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- W2023552686 abstract "An Exact theoretical expression for the apparent diffusion coefficient Dapp(K) of a thin rigid rod with arbitrary anisotropy of its translational diffusion diffusion coefficient is derived from the first cumulant of its dynamic structure factor. Dapp(K) is predicted to reach a limiting plateau value at extermely large values of KL, where K is the scattering vector and L the rod length. Howerver, that limiting plateau value is approached only very slowly along a quasi-plateau with a very gradual slope. Dynamic light-scattering studies have been performed on tobacco mosaic virus from K2 = (0.4–20) × 1010 cm−2 using 632-8-nm laser radiation. The present data yield D0 = (4.19 ± 0.10) × 10−8 cm2/s (corrected to 20,w conditions) and, with literature data to establish L = 2980 Å and the rotational diffusion coefficient DR = 318s−1, yield also Δ ≡ D∥ − D⊥ = (1.79 ± 0.38) × 10−8 cm2/s. The experimental data closely follow the curve of Dapp(K) vs K2 calcuated for these parameters. The present value of D0 substantially exceeds all previous dynamic light-scattering values, but is in good aggreement with previous sedimentation data, which were confirmed for the presemt sample. The anisotropy ratio Δ/D0 = 0.43 ± 0.09 is in accord with theoretical predictions based on the modified Kirkwood algorithm, despite the fact the D0 lies significantly below its corresponding theoretical value. The present data largely predlude the possibility that both D0 and Δ/D0 could simultaneously match their theoretical predictions. We present a detailed comparison of the experimental data with the calculations of Tirado and Garcia de la Torre based on the modified Kirkwood algorithm and with the Broersma formulas." @default.
- W2023552686 created "2016-06-24" @default.
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- W2023552686 date "1983-03-01" @default.
- W2023552686 modified "2023-09-24" @default.
- W2023552686 title "Dynamic light scattering from thin rigid rods: Anisotropy of translational diffusion of tobacco mosaic virus" @default.
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- W2023552686 doi "https://doi.org/10.1002/bip.360220308" @default.
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