Different ionic conductances are modulated during the late receptor potential and the prolonged depolarizing afterpotential in Hermissenda type A photoreceptors

1993 ◽  
Vol 172 (1) ◽  
pp. 47-55
Author(s):  
H.-P. H�pp ◽  
D.L. Alkon
Keyword(s):  
Receptor Potential ◽  
Type A ◽  
Ionic Conductances ◽  
Late Receptor Potential ◽  
Prolonged Depolarizing Afterpotential

scholarly journals Lability of the prolonged depolarizing afterpotential in Balanus photoreceptors.

1977 ◽  
Vol 70 (4) ◽  
pp. 441-452 ◽  
Author(s):  
R C Lantz ◽  
F Wong ◽  
A Mauro
Keyword(s):  
Decay Time ◽  
Receptor Potential ◽  
Large Cell ◽  
Long Duration ◽  
Early Receptor Potential ◽  
Late Receptor Potential ◽  
Tightly Coupled ◽  
Normal Light ◽  
The Stability ◽  
Prolonged Depolarizing Afterpotential

A large cell to cell variability of the prolonged depolarizing afterpotential (PDA) decay time constant (tau) has been measured in Balanus eberneus lateral ocelli. While 25% of the cells had PDA's of long duration, tau greater than 10 min. 45% of the cells tested showed either weak (tau less than 60 s) PDA or none at all. The variability was not reflected in the late receptor potential. All the cells showed normal light-coincident responses. The variability was not due to some alteration of the thermal stability of the pigment states, since after monochromatic adaptation the amplitude of the early receptor potential remained unchanged for at least 30 min. In addition, in some cells that initially showed PDAs of long duration, the decay time was either shortened or abolished after exposure to anoxia. Again, the late receptor potential and the stability of the pigments remained unaffected. These results indicate that the mechanisms which give rise to the PDA are not always tightly coupled to the direct chain of events that lead to the light-coincident response.

scholarly journals Rapid Dark Recovery of the Invertebrate Early Receptor Potential

1973 ◽  
Vol 62 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Peter Hillman ◽  
F. A. Dodge ◽  
S. Hochstein ◽  
B. W. Knight ◽  
B. Minke
Keyword(s):  
Intracellular Recording ◽  
Dark Adaptation ◽  
Receptor Potential ◽  
Visual Pigments ◽  
The State ◽  
Total Recovery ◽  
Time Constants ◽  
Early Receptor Potential ◽  
Late Receptor Potential

The recovery in the dark of the early receptor potential, as a direct manifestation of the state of the visual pigments, has been studied by intracellular recording in the ventral photoreceptors of Limulus and lateral photoreceptors of Balanus. The recovery is exponential with 1/e time constants of about 80 ms at 24°C for both preparations and 1800 ms at 4°C for Balanus. The 24°C rate extrapolates to total recovery of the pigment within 2 s. The later part of the dark adaptation of the late receptor potential, which may take from seconds to minutes in these preparations, appears thus to be unrelated to the state of the pigment.

Responses of Barnacle Photoreceptors to High Energy Flashes of Short Duration

1978 ◽  
Vol 33 (7-8) ◽  
pp. 600-604
Author(s):  
Christof C. Krischer ◽  
R. D. Dahl ◽  
M. Körfer
Keyword(s):  
Kinetic Model ◽  
Short Duration ◽  
Receptor Potential ◽  
High Energy ◽  
Ringer Solution ◽  
Time Span ◽  
Stable States ◽  
Early Receptor Potential ◽  
Late Receptor Potential ◽  
Light Flashes

Abstract In chromatic adapted barnacle median and lateral photo­receptors the two stable states of the photopigment (rhodopsin R and metarhodopsin M) were interconverted with intense, colored light flashes of 1 ms duration. Only after conversion of the red adapted photoreceptor in K+-Ringer solution with an intense flash the negative early receptor potential, ERP (of R) gradually appeared detected with an indicator flash. For the opposite conversion (blue adapted, R→M) the gradual appearence of the positive ERP (M) was not measurable in the same time span. In artificial seawater all flash stimuli yielded - irrespective of color - the transient component of the late receptor potential (LRP). ERP results for the lateral photoreceptor are dis­cussed in view of an existing kinetic model and an attempt is made to give an explanation which covers the new LRP transient and ERP results for both types of photoreceptor (appendix).

The generation of the late receptor potential: An excitation-inhibition phenomenon

1972 ◽  
Vol 12 (9) ◽  
pp. 1519-1531 ◽  
Author(s):  
Arnold J. Sillman ◽  
W. Geoffrey Owen ◽  
Hector R. Fernandez
Keyword(s):  
Receptor Potential ◽  
Late Receptor Potential
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