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Author : Thomas Renger
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (487 download)
Download or read book Ultrafast Excitation Energy Transfer Dynamics in Photosynthetic Pigment-protein Complexes written by Thomas Renger and published by . This book was released on 2001 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eleonora De Re
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (94 download)
Download or read book Multidimensional Ultrafast Spectroscopy of Photosynthetic Pigment-Protein Complexes written by Eleonora De Re and published by . This book was released on 2014 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the application of ultrafast spectroscopy to the investigation of pigment-protein complexes (PPCs) involved in energy transfer and energy dissipation in photosynthetic organisms. PPCs are the building blocks of all photosynthetic organisms, and within individual pigment-protein complexes, energy transfer dynamics occur over fast timescales and broad spectral regions. Chapter 1 gives an introduction to the capability of photosynthetic organisms to absorb light energy, funnel this energy to a location for charge separation, and perform charge separation with subsequent conversion into chemical energy. All of these functions need to be performed efficiently under different light conditions. This chapter also includes a discussion of the different light harvesting strategies that various photosynthetic organisms have evolved. Lastly, this chapter discusses the application of ultrafast spectroscopy as an excellent tool to study the dynamics of PPCs. The three experimental techniques used in this dissertation are introduced in this chapter. Chapters 2 and 3 present the application of two ultrafast spectroscopic techniques, two dimensional electronic spectroscopy and transient absorption spectroscopy, to the investigation of the structure-function relationship of photosynthetic pigment-protein complexes. Chapter 2 is an investigation of the photophysics of the two forms of the Orange Carotenoid Protein, involved in excess energy dissipation in cyanobacteria. Ultrafast spectroscopy allows us to understand how a conformational change that modifies pigment-protein interactions is able to generate a different biological function. Chapter 3 presents degenerate and non-degenerate two dimensional electronic spectroscopy experiments to investigate the energy transfer dynamics and couplings in the bacterial reaction center, which is the location of charge separation. Chapter 4 investigates a PPC involved in excess energy dissipation in green algae, LhcSR. Fluorescence lifetime spectroscopy is used to investigate the excited state properties of LhcSR, which plays a role as light harvester, pH sensor and quencher in algae. The results allow us to identify two conformations, a light harvesting one and a quenching one. Transient absorption spectroscopy is used to investigate the energy transfer pathways involved in quenching in the two different conformations. Finally, Chapter 5 presents conclusions and extensions to future work, in order to improve our understanding of the energy transfer dynamics in natural photosynthetic systems.
Author : Scott McClure
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Investigation of Light-harvesting Dynamics of Photosynthetic Pigment-protein Complexes Using Ultrafast Spectroscopy written by Scott McClure and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Herbert van Amerongen
Publisher : World Scientific
ISBN 13 : 9789810232801
Total Pages : 612 pages
Book Rating : 4.2/5 (328 download)
Download or read book Photosynthetic Excitons written by Herbert van Amerongen and published by World Scientific. This book was released on 2000 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excitons are considered as the basic concept used by describing the spectral properties of photosynthetic pigment-protein complexes and excitation dynamics in photosynthetic light-harvesting antenna and reaction centers. Following the recently obtained structures of a variety of photosynthetic pigment-protein complexes from plants and bacteria our interest in understanding the relation between structure, function and spectroscopy has strongly increased. These data demonstrate a short interpigment distance (of the order of 1 nm or even smaller) and/or a highly symmetric (ring-like) arrangement of pigment molecules in peripheral light-harvesting complexes of photosynthetic bacteria. Books which were devoted to the exciton problem so far mainly considered the spectral properties of molecular crystals. However, the small size of these pigment aggregates in the pigment-protein complexes as well as the role of the protein, which is responsible for the structural arrangement of the complex, clearly will have a dramatic influence on the pigment spectra and exciton dynamics. All these aspects of the problem are considered in this book. Exciton theory is mainly considered for small molecular aggregates (dimers, ring-like structures etc.). Together with the theoretical description of the classical conceptual approach, which mainly deals with polarization properties of the absorption and fluorescence spectra, the nonlinear femtosecond spectroscopy which is widely used for investigations now is also discussed. A large part of the book demonstrates the excitonic effects in a multitude of photosynthetic pigment-protein complexes and how we can understand these properties on the basis of the exciton concept.
