Eccles, Sir John Carew
- ▪ 1998Australian neurophysiologist (b. Jan. 27, 1903, Melbourne, Australia—d. May 2, 1997, Contra, Switz.), discovered many aspects of the vertebrate nervous system, notably how nerve impulses are transmitted between neurons, or nerve cells, work for which he shared the 1963 Nobel Prize for Physiology or Medicine with Alan L. Hodgkin and Andrew F. Huxley. Eccles's prizewinning research showed that one neuron communicates with a closely adjacent neuron by releasing chemicals into the synapse, the narrow space between the two cells. The chemicals, called neurotransmitters, cross the synapse and bind to the second cell, either activating or inhibiting it. His findings resolved a long-standing debate over whether nerve cell communication occurs through chemical or electrical means. Eccles studied biology and medicine at Melbourne University (M.B. and B.S; 1925), where he qualified for a Rhodes scholarship. At the University of Oxford, he studied with leading neurophysiologist Sir Charles Scott Sherrington. After graduating (1929; Ph.D.) Eccles taught and conducted research at Oxford until 1937, when he returned to Australia to become director of the Kanematsu Memorial Institute of Pathology, Sydney. During World War II he was a medical consultant to the Australian army. Eccles then served (1944-51) as professor of physiology at the University of Otago, Dunedin, N.Z., before heading (1952-66) the physiology department at the Australian National University, Canberra. Facing mandatory retirement, he left Australia and continued his work (1966-68) at the Institute for Biomedical Research, Chicago, and the State University of New York at Buffalo, where he was distinguished professor of physiology (1968-75). He was elected (1941) to the Royal Society of London and received (1962) the Royal Medal. He served as president of the Australian Academy of Science (1957-61) and was knighted in 1958. In addition to the more than 500 scientific papers that he published, Eccles was the author of a number of books, including the purely scientific The Physiology of Nerve Cells (1957) and the philosophical Facing Reality: Philosophical Adventures by a Brain Scientist (1970).
* * *▪ Australian physiologistborn Jan. 27, 1903, Melbourne, Australiadied May 2, 1997, Contra, Switz.Australian research physiologist who received (with Alan Hodgkin (Hodgkin, Sir Alan) and Andrew Huxley (Huxley, Sir Andrew Fielding)) the 1963 Nobel Prize for Physiology or Medicine for his discovery of the chemical means by which impulses are communicated or repressed by nerve cells (neurons (neuron)).After graduating from the University of Melbourne in 1925, Eccles studied at the University of Oxford under a Rhodes scholarship. He received a Ph.D. there in 1929 after having worked under the neurophysiologist Charles Scott Sherrington. He held a research post at Oxford before returning to Australia in 1937, teaching there and in New Zealand over the following decades.Eccles conducted his prizewinning research while at the Australian National University, Canberra (1951–66). He demonstrated that one nerve cell communicates (action potential) with a neighbouring cell by releasing chemicals into the synapse (the narrow cleft, or gap, between the two cells). He showed that the excitement of a nerve cell by an impulse causes one kind of synapse to release into the neighbouring cell a substance (probably acetylcholine) that expands the pores in nerve membranes. The expanded pores then allow free passage of sodium ions into the neighbouring nerve cell and reverse the polarity of electric charge. This wave of electric charge, which constitutes the nerve impulse, is conducted from one cell to another. In the same way, Eccles found, an excited nerve cell induces another type of synapse to release into the neighbouring cell a substance that promotes outward passage of positively charged potassium ions across the membrane, reinforcing the existing polarity and inhibiting the transmission of an impulse. (See also action potential.)Eccles's research, which was based largely on the findings of Hodgkin and Huxley, settled a long-standing controversy over whether nerve cells communicate with each other by chemical or by electric means. His work had a profound influence on the medical treatment of nervous diseases and research on kidney, heart, and brain function.Among his scientific books are Reflex Activity of the Spinal Cord (1932), The Physiology of Nerve Cells (1957), The Inhibitory Pathways of the Central Nervous System (1969), and The Understanding of the Brain (1973). He also wrote a number of philosophical works, including Facing Reality: Philosophical Adventures by a Brain Scientist (1970) and The Human Mystery (1979).
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Eccles,Sir John Carew — Ec·cles (ĕkʹəlz), Sir John Carew. 1903 1997. Australian physiologist. He shared a 1963 Nobel Prize for research on nerve cells. * * * … Universalium
Eccles , Sir John Carew — (1903–1997) Australian physiologist Born in Melbourne, Australia, Eccles was educated at the university there and at Oxford University. In Oxford he worked with Charles Sherrington on muscular reflexes and nervous transmission across the synapses … Scientists
Sir John Carew Eccles — noun Australian physiologist noted for his research on the conduction of impulses by nerve cells (1903 1997) • Syn: ↑Eccles, ↑John Eccles • Instance Hypernyms: ↑physiologist … Useful english dictionary
John Carew Eccles — Sir John Carew Eccles AC (* 27. Januar 1903 in Melbourne; † 2. Mai 1997 in Locarno) war ein australischer Physiologe und Nobelpreisträger. Mit seinen Forschungen zur Reizweiterleitung von Nervenzellen trug er entscheidend dazu bei, die Vorgänge… … Deutsch Wikipedia
John Carew Eccles — Infobox Scientist name = Sir John Eccles image width = 150px caption = John Eccles, shown here at his lab bench birth date = birth date|1903|1|27|mf=y birth place = Melbourne, Australia death date = death date and age|1997|5|2|1903|1|27 death… … Wikipedia
John Carew Eccles — El psiquíatra de Bohemia Cyril Höschl y Sir John Carew Eccles (1993). Sir John Carew Eccles ( * 27 de enero de 1903; Northcote, Victoria, Australia 2 de mayo de 1997, Locarno, Suiza) fue un neurofisiólogo australiano. Estudió medicina en la… … Wikipedia Español
John Carew Eccles — Pour les articles homonymes, voir Eccles (homonymie). Eccles et Hoschl. Sir John Carew Eccles, né le 27 janvier 1903 à … Wikipédia en Français
Medizinnobelpreis 1963: John Carew Eccles — Alan Lloyd Hodgkin — Andrew Fielding Huxley — Die drei Physiologen wurden gemeinsam für ihre Entdeckungen bezüglich der ionischen Mechanismen, die bei Erregung und Hemmung in peripheren und zentralen Bereichen der Nervenzellenmembran eine Rolle spielen, ausgezeichnet. Biografien Sir… … Universal-Lexikon
Eccles — Sir John Carew … Scientists
Eccles — noun Australian physiologist noted for his research on the conduction of impulses by nerve cells (1903 1997) • Syn: ↑John Eccles, ↑Sir John Carew Eccles • Instance Hypernyms: ↑physiologist … Useful english dictionary