Work in a special school as a supportive teacher of disabled children requires experience and mental resilience. The supportive teacher is exposed to a whole range of difficult behaviors of the child (i.e. psychosocial risks), including aggression, which brings many other threats with a dangerous nature (accidental). In this paper the results of research conducted among supportive teachers from one of the Polish special schools have been presented. The research contains the identification of psychosocial risks and, as a consequence, indications of ailments observed by the supportive teachers. The results of the conducted survey concern the type of threats with particular emphasis on psychosocial risks, as well as preventive activities that minimize the effects of these threats. In addition, the respondents indicated the extent of professional work on private and family life. The research tool used in this study is a questionnaire divided into three parts: hazard identification, assessment of psychosocial risks and potential effects of their occurrence, and subjective assessment of the impact of professional work on private life.
Eutrophication of waters and climate warming have created in the last decades favourable conditions for cyanobacteria colonization. The presence of cyanobacteria toxins in heavily polluted lake waters and fish ponds has become a current problem. These toxins belong to cyanobacteria secondary metabolites and are active in various fields of harmfulness to animals and humans. This group includes neurotoxins, dermatotoxins and hepatotoxins having a destructive influence on liver's cells. The group of hepatotoxins comprises microcystins and nodularin. The symptoms of hepatotoxin poisoning include stomach, intestine and liver disorders, intra-liver bleeding and physiological insufficiency of this organ.
These compounds can induce apoptosis of liver cells and tumor promoters. From the above facts, it follows that hepatotox-ins can pose a very serious health problem on a global scale. This work presents the characteristic of cyanobacterial hepato-toxins, their chemical structure, properties, and mechanism of their action on human organism. The harmful influence caused by consuming products used in diet supplements, which contain microcystins was also pointed out.