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Utilization of advanced rheological techniques for the study of biological systems
Krňávková, Šárka ; Kráčalík, Milan (referee) ; Smilek, Jiří (advisor)
A new method for determining viscoelastic properties on the interfacial interface called interfacial rheology was intoduced and investigated. Measured data were compared with data from tanziometer for model system of surfactant. Three concentration renge of surfactant, namely SDS (anionic), TTAB (cationic) and Tween (nonionic), were measured. From the measured data the influence of structure, critical micellar concentration and charge on the viscoelastic properties of the interfacial interface was determined. Furthermore, this new method was used for biological systems and specifically for biofilms of two bacterial strains. First, the viscoelastic properties of biofilms on the agar were determined, and the viscoelastic properties dependence on temperature
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Extracellular matrix in yeast populations
Novotná, Pavla ; Kuthan, Martin (advisor) ; Dvořáček, Lukáš (referee)
The microorganisms in a natural environment are frequently found in multicellular forms, most commonly in biofilms. Biofilm is characterized as a community of cells living at the interface of two environments, embedded in the extracellular matrix. ECM is a significant component of biofilms in yeast populations. Extracellular matrix acts as a protective barrier and allows cells to survive under adverse conditions and better compete with other microorganisms. It also forms an effective barrier against antibiotics and other harmful substances, what makes biofilms a serious problem in medicine and industry. Formation of the matrix may be influenced by the morphological forms of colonies. Increased formation of ECM is commonly connected in phenotypic switching in response to changes of their living conditions. The compositeion of the ECM is a genus-and species-specific. The main component of the matrix consists of polysaccharides and proteins.
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Metamorphoses of \kur{Borrelia burgdorferi} sensu lato spirochetes: from dormant to motile forms
MORÁVKOVÁ, Veronika
The aim of the study was to obtain and elaborate information focused on metamorphoses of Borrelia burgdorferi sensu lato (s.l.) spirochetes. The research included detection of various stress conditions for production of dormant forms of Borrelia burgdorferi s.l. spirochetes in vitro. Subsequently, metamorphoses from dormant to motile stages was observed under favourable conditions. Proper PCR method for primers aimed to detect dormant forms of Borrelia was delevoped. The infectious potential of dormant spirochetes of Borrelia burgdorferi sensu stricto (s.s.) complex was observed in vivo. Transformations of spirochetes have also been observed in real time and individual stages have been recorded.
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Extracellular matrix in yeast populations
Novotná, Pavla ; Kuthan, Martin (advisor) ; Dvořáček, Lukáš (referee)
The microorganisms in a natural environment are frequently found in multicellular forms, most commonly in biofilms. Biofilm is characterized as a community of cells living at the interface of two environments, embedded in the extracellular matrix. ECM is a significant component of biofilms in yeast populations. Extracellular matrix acts as a protective barrier and allows cells to survive under adverse conditions and better compete with other microorganisms. It also forms an effective barrier against antibiotics and other harmful substances, what makes biofilms a serious problem in medicine and industry. Formation of the matrix may be influenced by the morphological forms of colonies. Increased formation of ECM is commonly connected in phenotypic switching in response to changes of their living conditions. The compositeion of the ECM is a genus-and species-specific. The main component of the matrix consists of polysaccharides and proteins.
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Utilization of advanced rheological techniques for the study of biological systems
Krňávková, Šárka ; Kráčalík, Milan (referee) ; Smilek, Jiří (advisor)
A new method for determining viscoelastic properties on the interfacial interface called interfacial rheology was intoduced and investigated. Measured data were compared with data from tanziometer for model system of surfactant. Three concentration renge of surfactant, namely SDS (anionic), TTAB (cationic) and Tween (nonionic), were measured. From the measured data the influence of structure, critical micellar concentration and charge on the viscoelastic properties of the interfacial interface was determined. Furthermore, this new method was used for biological systems and specifically for biofilms of two bacterial strains. First, the viscoelastic properties of biofilms on the agar were determined, and the viscoelastic properties dependence on temperature
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Role of MDR transporters in yeast biofilm resistance
Urbanová, Daniela ; Palková, Zdena (advisor) ; Seydlová, Gabriela (referee)
This work is focused on multidrug resistance transporters (MDR) and their role in the drug resistance of yeast biofilms. Biofilms are structured microbial communities that are markedly different from planktonic cells. Biofilm cells produce extracellular matrix and display other typical characteristics related to their enormous resistance to antimicrobial agents. MDR pumps contribute to higher resistance of biofilms only during early phases of biofilm development; later, MDR pumps are substituted by many other mechanisms. Cdr1p, Cdr2p and Mdr1p are the most important MDR transporters of Candida albicans. Cdr1p and Cdr2p cause resistance to azoles - fluconazole, ketoconazole and itraconazole, which have been widely used as drugs against yeast infections. Mdr1p contributes also to the resistance to fluconazole. Drug resistance causes considerable problems in the treatment of fungal infections. For this reason, it is so important to understand drug-resistance mechanisms of yeast communities. Keywords: resistance, MDR transporters, Candida albicans, biofilms
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