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Tallien, Jean Lambert

(Encyclopedia)Tallien, Jean Lambert zhäN läNbĕrˈ tälyăNˈ [key], 1767–1820, French revolutionary. A law clerk and later a printer, he became known through his Jacobin journal, Ami des citoyens. A leader in ...

vision

(Encyclopedia)CE5 Optic nerve vision, physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived. Defects of vision include astigmatism, color blindness, far...

Marggraf, Andreas Sigismund

(Encyclopedia)Marggraf, Andreas Sigismund ändrāˈäs zēˈgĭsmo͝ont märkˈgräfˌ [key], 1709–82, German chemist, a pioneer in analytical chemistry. He proved that alumina, magnesia, and lime are distinct ea...

Kolín

(Encyclopedia)Kolín kôˈlēn [key], city (1991 pop. 31,595), central Czech Republic, in Bohemia, on the Elbe (Labe) River. It is a river port with metal and chemical industries; automobiles are produced nearby. T...

Kopp, Hermann Franz Moritz

(Encyclopedia)Kopp, Hermann Franz Moritz hĕrˈmän fräntz mōˈrĭts kôp [key], 1817–92, German physical chemist and historian of chemistry. His research concerned the connection between the physical propertie...

Helmont, Jan Baptista van

(Encyclopedia)Helmont, Jan Baptista van yän bäptĭsˈtä vän hĕlˈmônt [key], 1577–1644, Flemish physician, chemist, and physicist. He attributed physiological changes to chemical causes, but his conclusions...

Hefei

(Encyclopedia)Hefei or Hofei both: hô-fā [key], city (1994 est. pop. 866,800), capital of Anhui prov., China. A rapidly growing industrial city, it has textile mills, ironworks and steelworks, chemical and food p...

Heyrovsky, Jaroslav

(Encyclopedia)Heyrovsky, Jaroslav, 1890–1967, Czech chemist, Ph.D. Charles Univ. of Prague, 1918; D.Sc. University College, London, 1921. Heyrovsky was director of the Polarography Institute at the Czechoslovak A...

Hodgkin, Sir Alan Lloyd

(Encyclopedia)Hodgkin, Sir Alan Lloyd, 1914–98, English biophysicist. For their work in analyzing the electrical and chemical events in nerve-cell discharge, he and Andrew Huxley shared with Sir John Eccles the 1...

detonator

(Encyclopedia)detonator dĕˈtənāˌtər [key], type of explosive that reacts with great rapidity and is used to set off other, more inert explosives. Fulminate of mercury mixed with potassium chlorate is a common...