Hartline, Haldan Keffer hartline, haldan keffer. (b. Dec. 22, 1903, Bloomsburg, Pa., USd. March 17,1983, Fallston, Md.), American physiologist who was a cowinner (with George http://www.britannica.com/nobel/micro/260_49.html
Extractions: (b. Dec. 22, 1903, Bloomsburg, Pa., U.S.d. March 17, 1983, Fallston, Md.), American physiologist who was a cowinner (with George Wald and Ragnar Granit ) of the 1967 Nobel Prize in Physiology or Medicine for his work in analyzing the neurophysiological mechanisms of vision. Hartline began his study of retinal electrophysiology as a National Research Council Fellow at Johns Hopkins University, Baltimore, receiving his M.D. in 1927. After attending the universities of Leipzig and Munich as an Eldridge Johnson traveling research scholar, he became professor of biophysics and chairman of the department at Johns Hopkins in 1949. He joined the staff of Rockefeller University, New York City, in 1953 as professor of neurophysiology. Hartline investigated the electrical responses of the retinas of certain arthropods, vertebrates, and mollusks because their visual systems are much simpler than those of humans and are thus easier to study. He concentrated his studies on the eye of the horseshoe crab ( Limulus polyphemus ). Using minute electrodes in his experiments, he obtained the first record of the electrical impulses sent by a single optic nerve
Hartline, Haldan Keffer haldan keffer hartline was born in Bloomsburg, Pennsylvania, on December 22nd, 1903.His parents were teachers there in the State Normal School (now http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/H/Hartline/Hartl
Extractions: Hartline, Haldan Keffer Haldan Keffer Hartline was born in Bloomsburg, Pennsylvania, on December 22nd, 1903. His parents were teachers there in the State Normal School (now Bloomsburg State College) where he received his early education. His father, Daniel S. Hartline, was Professor of Biology, but a man whose wide interests also included Astronomy and Geology. It was through his father that Keffer became interested in Natural Sciences. Keffer Hartline attended Lafayette College in Easton, Pennsylvania, graduating in 1923 (B. Sc.). His college teacher of biology, Beverly W. Kunkel, encouraged him to undertake research; his first scientific paper concerned visual responses of land isopods. Summers at the Marine Biological Laboratory at Woods Hole added to his biological training; there he was especially influenced by Jacques Loeb, Selig Hecht, and Merkel H. Jacobs. In the autumn of 1923 he entered the Johns Hopkins School where he was encouraged to continue his research interest in vision in the Department of Physiology under E. K. Marshall and C. D. Snyder. Dr. Snyder let him use his Einthoven string galvanometer with which Hartline undertook the study of the retinal action potential using frogs, decerebrate cats and rabbits. He learned to obtain electroretinograms from intact animals, and recorded clearly recognizable retinal action potentials from human subjects. He also used intact insects for quantitative studies.
Encyclopedia: Haldan Keffer Hartline Other descriptions of haldan keffer hartline. haldan keffer hartline (December22, 1903 March 17, 1983) was an American physiologist who was a cowinner http://www.nationmaster.com/encyclopedia/Haldan-Keffer-Hartline
Extractions: Related Articles People who viewed "Haldan Keffer Hartline" also viewed: George Wald Horseshoe crab Arthropod Erik Estrada What's new? Our next offering Latest newsletter Student area Lesson plans Recent Updates Zheng He Zeus Yukon general election, 2006 Yoji Biomehanika ... More Recent Articles Top Graphs Richest Most Murderous Most Taxed Most Populous ... More Stats Updated 217 days 5 hours 3 minutes ago. Other descriptions of Haldan Keffer Hartline Haldan Keffer Hartline December 22 March 17 ) was an American physiologist who was a cowinner (with George Wald and Ragnar Granit ) of the Nobel Prize in Physiology or Medicine for his work in analyzing the neurophysiological mechanisms of vision. Hartline began his study of retinal electrophysiology as a National Research Council Fellow at Johns Hopkins University Baltimore , receiving his M.D. in . After attending the universities of Leipzig and Munich as an Eldridge Johnson traveling research scholar, he became professor of biophysics and chairman of the department at Johns Hopkins in . He joined the staff of Rockefeller University New York City , in as professor of neurophysiology.
Encyclopedia: Retina haldan keffer hartline (December 22, 1903 March 17, 1983) was an Americanphysiologist who was a cowinner (with George Wald and Ragnar Granit) of the 1967 http://www.nationmaster.com/encyclopedia/Retina
Extractions: Related Articles People who viewed "Retina" also viewed: Rod cell Photoreceptor cell Cone cell Eye ... Ciliary body What's new? Our next offering Latest newsletter Student area Lesson plans Recent Updates Zheng He Zeus Yukon general election, 2006 Yoji Biomehanika ... More Recent Articles Top Graphs Richest Most Murderous Most Taxed Most Populous ... More Stats Updated 41 days 14 hours 19 minutes ago. Other descriptions of Retina Human eye cross-sectional view. Courtesy NIH National Eye Institute . Many animals have eyes different from the human eye. The retina is a thin layer of cells at the back of the eyeball of vertebrates and some cephalopods ; it is the part of the eye which converts light into nervous signals. An eye is an organ that detects light. ... The National Institutes of Health is an institution of the United States government which focuses on medical research. ... The National Eye Institute (NEI) is one of the US National Institutes of Health that was established in 1968. ... An eye is an organ that detects light. ...
