coulomb, unit of electric charge in the metre-kilogram-second-ampere system, the basis of the SI system of physical units. It is abbreviated as C. The coulomb is defined as the quantity of electricity transported in one second by a current of one ampere. Named for the 18th–19th-century French

c, third letter of the alphabet, corresponding to Semitic gimel (which probably derived from an early sign for "camel") and Greek gamma (Γ). A rounded form occurs at Corinth and in the Chalcidic alphabet, and both an angular and a rounded form are found in the early Latin alphabet, as well as in

c, third letter of the alphabet, corresponding to Semitic gimel (which probably derived from an early sign for "camel") and Greek gamma (Γ). A rounded form occurs at Corinth and in the Chalcidic alphabet, and both an angular and a rounded form are found in the early Latin alphabet, as well as in

C, third note of the musical alphabet, and one which has always occupied a peculiarly distinctive position in that it is the keynote of what was once called the natural scale. Thus on the pianoforte it consists entirely of white notes and hence has come to be regarded as the simplest and most

C, computer programming language developed in the early 1970s by American computer scientist Dennis M. Ritchie at Bell Laboratories (formerly AT&T Bell Laboratories). C was designed as a minimalist language to be used in writing operating systems for minicomputers, such as the DEC PDP 7, which had

curie, in physics, unit of activity of a quantity of a radioactive substance, named in honour of the French physicist Pierre Curie. (Even though the committee that named the unit in 1910 said it honoured Pierre Curie, some committee members later said the unit was in honour of both Pierre and Marie

speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. The speed of light is considered a fundamental constant of nature. Its significance is far broader

carbon (C), nonmetallic chemical element in Group 14 (IVa) of the periodic table. Although widely distributed in nature, carbon is not particularly plentiful—it makes up only about 0.025 percent of Earth’s crust—yet it forms more compounds than all the other elements combined. In 1961 the isotope

Celsius, scale based on 0° for the freezing point of water and 100° for the boiling point of water. Invented in 1742 by the Swedish astronomer Anders Celsius, it is sometimes called the centigrade scale because of the 100-degree interval between the defined points. The following formula can be used

radar: Doppler weather radar: 65 GHz (C band) to avoid interference with the lower frequencies of Nexrad and ASR systems.

calcitonin: …and other mammals primarily by parafollicular cells (C cells) in the thyroid gland. In birds, fishes, and other nonmammalian vertebrates, calcitonin is secreted by cells of the glandular ultimobranchial bodies. The overall effect of calcitonin is to lower the concentration of calcium in the blood when it rises above the…

clef: The C clef, or movable C clef, determines the position of middle C. It is commonly found in two principal positions: as an alto clef (standard for the viola), in which the middle line carries C:

William Steig: …Steig created the letter-puzzle book C D B! and the story Roland the Minstrel Pig (both 1968). He won the 1970 Caldecott Medal for his next book, Sylvester and the Magic Pebble (1969), about a donkey who finds a wish-granting rock.

soil: Soil horizons: …and B horizons is the C horizon, a zone of little or no humus accumulation or soil structure development. The C horizon often is composed of unconsolidated parent material from which the A and B horizons have formed. It lacks the characteristic features of the A and B horizons and…

Saturn: The ring system: …the third major ring, the C ring (sometimes known as the crepe ring), at 1.23 to 1.52 Saturn radii, with optical depths near 0.1. Interior to the C ring at 1.11 to 1.23 Saturn radii lies the extremely tenuous D ring, which has no measurable effect on starlight or radio…

solid-waste management: Composition and properties: Construction and demolition (C&D) waste (or debris) is a significant component of total solid waste quantities (about 20 percent in the United States), although it is not considered to be part of the MSW stream. However, because C&D waste is inert and nonhazardous, it is…

Chicago and North Western Transportation Company (C&NW), former American railroad that was once one of the largest in the Midwest. The railroad was incorporated in 1859 as a successor to the foreclosed Columbus, Hocking Valley and Toledo Railway. Its first president was William Butler Ogden, the

Chesapeake and Ohio Railway Company (C&O), American railroad company established in 1868 with the consolidation of two smaller lines, the Virginia Central and the Covington and Ohio. It subsequently acquired a number of other lines, culminating in its merger with the Pere Marquette Railroad Company

