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Turing Incompleteness of Asynchronous P Systems with Active Membranes
(Fénix Editora, 2013)
We prove that asynchronous P systems with active membranes without divi- sion rules can be simulated by place/transition Petri nets, and hence are computationally weaker than Turing machines. This result holds even if ...
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Universal P Systems: One Catalyst Can Be Suficient
(Fénix Editora, 2013)
Whether P systems with only one catalyst can already be universal, is still an open problem. Here we establish universality (computational completeness) by using speci c variants of additional control mechanisms. At each ...
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Studying the Chlorophyll Fluorescence in Cyanobacteria with Membrane Computing Techniques
(Fénix Editora, 2013)
In this paper, we report a pioneer study of the decrease in chlorophyll uorescence produced by the reduction of MTT (a dimethyl thiazolyl diphenyl tetrazolium salt) monitored using an epi uorescence microscope coupled ...
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Improving Universality Results on Parallel Enzymatic Numerical P Systems
(Fénix Editora, 2013)
We improve previously known universality results on enzymatic numerical P systems (EN P systems, for short) working in all-parallel and one-parallel modes. By using a attening technique, we rst show that any EN P ...
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Scenario Based P Systems
(Fénix Editora, 2013)
In this paper we de ne and study Scenario Based P Systems, a model of computation inspired by the metabolic pathways and networks. Starting from the classical de nition of P systems with symbol objects and multiset ...
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The "Catalytic Borderline" Between Universality and Non-Universality of P Systems
(Fénix Editora, 2013)
P systems are computing models inspired by the structure and the function- ing of the living cells; they are the basic computing devices of membrane computing, a branch of natural computing. The present note is an overview ...
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On Controlled P Systems
(Fénix Editora, 2013)
We introduce and brie y investigate P systems with controlled computations. First, P systems with label restricted transitions are considered (in each step, all rules used have either the same label, or, possibly, the ...
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Continuous Versus Discrete: Some Topics with a Regard to Membrane Computing
(Fénix Editora, 2013)
Some questions and open problems are formulated in the context of a dilemma continuous approach versus discrete approach to the investigations of dynamics of complex biological and physical systems with a regard to ...
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Some Open Problems about Numerical P Systems
(Fénix Editora, 2013)
Some open problems and research topics related to numerical P systems are formulated { also recalling the problems from the corresponding section of the \mega- paper produced for the previous BWMC