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11 Result(s)

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  1. No Access

    Chapter and Conference Paper

    An EPR and ENDOR Spectroscopic Investigation of the Ca2+-Depleted Oxygen-Evolving Complex of Photosystem II

    Multifrequency EPR and 55Mn ENDOR spectroscopy were used to characterize the S2 ′ state of the Ca2+- depleted oxygen-evolving complex. The 55Mn ENDOR spectrum of the S2 ′ state is ...

    Thomas Lohmiller, Nicholas Cox, Jihu Su… in Photosynthesis Research for Food, Fuel and… (2013)

  2. No Access

    Chapter and Conference Paper

    Structure of the Photosynthetic Mn4Ca Cluster Using X-ray Spectroscopy

    Single crystals of Photosystem II (PSII) isolated from thermophilic cyanobacteria have been studied by X-ray diffraction (XRD) with resolutions between 3 and 3.8 Å (Ferreira et al. 2004; Loll et al. 2005). The...

    Junko Yano, Jan Kern, Kenneth Sauer, Yulia Pushkar… in Photosynthesis. Energy from the Sun (2008)

  3. No Access

    Chapter and Conference Paper

    Effects of Chloride/Bromide Substitution on Substrate Water Exchange Rates in Photosystem II

    The role of chloride in photosynthetic water oxidation is still under discussion since both its precise function and possible binding site are unresolved. In the present study the effects of Cl− on substrate wate...

    Katrin Beckmann, Naoko Ishida, Alain Boussac… in Photosynthesis. Energy from the Sun (2008)

  4. No Access

    Chapter and Conference Paper

    Oxygen Evolving Reactions by Synthetic Manganese Complexes

    Four manganese complexes were screened for O2 formation under coherent experimental conditions. We identified several new oxygen evolving reactions and in one case 18O labelling with the expected isotope ratio in...

    Stenbjörn Styring, Katrin Beckmann, Gustav Berggren… in Photosynthesis. Energy from the Sun (2008)

  5. No Access

    Chapter and Conference Paper

    Formate-Induced Release of Carbon Dioxide/ Hydrogencarbonate from Photosystem II

    Using Membrane-Inlet Mass Spectrometry (Mims) We Confirm That Injections Of High Concentrations (100 Mm Final Concentration) Of Formate Into The Psii Samples Induce A Slow Release Of Carbon Dioxide/Hydrogencar...

    Dmitriy Shevela, Vyacheslav Klimov… in Photosynthesis. Energy from the Sun (2008)

  6. No Access

    Chapter and Conference Paper

    Substrate Water Bound to the S2-State of the Mn4OxCa Cluster in Photosystem II Studied by Advanced Pulse EPR Spectroscopy

    In The Present Study, We Employed Several Advanced Pulse Epr Techniques To Detect Weak Hyperfine Couplings To Study Substrate Water Binding To The Mn4OXCa Cluster In The S2, State Of Photosystem Ii. Our Data Show...

    Ji-Hu Su, Wolfgang Lubitz, Johannes Messinger in Photosynthesis. Energy from the Sun (2008)

  7. No Access

    Chapter and Conference Paper

    Electronic Structure and Oxidation State Changes in the Mn4Ca Cluster of Photosystem II

    Oxygen-evolving complex (Mn4Ca cluster) of Photosystem II cycles through five intermediate states (Si-states, i = 0–4) before a molecule of dioxygen is released. During the Sstate transitions, electrons are extra...

    Junko Yano, Yulia Pushkar, Johannes Messinger… in Photosynthesis. Energy from the Sun (2008)

  8. No Access

    Chapter

    Mechanism of Photosynthetic Oxygen Production

    This chapter deals with the mechanism of photosynthetic water oxidation that leads to O2 formation in Photosystem II (PS II). After a brief introduction to the structure and function of the PS II complex, the S-s...

    Warwick Hillier, Johannes Messinger in Photosystem II (2005)

  9. No Access

    Chapter

    Refined Model of the Oxidation States and Structures of the Mn/Ca/Cl Cluster of the Oxygen Evolving Complex of Photosystem II

    Central to the problem of photosynthetic oxygen evolution is the structure and function of the Mn/Ca/Cl complex that appears to be the locus of charge accumulation and water splitting. In the recent past our g...

    Roehl M. Cinco, Carmen Fernandez… in Photosynthesis: Mechanisms and Effects (1998)

  10. No Access

    Chapter

    Substrate Water 18O Exchange Kinetics in the S2 State of Photosystem II

    The oxidation of water into molecular oxygen during photosynthesis is catalyzed by a subdomain of photosystem II (PSII) termed the water oxidizing complex (WOC). Contained within the WOC is a redox-active Mn/t...

    Warwick Hillier, Johannes Messinger… in Photosynthesis: Mechanisms and Effects (1998)

  11. No Access

    Chapter

    Calcium and Chloride Cofactors of the Oxygen Evolving Complex - X-Ray Absorption Spectroscopy Evidence for A Mn/Ca/Cl Heteronuclear Cluster

    The oxygen-evolving complex (OEC) of photosystem II (PSII) in green plants and algae contains a cluster of four Mn atoms in the active site, which catalyzes the oxidation of water to dioxygen. Along with Mn, Cl− ...

    Carmen Fernandez, Roehl M. Cinco, John H. Robblee… in Photosynthesis: Mechanisms and Effects (1998)