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The role of the bone strength on the cyst growth in the mandible

Miodowska Justyna, Bielski Jan, Kromka-Szydek Magdalena

Engineering Transactions

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2019

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Vol. 67, iss. 3

293--300

EN

Intracystic fluid pressure is discussed as a potentially important factor influencing a bone cyst growth. This process can develop in the course of months. However, the exact mechanism remains speculative. In this paper, we use an established mathematical model to evaluate whether the presence of pressurized fluid in bone cavities may result in cyst growth. A continuous function of bone density rate vs. mechanical stimulus is used. The numerical model of the mandible with the cyst is used to predict the stress-stimulated change in bone density around the cavity.

2

Ocena częstości występowania pierwotniaków pasożytniczych z rodzajów Cryptosporidium i Giardia w wybranych kąpieliskach województwa mazowieckiego

Szczotko M., Matuszewska R., Giziński R., Krogulska B.

Ochrona Środowiska

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2015

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Vol. 37, nr 1

49--53

PL

Pierwotniaki pasożytnicze z rodzajów Cryptosporidium i Giardia nie są elementem kontroli jakości wód powierzchniowych, na których usytuowane są kąpieliska. W pracy podjęto ocenę częstości występowania tych pierwotniaków w wybranych wodach powierzchniowych wykorzystywanych do rekreacji na terenie województwa mazowieckiego. Dodatkowo oznaczono wartości wskaźników mikrobiologicznych (E. coli, enterokoki) oraz zawartość przetrwalników klostridiów redukujących siarczyny. Badania potwierdziły obecność Cryptosporidium sp. i Giardia sp., odpowiednio w 65% i 95% badanych próbek wody. Średnia liczba wykrytych pierwotniaków Cryptosporidium sp. wynosiła 0,11 oocyst w 1 dm3, a Giardia sp. 0,31 cyst w 1 dm3 wody. Źródłem (oo)cyst w wodzie mogły być zanieczyszczenia rolnicze, a także nieuregulowana gospodarka ściekowa gospodarstw położonych w pobliżu kąpielisk. Liczba spor klostridiów redukujących siarczyny (wskaźnik nienormowany) nie przekraczała 50 jtk/100 cm3. Wyniki wykonanych oznaczeń wskazały na celowość rozszerzenia zakresu rutynowych badań mikrobiologicznych wody przeznaczonej do rekreacji o te wskaźniki sanitarne w celu poprawy bezpieczeństwa zdrowia ludzi.

EN

Monitoring of protozoan parasite species, Cryptosporidium and Giardia, is not covered by quality control system of surface waters in designated swimming areas. The objective of this study was to assess the prevalence of these protozoa in the selected surface waters used for recreational activities in Masovian voivodship. In addition, microbiological parameters (E.coli, enterococci) as well as the spore content of sulphite-reducing clostridia were determined. The studies confirmed the presence of Cryptosporidium sp. and Giardia sp. in 65% and 95% of tested water samples, respectively. The average number of detected Cryptosporidium sp. oocysts was 0.11 oocysts per 1 dm3, while of Giardia sp. – 0.31 cysts per 1 dm3 of water. The source of protozoan oocysts could be agricultural contamination as well as unregulated processes of wastewater management at farms located near the swimming areas. The spore number of sulphite-reducing clostridia (non-standardized parameter) did not exceed 50 cfu/100 cm3. The study results confirm that it is purposeful to extend the routine microbiological testing methodology of recreational water by the discussed sanitary indicators in order to improve health security of the population.

3

Occurrence and germination of dinoflagellate cysts in surface sediments from the Red Sea off the coasts of Saudi Arabia

Mohamed Z.A., Al-Shehri A.M.

Oceanologia

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2011

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No. 53 (1)

121-136

EN

The distribution and abundance of dinoflagellate cyst assemblages were investigated in surface sediments from south-western Red sea coasts of Saudi Arabia at six sites during March 2010. A total of 19 taxa of dinoflagellate cysts were identified from all sites. The sampling sites showed a similar cyst assemblage, but they differed in total cyst abundance (3 to 4083 cysts g-1 dry weight). Cyst abundance was strongly correlated with sediment characteristics, the highest numbers being recorded in sediments with large contents of organic carbon, silt and clay. Cyst assemblages were dominated by cysts of potentially toxic species, including Cochlodinium polykrikos, Prorocentrum minimum, Dinophysis acuminata, Alexandrium catenella and Scrippsiella trochoidea. Most cysts germinated successfully at different rates at 15 and 25°C. This study suggests that surface sediments from all Saudi Red Sea coasts should be monitored for the presence of dinoflagellate cysts to give ample warning of the presence and abundance of toxic species in a given area