic resins obtained by chemical combination of urea (a solid crystal obtained from ammonia) and formaldehyde (a highly reactive gas obtained from methane). Urea-formaldehyde resins are used mostly as adhesives for the bonding of plywood,

infectious disease: Mycoplasmas and ureaplasmas: Mycoplasmas and ureaplasmas, which range in size from 150 to 850 nanometers, are among the smallest known free-living microorganisms. They are ubiquitous in nature and capable of causing widespread disease, but the illnesses they produce in humans are generally milder than those caused by…

urease, an enzyme that catalyzes the hydrolysis of urea, forming ammonia and carbon dioxide. Found in large quantities in jack beans, soybeans, and other plant seeds, it also occurs in some animal tissues and intestinal microorganisms. Urease is significant in the history of enzymology as the first

meteorite: Achondrites: …class of asteroid-derived achondrites, the ureilites, are carbon-bearing. They consist of a silicate rock, made primarily of the minerals olivine and pyroxene, that has dark veins running through it. The veins, which constitute as much as 10 percent of the meteorites, are composed of carbon (graphite and some diamond), nickel-iron…

uremia, medical condition produced by the toxic effects of abnormally high concentrations of nitrogenous substances in the blood as a result of the kidney’s failure to expel waste products by way of the urine. The end products of protein metabolism accumulate in the blood but are normally filtered

urena, (Urena lobata), plant of the family Malvaceae; its fibre is one of the bast fibre group. The plant, probably of Old World origin, grows wild in tropical and subtropical areas throughout the world. Urena has long been used for its fibre in Brazil, but it has been slow in achieving importance

urena, (Urena lobata), plant of the family Malvaceae; its fibre is one of the bast fibre group. The plant, probably of Old World origin, grows wild in tropical and subtropical areas throughout the world. Urena has long been used for its fibre in Brazil, but it has been slow in achieving importance

Abdul Qadeer Khan: …of the Dutch partner of URENCO. URENCO, a consortium of British, German, and Dutch companies, was established in 1971 to research and develop uranium enrichment through the use of ultracentrifuges, which are centrifuges that operate at extremely high speeds. Khan was granted a low-level security clearance, but, through lax oversight,…

natural gas: Russia: …second largest gas field is Urengoy, which was discovered there in 1966 and was estimated to have initial reserves as great as 8.1 tcm (286 tcf). Roughly three-quarters of this gas is found in the shallowest reservoir, 1,100 to 1,250 metres (3,600 to 4,100 feet) deep, which is Late Cretaceous…

Banks Islands: The northernmost islet, Uréparapara, is a volcanic cone that has been breached by the sea, thus creating Lorup Bay in its east coast. Several of the islands have active volcanoes. The islands’ inhabitants, who are mostly Melanesians, cultivate copra and coffee for export. There are airstrips on Mota…

Rosales: Characteristic morphological features: Members of the tribe Urereae (also known as Urticeae) are among the most conspicuous members of the family Urticaceae (the nettle family) because of their stinging hairs. The stings are frequently a short-term irritant, but contact with some species can cause pain or numbness that lasts for several days.…

ureter, duct that transmits urine from the kidney to the bladder. There normally is one ureter for each kidney. Each ureter is a narrow tube that is about 12 inches (30 cm) long. A ureter has thick contractile walls, and its diameter varies considerably at different points along its length. The

atresia and stenosis: Ureteric and urethral atresias and stenoses cause distension of the urinary tract above the obstruction, with impairment of kidney function and often infection.

animal development: Excretory organs: …the mesonephric duct, called the ureteric bud. The ureteric bud grows in the direction of the mesenchyme and becomes the ureter. Having penetrated the mass of mesenchyme, it starts to branch, producing the collecting tubules of the kidney; the mesenchyme, meanwhile, in response to the influence of the duct and…

atresia and stenosis: and urethral atresias and stenoses cause distension of the urinary tract above the obstruction, with impairment of kidney function and often infection.

