21. Urey, Harold Clayton urey, harold clayton (18931981). US chemist. In 1932 he isolatedheavy water and discovered deuterium, for which he was awarded http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/U/Urey/1.html

Urey, Harold Clayton US chemist. In 1932 he isolated heavy water and discovered deuterium, for which he was awarded the 1934 Nobel Prize for Chemistry. During World War II he was a member of the Manhattan Project, which produced the atomic bomb, and after the war he worked on tritium (another isotope of hydrogen, of mass 3) for use in the hydrogen bomb, but later he advocated nuclear disarmament and world government. Urey was born in Indiana and educated at Montana State University. He became professor of chemistry at Columbia 1934, and was at Chicago 1945-58. After deuterium, Urey went on to isolate heavy isotopes of carbon, nitrogen, oxygen, and sulphur. His group provided the basic information for the separation of the fissionable isotope uranium-235 from the much more common uranium-238. Urey also developed theories about the formation of the Earth. He thought that the Earth had not been molten at the time when its materials accumulated. In 1952, he suggested that molecules found in its primitive atmosphere could have united spontaneously to give rise to life. The Moon, he believed, had a separate origin from the Earth.

22. Harold Clayton Urey, April 29, 1893—January 5, 1981 | By James R. Arnold, Jacob harold clayton urey. April 29, 1893 January 5, 1981. By James R. Arnold, Jacob Bigeleisen, and Clyde A. Hutchison Jr. harold clayton urey was born in Walkerton, a small town in Indiana, on April http://www.nap.edu/html/biomems/hurey.html

BIOGRAPHICAL MEMOIRS National Academy of Sciences Harold Clayton Urey By James R. Arnold, Jacob Bigeleisen, and Clyde A. Hutchison Jr. HAROLD UREY WAS A scientist whose interests, accomplishments, and influence spanned the disciplines of chemistry, astronomy, astrophysics, geology, geophysics, and biology. Although he was meticulous in his attention to detail, his sights were always on broad questions at the forefront of knowledge. His unusual powers of concentration and capacity for hard work accounted for much of his success in exploring and opening up major new fields of research, including his discovery of deuterium and work on isotope chemistry, isotope separation, isotope geology, and cosmochemistry. Urey's approach to a new area began with his becoming thoroughly familiar with what was known about the subject of his curiosity and then the formulation of a theory to explain a large amount of uncorrelated material, which was then followed by carefully planned experiments. The latter frequently involved the design of new experimental equipment beyond the state of the art. As a graduate student in physical chemistry in the early 1920s, Urey realized that future progress in that discipline would require a knowledge of the quantum theory of atomic and molecular systems, which was undergoing a revolution in Europe. He supplemented his command of mathematics and physics by formal coursework prior to going to the Bohr Institute in Copenhagen in 1923. His exposure there led to his formulation of the concept of the electron spin concurrent with but less complete than the Goudsmit-Uhlenbeck discovery. After completion of his text with Arthur Ruark

23. Urey, Harold Clayton http://www.cartage.org.lb/fr/themes/Biographies/mainbiographie/U/Urey/Urey.htm

Urey, Harold Clayton Né le 29 avril 1893 à Walkerton, petit village de l'Indiana aux Etats-Unis, dans une famille d'enseignants, Harold Clayton Urey est élevé par sa mère, très t6t veuve, et commence ses études dans des écoles provinciales plut6t médiocres, exerçant ensuite pendant trois ans comme instituteur. Puis il s'inscrit à l'Université de l'Indiana et à l'Université d'Etat du Montana. Etudiant en sciences, il marque une nette préférence pour la zoologie. Appelé à servir dans un laboratoire militaire durant la Première Guerre mondiale, il se découvre une passion pour la chimie, et comme il l'écrira plus tard, fait "une expérience fort heureuse car elle [l']a convaincu qu'[il n'était] pas fait pour la chimie industrielle; [il préférait] la recherche pure." Après la guerre, il est nommé moniteur de chimie à l'Université du Montana, et en 1921 commence à préparer une thèse à l'Université de Califomie. Sous la direction du célèbre thermodynamicien Gilbert Newton Lewis, il étudie l'entropie des gaz diatomiques, qu'il calcule à partir des spectres moléculaires. Ayant soutenu sa thèse en 1923, Urey se toume alors vers l'étude de la structure atomique et s'en va passer l'année 1923-1924 à l'Institut de Physique théorique de Copenhague, où Nils Bohr l'encourage à poursuivre dans cette voie. De retour aux Etats-Unis, il est chargé de recherches à l'Université Johns Hopkins, puis, de 1929 à 1945, il travaille à l'Université Columbia de New York, où il se consacre à l'étude des isotopes, publiant en 1930 un ouvrage, Les Atomes, les Molécules et les Quanta, en collaboration avec Arthur E. Ruark . De 1945 à 1958, il exerce à l'Université de Chicago, puis il est nommé professeur à l'Université de Califomie (à La Jolla), où il reste jusqu'à sa retraite.

