Invited Papers -- Recognizable Sets of Graphs, Hypergraphs and Relational Structures: A Survey -- Some New Directions and Questions in Parameterized Complexity -- Basic Notions of Reaction Systems -- A Kleene Theorem for a Class of Communicating Automata with Effective Algorithms -- Algebraic and Topological Models for DNA Recombinant Processes -- Contributed Papers -- Regular Expressions for T…