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embolus
(Encyclopedia) embolusembolusĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis…mass number
(Encyclopedia) mass number, often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom. All atoms of a chemical element have the same atomic…Clausius, Rudolf Julius Emanuel
(Encyclopedia) Clausius, Rudolf Julius EmanuelClausius, Rudolf Julius Emanuelr&oomacr;ˈdôlf y&oomacr;ˈly&oobreve;s āmäˈn&oomacr;ĕl klouˈzē&oobreve;s [key], 1822–88, German…hawkweed
(Encyclopedia) hawkweed, any species of the genus Hieracium of the family Asteraceae (aster family), widely distributed perennials, chiefly of open fields. The small, dandelionlike flower heads are…cephalosporin
(Encyclopedia) cephalosporincephalosporinsĕfˌəlōspôrˈĭn [key], any of a group of more than 20 antibiotics derived from species of fungi of the genus Cephalosporium and closely related chemically to…Green Revolution
(Encyclopedia) Green Revolution, term referring mainly to dramatic increases in cereal-grain yields in many developing countries beginning in the late 1960s, due largely to use of genetically…antisense
(Encyclopedia) antisense, DNA or RNA manipulated in a laboratory so that its components (nucleotides) form a complementary copy of normal, or “sense,” messenger RNA (mRNA; see nucleic acid).…Jacobi, Friedrich Heinrich
(Encyclopedia) Jacobi, Friedrich Heinrich, 1743–1819, German philosopher. Although educated for commerce, he early gave up business and became in 1770 a member of the council for the duchies of Berg…loon
(Encyclopedia) loon, common name for migratory aquatic birds found in fresh- and saltwater in the colder parts of the Northern Hemisphere. Its strange, laughing call carries for great distances. Like…correspondence principle
(Encyclopedia) correspondence principle, physical principle, enunciated by Niels Bohr in 1923, according to which the predictions of the quantum theory must correspond to the predictions of the…Trending
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