24. Urey, Harold Clayton Pronunciation Key. urey, harold clayton , 18931981, American chemist, b United Press International)urey, harold clayton (18931981) http://www.infoplease.com/cgi-bin/id/CE053471

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia Urey, Harold Clayton E Pronunciation Key Urey, Harold Clayton Atoms, Molecules, and Quanta The Columbia Electronic Encyclopedia, urethra Urfa Related content from HighBeam Research on: Harold Clayton Urey Nobel Prize in Chemistry laureates. (United Press International) WINNERS OF THE NOBEL PRIZE IN CHEMISTRY (United Press International) Winners of the Nobel Prize in Chemistry. (United Press International) NOBEL PRIZE IN CHEMISTRY LAUREATES (United Press International) Urey, Harold Clayton (1893-1981) (The Hutchinson Dictionary of Scientific Biography) Biology: Major Biologists (The New York Public Library Science Desk Reference) Astronomy: Major Astronomers and Space Scientists (The New York Public Library Science Desk Reference) Useful Science Resources: Useful Science Information (The New York Public Library Science Desk Reference) GUILFORD COUNTY PROPERTY TRANSFERS.(TRIAD/STATE)

25. Urey, Harold Clayton encyclopediaEncyclopedia urey, harold clayton, yoor E Pronunciation Key. urey,harold clayton , 1893–1981, American chemist, b. Walkerton, Ind., grad. Univ. http://www.infoplease.com/cgi-bin/id/A0850185

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia Urey, Harold Clayton E Pronunciation Key Urey, Harold Clayton Atoms, Molecules, and Quanta The Columbia Electronic Encyclopedia, urethra Urfa Related content from HighBeam Research on: Harold Clayton Urey Nobel Prize in Chemistry laureates. (United Press International) WINNERS OF THE NOBEL PRIZE IN CHEMISTRY (United Press International) Winners of the Nobel Prize in Chemistry. (United Press International) NOBEL PRIZE IN CHEMISTRY LAUREATES (United Press International) Urey, Harold Clayton (1893-1981) (The Hutchinson Dictionary of Scientific Biography) Biology: Major Biologists (The New York Public Library Science Desk Reference) Astronomy: Major Astronomers and Space Scientists (The New York Public Library Science Desk Reference) Useful Science Resources: Useful Science Information (The New York Public Library Science Desk Reference) GUILFORD COUNTY PROPERTY TRANSFERS.(TRIAD/STATE)

26. Urey, Harold Clayton Pronunciation Key. urey, harold clayton , 18931981, American chemist, b United Press International)urey, harold clayton (18931981) http://www.infoplease.com/ce5/CE053471.html

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia Urey, Harold Clayton E Pronunciation Key Urey, Harold Clayton Atoms, Molecules, and Quanta The Columbia Electronic Encyclopedia, urethra Urfa Related content from HighBeam Research on: Harold Clayton Urey Nobel Prize in Chemistry laureates. (United Press International) WINNERS OF THE NOBEL PRIZE IN CHEMISTRY (United Press International) Winners of the Nobel Prize in Chemistry. (United Press International) NOBEL PRIZE IN CHEMISTRY LAUREATES (United Press International) Urey, Harold Clayton (1893-1981) (The Hutchinson Dictionary of Scientific Biography) Biology: Major Biologists (The New York Public Library Science Desk Reference) Astronomy: Major Astronomers and Space Scientists (The New York Public Library Science Desk Reference) Useful Science Resources: Useful Science Information (The New York Public Library Science Desk Reference) GUILFORD COUNTY PROPERTY TRANSFERS.(TRIAD/STATE)

