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interest
interest charge for the use of credit or money, usually figured as a percentage of the principal and computed annually. Simple interest is computed annually on the principal. Compound interest, paid by some savings banks, computes the interest on the principal as well as on any previous interest th...
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thyroxine
thyroxine , substance secreted by the thyroid gland . The hormone thyroxine forms by combining the amino acid tyrosine with iodine. Complexed to a protein, it is stored in the follicle stems between thyroid cells. Thyroxine enters into the bloodstream complexed to another protein, plasma globulin...
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Interstate Commerce Commission
Interstate Commerce Commission (ICC), former independent agency of the U.S. government, established in 1887; it was charged with regulating the economics and services of specified carriers engaged in transportation between states. Surface transportation under the ICC's jurisdiction included railroa...
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sympathetic nervous system
sympathetic nervous system That part of the autonomic nervous system which generally acts to stimulate the body to cope with stress, such as increasing the rate of heart beat. Nerves of the sympathetic nervous system tend to form ganglia (ganglion) beside the vertebrae, preganglionic fibres leading ...
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foreign exchange
foreign exchange methods and instruments used to adjust the payment of debts between two nations that employ different currency systems. A nation's balance of payments has an important effect on the exchange rate of its currency. Bills of exchange, drafts, checks, and telegraphic orders are the p...
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parasympathetic nervous system
parasympathetic nervous system That part of the autonomic nervous system which generally causes bodily functions to become appropriate for calm conditions, for instance by slowing down the heart rate and promoting digestion. Nerves of the parasympathetic nervous system tend to form ganglia (ganglion...
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Postal Service, U.S.
Postal Service, U.S. For most of its history, the postal service was the nation's largest civilian institution and the federal government's most visible manifestation in Americans’ everyday lives. Empowered by the Constitution to “establish Post Offices and post Roads,” Congress...
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population
population the inhabitants of a given area, but perhaps most importantly, the human inhabitants of the earth (numbering about 6.2 billion in 2002), who by their increasing numbers and corresponding increasing needs can seriously affect the global ecosystem.
Population Growth
History and ...
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profit sharing
profit sharing arrangement by which employees receive, in addition to their wages, a share of the net profits of a business. The purpose is to give them an incentive to increase their output through enhanced morale, less wasteful use of materials, better care of equipment, and the like. Profit shar...
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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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