urostomy, the surgical formation of a new channel for urine and liquid wastes following the removal of the bladder or ureters. See

urethra, duct that transmits urine from the bladder to the exterior of the body during urination. The urethra is held closed by the urethral sphincter, a muscular structure that helps keep urine in the bladder until voiding can occur. Because the urethra is anatomically linked with the reproductive

atresia and stenosis: Ureteric and urethral atresias and stenoses cause distension of the urinary tract above the obstruction, with impairment of kidney function and often infection.

urethral gland, in male placental mammals, any of the glands that branch off the internal wall of the urethra, the passageway for both urine and semen. The glands contribute mucus to the seminal fluid. They are located along the whole length of the urethra but are most numerous along the section of

atresia and stenosis: Ureteric and urethral atresias and stenoses cause distension of the urinary tract above the obstruction, with impairment of kidney function and often infection.

renal system disease: Obstruction: …of the urethral wall (urethral stricture); and by congenital valve or diaphragm (membranous malformation). Although not a part of the excretory tract, the prostate lies close to the bladder neck, and in older men it is an important cause of obstruction; fibrous disease of the bladder neck can also…

urethritis, infection and inflammation of the urethra, the channel for passage of urine from the urinary bladder to the outside. Urethritis is more frequent in males than in females. The causes of urethritis vary with age, sexual practices, and hygienic standards. Urethritis due to fecal

Urewera National Park, park in northeastern North Island, New Zealand. Established in 1954, it has an area of 821 square miles (2,127 square km) and has the largest expanse of indigenous forest in the North Island. The park is located in a region between Wairoa and Rotorua, remote from European

Harold C. Urey was an American scientist awarded the Nobel Prize for Chemistry in 1934 for his discovery of the heavy form of hydrogen known as deuterium. He was a key figure in the development of the atomic bomb and made fundamental contributions to a widely accepted theory of the origin of the

Harold C. Urey was an American scientist awarded the Nobel Prize for Chemistry in 1934 for his discovery of the heavy form of hydrogen known as deuterium. He was a key figure in the development of the atomic bomb and made fundamental contributions to a widely accepted theory of the origin of the

pyroxene: Chemical composition: include johannsenite [CaMnSi2O6], and kosmochlor (ureyite) [NaCrSi2O6]. Johannsenite involves the substitution of manganese for iron in hedenbergite. Kosmochlor has chromium (Cr) in place of iron or aluminum in a sodic pyroxene.

Yemen: Justice: …of Sharīʿah (Islamic law) and ʿurf (tribal custom). In the south the legal system was a mixture of Sharīʿah in matters of personal status (e.g., marriage, divorce, inheritance) and British commercial and common law (modified to suit the needs of the Marxist government) and, in rural areas, a combination of…

Şanlıurfa, city, southeastern Turkey. It lies in a fertile plain and is ringed by limestone hills on three sides. The city, of great age, controls a strategic pass to the south through which runs a road used since antiquity to travel between Anatolia and northern Mesopotamia. The modern name

Honoré d’ Urfé was a French author whose pastoral romance L’Astrée (1607–27; Astrea) was extremely popular in the 17th century and inspired many later writers. D’Urfé was born into a family of ancient nobility. He grew up in the Forez region of southeastern France and was educated at the Collège de

Islamic arts: Indian literature in Persian: ʿUrfī, who left Shīrāz for India and died in his mid-30s in Lahore (1592), is without doubt one of the few genuine masters of Persian poetry, especially in his qaṣīdahs. His verses pile up linguistic difficulties, yet their dark, glowing quality cannot fail to touch…

Ulaanbaatar, capital and largest city of Mongolia. It is situated on the Tuul River on a windswept plateau at an elevation of 4,430 feet (1,350 metres). The city originated as a seasonal migratory abode of the Mongolian princes and in 1639 finally attained permanence on the present site with the

Urgench, city, south-central Uzbekistan. The city lies along the Shavat Canal and the Amu Darya (river). Urgench was founded when the inhabitants of the ancient city of Urgench, near present-day Kunya-Urgench, 80 miles (130 km) to the northwest, moved there in the mid-17th century because of their

