The Response of the Limulus Photoreceptor Cell to the Absorption of Single Photons

1988 ◽  
Vol 92 (9) ◽  
pp. 1017-1020
Author(s):  
Hennig Stieve
Keyword(s):  
Photoreceptor Cell ◽  
Single Photons ◽  
Limulus Photoreceptor

Spontaneous Bumps Of The Limulus Photoreceptor Cell Are Probably Triggered By The Spontaneous Activation Of Single G-Protein Molecules

1992 ◽  
Vol 47 (11-12) ◽  
pp. 932-936 ◽  
Author(s):  
Helmut Reuß ◽  
Michael Rack ◽  
Hennig Stieve
Keyword(s):  
G Protein ◽  
Voltage Clamp ◽  
Photoreceptor Cell ◽  
Limulus Polyphemus ◽  
Limulus Photoreceptor ◽  
Protein Activator ◽  
Protein Molecules ◽  
Time Parameters ◽  
Spontaneous Activation

The elementary responses, the “bumps”, of the ventral photoreceptor of Limulus polyphemus were studied under voltage clamp conditions. We compared spontaneous bumps with those induced by light and we applied the G-protein activator A1F4-. The amplitude of the spontaneous bumps is on the average 7 - 8 times smaller than that of the light-induced bumps. Bumps induced by A1F4- have identical size and time parameters when compared with spontaneous bumps. Thus at least a large part of the spontaneous bumps is probably triggered by the activation of single G-protein molecules. However, if the next step of the transduction chain is gainless, it is also possible the spontaneous bump originate from this step. The different size of spontaneous and light-induced bumps can be explained assuming that a light-activated metarhodopsin molecule leads to the activation of 3 to 12 G-protein molecules

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2021 ◽  
Author(s):  
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Keyword(s):  
Single Photons ◽  
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scholarly journals Stromal Cell-Derived Factor-1 Is Essential for Photoreceptor Cell Protection in Retinal Detachment

2010 ◽  
Vol 177 (5) ◽  
pp. 2268-2277 ◽  
Author(s):  
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Noboru Arimura ◽  
Shozo Sonoda ◽  
Makoto Nakamura ◽  
Teruto Hashiguchi ◽  
...  
Keyword(s):  
Retinal Detachment ◽  
Stromal Cell ◽  
Photoreceptor Cell ◽  
Cell Protection ◽  
Stromal Cell Derived Factor

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Author(s):  
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...  
Keyword(s):  
Machine Learning ◽  
Single Photons ◽  
Spatial Mode
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