George Wald -- Facts, Info, And Encyclopedia Article (Click link for more info and facts about haldan keffer hartline) haldan kefferhartline haldan keffer hartline Julius Axelrod Antonio Damasio http://www.absoluteastronomy.com/encyclopedia/G/Ge/George_Wald.htm
Extractions: George Wald (November 18, 1906April 12, 1997) was an (A native or inhabitant of the United States) American (A person with advanced knowledge of one of more sciences) scientist who is best known for his work with pigments in the (The light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve) retina . He won a share of the 1967 (Click link for more info and facts about Nobel Prize in Physiology or Medicine) Nobel Prize in Physiology or Medicine with (Click link for more info and facts about Haldan Keffer Hartline) Haldan Keffer Hartline and (Click link for more info and facts about Ragnar Granit) Ragnar Granit As a postdoctoral researcher, Wald discovered that (Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes) vitamin A was a component of the retina. His further experiments showed that when the pigment (A red photopigment in the retinal rods of vertebrates; dissociates into retinene by light)
NASA Neurolab Web: Mission Home Page haldan keffer hartline (19031983), American biophysicist, first determined themechanics of how the nerves of the visual system receive information and http://neurolab.jsc.nasa.gov/hartline.htm
Extractions: Haldan Keffer Hartline (1903-1983), American biophysicist, first determined the mechanics of how the nerves of the visual system receive information and transfer it to the brain. He was born in Bloomsburg, Pennsylvania. Hartline worked with horseshoe crabs and frogs to investigate the mechanisms of vision. His discoveries convinced researchers that the retina (the innermost layer of the eye that is light sensitive) and optic nerves themselves process many nerve signals before the signals are transmitted to the brain. Besides providing new knowledge about the neurophysiological mechanisms of vision, Hartline's research contributed to advances in night-vision, pattern-recognition, and motion-detection devices. He shared the 1967 Nobel Prize in physiology or medicine with Swedish neurophysiologist Ragnar Granit and American biochemist George Wald for their work on the biochemical and electrical processes of vision. Curator: Julie Heath and Jacque Havelka
Entrez PubMed Nobel prize for George Wald, haldan keffer hartline and Ragner Granit in 1967for discoveries concerning the primary biochemical and physiological http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=4
Extractions: U.S. physiologist. He received his M.D. from Johns Hopkins University. Experimenting on horseshoe crabs, he was the first to record the electrical impulses sent by a single optic-nerve fibre. He found that when one of the eye's receptor cells is stimulated, others nearby are depressed, enhancing contrast and sharpening perception of shapes. He showed how simple retinal mechanisms constitute vital steps in the integration of visual information. In 1967 he shared a Nobel Prize with George Wald and Ragnar Arthur Granit var mm = [["Jan.","January"],["Feb.","February"],["Mar.","March"],["Apr.","April"],["May","May"],["June","June"],["July","July"],["Aug.","August"],["Sept.","September"],["Oct.","October"],["Nov.","November"],["Dec.","December"]]; To cite this page: MLA style: "Hartline, Haldan Keffer." Britannica Concise Encyclopedia http://concise.britannica.com/ebc/article-9366668
Extractions: U.S. biochemist. vitamin A , the mechanisms of the photochemical reaction s in the rod cells that enable night vision, and the identification of the colour-sensitive pigments in the cone cells ( see photoreception retina ). He shared the Nobel Prize in 1967 with Haldan Keffer Hartline and Ragnar Arthur Granit . He was a prominent opponent of the Vietnam War. var mm = [["Jan.","January"],["Feb.","February"],["Mar.","March"],["Apr.","April"],["May","May"],["June","June"],["July","July"],["Aug.","August"],["Sept.","September"],["Oct.","October"],["Nov.","November"],["Dec.","December"]]; To cite this page: MLA style: "Wald, George." Britannica Concise Encyclopedia http://concise.britannica.com/ebc/article-9382237
Haldan Keffer Hartline Biography .ms haldan keffer hartline. See also. Quotations. haldan keffer hartline (December22, 1903 March 17, 1983) was an American physiologist who was a cowinner http://haldan-keffer-hartline.biography.ms/
Extractions: See also Haldan Keffer Hartline December 22 March 17 ) was an American physiologist who was a cowinner (with George Wald and Ragnar Granit ) of the Nobel Prize in Physiology or Medicine for his work in analyzing the neurophysiological mechanisms of vision. Hartline began his study of retinal electrophysiology as a National Research Council Fellow at Johns Hopkins University Baltimore , receiving his M.D. in . After attending the universities of Leipzig and Munich as an Eldridge Johnson traveling research scholar, he became professor of biophysics and chairman of the department at Johns Hopkins in . He joined the staff of Rockefeller University New York City , in as professor of neurophysiology. Hartline investigated the electrical responses of the retinas of certain arthropods, vertebrates, and mollusks because their visual systems are much simpler than those of humans and are thus easier to study. He concentrated his studies on the eye of the horseshoe crab (Limulus polyphemus). Using minute electrodes in his experiments, he obtained the first record of the electrical impulses sent by a single optic nerve fibre when the receptors connected to it are stimulated by light. He found that the receptor cells in the eye are interconnected in such a way that when one is stimulated, others nearby are depressed, thus enhancing the contrast in light patterns and sharpening the perception of shapes. Hartline thus built up a detailed understanding of the workings of individual photoreceptors and nerve fibres in the retina, and he showed how simple retinal mechanisms constitute vital steps in the integration of visual information.
