1. Centre of Biology, Geosciences and Environmental Education, Faculty of Education, University of West Bohemia in Pilsen, Plzen, Czech Republic
2. Department of Anthropology, Faculty of Arts, University of West Bohemia in Pilsen, Plzen, Czech Republic
3. Department of Applied Geoinformatics and Spatial Planning, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic
4. Department of Biochemistry and Microbiology, Faculty of Food and Biochemical Technology, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
5. Department of Chemistry and Chemistry Education, Faculty of Education, Charles University, Prague 1, Czech Republic