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Gunnar Svaetichin (scientist)
Gunnar Nils Toivo Svaetichin (13 January 1915 – 23 March 1981) was a Swedish-Finnish- Venezuelan physiologist who, in 1956, showed by examining the external layers of fish retinas that electroretinograms display particular sensitivity to three different groups of wavelengths in the areas of blue, green and red. This provided the first biological demonstration in support of the Young-Helmholtz trichromatic theory. He also gave name to the S-potential, which was the first experimental evidence that opponency existed in the visual system. Born in Finland, he moved to Sweden in 1948, and from 1955 until his death, he worked as a researcher in Venezuela. Early life and family He was born in 1915 in Karis, Finland, the son of the engineering surveyor Volmar Svaetichin and his wife Ellen (born Nordstrom). Education After attending schools in Karis and Helsinki, he went on to graduate from medical school at the University of Helsinki, where he also worked as a researcher. During hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karis
Karis (; fi, Karjaa ) is a town and former municipality in Finland. On January 1, 2009, it was consolidated with Ekenäs and Pohja to form the new municipality of Raseborg; fi, Raasepori. It is located in the Finnish province of Southern Finland and is part of Uusimaa, one of the regions of Finland. The town had a population of 9,155 (as of 31 December 2008) and covered a land area of . The population density was . The municipality was bilingual, with a majority (59%) being Swedish language speakers and a minority (38%) being Finnish language speakers. Karis railway station is on both the ' line, connecting Helsinki Central railway station and Turku Central railway station; and on the Hanko–Hyvinkää railway where it is the junction station for branch line services to Hanko railway station. By driving along the national road 51 to Helsinki, the minimum distance is about 75 kilometers. Stage magician Simo Aalto came from the town. See also *Ingå * Junkarsborg * Virkk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Visual System
The visual system comprises the sensory organ (the eye) and parts of the central nervous system (the retina containing photoreceptor cells, the optic nerve, the optic tract and the visual cortex) which gives organisms the sense of sight (the ability to perception, detect and process visible light) as well as enabling the formation of several non-image photo response functions. It detects and interprets information from the optical spectrum perceptible to that species to "build a representation" of the surrounding environment. The visual system carries out a number of complex tasks, including the reception of light and the formation of monocular neural representations, colour vision, the neural mechanisms underlying stereopsis and assessment of distances to and between objects, the identification of a particular object of interest, motion perception, the analysis and integration of visual information, pattern recognition, accurate motor coordination under visual guidance, and mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1981 Deaths
Events January * January 1 ** Greece enters the European Economic Community, predecessor of the European Union. ** Palau becomes a self-governing territory. * January 10 – Salvadoran Civil War: The Farabundo Martí National Liberation Front, FMLN launches its first major offensive, gaining control of most of Morazán Department, Morazán and Chalatenango Department, Chalatenango departments. * January 15 – Pope John Paul II receives a delegation led by Polish Solidarity (Polish trade union), Solidarity leader Lech Wałęsa at the Vatican City, Vatican. * January 20 – Iran releases the 52 Americans held for 444 days, minutes after Ronald Reagan is First inauguration of Ronald Reagan, sworn in as the 40th President of the United States, ending the Iran hostage crisis. * January 21 – The first DMC DeLorean, DeLorean automobile, a stainless steel sports car with gull-wing doors, rolls off the production line in Dunmurry, Northern Ireland. * January 24 – An 1981 Dawu ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1915 Births
Events Below, the events of World War I have the "WWI" prefix. January * January – British physicist Sir Joseph Larmor publishes his observations on "The Influence of Local Atmospheric Cooling on Astronomical Refraction". *January 1 ** WWI: British Royal Navy battleship HMS ''Formidable'' is sunk off Lyme Regis, Dorset, England, by an Imperial German Navy U-boat, with the loss of 547 crew. ** Battle of Broken Hill: A train ambush near Broken Hill, New South Wales, Australia, is carried out by two men (claiming to be in support of the Ottoman Empire) who are killed, together with 4 civilians. * January 5 – Joseph E. Carberry sets an altitude record of , carrying Capt. Benjamin Delahauf Foulois as a passenger, in a fixed-wing aircraft. * January 12 ** The United States House of Representatives rejects a proposal to give women the right to vote. ** '' A Fool There Was'' premières in the United States, starring Theda Bara as a '' femme fatale''; she quickly become ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finnish Physiologists
Finnish may refer to: * Something or someone from, or related to Finland * Culture of Finland * Finnish people or Finns, the primary ethnic group in Finland * Finnish language, the national language of the Finnish people * Finnish cuisine See also * Finish (other) * Finland (other) * Suomi (other) Suomi means ''Finland'' in Finnish. It may also refer to: *Finnish language * Suomi (surname) * Suomi, Minnesota, an unincorporated community * Suomi College, in Hancock, Michigan, now referred to as Finlandia University * Suomi Island, Western ... * {{disambiguation Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Venezuelan Institute For Scientific Research
The Venezuelan Institute for Scientific Research (IVIC), or ''Instituto Venezolano de Investigaciones Cientificas'', is a scientific research institute and graduate training center in Venezuela founded by government decree on February 9, 1959. It has its origins in the Venezuelan Institute of Neurology and Brain Research ('IVNIC', In Spanish: Instituto Venezolano de Neurología e Investigaciones Cerebrales), which Humberto Fernández Morán, Humberto Fernandez-Moran founded in 1955. The center has the Marcel Roche Library, recognized in 1996 by UNESCO as being "the best Regional Library for Science and Technology". The headquarters of the IVIC is located near San Antonio de los Altos, in Altos de Pipe, Miranda State. The grounds cover 832-acre headquarters, where are the scientific and academic facilities, residences for researchers, students and staff, storeroom, dining, administration and service area, library, etc. Within this area there are some pockets of tropical cloud forest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter War