Author : Phillip David Long
Publisher :
ISBN 13 : 9781303423178
Total Pages : 147 pages
Book Rating : 4.4/5 (231 download)
Download or read book Energy Transfer Dynamics in Photosynthetic Pigment-protein Complexes written by Phillip David Long and published by . This book was released on 2013 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: All this work required the creation of a biological wing in the Engel laboratories. Although publications provide a framework for biological work, the reality is innumerable small details enable success in reasonable timescales. Therefore, I also include a detailed biological methods section here to help future researchers achieve success quickly.
Author : Nicoleta Herascu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Effects of Distribution of Excitation Energy Transfer Times and Protein Dynamics on Spectral Hole Burning in Pigment-protein Complexes Involved in Photosynthesis written by Nicoleta Herascu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leonas Valkunas
Publisher : John Wiley & Sons
ISBN 13 : 3527653678
Total Pages : 414 pages
Book Rating : 4.5/5 (276 download)
Download or read book Molecular Excitation Dynamics and Relaxation written by Leonas Valkunas and published by John Wiley & Sons. This book was released on 2013-10-04 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work brings together quantum theory and spectroscopy to convey excitation processes to advanced students and specialists wishing to conduct research and understand the entire fi eld rather than just single aspects. Written by experienced authors and recognized authorities in the field, this text covers numerous applications and offers examples taken from different disciplines. As a result, spectroscopists, molecular physicists, physical chemists, and biophysicists will all fi nd this a must-have for their research. Also suitable as supplementary reading in graduate level courses.
Author : Gabriela Sadira Schlau-Cohen
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (94 download)
Download or read book Multidimensional Spectroscopy of Photosynthetic Complexes written by Gabriela Sadira Schlau-Cohen and published by . This book was released on 2011 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments using two-dimensional (2D) electronic spectroscopy to investigate the structure-function relationships that give rise to photosynthetic energy transfer within pigment protein complexes are presented and discussed in this dissertation. 2D electronic spectroscopy using ultrafast laser pulses throughout the visible regime was applied to study excitation energy transfer in the major light harvesting complex of photosystem II (LHCII) and the reaction center from purple bacteria. These experiments elucidated information about the excited state structure and the energy transfer timescales within these complexes. All-parallel 2D spectroscopy was used to monitor the energy transfer dynamics in LHCII and reveals previously unobserved sub-100 fs energy transfer between the chlorophyll-b (Chl-b) and chlorophyll-a (Chl-a) bands and within the Chl-a band. Reproducing these results with simulations led to improvements in the values of the uncoupled transition energies of the chlorophyll in the working Hamiltonian of LHCII. The delocalized excited states observed in the experimental and theoretical results were found to increase the range of optimal angles for energy transfer from LHCII to neighboring pigment-protein complexes, as opposed to the case of a single, isolated donor excited state. Polarized 2D spectroscopy experiments reported here identified previously unresolved excitation energy transfer steps in LHCII. These results were used to determine the angle between transition dipole moments of the donor and acceptor. A new method was developed to use the angle between transition dipole moments to find the uncoupled transition energies of the chlorophyll, previously the major unknown for an accurate electronic Hamiltonian. This method was applied to LHCII. Quantum coherence, or a long-lived superposition of excited states, was observed in LHCII using a second polarization sequence. The observable timescales of coherence was determined to be 700-900 fs, which illustrates that quantum coherence lasts longer than many energy transfer steps. The potential contribution of coherence to the robustness of photosynthetic energy transfer to the rugged energy landscape and to temperature variations is discussed. Experiments on the B band of the bacterial reaction center were able to isolate the previously inseparable two peaks and observe energy transfer between these two excited states. A new extension of 2D spectroscopy, two-color 2D spectroscopy, was demonstrated for examining the interactions between two spectrally separate chromophores. Using this approach, energy was found to transfer from the carotenoid to the bacteriochlorophyll both via S1 and via Qx in the bacterial reaction center in an approximately 2:1 ratio, and within about 750 fs.
