Proton Pumping P Systems.- A Binary Data Structure for Membrane Processors: Connectivity Arrays.- Parsing with Active P Automata.- Universality of Minimal Symport/Antiport: Five Membranes Suffice.- Collapsing Hierarchies of Parallel Rewriting P Systems without Target Conflicts.- Evolution and Observation: A New Way to Look at Membrane Systems.- Tiling Rectangular Pictures with P Systems.- Simulating Boolean Circuits with P Systems.- P Systems Running on a Cluster of Computers.- Implementing in Prolog an Effective Cellular Solution to the Knapsack Problem.- On the Dynamics of PB Systems: A Petri Net View.- P Systems Generating Hexagonal Picture Languages.- A Membrane System for the Leukocyte Selective Recruitment.- P Systems with Cutting/Recombination Rules Assigned to Membranes.- ? -P Automata with Communication Rules.- The Number of Membranes Matters.- An Agent-Based Behavioural Model of Monomorium Pharaonis Colonies.- Can Hyperbolic Geometry Be of Help for P Systems?.- A Linear-Time Solution to the Knapsack Problem Using P Systems with Active Membranes.- A Reconfigurable Hardware Membrane System.- P Systems and Petri Nets.- Simulation of Mobile Ambients by P Systems. Part 1.- Computing Partial Recursive Functions by Transition P Systems.- P Systems with External Input and Learning Strategies.- A Distributed Simulation of Transition P Systems.- About Splicing P Systems with Immediate Communication and Non-extended Splicing P Systems.