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MSN Home My MSN Hotmail Shopping ... Money Web Search: logoImg('http://sc.msn.com'); Encarta Subscriber Sign In Help Home ... Upgrade to Encarta Premium Search Encarta Subscription Article MSN Encarta Premium: Get this article, plus 60,000 other articles, an interactive atlas, dictionaries, thesaurus, articles from 100 leading magazines, homework tools, daily math help and more for $4.95/month or $29.95/year (plus applicable taxes.) Learn more. This article is exclusively available for MSN Encarta Premium Subscribers. Already a subscriber? Sign in above. Urey, Harold Clayton Urey, Harold Clayton (1893-1981), American chemist and Nobel laureate, best known for his discovery of deuterium, or heavy hydrogen, H. Urey was born... Related Items discover of heavy water (deuterium oxide) discovery of deuterium 10 items Multimedia Selected Web Links The Nobel Prize in Chemistry 1934 1 item Sidebars SCIENTIFIC DISCOVERIES The Origin of the Earth Quotations Science: I thought it might have practical use in… Want more Encarta? Become a subscriber today and gain access to: Daily Math Help Literature Guides Researcher Tools Paper-Writing Guides 60,000 + articles

28. Urey, Harold Clayton urey, harold clayton yoor'E Pronunciation Key. urey, harold clayton , 18931981, American chemist, b. Walkerton, Ind., grad. Univ. of Montana (B.S., 1917), Ph.D. Univ. of California, 1923. http://www.factmonster.com/cgi-bin/id/A0850185

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29. Urey, Harold Clayton (1893-1981) urey, harold clayton (18931981) American physical chemist and Nobellaureate (1935) who, along with Stanley Miller, carried out http://www.daviddarling.info/encyclopedia/U/Urey.html

The Encyclopedia of Astrobiology, Astronomy, and Spaceflight FRONT PAGE NEWS ARCHIVE NEWSLETTER ... Z this site WWW Urey, Harold Clayton (1893-1981) American physical chemist and Nobel laureate (1935) who, along with Stanley Miller , carried out research into the possible make-up of Earth's primeval atmosphere and prebiotic evolution . During the birth of the space age in the 1950s, he was a major proponent of solar system exploration and the search for extraterrestrial life, becoming involved with the Apollo and Viking missions. He also investigated organic matter in meteorites. References 1. Urey, H. C. The Planets: Their Origin and Development . New Haven, Conn.: Yale University Press (1952). For more: var site="s13space1234"

30. LookSmart - Directory - Harold Clayton Urey YOU ARE HERE Home Sciences General Science Famous Scientists Biologists urey, harold clayton. harold clayton urey Learn http://search.looksmart.com/p/browse/us1/us317914/us53764/us226493/us330279/us33

@import url(/css/us/style.css); @import url(/css/us/searchResult1.css); Home IN the directory this category YOU ARE HERE Home Sciences General Science Famous Scientists ... Biologists Harold Clayton Urey - Learn about the American physical chemist who discovered heavy hydrogen and won the 1934 Nobel Prize. Directory Listings About Urey, Harold Clayton - Nobel Prize Internet Archive Learn facts about the American chemist who won a Nobel Prize in 1934 for discovering heavy hydrogen. Includes links to related subjects. Urey, Harold Clayton - Papers Visit the library at the Univ. of California at San Diego for a collection of papers written by the Nobel Prize-winning chemist. We're always looking for ways to improve your search experience. Tell us how we're doing. Join the Zeal community and help build the "Harold Clayton Urey" Directory Category IN the directory this category About Us Advertise with Us Advertiser Log-in Terms of Service

31. LookSmart - Directory - Harold Urey urey, harold clayton Biography of harold clayton urey Presents photos and a comprehensivebiography dedicated to this Nobel Prize winner, chemist, zoologist http://search.looksmart.com/p/browse/us1/us317914/us263953/us330310/us331243/

@import url(/css/us/style.css); @import url(/css/us/searchResult1.css); Home IN the directory this category YOU ARE HERE Home Sciences Chemistry Chemists Harold Urey - Features bios, photos, and research information pertaining to Nobel Prize-winning chemist Harold Urey. Directory Listings About allRefer Reference - Harold Clayton Urey (1893-1981) Take a look at the research work of the American chemist, who received the 1934 Nobel prize in chemistry. Known for isolating isotopes of oxygen, deuterium, and nitrogen. Encyclopedia.com - Harold Clayton Urey Students, researchers and chemistry buffs can find a brief biography, photos and career highlights for this Nobel Prize winner. Urey, Harold Clayton - Biography of Harold Clayton Urey Presents photos and a comprehensive biography dedicated to this Nobel Prize winner, chemist, zoologist, and nuclear physicist. Urey, Harold Clayton - Biography.com Presents a detailed summary of this Nobel Prize winner's long career, and discusses his contributions to chemistry. Urey, Harold Clayton - Eric's Treasure Troves