Chesapeake and Ohio Canal, former waterway, extending 297 km (184.5 miles) along the east bank of the Potomac River between Washington, D.C., and Cumberland in western Maryland. Begun in 1828, the canal was intended to provide cheap transportation between the Atlantic seaports and the Midwest via

Delta Air Lines, Inc.: …one day merge with Delta: Chicago and Southern Air Lines, Inc. (C&S), and Northeast Airlines, Inc. C&S was founded in 1933 as Pacific Seaboard Air Lines. In 1934 it secured a U.S. mail-carrying route from Chicago to New Orleans and was thus incorporated on Dec. 3, 1935, as Chicago and…

Once upon a Time in the West, Italian western film, released in 1968, that was considered by many to be Sergio Leone’s operatic masterpiece. The epic is also notable for Henry Fonda’s playing against type as a villainous killer. Jill (played by Claudia Cardinale) is a mail-order bride who arrives

Olympe Bhêly-Quénum: …novel C’était à Tigony (2000; As She Was Discovering Tigony), in which a geophysicist begins to question her life and views, especially those concerning global capitalism.

Joaquin Phoenix: …gears for his next film, C’mon C’mon (2021), a family drama in which he starred as a radio journalist who is traveling across the United States to interview children. When his young nephew joins him on the road trip, a deep bond develops between the two. In 2023 he starred…

the Sex Pistols: …version of Eddie Cochran’s “C’mon Everybody” became the group’s best-selling single following Vicious’s fatal heroin overdose in New York City in February 1979 while out on bail (charged with the murder of his girlfriend, Nancy Spungen). That same month McLaren was sued by Rotten, and the Sex Pistols disappeared…

Sheryl Crow: Sheryl Crow, The Globe Sessions, and C’mon, C’mon: C’mon, C’mon (2002) featured the hit single “Soak Up the Sun” and the Grammy-winning “Steve McQueen.”

Takashi Murakami: In 2007 ©MURAKAMI was mounted at the Museum of Contemporary Art in Los Angeles, and it subsequently traveled to a number of other major museums, including the Guggenheim Museum in Bilbao, Spain, in 2009. This retrospective exhibit of Murakami’s artistic activity included not only paintings, sculpture, film,…

C++, version of the traditional C programming language augmented with object-oriented programming and other features. C++ is an “intermediate-level” language, meaning that it facilitates “high-level” programming—i.e., in the abstract—and “low-level” programming of actual hardware. This utility at

logistics: New technology: C-141 jet transport, which went into service in 1965, had a 45-ton (40,900-kilogram) capacity and a range of 3,000 miles (4,800 kilometres); it could take an average payload of 24 tons from the U.S. West Coast to South Vietnam in 43 hours and evacuate wounded…

aerospace industry: Military aircraft: …States, Boeing builds the four-turbofan C-17 Globemaster III airlifter. Airbus Military, a subsidiary of Airbus Industrie, manages a multinational group of leading manufacturers in the development of the four-turboprop A400M transport for European air forces. Ukrainian manufacturer Antonov produces several transports, among them the An-225 Mriya, a six-turbofan design originally…

bacteria: Autotrophic metabolism: …the reductive pentose phosphate (Calvin) cycle, the reductive tricarboxylic acid cycle, and the acetyl-CoA pathway. The Calvin cycle, elucidated by American biochemist Melvin Calvin, is the most widely distributed of these pathways, operating in plants, algae, photosynthetic bacteria, and most aerobic lithoautotrophic bacteria. The key step in the Calvin

bacteria: Autotrophic metabolism: …the reductive pentose phosphate (Calvin) cycle, the reductive tricarboxylic acid cycle, and the acetyl-CoA pathway. The Calvin cycle, elucidated by American biochemist Melvin Calvin, is the most widely distributed of these pathways, operating in plants, algae, photosynthetic bacteria, and most aerobic lithoautotrophic bacteria. The key step in the Calvin

Amaranthaceae: Physical description: …that they photosynthesize with a special mechanism of carbon fixation; the family represents the largest collection of plants with that photosynthetic pathway.

