Invited Lectures.- ?P Systems and Typed ?-Calculus.- P Automata.- Asynchronous P Systems and P Systems Working in the Sequential Mode.- Evolution and Oscillation in P Systems: Applications to Biological Phenomena.- An Approach to Computational Complexity in Membrane Computing.- LMNtal: A Language Model with Links and Membranes.- Regular Presentations.- Executable Specifications of P Systems.- On the Efficiency of P Systems with Active Membranes and Two Polarizations.- Communicative P Systems with Minimal Cooperation.- Ultimately Confluent Rewriting Systems. Parallel Multiset-Rewriting with Permitting or Forbidding Contexts.- Unstable P Systems: Applications to Linguistics.- A P System Description of the Sodium-Potassium Pump.- Inhibiting/De-inhibiting Rules in P Systems.- Time-Independent P Systems.- On Two-Dimensional Mesh Networks and Their Simulation with P Systems.- Exploring Computation Trees Associated with P Systems.- Approximating Non-discrete P Systems.- Reducing the Size of Extended Gemmating P Systems.- P Systems Generating Trees.- On Descriptive Complexity of P Systems.- P Systems with Symport/Antiport: The Traces of RBCs.- Conservative Computations in Energy-Based P Systems.- General Multi-fuzzy Sets and Fuzzy Membrane Systems.- Trading Polarization for Bi-stable Catalysts in P Systems with Active Membranes.- Modelling Dynamic Organization of Biology-Inspired Multi-agent Systems with Communicating X-Machines and Population P Systems.- On the Size of P Systems with Minimal Symport/Antiport.