Unconventional Computation (vol. # 4135) : 5th International Conference UC 2006 York UK September 4 8 2006 Proceedings Invited Papers Graph Machines and Their Applications to Computer Aided Drug Design: A New Approach to Learning from Structured Data Rational Models of Cognitive Control Fault Tolerance in Biochemical Systems Optical Computing and Computational Complexity Regular Papers If a Tree Casts a Shadow Is It Telling the Time Peptide Computing – Universality and Theoretical Model Handling Markov Chains with Membrane Computing Approximation Classes for Real Number Optimization Problems Physical Systems as Constructive Logics On Spiking Neural P Systems and Partially Blind Counter Machines Chemical Information Processing Devices Constructed Using a Nonlinear Medium with Controlled Excitability Flexible Versus Rigid Tile Assembly On Pure Catalytic P Systems Mapping Non conventional Extensions of Genetic Programming The Number of Orbits of Periodic Box Ball Systems The Euclid Abstract Machine: Trisection of the Angle and the Halting Problem 1 f Noise in Elementary Cellular Automaton Rule 110 A Light Based Device for Solving the Hamiltonian Path Problem Optimizing Potential Information Transfer with Self referential Memory On the Power of Bio Turing Machines Ergodic Dynamics for Large Scale Distributed Robot Systems.