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Locked up! A novel self-powered, reusable biofuel cell (BFC) based biocomputing security system mimicking a keypad lock device using enzyme-based concatenated AND logic gates has been developed (see figure; FFD=fructan beta-fructosidase, INV=invertase, GOD=glucose oxidase, URE=urease).
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Zhou et al. (2010) studied this question.
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