Search Results (4)

Coagulase-negative staphylococci form a heterogeneous group defined solely by the lack of coagulase. Initially considered non-pathogenic, they are now known to be opportunistic pathogens of increasing importance. This study was conducted to examine the prevalence of Staphylococcus spp., their taxonomic diversity, antibiotic resistance patterns and genetic determinants of antibiotic resistance in the water resources used within the technical snow production process. The types of samples included (1) river water at intakes where water is drawn for snowmaking, (2) water stored in technical reservoirs, from which it is pumped into the snowmaking systems, (3) and technical snowmelt water. The study was conducted in the catchments of five rivers: Białka, Biały Dunajec, Raba and Wisła in Poland, and Studený Potok in Slovakia. Staphylococcus spp. was detected in all types of samples: in 17% of river water, 25% of reservoir-stored water and in 60% of technical snowmelt water. All staphylococci were coagulase-negative (CoNS) and belonged to 10 species, with S. epidermidis being the most prevalent in river water, S. warneri and S. pasteuri in reservoir-stored water and S. haemolyticus in snowmelt water. The highest resistance rates to erythromycin and macrolide/lincosamid/streptogramin b (MLSb) types of resistance were detected in all types of samples, accompanied by the erythromycin efflux pump-determining msrA gene as the most frequent genetic determinant of antibiotic resistance. This study is the first report of the presence of antibiotic-resistant, including multidrug-resistant, CoNS carrying more than one gene determining antibiotic resistance in technical snow in the mountain areas of the Central European countries. Full article

The aim of this research was to produce a new methodology for a special river bottom hazard mapping for the stability purposes of the biggest Polish water power plant: Włocławek. During the operation period of the water power plant, an engineering-geological issue in the form of pothole formation on the Wisła River bed in the gravel-sand alluvium was observed. This was caused by increased fluvial erosion resulting from a reduced water level behind the power plant, along with frequent changes in the water flow rates and water levels caused by the varying technological and economic operation needs of the power plant. Data for the research were obtained by way of a 4-year geodetic/bathymetric monitoring of the river bed implemented using integrated GNSS (Global Navigation Satellite System), RTS (Robotized Total Station) and SBES (Single Beam Echo Sounder) methods. The result is a customized river bottom hazard map which takes into account a high, medium, and low risk levels of the potholes for the water power plant structure. This map was used to redevelop the river bed by filling. The findings show that high hazard is related to 5% of potholes (capacity of 4308 m³), medium with 38% of potholes (capacity of 36,455 m³), and low hazard with 57% of potholes (capacity of 54,396 m³). Since the construction of the dam, changes due to erosion identified by the monitoring have concerned approximately 405,252 m³ of the bottom, which corresponds to 130 Olympic-size pools. This implies enormous changes, while a possible solution could be the construction of additional cascades on the Wisła River. Full article

The subject of this article is the presentation of site conditions and the authors’ concept of the development of the degraded riverside area located in the city of Cracow-Kraków Zabłocie. The concept transforms the above-named area into a multifunctional complex including museum, coworking, business and hotel functions. The area subject to development borders three important districts of Cracow: Old Town (Stare Miasto), Grzegórzki and Podgórze on the bank of the Vistula (Wisła) river. In the land development and urban planning documents of the city of Cracow this area has been marked as the public space which is to become a local focal point or a local centre. The main objective of this work was to find answers to the posed research questions concerning the historic context, formal and legal state, significance for the community as well as economic and ecological implications of the area to be developed. The main purpose was to properly develop the degraded riverside embankment in the downtown environment. The research method was based on own mixed method which encompassed the studies of historical literature and the legal–formal status as well as in situ examinations, including the analyses of the condition of the built and natural environment, traffic and circulation as well as photographic documentation. The authors also familiarised themselves with the activities undertaken by the local community with a view to the area’s regeneration. On the grounds of initial investigations, the SWOT analysis was performed and the evaluation of groups of prospective users was conducted. Comparative studies were conducted including selected examples of European riverside development projects. In its assumptions, the proposed concept of the riverside development in Kraków-Zabłocie is to meet the needs of the local community, enable further development of tourism, which is very important to Cracow, and satisfy the paradigm of sustainable development. The effect is a multi-functional complex that becomes an inherent part of the existing context. Full article

The main objective of this study was to characterize the muddy bottom sediments of three hydrologically different old river beds of the lower Vistula, located in the vicinity of Toruń: Port Drzewny, Martwa Wisła and Przybysz. Samples were taken at monthly intervals from April to November 2015 from two (Martwa Wisła and Przybysz) or three sampling sites (Port Drzewny) located in the central parts of the reservoirs. The bottom sediments of these water bodies were characterized by a low water content and organic matter content expressed as a percentage of dry weight, high organic matter content expressed in units of weight, as well as a high sediment oxygen demand. The most distinct reservoir was Martwa Wisła, most likely due to the lack of a connection with the River Vistula. Full article