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Occurrence of Cryptosporidium, Giardia and Toxoplasma in surface waters in the area of Cracow

100%

Polus M. , Kocwa-Haluch R.

tom Vol. 40, nr 2

105--113

Despite some knowledge on the risks from exposure to intestinal parasitic protozoa such as Cryptosporidium, Giardia and Toxoplasma, no occurrence studies of these protozoa were conducted in Cracow area. Therefore, the purpose of the work was to examine the presence of Cryptosporidium, Giardia and Toxoplasma in surface water samples including intakes and recreational waters. The study showed that the vast majority of water samples were positive for Cryptosporidium sp., and some of the samples were positive for Giardia intestinalis. None of the tested water samples showed the presence of Toxoplasma. Given the limitations of the research methods used and the limits of detection, these results indicated that the concentration of protozoan cysts/oocysts may range from <1 to dozens oocysts/cysts per liter of water. These concentrations are comparable to the values given in reports of major worldwide outbreaks of cryptosporidiosis or giardiasis, which indicating a need to further investigate Cracow's surface waters.

Nośność na zginanie belek zespolonych metalowo-betonowych w warunkach pożaru standardowego

80%

Polus M. , Chybiński M. , Szumigała M.

tom R. 89, nr 7-8

128--132

W artykule porównano nośności na zginanie trzech wybranych belek zespolonych metalowo-betonowych w warunkach pożaru standardowego. Analizowano niezabezpieczone przed ogniem belki zespolone złożone z betonowej płyty oraz dźwigara wykonanego ze: stali konstrukcyjnej niestopowej S235J2 (1.0117), stali nierdzewnej X6CrNiMoTi17–12–2 (1.4571) i stopu aluminium AW-6061 T6 (EN AW-Al Mg1SiCu).

In this paper the bending resistance of three metal-concrete composite beams was compared under standard fire conditions. The analysed beams were not fire-protected. They consisted of a concrete slab and a girder made of: S235J2 (1.0117) steel, X6CrNiMoTi17-12-2 (1.4571) stainless steel and AW-6061 T6 (EN AW-Al Mg1SiCu) aluminium alloy.