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  Fast electrical potentials arising from activation of metarhodopsin in the fly

Minke, B., & Kirschfeld, K. (1980). Fast electrical potentials arising from activation of metarhodopsin in the fly. Journal of General Physiology, 75(4), 381-402. doi:10.1085/jgp.75.4.381.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-F10C-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-0B07-7
Genre: Journal Article

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 Creators:
Minke, B1, 2, Author              
Kirschfeld, K1, 2, Author              
Affiliations:
1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: The cellular origin and properties of fast electrical potentials arising from activation of Calliphora photopigment were investigated. It was found by intracellular recordings that only the corneal-negative M1 phase of fly M potential arises in the photoreceptors' membrane. This M1 phase has all the accepted characteristics of an early receptor potential (ERP). It has no detectable latency, it survives fixation with glutaraldehyde, it is linear with light intensity below pigment saturation, and it is linear with the amount of metarhodopsin activated by light. The Calliphora ERP was found, however, to be exceptional because activation of rhodopsin, which causes the formation of metarhodopsin in 125 microsecond (25 degrees C), was not manifested in the ERP. Also, the extracellularly recorded ERP was not proportional to the rate of photopigment conversion. The corneal-positive M2 phase of the M potential was found to arise from second-order lamina neurons (L neurons). Intracellular recordings from these cells showed a fast hyperpolarizing potential, which preceded the normal hyperpolarizing transient of these cells. This fast potential appeared only when metarhodopsin was activated by a strong flash. The data indicate that the intracellularly recorded positive ERP, which arises from activation of metarhodoposin, elicits a hyperpolarizing fast potential in the second-order neuron. This potential is most likely the source of the corneal-positive M potential.

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 Dates: 1980-04
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: BibTex Citekey: 3736
DOI: 10.1085/jgp.75.4.381
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Title: Journal of General Physiology
  Other : J. Gen. Physiol.
  Abbreviation : JGP
Source Genre: Journal
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Publ. Info: Rockefeller University Press
Pages: - Volume / Issue: 75 (4) Sequence Number: - Start / End Page: 381 - 402 Identifier: ISSN: 0022-1295
CoNE: https://pure.mpg.de/cone/journals/resource/954925413895