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.