New research shows bacteria can use tiny magnetic particles to effectively create a 'natural battery.' According to work published in journal Science on 27 March, the bacteria can load electrons onto and discharge electrons from microscopic particles of magnetite. This discovery holds out the potential of using this mechanism to help clean up environmental pollution, and other bioengineering applications. According to study leader Dr James Byrne (Tübingen): "The geochemistry is interesting in itself, but there are also potentially useful implications which may derive form this work. The flow of electrons is critical to the existence of all life and the fact that magnetite can be considered to be redox active opens up the possibility of bacteria being able to exist or survive in environments where other redox active compounds are in short supply in comparison to magnetite. In our study we only looked at iron metabolizing bacteria, but we speculate that it might be possible for other non-iron metabolizing organisms to use magnetite as a battery as well -- or if they can be made to use it, through genetic engineering. But this is something that we do not know yet." Co-author, Andreas Kappler (Tübingen), who is also secretary of the European Association of Geochemistry, said: "This may have some interesting geochemical applications. There has been considerable recent work on using magnetite to clean up toxic metals. For example, magnetite can reduce the toxic form of chromium, chromium VI, to the less toxic chromium (III), which can then be incorporated into a magnetite crystal. The fact that this magnetite may then be exposed to these reducing bacteria could potentially enhance its remediation capacity. But we are still at an early stage of understanding the bioengineering implications of this discovery."