<?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%">Adam Obtulowicz</style></author><author><style face="normal" font="default" size="100%">Gheorghe Paun</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">(In search of) probabilistic P systems </style></title><secondary-title><style face="normal" font="default" size="100%">Biosystems</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Biochemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Membrane computing</style></keyword><keyword><style  face="normal" font="default" size="100%">Probability</style></keyword><keyword><style  face="normal" font="default" size="100%">Turing computability</style></keyword><keyword><style  face="normal" font="default" size="100%">Universality</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ingentaconnect.com/content/els/03032647/2003/00000070/00000002/art00034</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Elsevier</style></publisher><pub-location><style face="normal" font="default" size="100%">San Diego, CA, USA</style></pub-location><volume><style face="normal" font="default" size="100%">70</style></volume><pages><style face="normal" font="default" size="100%">107-121</style></pages><abstract><style face="normal" font="default" size="100%">The aim of this paper is to (preliminarily) discuss various ways of introducing probabilities in membrane systems. We briefly present both ideas already circulated in the literature and new proposals, trying to have a systematic overview of possibilities of associating probabilities with the ingredients of a membrane system: with (localization of) single objects, with multiplicities of objects (hence with the multisets), with the rules (depending or not on the previous applied rule), with the communication targets. For a certain mode of using the probabilities associated with the evolution rules (in string-object P systems) we obtain the computational universality.

</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue></record></records></xml>