Search Results - (Author, Cooperation:P. J. O'Malley)
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1Latest Papers from Table of Contents or Articles in PressP. Roushan ; C. Neill ; Y. Chen ; M. Kolodrubetz ; C. Quintana ; N. Leung ; M. Fang ; R. Barends ; B. Campbell ; Z. Chen ; B. Chiaro ; A. Dunsworth ; E. Jeffrey ; J. Kelly ; A. Megrant ; J. Mutus ; P. J. O'Malley ; D. Sank ; A. Vainsencher ; J. Wenner ; T. White ; A. Polkovnikov ; A. N. Cleland ; J. M. Martinis
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-11-14Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressJ. Kelly ; R. Barends ; A. G. Fowler ; A. Megrant ; E. Jeffrey ; T. C. White ; D. Sank ; J. Y. Mutus ; B. Campbell ; Y. Chen ; Z. Chen ; B. Chiaro ; A. Dunsworth ; I. C. Hoi ; C. Neill ; P. J. O'Malley ; C. Quintana ; P. Roushan ; A. Vainsencher ; J. Wenner ; A. N. Cleland ; J. M. Martinis
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-03-06Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Articles: DFG German National LicensesStaff View
ISSN: 1573-5079Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract The early suggestion by Lozier and Butler (Photochem. Photobiol. 17, 133–137 (1973)) that EPR Signal II arises from radicals associated with the water-splitting process in PSII has been confirmed and extended over the intervening years. Recent work has identified the Signal II radicals, $$\begin{array}{*{20}c} {\mathop D\nolimits^{\begin{array}{*{20}c} + \\ . \\ \end{array} } } \\ \end{array}$$ and $$\begin{array}{*{20}c} {\mathop Z\nolimits^{\begin{array}{*{20}c} + \\ . \\ \end{array} } } \\ \end{array}$$ , with plastosemiquinone cation species. In the experiments presented here we have used ENDOR spectroscopy and D2O/H2O exchange to characterize these paramagnets in more detail. The ENDOR matrix region, which arises from protons which interact weakly with the unpaired electron spin, is well-resolved at 4 K and at least seven resonances are apparent. A number of hyperfine couplings in the 3–8 MHz range are observed and are suggested to arise from methyl or hydroxyl protons which occur as substituents on the plastosemiquinone cation ring or from amino acid protons hydrogen-bonded to the 1,4-hydroxyl groups. Orientation selection experiments are consistent with these possibilities. D2O/H2O exchange shows that the D+/Z+ site is accessible to solvent. However, the exchange occurs slowly and is not complete even after 72 hours which suggests that the free radicals are functionally isolated from solvent water.Type of Medium: Electronic ResourceURL: