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Spectral absorbance changes in the photoreceptors of the juvenile masked greenling, Hexagrammos octogrammus (Pisces, Hexagrammidae).
J Fish Biol
November 2024
Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia.
When changing habitat during migration or ontogenesis, fish encounter changes of the visual environment, among which the most important is the spectral composition of light and turbidity. This leads to changes in the behavior, morphology, and physiology of the visual system, in particular, spectral sensitivity, which is determined by the properties of visual pigments. The masked greenling Hexagrammos octogrammus has an additional factor that shapes effective spectral sensitivity-the presence of densely bright orange cornea which reversibly changes its density depending on the state of light/dark adaptation.
View Article and Find Full Text PDFUltrasound-assisted dispersive micro solid phase extraction of maneb in water and food samples with new hybrid block copolymer material prior to micro-spectrophotometric analysis.
Food Chem
January 2025
Tokat Gaziosmanpasa University, Science and Arts Faculty, Chemistry Department, 60250 Tokat, Turkey. Electronic address:
A simple and effective ultrasound-assisted dispersive micro solid-phase extraction (UA-dμSPE) method was developed for the spectrophotometric determination of traces maneb in food and water. In this study, a new hybrid block copolymer poly (vinyl benzyl chloride-b-dimethyl aminoethyl methacrylate) (Pvb-DMA) was synthesized and characterized using techniques such as FTIR, SEM-EDX. The synthesized Pvb-DMA was used as an adsorbent for the extraction of maneb for first time in this study.
View Article and Find Full Text PDFCan the Dynamic Colouration and Patterning of Bluelined Goatfish (Mullidae; Upeneichthys lineatus) Be Perceived by Conspecifics?
Brain Behav Evol
April 2022
Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia.
Bluelined goatfish (Upeneichthys lineatus) exhibit dynamic body colour changes and transform rapidly from a pale, buff/white, horizontally banded pattern to a conspicuous, vertically striped, red pattern when foraging. This red pattern is potentially an important foraging signal for communication with conspecifics, provided that U. lineatus can detect and discriminate the pattern.
View Article and Find Full Text PDFUnusual A1/A2-visual pigment conversion during light/dark adaptation in marine fish.
Comp Biochem Physiol A Mol Integr Physiol
December 2019
Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia; Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok 152742, Russia.
Changes in visual pigments were studied in two marine fish species, the masked greenling Hexagrammos octogrammus and the prickleback Pholidapus dybowskii. A microspectrophotometric (MSP) analysis showed that the rods and cones of the fish collected from the natural marine environment in summer or kept in a tank at a high illumination level predominantly contained porphyropsins based on chromophore A2. As a result, λ of the double cones significantly shifted to longer wavelengths, reaching 625 and 609 nm, respectively.
View Article and Find Full Text PDFSpectral sensitivity and photoresponse in the rock bream Oplegnathus fasciatus and their relationships with the absorption maximum of the photoreceptor.
Fish Physiol Biochem
October 2019
Department of Fisheries Biology, Pukyong National University, Busan, 48513, South Korea.
The spectral characteristics of visual pigments are a major determinant in eliciting a response to light. To study the absorption maximum of the photoreceptors and their sensitivity to light in fish, rod outer segments (ROS) and cone cells were purified from the rock bream Oplegnathus fasciatus adapted to the dark. Ultraviolet/visible spectroscopic analyses of the ROS in the dark and its difference spectra indicated an absorption maximum of the visual pigment at ~ 500 nm, and each eye of 1-year-old rock bream contained at least 1.
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