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Related Concept Videos

Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Microtubules01:35

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There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.
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Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
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Related Experiment Video

Updated: Jan 6, 2026

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy
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Simulation of electric fields generated from microtubule vibrations.

Kyle A Thackston1, Dimitri D Deheyn2, Daniel F Sievenpiper1

  • 1Electrical Engineering Department, University of California, San Diego, California 92093, USA.

Physical Review. E
|October 3, 2019
PubMed
Summary

Vibrating microtubules generate electric fields. These fields can exert significant forces on nearby biological molecules, potentially influencing cellular processes like mitosis and cell communication.

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Area of Science:

  • Cellular Biophysics
  • Cytoskeletal Dynamics

Background:

  • Microtubules are key cytoskeletal components in eukaryotic cells.
  • Their mechanical properties suggest potential for high-frequency vibrations.
  • Electrically polar microtubules vibrating could generate intracellular electric fields.

Purpose of the Study:

  • To simulate electric fields from vibrating microtubules.
  • To evaluate the biological significance of these electric fields.
  • To assess potential energy interactions between microtubules.

Main Methods:

  • Utilized a transient simulation method.
  • Investigated electric field generation from single microtubules.
  • Analyzed previously unstudied vibrational modes.

Main Results:

  • The acoustic branch flexing mode is the most electrically active.
  • Vibrating microtubules can exert forces exceeding thermal energy on biological dipoles/charges.
  • Significant forces are exerted within ~10nm (Debye length) of the microtubule surface.

Conclusions:

  • Simulated electric fields from vibrating microtubules have biological relevance.
  • Microtubule vibrations may play a role in organizing mitosis or cell communication.
  • Interactions are significant at short ranges but unlikely at greater distances.