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Claude, Albert
(Encyclopedia) Claude, AlbertClaude, Albertälbârrˈ klōd [key], 1899–1983, Belgian biologist, b. Longlier, M.D., Univ. of Liège, 1928. He joined the Rockefeller Institute (now Rockefeller Univ.) in…Hercules cluster
(Encyclopedia) Hercules cluster, giant globular star cluster in the northern constellation Hercules; cataloged as M13 or NGC 6205. The cluster is just visible to the naked eye and is the best example…half-life
(Encyclopedia) half-life, measure of the average lifetime of a radioactive substance (see radioactivity) or an unstable subatomic particle. One half-life is the time required for one half of any…surface chemistry
(Encyclopedia) surface chemistry, study of chemical reactions in which the reactants are first adsorbed onto a surface medium (see adsorption) that then acts as a catalyst for the reaction; after the…surface tension
(Encyclopedia) surface tension, tendency of liquids to reduce their exposed surface to the smallest possible area. A drop of water, for example, tends to assume the shape of a sphere. The phenomenon…reflection
(Encyclopedia) CE5 Image formation by curved mirrors and lenses reflection, return of a wave from a surface that it strikes into the medium through which it has traveled. The general principles…state of emergency
(Encyclopedia) state of emergency, situation in which a government or a government body is empowered to act with enhanced powers in order to respond to a crisis. The enhanced or emergency powers, and…metabolite
(Encyclopedia) 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…radiochemistry
(Encyclopedia) radiochemistry, chemistry of radioactive substances (see radioactivity). Radioactive isotopes are very useful as tracers to study the mechanisms of complex organic reactions, since…Sainte-Chapelle
(Encyclopedia) Sainte-ChapelleSainte-ChapellesăNt-shäpĕlˈ [key], former chapel in Paris. Forming part of the buildings of the Palais de Justice (once the royal palace) on the Île-de-la-Cité, it was…Trending
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