Author : Olivia C. Fiebig
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Download or read book Understanding Ultrafast Energy Transfer Across the Photosynthetic Membrane of Purple Bacteria with Near-native Systems written by Olivia C. Fiebig and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 within the membrane environment. Peripheral light-harvesting complex 2 (LH2) surrounds the core light-harvesting complex 1 (LH1), which in turn encircles the reaction center (RC). Energy absorbed by LH2 is transferred to LH1 and then finally the RC, where it is converted to chemical energy through charge separation. While the energy transfer dynamics of the photosynthetic light-harvesting complexes in purple bacteria have been studied for decades, two key parameters have been largely ignored: first, the ability of purple bacteria to maintain efficiency in fluctuating environmental conditions, and second, the impact of the lipid membrane environment on the energy transfer pathways. In this thesis, I explore these two parameters by investigating the energy transfer dynamics within the purple bacterial antenna network at each step. First, I study intra-complex dynamics by comparing the energy transfer rates within structural and spectral variants of LH2. Second, I investigate inter-complex energy transfer dynamics between LH2 complexes to directly resolve and understand the pair-wise energy transfer dynamics within the membrane. Finally, I investigate the influence of lipid environment on LH1 to RC energy transfer. These studies are made possible by the use of model membrane nanodiscs, through which I reconstruct the antenna network piece-by-piece to resolve key energy transfer steps in a controlled, near-native environment. Overall, the results show that the energy transfer dynamics within the purple bacterial antenna network are robust to fluctuating environmental conditions, with the membrane itself an active participant in the optimization of these energy transfer processes. Furthermore, these studies reveal the utility of nanodiscs to disentangle the many competing parameters within the membrane that influence protein behavior and energy transfer dynamics.
Author : Roberta Croce
Publisher : CRC Press
ISBN 13 : 1351242873
Total Pages : 793 pages
Book Rating : 4.3/5 (512 download)
Download or read book Light Harvesting in Photosynthesis written by Roberta Croce and published by CRC Press. This book was released on 2018-01-12 with total page 793 pages. Available in PDF, EPUB and Kindle. Book excerpt: This landmark collective work introduces the physical, chemical, and biological principles underlying photosynthesis: light absorption, excitation energy transfer, and charge separation. It begins with an introduction to properties of various pigments, and the pigment proteins in plant, algae, and bacterial systems. It addresses the underlying physics of light harvesting and key spectroscopic methods, including data analysis. It discusses assembly of the natural system, its energy transfer properties, and regulatory mechanisms. It also addresses light-harvesting in artificial systems and the impact of photosynthesis on our environment. The chapter authors are amongst the field’s world recognized experts. Chapters are divided into five main parts, the first focused on pigments, their properties and biosynthesis, and the second section looking at photosynthetic proteins, including light harvesting in higher plants, algae, cyanobacteria, and green bacteria. The third part turns to energy transfer and electron transport, discussing modeling approaches, quantum aspects, photoinduced electron transfer, and redox potential modulation, followed by a section on experimental spectroscopy in light harvesting research. The concluding final section includes chapters on artificial photosynthesis, with topics such as use of cyanobacteria and algae for sustainable energy production. Robert Croce is Head of the Biophysics Group and full professor in biophysics of photosynthesis/energy at Vrije Universiteit, Amsterdam. Rienk van Grondelle is full professor at Vrije Universiteit, Amsterdam. Herbert van Amerongen is full professor of biophysics in the Department of Agrotechnology and Food Sciences at Wageningen University, where he is also director of the MicroSpectroscopy Research Facility. Ivo van Stokkum is associate professor in the Department of Physics and Astronomy, Faculty of Sciences, at Vrije Universiteit, Amsterdam.
Author : C.N. Hunter
Publisher : Springer Science & Business Media
ISBN 13 : 1402088159
Total Pages : 1013 pages
Book Rating : 4.4/5 (2 download)
Download or read book The Purple Phototrophic Bacteria written by C.N. Hunter and published by Springer Science & Business Media. This book was released on 2008-10-11 with total page 1013 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a comprehensive survey of all aspects of these fascinating bacteria, metabolically the most versatile organisms on Earth. It compiles 48 chapters written by leading experts, who highlight the huge progress made in studies of these bacteria since 1995.
