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A new approach to the theory of linear dichroism in partially ordered systems. Application to reaction centers and whole cells of photosynthetic bacteria Public Deposited

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  • ABSTRACT We have developed a new approach to the theory of linear dichroism in partially ordered systems. The description of the partially ordered ensemble uses a density of states function, D(θ, ϕ, Δ), which gives the probability that the direction of polarization for incident polarized light has spherical angles θ and ϕ in an axis system fixed with respect to the molecule; Δ = (Δₜ, Δ₂ ... Δₙ.) is a set of parameters that describes the partial ordering. We derive new formulas for linear dichroism using the density of states function and then apply these formulas to the analysis of linear dichroism in reaction centers and whole cells of photosynthetic bacteria. One advantage of our approach is that the order parameter, Δ, provides a more complete description of the distribution function than the traditional order parameters used by other authors. Knowledge of Δ gives a good physical description of the partial ordering and allows one to calculate accurate limits for the range of possible orientations of the transition moments.
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  • Nairn, J. A., Friesner, R., Frank, H. A., & Sauer, K. (1980). A new approach to the theory of linear dichroism in partially ordered systems. application to reaction centers and whole cells of photosynthetic bacteria. Biophysical Journal, 32(2), 733-753. doi:10.1016/S0006-3495(80)85013-2
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  • This work was supported, in part, by the Biomedical and Environmental Research Division of the U.S. Department ofEnergy under contract No. 2-7405-ENG-48 and, in part, by National Science Foundation grant PCM 76-5074. J. A.Nairn was supported by a University of California Regents Fellowship, and Dr. Frank was supported by apostdoctoral fellowship from the National Institutes of Health.
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  • The published article is copyrighted by The Biophysical Society and published by Cell Press/Elsevier.
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