<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gheorghe Paun</style></author><author><style face="normal" font="default" size="100%">Mario J. Pérez-Jiménez</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Towards bridging two cell-inspired models: P systems and R systems</style></title><secondary-title><style face="normal" font="default" size="100%">Ninth Brainstorming Week on Membrane Computing</style></secondary-title><tertiary-title><style face="normal" font="default" size="100%">Proceedings of the Ninth Brainstorming Week on Membrane Computing</style></tertiary-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year><pub-dates><date><style  face="normal" font="default" size="100%">02/2011</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.gcn.us.es/9bwmc_proceedings</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Fénix Editora</style></publisher><pub-location><style face="normal" font="default" size="100%">Seville, Spain</style></pub-location><pages><style face="normal" font="default" size="100%">305-316</style></pages><abstract><style face="normal" font="default" size="100%">We examine, from the point of view of membrane computing, the two basic
assumptions of reaction systems, the \threshold&quot; and \no permanence&quot; ones. In certain
circumstances (e.g., de¯ning the successful computations by local halting), the second
assumption can be incorporated in a transition P system or in a symport/antiport P
system without losing the universality. The case of the ¯rst postulate remains open: the
reaction systems deal, deterministically, with ¯nite sets of symbols, which is not of much
interest for computing; three ways to introduce nondeterminism are suggested and left
as research topics.</style></abstract></record></records></xml>