Robert Bly: …the Insatiable Soul (1994) and The Urge to Travel Long Distances (2005) are preoccupied with the pastoral landscape of Minnesota. Bly employed the Arabic ghazal form in the poems comprising The Night Abraham Called to the Stars (2001) and My Sentence Was a Thousand Years of Joy (2005). He also…

geochronology: Classification of stratified rocks: …a successionally lowest category, the Primary (Urgebirge), composed mainly of crystalline rocks, (2) an intermediate category, or the Secondary (Flötzgebirge), composed of layered or stratified rocks containing fossils, and (3) a final or successionally youngest sequence of alluvial and related unconsolidated sediments (Angeschwemmtgebirge) thought to represent the most recent record…

Urgench, city, south-central Uzbekistan. The city lies along the Shavat Canal and the Amu Darya (river). Urgench was founded when the inhabitants of the ancient city of Urgench, near present-day Kunya-Urgench, 80 miles (130 km) to the northwest, moved there in the mid-17th century because of their

Urgench, city, south-central Uzbekistan. The city lies along the Shavat Canal and the Amu Darya (river). Urgench was founded when the inhabitants of the ancient city of Urgench, near present-day Kunya-Urgench, 80 miles (130 km) to the northwest, moved there in the mid-17th century because of their

Russia: Tatar rule: …former kingdom of Khwārezm, including Urgench, the cultural capital of the Jucids. Control of the Slavic lands was exercised through the native princes, some of whom spent much of their time at the Mongol capital, and through agents charged with overseeing the activities of the princes and particularly the fiscal…

Claudius: Early life: …original material: his first wife, Plautia Urgulanilla, had Etruscan blood, and her family was probably able to put Claudius in touch with authentic Etruscan traditions. After divorcing Urgulanilla, he in turn married Aelia Paetina, Valeria Messalina, who was his wife at his accession, and, finally, Agrippina the Younger. By his…

Şanlıurfa, city, southeastern Turkey. It lies in a fertile plain and is ringed by limestone hills on three sides. The city, of great age, controls a strategic pass to the south through which runs a road used since antiquity to travel between Anatolia and northern Mesopotamia. The modern name

Hattusilis III: …overthrowing his nephew Urhi-Teshub (Mursilis III).

Anatolia: The neo-Hittite states from c. 1180 to 700 bce: …king with the Hurrian name Urhilinas—one of the leaders of the coalition against Assyria in 853—records that he has built a throne and erected a monument for the Semitic goddess Bahalatis. Another contemporary of Shalmaneser III was Halpa-Runtiyas of Patina, whose name has also been found in the Hieroglyphic Luwian…

Urhobo, a people of the northwestern part of the Niger River delta in extreme southern Nigeria. They speak a language of the Benue-Congo branch of the Niger-Congo language family. The term Sobo is used by ethnographers as a cover term for both the Urhobo and their neighbours, the Isoko, but the two

URL: …the above example is a URI (Uniform Resource Identifier) fragment. The number sign, known in this context as an anchor, acts like a bookmark within the resource, instructing the Web browser to show the content at that particular point. For example, a number sign followed by a word is an…

Uri, canton, central Switzerland, traversed by the steep-sided valleys of the Reuss River and its tributaries. About one-half of the canton’s area is reckoned as productive. Forests occupy part of the canton, and more than 20 percent of the unproductive area in Uri is covered with glaciers. The

