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 18 of 18 for “"chromatophores"”.
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Photosynthetic regeneration of ATP using native and immobilized bacterial chromatophores.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nutrition and Food Science, 1976
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Quinol oxidation by the ubiquinol:cytochrome c(2) oxidoreductase in the chromatophores from Rhodobacter sphaeroides
… of the high potential chain in the chromatophores from Rhodobacter sphaeroides have been reexamined. It was found that RC, cyt c$\sb2$ and c$\sb1$ after a flash reached a state not far from the expected ideal equilibrium under the conditions of our experiments.
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Black and White: Structural and Functional Aspects of Dermal Chromatophores of the Marbled Whiptail Lizard (Cnemidophorus Marmoratus)
… orientation of three distinct types of dermal chromatophores (xanthophores, iridophores, and melanophores). Here electron microscopy, brightfield microscopy, and reflectance spectroscopy is used to examine some of the structural-functional relationships of the chromatophores of these lizards …
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Cell-Cycle Specific Biosynthesis of the Photosynthetic Membrane of Rhodopseudomonas Sphaeroides: Structural Implications
Fusion of chromatophores, the photosynthetic membrane vesicle isolated from the intracytoplasmic membranes (ICM) of the photosynthetic bacterium Rhodopseudomonas sphaeroides, was achieved by the use of polyethylene glycol as fusogen. Ultracentrifugation, electron microscopy (EM), intrinsic density …
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Chromatophore tissue density and skeletal density banding as a measure of the adaptive response of healthy corals to environmental change
Chromatophores, pigment-bearing cells within the ectodermal layer of hermatypic scleractinian coral tissues, are postulated to enhance the photosynthetic activity of zooxanthellae symbionts and possibly protect the coral animal from harmful ultraviolet (UV) radiation. Yet connections have not …
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Purification and Characterization of the Cytochrome BC(1) Complex From Rhodobacter Sphaeroides
… sphaeroides. The enzyme was extracted from chromatophores using dodecyl maltoside in the presence of glycerol, and was purified by anion exchange and gel filtration chromatography. SDS-polyacrylamide gel electrophoresis showed the presence of four polypeptide subunits with apparent molecular …
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Computational investigations into two biological processes: membrane reshaping by light-harvesting proteins in the chromatophores of purple bacteria, and oligomerization and pore formation by the Hepatitis C viroporin p7
… (1) the light-harvesting proteins in the chromatophores of purple photosynthetic bacteria, and (2) the structure and function of the Hepatitis C viroporin p7. Purple photosynthetic bacteria form membranous pseudo-organelles called chromatophores which house the photosynthetic machinery. …
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Behavioural ecotoxicology of the brown shrimp, Crangon crangon : changing colour in polluted environments
… a commercially important species. It utilizes chromatophores (specialized cells containing pigments) to match its background, changing its colour either from pale (pigments contracted) to dark (pigments expanded) or vice versa, thus becoming almost invisible in its environment. Chromatophores …
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Pigment composition in heterotrophically and photoheterotrophically grown rhodopseudomonas capsulata
… behaved differently following the transfer. Chromatophores were present in aerobic dark-grown cells of Rps. ccrosulata and a method was developed to isolate the active reaction centre complexes and light-harvesting complexes also present. The carotenoids present in both complexes …
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Carbon cycling in the Caribbean reef-building coral Orbicella: quantitative evidence for enzymatic control of skeletal density banding and coral-endosymbiont physiological plasticity during seasonal environmental change
… density of zooxanthellae and the density of the chromatophores change according to positioning on the reef tract, and therefore levels of irradiance to which the host and endosymbiont are exposed. These results are correlated to the measured change in density articulated in the coral skeleton as …
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Poison frog warning signals: From the rainforest to the genome and back again
… the environmental background (typically via chromatophores and pigments). Second, predators must be able to receive and learn to avoid preying upon aposematic individuals based on the signal. And finally, aposematism must confer a fitness benefit to the population of an aposematic species. In …
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Dynamic Plasmonic Systems with Actuating Nanotransducers
… are shown to mimic the optical response of chromatophores, giving rise to substantial changes in colour. This work demonstrates that the optical and physical properties of individual ANTs can be switched with light, and particle ensembles can effectuate significant responses at much larger …
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Exploring the Cephalopod Brain: Towards Mapping the First Whole Brain Connectome and Whole Animal Projectome of a Pygmy Squid
… nerve tracts to the body, such as the arms and chromatophores. This is the first high-resolution image dataset of a whole cephalopod body, to complement the whole brain connectome. Future work will focus on analysing the upcoming dataset from the Multibeam SEM and the existing beamline volume, …
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Inhibitor-Quinone Interactions in Reaction Centers From Rhodopseudomonas Sphaeroides (Herbicide, Triazine, Ubiquinone, Photosynthesis, Resistance)
… inhibitors were found to unbind slowly, even in chromatophores, indicating it to be intrinsically slow. When Q(,A) was semi-reduced, the presence of the electron transfer reaction from Q(,A)('-) to Q(,B) stabilized quinone binding and caused herbicide unbinding. Bacterial mutants resistant to the …
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The Bc(1) Complex of Rhodobacter Sphaeroides and Its Integration Into the Photosynthetic Chain
… in spite of its low concentration in cells and chromatophores, suggesting rapid diffusion of isocyt $c\sb2$,between several chains. Structural models of PufX suggest that it forms a dimer, providing a gate in LH1. The kinetic data also suggest two permeation pathways of quinone through the LH1; …
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Isolation and Identification of the Abnormal Opaque material in the White Mutant of Siamese Fighting Fish, Betta Splendens
… is observed in that purines increase in chromatophores when pteridines decrease. This may be either an enzymatic or hormonal disorder of the chromatophore. Enzymic and hormonal analyses should be done on the Op Bettas. Several genetic crosses are also needed with subsequent pigment, …
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Qo site of the bc1 complex; unlocking the gate of the electron transport chain
… of flash-activated kinetics of the bc1 in chromatophores from wild type and E295 mutant strains of Rhodobacter sphaeroides, which show strong inhibi-tion of QH2 oxidation, and a dramatic difference in pH-dependence of activity. Attention has more recently been focused on the intermediate …