(P6A-1) Temperature dependence of fluorescence induction in Photosystem II core complexes from Thermosynechococcus elongatus. (Abstract 313)
Frank Müh^*,, Eberhard Schlodder,

(P6A-2) The reaction center associated triheme cytochrome of Rhodovulum sulfidophilum, structural analysis and evolutionary aspects. (Abstract 314)
Jean Alric^{*,1, 4}, Yusuke Tsukatani², Makoto Yoshida², Katsumi Matsuura², Keizo Shimada², Wolfgang Nitschke³, Kenji Nagashima², André Verméglio⁴, ¹ Laboratoire de Génétique et Biophysique des Plantes, Marseille, France⁴ CEA-Cadarache DSV-DEVM Laboratoire de Bioénergétique Cellulaire, Saint Paul lez Durance, France² Department of Biology, Tokyo, Japan³ Laboratoire de Bioénergétique et Ingéniérie des Protéines UPR 9036, Marseille, France

(P6A-3) On the role of the CP47 core antenna in the energy transfer and trapping dynamics of Photosystem II. (Abstract 315)
Elena Andrizhiyevskaya^*,1, Dmitrij Frolov¹, Rienk van Grondelle¹, Jan Dekker¹, ¹ FEW/N&S/BCS, Amsterdam, The Netherlands

(P6A-4) Electron transfer in the reaction center of Rb. sphaeroides R-26 studied by transient absorption. (Abstract 316)
Marcin Ziolek, Natalia Wereszczynska, Ryszard Naskrecki, Andrzej Dobek^*,,

(P6A-5) Influence of the outer antenna on the photochemical trapping rate in PSII of barley thylakoids. (Abstract 317)
Enrico Engelmann^*,1, Giuseppe Zucchelli¹, Anna Paola Casazza¹, Flavio Garlaschi¹, Robert Jennings, ¹ Dipartimento di Biologia, Milano, MI, Italy

(P6A-6) Bicarbonate stabilizes Photosystem II steady-state electron transport to artificial acceptors in Spirulina maxima intact filaments. (Abstract 318)
Javier Fernandez-Velasco^*,1, Joel Freeman¹, Amanda Harms¹, G. Charles Dismukes², Tom Wydrzynski¹, ¹ Research School of Biological Sciences, Canberra, ACT, Australia²

(P6A-7) Magnetic field dependent singlet oxygen production in a biological system. (Abstract 319)
Yan Liu^*,1, Ruth Edge¹, Kevin Henbest², Christiane Timmel², Peter Hore², Peter Gast¹, ¹ Department of Biophysics, Leiden, The Netherlands² Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford, UK

(P6A-8) Long living charge separated state of photosynthetic reaction centers reconstituted in negatively charged proteoliposomes. (Abstract 320)
Livia Giotta^*,1, Angela Agostiano^{2, 3}, Francesco Milano³, Massimo Trotta³, ¹ Dipartimento di Scienza dei Materiali, Lecce, Italy² Dipartimento di Chimica, Bari, Italy³ Istituto per i Processi Chimico-Fisici, Bari, Italy

(P6A-9) The manganese complex of oxygenic photosynthesis studied by time-resolved X-ray absorption spectroscopy at room temperature. (Abstract 321)
Michael Haumann^*,1, Claudia Mueller¹, Peter Liebisch¹, Thomas Neisius², Holger Dau¹, ¹ Freie Universitaet Berlin, Physik, Arnimallee 14, 14195 Berlin, Germany² ESRF, BP. 220, 38043 Grenoble, Cedex, France

(P6A-10) Absence of the psbH gene product destabilizes photosystem II complex in Thermosynechococcus elongatus BP-1. (Abstract 322)
MASAKO IWAI-OGURO^*,1, MITSUNORI KATAYAMA², YASUNORI INOUE¹, MASAHIKO IKEUCHI², ¹ Department of Applied Biological Science, Faculty of Science and Technology, Noda, Chiba, Japan² Department of Life Sciences (Biology), Meguro, Tokyo, Japan

