- caraway (seasoning)
caraway, (Carum carvi), dry fruit, commonly called seed, of Carum carvi, used as a culinary seasoning. A member of the parsley family (Apiaceae), caraway is native to Europe and western Asia and has been cultivated since ancient times. Caraway has a distinctive aroma reminiscent of anise and a
- Caraway, Hattie (United States senator)
Hattie Caraway was an American Democratic politician who became the first woman elected (1932) to the U.S. Senate. Hattie Wyatt grew up in her native Bakerville, Tennessee, and in nearby Hustburg. She graduated (1896) from Dickson Normal School and for a time thereafter taught school. In 1902 she
- Caraway, Hattie Ophelia (United States senator)
Hattie Caraway was an American Democratic politician who became the first woman elected (1932) to the U.S. Senate. Hattie Wyatt grew up in her native Bakerville, Tennessee, and in nearby Hustburg. She graduated (1896) from Dickson Normal School and for a time thereafter taught school. In 1902 she
- Caraway, Thaddeus H. (United States senator)
Hattie Caraway: In 1902 she married Thaddeus H. Caraway, who subsequently became a congressman and then a U.S. senator for Arkansas.
- Carax, Léos (French director)
Juliette Binoche: …films with the French director Léos Carax, Mauvais sang (1986; Bad Blood) and Les Amants du Pont-Neuf (1991; Lovers on the Pont-Neuf), over the next few years. In 1988 she earned international acclaim as a woman married to a philanderer in The Unbearable Lightness of Being, her first English-language film.…
- Caray, Harry (American sportscaster)
Harry Caray was an American sportscaster who gained national prominence for his telecasts of Chicago Cubs baseball games on Chicago-based superstation WGN during the 1980s and ’90s. After failing to become a professional baseball player out of high school, Caray sold gym equipment before turning
- Carayol, Michel (French physicist)
nuclear weapon: France: Physicist Michel Carayol laid out what would be the fundamental idea of radiation implosion in an April 1967 paper, but neither he nor his colleagues were immediately convinced that it was the solution, and the search continued.
- Carazo Odio, Rodrigo (president of Costa Rica)
Rodrigo Carazo Odio was the president of Costa Rica (1978–82). A graduate in economics from the University of Costa Rica, Carazo entered politics as a member of the National Liberation Party (Partido de Liberación Nacional; PLN) and as a follower of then president, José Figueres Ferrer. He later
- carbaborane (chemical compound)
carborane, any member of a class of organometallic compounds containing carbon (C), boron (B), and hydrogen (H). The general formula of carboranes is represented by C2BnHn + 2, in which n is an integer; carboranes with n ranging from 3 to 10 have been characterized. The first carboranes were
- Carballo (town, Spain)
Carballo, town, A Coruña provincia (province), in the comunidad autónoma (autonomous community) of Galicia, northwestern Spain. It is located near the Atlantic coast, about 25 miles (40 km) southwest of A Coruña city. A market centre for cereals and dairy products, Carballo is known for the hot
- carbamate (chemical compound)
insecticide: Carbamates: The carbamates are a group of insecticides that includes such compounds as carbamyl, methomyl, and carbofuran. They are rapidly detoxified and eliminated from animal tissues. Their toxicity is thought to arise from a mechanism somewhat similar to that for the organophosphates.
- carbamazepine (drug)
mental disorder: Mood-stabilizing drugs: Carbamazepine, an anticonvulsant drug, has been shown to be effective in the treatment of mania and in the maintenance treatment of bipolar disorder. It may be combined with lithium in patients with bipolar disorder who fail to respond to either drug alone. Divalproex, another anticonvulsant,…
- carbamide (chemical compound)
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
- carbamoyl phosphate (chemical compound)
metabolism: Disposal of nitrogen: …dioxide and ATP to form carbamoyl phosphate, ADP, and inorganic phosphate, as shown in reaction [30].
