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Biology subjects

Ayres, P.

Publications and source records attributed to Ayres, P..

2 recordsLinked to original sources

Exploring Discrete Space-Time Models for Information Transfer: Analogies from Mycelial Networks to the Cosmic Web

Fungal mycelium networks are large scale biological networks along which nutrients, metabolites flow. Recently, we discovered a rich spectrum of electrical activity in mycelium networks, including action-potential spikes and trains of spikes. Reasoning by analogy with animals and plants, where travelling patterns of electrical activity perform integrative and communicative mechanisms, we speculated that waves of electrical activity transfer information in mycelium networks. Using a new discrete space-time model with emergent radial spanning-tree topology, hypothetically comparable mycelial morphology and physically comparable information transfer, we provide physical arguments for the use of such a model, and by considering growing mycelium network by analogy with growing network of matter in the cosmic web, we develop mathematical models and theoretical concepts to characterise the parameters of the information transfer.

bioinformatics↗

Tuning electrical spiking of Schizophyllum commune with light

When studying the split-gill fungus Schizophyllum commune, we observed that the growing colonies displayed endogenous spikes of electrical potential similar to the action potentials of neurons. In order to investigate the impact of light on the electrical activities of these colonies, we exposed them to intermittent stimulation with cold light (5800k) and later with blue (c. 470nm), red (c. 642nm) and green (c. 538nm) light. Our findings revealed spiking activity can be influenced using this input including observable responses with patterns of spiking at relatively high average amplitudes (>1mV) appearing consistently upon illumination of the sample. The response is likely related to the activity of fungal photoreceptors, including potential sensitisation to blue light in the cellular signalling pathways facilitated by white collar proteins (WC-1, WC-2) in S. commune. Based on these findings, we suggest that fungal photosensors and photonic computing substrates have the potential to enable applications beyond the scope of conventional electronics via relatively fast spiking responses to light tuned by external input stimulation. Further work should focus on identifying the signal transduction pathway for responses to different wavelengths of light and its role in translation into engineered ELMs to extend existing studies in fungal photobiology.

bioengineering↗