Essential elements, harmful elements, naturally occurring ligands, chelating ligands, ligands used in chelate therapy, functions of metals, principles of bioinorganic coordination chemistry, template effect, spontaneous self-assembly, properties of biological molecules, transport of metal ions, control and utilization of metal-ion concentrations, DNA binding, enzymes exploiting acid catalysis, developing artificial hydrolytic metalloenzymes, zinc fingers, electron transfer and energy sources for life, iron-sulfur proteins, Mossbauer spectroscopy, hydrogenases, nitrogenase, atom and group transfer chemistry, redox enzymes, biomineralization, metals in medicine, radiopharmaceuticals.