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Other Unique Bacteria

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Updated: Nov 11, 2025

Synthesis of Immunotargeted Magneto-plasmonic Nanoclusters
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Magnetic Nanoparticles.

San Kyeong1, Jaehi Kim2, Hyejin Chang3

  • 1School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea.

Advances in Experimental Medicine and Biology
|March 30, 2021
PubMed
Summary
This summary is machine-generated.

Magnetic nanoparticles offer unique properties for applications in data storage and biomedicine. Their low toxicity is driving increased use in biological fields, with recent research trends explored.

Keywords:
Drug deliveryMRIMagnetic nanoparticlesSeparationSuperparamagnetism

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Magnetic nanoparticles (MNPs) possess unique magnetic properties utilized across diverse fields.
  • Their low toxicity enhances their significance, particularly in biological and biomedical applications.
  • Nanotechnology offers advanced solutions for scientific and medical challenges.

Purpose of the Study:

  • To introduce fundamental concepts of nanotechnology for scientific inquirers and undergraduates.
  • To cover recent research trends and advancements in the field of nanotechnology.
  • To highlight the growing importance of magnetic nanoparticles in biological applications.

Main Methods:

  • Review of foundational nanotechnology principles.
  • Synthesis and characterization of magnetic nanoparticles.
  • Analysis of current research literature on nanotechnology trends.

Main Results:

  • Established a baseline understanding of nanotechnology principles.
  • Identified key research directions and emerging trends in nanotechnology.
  • Demonstrated the expanding role of magnetic nanoparticles in biomedicine due to their properties and low toxicity.

Conclusions:

  • Magnetic nanoparticles are versatile materials with increasing biomedical relevance.
  • Nanotechnology education should encompass both fundamental knowledge and current research.
  • Further exploration of MNP applications in biology and medicine is warranted.