# Actin droplet machine

## TL;DR

This paper introduces a computer model of an actin droplet network that processes binary information through traveling excitations, potentially serving as a basis for future biopolymer-based parallel computing systems.

## Contribution

It presents a novel design and analysis of an actin droplet machine capable of implementing binary string mappings and state transitions for biopolymer computing.

## Key findings

- The actin droplet network can generate and record impulses as binary responses.
- The machine's state transitions can be mapped and analyzed through graph models.
- Potential application as an elementary processor in biopolymer-based parallel computers.

## Abstract

The actin droplet machine is a computer model of a three-dimensional network of actin bundles developed in a droplet of a physiological solution, which implements mappings of sets of binary strings. The actin bundle network is conductive to travelling excitations, i.e. impulses. The machine is interfaced with an arbitrary selected set of k electrodes through which stimuli, binary strings of length k represented by impulses generated on the electrodes, are applied and responses are recorded. The responses are recorded in a form of impulses and then converted to binary strings. The machine's state is a binary string of length k: if there is an impulse recorded on the $i$th electrode, there is a `1' in the i-th position of the string, and `0' otherwise. We present a design of the machine and analyse its state transition graphs. We envisage that actin droplet machines could form an elementary processor of future massive parallel computers made from biopolymers.