Magnetotactic bacteria are a diverse group of microorganisms which possess one or more chains of magnetosomes (containing magnetite). These bacteria are able to use the geomagnetic field for direction sensing, thus providing a simple model for the study of magnetite-based magnetoreception.
56 bacterial samples were tested (28 were exposed and 28 samples were sham-exposed).
|Exposure duration||continuous for 2 h, 4 h, 8 h, 12 h, 16 h or 24 h|
|Duty cycle||50 %|
The data showed that the cellular magnetism of the bacterial culture significantly increased while the growth of cells remained unaffected after exposure. After exposure, the number of magnetic particles per cell was increased by about 15% and slightly enhanced ratios of magnetic particles of superparamagnetic property (size <20 nm) and mature magnetosomes (size >50 nm) were found. In addition, the intracellular iron accumulation slightly increased after pulsed magnetic field exposure.
The authors conclude that 50 Hz, 2 mT pulsed magnetic field exposure affect the formation of magnetosomes in Magnetospirillum sp. strain AMB-1. The pulsed magnetic field could increase cellular magnetism and the number of magnetic particles and affected the distribution of magnetosomes.