X-machines were introduced by S. Eilenberg in 1974 ([Eil74]) as a mathematical framework for examining the relationships between languages and automata. The X-machine definition provided a very general concept that captured in a simple and elegant way a wide variety of existing models and their computational behaviour. Thus finite state machines, pushdown automata and Turing machines all provided different examples of X-machines obtained by varying some of the components of the X-machine's definition.

What are X-Machines?

The principle philosophy for the authors' work is the representation of some aspects of cellular metabolism as the computation of suitably defined data. The main benefit is the opportunity to make use of some of the theoretical models of general, concurrent computing systems in the hope that the computational models may enlighten the biochemical theory; and the analysis of successful parallel biochemical systems may enlighten the theory of parallel computing.<
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Computational models of cellular information systems

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Computational models of cellular information systems