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 16 of 16 for “"Purple Bacteria"”.
-
Variability of photosynthesis genes in purple bacteria and molecular determinants of their spectral properties
… genes of the photosynthetic apparatus of two purple bacteria, Amoebobacter (Amb.) purpureus ML1 and Roseospirillum (Rss.) parvum 930I, were investigated by molecular biological methods. Analyses were focused on their light harvesting (LH) 1 core antenna, which is encoded within the puf operon. …
-
A comparative look at structure-function roles in light-harvesting dynamics of purple bacteria
… Particularly, light-harvesting in photosynthetic purple bacteria uses a diverse set of tools from species to species to efficiently transfer energy through this protein network. Induced by their habitats, external environmental pressures on the fitness of purple bacteria have caused species to …
-
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 …
-
Computational investigation of light harvesting in purple photosynthetic bacteria
Purple 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. …
-
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
… 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. These chromatophore …
-
A phylogenetic study of the genus Campylobacter
… of the three major phylogenetic branches of the purple bacteria indicated that these genera form a single phylogenetic branch which is only distantly related to the purple bacteria.
-
Thermotolerant purple nonsulfur bacteria from New Zealand geothermal areas
Purple nonsulfur bacteria (PNSB) are a metabolically and nutritionally diverse group of photosynthetic organisms that have been isolated from many environments. Three thermotolerant or mildly thermophilic strains are known from thermal areas in the United States and Japan. Only mesophilic isolates …
-
Studies on the different types of LH2 complexes from the purple non-sulphur photosynthetic bacterium Rhodopseudomonas palustris strain 2.1.6
Some purple bacteria species, such as Rhodopseudomonas palustris 2.1.6, produce light harvesting antenna (LH2) with unusual absorption spectra when they are grown under low-light intensities. This ability is often related to the presence of multiple genes encoding the LH2 apoproteins. This thesis …
-
Pigment-Pigment Interactions and Protein Dynamics in Light-Harvesting Complexes: a Single-Molecule Study
… 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 in the view of model systems of …
-
Quantum physics of photosynthetic light-harvesting
… recently. The photosynthetic unit (PSU) of purple bacteria combines a nanometric assembly of three protein complexes: (i) the photosynthetic reaction center, (ii) a ring-shaped light harvesting complex LH-I, and (iii) multiple copies of a similar complex, LH-II. The model describes in detail …
-
Photophysics of Biological and Synthetic Multichromophoric Systems : Spectroscopic Investigations of Bacterial Light-Harvesting Complexes and of Carbonyl-Bridged Triarylamine Derivatives
… a natural light-harvesting complex from purple bacteria, -a hybrid system built from a spherical gold nanoparticle (AuNP) and a light-harvesting complex II (LH2), another light-harvesting complex from purple bacteria, -two novel artificial light-harvesting systems, based on …
-
Spectroscopic Investigations of Light-Harvesting 2 Complexes from Rps. acidophila
… apparatus of anoxygenic non-sulfur purple bacteria has already provided a deep insight into how nature has developed a pigment-protein complex with highly efficient light-harvesting and energy transfer characteristics on a confined nanoscale geometry. In order to gain more detailed …
-
Optimisation of use of waste materials by Rhodopseudomonas palustris
… time that CphA2 is found outside of the cyanobacteria, and that there have been several horizontal gene transfers of the *cphA2* gene. An engineered strain of *R. palustris* carrying a heterologous *cphA1* gene is generated. The strain is shown to be able to synthesise cyanophycin. The …
-
Optimizing electrogenic activity from photosynthetic bacteria in bioelectrochemical systems
… further. In addition to Synechocystis, the purple non-sulphur α-proteobacterium Rhodopseudomonas palustris CGA009 was used to test the effect of storage molecule synthesis knockout in a more industrially relevant organic carbon source driven BES, or microbial fuel cell (MFC). However, the …
-
The Structure of the RC-LH1 Complex from Rps. acidophila: Optical Single-Molecule Spectroscopy and Numerical Simulations
… 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 RC-LH1 core complex. As part of a cyclic electron transport pathway in bacterial …