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  2. Sedimentation coefficient - Wikipedia

    en.wikipedia.org/wiki/Sedimentation_coefficient

    The sedimentation coefficient is typically dependent on the concentration of the solute (i.e. a macromolecular solute such as a protein). Despite 80+ years of study, there is not yet a consensus on the way to perfectly model this relationship while also taking into account all possible non-ideal terms to account for the diverse possible sizes, shapes, and densities of molecular solutes. [2]

  3. Svedberg - Wikipedia

    en.wikipedia.org/wiki/Svedberg

    A laboratory ultracentrifuge. In chemistry, a Svedberg unit or svedberg (symbol S, sometimes Sv [a]) is a non-SI metric unit for sedimentation coefficients.The Svedberg unit offers a measure of a particle's size indirectly based on its sedimentation rate under acceleration (i.e. how fast a particle of given size and shape settles out of suspension). [1]

  4. Clearing factor - Wikipedia

    en.wikipedia.org/wiki/Clearing_factor

    It can be used to estimate the time (in hours) required for sedimentation of a fraction with a known sedimentation coefficient (in svedbergs): t = k s {\displaystyle t={\frac {k}{s}}} The value of the clearing factor depends on the maximum angular velocity ω {\displaystyle \omega } of a centrifuge (in rad/s) and the minimum and maximum radius ...

  5. Lamm equation - Wikipedia

    en.wikipedia.org/wiki/Lamm_equation

    The first and second terms on the right-hand side of the Lamm equation are proportional to D and sω 2, respectively, and describe the competing processes of diffusion and sedimentation. Whereas sedimentation seeks to concentrate the solute near the outer radius of the cell, diffusion seeks to equalize the solute concentration throughout the cell.

  6. Differential centrifugation - Wikipedia

    en.wikipedia.org/wiki/Differential_centrifugation

    Sedimentation depends on mass, shape, and partial specific volume of a macromolecule, as well as solvent density, rotor size and rate of rotation. The sedimentation velocity can be monitored during the experiment to calculate molecular weight. Values of sedimentation coefficient (S) can be calculated. Large values of S (faster sedimentation ...

  7. Mason–Weaver equation - Wikipedia

    en.wikipedia.org/wiki/Mason–Weaver_equation

    where t is the time, c is the solute concentration (moles per unit length in the z-direction), and the parameters D, s, and g represent the solute diffusion constant, sedimentation coefficient and the (presumed constant) acceleration of gravity, respectively. The Mason–Weaver equation is complemented by the boundary conditions

  8. Particle-size distribution - Wikipedia

    en.wikipedia.org/wiki/Particle-size_distribution

    Sedimentation time is longest for the finest particles, so this technique is useful for sizes below 10 μm, but sub-micrometer particles cannot be reliably measured due to the effects of Brownian motion. Typical apparatus disperses the sample in liquid, then measures the density of the column at timed intervals.

  9. Analytical ultracentrifugation - Wikipedia

    en.wikipedia.org/wiki/Analytical_ultracentrifugation

    The simplest measurement to be obtained is the sedimentation coefficient, which depends upon the size of the molecules being sedimented. This is the ratio of a particle's sedimentation velocity to the applied acceleration causing the sedimentation.