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Membrane Computing is an emergent branch of Natural Computing introduced by G. Paun. This new model of computation starts from the assumption that the processes taking place in the compartmental structure of a living cell can be interpreted as computations. The devices of this model are called P systems. Roughly speaking, a P system consists of a cell-like membrane structure, in the compartments of which one places multisets of objects which evolve according to given rules.
Most variants of membrane systems have been proved to be computationally complete, that is equivalent in power to Turing machines, and computationally efficient, that is able to solve
computationally hard problems in polynomial time. Although most research in P systems concentrates on computational powers, lately they have been used to model biological phenomena.
As P systems are inspired from the structure and functioning of the living cell, it is natural to consider them as modelling tools for b