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chain reaction
(Encyclopedia) CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause…punctuation
(Encyclopedia) punctuation [Lat.,=point], the use of special signs in writing to clarify how words are used; the term also refers to the signs themselves. In every language, besides the sounds of the…fossil
(Encyclopedia) fossil, remains or imprints of plants or animals preserved from prehistoric times by the operation of natural conditions. Fossils are found in sedimentary rock, asphalt deposits, and…mechanism
(Encyclopedia) mechanism, philosophical theory about the nature of organic systems, holding that organisms are machines in the sense that they are material systems. Mechanism seeks to explain…D'Israeli, Isaac
(Encyclopedia) D'Israeli, Isaac, 1766–1848, English critic and historian, b. London; father of Benjamin Disraeli. Born into a wealthy Jewish family, he produced his first poem at the age of 14. His…cyst
(Encyclopedia) cyst, abnormal sac in the body, filled with a fluid or semisolid and enclosed in a membrane. Cysts can be congenital but are usually acquired, the most common locations being the skin…Roth v. United States
(Encyclopedia) Roth v. United States, case decided in 1957 by the U.S. Supreme Court. Samuel Roth of New York City was convicted of mailing obscene materials. On appeal his conviction was affirmed by…Barante, Amable Guillaume Prosper Brugière, baron de
(Encyclopedia) Barante, Amable Guillaume Prosper Brugière, baron deBarante, Amable Guillaume Prosper Brugière, baron deämäˈblə gēyōmˈ prôspĕrˈ brüzhyĕrˈ bärôNˈ də bäräNtˈ [key], 1782–1866, French…actinomycin
(Encyclopedia) actinomycinactinomycinăkˌtənōmīˈsən [key], any one of a group of antibiotics produced by bacteria of the genus Streptomyces. Actinomycin was the first antibiotic reported to be able to…paperboard
(Encyclopedia) paperboard, material similiar in shape and composition to paper, but generally thicker, stronger, and more rigid. Paper machines, e.g., Fourdrinier machines, are used to make sheets of…Trending
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