A Personal Historical Introduction to Photosystem I: Ferredoxin + FNR, the Key to NADP+ Reduction -- The Discovery of Bound Iron-Sulfur Clusters in Photosystem I by EPR Spectroscopy -- The Discovery of P430 and Work on Photosystem I Electron Acceptors FeS-X and A0 at the Charles F. Kettering Research Laboratory -- Historical Introduction to Photosystem I: The Discovery of the A1 and A2(Fx?) Acceptors by Time-Resolved Optical Spectroscopy -- Association of Photosystem I and Light-Harvesting Complex II during State Transitions -- Structural Analysis of Cyanobacterial Photosystem I -- Structure, Function, and Regulation of Plant Photosystem I -- Molecular Interactions of the Stromal Subunit PsaC with the PsaA/PsaB Heterodimer -- Accessory Chlorophyll Proteins in Cyanobacterial Photosystem I -- LHCI: The Antenna Complex of Photosystem I in Plants and Green Algae -- The Low Molecular Mass Subunits in Higher Plant Photosystem I -- Ultrafast Optical Spectroscopy of Photosystem I -- The Long Wavelength Chlorophylls of Photosystem I -- Mutagenesis of Ligands to the Cofactors in Photosystem I -- Genetic Manipulation of Quinone Biosynthesis in Cyanobacteria -- Optical Measurements of Secondary Electron Transfer in Photosystem I -- EPR Studies of the Primary Electron Donor P700 in Photosystem -- FTIR Studies of the Primary Electron Donor, P700 -- Primary Charge Separation Between P700* and the Primary Electron Acceptor Complex A-A0: A Comparison with Bacterial Reaction Centers -- Fourier Transform Infrared Studies of the Secondary Electron Acceptor, A1 -- Electrogenic Reactions Associated with Electron Transfer in Photosystem I -- High-Field EPR Studies of Electron Transfer Intermediates in Photosystem I -- Transient EPR Spectroscopy as Applied to Light-Induced Functional Intermediates Along the Electron Transfer Pathway in Photosystem I -- Electron Transfer Involving Phylloquinone in Photosystem I -- The Directionality of Electron Transport in Photosystem I -- Electron Transfer from the Bound Iron-Sulfur Clusters to Ferredoxin/Flavodoxin: Kinetic and Structural Properties of Ferredoxin/Flavodoxin Reduction by Photosystem I -- Electron Transfer From Ferredoxin and Flavodoxin to Ferredoxin:NADP+ Reductase -- The Interaction of Ferredoxin with Ferredoxin-Dependent Enzymes -- Electron Transfer Between Photosystem I and Plastocyanin or Cytochrome c6 -- Genetic Dissection of Photosystem I Assembly and Turnover in Eukaryotes -- Assembly of the Bound Iron-Sulfur Clusters in Photosystem I -- The Assembly of Photosystem I Reducing Site -- Thermodynamics of Photosystem I -- Application of Marcus Theory to Photosystem I Electron Transfer -- Modeling of Optical Spectra and Light Harvesting in Photosystem I -- Functional Modeling of Electron Transfer in Photosynthetic Reaction Centers -- Cyclic Electron Transfer Around Photosystem I -- Photoinhibition and Protection of Photosystem I -- Evolutionary Relationships Among Type I Photosynthetic Reaction Centers -- Convergent Evolution of Cytochrome c6 and Plastocyanin. Photosystem I: The Light-Driven, Plastocyanin:Ferre- nature of Photosystem I is evident in the multiplicity th doxin Oxidoreductase is the 24 volume in the of skills and techniques that have proven necessary to series Advances in Photosynthesis and Respiration understand how the energy of a photon of visible light (Series Editor, Govindjee). It is one of the two volumes is converted into the stable products of oxidized pl- that deal with the photosynthetic reaction centers tocyanin (or cytochrome c ) and reduced ferredoxin 6 in oxygenic photosynthetic organisms. The other, (or ?avodoxin). This book is arranged into 11 sections. Volume 22, is Photosystem II: The Light-Driven Following a section on 'Historical Perspectives', the Water:Plastoquinone Oxidoreductase, edited by book is divided into sections that deal with 'Molecu- Thomas J. Wydrzynski and Kimiyuki Satoh. lar Architecture', 'Pigment-Protein Interactions', 'Ex- The realization that two independent photochemi- citation Dynamics and Electron Transfer Processes', cal reactions are required in oxygenic photosynthesis 'Modi?cation of the Cofactors', 'Spectroscopic St- came about through a series of biophysical observa- ies of the Cofactors', 'Kinetics of Electron Transfer', tions, particularly with the discovery of the Enhance- 'Biosynthetic Processes', 'Modeling of Photosystem ment Effect in oxygen evolution by Robert Emerson I Reactions', 'Related Processes', and 'Evolution of in 1957 that culminated in the codi?cation of the Photosystem I'.