32. Harold Clayton Urey, April 29, 1893—January 5, 1981 | By James R. Arnold, Jacob harold clayton urey April 29, 1893 — January 5, 1981 By James R. Arnold,Jacob Bigeleisen, and Clyde A. Hutchison Jr. harold clayton urey. http://www.nap.edu/readingroom/books/biomems/hurey.html

BIOGRAPHICAL MEMOIRS National Academy of Sciences Harold Clayton Urey By James R. Arnold, Jacob Bigeleisen, and Clyde A. Hutchison Jr. HAROLD UREY WAS A scientist whose interests, accomplishments, and influence spanned the disciplines of chemistry, astronomy, astrophysics, geology, geophysics, and biology. Although he was meticulous in his attention to detail, his sights were always on broad questions at the forefront of knowledge. His unusual powers of concentration and capacity for hard work accounted for much of his success in exploring and opening up major new fields of research, including his discovery of deuterium and work on isotope chemistry, isotope separation, isotope geology, and cosmochemistry. Urey's approach to a new area began with his becoming thoroughly familiar with what was known about the subject of his curiosity and then the formulation of a theory to explain a large amount of uncorrelated material, which was then followed by carefully planned experiments. The latter frequently involved the design of new experimental equipment beyond the state of the art. As a graduate student in physical chemistry in the early 1920s, Urey realized that future progress in that discipline would require a knowledge of the quantum theory of atomic and molecular systems, which was undergoing a revolution in Europe. He supplemented his command of mathematics and physics by formal coursework prior to going to the Bohr Institute in Copenhagen in 1923. His exposure there led to his formulation of the concept of the electron spin concurrent with but less complete than the Goudsmit-Uhlenbeck discovery. After completion of his text with Arthur Ruark

33. Urey, Harold Clayton urey, harold clayton. US chemist. In 1932 he isolated heavy water andwas awarded the Nobel Prize for Chemistry in 1934 for his discovery http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0002678.html

Your browser does not support inline frames or is currently configured not to display inline frames. // Show bread crumbs navigation path. breadcrumbs('four'); //> ENCYCLOPAEDIA Hutchinson's Encyclopaedia Men's Health ... Wildlife Frames not supported Frames not supported Encyclopaedia Search Click a letter for the index A B C D ... Z Or search the encyclopaedia: Urey, Harold Clayton US chemist. In 1932 he isolated heavy water and was awarded the Nobel Prize for Chemistry in 1934 for his discovery of deuterium (heavy hydrogen). During World War II he was a member of the Manhattan Project, which produced the atomic bomb, and after the war he worked on tritium (another isotope of hydrogen, of mass 3) for use in the hydrogen bomb, but later he advocated nuclear disarmament and world government. makeButton("REFERENCE.HOME","R1") makeButtonNoSize("REFERENCE.HOME","R2") makeButton("REFERENCE.HOME","R3") makeButton("REFERENCE.HOME","R4") Your browser does not support inline frames or is currently configured not to display inline frames. servePixl("REFERENCE.HOME"); //accipter 1x1 pixel

34. Urey, Harold Clayton. The Columbia Encyclopedia, Sixth Edition. 2001 The Columbia Encyclopedia, Sixth Edition. 2001. urey, harold clayton. (y r´) (KEY) , 1893–1981, American chemist, b. Walkerton, Ind., grad. Univ. http://www.bartleby.com/65/ur/Urey-Har.html

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35. Urey, Harold Clayton. The American Heritage® Dictionary Of The English Language urey, harold clayton. The American Heritage® Dictionary of the English LanguageFourth Edition. 2000. 2000. urey, harold clayton. SYLLABICATION U·rey. http://www.bartleby.com/61/76/U0147600.html

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36. Harold Clayton Urey Translate this page harold clayton urey (1893 - 1981) Químico americano nascido em Walkerton,Indiana, e mais conhecido pela descoberta do deutério http://www.sobiografias.hpg.com.br/HarolCl2.html

Harold Clayton Urey H Niels Bohr na Universidade de Copenhagen (1923-1924). durante a Segunda Guerra Mundial, Com Arthur Edward Ruark Atoms, Molecules and Quanta (2 vol., 1930), e, sozinho, The Planets: Their Origin and Development (1952). Morreu Figura copidada da MSU CHEMISTRY HOME: http://poohbah.cem.msu.edu/ Nova B U S C A :

37. Harold Clayton Urey [Pictures And Photos Of] Percy Williams Bridgman, Arthur Holly Compton, Irving Langmuir, harold claytonurey. Item ID Bridgman Percy D2. Martin David Kamen, harold clayton urey. http://www.aip.org/history/esva/catalog/esva/Urey_Clayton.html