Author : Brett Andrew King
Publisher :
ISBN 13 :
Total Pages : 514 pages
Book Rating : 4.F/5 ( download)
Download or read book Ultrafast Dynamics in the Photosynthetic Reaction Center and Green Fluorescent Proteins written by Brett Andrew King and published by . This book was released on 2000 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Agu Laisk
Publisher : Springer Science & Business Media
ISBN 13 : 1402092377
Total Pages : 514 pages
Book Rating : 4.4/5 (2 download)
Download or read book Photosynthesis in silico written by Agu Laisk and published by Springer Science & Business Media. This book was released on 2009-06-19 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photosynthesis in silico: Understanding Complexity from Molecules to Ecosystems is a unique book that aims to show an integrated approach to the understanding of photosynthesis processes. In this volume - using mathematical modeling - processes are described from the biophysics of the interaction of light with pigment systems to the mutual interaction of individual plants and other organisms in canopies and large ecosystems, up to the global ecosystem issues. Chapters are written by 44 international authorities from 15 countries. Mathematics is a powerful tool for quantitative analysis. Properly programmed, contemporary computers are able to mimic complicated processes in living cells, leaves, canopies and ecosystems. These simulations - mathematical models - help us predict the photosynthetic responses of modeled systems under various combinations of environmental conditions, potentially occurring in nature, e.g., the responses of plant canopies to globally increasing temperature and atmospheric CO2 concentration. Tremendous analytical power is needed to understand nature's infinite complexity at every level.
Author : Adam Kell
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (949 download)
Download or read book Energy Transfer and Exciton Dynamics in Photosynthetic Pigment- Rotein Complexes written by Adam Kell and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure-function relationships of natural pigment- rotein complexes are of great interest, as the electronic properties of the pigments are tuned by the protein environment to achieve high quantum yields and photon utilization. Determination of electronic structure and exciton dynamics in protein complexes is complicated by static disorder and uncertainties in the properties of system-bath coupling. The latter is described by the phonon profile (or spectral density), whose shape can only be reliably measured experimentally for the lowest energy state. Low-temperature, laser-based spectroscopies are applied towards model pigment- rotein complexes, i.e., the Fenna-Matthews-Olson (FMO) and water-soluble chlorophyll-binding (WSCP) complexes, in order to study system-bath coupling and energy transfer pathways. Site-selective techniques, e.g., hole burning (HB) and fluorescence line narrowing, are utilized to overcome static disorder and reveal details on homogeneous broadening. In addition, excitonic calculations with non-Markovian lineshapes provide information on electronic structure and exciton dynamics. A new lognormal functional form of the spectral density is recommended which appropriately defines electron-phonon parameters, i.e., Huang-Rhys factor and reorganization energy. Absorbance and fluorescence spectral shifts and HB spectra reveal that samples of FMO may contain a subpopulation of destabilized proteins with modified HB efficiencies. Simulations of spectra corresponding to intact proteins indicate that the entire trimer has to be taken into account in order to properly describe fluorescence and HB spectra. The redshifted fluorescence spectrum of WSCP is described by uncorrelated energy transfer as opposed to previous models of excited state protein relaxation. Also, based on nonconservative HB spectra measured for WSCP, a mechanism of electron transfer between chlorophylls and aromatic amino acids is proposed.
Author : Julia Adolphs
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (246 download)
Download or read book Theory of Excitation Energy Transfer in Pigment Protein Complexes written by Julia Adolphs and published by . This book was released on 2008 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Clemens Hofmann
Publisher : Cuvillier Verlag
ISBN 13 : 3865371299
Total Pages : 183 pages
Book Rating : 4.8/5 (653 download)
Download or read book Pigment pigment interactions and protein dynamics in light harvesting complexes: a single molecule study written by Clemens Hofmann and published by Cuvillier Verlag. This book was released on 2004 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anthony W. D. Larkum
Publisher : Springer Science & Business Media
ISBN 13 : 9400710380
Total Pages : 499 pages
Book Rating : 4.4/5 (7 download)
Download or read book Photosynthesis in Algae written by Anthony W. D. Larkum and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the reader to algal diversity as currently understood and then traces the photosynthetic structures and mechanisms that contribute so much to making the algae unique. Indeed the field is now so large that no one expert can hope to cover it all. The 19 articles are each written by experts in their area; ranging over all the essential aspects and making for a comprehensive coverage of the whole field. Important developments in molecular biology, especially transformation mutants in Chlamydomonas, are dealt with, as well as areas important to global climate change, carbon dioxide exchange, light harvesting, energy transduction, biotechnology and many others. The book is intended for use by graduate students and beginning researchers in the areas of molecular and cell biology, integrative biology, plant biology, biochemistry and biophysics, biotechnology, global ecology, and phycology.