(P6A-11) Functional analysis of the PsbP-like protein (SLL1418) in Synechocystissp. PCC 6803. (Abstract 323)
Yasuo Ishikawa^*,1, Wolfgang Schröder¹, Christiane Funk¹, ¹ Department of Biochemistry and Umeĺ Plant Science Center, Umeĺ University, Sweden

(P6A-12) Functional analysis of psbX deletion mutant in Synechocystis sp. PCC6803. (Abstract 324)
Hiroyuki Koike^*,1, Masashi Taniguchi¹, Kazuhiko Satoh¹, ¹ Department of Life Science, Graduate School of Life Science, University of Hyogo, Koto, Hyogo, Japan

(P6A-13) Carotenoid singlet excited state energy transfer mechanism in purple bacterial reaction centers. (Abstract 325)
Su Lin^*,1, Evaldas Katilius¹, Hadi Tabbara¹, Robielyn Ilagan², George Gibson³, Harry Frank², Neal Woodbury¹, ¹ Department of Chemistry & Biochemistry, Tempe, AZ, USA² Department of Chemistry, University of Connecticut, Storrs, CT, USA³ Department of Physics, University of Connecticut, Storrs, CT, USA

(P6A-14) Optimization of power conversion efficiency by photosynthetic reaction centers. (Abstract 326)
Marcell Marosvolgyi^*,1, Hans van Gorkom¹, ¹ Department of Biophysics, Leiden University, Leiden, Z-Holland, Netherlands

(P6A-15) Probing the pH changes associated with RC photocycle in detergent and proteoliposomes by fluorescence techniques. (Abstract 327)
Francesco Milano^*,1, Angela Agostiano^{1, 2}, Livia Giotta³, László Nagy⁴, Péter Maróti⁴, Massimo Trotta ¹, ¹ Istituto per i Processi Chimico-Fisici – Sezione di Bari, Bari, Italy² Dipartimento di Chimica, Bari, Italy³ Dipartimento Scienza dei Materiali, Lecce, Italy⁴ Department of Biophysics, Szeged, Hungary

(P6A-16) Primary charge separation in reaction center is unique in Photosystem II, unistep from accessory chlorophylls by superexchange virtual mediation of P₆₈₀. (Abstract 328)
Koichiro Mukai^*,1, Keisuke Saito¹, Hitoshi Sumi¹, ¹ Tennou-dai 1-1-1, Tsukuba, Ibaraki, Japan

(P6A-17) 2D-HYSCORE spectroscopic evaluation of spin dinsity distributions of redox-active tyrosine radicals in Photosystem II. (Abstract 329)
Shigeaki Nakazawa^*,1, Asako Ishii¹, Jun Minagawa², Taka-aki Ono¹, ¹ Laboratory for Photo-Biology(1), Sendai, Miyagi, Japan² The Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan

(P6A-18) Prediction of inelastic electron tunneling mechanism from bacteriopheophytin to the primary quinone in modified bacterial photosynthetic reaction centers. (Abstract 330)
Hirotaka Nishioka^*,1, Tsutomu Kawatsu², Akihiro Kimura¹, Takahisa Yamato¹, Toshiaki Kakitani³, ¹ Department of Physics, Nagoya, Aichi, Japan² Department of Chemistry, Durham, North Carolina, USA³ Faculty of Science and Technology, Nagoya, Aichi, Japan

(P6A-19) Identifying spectral signatures from key cofactors of Photosystem II and the Cytochrome b₆f complex using low-temperature polarization spectroscopies. (Abstract 331)
Sindra Peterson Ĺrsköld^{*,1, 6}, Jörgen Ström², Rafael Picorel³, Michael Seibert³, Jian-Ren Shen⁴, Paul Smith⁵, Ronald Pace⁵, Elmars Krausz⁶, ¹ Dept. of Biochemistry, Lund, Sweden⁶ Research School of Chemistry, Canberra, ACT, Australia² Dept. of Plant Cell Biology, Lund, Sweden³ National Renewable Energy Laboratories, Golden, Co, USA⁴ RIKEN Harima Institute, Hyogo, Japan⁵ Faculties of Science, Dept. of Chemistry, Canberra, ACT, Australia

