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.