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 19 of 19 for “"LIGHT-HARVESTING COMPLEXES"”.
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Molecular Genetic Analysis of Rhodobacter Sphaeroides Light-Harvesting Complexes
The genes for the Rhodobacter sphaeroides light-harvesting, B875-$\beta$ and B875-$\alpha$ polypeptides (pufB and pufA) are closely linked to the genes for the reaction center-L and reaction center-M polypeptides (pufL and pufM) on what has been termed the puf operon (gene order pufB,A,L,M). The …
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Pigment-Pigment Interactions and Protein Dynamics in Light-Harvesting Complexes: a Single-Molecule Study
Light harvesting complexes that are involved in the first steps of photosynthesis in purple bacteria were studied with low-temperature optical single molecule spectroscopy. In one series of experiments the spectral properties of the bacteriochlorophyll a molecules within the complexes were studied …
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Photophysics of Biological and Synthetic Multichromophoric Systems : Spectroscopic Investigations of Bacterial Light-Harvesting Complexes and of Carbonyl-Bridged Triarylamine Derivatives
… the basic building blocks for the absorption of light and the subsequent energy transfer within photosynthetic organisms. Optimized by evolutionary selection processes, they constitute an ideal blueprint for artificial, nature-inspired multichromophoric light-harvesting systems. This thesis …
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Pigment composition in heterotrophically and photoheterotrophically grown rhodopseudomonas capsulata
… carotenoids were isolated from anaerobically lightgrown Rps. cczpsutata and seven of these from aerobically dark-grown cells. The relative amounts were different. After a typical transfer, anaerobiosis was rapidly achieved but there was a 50 minute lag before the onset of RITA synthesis, and …
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Heterogeneous Ultrafast Energy Transfer in Photosynthetic Proteins
… these results by applying SM2P to photosynthetic light- harvesting systems, where we are able to directly measure the distribution of energy transfer rates on cyanobacterial light-harvesting subunits. These novel experiments provide insight into how photosynthetic light-harvesting proteins are …
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Quantum Physics of Photosynthetic Light -Harvesting
Absorption of light by light harvesting complexes and transfer of electronic excitation to the photosynthetic reaction center (RC) constitutes the primary step of photosynthesis, i.e., the light harvesting process. A model for an atomic level structure of a so-called photosynthetic unit of the …
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Quantum physics of photosynthetic light-harvesting
Absorption of light by light harvesting complexes and transfer of electronic excitation to the photosynthetic reaction center (RC) constitutes the primary step of photosynthesis, i.e., the light harvesting process. A model for an atomic level structure of a so-called photosynthetic unit of the …
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Excitation evolution and self-regulation ability of photosynthetic light-harvesting systems /
… excitation energy transfer in photosynthetic light-harvesting systems is studied together with the self-regulatory molecular mechanisms utilized by plants to quickly adopt to the varying environment conditions. These mechanisms, known as non-photochemical quenching, allow plants to efficiently …
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Sužadinimo evoliucija ir savireguliacijos geba fotosintetinėse šviesą surenkančiose sistemose /