The Winter War,, sv, Vinterkriget, rus, Зи́мняя война́, r=Zimnyaya voyna. The names Soviet–Finnish War 1939–1940 (russian: link=no, Сове́тско-финская война́ 1939–1940) and Soviet–Finland War 1939–1940 (russian: link=no, Сове́тско-финляндская война́ 1939–1940) are often used in Russian historiographybr>В.Н. Барышников. От прохладного мира к Зимней войне. Восточная политика Финляндии в 1930–е годы. Санкт-Петербург, 1997.; О.Д. Дудорова. Неизвестные страницы Зимней войны. In: Военно-исторический журнал. 1991. №9.; Зимняя война 1939–1940. Книга первая. Политическая история. М., 1998. – ; ttp://www.otvaga2004.narod.ru/photo/winterwar/wwar1.htm М. Коломиец. Танки в Зимней войне 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yngve Zotterman
Yngve Zotterman (20 September 1898 in Vadstena – 13 March 1982 in Stockholm) was a Swedish neurophysiologist who received his medical training at the Karolinska Institute. He conducted pioneering studies on nerve conduction together with Edgar Adrian. He then worked on sensory function of skin, particularly related to pain, heat and the neurochemistry of taste buds. He was elected a member of the Royal Swedish Academy of Engineering Sciences in 1949, and of the Royal Swedish Academy of Sciences in 1953. See also *Rate coding Neural coding (or Neural representation) is a neuroscience field concerned with characterising the hypothetical relationship between the stimulus and the individual or ensemble neuronal responses and the relationship among the electrical activity ... References 1898 births 1982 deaths Swedish neuroscientists Karolinska Institute alumni Members of the Royal Swedish Academy of Engineering Sciences Members of the Royal Swedish Academy of Sciences ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ragnar Granit
Ragnar Arthur Granit (30 October 1900 – 12 March 1991) was a Finnish-Swedish scientist who was awarded the Nobel Prize in Physiology or Medicine in 1967 along with Haldan Keffer Hartline and George Wald "for their discoveries concerning the primary physiological and chemical visual processes in the eye". Early life and education Ragnar Arthur Granit was born on 30 October 1900 in Riihimäki, Finland, at the time part of the Russian Empire, into a Swedish-speaking Finnish family. Granit was raised in Oulunkylä, a suburb of the Finnish capital of Helsinki, and attended the Svenska normallyceum in Helsinki. Granit graduated from the Faculty of Medicine at the University of Helsinki in 1927. Career and research In 1940, when Finland became the target of a massive Soviet attack during the Winter War, Granit sought refuge – and peaceful surroundings for his studies and research work – in Stockholm, the capital of neighbouring Sweden, at the age of 40. In 1941, Granit rec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Helsinki
The University of Helsinki ( fi, Helsingin yliopisto, sv, Helsingfors universitet, abbreviated UH) is a public research university located in Helsinki, Finland since 1829, but founded in the city of Turku (in Swedish ''Åbo'') in 1640 as the Royal Academy of Åbo, at that time part of the Swedish Empire. It is the oldest and largest university in Finland with the widest range of disciplines available. In 2020, around 31,600 students were enrolled in the degree programs of the university spread across 11 faculties and 11 research institutes. As of 1 August 2005, the university complies with the harmonized structure of the Europe-wide Bologna Process and offers bachelor, master, licenciate, and doctoral degrees. Admission to degree programmes is usually determined by entrance examinations, in the case of bachelor's degrees, and by prior degree results, in the case of master and postgraduate degrees. Entrance is particularly selective (circa 15% of the yearly applicants are admi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gunnar Svaetichin In His Student Cap
Gunnar is a male first name of Nordic origin (''Gunnarr'' in Old Norse). The name Gunnar means fighter, soldier, and attacker, but mostly is referred to by the Viking saying which means Brave and Bold warrior (''gunnr'' "war" and ''arr'' "warrior"). King Gunnar was a prominent king of medieval literature such as the Middle High German epic poem, the Nibelungenlied, where King Gunnar and Queen Brynhildr hold their court at Worms. Gunder is a nordic variant, Günther is the modern German variant, and Gonario is the Italian version. Some people with the name Gunnar include: Gunnar Andersen *Gunnar Andersen (1890–1968), Norwegian football player and ski jumper *Gunnar Andersen (1909–1988), Norwegian ski jumper *Gunnar Aagaard Andersen (1919–1982), Danish sculptor, painter and designer **Gunnar Reiss-Andersen (1896–1964), Norwegian poet Gunnar Andersson *Johan Gunnar Andersson (1874–1960), Swedish archaeologist, paleontologist and geologist * Gunnar Andersson (1890– ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opponent Process
The opponent process is a color theory that states that the human visual system interprets information about color by processing signals from photoreceptor cells in an antagonistic manner. The opponent-process theory suggests that there are three opponent channels, each comprising an opposing color pair: red versus green, blue versus yellow, and black versus white (luminance). The theory was first proposed in 1892 by the German physiologist Ewald Hering. Color theory Complementary colors When staring at a bright color for awhile (e.g. red), then looking away at a white field, an afterimage is perceived, such that the original color will evoke its complementary color (green, in the case of red input). When complementary colors are combined or mixed, they "cancel each other out" and become neutral (white or gray). That is, complementary colors are never perceived as a mixture; there is no "greenish red" or "yellowish blue", despite claims to the contrary. The strongest color con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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