Synthesis Photochemistry And Electrochemistry Of Photosynthetic Model Systems
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Synthesis Photochemistry And Electrochemistry Of Photosynthetic Model Systems
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Author : Feng Gao
language : en
Publisher:
Release Date : 1990
Synthesis Photochemistry And Electrochemistry Of Photosynthetic Model Systems written by Feng Gao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Carotenoids categories.
From Molecules To Materials
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Author : Elena A. Rozhkova
language : en
Publisher: Springer
Release Date : 2015-04-06
From Molecules To Materials written by Elena A. Rozhkova and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-06 with Technology & Engineering categories.
This interdisciplinary book focuses on the various aspects transformation of the energy from sunlight into the chemical bonds of a fuel, known as the artificial photosynthesis, and addresses the emergent challenges connected with growing societal demands for clean and sustainable energy technologies. The editors assemble the research of world-recognized experts in the field of both molecular and materials artificial systems for energy production. Contributors cover the full scope of research on photosynthesis and related energy processes.
Quatre Pi Ces Com Dies En Un Acte De Georges Feydeau
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Author :
language : en
Publisher:
Release Date : 2009
Quatre Pi Ces Com Dies En Un Acte De Georges Feydeau written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Design And Synthesis Of Molecular Models For Photosynthetic Photoprotection
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Author : Kul Bhushan
language : en
Publisher:
Release Date : 2012
Design And Synthesis Of Molecular Models For Photosynthetic Photoprotection written by Kul Bhushan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Photochemistry categories.
Most of the sunlight powering natural photosynthesis is absorbed by antenna arrays that transfer, and regulate the delivery of excitation energy to reaction centers in the chloroplast where photosynthesis takes place. Under intense sunlight the plants and certain organisms cannot fully utilize all of the sunlight received by antennas and excess redox species are formed which could potentially harm them. To prevent this, excess energy is dissipated by antennas before it reaches to the reaction centers to initiate electron transfer needed in the next steps of photosynthesis. This phenomenon is called non-photochemical quenching (NPQ). The mechanism of NPQ is not fully understood, but the process is believed to be initiated by a drop in the pH in thylakoid lumen in cells. This causes changes in otherwise nonresponsive energy acceptors which accept the excess energy, preventing oversensitization of the reaction center. To mimic this phenomenon and get insight into the mechanism of NPQ, a novel pH sensitive dye 3'6'-indolinorhodamine was designed and synthesized which in a neutral solution stays in a closed (colorless) form and does not absorb light while at low pH it opens (colored) and absorbs light. The absorption of the dye overlaps porphyrin emission, thus making energy transfer from the porphyrin to the dye thermodynamically possible. Several self-regulating molecular model systems were designed and synthesized consisting of this dye and zinc porphyrins organized on a hexaphenylbenzene framework to functionally mimic the role of the antenna in NPQ. When a dye-zinc porphyrin dyad is dissolved in an organic solvent, the zinc porphyrin antenna absorbs and emits light by normal photophysical processes. Time resolved fluorescence experiments using the single-photon-timing method with excitation at 425 nm and emission at 600 nm yielded a lifetime of 2.09 ns for the porphyrin first excited singlet state. When acetic acid is added to the solution of the dyad, the pH sensitive dye opens and quenches the zinc porphyrin emission decreasing the lifetime of the porphyrin first excited singlet state to 23 ps, and converting the excitation energy to heat. Under similar experimental conditions in a neutral solution, a model hexad containing the dye and five zinc porphyrins organized on a hexaphenylbenzene core decays exponentially with a time constant of 2.1 ns, which is essentially the same lifetime as observed for related monomeric zinc porphyrins. When a solution of the hexad is acidified, the dye opens and quenches all porphyrin first excited singlet states to
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1992-06
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-06 with Power resources categories.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1997
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Dissertation abstracts categories.
Erda Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1989
Erda Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Power resources categories.
Research Awards Index
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Author :
language : en
Publisher:
Release Date : 1977
Research Awards Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Medicine categories.
Electrochemical And Optical Studies Of Model Photosynthetic Systems
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Author :
language : en
Publisher:
Release Date : 1992
Electrochemical And Optical Studies Of Model Photosynthetic Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The objective of this research is to obtain a better understanding of the relationship between the structural organization of photosynthetic pigments and their spectroscopic and electrochemical properties. Defined model systems were studied first. These included the least ordered (solutions) through the most highly ordered (Langmuir-Blodgett (LB) monolayers and self-assembled monolayers) systems containing BChl, BPheo, and UQ. Molecules other than the photosynthetic pigments and quinones were also examined, including chromophores (i.e. surface active cyanine dyes and phtahlocyanines) an redox active compounds (methyl viologen (MV) and surfactant ferrocenes), in order to develop the techniques needed to study the photosynthetic components. Because the chlorophylls are photosensitive and labile, it was easier first to develop procedures using stable species. Three different techniques were used to characterize these model systems. These included electrochemical techniques for determining the standard oxidation and reduction potentials of the photosynthetic components as well as methods for determining the heterogeneous electron transfer rate constants for BChl and BPheo at metal electrodes (Pt and Au). Resonance Raman (RR) and surface enhanced resonance Raman (SERR) spectroscopy were used to determine the spectra of the photosynthetic pigments and model compounds. SERRS was also used to study several types of photosynthetic preparations.
Photochemical Photoelectrochemical And Photobiological Processes
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Author : D.O. Hall
language : en
Publisher: Springer Science & Business Media
Release Date : 1982-01-31
Photochemical Photoelectrochemical And Photobiological Processes written by D.O. Hall and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982-01-31 with Science categories.
Proceedings of the EC Contractors' Meeting held in Cadarache, 26-28 October 1981