Democratic Party of Korea: …and Roh’s supporters established the Uri Party in 2003. In the 2004 elections the MDP retained only 9 seats in the National Assembly, while the Uri Party captured a majority, winning 152 of a possible 299 seats. Just prior to the parliamentary elections, the MDP sided with the conservative GNP…

murre, any of certain black and white seabirds comprising the genus Uria of the auk family, Alcidae. In British usage the two species of Uria are called guillemots, along with Cepphus species. Murres are about 40 cm (16 inches) long. They nest in vast numbers on sheer cliffs, each pair laying a

murre: The common murre (U. aalge) breeds from the Arctic Circle south to Nova Scotia, California, Portugal, and Korea. Atlantic populations include the so-called bridled, or ringed, murre, a mutation that shows, in breeding season, a ring around the eye and a thin, white stripe behind the…

murre: The thick-billed, or Brünnich’s, murre (U. lomvia), with a somewhat heavier beak, often nests farther north, to Ellesmere Island and other islands within the Arctic Circle, where the common murre is absent. There is some overlap in breeding grounds, however, and the two species nest in…

Bathsheba: …Kings 1, 2), wife of Uriah the Hittite; she later became one of the wives of King David and the mother of King Solomon.

urial, (Ovis orientalis), medium-size, rather stout-bodied wild sheep, distributed from northwest India and Ladakh to southwest Russia, Afghanistan, Pakistan, and Iran. Six to nine subspecies are usually recognized; they differ in the colour and size of the winter neck-ruff of males, as well as in

China: Foreign relations: …Chengde area known as the Urianghad tribes. The Urianghad tribes surrendered to the Hongwu emperor and were incorporated into China’s frontier defense system under a Chinese military headquarters. Because they served the Yongle emperor as a loyal rear guard during his seizure of the throne, he rewarded them with virtual…

Tyvan, any member of an ethnolinguistic group inhabiting the autonomous republic of Tyva (Tuva) in south-central Russia; the group also constitutes a small minority in the northwestern part of Mongolia. The Tyvans are a Turkic-speaking people with Mongol influences. They live among the headwaters

Álvaro Uribe is a Colombian politician who served as president of Colombia (2002–10). Uribe earned a law degree from the University of Antioquia, Medellín, and later studied management and administration at Harvard University. In the mid-1970s he worked in the state government of Antioquia before

Álvaro Uribe is a Colombian politician who served as president of Colombia (2002–10). Uribe earned a law degree from the University of Antioquia, Medellín, and later studied management and administration at Harvard University. In the mid-1970s he worked in the state government of Antioquia before

Latin American art: Trends, c. 1970–present: Juan Camilo Uribe of Colombia combined a Sacred Heart print with another of an admired Venezuelan doctor to create his own collage valentine in Declaration of Love to Venezuela (1976).

The War of a Thousand Days: …two most important Liberal leaders, Rafael Uribe Uribe and Benjamín Herrera, surrendered after negotiating peace treaties promising amnesty, free elections, and political and monetary reform. Panama seceded soon after the war.

José Evaristo Uriburu was an Argentine statesman who was his country’s president in 1895–98. Born into an old aristocratic family, Uriburu earned his doctoral degree in law in 1854 and then entered public life. He served in various government positions and held important diplomatic posts in several

José Félix Uriburu was an Argentine soldier who led the military coup that in September 1930 overthrew the liberal regime of President Hipólito Irigoyen and restored the old landed oligarchy to the political power it had lost after the revolution of 1916. Uriburu was a member of the Argentine

uric acid, a compound belonging to the purine group, and the chief form in which nitrogen, resulting from the breakdown of protein during digestion, is excreted by reptiles and birds. Small quantities of uric acid (about 0.7 gram per day) are excreted by humans as a product of the breakdown of

Longmyndian: …as the Eastern and Western Uriconian, geographically separated from each other but similar in lithology and probably broadly contemporaneous. The Eastern and Western Uriconian consist of lavas, tuffs, and intrusive igneous bodies; they are separated from the overlying Stretton Series by a prominent unconformity. Elsewhere, in the Charnwood Forest and…

metabolism: Pyrimidine ribonucleotides: …the phosphorylation of UMP to UDP and thence to UTP by interaction with two molecules of ATP. Uridine triphosphate (UTP) can be converted to the other pyrimidine building block of RNA, cytidine triphosphate (CTP). In bacteria, the nitrogen for this in reaction [74] is derived from ammonia; in higher animals,…