[The effect of water pipelines on the quality of drinking water].

The purpose of the study was to assess the effects of various pipelines on drinking water quality. For the study carried out in Warsaw buildings were chosen in which the installations were made of polypropylene, polyvinyl chloride, copper and steel. Water samples were taken from the sites of water leading to the buildings and from the highest floors, if possible.

[Choice of media for detection of Streptococcus faecalis in routine water testing].

The aim the study was to find a medium for routine water testing for detection of Streptococcus faecalis which could be used by water supply laboratories and sanitary services. In the study dry ready Merck media were used: Mf-enterococcus agar, MF-enterococcus agar base, K-F-streptococcus agar, and Azide Nutrient Pad Sets (of Sartorius). The Slanetz-Bartley medium prepared in our laboratory National Institute of Hygiene (PZH).

[Condition of the periodontium and mouth mucosa in workers exposed to fluorides].

Stomatological and mycological examinations of the workers at the fusion department of the RZWM "Silesia" showed a considerable intensification of paradontium diseases (about 80% of cases). Leukoplakia and candidiasis were the most common changes found on the mucous membrane in the oral cavity. Mycological investigations carried out on the Sabourand culture showed Candida albicans in 73,7% of cases.