Showing papers by "Wrocław University of Technology published in 1970"

Differences in metabolic profiles of planktonic and biofilm cells in Staphylococcus aureus - (1)H Nuclear Magnetic Resonance search for candidate biomarkers.

Abstract: Staphylococcus aureus is responsible for many types of infections related to biofilm presence. As the early diagnostics remains the best option for prevention of biofilm infections, the aim of the work presented was to search for differences in metabolite patterns of S. aureus ATCC6538 biofilm vs. free-swimming S. aureus planktonic forms. For this purpose, Nuclear Magnetic Resonance (NMR) spectroscopy was applied. Data obtained were supported by means of Scanning Electron Microscopy, quantitative cultures and X-ray computed microtomography. Metabolic trends accompanying S. aureus biofilm formation were found using Principal Component Analysis (PCA). Levels of isoleucine, alanine and 2,3-butanediol were significantly higher in biofilm than in planktonic forms, whereas level of osmoprotectant glycine-betaine was significantly higher in planktonic forms of S. aureus. Results obtained may find future application in clinical diagnostics of S. aureus biofilm-related infections.

Pig manure treatment by filtration.

Abstract: A study of new pig manure treatment and filtration process was carried out. The advantage of the worked out technology is the method of incorporation of crystalline phase into solid organic part of manure. The obtained new solid phase of manure contains about 50% of crystalline phase forming a filtration aid that enables high effectiveness of manure filtration. The filtration rate of manure separation into solid and liquid fractions with pressure filter may achieve 1300-3000 kg/m(2)/h. The method makes it possible to maintain an overall average pollutant removal performance 90% for the chemical oxygen demand COD, > 99% for the suspended solids SS, to 47% for the total nitrogen content. The obtained results showed that the proposed technology being efficient and simple offers a possible solution to pig manure problems.

The Electrodynamic Properties of Alkali Metals for Frequencies Much Smaller than the Debye Frequency

Abstract: The dielectric constant of polycrystalline alkali metals is studied for a longitudinal as well as a transversal of electromagnetic field. This quantity is computed explicitely in two limiting cases: the quasistatic limit and the quasihomogeneous limit. Only the collisionless region is considered. It is shown that the rf dielectric constant coincides with that for the infrared region in the quasistatic limit whereas both quantities differ in the quasihomogeneous limit. The collisionless region may be attainable rather at helium temperatures and for pure samples. The calculation method consists in application of correlation functions to the microscopic Fermi-liquid theory. [Russian Text Ignore]

Adaptive reuse of commercial and public buildings in Wroclaw Old Town in Poland. The occupant’s safety and comfort versus preservation of authenticity of monumental buildings

Abstract: There are more than a hundred historic public buildings in the centre of Wroclaw, adapted to fulfill modern commercial function. Against the background of today’s cosmopolitan shopping centers and office buildings, these buildings are distinguished by stylish architecture, maintained in eclectic, Art Nouveau or modernist forms. In the process of renewal of such monumental buildings, there is a need to reconcile the requirement for maximum protection of the historic material with safety and comfort of use. The multi-disciplinary construction design constituting the basis for the adaptive reuse of the heritage building must be preceded by conservation research and concept designs simulating possible program options. This allows linking the assessment of the value of the architecture with a choice of the matching function corresponding to the location and historic structure of the building. The further multi-disciplinary design process and implementation of such a project should be based on the Research by Design scheme. This allows for control of the implementation of the project and to rationalize the necessary upgrade of the facility with the application of such space and technical solutions that limit the destruction of its historic substance. The paper presents conclusions from several adaptive reuse projects carried out in such a way, in which it was possible to create high-class department stores, banks, hotels or prestigious offices inside the heritage buildings. The essence of these developments was to preserve the authenticity of the monumental building, while providing the necessary infrastructure, plant rooms and equipment guaranteeing safety and comfort of use.

Parallel inductor reduces transient saturation of current transformers

Abstract: A method of reducing the transient saturation of current transformers by connecting an external parallel inductor is presented. This combination behaves as a current transformer with an air gap and has most of its advantages. The effect of resistance in the inductor is brought out.

The earliest public green areas connected with Jelenia Góra, part. 2

Abstract: In the third part of the 18th century the earliest public landscape gardens began to appear in the area of suburban Jelenia Gora. They were the first public parks in Silesia. When establishing them, the natural landscape features of the area were used (Karkonosze). Two of them, Hausberg and Helkon, were created at the end of the 17th century on the north-western side of the city.