SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.27: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

The influence of storage on magnetotactic bacteria — •Imke Wellesen, Nicole Sander, and Mathias Getzlaff — Heinrich-Heine-Universität, Düsseldorf

Magnetic nanoparticles offer many new possibilities in medical applications e.g. in hyperthermia for cancer therapy. However, their production is largely challenging since it is often very complicated and costly. Therefore, the focus of research has been drawn to special organisms: Magnetotactic bacteria (MTB) naturally synthesize magnetic nanoparticles to orient themselves along the earth`s magnetic field. In the future they could be used as nanoparticle producers. A problem is the resulting dependence of the applications on the life cycles of the bacteria. Therefore, optimal storage conditions must be evaluated so that the nanoparticles may still be used effectively at all times.

In this work we investigated the influence of storage at room and low temperatures on the bacteria and nanoparticles. The bacterial growth was examined via the optical density. The progression of the optical density and magnetisation of the organisms was observed over a period of 19 days. The results showed the positive effect of low temperatures on the bacteria. Storage at room temperature resulted in exponentially decreasing optical density and the destruction of the chain structure of the nanoparticles. Optical density and magnetisation of the bacteria at low temperatures on the other hand remained constant. Thus, the experiments showed that storage of magnetotactic bacteria should be realised at lower temperatures.