… excitation energy transfer in photosynthetic light-harvesting systems is studied together with the self-regulatory molecular mechanisms utilized by plants to quickly adopt to the varying environment conditions. These mechanisms, known as non-photochemical quenching, allow plants to efficiently …
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Computational investigation of light harvesting in purple photosynthetic bacteria
… photosynthetic bacteria achieve remarkably high light harvesting efficiency, thus reconciling multiple competing processes in the chromatophore. The first step in photosynthesis is the capture and transport of light energy in the form of short-lived electronic excitation called excitons. Rapid …
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Exploring Structure Function Relationship using Bio-Inspired DNA-Chromophore Complexes
Natural light harvesting complexes absorbs and transfers energy towards the reaction center with remarkably high quantum efficiency in the presence of thermal fluctuations. Furthermore, this network of natural complexes delivers absorbed energy via a series of exciton transport steps with an …
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Understanding Ultrafast Energy Transfer across the Photosynthetic Membrane of Purple Bacteria with Near-Native Systems
Purple bacteria are able to capture sunlight and convert it to chemical energy through charge separation with almost 100% quantum efficiency. This remarkable efficiency is due to the arrangement of their pigments into pigment-protein complexes that are further arranged into a larger antenna network …
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Photoelectrochemical and photophysical studies of carbon nanotube and molybdenum disulfide based light harvesting devices
… which may be exploited for solar energy harvesting and conversion. Understanding their fundamental properties and developing relevant manufacturing strategies will thus pave the road toward high-performance, cost-effective, light-harvesting devices.</p> <p>This thesis has investigated …
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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
… on two different biological systems: (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 …
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Redox Homeostasis in Cyanobacteria
… comprised of redox active intermediates and light harvesting complexes. While oxygen is a necessary byproduct of water oxidation and the source of photosynthetic electrons, its presence is also dangerous because leakage of electrons and excitation energy can interact with molecular oxygen to …
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Aerosol Processes Enabling Solar Energy Applications
… to produce clean energy: electron generation by light-harvesting molecules, hydrogen: H<sub>2</sub>) formation by water photolysis, and transformation of CO<sub>2</sub> into hydrocarbon fuels. Photocatalytic metal oxides are commoly used for those energy production processes.</p><p>Photocatalytic …
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The Structure of the RC-LH1 Complex from Rps. acidophila: Optical Single-Molecule Spectroscopy and Numerical Simulations
… bacteriochlorophyll (BChl) a molecules in the light-harvesting 1 (LH1) complex from Rhodopseudomonas (Rps.) acidophila. In purple bacteria the LH1 complex forms an interconnected unit with a reaction-center (RC) complex, where the LH1 complex directly surrounds the RC to form the so called …
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ΜΕΤΑΒΟΛΕΣ ΣΤΗ ΣΥΣΤΑΣΗ ΚΑΙ ΣΤΙΣ ΦΩΤΟΧΗΜΙΚΕΣ ΕΝΕΡΓΟΤΗΤΕΣ ΤΗΣ ΦΩΤΟΣΥΝΘΕΤΙΚΗΣ ΜΕΜΒΡΑΝΗΣ ΧΛΩΡΟΠΛΑΣΤΩΝ ΦΥΛΛΩΝ PHASEOLUS VULGARIS ΚΑΤΑ ΤΗΝ ΑΝΑΔΙΟΡΓΑΝΩ...
ΣΚΟΠΟΣ ΤΟΥ ΔΙΔΑΚΤΟΡΙΚΟΥ ΗΤΑΝ ΝΑ ΔΙΕΡΕΥΝΗΘΕΙ ΚΑΤΑ ΠΟΣΟ ΤΑ ΔΙΑΦΟΡΑ ΧΛΩΡΟΦΥΛΛΟΠΡΩΤΕΙΝΙΚΑ ΣΥΜΠΛΟΚΑ, ΜΕΤΑ ΤΟ ΣΧΗΜΑΤΙΣΜΟ ΤΟΥΣ ΚΑΙ ΤΗΝ ΟΡΓΑΝΩΣΗ ΤΟΥΣ ΣΕ ΔΡΑΣΤΙΚΕΣ ΦΩΤΟΣΥΝΘΕΤΙΚΕΣ ΜΟΝΑΔΕΣ, ΕΙΝΑΙ ΣΤΑΘΕΡΑ 'Η ΠΑΡΑΤΗΡΕΙΤΑΙ ΑΝΑΔΙΟΡΓΑΝΩΣΗ ΤΩΝ ΣΥΣΤΑΤΙΚΩΝ ΤΟΥΣ. ΒΡΕΘΗΚΕ ΟΤΙ ΣΕ ΧΛΩΡΟΠΛΑΣΤΕΣ ΠΟΥ ΒΡΙΣΚΟΝΤΑΙ ΣΤΟ ΣΤΑΔΙΟ …