Download or read book Rod and Cone Contributions to S potentials from Cat Retina written by Roy Herbert Steinberg and published by . This book was released on 1969 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of whether the rods contribute to S-potentials was studied in the intact eye of the cat. S-potentials from luminosity units (L-units) were evoked by small spots of relatively monochromatic light in dark- and light-adapted retinae. The spectral sensitivity curve for dark-adapted S-potentials had its maximum at 500 nm, and the form of dark-adapted responses also suggested that rods were excited. The spectral sensitivity curve for light-adapted S-potentials had its maximum at 560 nm, and response latencies even at threshold were much faster than in dark adaptation. Individual S-potentials exhibited Purkinje shifts. It is concluded that rhodopsin rods contribute to S-potentials (L-type) in the cat and that cones contribute to the same responses. (Author).

Download or read book Acta Physiologica Scandinavica written by and published by . This book was released on 1959 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current List of Medical Literature written by and published by . This book was released on 1954 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes section, "Recent book acquisitions" (varies: Recent United States publications) formerly published separately by the U.S. Army Medical Library.

Download or read book Reports written by Naval School of Aviation Medicine (U.S.) and published by . This book was released on 1969 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of the Medical Research Council written by Medical Research Council (Great Britain) and published by . This book was released on 1951 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1919/20 includes also the "Report of the Committee of the Privy Council for Medical Research for the year 1919-1920."

Download or read book Photochemistry of Vision written by Herbert J.A. Dartnall and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiation can only affect matter if absorbed by it. Within the broad range of 300-1000 nm, which we call "the visible", light quanta are energetic enough to produce excited electronic states in the atoms and molecules that absorb them. In these states the molecules may have quite different properties from those in their dormant condition, and reactions that would not otherwise occur become possible. About 80 % of the radiant energy emitted by our sun lies in this fertile band, and so long as the sun's surface temperature is maintained at about 6000° C this state of affairs will continue. This and the transparency of our atmosphere and waters have allowed the generation and evolution of life. Before life began the atmosphere probably also transmitted much of the solar short-wave radiation, but with the rise of vegetation a new product - oxygen - appeared and this, by a photochemical reaction in the upper atmosphere, led to the ozone layer that now protects us from the energetic "short-wave" quanta that once, perhaps, took part in the generation of life-molecules. Light is an ideal sensory stimulus. It travels in straight lines at great speed and, consequently, can be made to form an image from which an animal can make "true", continuous and immediate assessments of present and impending events.

Download or read book Ophthalmic Literature written by and published by . This book was released on 1963 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Safety Engineering written by and published by . This book was released on 1923 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Jewelers Circular and Horological Review written by and published by . This book was released on 1898 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Visual Process written by Hugh Davson and published by Academic Press. This book was released on 2014-05-12 with total page 819 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Eye: Volume 2, The Visual Process is a compendium of papers that describes the physiology of the eye, particularly the visual functions, the photobiology of the visual process, and the visual pathway. One paper describes the light stimuli used in physiological experiments concerning vision in terms of their spectral energy distribution, particularly the amounts of light absorbed by the photosensitive substances contained in the retinal receptors. Another paper explains the mosaic-like arrangement of the receptors and the variations of this mosaic in the different regions of the retina, including the Purkinje phenomenon which can cause errors in visual measurements. One paper examines the directional properties of the rods at long wavelengths and the theory of the Stiles-Crawford effect. Other papers investigate the limits of the visible spectrum, the scotopic luminous efficiency, theories of dark-adaptation, as well as the minimum retinal illumination, the minimum flux of energy, and the minimum amount necessary for vision. One paper notes that whereas one rod can be stimulated by one quantum (a discrete process involving one pigment molecule), it is not sufficient to make a human subject see a light stimulus. The compendium is invaluable for researchers and investigators involved in physiology, psychology, ophthalmology, and in all branches of ocular physiology.

Download or read book Physiologic Optics Dioptrics of the Eye Functions of the Retina Ocular Movements and Binocular Vision written by Marius Hans Erik Tscherning and published by . This book was released on 1904 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Awards Index written by and published by . This book was released on 1988 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1972 with total page 1360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physiologic Optics Dioptrics of the Eye Functions of the Retina Ocular Movements and Binocular Vision Authorized Translation from the Original French Ed Specially Rev and Enl written by Marius Hans Erik Tscherning and published by . This book was released on 1904 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Encyclopedia dictionary and Reference Handbook of the Ophthalmic Sciences written by Rollin Henry Knowles and published by . This book was released on 1903 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Medical lexicon written by Robley Dunglison and published by . This book was released on 1866 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Encyclopedia Americana written by Frederick Converse Beach and published by . This book was released on 1903 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: