Biographies Of Haldan Keffer Hartline Biographies of Hartline Haldan Keffer and more Hartline Haldan Keffer biography. http://www.biography-center.com/biographies/1380-Hartline_Haldan_Keffer.html
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Hartline, Haldan Keffer - Hutchinson Encyclopedia Article About US physiologist who was awarded a Nobel Prize for Physiology or Medicine in 1967 with Ragnar Granit and George Wald for their work on the physiology and chemistry of vision. http://encyclopedia.farlex.com/Hartline, Haldan Keffer
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¹þÌØÀ¼_°Ù¶È°Ù¿Æ Hartline, Haldan Keffer (19031983) was an American physiologist. He shared the 1967 Nobel Prize in physiology or medicine for his work on the neuro-physiology of vision. http://baike.baidu.com/view/447385.htm
Category:1903 Births - Wikipedia, The Free Encyclopedia Pages in category 1903 births The following 200 pages are in this category, out of 2,943 total. This list may not reflect recent changes . http://en.wikipedia.org/wiki/Category:1903_births
Hartline, Haldan Keffer US physiologist who was awarded a Nobel Prize for Physiology or Medicine in 1967 with Ragnar Granit and George Wald for their work on the physiology and chemistry of vision. http://encyclopedia.farlex.com/Haldan Keffer Hartline
Haldan Keffer Hartline Facts - Freebase Facts and figures about Haldan Keffer Hartline, taken from Freebase, the world's database. http://www.freebase.com/view/en/haldan_keffer_hartline
Haldan Keffer Hartline — FactMonster.com More on Haldan Keffer Hartline from Fact Monster Nobel Prizes (table) Nobel Prizes Year Peace Chemistry Physics Physiology or Medicine Literature 1901 J. H. Dunant http://www.factmonster.com/ce6/people/A0935344.html
Extractions: Reference Desk Encyclopedia Hartline, Haldan Keffer, Wald and Ragnar Granit for their discoveries concerning the primary physiological and chemical visual processes in the eye. Hartline studied the eye of the horseshoe crab and determined that stimulation of one of the receptor cells in the eye is accompanied by depression of the nearby cells, resulting in enhanced contrast and shape perception. The Columbia Electronic Encyclopedia, Atlas ... Encyclopedia Click Here! Click Here! 24 x 7 Tutor Availability Unlimited Online Tutoring 1-on-1 Tutoring Explore Slope Formula Fractions Contact Us Advertise with Fact Monster ... Privacy
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Extractions: 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 from the University of Pennsylvania , he returned to the United States to take a position in the Eldridge Reeves Johnson Foundation for Medical Physics at Penn, which was under the directorship of Detlev W. Bronk at that time. In 1940-1941 he was Associate Professor of Physiology at Cornell Medical College in New York City, but returned to Penn and stayed until 1949. Then he became professor of biophysics and chairman of the department at Johns Hopkins in 1949. One of Hartline's graduate students at Johns Hopkins, Paul Greengard , later also won the Nobel Prize. Hartline joined the staff of
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Hartline, Haldan Keffer Hartline, Haldan Keffer (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 http://www.uv.es/EBRIT/micro/micro_260_49.html
Extractions: Britannica CD Index Articles Dictionary Help (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 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.
Haldan Keffer Hartline — Infoplease.com More on Haldan Keffer Hartline from Infoplease Hartline meaning and definitions Hartline Definition and Pronunciation; Nobel Prizes (table) - Nobel Prizes Year Peace http://www.infoplease.com/ce6/people/A0935344.html
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