- carbamoyl phosphate synthetase (enzyme)
metabolism: Disposal of nitrogen: The reaction is catalyzed by carbamoyl phosphate synthetase. The carbamoyl moiety of carbamoyl phosphate (NH2CO―) is transferred to ornithine, an amino acid, in a reaction catalyzed by ornithine transcarbamoylase; the products are citrulline and inorganic phosphate [31]. Citrulline and aspartate formed from amino acids via step [26b] react to form…
- carbamoylaspartate (chemical compound)
metabolism: Pyrimidine ribonucleotides: …[30]) condense to form N-carbamoylaspartate (reaction [70]), which loses water in a reaction ([71]) catalyzed by dihydroorotase.
- carbanion (chemistry)
carbanion, any member of a class of organic compounds in which a negative electrical charge is located predominantly on a carbon atom. Carbanions are formally derived from neutral organic molecules by removal of positively charged atoms or groups of atoms, and they are important chiefly as chemical
- carbanion reactivity
organometallic compound: Carbanion character: …is frequently referred to as nucleophilic or carbanion character. Thus, organometallic compounds containing highly active (electropositive) metals, such as lithium, magnesium, aluminum, and zinc, react rapidly and completely with water, liberating a hydrocarbon in the process. For example, dimethylzinc liberates methane gas along with solid zinc hydroxide. Zn(CH3)2 + 2H2O…
- carbapenem-resistant Enterobacteriaceae (bacterium)
Enterobacter: …to drug resistance, including against carbapenems, which were once highly effective against multidrug-resistant organisms. Newer approaches to Enterobacter infections have adopted combination-therapy regimens employing multiple antibiotics with different core structures, such as an aminoglycoside or a fluoroquinolone in combination with a beta-lactam agent. Despite the promise of this more diverse…
- carbaryl (chemical compound)
agricultural technology: Chemical control of insects: Malathion and carbaryl, for example, are used to control insects in areas where persistent materials might appear later in meat or milk and can also be applied in areas where fish and wildlife might be affected. Those two chemicals offer a broad range of toxicity to insect…
- carbene (chemistry)
carbene, any member of a class of highly reactive molecules containing divalent carbon atoms—that is, carbon atoms that utilize only two of the four bonds they are capable of forming with other atoms. Occurring usually as transient intermediates during chemical reactions, they are important chiefly
- Carbet Mountains (mountains, Martinique)
Carbet Mountains, volcanic mountain mass on the Caribbean island of Martinique, in the Lesser Antilles. The peaks are about 3.5 miles (6 km) from the west coast, standing between Saint-Pierre and Fort-de-France. They rise to 3,924 feet (1,196 metres) at Lacroix, 3,806 feet (1,160 metres) at Piquet,
- Carbet Peaks (mountains, Martinique)
Carbet Mountains, volcanic mountain mass on the Caribbean island of Martinique, in the Lesser Antilles. The peaks are about 3.5 miles (6 km) from the west coast, standing between Saint-Pierre and Fort-de-France. They rise to 3,924 feet (1,196 metres) at Lacroix, 3,806 feet (1,160 metres) at Piquet,
- carbide (chemical compound)
carbide, any of a class of chemical compounds in which carbon is combined with a metallic or semimetallic element. Calcium carbide is important chiefly as a source of acetylene and other chemicals, whereas the carbides of silicon, tungsten, and several other elements are valued for their physical
- carbide lamp
mining: History: …flint sparker made these so-called carbide lamps easy to light. In the 1930s battery-powered cap lamps began entering mines, and since then various improvements have been made in light intensity, battery life, and weight.
- carbidopa (drug)
dementia with Lewy bodies: Diagnosis, treatment, and prognosis: …that may be used include carbidopa and levodopa (commonly marketed as Sinemet), a dopamine precursor drug combination that addresses symptoms of parkinsonism, and cholinesterase inhibitors, which augment levels of acetylcholine. Other therapeutic approaches include physical therapy, speech therapy, and occupational therapy. Mental health counseling, support groups, and
- carbimazole (drug)
hyperthyroidism: Treatment of hyperthyroidism: …three widely used antithyroid drugs—methimazole, carbimazole (which is rapidly converted to methimazole in the body), and propylthiouracil. These drugs block the production of thyroid hormone but have no permanent effect on either the thyroid gland or the underlying cause of the hyperthyroidism. Patients with hyperthyroidism caused by Graves disease are…
- carbine (weapon)
carbine, light, short-barrelled musket or rifle. The word, the source of which is obscure, seems to have originated in the late or mid-16th century. The carbine, in various versions corresponding to the different full-sized military arms, was chiefly a cavalry weapon until the 18th century. Then
- Carbine, Patricia (American journalist)
Ms: …by American feminists Gloria Steinem, Patricia Carbine, and others, that was the first nationally circulated women’s magazine to bring feminism and the issues of the women’s rights movement into the mainstream. From the beginning, the editors of the magazine assumed that their readers were interested in more than new recipes…
- carbinol (chemical compound)
methanol (CH3OH), the simplest of a long series of organic compounds called alcohols, consisting of a methyl group (CH3) linked with a hydroxy group (OH). Methanol was formerly produced by the destructive distillation of wood. The modern method of preparing methanol is based on the direct
- Carbo, Gaius Papirius (Roman politician)
Gaius Papirius Carbo was a Roman politician who supported the agrarian reforms of Tiberius Sempronius Gracchus but later deserted the Gracchan party. As tribune in 131, Carbo carried a measure that extended voting by ballot to the enactment and repeal of laws. A year later he became a member of the
- Carbo, Gnaeus Papirius (Roman general)
Gnaeus Papirius Carbo was a Roman general, leader of the forces of Gaius Marius in the civil war between Marius and Lucius Cornelius Sulla. In 87 he took part in Marius’ blockade of Rome, which was at that time held by pro-Sullan forces. Rome capitulated, and Carbo and Lucius Cornelius Cinna, both
- carbocation (chemistry)
organohalogen compound: Nucleophilic substitution: …carbon and is called a carbocation. Carbocations are unstable and react rapidly with substances such as nucleophiles that have unshared electrons available for bond formation.
- carbocyclic compound (chemical compound)
heterocyclic compound: Comparison with carbocyclic compounds: The molecules of organic chemical compounds are built up from a framework or backbone of carbon atoms to which are attached hydrogen (H), oxygen, or other heteroatoms. Carbon atoms have the unique property of being able to link with one another to form…
- carbohydrate (biochemistry)
carbohydrate, class of naturally occurring compounds and derivatives formed from them. Carbohydrates are probably the most abundant and widespread organic substances in nature and are essential constituents of all living things. The term carbohydrate means “watered carbon”; the general formula
- carbohydrate-deficient glycoprotein syndrome (pathology)
metabolic disease: Congenital disorders of glycosylation: Congenital disorders of glycosylation (CDG; formerly known as carbohydrate-deficient glycoprotein syndrome) are recently described diseases that affect the brain and many other organs. The primary biochemical defects of CDG are in the N-glycosylation pathway that occurs in the cytoplasm and endoplasmic…
- carbolic acid (chemistry)
carbolic acid, simplest member of the phenol family of organic compounds. See
- Carbolon (chemical compound)
silicon carbide, exceedingly hard, synthetically produced crystalline compound of silicon and carbon. Its chemical formula is SiC. Since the late 19th century silicon carbide has been an important material for sandpapers, grinding wheels, and cutting tools. More recently, it has found application
- Carbon (county, Pennsylvania, United States)
Carbon, county, eastern Pennsylvania, U.S., flanked to the north by the Pocono Mountains and to the south by Blue Mountain and located midway between the cities of Wilkes-Barre and Allentown. It consists of a mountainous region lying largely in the Appalachian Ridge and Valley physiographic
- carbon (chemical element)
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
- carbon adsorption (chemistry)
