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A magnetosome chain viewed as a bio-elastic magnet
Ariel G Meyra1, Guillermo J Zarragoicoechea, Victor A Kuz
1IFLYSIB, 59 789, La Plata, Argentina. vasco@iflysib.unlp.edu.ar.
Physical Chemistry Chemical Physics : PCCP
|April 22, 2016
Summary
Magnetotactic bacteria use magnetosome chains for orientation. Simulations reveal these chains store elastic energy and form twisted structures due to electric dipoles in their lipid shells.
Area of Science:
- Biophysics
- Microbiology
- Computational Science
Background:
- Magnetotactic bacteria possess chains of magnetic nanoparticles called magnetosomes.
- These chains act as a compass, enabling bacterial orientation in the Earth's geomagnetic field.
- Each magnetosome is a magnetic nanocrystal within a lipid shell, modeled with magnetic and electric dipoles.
Purpose of the Study:
- To analyze magnetosome chain stability using coarse-grained Monte Carlo simulations.
- To explore the influence of model parameters on chain formation and stability.
- To investigate the role of electric dipoles in magnetosome chain structure.
Main Methods:
- Coarse-grained Monte Carlo numerical simulations.
- Modeling magnetosomes as hard cores with embedded magnetic dipoles and mobile electric dipoles.
- Varying control parameters to observe chain arrangements.
Main Results:
- Magnetic particles form linear clusters without lipid coating.
- Electric dipoles in the coating lead to linear but twisted magnetosome chains.
- A perfectly linear and straight chain was not observed in 3D simulations, consistent with biological systems lacking filament proteins.
- Stability and magnetization of a 30-bead chain were analyzed.
Conclusions:
- Magnetosome chains are crucial for bacterial orientation.
- The presence of electric dipoles influences chain structure, leading to twists.
- Magnetosome chains may function as storage for elastic energy, in addition to orientation.
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