Abstract
Mycelium-bound composites consist of discrete substrate elements joined together by filamentous hypha strands. These composites can be moulded or extruded into custom components of desired shapes. When live fungi are present these composites exhibit electrical conductivity as well as memfractive and capacitive properties. These composites might be used in nonlinear electrical circuits. We investigated the AC conductive properties of mycelium-bound composites and fungal fruit bodies at higher frequencies, spanning three overlapping frequency ranges: 20 Hz to 300 kHz, 10 Hz to 4 MHz, and 50 kHz to 3 GHz, to advance fungal electronics. Our measurements revealed that mycelium-bound composites primarily function as low-pass filters, with an average cut-off frequency of 500 kHz and a roll-off rate of \(-\)14 dB/decade. Within the pass band, the average attenuation is less than 1 dB. Fungal fruiting bodies have significantly lower mean cut-off frequencies that range from 5 Khz to 50 Khz depending on the species. Their roll-off range from \(-20\) to \(-30\) decibels per decade, with mean attenuation across the pass band less than 3 decibels. The precise mechanism underlying frequency-dependent attenuation is unclear. However, the high-water content, which is around 80 % in mycelium-bound composites and up to 92 % in fruiting bodies, is important. Because of the presence of dissolved ionizable solids, this water content is electrically conductive, making it a likely contributing factor. This research looks into the potential applications of mycelium-bound composites and fungal fruiting bodies in analog computing.
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Phillips, N., Weerasekera, R., Roberts, N., Adamatzky, A. (2023). Electrical Signal Transfer by Fungi. In: Adamatzky, A. (eds) Fungal Machines. Emergence, Complexity and Computation, vol 47. Springer, Cham. https://doi.org/10.1007/978-3-031-38336-6_16
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