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activation energy
activation energy in chemistry, minimum energy needed to cause a chemical reaction . A chemical reaction between two substances occurs only when an atom, ion, or molecule of one collides with an atom, ion, or molecule of the other. Only a fraction of the total collisions result in a reaction, be...
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New Orleans
New Orleans , city (2006 pop. 187,525), coextensive with Orleans parish, SE La., between the Mississippi River and Lake Pontchartrain, 107 mi (172 km) by water from the river mouth; founded 1718 by the sieur de Bienville , inc. 1805. It was built within a great bend of the Mississippi (and is there...
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Organization of Petroleum Exporting Countries
Organization of Petroleum Exporting Countries (OPEC), multinational organization (est. 1960, formally constituted 1961) that coordinates petroleum policies and economic aid among oil-producing nations. Its Board of Governors and board chairperson are elected by member nations; OPEC's headquarters a...
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Sir Nigel Playfair
Sir Nigel Playfair , 1874-1934, English actor-manager. He made his acting debut in 1902 and later appeared in major London productions of Shaw and Shakespeare. He took on the management of the Lyric Theatre from 1919 to 1932. There Playfair's greatest achievements were his revival (1920) of John Gay...
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fermentation
fermentation process by which the living cell is able to obtain energy through the breakdown of glucose and other simple sugar molecules without requiring oxygen. Fermentation is achieved by somewhat different chemical sequences in different species of organisms. Two closely related paths of ferm...
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Paul Newman
Paul Newman 1925-2008, American actor, b. Cleveland, Ohio. After performing in a Broadway play (1952-53) and in television dramas, Newman became a versatile film actor and a major Hollywood star. He made his movie debut in 1954 and achieved leading man status with his role in Somebody Up There Lik...
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Weston-super-Mare
Weston-super-Mare , city (1991 pop. 60,821), North Somerset, SW England, on the Bristol Channel. It is a seaside resort with attractions that include Worlebury Hill, with its Iron Age hill fort and beautiful view of the opposite coast of Wales; a long esplanade; and Brean Down, a bird sanctuary. The...
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tritium
tritium , radioactive isotope of hydrogen with mass number 3. The tritium nucleus, called a triton, contains one proton and two neutrons. It has a half-life of 12.5 years and decays by beta-particle emission. The symbol is T or 3 H. It is one form of heavy hydrogen, the other being deuterium. It ...
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adenosine monophosphate
adenosine monophosphate (AMP) , organic compound composed of an adenine base, the sugar ribose , and one phosphate unit. AMP is one of the possible products of the hydrolysis of adenosine triphosphate (ATP) and is therefore important in the transfer of chemical energy during anabolism. Cyclic...
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metabolite
metabolite organic compound that is a starting material in, an intermediate in, or an end product of metabolism . Starting materials are substances, usually small and of simple structure, absorbed by the organism as food. These include the vitamins and essential amino acids. They can be used to co...
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