Journal ArticleDOI
Comparison of theories for the translational and rotational diffusion coefficients of rod‐like macromolecules. Application to short DNA fragments
TLDR
In this paper, the translational and rotational diffusion coefficients of a rod-like macromolecule were compared with the Tirado-Garcia de la Torre theory for a particle of given dimensions.Abstract:
Two theories relating the translational and rotational diffusion coefficients Dt and Dr of a rod‐like macromolecule to its length and diameter, proposed by Broersma [J. Chem. Phys. 74, 6989 (1981)], and Tirado and Garcia de la Torre [J. Chem. Phys. 71, 2581 (1979); 73, 1986 (1980)] are shown to predict different values of the coefficients for a particle of given dimensions. Next, we use the two theories to analyze existing experimental data of sedimentation coefficients s and translational and rotational diffusion coefficients of short DNA fragments, and obtain values of the hydrated diameter of DNA d which is treated as an adjustable parameter. The results are compared with the expected value, d≂26A. This comparison favors clearly the Tirado–Garcia de la Torre theory in the case of Dt and s. For Dr, and using a rise per base pair r=3.4 A, this theory gives best agreement for all the data examined, while when r=3.3 A, the agreement depends on the source of data.read more
Citations
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Physics of microswimmers--single particle motion and collective behavior: a review.
TL;DR: The physics of locomotion of biological and synthetic microswimmers, and the collective behavior of their assemblies, are reviewed and the hydrodynamic aspects of swimming are addressed.
Journal ArticleDOI
Physics of Microswimmers - Single Particle Motion and Collective Behavior
TL;DR: In this article, the authors review the physics of locomotion of biological and synthetic microswimmers, and the collective behavior of their assemblies, including synchronization and the concerted beating of flagella and cilia.
Journal ArticleDOI
Meso-scale turbulence in living fluids
Henricus H. Wensink,Jörn Dunkel,Sebastian Heidenreich,Knut Drescher,Knut Drescher,Raymond E. Goldstein,Hartmut Löwen,Julia M. Yeomans +7 more
TL;DR: In this paper, the authors combine experiments, particle simulations, and continuum theory to identify the statistical properties of self-sustained meso-scale turbulence in active systems, and propose a minimal continuum model for incompressible bacterial flow.
Journal ArticleDOI
Dynamic Light Scattering Measurement of Nanometer Particles in Liquids
TL;DR: In this article, a review of DLS techniques for studying sizes and shapes of nanoparticles in liquids is presented. But the authors focus on the time fluctuations in the intensity of light scattered by the particle dispersion.
Journal ArticleDOI
Making Sense of Brownian Motion: Colloid Characterization by Dynamic Light Scattering
TL;DR: This historical review of dynamic light scattering discusses the basic principle, data analysis, and important precautions to be taken while analyzing colloids using DLS in a manner that can be understood by a beginner.
References
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Book
Low Reynolds number hydrodynamics
John Happel,Howard Brenner +1 more
TL;DR: Low Reynolds number flow theory finds wide application in such diverse fields as sedimentation, fluidization, particle-size classification, dust and mist collection, filtration, centrifugation, polymer and suspension rheology, and a host of other disciplines.
Journal ArticleDOI
Hydrodynamic properties of complex, rigid, biological macromolecules: theory and applications.
TL;DR: In this paper, the translational and rotational brownian dynamics of dissolved macromolecules were analyzed using quasielastic light scattering, transient electric birefringence and fluorescence anisotropy decay.
Journal ArticleDOI
Rotational Diffusion Constant of a Cylindrical Particle
TL;DR: In this paper, the rotational diffusion constant of a closed cylinder rotating in a viscous medium has been calculated for length (2a) over width (2b) ratios larger than 3.5 to within a first order in b/a.
Book
Physical chemistry of nucleic acids
TL;DR: This work has used bulk and single-molecule measurements of thermodynamics and kinetics, plus various spectroscopic methods (UV absorption, optical rotation, circular dichroism, circular intensity differential scattering, fluorescence, NMR) to approach this goal.