Vertebrate Photoreceptor Optics
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Vertebrate Photoreceptor Optics
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Author : Jay M. Enoch
language : en
Publisher: Springer Verlag
Release Date : 1981
Vertebrate Photoreceptor Optics written by Jay M. Enoch and has been published by Springer Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
Vertebrate Photoreceptor Optics
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Author : J.M. Enoch
language : en
Publisher: Springer
Release Date : 2014-04-18
Vertebrate Photoreceptor Optics written by J.M. Enoch and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-18 with Technology & Engineering categories.
It is in the receptors of the vertebrate retina that the characteristic visual process - the transduction of radiational energy into physiological activtty of a different kind - takes place. The way these receptors modify or redistribute the incident radiation and thereby control the light ab sorption by the visual pigments they contain, is the central theme of this book. As far back as 1843 Brucke put forward a well-reasoned model for the optics of a receptor, assuming simple ray optics, and it is already some forty-seven years since the dependence of receptor sensitivity on retinal angle of incidence was established experimentally as an important factor in human vision and as one by which the direction of alignment of receptors in the living eye might be determined. But it is to Professor J. M. Enoch, editor and author of several major contributions to this volume, that we owe the first experimental demonstration (in 1961) of the wave-mode propa gation of light in vertebrate visual receptors, as well as the results of some thirty years devoted research concerned with all questions of receptor optics, particularly directional sensitivity and receptor alignment, both for normal vertebrate eyes and for pathologically modified eyes. His work on the latter has opened up a whole range of clinical possibilities.
Photoreceptor Optics
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Author : A.W. Snyder
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Photoreceptor Optics written by A.W. Snyder and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The above consideration indicates that at present many of the experi mental facts on PS in animals can be quantitatively explained within the limits of the "universal" photoreceptor membrane concept. Of course, existence of preferential orientation of the absorbing dipoles in the tubuli of the rhabdomeres can not be totally rejected. We hope that the concept of the "universal" photoreceptor membrane may serve as the useful instrument when dealing with newly discovered properties of visual cells so that true mechanisms of electrical and optical coupling will be searched for instead of assumptions being made on additional properties of the photoreceptor membrane in every new animal under study. 5. Absorption Spectrum of the Universal Photoreceptor Membrane and Spectral Sensitivity of the Photoreceptor 5. 1 Preliminary Notes It seems nearly self-evident that the absorption spectrum of the pho toreceptor membrane coincides exactly with that of the visual pigment it contains. Hence, the membrane must exhibit three bands of absorp tion - the principal band with its peak within the limits of visible spectrum (or a-peak); the secondary band between 340 and 380 nm (S peak); and the third, protein band, in the ultraviolet (UV) at 280 nm (COLLINS et al. , 1952). The main peak of absorption is located within the range 433-575 nm for retinol-based pigments and between 438 and 620 nm for 3-dehydroretinol-based pigments, the position of Amax de pending on many ecological factors.
Invertebrate Photoreceptors
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Author : Jerome J. Wolken
language : en
Publisher: Academic Press
Release Date : 2013-10-22
Invertebrate Photoreceptors written by Jerome J. Wolken and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
Invertebrate Photoreceptors: A Comparative Analysis covers the structure and pigment chemistry of invertebrate photoreceptors. The book discusses the photobehavior and photoreceptor systems of invertebrate animals; the protozoan photoreceptor; and the compound eye. The text also describes the crustacean and mollusc eyes; the vertebrate retinal photoreceptors; and the invertebrate eye and its visual pigments. The book concludes with discussions on primitive photoreceptors; spectral sensitivity, pigments, and color vision; and polarized light analysis. Biologists and people involved in the study of invertebrate photobiology will find the text invaluable.
Physiology Of Photoreceptor Organs
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Author : Michelangelo G.F. Fuortes
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Physiology Of Photoreceptor Organs written by Michelangelo G.F. Fuortes and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Medical categories.
This volume is a collection of essays which attempts to summarize the recent progress in the field of photoreceptor and retinal physiology. Reflecting the way in which research is organized, each author reports on the studies performed with the techniques with which he is most familiar: morpholo gical, chemical or physiological. The first chapters describe the structure of visual cells and the histological architecture of the retina. Next comes a summary of the laws governing photochemical reactions and a report on the biochemistry of photopigments. Four articles cover the optical properties of invertebrate eyes and the electrophysiology and the interactions of their photoreceptors. These are followed by a discussion of the properties of vertebrate eyes, including chapters on optics, on the electrical responses of rods and cones and on the functional organization of the retina. The final chapter provides an extensive review of retinal biochemistry and metabolism. Even though the experimental approach differs, all studies are directed toward the solution of two basic problems: transduction in the photoreceptors and orga nization (often called "information processing") in the retina. The central problem of photoreceptor cells is to determine how light produces a response. We know that illumination evokes electrical changes and we have recently learned a great deal about the features of these changes. The evidence indicates however that elaborate processes must be interposed between the ab sorption of photons by the pigment and the production of electric currents through the membrane. These intermediary cvents remain to be unraveled.
Vertebrate Photoreceptors
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Author : Samuel Randall Detwiler
language : en
Publisher:
Release Date : 1943
Vertebrate Photoreceptors written by Samuel Randall Detwiler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1943 with Photoreceptors categories.
Events leading up to a night of terror at a high school dance are told from the point of view of various people involved.
Vertebrate Phototransduction And The Visual Cycle
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Author : Krzysztof Palczewski
language : en
Publisher: Academic Press
Release Date : 2000
Vertebrate Phototransduction And The Visual Cycle written by Krzysztof Palczewski and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Cellular signal transduction categories.
Vertebrate Photoreceptor Optics
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Author : J.M. Enoch
language : en
Publisher: Springer
Release Date : 1981-09
Vertebrate Photoreceptor Optics written by J.M. Enoch and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-09 with Medical categories.
With contributions by numerous experts
Physiology Of Photoreceptor Organs
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Author : Michelangelo G. F. Fuortes
language : en
Publisher:
Release Date : 1972-12-11
Physiology Of Photoreceptor Organs written by Michelangelo G. F. Fuortes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972-12-11 with categories.
The Visual System In Vertebrates
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Author : F. Crescitelli
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-12-11
The Visual System In Vertebrates written by F. Crescitelli and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-11 with Medical categories.
The vertebrate eye has been, and continues to be, an object of interest and of inquiry for biologists, physicists, chemists, psychologists, and others. Quite apart from its important role in the development of ophthalmology and related medical disciplines, the vertebrate eye is an exemplar of the ingenuity of living systems in adapting to the diverse and changing environments in which vertebrates have evolved. The wonder is not so much that the visual system, like other body systems, has been able to adapt in this way, but rather that these adaptations have taken such a variety of forms. In a previous volume in this series (VII/I) Eakin expressed admiration for the diversity of invertebrate photoreceptors. A comparable situation exists for the vertebrate eye as a whole and one object of this volume is to present to the reader the nature of this diversity. One result of this diversification of ocular structures and properties is that the experimental biologist has available a number of systems for study that are unique or especially favorable for the investigation of particular questions in visual science or neurobiology. This volume includes some examples of progress made by the use of such specially selected vertebrate systems. It is our hope that this comparative approach will continue to reveal new and useful preparations for the examination of important questions.