A larger image of any photo may be purchased. Click on an image to place an order. For more information visit our home page Percy Williams Bridgman, Arthur Holly Compton, Irving Langmuir, Harold Clayton Urey Description old age, profile, eyeglasses, suit, sitting; L-R: P.W. Bridgman, H. Urey, I. Langmuir, A. Compton, and unidentified man (at far right). Item ID Bridgman Percy D2 Martin David Kamen, Harold Clayton Urey Description l-r: Kamen; Urey; eyeglasses; standing; outdoors; talking; La Jolla Item ID Kamen C1 Zdenek Kopal, Homer Edward Newell, Harold Clayton Urey Description old age; suit; eyeglasses; table; microphone; L-R Zdenek Kopal, Harold Urey, Homer Newell Item ID Kopal Zdenek C1 Francis Wheeler Loomis, Harold Clayton Urey Description suit; standing; L-R Francis Loomis, Harold Urey Item ID Loomis Francis C2 Harold Clayton Urey Description old age; full-face; eyeglasses; suit; gesturing; standing; lunar background Item ID Urey A5 Harold Clayton Urey Description old age; full-face; suit; sitting Item ID Urey A6 Harold Clayton Urey Description old age; full-face; suit; sitting; viewing; books; desk; papers; office

38. Hideki Yukawa [Pictures And Photos Of] with Mrs. Yukawa? ; standing ; suit ; eyeglasses; outdoors. ItemID Yukawa C1. George von Hevesy, harold clayton urey, Hideki Yukawa....... http://www.aip.org/history/esva/catalog/esva/Yukawa_Hideki.html

A larger image of any photo may be purchased. Click on an image to place an order. For more information visit our home page Niels Henrik David Bohr, J. Robert Oppenheimer, Hideki Yukawa Description L-R: Bohr, N.; Yukama, Hideki; Mrs. Yukawa; Oppenheimer, J. Robert; old age; clasped hands; suit standing Credit: Niels Bohr Archive, courtest Emilio Segrè Visua Item ID Bohr N C49 Enrico Fermi, Hideki Yukawa Description L-R: Fermi, Yukawa ; standing ; outdoors ; Berkeley Item ID Fermi C39 Enrico Fermi, Emilio Gino Segrè, Gian Carlo Wick, Hideki Yukawa Description L-R: Fermi, Segrè, Yukawa, Wick ; standing outdoors ; Berkeley Item ID Fermi D14 Enrico Fermi, Emilio Gino Segrè, Hideki Yukawa Description middle age, full-face, suit, standing, outdoors; L-R: E. Fermi, E. Segrè, H. Yukawa. Item ID Fermi Enrico C52 Ernest Orlando Lawrence, Robert Serber, Hideki Yukawa Description L-R: Yukawa, Lawrence, Mrs. Yukawa, Serber ; standing ; outdoors ; Lawrence Radiation Laboratory Item ID Lawrence D1 Abraham Pais, Hideki Yukawa Description L-R: Pais, Mrs. Yukawa, Yukawa ; standing ; outdoors ; smiling

39. Harold Clayton Urey (1893-1981) Translate this page harold clayton urey (1893-1981). harold clayton urey nasceu no estadonorte-americano de Indiana a 29 de Abril de 1893, falecendo http://www.if.ufrj.br/teaching/biog/b0034.html

Harold Clayton Urey (1893-1981) Harold Clayton Urey nasceu no estado norte-americano de Indiana a 29 de Abril de 1893, falecendo na Califórnia a 5 de Janeiro de 1981. Formou-se na Universidade de Montana (1917), doutorou-se em Química na Universidade da Califórnia (1923), e especializou-se em Física atómica com Niels Bohr na Universidade de Copenhaga (1923-1924). Foi galardoado com o Prémio Nobel da Química (1934), por ter conseguido obter o deutério Durante a Segunda Guerra Mundial dirigiu as investigações sobre os métodos de separação do isótopo do urânio U-235, e de produção de água pesada. Desempenhou papel de relevo na preparação da bomba atómica. Dedicou-se ainda ao problema da origem da Terra e ao do oxigénio 18 para determinar as temperaturas pré-históricas.

40. Harold Clayton Urey --  Britannica Student Encyclopedia urey, harold clayton Britannica Student Encyclopedia. , urey, haroldclayton (1893–1981). The American scientist harold clayton http://www.britannica.com/ebi/article?eu=299681&query=harold clayton lloyd&ct=eb

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