Figure 1.

Experimental design schematic diagram. Serial dilutions of M. magneticum cultures grown in revised MSGM were assessed. Aliquots from dilutions between 10^–4 until 10^–10 were used for DNA extraction and PCR amplification (a). In parallel, aliquots were visually examined with HDT and optical microscopy (b). M. magneticum cells responded via taxis towards a magnet’s magnetic field. The microphotograph shows a cell of M. magneticum swimming towards the magnet's south pole at a dilution 10^–8 (×100 objective).