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. Author manuscript; available in PMC: 2017 Dec 16.
Published in final edited form as: Faraday Discuss. 2016 Dec 16;194:621–638. doi: 10.1039/c6fd00084c

Figure 3.

Figure 3

Center: The Kok S-state cycle for water oxidation by PSII. Gray - donor side: Each of the four photons absorbed by the PS II P680 reaction center, oxidizes the tyrosine Yz intermediate, which in turn oxidizes the Mn4CaO5 complex. Blue - acceptor side: QA and QB are reduced on the acceptor side. Left Top: A best case steady state S-state population as a function of laser-flash illuminations. 10% miss hit is assumed. Insets: The evolution of the populations of the S-states as a function of time are shown after 0 flashes (0F), 1 flash (1F) and 2 flashes (2F).21–23