Invited Papers.- Impacts of Membrane Computing on Theoretical Computer Science.- Time and Space Complexity of P Systems - And Why They Matter.- A Brute-Force Solution to the 27-Queens Puzzle Using a Distributed Computation.- Regular Papers. -Tissue P Systems with Point Mutation Rules.- Adaptive P Systems.- Chain Code P System Generating a Variant of the Peano Space-filling Curve.- APCol Systems with Agent Creation.- APCol Systems with Verifier Agents.- A Semantic Investigation of Spiking Neural P Systems.- Towards Automated Analysis of Belousov-Zhabotinsky Reactions in a Petri Dish by Membrane Computing using Optic Flow.- Testing Identifiable Kernel P Systems using an X-machine Approach.- Actor-like cP Systems.- Solving QSAT in Sublinear Depth.- Design of specific P systems simulators on GPUs.- Construction of Stable and Lightweight Technical Structures Inspired by Ossification of Bones using Osteogenetic P Systems.- On Small Universality of Spiking Neural P Systems with Multiple Channels.- Modeling Plant Development with M Systems.- An Improved Quicksort Algorithm Based on Tissue-Like P Systems with Promoters.