The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
The spectral sensitivities of single Limulus median ocellus photoreceptors have been determined from records of receptor potentials obtained using intracellular microelectrodes. One class of receptors, called UV cells (ultraviolet cells), depolarizes to near-UV light and is maximally sensitive at 3...
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| Format: | Online |
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The Rockefeller University Press
1969
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2225948/ |
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pubmed-22259482008-04-23 The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus Nolte, John Brown, Joel E. Article The spectral sensitivities of single Limulus median ocellus photoreceptors have been determined from records of receptor potentials obtained using intracellular microelectrodes. One class of receptors, called UV cells (ultraviolet cells), depolarizes to near-UV light and is maximally sensitive at 360 nm; a Dartnall template fits the spectral sensitivity curve. A second class of receptors, called visible cells, depolarizes to visible light; the spectral sensitivity curve is fit by a Dartnall template with λmax at 530 nm. Dark-adapted UV cells are about 2 log units more sensitive than dark-adapted visible cells. UV cells respond with a small hyperpolarization to visible light and the spectral sensitivity curve for this hyperpolarization peaks at 525–550 nm. Visible cells respond with a small hyperpolarization to UV light, and the spectral sensitivity curve for this response peaks at 350–375 nm. Rarely, a double-peaked (360 and 530 nm) spectral sensitivity curve is obtained; two photopigments are involved, as revealed by chromatic adaptation experiments. Thus there may be a small third class of receptor cells containing two photopigments. The Rockefeller University Press 1969-11-01 /pmc/articles/PMC2225948/ /pubmed/5346532 Text en Copyright © 1969 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Nolte, John Brown, Joel E. |
| spellingShingle |
Nolte, John Brown, Joel E. The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus |
| author_facet |
Nolte, John Brown, Joel E. |
| author_sort |
Nolte, John |
| title |
The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
|
| title_short |
The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
|
| title_full |
The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
|
| title_fullStr |
The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
|
| title_full_unstemmed |
The Spectral Sensitivities of Single Cells in the Median Ocellus of Limulus
|
| title_sort |
spectral sensitivities of single cells in the median ocellus of limulus |
| description |
The spectral sensitivities of single Limulus median ocellus photoreceptors have been determined from records of receptor potentials obtained using intracellular microelectrodes. One class of receptors, called UV cells (ultraviolet cells), depolarizes to near-UV light and is maximally sensitive at 360 nm; a Dartnall template fits the spectral sensitivity curve. A second class of receptors, called visible cells, depolarizes to visible light; the spectral sensitivity curve is fit by a Dartnall template with λmax at 530 nm. Dark-adapted UV cells are about 2 log units more sensitive than dark-adapted visible cells. UV cells respond with a small hyperpolarization to visible light and the spectral sensitivity curve for this hyperpolarization peaks at 525–550 nm. Visible cells respond with a small hyperpolarization to UV light, and the spectral sensitivity curve for this response peaks at 350–375 nm. Rarely, a double-peaked (360 and 530 nm) spectral sensitivity curve is obtained; two photopigments are involved, as revealed by chromatic adaptation experiments. Thus there may be a small third class of receptor cells containing two photopigments. |
| publisher |
The Rockefeller University Press |
| publishDate |
1969 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2225948/ |
| _version_ |
1611436900418060288 |