2:40 PM
() Chair's Introduction. (Abstract )

2:50 PM
(S7A-1) Structural and oxidation state changes of the PSII manganese complex in its S-state cycle identified by XAFS at 20 K and at room temperature. (Abstract 132)
Holger Dau^*,1, Michael Haumann¹, Claudia Mueller¹, Peter Liebisch¹, Markus Grabolle¹, Marcos Barra¹, Thomas Neisius⁷, Wolfram Meyer-Klaucke⁸, ¹ Free Univ. Berlin, D-14185 Berlin, Germany⁷ ESRF, BP. 220, 38043 Grenoble cedex, France⁸ EMBL Outstation Hamburg, Notkestr. 85, D-22603 Hamburg, Germany

3:20 PM
(S7A-2) The mechanism of photosynthetic water oxidation in the light of new structural information. (Abstract 133)
James McEvoy^*,1, Gary Brudvig¹, ¹ Department of Chemistry, New Haven, CT, USA

3:40 PM
(S7A-3) Functional and structural properties of oxygen-evoling complex in D1 C-terminal mutants. (Abstract 134)
Naoki Mizusawa^*,1, Yukihiro Kimura¹, Asako Ishii¹, Toshihiro Yamanari², Shigeaki Nakazawa¹, Haruhiko Teramoto¹, Taka-aki Ono¹, ¹ Laboratory for Photo-Biology (I), Photodynamics Research Center, RIKEN, 519-1399 Aoba, Sendai 980-0845, Japan² Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan

4:00 PM
(S7A-4) Substrates of Photosynthetic Water Oxidation. (Abstract 135)
Warwick Hillier^*,1, Iain McConnell¹, Johannes Messinger³, Charles Dismukes⁴, Tom Wydrzynski¹, ¹ Photobioenergetics Group, Canberra, ACT, Australia³ Max-Planck Institute for Bioinorganic Chemistry, Mülheim an der Ruhr, D-45470, Germany⁴ Hoyt Laboratory, Princeton, New Jersey, USA

4:20 PM
(S7A-5) Photosynthetic water oxidation driven backward. (Abstract 136)
Jürgen Clausen¹, Wolfgang Junge^*,2, ¹ Biophysik, Universität Osnabrück, Osnabrück, Germany² Biophysik, Universität Osnabrück, Osnabrück, Germany