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Author: Harold E. Henkes
Publisher: Springer Science & Business Media
ISBN: 9400906412
Category : Medical
Languages : en
Pages : 151
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Book Description
When the eyeball is indented in total darkness, within less than 200 mil liseconds an oval or quarter-moon shaped spot of light is perceived in the part of the visual field corresponding to the indented region of the retina. In the seconds following, this phosphene extends across the whole visual field and alters in structure during further eyeball indentation. It is then seen as irregular large bright spots of light, finely structured moving light grains ('light nebula') and stationary bright stars. Regular geometrical patterns appear only when both eyes are indented simultaneously [1]. When the eyeball deformation is released, part of the retina again lights up for another one or two seconds and curved light lines are seen following the course of the larger retinal vessels (Fig. 1). In the following we will review the history of this phenomenon, which played an important role during the first 2200 years of vision theories and in the development of models to explain normal vision. 2. Pre-Socratic philosophers, Plato and Aristotle Alcmaeon of Croton (6-5th century B. C. ), who was a member of the Pythagoraean sect and one of the founders of Greek medicine, was the first to describe mechanical deformation of the eyeball leading to light sensa tions. According to Aristotle's pupil Theophrast of Eresos, Alcmaeon report ed that 'the eye obviously has fire within,for when the eye is struckfireflashes out' [2, p. 88].
Author: Harold E. Henkes
Publisher: Springer Science & Business Media
ISBN: 9400906412
Category : Medical
Languages : en
Pages : 151
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Book Description
When the eyeball is indented in total darkness, within less than 200 mil liseconds an oval or quarter-moon shaped spot of light is perceived in the part of the visual field corresponding to the indented region of the retina. In the seconds following, this phosphene extends across the whole visual field and alters in structure during further eyeball indentation. It is then seen as irregular large bright spots of light, finely structured moving light grains ('light nebula') and stationary bright stars. Regular geometrical patterns appear only when both eyes are indented simultaneously [1]. When the eyeball deformation is released, part of the retina again lights up for another one or two seconds and curved light lines are seen following the course of the larger retinal vessels (Fig. 1). In the following we will review the history of this phenomenon, which played an important role during the first 2200 years of vision theories and in the development of models to explain normal vision. 2. Pre-Socratic philosophers, Plato and Aristotle Alcmaeon of Croton (6-5th century B. C. ), who was a member of the Pythagoraean sect and one of the founders of Greek medicine, was the first to describe mechanical deformation of the eyeball leading to light sensa tions. According to Aristotle's pupil Theophrast of Eresos, Alcmaeon report ed that 'the eye obviously has fire within,for when the eye is struckfireflashes out' [2, p. 88].
Author:
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2658
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Book Description
Author: United States. Surgeon General's Advisory Committee on Smoking and Health
Publisher:
ISBN:
Category : Smoking
Languages : en
Pages : 406
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Book Description
Author: R.R. Bowker Company
Publisher: R. R. Bowker
ISBN:
Category : Reference
Languages : en
Pages : 1436
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Book Description
Author: Jonathan Sterne
Publisher: Duke University Press
ISBN: 9780822330134
Category : Business & Economics
Languages : en
Pages : 478
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Book Description
Table of contents
Author: Huifang Chen
Publisher:
ISBN: 9781536127737
Category : Surgery, Experimental
Languages : en
Pages : 0
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Book Description
Experimental surgery is an important link for the development in clinical surgery, research and teaching. Experimental surgery was part of the most important surgical discoveries in the past century. Since 1901 nine Nobel Prizes have been awarded to the pioneers had remarkable achievements in the basic or practical surgery. In recent 20 years, experimental surgery has achieved new advances, like laparoscopic and robotic surgery, tissue engineering, and gene therapy which are widely applied in clinic surgery. The present book covers wide experimental surgery in preclinical research models subdivided in two volumes. Volume I introduces surgical basic notions, techniques, and different surgical models involved in basic experimental surgery and review the biomechanical models, ischemia/reperfusion injury models, repair and regeneration models, and organ and tissue transplantation models, respectively. Volume II introduces several specific experimental models such as laparoscopic and bariatric experimental surgical models. The second volume also introduces graft-versus-host disease, and other experimental models. Review the advances and development of recent techniques such as tissue engineering, organ preservation, wound healing and scarring, gene therapy and robotic surgery. The book documents the enormous volume of knowledge we have acquired in the field of experimental surgery. In this book, we have invited experts from the United States, Canada, France, Germany, China, Japan, Korea, UK, Sweden, Netherland, Hungary and Turkey to contribute 36 chapters in the fields of their expertise. These two volumes are the compilation of basic experimental surgery and updated advances of new development in this field that will be invaluable to surgeons, residents, graduate students, surgical researchers, physicians, immunologists, veterinarians and nurses in surgery.
