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Microbial Computing Using Geobacter Biofilm Electrodes:
Output Stability and Consistency
John Greenman, Ioannis Ieropoulos, Colin McKenzie and Chris Melhuish

The direction of our work is towards a proof of concept of a novel biological processing unit and a new paradigm of computation based on neurone-like and transistor-like behaviour in the same units. This paper describes a non accumulating, steady state microbial biofilm that can be constantly monitored using electrodes. Experimental bio- film units have been constructed and produced steady-state current output readings over the whole experimental period of 4 weeks. Changing the external electrical load (resistor) resulted in a new steady state at a different level of electrical output than the original. Transition times between steady-states were relatively short (

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