(P6A20) EPR and absorption spectroscopy studies of the primary donor cation radical in heterodimer mutant reaction centers of Blastochloris viridis. (Abstract 332)
Nina Ponomarenko^*,1, Oleg Poluektov², Agnes Ostafin³, Richard Baxter¹, Edward Bylina⁴, James Norris¹, ¹ Department of Chemistry, Chicago, IL, USA² Chemistry department, Argonne, IL, USA³ Department of Chemical Engineering, Notre Dame, IN, USA⁴

(P6A-21) EPR and absorption spectroscopy studies of the primary donor cation radical in heterodimer mutant reaction centers of Blastochloris viridis. (Abstract 333)
Shipra Prakash^*,1, Els Schulten¹, A Alia¹, Peter Gast², Jan Raap¹, Johan Lugtenburg¹, Huub de Groot¹, Joerg Matysik¹, ¹ Leiden Institute of Chemistry, Leiden, The Netherlands² Department of Biophysics, Leiden, The Netherlands

(P6A-22) Theory of optical spectra of Photosystem II reaction centers: From structure to function. (Abstract 334)
Thomas Renger^*,1, Grzegorz Raszewski¹, Wolfram Saenger¹, ¹ Freie Universität Berlin, Institut für Chemie, Berlin, Germany

(P6A-23) Substitution of chlorophyll into the inactive branch pheophytin-binding site impairs charge separation in Photosystem II. (Abstract 335)
Ling Xiong¹, Seibert Michael², Michael WASIELEWSKI³, Craig Hemann⁴, C. Russ Hille⁴, Richard Sayre^*,1, ¹ Department of Plant Cellular and Molecular Biology, Columbus, Ohio, USA² 2National Renewable Energy Laboratory, Golden, Colorado, USA³ Department of Chemistry, Evanston, Illinois, USA⁴ Department of Molecular and Cellular Biochemistry, Columbus, Ohio, USA

(P6A-24) Altered charge transfer yield in Photosystem II D1-E130-pheophytin mutants. (Abstract 336)
Ling Xiong¹, Haether Johnston², Michael Seibert³, Michael Wasielewski⁴, Terry Gustafson², Richard Sayre^*,1, ¹ Department of Plant Cellular and Molecualr Biology, Columbus, Ohio, USA² Department of Chemistry, Columbus, Ohio, USA³ National Renewable Energy Lab, Golden, Colorado, USA⁴ Department of Chemistry, Evanston, Illinois, USA

(P6A-25) Mechanism of charge separation and stabilization of separated charges in native and mutant reaction centers of Rhodobacter sphaeroides excited by 20-fs pulses at 90 K. (Abstract 337)
Andrey Yakovlev¹, Ludmila Vasilieva², Anatoly Shkuropatov², Michael Jones³, Vladimir Shuvalov^{*,1, 2}, ¹ Department of Photobiophysics, Belozersky Institute of Chemical and Physical of Moscow State University, Moscow, Russia² Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow region, Russia³ Dept. of Biochemistry, School of Medical Sciences, Univ. of Bristol, Bristol, UK

(P6A-26) Turnover studies using visible and far red light on PSII core samples from higher plants. (Abstract 338)
Paul Smith^*,1, Joseph Hughes², Barry Prince², Elmars Krausz², Sindra Peterson-Arskold³, Ronald Pace¹, ¹ Department of Chemistry, Canberra, ACT, Australia² Research School of Chemistry, Australia³ Research School of Chemistry, Australia

(P6A-27) Identification of a requirement for the PsbQ-like protein in Synechocystis sp. PCC 6803. (Abstract 339)
Tina Summerfield^*,1, Jackie Shand¹, Fiona Bentley¹, Julian Eaton-Rye¹, ¹ Department of Biochemistry, Dunedin, New Zealand