Author: Edward Shorter
Publisher: Oxford University Press
ISBN: 0190881208
Category : Medical
Languages : en
Pages : 225
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Book Description
What are the real disease entities in psychiatry? This is a question that has bedeviled the study of the mind for more than a century yet it is low on the research agenda of psychiatry. Basic science issues such as neuroimaging, neurochemistry, and genetics carry the day instead. There is nothing wrong with basic science research, but before studying the role of brain circuits or cerebral chemistry, shouldn't we be able to specify how the various diseases present clinically? Catatonia is a human behavioral syndrome that for almost a century was buried in the poorly designated psychiatric concept of schizophrenia. Its symptoms are well-know, and some of them are serious. Catatonic patients may die as their temperatures accelerate; they become dehydrated because they refuse to drink; they risk inanition because they refuse to eat or move. Autistic children with catatonia may hit themselves repeatedly in the head. We don't really know what catatonia is, in the sense that we know what pneumonia is. But we can identify it, and it is eminently treatable. Clinicians can make these patients better on a reliable basis. There are few other disease entities in psychiatry of which this is true. So why has there been so little psychiatric interest in catatonia? Why is it simply not on the radar of most clinicians? Catatonia actually occurs in a number of other medical illnesses as well, but it is certainly not on the radar of most internists or emergency physicians. In The Madness of Fear, Drs. Shorter and Fink seek to understand why this "vast field of ignorance" exists. In the history of catatonia, they see a remarkable story about how medicine flounders, and then seems to find its way. And it may help doctors, and the public, to recognize catatonia as one of the core illnesses in psychiatry.
Author: Walter Nugent
Publisher: Oxford University Press
ISBN: 0199746559
Category : History
Languages : en
Pages : 161
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Book Description
After decades of conservative dominance, the election of Barack Obama may signal the beginning of a new progressive era. But what exactly is progressivism? What role has it played in the political, social, and economic history of America? This very timely Very Short Introduction offers an engaging overview of progressivism in America--its origins, guiding principles, major leaders and major accomplishments. A many-sided reform movement that lasted from the late 1890s until the early 1920s, progressivism emerged as a response to the excesses of the Gilded Age, an era that plunged working Americans into poverty while a new class of ostentatious millionaires built huge mansions and flaunted their wealth. As capitalism ran unchecked and more and more economic power was concentrated in fewer and fewer hands, a sense of social crisis was pervasive. Progressive national leaders like William Jennings Bryan, Theodore Roosevelt, Robert M. La Follette, and Woodrow Wilson, as well as muckraking journalists like Lincoln Steffens and Ida Tarbell, and social workers like Jane Addams and Lillian Wald answered the growing call for change. They fought for worker's compensation, child labor laws, minimum wage and maximum hours legislation; they enacted anti-trust laws, improved living conditions in urban slums, instituted the graduated income tax, won women the right to vote, and laid the groundwork for Roosevelt's New Deal. Nugent shows that the progressives--with the glaring exception of race relations--shared a common conviction that society should be fair to all its members and that governments had a responsibility to see that fairness prevailed. Offering a succinct history of the broad reform movement that upset a stagnant conservative orthodoxy, this Very Short Introduction reveals many parallels, even lessons, highly appropriate to our own time. About the Series: Combining authority with wit, accessibility, and style, Very Short Introductions offer an introduction to some of life's most interesting topics. Written by experts for the newcomer, they demonstrate the finest contemporary thinking about the central problems and issues in hundreds of key topics, from philosophy to Freud, quantum theory to Islam.
Author: Julia Simner
Publisher: Oxford University Press, USA
ISBN: 0199603324
Category : Art
Languages : en
Pages : 1104
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Book Description
Synesthesia is a fascinating phenomenon which has captured the imagination of scientists and artists alike. This title brings together a broad body of knowledge about this condition into one definitive state-of-the-art handbook.
Author: Cristóbal Rovira Kaltwasser
Publisher: Oxford University Press
ISBN: 0198803567
Category : Political Science
Languages : en
Pages : 737
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Book Description
The Oxford Handbook of Populism presents the state of the art of research on populism from the perspective of Political Science. The book features work from the leading experts in the field, and synthesizes the main strands of research in four compact sections: concepts, issues, regions, and normative debates. Due to its breath, The Oxford Handbook of Populism is an invaluable resource for those interested in the study of populism, but also forexperts in each of the topics discussed, who will benefit from accounts of current discussions and research gaps, as well as a map of new directions in the study of populism.
