Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 16: Laser Developments and Applications
Q 16.7: Talk
Monday, March 11, 2019, 15:30–15:45, S SR 211 Maschb.
Counting magnetotactic bacteria with a combination of microfluidics and optically pumped magnetometers — •Tino Fremberg, Volkmar Schultze, Florian Wittkämper, Mark Kielpinski, and Ronny Stolz — Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
Magnetotactic bacteria (MTB) are aquatic bacteria with the ability to grow single domain magnets, so called magnetosomes, inside their bodies. They contribute significantly to the microbiotic biomass of our planet and are involved in environmental cycles of iron, sulfur, nitrogen and carbon. After death the MTB remain magnetic, so they can be used as markers for archeogeomagnetics and archeology. In order to learn more about their abundance and distribution on planet Earth, we want to examine water samples via automated single detection by means of microfluidics (MF) and optically pumped magnetometers (OPM). As the MTB’s magnetic moment is very small (10-15 Am2) and the resulting magnetic field drops with third power of distance, a detector with a small size in close proximity to the MTB is required.
Currently, a new vapor cell design is under examination with regard to fabrication and sensitivity. It features a tube with 100 µm outer diameter to transport the MTBs directly through the alkali vapor and shall enable measuring within a distance of 50 - 100 µm from the MTB.