Amaranthaceae: Physical description: …that they photosynthesize with a special mechanism of carbon fixation; the family represents the largest collection of plants with that photosynthetic pathway.

C-47, U.S. military transport aircraft that served in all theatres during World War II and continued in service long afterward. It was used to haul cargo, transport troops, drop paratroops, tow gliders, and as a flying ambulance. The C-47 was a military adaptation of the Douglas DC-3, a

aerospace industry: Growth of the aircraft industry: …aircraft at that time, the C-5 Galaxy. Boeing and its engine partner Pratt & Whitney, however, embarked on an ambitious undertaking to develop an aircraft capable of carrying as many as 500 passengers. The end product was the first wide-body passenger jet, the four-engine Boeing 747 Jumbo Jet, which entered…

Justin Trudeau: Early life and start in politics: …the debate and voting on Bill C-51, which was aimed at strengthening existing antiterrorism legislation and expanding the surveillance powers of Canadian security forces in the wake of the separate terrorist attacks in October 2014, in which soldiers were attacked in a Quebec parking lot and at the National War…

William Patterson: develop the DC-4, the first airliner equipped solely for passengers. After retiring as president in 1963, Patterson was elected chairman of the board. He held the position until 1966, when he was named director emeritus and honorary chairman of both United Airlines and its parent company, UAL…

logistics: New technology: …by the new “global logistics” C-5A, with payloads up to 130 tons and ranges up to 5,500 miles. It is estimated that 10 C-5As could have handled the entire Berlin airlift, which employed more than 140 of the then-available aircraft. C-5As played a vital role in the U.S. airlift to…

ice: The ice crystal: …hexagonal rings is termed the c-axis and coincides with the optical axis of the crystal structure.

cytogenetics: banding (Q-banding), reverse banding (R-banding), constitutive heterochromatin (or centromere) banding (C-banding), and fluorescence in situ hybridization (FISH). G-banding is one of the most-used chromosomal staining methods. In this approach, chromosomes are first treated with an enzyme known as trypsin and then with Giemsa stain. All chromosomes can be individually identified…

asteroid: Composition: …25 km [16 km]), the C-class asteroids are the most common, accounting for about 65 percent by number. That is followed, in decreasing order, by the S class, at 15 percent; the D class, at 8 percent; and the P and M classes, at 4 percent each. The remaining classes…

water fern: …teachers under the trade name C-Fern.

pain: Physiology of pain: Smaller, unmyelinated C fibres respond to chemical, mechanical, and thermal stimuli and are associated with the lingering, poorly localized sensation that follows the first quick sensation of pain.

Nubia: A new population (called C-Group by archaeologists) inhabited Wawat, while a group known in the present day as the Karmah culture occupied Kush. During the First Intermediate Period many Nubians served as mercenaries in Egypt.

Shinya Yamanaka: …a retrovirus that contained the c-Myc gene. This gene was believed to play a fundamental role in reprogramming the nuclei of adult cells. However, Yamanaka recognized that the activation of c-Myc during the process of creating iPS cells led to the formation of tumours when the stem cells were later…

mechanics of solids: Stress: …1822 a basic assumption of continuum mechanics that such surface forces could be represented as a stress vector T, defined so that TdS is an element of force acting over the area dS of the surface (Figure 1). Hence, the principles of linear and angular momentum take the forms

cesarean section, surgical removal of a fetus from the uterus through an abdominal incision. Little is known of either the origin of the term or the history of the procedure. According to ancient sources, whose veracity has been challenged, the procedure takes its name from a branch of the ancient

C-SPAN, nonprofit network that, when launched in 1979, was initially devoted to televising sessions of the U.S. House of Representatives but later expanded, with the creation of additional channels, to air coverage of the U.S. Senate and other government proceedings and public affairs programming.

