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Microbial Computing using Geobacter biofilm electrodes: output stability and consistency

Microbial Computing using Geobacter biofilm electrodes: output stability and consistency
Microbial Computing using Geobacter biofilm electrodes: output stability and consistency
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 biofilm 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 (<4 minutes). Switching streams of substrate also resulted in new steady-states but the transition times between steady states were of longer duration (∼ 4–5 minutes) and flow-rate dependent. Both steady-states and the transitional behaviour between steady-states were consistent and reproducible. Although envisaged to utilize non-silicon, non-binary multi-valued logic processing, a first step to understanding their behaviour may be made by the theoretical comparison with conventional binary gates such as AND, OR, NOT, NAND, NOR, XOR, and XNOR. Multiple valued systems could potentially lead to large size memories (many combinations) at low rates of speed which could be exploited in terms of parallel computing.
1548-7199
249-265
Greenman, John
eb3d9b82-7cac-4442-9301-f34884ae4a16
Ieropoulos, Ioannis
6c580270-3e08-430a-9f49-7fbe869daf13
McKenzie, C.
2587b164-5e5e-48e5-8e99-2064d68b4bdd
Melhuish, C.
b810405f-9492-42d0-b8b7-8712ab11536c
Greenman, John
eb3d9b82-7cac-4442-9301-f34884ae4a16
Ieropoulos, Ioannis
6c580270-3e08-430a-9f49-7fbe869daf13
McKenzie, C.
2587b164-5e5e-48e5-8e99-2064d68b4bdd
Melhuish, C.
b810405f-9492-42d0-b8b7-8712ab11536c

Greenman, John, Ieropoulos, Ioannis, McKenzie, C. and Melhuish, C. (2006) Microbial Computing using Geobacter biofilm electrodes: output stability and consistency. International Journal of Unconventional Computing, 2 (3), 249-265.

Record type: Article

Abstract

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 biofilm 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 (<4 minutes). Switching streams of substrate also resulted in new steady-states but the transition times between steady states were of longer duration (∼ 4–5 minutes) and flow-rate dependent. Both steady-states and the transitional behaviour between steady-states were consistent and reproducible. Although envisaged to utilize non-silicon, non-binary multi-valued logic processing, a first step to understanding their behaviour may be made by the theoretical comparison with conventional binary gates such as AND, OR, NOT, NAND, NOR, XOR, and XNOR. Multiple valued systems could potentially lead to large size memories (many combinations) at low rates of speed which could be exploited in terms of parallel computing.

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Published date: 2006

Identifiers

Local EPrints ID: 454691
URI: http://eprints.soton.ac.uk/id/eprint/454691
ISSN: 1548-7199
PURE UUID: db2b705c-07bd-459a-9806-8fde7f7f2fa4
ORCID for Ioannis Ieropoulos: ORCID iD orcid.org/0000-0002-9641-5504

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Date deposited: 21 Feb 2022 17:35
Last modified: 22 Feb 2022 02:57

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Contributors

Author: John Greenman
Author: C. McKenzie
Author: C. Melhuish

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