Quantum Electrodynamics of Photosynthesis PDF Download

Author: Artur Braun
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110629941
Category : Science
Languages : en
Pages : 456

View

Book Description
This book uses an array of different approaches to describe photosynthesis, ranging from the subjectivity of human perception to the mathematical rigour of quantum electrodynamics. This interdisciplinary work draws from fields as diverse as astronomy, agriculture, classical and quantum optics, and biology in order to explain the working principles of photosynthesis in plants and cyanobacteria.

Author: Artur Braun
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110627000
Category : Science
Languages : en
Pages : 552

View

Book Description
This book uses an array of different approaches to describe photosynthesis, ranging from the subjectivity of human perception to the mathematical rigour of quantum electrodynamics. This interdisciplinary work draws from fields as diverse as astronomy, agriculture, classical and quantum optics, and biology in order to explain the working principles of photosynthesis in plants and cyanobacteria.

Author: Michael Brooks
Publisher: Abrams
ISBN: 146831159X
Category : Science
Languages : en
Pages : 219

View

Book Description
“Engaging . . . touches on advanced computing, essential differences between men and women, the power of the will to live, mysteries of the cosmos and more.” —The Washington Post The atom. The Big Bang. DNA. Natural selection. All are ideas that revolutionized science—and all were dismissed out of hand when they first ap­peared. The surprises haven’t stopped in recent years, and in At the Edge of Uncertainty, bestselling author Michael Brooks investigates the new wave of radical insights that are shaping the future of scientific discovery. Brooks takes us to the extreme frontiers of what we understand about the world. He journeys from the observations that might rewrite our story of how the cosmos came to be, through the novel biology behind our will to live, and on to the physi­ological root of consciousness. Along the way, he examines the gender im­balance in clinical trials, explores how merging hu­mans with other species might provide a solution to the shortage of organ donors, and finds out whether the universe really is like a computer or if the flow of time is a mere illusion. “Absorbing . . . scintillating . . . the edgy edge of scientific investigation presented with verve.” —Kirkus Reviews “Mind-bending . . . Brooks handily works his way through these thorny problems, highlighting current research and researchers along the way.” —Publishers Weekly (starred review)

Author: Fabio Pitari (t.d.-)
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description

Author: Alexander Bastiaan Doust
Publisher:
ISBN: 9780494157480
Category :
Languages : en
Pages : 464

View

Book Description
This thesis is a comprehensive study of the optical properties and the critical role of phycobiliproteins in the absorption of green light for photosynthesis in cryptophyte algae (Rhodomonas CS24 and Chroomonas CCMP270). Investigations of two different isolated proteins, phycoerythrin 545 and phycocyanin 645, are described. In addition, the intact algae are investigated to elucidate the workings of these antennae proteins within the machinery of the organism. The crystal structures of these proteins are known to 0.97 and 1.4 A resolution, respectively. These data confirm that the proteins each bind eight open-chain tetrapyrrole phycobilin chromophores, which, in these proteins, are phycoerythrobilin, dihydrobiliverdin, phycocyanobilin, and mesobiliverdin. These bilins are covalently attached to the protein backbone by cysteine bonds. The extended conformation, conjugation length, protonation state and electronic couplings to other bilins or protein residues all play an important role in ensuring that these pigments function efficiently as photosynthetic light harvesters. Chapter 1 of this thesis outlines the evolution of phycobiliproteins and cryptophyte algae, as well as describing in detail the structures of both phycoerythrin 545 and phycocyanin 645. Chapter 2 provides a background to all the experimental and computational techniques that are employed, as well as the data analysis and global and target modeling of the ultrafast data. Chapter 3 describes the results and discussion of all the work on phycoerythrin 545, with Chapter 4 describing the subsequent experiments that reveal the role of phycoerythrin 545 in the overall photosynthetic energy transfer pathways in intact algae. Chapter 5 is an up-to-date evaluation of phycoerythrin 645, where structural data is combined with steady state and ultrafast heterodyne detected transient grating to generate a non-quantitative model of function. Chapter 6 provides a combined conclusion to all the work that has been performed and presented in this thesis. These phycobilins are the focus of most of the work. Steady-state spectroscopies, including polarization anisotropy and circular dichroism, are combined with ultrafast transient grating and transient absorption spectroscopies and subsequent global analyses to reveal a detailed picture of energy transfer within the proteins. In addition, energy transfer from phycoerythrin 545 to chlorophyll-containing light harvesting complexes and photosystems in intact algae is investigated by steady-state spectroscopy and time-resolved fluorescence. Quantum mechanical computational methods are employed to calculate phycobilin excited states, and generate transition density cubes which are used to accurately determine the electronic coupling between the chromophores in phycoerythrin 545 and phycocyanin 645. Modelling of the phycobilin lineshape function has allowed the precise estimation of the energy transfer times among the bilins in phycoerythrin 545 by way of the generalized Forster theory as well as reproducing the absorption and circular dichroism spectra. Kinetic models for exciton dynamics in both proteins are presented. The roles of the central dimer bilins and the final energy transfer step between the two red-most DBV bilins in phycoerythrin 545 are discussed in detail.