Pillsbury Company, former American flour miller and food products manufacturer that was acquired by its rival, General Mills, in 2001. Both companies were headquarted in Minneapolis, Minnesota. Through its long history in the baking-goods industry, its cookbooks, and its promotional baking

Central African Republic, landlocked country located in the centre of Africa. The area that is now the Central African Republic has been settled for at least 8,000 years. The earliest inhabitants were the probable ancestors of today’s Aka (Pygmy) peoples, who live in the western and southern

The Most Honourable Order of the Bath, order of British knighthood established by King George I in 1725, conferred as a reward either for military service or for exemplary civilian merit. Like most chivalric orders, it has antecedents that reach far before the actual date of its founding. Bathing

Columbia Pictures Entertainment, Inc., American motion-picture studio that became a major Hollywood studio under its longtime president, Harry Cohn. Columbia originated in 1920 when Cohn, Joe Brandt, and Harry’s brother Jack Cohn founded the C.B.C. Sales Film Corporation to produce shorts and

The Most Excellent Order of the British Empire, British order of knighthood instituted in 1917 by King George V to reward both civilian and military wartime service, although currently the honour is bestowed for meritorious service to the government in peace as well as for gallantry in wartime. In

Helmut Jahn: …2012 it became known as JAHN.

Christian Brother: Congregation of the Brothers of the Christian Schools of Ireland: The Congregation of the Brothers of the Christian Schools of Ireland (C.F.C.) was founded in 1802 in Waterford, Ireland, by Blessed Edmund Ignatius Rice, a merchant of that city. Rice established the order to serve the needs of poor Catholic boys in his country, where the…

Order of the Companions of Honour, British honorary institution founded in 1917 by King George V. The only rank is that of Companion, awarded to men and women who have rendered conspicuous national service, especially in the advancement of culture. Membership of the Order is limited to 65, although

Louis C.K. is an American comedian, writer, director, and producer known for his ribald confessional stand-up comedy and for his television show Louie. Szekely was raised in Mexico City until age seven, when his family moved to Massachusetts. In elementary school he began styling his name “Louis

Vincentian, member of a Roman Catholic society of priests and brothers founded at Paris in 1625 by St. Vincent de Paul for the purpose of preaching missions to the poor country people and training young men in seminaries for the priesthood. To its original work the congregation has added extensive

common metre, a metre used in English ballads that is equivalent to ballad metre, though ballad metre is often less regular and more conversational than common metre. Whereas ballad metre usually has a variable number of unaccented syllables, common metre consists of regular iambic lines with an

The Most Distinguished Order of Saint Michael and Saint George, British order of knighthood founded in 1818 by the Prince Regent, later King George IV, to commemorate the British protectorate over the Ionian islands (now in Greece) and Malta, which came under British rule in 1814. Originally

cash on delivery (C.O.D.), a common business term indicating that goods must be paid for at the time of delivery. The payment is usually due in cash but may be made by check if acceptable to the seller. The transfer agent very often used is the postal service, but it is common for consumer and

Passionist, a religious order of men in the Roman Catholic church, founded by Paolo Francesco Danei (now known as St. Paul of the Cross) in Italy in 1720 to spread devotion to the sufferings and death on the Cross of Jesus Christ. The Passionists fulfill their mission by preaching about Jesus

Don Rickles: …played an embattled advertising executive; C.P.O. Sharkey (1976–78), which was set among the diverse personnel of a naval training centre; and Daddy Dearest (1993), about a combative father-son relationship. Rickles’s other film credits included the madcap war adventure Kelly’s Heroes (1970), Martin Scorsese’s mob drama Casino (1995), and the Toy…

Charles R. Walgreen: …the name was changed to Walgreen Company. By the time of Walgreen’s death, more than 490 stores were operated by the company.

Confederate States of America, in the American Civil War, the government of 11 Southern states that seceded from the Union in 1860–61, carrying on all the affairs of a separate government and conducting a major war until defeated in the spring of 1865. In the decades prior to 1860 there had been

Holy Ghost Father, a Roman Catholic society of men founded in 1703 at Paris by Claude-François Poullart des Places. Originally intended only for the training of seminarians, the congregation gradually took an active part in missionary work. Suppressed by the French Revolution, it was restored under

Redemptorist, a community of Roman Catholic priests and lay brothers founded by St. Alphonsus Liguori at Scala, Italy, a small town near Naples, in 1732. The infant community met an obstacle in the royal court of Naples, which tried to exercise complete control over the order. Only after steps were

