Anomalous Diffusion

Anomalous Diffusion

Typically, in a diffusion process, the mean squared displacement (msd) of a particle is a linear function of time. Anomalous diffusion is used to describe a diffusion process with a non-linear dependence on time.

Diffusion is often described by a power law, msd(t) ~ Dtα, where D is the diffusion coefficient and t is the elapsed time. In a typical diffusion process, α = 1. If α > 1, the phenomenon is called superdiffusion. Superdiffusion can be the result of active cellular transport processes. If α < 1, the particle undergoes subdiffusion. Subdiffusion has been proposed as a measure of macromolecular crowding in the cytoplasm.

References

*Avi Caspi, Rony Granek, and Michael Elbaum. "Diffusion and directed motion in cellular transport." Physical Review E 66, 011916 (2002)
*Matthias Weiss, Markus Elsner, Fredrik Kartberg, and Tommy Nilsson. "Anomalous Subdiffusion Is a Measure for Cytoplasmic Crowding in Living Cells." Biophysical Journal 87 : 3518-3524 (2004)


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Diffusion — This article is about the generic concept of the time dependent random process. For other uses, see Diffusion (disambiguation). Diffusion describes the spread of particles through random motion from regions of higher concentration to regions of… …   Wikipedia

  • Diffusion anomale — En diffraction de rayons X, la diffusion anomale ou diffusion résonante est un phénomène qui apparaît lorsque l énergie des rayons X incidents est proche d une arête d absorption d un atome du cristal. Les photons incidents sont alors absorbés et …   Wikipédia en Français

  • Diffusion — Modellhafte Darstellung der Durchmischung zweier Stoffe durch Diffusion Diffusion (v. lateinisch diffundere ‚ausgießen‘, ‚verstreuen‘, ‚ausbreiten‘) ist ein physikalischer Prozess, der zu einer gleichmäßigen Verteilung von Teilchen und somit …   Deutsch Wikipedia

  • Diffusion (Naturwissenschaft) — Modellhafte Darstellung der Durchmischung zweier Stoffe durch Diffusion Diffusion (v. lat.: diffundere „ausgießen, verstreuen, ausbreiten“) ist ein physikalischer Prozess, der zu einer gleichmäßigen Verteilung von Teilchen und somit zur… …   Deutsch Wikipedia

  • anomalous scatter — anomalioji sklaida statusas T sritis fizika atitikmenys: angl. anomalous scatter vok. anomale Streuung, f rus. аномальное рассеяние, n pranc. diffusion anormale, f …   Fizikos terminų žodynas

  • diffusion anormale — anomalioji sklaida statusas T sritis fizika atitikmenys: angl. anomalous scatter vok. anomale Streuung, f rus. аномальное рассеяние, n pranc. diffusion anormale, f …   Fizikos terminų žodynas

  • Bohm diffusion — is the diffusion of plasma across a magnetic field with a diffusion coefficient equal to:D {Bohm} = frac{1}{16},frac{k BT}{eB},where B is the magnetic field strength, T is the temperature, and e is the elementary charge.It was first observed in… …   Wikipedia

  • Molecular diffusion — This article is about spontaneous dispersion of mass. For a more generic treatment of diffusion, see Diffusion. Diffusion from a microscopic and macroscopic point of view. Initially, there are solute molecules on the left side of a barrier… …   Wikipedia

  • Fluorescence correlation spectroscopy — (FCS) is a common technique used by physicists, chemists, and biologists to experimentally characterize the dynamics of fluorescent species (e.g. single fluorescent dye molecules in nanostructured materials, autofluorescent proteins in living… …   Wikipedia

  • Dirk Brockmann — (born September 2, 1969, in Braunschweig, Germany) is a theoretical physicist working at Northwestern University, Evanston where he is Associate Professor in the Department of Engineering Sciences Applied Mathematics. He is known for his… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”