scholarly journals SOME PRELIMINARY OBSERVATIONS ON THE EARLY RECEPTOR POTENTIAL OF THE ISOLATED FROG RETINA

1968 ◽  
Vol 18 (5) ◽  
pp. 642-654 ◽  
Author(s):  
Isao HANAWA ◽  
Katsuhiko MATSUMURA ◽  
Tetsuji MATSUURA
Keyword(s):  
Receptor Potential ◽  
Frog Retina ◽  
Early Receptor Potential

Isolation of rod early receptor potential from frog retina

1978 ◽  
Vol 18 (7) ◽  
pp. 861-863 ◽  
Author(s):  
Tadashi Nakamura ◽  
Fumio Tokunaga ◽  
Toˆru Yoshizawa
Keyword(s):  
Receptor Potential ◽  
Frog Retina ◽  
Early Receptor Potential

scholarly journals A NEW PROPERTY OF THE EARLY RECEPTOR POTENTIAL OF THE ISOLATED FROG RETINA

1968 ◽  
Vol 18 (5) ◽  
pp. 655-664
Author(s):  
Isao HANAWA ◽  
Katsuhiko MATSUMURA ◽  
Tetsuji MATSUURA
Keyword(s):  
Receptor Potential ◽  
Frog Retina ◽  
Early Receptor Potential

scholarly journals Electrophysiological measurement of the number of rhodopsin molecules in single Limulus photoreceptors.

1977 ◽  
Vol 70 (5) ◽  
pp. 621-633 ◽  
Author(s):  
J E Lisman ◽  
H Bering
Keyword(s):  
Relative Intensity ◽  
Surface Density ◽  
Receptor Potential ◽  
Absolute Intensity ◽  
Charge Movement ◽  
Half Time ◽  
Quantal Response ◽  
Early Receptor Potential ◽  
Electrophysiological Measurement ◽  
Electrophysiological Methods

Two partly independent electrophysiological methods are described for measuring the number of rhodopsin molecules (R) in single ventral photoreceptors. Method 1 is based on measurements of the relative intensity required to elicit a quantal response and the relative intensity required to half-saturate the early receptor potential (ERP). Method 2 is based on measurements of the absolute intensity required to elicit a quantal response. Both methods give values of R approximately equal to 10(9). From these and other measurements, estimates are derived for the surface density of rhodopsin (8,000/micrometer2), the charge movement during the ERP per isomerized rhodopsin (20 X 10(-21) C), and the half-time for thermal isomerization of rhodopsin (36yr).

scholarly journals Enigma of early receptor potential in fly eyes

1989 ◽  
Vol 29 (12) ◽  
pp. 1663-1670 ◽  
Author(s):  
S. Gagné ◽  
J.G.H Roebroek ◽  
D.G. Stavenga
Keyword(s):  
Receptor Potential ◽  
Early Receptor Potential

Suppression of cone-driven responses by rods in the isolated frog retina

1988 ◽  
Vol 1 (4) ◽  
pp. 331-338 ◽  
Author(s):  
Cun-Jian Dong ◽  
Hao-Hua Qian ◽  
John S. McReynolds ◽  
Xiong-Li Yang ◽  
Yu-Min Liu
Keyword(s):  
Dark Adaptation ◽  
Visual Pigment ◽  
Pigment Epithelium ◽  
Signal Transmission ◽  
Receptor Potential ◽  
Response Sensitivity ◽  
Long Wavelength ◽  
Negligible Amount ◽  
Frog Retina ◽  
Time Courses

AbstractThe sensitivity of rod- and cone-driven responses was studied in the isolated frog retina during the period of rapid dark adaptation following a conditioning flash which bleached a negligible amount of visual pigment. Following a conditioning flash, cone-driven b-wave responses were first enhanced and then depressed. The time courses of the enhancement and subsequent depression of cone-drive responses varies greatly with the intensity and wavelength of the conditioning flash, but were identical when the conditioning' flashes were matched for equal excitation of 502 nm rods. These changes in cone-driven response sensitivity were correlated with the desensitization and recovery of rods following the conditioning flash. When signal transmission from rods to second-order cells was interrupted by the addition of L-glutamate, the conditioning flash did not produce the above-described enhancement and subsequent depression of long-wavelength receptor potential responses. The suppression of cone-driven response therefore appears to be due to a synaptically mediated influence from 502 nm rods which is maximal when the rods are in the dark-adapted state, with little or no contribution from 433 nm rods, and no involvement of the pigment epithelium.

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