water supply system: Carbon adsorption: An effective method for removing dissolved organic substances that cause tastes, odours, or colours is adsorption by activated carbon. Adsorption is the capacity of a solid particle to attract molecules to its surface. Powdered carbon mixed with water can adsorb and hold many…
- carbon assimilation (biochemistry)
photosynthesis: The process of photosynthesis: carbon fixation and reduction: The assimilation of carbon into organic compounds is the result of a complex series of enzymatically regulated chemical reactions—the dark reactions. This term is something of a misnomer, for these reactions can take place in either light or darkness. Furthermore, some…
- carbon bisulfide (chemical compound)
carbon disulfide (CS2), a colourless, toxic, highly volatile and flammable liquid chemical compound, large amounts of which are used in the manufacture of viscose rayon, cellophane, and carbon tetrachloride; smaller quantities are employed in solvent extraction processes or converted into other
- carbon black (chemistry)
carbon black, any of a group of intensely black, finely divided forms of amorphous carbon, usually obtained as soot from partial combustion of hydrocarbons, used principally as reinforcing agents in automobile tires and other rubber products but also as extremely black pigments of high hiding power
- carbon budget (ecology)
carbon cycle, in biology, circulation of carbon in various forms through nature. Carbon is a constituent of all organic compounds, many of which are essential to life on Earth. The source of the carbon found in living matter is carbon dioxide (CO2) in the air or dissolved in water. Algae and
- carbon burial (technology)
carbon capture and storage (CCS), the process of recovering carbon dioxide from the fossil-fuel emissions produced by industrial facilities and power plants and moving it to locations where it can be kept from entering the atmosphere in order to mitigate global warming. Carbon capture and storage
- carbon capture and storage (technology)
carbon capture and storage (CCS), the process of recovering carbon dioxide from the fossil-fuel emissions produced by industrial facilities and power plants and moving it to locations where it can be kept from entering the atmosphere in order to mitigate global warming. Carbon capture and storage
- carbon cycle (ecology)
carbon cycle, in biology, circulation of carbon in various forms through nature. Carbon is a constituent of all organic compounds, many of which are essential to life on Earth. The source of the carbon found in living matter is carbon dioxide (CO2) in the air or dissolved in water. Algae and
- carbon cycle (nuclear fusion)
CNO cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars. It is only a minor source of energy for the Sun and does not operate at all in very cool stars. Four hydrogen nuclei are in effect converted into one helium nucleus, a fraction of the mass
- carbon dioxide (chemical compound)
carbon dioxide, (CO2), a colourless gas having a faint sharp odour and a sour taste. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere (about 3 volumes in 10,000), formed in combustion of carbon-containing materials, in
- carbon dioxide emission (pollution)
cement: Manufacture of cement: …the world’s carbon dioxide (CO2) emissions come from the manufacture of cement, making it a major contributor to global warming. Some of the solutions to these greenhouse gas emissions are common to other sectors, such as increasing the energy efficiency of cement plants, replacing fossil fuels with renewable energy, and…
- carbon dioxide fixation (biochemistry)
photosynthesis: The process of photosynthesis: carbon fixation and reduction: The assimilation of carbon into organic compounds is the result of a complex series of enzymatically regulated chemical reactions—the dark reactions. This term is something of a misnomer, for these reactions can take place in either light or darkness. Furthermore, some…
- carbon dioxide laser (instrument)
laser: Types of lasers: …commercial gas laser is the carbon-dioxide laser, which can generate kilowatts of continuous power.
- carbon dioxide stunning
meat processing: Stunning: are mechanical, electrical, and carbon dioxide (CO2) gas. The end result of each method is to render the animal unconscious. Mechanical stunning involves firing a bolt through the skull of the animal using a pneumatic device or pistol. Electrical stunning passes a current of electricity through the brain of…
- carbon disulfide (chemical compound)
carbon disulfide (CS2), a colourless, toxic, highly volatile and flammable liquid chemical compound, large amounts of which are used in the manufacture of viscose rayon, cellophane, and carbon tetrachloride; smaller quantities are employed in solvent extraction processes or converted into other