(P6A-29) Resonance raman spectroscopy of chlorophyll d and -carotene. (Abstract 340)
Alison Telfer^*,1, Min Chen², Bruno Robert³, Andrew Pascal³, ¹ Imperial College London, London, UK² School of Biological Sciences, Sydney, Australia³ SBFM, Gif-sur-Yvette, France

(P6A-30) Femtosecond time-resolved fluorescence of reaction center complex containing Zn-bacteriochlorophyll a purified from Acidiphilium rubrum . (Abstract 341)
Tetsuo Tomii^*,1, Yutaka Shibata¹, Yuuki Ikeda¹, Seiji Taniguchi², Chosrowjan Haik², Noboru Mataga², Keizo Shimada³, Shigeru Itoh¹, ¹ Graduate school of science, Nagoya City, Chikusa, Japan² Institute for Laser Technology, Amagasaki City, Japan³ Graduate school of sciece, Hachiouji City, Japan

(P6A-31) Kinetic properties of the secondary electron transfer pathways in Photosystem II. (Abstract 342)
Cara Tracewell^*,1, Gary Brudvig¹, ¹ Department of Chemistry, New Haven, CT, USA

(P6A-32) Protein/lipid interaction in bacterial photosynthetic reaction center: The role of phosphatidylcholine and phosphatidylglycerol in charge stabilization. (Abstract 343)
Massimo Trotta^*,1, Francesco Milano¹, Angela Agostiano^{1, 2}, Livia Giotta³, László Nagy⁴, György Váró⁵, Gábor Laczkó⁴, Péter Maróti⁴, ¹ Istituto Processi Chimico Fisici - Sezione di Bari, BARI, ITALY² Department of Chemistry, Bari, ITALY³ Dipartimento di Scienza dei Materiali, Lecce, ITALY⁴ Department of Biophysics, Szeged, Hungary⁵ Institute of Biophysics, Hungary

(P6A-33) Localisation of the accumulated chlorophyll cation in the Photosystem II reaction centre. (Abstract 344)
Frantisek Vacha^*,1, Jakub Psencik^{2, 3}, Milan Durchan^{1, 3}, Mirek Dusin⁴, ¹ Institute of Plant Molecular Biology ASCR, Ceske Budejovice, Czech Republic² Faculty of Mathematics and Physics, UK, Praha, Czech Republic³ Institute of Physical Biology, Nove Hrady, Czech Republic⁴ Institute of Rychle Sipy, Praha, Czech Republic

(P6A-34) Effects of the steric exclusion of the HB bacteriopheophytin from the Rhodobacter sphaeroides reaction centre. (Abstract 345)
Ashley Watson^*,1, Paul Fyfe¹, Marion Wakeham¹, Eliane Nabedryk², Dmitrij Frolov³, Rienk van Grondelle³, Jacques Breton², Michael Jones¹, ¹ Department of Biochemistry, School of Medical Sciences, Bristol, UK² Service de Bioénergétique, France³ Department of Physics and Astronomy, Amsterdam, The Netherlands

(P6A-35) A combined D1 (PsbA) and CP47 (PsbB) mutagenesis system in Synechocystis sp. PCC 6803. (Abstract 346)
Regan Winter^*,1, William Nicoll¹, Julian Eaton-Rye¹, ¹ Department of Biochemistry, Dunedin, New Zealand

(P6A-36) Temperature dependence of photo-CIDNP in photosynthetic reaction centres. (Abstract 7347)
Eugenio Daviso^*,1, S. Prakash¹, A. Alia¹, P. Gast², H de Groot¹, G. Jeschke³, J. Matysik¹, ¹ Leiden Institute of Chemistry, Leiden, The Netherlands² Leiden Institute of Physics, Leiden, The Netherlands³ Max-Planck-Institut für Polymerforschung, Mainz, Germany