Abstract
We describe a relatively inexpensive and effective method for collecting magnetotactic bacteria (MTB) from the field. This protocol relies on the use of simple magnets. A clear plastic container can be used to collect sediment and water from a natural source, such as a freshwater pond. In the Northern hemisphere, the south end of a bar magnet is placed against the outside of the container just above the sediment at the sediment-water interface. After some time, the bacteria can be removed from the inside of the container near the magnet with a pipette and then enriched further by using a capillary racetrack and a magnet. In the racetrack, a sterile cotton plug is used to separate magnetic versus non-magnetic cells as the MTB swim through the cotton towards a magnet placed at the opposite end of the racetrack. Once enriched, the presence of MTB can be confirmed by using the hanging drop method and a light microscope to observe MTB swimming in response to the north or south end of a bar magnet. Higher resolution can be obtained by depositing a drop of enriched MTB onto a copper grid and observing the microorganisms with transmission electron microscopy (TEM). Using this method, isolated MTB may be studied microscopically to determine characteristics such as swimming behavior, type and number of flagella, cell morphology, shape of the magnetic crystals, number of magnetosomes, number of magnetosome chains in each cell, composition of the crystals, and presence of intracellular vacuoles.
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Oestreicher, Z., Lower, S.K., Bazylinski, D.A., Lower, B.H. (2015). Collection and Enrichment of Magnetotactic Bacteria from the Environment. In: Saffarini, D. (eds) Bacteria-Metal Interactions. Springer, Cham. https://doi.org/10.1007/978-3-319-18570-5_3
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