- carbon emission (pollution)
cement: Manufacture of cement: …the world’s carbon dioxide (CO2) emissions come from the manufacture of cement, making it a major contributor to global warming. Some of the solutions to these greenhouse gas emissions are common to other sectors, such as increasing the energy efficiency of cement plants, replacing fossil fuels with renewable energy, and…
- carbon fibre (technology)
materials science: Plastics and composites: For example, carbon fibres have extremely high modulus values (up to five times that of steel) and therefore make excellent reinforcements. However, their cost precludes their extensive use in automobiles, trucks, and trains, although they are used regularly in the aerospace industry. More suitable for non-aerospace applications…
- carbon fixation (biochemistry)
photosynthesis: The process of photosynthesis: carbon fixation and reduction: The assimilation of carbon into organic compounds is the result of a complex series of enzymatically regulated chemical reactions—the dark reactions. This term is something of a misnomer, for these reactions can take place in either light or darkness. Furthermore, some…
- carbon footprint (ecology and conservation)
carbon footprint, amount of carbon dioxide (CO2) emissions associated with all the activities of a person or other entity (e.g., building, corporation, country, etc.). It includes direct emissions, such as those that result from fossil-fuel combustion in manufacturing, heating, and transportation,
- carbon group element (chemical elements)
carbon group element, any of the six chemical elements that make up Group 14 (IVa) of the periodic table—namely, carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl). Except for germanium and the artificially produced flerovium, all of these elements are familiar in
- carbon microphone (electroacoustic device)
microphone: … of a carbon contact (carbon microphone), in electrostatic capacitance (condenser microphone), in the motion of a coil (dynamic microphone) or conductor (ribbon microphone) in a magnetic field, or in the twisting or bending of a piezoelectric crystal (crystal microphone). In each case, motion of the diaphragm produces a variation…
- carbon monofluoride (chemical compound)
battery: Lithium batteries: The lithium–carbon monofluoride system has been among the more successful early commercial lithium miniature batteries. It has been used extensively in cameras and smaller devices, providing about 3.2 volts per cell, high power density, and long shelf life. Good low-temperature performance and constant voltage discharge over…
- carbon monoxide (chemical compound)
carbon monoxide, (CO), a highly toxic, colorless, odorless, flammable gas produced industrially for use in the manufacture of numerous organic and inorganic chemical products. Carbon monoxide is also present in the exhaust gases of internal-combustion engines and furnaces as a result of incomplete
- carbon monoxide insertion (chemistry)
organometallic compound: Simple alkyl ligands: …reaction frequently referred to as CO insertion leads to carbon-carbon bond formation between the carbon atom of a carbonyl ligand and the carbon atom of an alkyl ligand, which is the methyl group in the following example.
- carbon monoxide poisoning (medicine)
carbon monoxide poisoning, often fatal condition resulting from inhalation of carbon monoxide, frequently occurring in association with inhalation of smoke or automobile exhaust. Hemoglobin, the oxygen-carrying substance in blood, has a much greater affinity for carbon monoxide than it has for
- carbon nanotube (chemical compound)
carbon nanotube, nanoscale hollow tubes composed of carbon atoms. The cylindrical carbon molecules feature high aspect ratios (length-to-diameter values) typically above 103, with diameters from about 1 nanometer up to tens of nanometers and lengths up to millimeters. This unique one-dimensional
- carbon nucleophile (chemistry)
aldehyde: Addition of carbon nucleophiles: A wide variety of carbon nucleophiles add to aldehydes, and such reactions are of prime importance in synthetic organic chemistry because the product is a combination of two carbon skeletons. Organic chemists have been able to assemble almost any carbon skeleton, no matter…
- carbon offset
carbon offset, any activity that compensates for the emission of carbon dioxide (CO2) or other greenhouse gases (measured in carbon dioxide equivalents [CO2e]) by providing for an emission reduction elsewhere. Because greenhouse gases are widespread in Earth’s atmosphere, the climate benefits from
- carbon oxide
oxide: Oxides of carbon: → 4H3PO4 Carbon forms two well-known oxides, carbon monoxide, CO, and carbon dioxide, CO2. In addition, it also forms carbon suboxide, C3O2.
- carbon paper
carbon paper, a tissue of varying weight coated with a colour, generally carbon black, and some waxy medium. It is usually coated on one side but may be coated on both sides for special purposes. For duplication of typewritten or hand-printed documents, it is coated on one side only. The paper upon
- carbon sequestration
carbon sequestration, the long-term storage of carbon in plants, soils, geologic formations, and the ocean. Carbon sequestration occurs both naturally and as a result of anthropogenic activities and typically refers to the storage of carbon that has the immediate potential to become carbon dioxide
- carbon sink (biochemistry)
carbon sequestration: Carbon sources and carbon sinks: …Earth’s atmosphere are known as carbon sinks. For example, deforestation is a source of carbon emission into the atmosphere, but forest regrowth is a form of carbon sequestration, with the forests themselves serving as carbon sinks. Carbon is transferred naturally from the atmosphere to terrestrial carbon sinks through photosynthesis; it…
- carbon skeleton (chemistry)
aldehyde: Addition of carbon nucleophiles: …is a combination of two carbon skeletons. Organic chemists have been able to assemble almost any carbon skeleton, no matter how complicated, by ingenious uses of these reactions. One of the oldest and most important is the addition of Grignard reagents (RMgX, where X is a halogen atom). French chemist…
- carbon steel (metallurgy)
carbon steel, metal manufactured from the elements iron and carbon, with the carbon imparting hardness and strength and determining the degree to which such physical properties exist. See
- carbon suboxide (chemical compound)
oxide: Carbon suboxide: Carbon suboxide, C3O2, is a foul-smelling lacrimatory (tear-stimulating) gas produced by the dehydration of malonic acid, CH2(COOH)2, with P4O10 in a vacuum at 140 to 150 °C (284 to 302 °F). Carbon suboxide is a linear symmetrical molecule whose structure can be represented…
- carbon tax
carbon tax, tax levied on firms that produce carbon dioxide (CO2) through their operations. It is used as an incentive to reduce the economy-wide usage of high-carbon fuels and to protect the environment from the harmful effects of excessive carbon dioxide emissions. A carbon tax is levied on CO2
- carbon tetrachloride (chemical compound)
carbon tetrachloride, a colourless, dense, highly toxic, volatile, nonflammable liquid possessing a characteristic odour and belonging to the family of organic halogen compounds, used principally in the manufacture of dichlorodifluoromethane (a refrigerant and propellant). First prepared in 1839 by
- carbon tissue (printing)
photoengraving: Gravure and rotogravure: …exposed a positive transparency over carbon tissue, a film that was made of coloured gelatin sensitized with potassium dichromate and backed by a sheet of paper. The exposed film was pressed down on a copper plate that was coated with an even layer of resin or asphalt powder. The carbon…
- carbon trading (pollution control)
emissions trading, an environmental policy that seeks to reduce air pollution efficiently by putting a limit on emissions, giving polluters a certain number of allowances consistent with those limits, and then permitting the polluters to buy and sell the allowances. The trading of a finite number
- carbon transmitter (electronics)
telephone: Transmitter: In traditional carbon transmitters, developed in the 1880s, a thin layer of carbon granules separates a fixed electrode from a diaphragm-activated electrode. Electric current flows through the carbon against a certain resistance. The diaphragm, vibrating in response to the speaker’s voice, forces the movable electrode to exert…
- carbon-12 (isotope)
atomic mass unit: …of a single atom of carbon-12, the most abundant isotope of carbon, or 1.660538921 × 10 −24 gram. The mass of an atom consists of the mass of the nucleus plus that of the electrons, so the atomic mass unit is not exactly the same as the mass of the…
- carbon-13 (isotope)
carbon: Nuclear properties: …percent of natural carbon) and carbon-13 (1.07 percent); 14 radioactive isotopes are known, of which the longest-lived is carbon-14, which has a half-life of 5,730 ± 40 years.