Royal Victorian Order, British order of knighthood instituted by Queen Victoria in 1896 to reward personal services rendered the monarch. As it is a family order, conferment of this honour is solely at the discretion of the British sovereign. Unlike other British orders, there is no limit on the

immune system: Activation of the complement system: …complement protein in the pathway, C1, must interact with a bound immunoglobulin. Specifically, C1 interacts with the tail of the Y portion of the bound antibody molecule—i.e., the nonspecific part of the antibody that does not bind antigen. Once bound to the antibody, C1 is cleaved, a process that activates…

Togo: Faure Gnassingbé’s presidency: …to be known as the Coalition of 14 (C14). Primary among the protestors’ demands were the reinstatement of presidential term limits (limiting the president to two terms), for the limits to be retroactive, and the introduction of a two-round presidential election system. Some also called for Gnassingbé to step down.…

naval warfare: The study of trends: Third is command itself—or command and control (C2) in modern parlance—which assimilates the information, decides which actions are called for, and directs forces to act accordingly.

complement: …of the complement system, called C3.

bacteria: Autotrophic metabolism: …the reductive pentose phosphate (Calvin) cycle, the reductive tricarboxylic acid cycle, and the acetyl-CoA pathway. The Calvin cycle, elucidated by American biochemist Melvin Calvin, is the most widely distributed of these pathways, operating in plants, algae, photosynthetic bacteria, and most aerobic lithoautotrophic bacteria. The key step in the Calvin

inflammation: Chemical mediators of inflammation: …in the complement system, namely C3a and C5a. Many cytokines secreted by cells involved in inflammation also have vasoactive and chemotactic properties.

immune system: Activation of the complement system: …of C3, the fragment called C3b.

Amaranthaceae: Physical description: …that they photosynthesize with a special mechanism of carbon fixation; the family represents the largest collection of plants with that photosynthetic pathway.

Amaranthaceae: Physical description: …that they photosynthesize with a special mechanism of carbon fixation; the family represents the largest collection of plants with that photosynthetic pathway.

Amaranthaceae: Physical description: …that they photosynthesize with a special mechanism of carbon fixation; the family represents the largest collection of plants with that photosynthetic pathway.

furfural (C4H3O-CHO), best known member of the furan family and the source of the other technically important furans. It is a colourless liquid (boiling point 161.7 °C; specific gravity 1.1598) subject to darkening on exposure to air. It dissolves in water to the extent of 8.3 percent at 20 °C and

inflammation: Chemical mediators of inflammation: …complement system, namely C3a and C5a. Many cytokines secreted by cells involved in inflammation also have vasoactive and chemotactic properties.

carbon: Properties and uses: Spheroidal, closed-cage fullerenes are called buckerminsterfullerenes, or “buckyballs,” and cylindrical fullerenes are called nanotubes. A fourth form, called Q-carbon, is crystalline and magnetic. Yet another form, called amorphous carbon, has no crystalline structure. Other forms—such as carbon black, charcoal, lampblack, coal, and

glucose, one of a group of carbohydrates known as simple sugars (monosaccharides). Glucose (from Greek glykys; “sweet”) has the molecular formula C6H12O6. It is found in fruits and honey and is the major free sugar circulating in the blood of higher animals. It is the source of energy in cell

DuPont Company: …water in West Virginia of perfluorooctanoic acid (PFOA; also known as C8), which is known to cause developmental problems in laboratory animals. The company also faced litigation and an investigation by the Securities and Exchange Commission (SEC) in connection with that incident. In 2006 DuPont and seven other companies agreed…

cellular automata (CA), model of a spatially distributed process that consists of an array (usually two-dimensional) of cells that “evolve” step-by-step according to the state of neighbouring cells and certain rules that depend on the simulation. CAs can be used to simulate various real-world

accounting: Disclosure and auditing requirements: …in the United States and chartered accountant (CA) in the United Kingdom and many other countries with British-based accounting traditions. Their primary task is to investigate the company’s accounting data and methods carefully enough to permit them to give their opinion that the financial statements present fairly the company’s position,…

calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in Earth’s crust. atomic number20 atomic weight40.078 melting point842 °C (1,548 °F) boiling

cancer: Molecular evaluation: …is produced by ovarian cancers; CA 19-9, which is an indicator of pancreatic or gastrointestinal cancers; and alpha-fetoprotein and chorionic gonadotropin, which can indicate testicular cancer. The diagnostic tests that are necessary to identify genetic alterations and tumour markers and thereby predict the efficacy of a drug are sometimes referred…

Ferdinand Freiligrath: His poems in Ça ira (1846; “This Will Be”) and Neuere politische und soziale Gedichte (1849 and 1851; “Newer Political and Social Poetry”), celebrating the Revolution of 1848, which brought him back to Germany, were even more strongly socialistic and antimonarchical; they are considered to be among the…

Ca Mau Peninsula, peninsula, the southernmost projection of Vietnam, lying between the South China Sea on the east and the Gulf of Thailand on the west, with drainage to each. The flat, triangular peninsula, with lengths ranging from 110 to 130 miles (180 to 210 km), averages about 7 feet (2 m)

Ca River, river rising in the Loi Mountains of Laos and flowing southeastward through northern Vietnam to enter the Gulf of Tonkin near the city of Vinh after a course of 380 miles (612 km). The coastal riverine lowlands have relief features similar to those of the Red River; wide, level stretches

fruit farming: Postharvest physiology of fruits: …further by both refrigeration and controlled atmosphere (CA) storage in which oxygen is kept at about 5 percent and carbon dioxide at 1 to 3 percent, while temperature is held at a level best suited to the particular fruit. So-called CA storage is common today for apples and pears and…

Venice: Palaces: …Gothic palaces, such as the Ca’ d’Oro (1425–c. 1440), the central panel extends across the whole facade and is repeated on two upper stories. In the late 15th century, Renaissance forms began to influence palace architecture, as in the Palazzo Corner, also called Ca’ Grande (c. 1533–c. 1545, designed by…

Alvise Ca’ da Mosto was a Venetian traveler and nobleman, who wrote one of the earliest known accounts of western Africa. Accompanied by Italian explorer Antoniotto Usodimare and financed by Prince Henry the Navigator, Ca’ da Mosto set sail on March 22, 1455. He visited Madeira and the Canary

Venice: Palaces: …the Palazzo Corner, also called Ca’ Grande (c. 1533–c. 1545, designed by Jacopo Sansovino), and the Palazzo Grimani (c. 1556, by Michele Sanmicheli, completed 1575). Buildings such as these introduced a measured proportion, tight symmetry, and Classical vocabulary to the facade. Mannerist and Baroque palaces built in the 17th century

ovarian cancer: Diagnosis and prognosis: …test for a molecule called CA-125 may also be used to detect cancer, but several different cancers and other less-serious disorders can also cause elevated CA-125 levels. Ovarian tumours may be detected by means of imaging procedures such as traditional X rays, computed tomography (CT) scans, magnetic resonance imaging (MRI),…

MRSA: Incidence and types: …known as community associated (CA-MRSA) and health care associated (HA-MRSA), both of which can be transmitted via skin contact. CA-MRSA affects healthy individuals—people who have not been hospitalized for a year or longer—and can cause soft-tissue infections, such as skin boils and abscesses, as well as severe pneumonia, sepsis…

second messenger: , Ca2+), phospholipid-derived molecules (e.g., inositol triphosphate), and even a gas, nitric oxide (NO). The calcium ion Ca2+ has a critical role in the rapid responses of neurons and muscle cells. At rest, cells maintain a low concentration of Ca2+ in the cytoplasm, expending energy to…

Clean Air Act (CAA), U.S. federal law, passed in 1970 and later amended, to prevent air pollution and thereby protect the ozone layer and promote public health. The Clean Air Act (CAA) gave the Environmental Protection Agency (EPA) the power it needed to take effective action to fight environmental

Governor General’s Literary Awards: …established in 1936 by the Canadian Authors Association (CAA), in association with Scottish-born Canadian writer John Buchan, 1st Baron Tweedsmuir, who was the author of Thirty-nine Steps (1915), governor-general of Canada (1935–40), and honorary president of the CAA. The awards, at first called the Dominion Literary Awards, were presented the…

mate: …powder, producing a mate called caa gazu or yerva do polos. In Paraguay and parts of Argentina the leaves, with midribs removed before roasting, are made into a mate called caaminí. In a newer method, similar to the Chinese procedure for drying tea leaves, the leaves are heated in large…