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Magnetic Fields

Magnetic Fields

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...

Magnetic Field Lines

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

Cell-matrix's Response to Mechanical Forces

Cell-matrix's Response to Mechanical Forces

In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...

Divergence and Curl of Magnetic Field

Divergence and Curl of Magnetic Field

The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:

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Related Experiment Video

Updated: Jul 18, 2026

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Published on: May 9, 2016

Flow and magnetic field induced collagen alignment.

Cheng Guo¹, Laura J Kaufman

¹Department of Chemistry, Columbia University, New York, NY 10027, USA.

|November 23, 2006

Summary

This study introduces a simple, specialized-equipment-free method for aligning collagen gels using magnetic beads. This technique enables precise control over collagen fiber orientation for various applications.

Area of Science:

Biomaterials Science
Tissue Engineering
Biophysics

Background:

Collagen gel alignment is crucial for mimicking native tissue structures.
Existing alignment techniques often require specialized and costly equipment.
A need exists for accessible and straightforward collagen gel alignment methods.

Purpose of the Study:

To present a novel, equipment-free technique for aligning collagen gels using magnetic beads.
To quantitatively assess the degree of collagen alignment achieved.
To elucidate the mechanism underlying magnetic bead-induced collagen alignment.

Main Methods:

Utilizing surface-modified magnetic beads (streptavidin-coated) and an external magnet to align collagen.
Employing confocal reflectance microscopy for imaging collagen gel structure.

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Last Updated: Jul 18, 2026

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Published on: May 9, 2016

Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment

Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment

Published on: September 7, 2022

Production of Nanofibrillar Patterned Collagen for Tissue Engineering

Production of Nanofibrillar Patterned Collagen for Tissue Engineering

Published on: September 20, 2024

Applying image analysis techniques to quantify fiber position and angular distribution.

Conducting rheology experiments to understand gel mechanics during alignment.

Main Results:

A straightforward collagen gel alignment technique was developed, requiring only basic laboratory materials.
Streptavidin-coated magnetic beads demonstrated superior alignment efficiency.
Alignment mechanism involves bead coupling to, and entrapment within, assembling collagen fibrils.
Successful alignment was achieved in millimeter-thick plain and cell-bearing collagen gels.

Conclusions:

The presented magnetic bead-based method offers an accessible and effective approach for collagen gel alignment.
This technique eliminates the need for specialized equipment, broadening its applicability.
The findings provide insights into the physical interactions governing collagen self-assembly and alignment.
The method is suitable for creating aligned collagen scaffolds for tissue engineering and research applications.