Ragnar Granit - By Yrsa Neuman/Gunnar Damström At the same time British physiologist haldan keffer hartline conducted researchat the University of Philadelphia. In Pennsylvania Granit had the http://sfhs.eget.net/P_articles/Q_artiklar/Q_Granit.html
Extractions: At the University of Philadelphia Ragnar Granit had large research facilities at his disposal and received generous grants for acquisition of research equipment. At the same time British physiologist Haldan Keffer Hartline conducted research at the University of Philadelphia. In Pennsylvania Granit had the opportunity to experimantally test his theory on the nervous layer of the retina and its importance for seeing. Granit wished to research whether the retina had separate receptors for the different components of solar light, in other words about the way the eye sees color. Granit reached conclusions similar to those of the classics of color vision theory the early English physicist Thomas Young and the German physicist and physiologist Hermann von Helmholz : that the retina has three color sensitive layers. It turned out that the eye entails a kind of nerve center that prepares the information for the brain and for the actual way there. At the Carolinian Institute Granit focused his research on how the spinal marrow and the brain exert muscular control. He retired in 1967, the same year he shared the Nobel Price with Hartline and George Wald for his discoveries concerning the physiological and chemical foundations of vision. He passed away in 1991.
Biografia De Hartline, Haldan Keffer Translate this page hartline, haldan keffer. (1903-83) Científico norteamericano, n. en Bloomsburg (Pa.)y m. en Fallston. Especializado en biofísica, realizó estudios en el http://www.biografiasyvidas.com/biografia/h/hartline.htm
Extractions: Inicio Buscador Las figuras clave de la historia Reportajes Los protagonistas de la actualidad Hartline, Haldan Keffer (1903-83) Científico norteamericano, n. en Bloomsburg (Pa.) y m. en Fallston. Especializado en biofísica, realizó estudios en el Lafayette College, la Universidad Johns Hopkins y en Leipzig y Munich, habiendo realizado actividades docentes en el Cornell University Medical College y en la Universidad de Pensilvania. En 1967 le fue otorgado el premio Nobel de Fisiología y Medicina junto a George Wald y Ragnar Granit. Los trabajos de investigación por los que Hartline había merecido tan alta distinción académica se referían a la transmisión de impulsos nerviosos del ojo al cerebro y el comportamiento de las fibras ópticas en las variaciones de la luz, para lo cual había tenido que emplear microelectrodos que aislaban las fibras y registraban sus reacciones al paso de la luz hasta la retina. Inicio Buscador Recomendar sitio
HARTline: Information From Answers.com haldan keffer hartline Brand alliances Ragnar Granit List of towns inWashington hartline, Washington Ybor City Paul Greengard 1967 in science http://www.answers.com/topic/hartline
Extractions: showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping HARTline Wikipedia HARTline HARTline logo HARTline provides public transportation for Hillsborough County Florida . The prefix of HARTline is an acronym that stands for "Hillsborough Area Regional Transit Authority". HARTline provides bus service and manages the TECO Line Streetcar System This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see Mentioned In HARTline is mentioned in the following topics: Haldan Keffer Hartline Brand alliances Ragnar Granit List of towns in Washington ... George Wald Wikipedia information about HARTline This article is licensed under the GNU Free Documentation License . It uses material from the Wikipedia article "HARTline" More from Wikipedia Your Ad Here Jump to: Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping Send this page Print this page Link to this page Tell me about: Home About Tell a Friend Buzz ... Site Map
1949: Information From Answers.com haldan keffer hartline b. Bloomsburg, Pennsylvania, December 22, 1903, d.Fallston, Maryland, March 17, 1983 resumes his study of reactions in a single http://www.answers.com/topic/1949
