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Symmetry 2018, 10(9), 389; https://doi.org/10.3390/sym10090389

Asymmetric Firing Rate from Crayfish Left and Right Caudal Photoreceptors Due to Blue and Green Monochromatic Light Pulses

1
Facultad de Ciencias, Universidad Autónoma del Estado de México, Toluca 50200, México
2
Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
3
Universidad De La Salle Bajío, León 37238, México
*
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 28 August 2018 / Accepted: 31 August 2018 / Published: 8 September 2018
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Abstract

Recent studies have postulated that the left and right caudal photoreceptors (CPR-L and CPR-R, respectively) of the crayfish show asymmetry of spontaneous activity in darkness and responses induced by white light. Two photopigments have been identified; the first one sensitive to blue light and the second one sensitive to green light. This study explores blue and green monochromatic light responsiveness with respect to both CPR-L and -R, as well as the effects of temperature on these photoreceptors. We performed simultaneous extracellular recordings of the firing rate of action potentials from CPRs of the crayfish Cherax quadricarinatus (n = 12). At room temperature (24 ± 1 °C), CPR-L and -R showed a significant difference in the spikes from most of the comparations. CPRs in the dark exhibited spontaneous asymmetric activity and displayed sensitivity to both monochromatic light sources. CPR responses were light intensity dependent within a range of 1.4 logarithmic intensity units, showing approximately 0.5 logarithmic intensity units more sensitivity to blue than to green light. The CPRs displayed an asymmetrical response to both colors by using a constant light intensity. At 14 (±1) °C, activity in darkness diminished while asymmetry persisted, and the CPRs improved responses for both monochromatic light sources, displaying a significant asymmetry. Here, we provide additional evidence of the asymmetric activity in darkness and light response from the CPRs. The new data allow further investigations regarding the physiological role of caudal photoreceptors in the crayfish. View Full-Text
Keywords: crustaceans decapods; Cherax quadricarinatus; non-visual photoreceptors; opsins proteins; extracellular spikes crustaceans decapods; Cherax quadricarinatus; non-visual photoreceptors; opsins proteins; extracellular spikes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Sánchez-Hernández, J.C.; Pacheco-Ortiz, J.A.; Rodríguez-Sosa, L.; Calderón-Rosete, G.; Villagran-Vargas, E. Asymmetric Firing Rate from Crayfish Left and Right Caudal Photoreceptors Due to Blue and Green Monochromatic Light Pulses. Symmetry 2018, 10, 389.

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