Free-energy change accompanying the reduction of the reaction center secondary quinone in Rhodopseudomonas sphaeroides chromatophores期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Free-energy change accompanying the reduction of the reaction center secondary quinone in Rhodopseudomonas sphaeroides chromatophores

Affiliation:	1. Department of Chemical Sciences, University of Padova, Via Marzolo, 1, 35131, Padova, Italy;2. Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 370 05 Ceske Budejovice, Czech Republic;3. Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, 16802, USA;4. Department of Chemistry, The Pennsylvania State University, University Park, 16802, USA;5. Department of Chemistry, Brock University, 1812 Sir Isaac Brock, Way, St. Catharines, ON L2S 3A1, Canada

Abstract:	The standard free-energy change accompanying the electron transfer from Q_A to Q_B was estimated from the intensity of the delayed fluorescence in chromatophores of Rhodopseudomonas sphaeroides. The value of 120 meV (at pH 8) suggests that Q_B⁻ is more stable in the chromatophore membrane than in the isolated reaction center.

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