- carbon-13 nuclear magnetic resonance spectroscopy
chemical compound: Carbon-13 magnetic resonance spectroscopy: Naturally occurring carbon is composed almost entirely of the carbon-12 isotope, which has no magnetic moment and thus is not detectable by NMR techniques. However, carbon-13 (13C) atoms, which make up about 1 percent of all carbon atoms, do absorb radio-frequency…
- carbon-14 (isotope)
carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. The carbon-14 nucleus has six protons and eight neutrons, for an atomic mass of 14. The isotope also is used as a tracer in following the course of particular carbon atoms
- carbon-14 dating (scientific technology)
carbon-14 dating, method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14). Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays
- carbon-arc lamp (lighting)
incandescent lamp: Electric incandescent lamps: The carbon-arc electric light was demonstrated as early as 1808, and in 1858 English physicist and chemist Michael Faraday devised the first steam-powered electric generator to operate a large carbon-arc lamp for the South Foreland Lighthouse, but the carbon-arc lamp was so bright and required so…
- carbon-button transmitter (electronics)
telephone: Transmitter: In traditional carbon transmitters, developed in the 1880s, a thin layer of carbon granules separates a fixed electrode from a diaphragm-activated electrode. Electric current flows through the carbon against a certain resistance. The diaphragm, vibrating in response to the speaker’s voice, forces the movable electrode to exert…
- carbon-carbon composite material
materials science: Other advanced composites: Carbon-carbon composites are closely related to CMCs but differ in the methods by which they are produced. Carbon-carbon composites consist of semicrystalline carbon fibres embedded in a matrix of amorphous carbon. The composite begins as a PMC, with semicrystalline carbon fibres impregnated with a polymeric…
- carbon-carbon double chain (chemistry)
ethylene-propylene copolymer: …EPDM is that the residual carbon-carbon double bond (the double bond that remains in the diene molecule after polymerization) is attached to the polymer chain rather than being made part of it. Carbon-carbon double bonds are quite reactive. For example, ozone in the atmosphere adds quickly to a double bond…
- carbon-chain polymer (chemistry)
plastic: The composition, structure, and properties of plastics: …polymers having only aliphatic (linear) carbon atoms in their backbone chains. All the commodity plastics listed above fall into this category. The structure of polypropylene can serve as an example; here attached to every other carbon atom is a pendant methyl group (CH3):
- carbon-filament bulb
incandescent lamp: Electric incandescent lamps: The carbon-filament bulb was actually highly inefficient, but it banished the soot and fire hazards of coal-gas jets and thus soon gained wide acceptance. Indeed, thanks to the incandescent lamp, electric lighting became an accepted part of urban life by 1900. The carbon-filament bulb was eventually…
- carbon-metal bond (chemistry)
organometallic compound: containing at least one metal-to-carbon bond in which the carbon is part of an organic group. Organometallic compounds constitute a very large group of substances that have played a major role in the development of the science of chemistry. They are used to a large extent as catalysts (substances that…
- carbon–nitrogen cycle (nuclear fusion)
CNO cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars. It is only a minor source of energy for the Sun and does not operate at all in very cool stars. Four hydrogen nuclei are in effect converted into one helium nucleus, a fraction of the mass
- carbon–nitrogen–oxygen cycle (nuclear fusion)
CNO cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars. It is only a minor source of energy for the Sun and does not operate at all in very cool stars. Four hydrogen nuclei are in effect converted into one helium nucleus, a fraction of the mass
- carbon-reduction process
molybdenum processing: Ferromolybdenum: …a metallothermic process or a carbon-reduction process in electric furnaces. Because the latter process has the inherent disadvantage of introducing a high carbon content into the FeMo alloy, the thermic process, in which aluminum and silicon metals are used for the reduction of a charge consisting of a mixture of…
- carbonaceous chondrite (meteorite)
carbonaceous chondrite, a diverse class of chondrites (one of the two divisions of stony meteorites), important because of the insights they provide into the early history of the solar system. They comprise about 3 percent of all meteorites collected after being seen to fall to Earth. Carbonaceous
- carbonado (mineral)
carbonado, one of the varieties of industrial diamond
- carbonara (dish)
carbonara, a pasta dish, typically made with spaghetti, that blends diced pork, eggs, cheese, and black pepper. When U.S. military personnel arrived in Italy in 1943 to battle the forces of Fascist Italy and Nazi Germany, they brought with them abundant stocks of powdered eggs and dehydrated bacon,
- Carbonari (Italian secret society members)
Carbonari, in early 19th-century Italy, members of a secret society (the Carboneria) advocating liberal and patriotic ideas. The group provided the main source of opposition to the conservative regimes imposed on Italy by the victorious allies after the defeat of Napoleon in 1815. Their influence
- Carbonária (Portuguese secret society)
Portugal: The rise of republicanism: …hidden organization such as the Carbonária, a republican secret society, the killings were applauded by the republicans, who immediately began their preparations for a final attack on the monarchy.