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Fluorescence Blinking of the RC–LH1 Complex from Rhodopseudomonas palustris

Authors

  • Sarah Unterkofler,

    1. Experimental Physics IV
    2. Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth (Germany), Fax: (+49) 921 55 4002
    3. Current address: Max Planck Institute for the Science of Light, Division for Photonics and New Materials, Günther-Scharowsky-Straße 1/Bau 24, 91058 Erlangen (Germany)
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  • Tobias Pflock,

    1. Experimental Physics IV
    2. Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth (Germany), Fax: (+49) 921 55 4002
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  • June Southall,

    1. Department of Biochemistry & Molecular Biology, Faculty of Biomedical & Life Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA (UK)
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  • Prof. Dr. Richard J. Cogdell,

    1. Department of Biochemistry & Molecular Biology, Faculty of Biomedical & Life Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA (UK)
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  • Prof. Dr. Jürgen Köhler

    Corresponding author
    1. Experimental Physics IV
    2. Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth (Germany), Fax: (+49) 921 55 4002
    • Experimental Physics IV
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Abstract

We investigate fluorescence blinking of individual RC–LH1 (reaction-centre–light-harvesting 1) complexes from the photosynthetic purple bacterium Rhodopseudomonas palustris. For both the on- and off-periods the telegraph-like intermittency of the fluorescence intensity follows power-law statistics with exponents between 1 and 2. Yet, this behaviour was only observed for a small fraction of the complexes studied. We argue that the majority of the complexes reside in a prolonged on-state, due to a mechanism that is similar to the Coulomb blockade in semiconductor quantum dots, and which results here from the photoinduced charges located within the RC upon photoexcitation of the LH1 antenna.

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