Reciprocity between light intensity and rhodopsin concentration across the rat retina
If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. Our o...
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| Published in | The Journal of physiology Vol. 516; no. 3; pp. 869 - 874 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Oxford, UK
The Physiological Society
01.05.1999
Blackwell Science Ltd Blackwell Science Inc |
| Subjects | |
| Online Access | Get full text |
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| Abstract | If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels
- is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin
concentration should be high, and vice versa.
Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was
not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation
with the light intensity.
The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. |
|---|---|
| AbstractList | 1. If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. 2. Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation with the light intensity. 3. The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation with the light intensity. The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation with the light intensity. The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. 1 If a purpose of photostasis ‐ absorption of a constant number of photons by the retina, regardless of incident light levels ‐ is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. 2 Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation with the light intensity. 3 The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. * 1 If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation during the light period, then in retinal regions where light intensity is low, rhodopsin concentration should be high, and vice versa. * 2 Our ocular transmission photometric measurements revealed that the distribution of light intensity across the rat retina was not as simple as had been thought and, furthermore, that the local concentration of rhodopsin had a high negative correlation with the light intensity. * 3 The reciprocity between these two parameters leads to nearly uniform rates of photon absorption in rods across the retina. |
| Author | T P Williams A Squitieri R P Henderson J P P Webbers |
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| References | 1963; 46 1979; 19 1998a; 39 1955; 130 1986; 73 1998b; 508 1986; 43 1991; 53 1991; 97 1995; 34 1995b; 61 1998 1932; 13 1962 1980 1954; 1 1995a; 61 e_1_2_5_14_1 e_1_2_5_17_1 e_1_2_5_9_1 Williams T. P. (e_1_2_5_15_1) 1998; 39 e_1_2_5_16_1 e_1_2_5_8_1 e_1_2_5_11_1 e_1_2_5_7_1 e_1_2_5_13_1 e_1_2_5_5_1 e_1_2_5_12_1 e_1_2_5_4_1 e_1_2_5_3_1 Pirenne M. H. (e_1_2_5_10_1) 1962 e_1_2_5_2_1 e_1_2_5_1_1 e_1_2_5_18_1 Kooijman A. C. (e_1_2_5_6_1) 1986; 73 |
| References_xml | – start-page: 159 year: 1962 end-page: 174 – volume: 43 start-page: 915 year: 1986 end-page: 928 article-title: Photostasis: regulation of daily photon‐catch by rat retinas in response to various cyclic illuminances publication-title: Experimental Eye Research – volume: 1 start-page: 59 year: 1954 end-page: 65 article-title: Saturation of the rod mechanism of the retina at high levels of stimulation publication-title: Optica Acta – volume: 61 start-page: 25 year: 1995b end-page: 32 article-title: Rod outer segment renewal as a mechanism for adaptation to a new intensity environment. II. Rhodopsin synthesis and packing density publication-title: Experimental Eye Research – volume: 34 start-page: 5720 year: 1995 end-page: 5724 article-title: Photometer for measuring intensity and rhodopsin distributions in intact eyes publication-title: Applied Optics – volume: 130 start-page: 131 year: 1955 end-page: 147 article-title: Measurement of the scotopic pigment in the living human eye publication-title: The Journal of Physiology – volume: 73 start-page: 57 year: 1986 end-page: 64 article-title: Light distribution on the retina of a wide‐angle theoretical eye publication-title: Journal of the Optical Society of America – volume: 53 start-page: 781 year: 1991 end-page: 786 article-title: Levels of mRNA encoding proteins of the cGMP cascade as a function of light environment publication-title: Experimental Eye Research – volume: 61 start-page: 17 year: 1995a end-page: 24 article-title: Rod outer segment renewal as a mechanism for adaptation to a new intensity environment. I. Rhodopsin levels and ROS length publication-title: Experimental Eye Research – volume: 508 start-page: 515 year: 1998b end-page: 522 article-title: Distribution of photon absorption rates across the rat retina publication-title: The Journal of Physiology – volume: 13 start-page: 173 year: 1932 end-page: 200 article-title: The mechanism of vision. V. The structure and image‐forming power of the rat's eye publication-title: Journal of Comparative Psychology – start-page: 17 year: 1998 end-page: 32 – start-page: 135 year: 1980 end-page: 159 – volume: 46 start-page: 1267 year: 1963 end-page: 1286 article-title: Quantum relations of the rat electroretinogram publication-title: Journal of General Physiology – volume: 97 start-page: 413 year: 1991 end-page: 435 article-title: Light adaptation in retinal rods of the rabbit and two other non‐primate mammals publication-title: Journal of General Physiology – volume: 39 start-page: 603 year: 1998a end-page: 609 article-title: Effect of eye closures and openings on photostasis in albino rats publication-title: Investigative Ophthalmology and Visual Science – volume: 19 start-page: 569 year: 1979 end-page: 588 article-title: A schematic eye for the rat publication-title: Vision Research – year: 1998 – ident: e_1_2_5_7_1 doi: 10.1037/h0074901 – ident: e_1_2_5_11_1 doi: 10.1007/978-1-4684-7257-8_6 – ident: e_1_2_5_14_1 doi: 10.1007/978-1-4899-1549-8_2 – ident: e_1_2_5_3_1 doi: 10.1085/jgp.46.6.1267 – ident: e_1_2_5_4_1 doi: 10.1016/0014-4835(91)90114-T – ident: e_1_2_5_2_1 doi: 10.1113/jphysiol.1955.sp005399 – ident: e_1_2_5_17_1 doi: 10.1364/AO.34.005720 – ident: e_1_2_5_12_1 doi: 10.1016/S0014-4835(95)80054-9 – volume: 39 start-page: 603 year: 1998 ident: e_1_2_5_15_1 article-title: Effect of eye closures and openings on photostasis in albino rats publication-title: Investigative Ophthalmology and Visual Science contributor: fullname: Williams T. P. – ident: e_1_2_5_5_1 doi: 10.1016/0042-6989(79)90143-3 – ident: e_1_2_5_9_1 doi: 10.1016/0014-4835(86)90070-9 – ident: e_1_2_5_18_1 doi: 10.1111/j.1469-7793.1998.515bq.x – ident: e_1_2_5_16_1 doi: 10.1007/978-1-4899-1549-8_2 – volume: 73 start-page: 57 year: 1986 ident: e_1_2_5_6_1 article-title: Light distribution on the retina of a wide‐angle theoretical eye publication-title: Journal of the Optical Society of America contributor: fullname: Kooijman A. C. – ident: e_1_2_5_8_1 doi: 10.1085/jgp.97.3.413 – ident: e_1_2_5_1_1 doi: 10.1080/713818657 – start-page: 159 volume-title: The Eye year: 1962 ident: e_1_2_5_10_1 contributor: fullname: Pirenne M. H. – ident: e_1_2_5_13_1 doi: 10.1016/S0014-4835(95)80055-7 |
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- is to maintain rods at saturation... 1 If a purpose of photostasis ‐ absorption of a constant number of photons by the retina, regardless of incident light levels ‐ is to maintain rods at... 1. If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at... * 1 If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at... If a purpose of photostasis - absorption of a constant number of photons by the retina, regardless of incident light levels - is to maintain rods at saturation... |
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| SubjectTerms | Animals Female In Vitro Techniques Light Male Original Photometry Rats Rats, Sprague-Dawley Retina - metabolism Retina - radiation effects Retinal Rod Photoreceptor Cells - physiology Retinal Rod Photoreceptor Cells - radiation effects Rhodopsin - metabolism Rhodopsin - radiation effects |
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| Title | Reciprocity between light intensity and rhodopsin concentration across the rat retina |
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