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Cyanobacteria are the oldest prokaryotes with worldwide distribution. Some of them are able to produce secondary metabolites (including cyanotoxins), which can have different effects on the other phytoplankton species. It is speculated that production of cyanotoxins is an adaptation mechanism of the cyanobacteria to survive in diverse habitats inhibiting the growth of the competing aquatic biota. In certain environmental conditions, bloom forming cyanobacteria may exert rapidly their allelopathic potential and cha...

The basis for safety management is the assumption that safe conditions as well as safe behaviour at work do not arise spontaneously, but must be worked out according to a pre-approved program. It is known that preventive actions have a much greater importance and sense than the removing of a damage resulting from accidents. Therefore, it is necessary to take measures aimed at improving the working conditions, equipment and conduct of employees hired in the mine. The presented article is an attempt at a practical a...