Mem-fractive Properties of Mushrooms
Résumé
Memristors close the loop for I-V characteristics of the traditional, passive, semi-conductor devices.
Originally proposed in 1971, the hunt for the memristor has been going ever since. The key feature of
a memristor is that its current resistance is a function of its previous resistance and the current passed
through it. As such, the behaviour of the device is in
uenced by changing the way in which potential
is applied across it. Ultimately, information can be encoded on memristors. Biological substrates have
already been shown to exhibit some memristive properties. By extension, the mem-capacitor and mem-
inductor have been proposed. Such devices change either their capacitive or inductive properties a function
of the previous voltage, similar to memristors. A device that exhibits combinations of memristors, mem-
capacitors and mem-inductors is termed a mem-fractive device. However, many passive memory devices
are yet to be found. Here we show that the fruit bodies of grey oyster fungi Pleurotus ostreatus exhibit
encouraging behaviour in the eld of organic memory devices. This paper presents the I-V characteristics
of the mushrooms. By examination of the conducted current for a given voltage applied as a function of
the previous voltage, it is shown that the mushroom exhibits the properties of a mem-fractor. Our results
demonstrate that nature continues to provide specimens that hold these unique and valuable electrical
characteristics and which have the potential to advance the eld of hybrid electronic systems.
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