Light Reaction Path of Photosynthesis

This monograph deals with the light reaction pathway in photosynthesis. The photophysico-chemical events are presented in the order of their occurrence, beginning with the collection of sunlight by antenna systems, ending with the reduction of CO to carbohydrates. Relationships between the structural 2 properties and kinetic effects of primary and secondary events spanning time 12 domains in the range 1O- _ls are explored. Photosynthesis is examined in terms of a light-induced redistribution of reaction intermediates common to the biosynthesis and metabolic degradation of carbohydrates. The experimental procedures and results reviewed in the book are repre sentative of developments in instrumental methods and conceptual formula tions in this area during the past decade. In particular, picosecond spectroscopy, time-resolved and magnetic resonance techniques, along with structural and photoelectrochemical models of photosynthesis, have provided clues for the molecular mechanisms of energy migration from the antenna systems to the reaction centers, and of succeeding stages of photochemical events leading to the carbon-reduction cycle. The preparation of this monograph resulted from the efforts of workers in distantly separated institutions. The writer gratefully acknowledges the responsive collaboration of the contributing authors and members of the Springer editorial staff that made possible completion of the manuscript.

Contenu
1: Free Energy Change for Quantum Storage in Photosynthesis.- 1 Introduction.- 2 Definition of the Primary Photochemical Reaction.- 3 Photopotential, Photooverpotential and Free Energy Change for Quantum Storage in Photosynthesis.- 4 Outline of this Book.- References.- 2: Phycobiliproteins: Molecular Aspects of a Photosynthetic Antenna System.- 1 Introduction.- 2 Morphology.- 3 Energy Transfer.- 4 Chromophore Structure.- 5 Noncovalent Protein Chromophore Interactions.- 6 The Proteins.- 7 Biosynthesis.- 8 Concluding Remarks.- Notes Added in Proof.- References.- 3: Structure and Excitation Dynamics of Light-harvesting Protein Complexes.- 1 Introduction.- 2 Experimental Methods.- 3 Excited State Annihilation.- 4 Anaerobic Photosynthetic Bacteria.- 5 Lower Algae.- 6 Antenna Pigment-Protein Complexes from Higher Plants.- References.- 4: Photooxidation of the Reaction Center Chlorophylls and Structural Properties of Photosynthetic Reaction Centers.- Abbreviations and Symbols.- 1 Introduction.- 2 The Photosystem of Purple Bacteria.- 3 The Plant Photosystems.- 4 Structure of the Bacterial Primary Donor-Acceptor Complex.- References.- Notes Added in Proof (In Connection with Chapter 8).- 5: Triplet State and Chlorophylls.- Abbreviations.- 1 Introduction.- 2 Optical-Magnetic Resonance Spectroscopy.- 3 Triplet State Studies of Model Chlorophyll Compounds.- 4 In-Vivo Chlorophyll Triplets.- 5 Summary.- References and Notes.- 6: The Chlorophyll Triplet State and the Structure of Chlorophyll Aggregates.- 1 Introduction.- 2 Optically Detected Magnetic Resonance in the Triplet State.- 3 Application of ODMR to the Chlorophyll Triplet State.- 4 Application of Triplet State ODMR to Chlorophyll Aggregate Structure.- References.- 7: Synthetic Approaches to Photoreaction Center Structure andFunction.- 1 Introduction.- 2 Porphyrin Models of Photoreaction Center Chlorophylls.- 3 Noncovalent Chlorophyll Special Pair Models.- 4 Preparation of Singly Linked Covalent Chlorophyll Dimers.- 5 Solvent-dependent Structure of Singly Linked Covalent Chlorophyll Dimers.- 6 Photophysical Properties of Singly Linked Covalent Chlorophyll Dimers.- 7 Photochemical Properties of Singly Linked Covalent Chlorophyll Dimers.- 8 Biomimetic Charge Separation Photochemistry.- 9 Doubly Linked Chlorophyll Cyclophane Models of Special Pair Structure.- 10 Concluding Remarks.- References.- 8: Light Path of Carbon Reduction in Photosynthesis.- 1 Introduction.- 2 Scope.- 3 Model for Chlorophyll Light Reactions in Photosynthesis.- 4 Dimer Model of P700.- 5 P680 Model and Water Splitting.- 6 Carbon Reduction by Water.- 7 Two-Photon Activation of Water Splitting.- 8 Primary and Secondary Processes of Photosynthesis.- 9 Further Conclusions.- References.- Notes Added in Proof for Chapter 4.- Author Index.