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Related Concept Videos

Other Unique Bacteria01:18

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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Ferromagnetism01:31

Ferromagnetism

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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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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Magnetic Field Lines01:19

Magnetic Field Lines

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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:
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Magnetite Crystal Orientation in Magnetosome Chains.

André Körnig1, Michael Winklhofer2, Jens Baumgartner1

  • 1Department of Biomaterials, Max Planck Institute of Colloids and Interfaces Science Park Golm, 14424, Potsdam, Germany.

Advanced Functional Materials
|April 14, 2015
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Summary

Magnetotactic bacteria form chains of magnetic crystals. Synchrotron X-ray diffraction reveals specific crystallographic orientations within these chains, influenced by biological control or magnetic interactions.

Keywords:
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Area of Science:

  • Biophysics
  • Materials Science
  • Microbiology

Background:

  • One-dimensional magnetic nanostructures exhibit enhanced magnetic properties due to uniaxial shape anisotropy.
  • Magnetosome chains in magnetotactic bacteria are biological examples of organized magnetic nanomaterials.
  • Magnetite crystals are synthesized within organelles called magnetosomes and arranged linearly.

Purpose of the Study:

  • To determine the crystallographic orientation of magnetosomes within chains in magnetotactic bacteria.
  • To investigate the relationship between crystal orientation, chain axis, and bacterial strain.
  • To explore the factors influencing magnetosome chain texture.

Main Methods:

  • Cells of magnetotactic bacteria were pre-aligned using a magnetic field.
  • Two-dimensional synchrotron X-ray diffraction (XRD) was employed to analyze magnetosome orientation.
  • Pole figure patterns were generated to reveal crystallographic textures.

Main Results:

  • A [111] fiber texture along the chain direction was observed for magnetospirilla strains MSR-1 and AMB-1.
  • A [100] fiber texture was measured for Desulfovibrio magneticus strain RS-1.
  • The [100] axis, typically a magnetic hard axis, becomes an effective easy axis with particle elongation (aspect ratio > 1.25), consistent with RS-1 magnetosome morphology.

Conclusions:

  • Pronounced fiber textures in magnetosome chains suggest either strain-specific biological control over crystal orientation or physical alignment via magnetic interactions.
  • Biological control of crystal elongation axis can sufficiently influence the overall crystallographic texture of the magnetosome chain.