Introduction to bioinorganic chemistry; introduction to homogeneous catalysis; relationships between enzymatic and heterogeneous catalysis; Lewis acid properties of zinc and its development to phosphotriester detoxifying agents; vanadiumhaloperoxidases; molybdenum and tungsten enzymes; catalysis by nitrogenases and synthetic analogues; biological iron-sulfur clusters with catalytic activity; catalysis by nickel in biological systems; oxygen activation at Nonheme iron centres; dioxygenactivation at Heme centres in enzymes and synthetic analogues; biological and biomimetric catalysis of manganese redox enzymes and their inorganic models; the two B12 cofactors - influence of the trans nitrogen ligand on homolytic and heterolyticprocesses; formation, structure, and reactivity of copper dioxygen complexes; multielectron transfer and catalytic mechanisms in oxidative polymerization; metalloenzymes with a quinone cofactor; future developments.