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Related Concept Videos

Electric Field01:16

Electric Field

Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
Electric Field Lines01:25

Electric Field Lines

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.
The solution to this problem is to use electric field lines, which are not vectors but...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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...
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
Induced Electric Fields01:23

Induced Electric Fields

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Related Experiment Video

Updated: May 11, 2026

Quantification of Acanthamoeba spp. Motility
07:33

Quantification of Acanthamoeba spp. Motility

Published on: September 20, 2024

Acanthamoeba migration in an electric field.

Jolene Chang Rudell1, Jing Gao, Yuxin Sun

  • 1Department of Dermatology, Institute for Regenerative Cures, School of Medicine, University of California at Davis, Davis, California, USA.

Investigative Ophthalmology & Visual Science
|May 30, 2013
PubMed
Summary
This summary is machine-generated.

Acanthamoeba trophozoites exhibit directed migration in response to electric fields (EFs). This directedness is voltage-dependent, suggesting potential new treatments for Acanthamoeba keratitis.

Keywords:
Acanthamoebadirectional cell migrationelectric fields

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Electric Field-controlled Directed Migration of Neural Progenitor Cells in 2D and 3D Environments
11:15

Electric Field-controlled Directed Migration of Neural Progenitor Cells in 2D and 3D Environments

Published on: February 16, 2012

Area of Science:

  • Cell Biology
  • Biophysics
  • Microbiology

Background:

  • Acanthamoeba are protozoan parasites.
  • Acanthamoeba keratitis is a serious eye infection.
  • The response of Acanthamoeba trophozoites to external stimuli is of clinical interest.

Purpose of the Study:

  • To investigate the in vitro response of Acanthamoeba trophozoites to electric fields (EFs).
  • To determine if electric fields can influence Acanthamoeba trophozoite migration patterns.

Main Methods:

  • Acanthamoeba castellanii exposed to varying strengths of electric fields.
  • Cell migration monitored using microscopy and time-lapse imaging.
  • Migration analyzed and quantified using ImageJ software in 2D and 3D culture systems.

Main Results:

  • Acanthamoeba trophozoites migrate randomly without an EF.
  • Trophozoites exhibit significantly directed migration in response to EFs (P < 0.001).
  • Migration directionality is voltage-dependent, increasing with higher applied voltage.

Conclusions:

  • Acanthamoeba trophozoites demonstrate directed movement in response to EFs in both 2D and 3D cultures.
  • The voltage-dependent nature of this response offers potential for novel therapeutic strategies.
  • Electric field application may present new treatment modalities for Acanthamoeba keratitis.