Author: Rainer Müller
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 311071745X
Category : Science
Languages : en
Pages : 224

View

Book Description

Author: Kärin Nickelsen
Publisher: BoD – Books on Demand
ISBN: 395234219X
Category : History
Languages : en
Pages : 146

View

Book Description
Whoever turns to the history of photosynthesis research in the twentieth century is soon confronted with the fact that one of its most exciting periods, the years from 1920 to 1960, was in large part overshadowed by a bitter controversy in which many of the leading scientists in the field were involved. It centered on the question, how efficient the process of photosynthesis was. This book attempts a reconstruction of the course of the controversy, based on previously unknown archival sources, and analyzes the arguments brought forward by the two parties.

Author: Roberta Croce
Publisher: CRC Press
ISBN: 1351242873
Category : Science
Languages : en
Pages : 778

View

Book Description
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: Kazuaki Sakoda
Publisher: Springer
ISBN: 3662143240
Category : Science
Languages : en
Pages : 230

View

Book Description
Deals not only with the properties of the radiation modes inside the crystals but also with their peculiar optical response to external fields. A general theory of linear and nonlinear optical response is presented in a clear and detailed fashion using the Green’s function method. Important recent developments such as the enhancement of stimulated emission, second harmonic generation, quadrature-phase squeezing, and low-threshold lasing are likewise treated in detail and made understandable. Numerical methods are also emphasised. This book provides both introductory knowledge for graduate and undergraduate students and important ideas for researchers.

Author: Mohammad Pessarakli
Publisher: CRC Press
ISBN: 1315360195
Category : Science
Languages : en
Pages : 1898

View

Book Description
Since the publication of the previous editions of the Handbook of Photosynthesis, many new ideas on photosynthesis have emerged in the past decade that have drawn the attention of experts and researchers on the subject as well as interest from individuals in other disciplines. Updated to include 37 original chapters and making extensive revisions to the chapters that have been retained, 90% of the material in this edition is entirely new. With contributions from over 100 authors from around the globe, this book covers the most recent important research findings. It details all photosynthetic factors and processes under normal and stressful conditions, explores the relationship between photosynthesis and other plant physiological processes, and relates photosynthesis to plant production and crop yields. The third edition also presents an extensive new section on the molecular aspects of photosynthesis, focusing on photosystems, photosynthetic enzymes, and genes. New chapters on photosynthesis in lower and monocellular plants as well as in higher plants are included in this section. The book also addresses growing concerns about excessive levels and high accumulation rates of carbon dioxide due to industrialization. It considers plant species with the most efficient photosynthetic pathways that can help improve the balance of oxygen and carbon dioxide in the atmosphere. Completely overhauled from its bestselling predecessors, the Handbook of Photosynthesis, Third Edition provides a nearly entirely new source on the subject that is both comprehensive and timely. It continues to fill the need for an authoritative and exhaustive resource by assembling a global team of experts to provide thorough coverage of the subject while focusing on finding solutions to relevant contemporary issues related to the field.