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.
Results
Showing 1 to 20 of 168 for “"light-harvesting"”.
-
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 …
-
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 …
-
Germanium Nanostructures for Efficient Light Harvesting Devices
… and, in general, for efficient energy-tunable light harvesting devices. Among them, Ge reveals interesting optical properties due to its quasi-direct bandgap and larger absorption coefficient that make it intrinsically more suitable than Si for what concerns light harvesting applications. …
-
WO3-based bifunctional devices for light harvesting-energy storage
L'abstract è presente nell'allegato / the abstract is in the attachment
-
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 …
-
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 …
-
Light Harvesting and Energy Transfer in Metal-Organic Frameworks
… reaction centers of photosystems I and II. Highlighted by highly-ordered crystal structures and synthetic tunability via crystal engineering, metal–organic frameworks (MOFs) have the potential to mimic the natural photosynthetic systems in terms of the efficiency and directionality of energy …
-
Spectroscopic Investigations of Light-Harvesting 2 Complexes from Rps. acidophila
A better understanding of light capturing and energy transfer processes in natural photosynthesis can contribute to the development of a highly efficient, artificial, molecular-based technology that utilizes the sun for mankind’s energy supply. Being a prominent example, the light-harvesting 2 …
-
Resonant energy transfer in light harvesting and light emitting applications
The performance of light emitting and light harvesting devices is improved by utilising resonant energy transfer. In lighting applications, the emission energy of a semiconductor heterostructure and the absorption of organic dyes or colloidal quantum dots (QDs) are engineered so that the …
-
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 …
-
DNA Origami Structures for Artificial Light-Harvesting and Optical Voltage Sensing
… we apply DNA nanotechnology for developing novel light-harvesting and optical voltage sensing nano-devices. We use the programmable positioning of dye molecules on a DNA origami plate as a mimic of a light-harvesting antenna complex required for photosynthesis. Such a structure allows us to …
-
Triplet Excitons in Natural Photosynthetic and Artificial Light Harvesting Systems: Measurement and Modeling.
Under full sunlight, unprotected (Bacterio)Chlorophyll ((B)Chl) molecules photodegrade in a matter of minutes. This is the result of the generation of highly reactive singlet oxygen (1O2) by energy transfer from the (B)Chl triplet state (3(B)Chl) to the oxygen ground state. Natural photosynthetic …
-
Structural and Functional Characterization of the Light-Harvesting Complex of the Chloroplast Membrane
Made available in DSpace on 2015-05-14T15:08:31Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8004144.PDF: 4172479 bytes, checksum: b2cbf9feafac4a1c9e95755643d5fa71 (MD5) Previous issue date: 1979
-
Imaging spectroscopy and combinatorial mutagenesis of light harvesting II antenna from Rhodobacter capsulatus
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
-
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 …
-
Light-Harvesting, Redox Control, and Biomimicry of the Photosynthetic Antennas of Green Sulfur Bacteria
… hot springs. These bacteria are champions of lowlight adaptation, with some species being able to thrive photosynthetically on less than eight photons hr-1 per pigment. We have studied the two photosynthetic antenna complexes from these organisms that are responsible for light capture: the …
-
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 …
-
Peptide Mediated Co-assembly of Porphyrin: Towards Sustainable Biomaterials for Light Harvesting and Catalysis
<p>The diverse molecular functions of naturally occurring biomaterials designed from proteins are fundamentally based on a set of conserved building blocks, namely the 20 gene coded amino acids. The supramolecular structures and functions of proteins dictates by the self-assembly, where the …
-
Tracking and Exploiting Charge Carrier Movement and Photochemical Processes in Light-Harvesting Energy Materials
… their suitability for use in state-of-the-art light-harvesting structures such as thin-film photovoltaics and photoelectrochemical fuel cells. Such materials offer promising avenues to cheap and efficient sustainable energy solutions. Metal halide perovskites excel in the pursuit of highly …
-
A comparative look at structure-function roles in light-harvesting dynamics of purple bacteria
… photosynthetic organisms have developed a light-harvesting process with near unity quantum efficiency. Light-harvesting proteins transfer energy from the sun to reach a central location, the reaction center, where charge separation occurs and energy is converted to chemical energy. …
Page 1 of 9