Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"visual pigments"”.
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Cone visual pigments - Functional expression and genetic amalysis
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Rhodopsins as light-detectors: Of visual pigments and human beings
… maxima of bovine and octopus artificial pigments, formed by regenerating opsins with the dihydro series of chromophores, support a color regulation model in which the chromophore-binding site of the protein has two negative charges: one directly hydrogen bonded to the Schiff base nitrogen …
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Theoretical and experimental studies on the structure of vertebrate visual pigments
High resolution three dimensional structure of visual pigments is essential for understanding the visual process. The past few years have been an exciting period in the field of the structure of visual pigments. One of the significant achievements is the 9A projection map of bovine rhodopsin. …
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Evolution and functional specializations in nocturnal environments: insights from visual pigments in Chiroptera
… level, vision is initiated through activation of visual pigments, light-sensitive complexes expressed in photoreceptor cells in the retina that have been shown to evolve in response to changes in ecology and light environment. In this thesis, I employ molecular evolutionary analyses and …
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Molecular Evolution and Functional Characterization of the Visual Pigment Proteins of the Great Bowerbird (Chlamydera nuchalis) and Other Vertebrates
Visual pigments are light sensitive receptors in the eye that form the basis of sensory visual transduction. This thesis presents three studies that explore visual pigment proteins in vertebrates using a number of computational and experimental methods in an evolutionary framework. The objective is …
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Visual Opsin Diversity in Anurans
… anurans are understudied with regards to their visual systems and how they function. This study sampled North American anurans representing diverse evolutionary and life histories and which likely possess visual systems adapted to meet different ecological needs. Using standard molecular …
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Color vision: Studies on gecko cone visual pigment
Cone visual pigments are responsible for color vision. Although a large amount is known about rod pigments, relatively little is known about cone pigments. This thesis describes the identification and characterization of the photointermediates of gecko cone visual pigment P521: batho (ca. 570 nm), …
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Diversification of beaked redfish, Sebastes mentella, along a depth gradient in the central North Atlantic
… by conducting spectral analysis of rod visual pigments. Additionally, de novoRNA-seq analysis of redfish retina transcriptome is presented for a subset of “shallow” and“deep” individuals, in order to characterise differential expression of candidate genesinvolved in visual perception in …
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Investigations of the Trophic Relationships, Feeding Ecology and Feeding Behavior of Larval Spot, <i>Leiostomus Xanthurus</i> Lacepede, and Atlantic Croaker, <i>Micropogonias Undulatus</i> (Linnaeus) (Pisces:Sciaenidae)
… not related to size-limited ingestion, but to visual profile and reactive distance. These results were in accordance with predictions made by optimal foraging theory and two other food selection models.</p> <p>The feeding incidence of three age classes of Leiostomus xanthurus, on the rotifer …
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Crustacean phylogenetic systematics and opsin evolution
… bound to an integral membrane protein (opsin), visual pigments are phenotypically characterized by the wavelength of maximal absorption (λmax). The underlying molecular mechanism controlling λmax is the interaction between the opsin amino acid sequence and the chromophore. While a plethora of …