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Showing 1 to 13 of 13 for “"Bacteriochlorophyll"”.
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Theoretical Studies of Quantum Dynamics
… photoexcited special pair, the reduced accessory bacteriochlorophyll and the reduced bacteriopheophytin of the L branch which interact with a dissipative medium of protein and solvent degrees of freedom. We found that a free energy of the reduced bacteriochlorophyll state about 400 cm$\sp{-1}$ …
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Pigment-Pigment Interactions and Protein Dynamics in Light-Harvesting Complexes: a Single-Molecule Study
… of experiments the spectral properties of the bacteriochlorophyll a molecules within the complexes were studied in the view of model systems of molecular aggregates. It was found that the excitations in the B800 band of the light harvesting 2 complex are mainly localised on individual …
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Investigation of chiral porphyrin aggregates with heterodyne-detected vibrational sum frequency generation spectroscopy
… Photosynthetic pigments, such as chlorophyll and bacteriochlorophyll, are of particular interest since their absorptive role is the first step in the solar harvesting process. Porphyrins, a group of macrocyclic organic compounds closely related to these pigments, have gained attention as simpler …
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Structure And Function Of The FMO Protein From The Photosynthetic Green Sulfur Bacteria
The Fenna-Matthews-Olson: FMO) bacteriochlorophyll a protein has served as a model antenna system for understanding pigment-protein interaction and the energy transfer mechanism. The FMO protein has been extensively studied by a wide range of spectroscopic and theoretical techniques due to its …
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Light-Harvesting, Redox Control, and Biomimicry of the Photosynthetic Antennas of Green Sulfur Bacteria
… light-harvesting pigment into the complex, Bacteriochlorophyll (BChl) f. We show that BChl f is a fully functional pigment in chlorosomes, although it transfers energy less efficiently to the next energy acceptors in the system. Additionally, we have pioneered methods to build …
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Quantum dynamics in the condensed phase: path integrals, master equations and purity
… the behavior in the exciton transfer in bacteriochlorophyll dimer, and show that purity is significantly recovered even at room temperatures in real systems. Finally, we investigate purity in the case of relaxation dynamics, where symmetry considerations lead to an entirely different …
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Use of a Purple Non-Sulphur Bacterium, Rhodopseudomonas palustris, as a Biocatalyst for Hydrogen Production from Glycerol
… appropriate wavelengths can excite cytochrome bacteriochlorophyll complexes II in R. palustris to generate hydrogen. Among white LEDs, infrared LEDs, and incandescent light bulbs, at the same light intensity, infrared LEDs gave the best results in the H2 production rate and energy conversion by …
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Characterizations on bacterial photosynthesis and respiration with optical spectroscopy and magnetic resonance
… transfer from QA- to P+ (special pair of bacteriochlorophyll). Both electron transfers slows down by about 4 fold at room temperature. I have also examined the reactivity of the semiquinones in the LM dimer (Chapter 2). In accordance with previous reports, both semiquinones are less stable …
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate
… related to Erythrobacter longus, an aerobic, bacteriochlorophyll-containing member of the α proteobacteria. DMS production from dissolved DMSP, along with microbial DMSP and DMS removal, was investigated in seawater incubation experiments with the goal of establishing turnover times for DMSP …
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In situ Metabolism and Biogeography of Phototrophic Consortia
>>Novel bacteriochlorophyll e structures and species-specific variability of pigment composition in green sulfur bacteria<< The relative composition of bacteriochlorophyll (BChl) homologs in five different strains of brown-colored green sulfur bacteria was investigated by HPLC-MS/MS and NMR …
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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 …
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Characterizing ancient chemoclines through the use of pigment biomarkers and sedimentary stable isotope signatures
… values. This coupled with the presence of bacteriochlorophyll derivatives is further evidence for the breakdown of permanent stratification and shallowing of the chemocline during sapropel deposition. This study provides a mechanistic link to the strongly depleted δ15Nbulk values in the …
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The Structure of the RC-LH1 Complex from Rps. acidophila: Optical Single-Molecule Spectroscopy and Numerical Simulations
… investigation of the specific arrangement of the 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 …