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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

6.5K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Magnetic Force01:18

Magnetic Force

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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Biot-Savart Law: Problem-Solving00:59

Biot-Savart Law: Problem-Solving

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The magnitude and direction of a magnetic field created by a steady current can be calculated using the Biot-Savart law.
Consider a mobile phone battery bank as a source of steady current, which flows through the wire connected between the two. What is the magnitude of the magnetic field created by this current at a field point P?
To estimate the magnitude of the total magnetic field, we first consider a small current element of length dl, at a distance r from the field point. Now the following...
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Updated: Nov 1, 2025

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
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Magnetic Forces Enable Control of Biological Processes In Vivo.

Gang Bao1

  • 1Department of Bioengineering, Rice University, Houston, TX 77030.

Journal of Applied Mechanics
|June 25, 2021
PubMed
Summary
This summary is machine-generated.

Magnetic iron oxide nanoparticles (MIONs) leverage magnetic fields for biological control. These nanomagnets enable targeted drug delivery and enhanced gene editing for diverse biomedical applications.

Keywords:
micromechanics

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Biophysics

Background:

  • Magnetic fields exert significant biological effects, influencing processes from navigation (magnetoreception) to neural activity modulation via heating.
  • Magnetic iron oxide nanoparticles (MIONs) are unique nanomaterials that respond to external magnetic fields, offering imaging contrast and energy transfer capabilities.

Purpose of the Study:

  • To review the utilization of magnetic forces from MIONs for controlling biological processes.
  • To highlight the distinct advantages of MIONs in biomedical applications due to their magnetic properties.

Main Methods:

  • Utilizing magnetic forces generated by MIONs under applied magnetic fields.
  • Describing approaches for controlling biological functions, including drug targeting and delivery.
  • Exploring the spatial control of gene editing using MIONs and viral vectors.

Main Results:

  • MIONs enable precise control over biological processes through magnetic field interactions.
  • Applications include targeted drug delivery by increasing vessel permeability.
  • Spatial control of in vivo genome editing is achievable via MION-activated viral vectors.

Conclusions:

  • MIONs offer unique opportunities for precise control of biological systems via magnetic fields.
  • Their dual functionality (imaging and energy transfer) distinguishes them for advanced biomedical applications.
  • Nanomagnets hold significant promise for a wide array of future medical interventions.