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Asymmetric Dimethylarginine and Its Relation to Atherogenesis
Široká, Romana ; Racek, Jaroslav (advisor) ; Teplan, Vladimír (referee) ; Hyánek, Josef (referee)
ASYMMETRIC DIMETHYLARGININE - COMPARSION OF CHROMATOGRAPHY AND IMMUNOMETRIC METHODS Objective:Asymmetric dimethylarginine (ADMA) is often discussed in connection with hyperhomocysteinemia and its toxic effect on vessel wall. ADMA concentration is usually measured by HPLC (High Performance Liquid Chromatography) after previous derivatisation. Recently, ELISA (Enzym Linked Immuno Assay) methods for ADMA determination were introduced and ELISA kits are commercially available. Method and Result:The aim of the study was to compare HPLC and ELISA methods for ADMA determination. For HPLC determination we used equipments from Thermo separation product (Florida, USA). After solid-phase extraction on polymer cation-exchange column and the following derivatisation with o-phthaldialdehyde the samples were separated using C18 column (mobile phase 8.7% acetonitril, 50 mmol/l phosphate buffer, pH 6.5) and a fluorescence detector. NG-monomethyl-L-arginine was used as an internal standard. ADMA® ELISA kit, based on a competitive principle, was obtained from DLD Diagnostika, Hamburg, Germany. ADMA was measured in EDTA plasma of 40 healthy blood donors and 40 hemodialysis patients with hyperhomocysteinemia. Conclusion: In spite of different principles both methods showed a very good correlation (r = 0.944, p<0.0001). ELISA...
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Metabolic Effects of L-Carnitine Supplementation in Hemodialyzed Patients
Cibulka, Roman ; Racek, Jaroslav (advisor) ; Zima, Tomáš (referee) ; Eiselt, Jaromír (referee)
Chronic kidney failure is associated with many kinds of metabolic disorders caused by the kidney disease and also attributable to dialysis treatment. Phenomena such as accumulation or deficit of various substances and dysregulation of metabolic pathways participate in the pathogenesis of these changes. One of these disorders, which we studied in more detail, is a deficit of carnitine. Carnitine is a substance which plays an essential role in beta-oxidation of fatty acids by catalyzing their transport into the mitochondrial matrix. It enables obtaining of energy, namely in muscle cells including myocardium. Patients with chronic kidney failure treated by hemodialysis are known to have decreased carnitine concentration in plasma and tissues due to its impaired synthesis in kidneys and the great loss across the hemodialysis membrane during dialysis sessions. A single hemodialysis session reduces plasma free-carnitine concentrations to about one-third of their predialysis values because of small molecule of free-carnitine. On the other hand, renal elimination of acylcarnitine, which is physiologically ineffective, may be impaired in chronic kidney failure, leading to increased blood concentrations of acylcarnitine. Considerable evidence suggests that carnitine deficiency and abnormalities of carnitine...
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Biological properties of titanium alloy coated with hydroxyapatite in relation to immediate implant loading
Seydlová, Michaela ; Dostálová, Taťjána (advisor) ; Racek, Jaroslav (referee) ; Jelínková, Helena (referee)
Coating dental implants with hydroxyapatite may give certain advantages such as active encouragement to new bone growth, a lower rejection rate and an improved long-term prosthesis fixation. The biological properties of dental implants coated by the sandwich technique with a thin layer of hydroxyapatite and an interlayer of zirconia were evaluated. The implant samples were covered by pulsed laser deposition. The aim of this study is to evaluate the cytotoxicity and the surface characteristics of the titanium targets modified with zirconia and hydroxyapatite. We used a direct test of cytotoxicity, tests of fibroblasts adhesion and proliferation using counting of harvested cells and providing a MTT assay. No changes in the morphology or the proliferation rate of the cells used were found in the presence of the modified titanium targets. The results show adhesion and cell proliferation, which in turn implies that the studied material is not cytotoxic and is suitable for cell colonization. Titanium modified with zirconia and crystalline hydroxyapatite can improve the biological properties and so can be benefitially employed in oral bone surgery. Powered by TCPDF (www.tcpdf.org)
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Biological and mechanical properties of titanium implant covered with hydroxyapatite and zirconia layers and the approach to the immediate loading of dental implants
Teuberová, Zuzana ; Dostálová, Taťjána (advisor) ; Racek, Jaroslav (referee) ; Jelínková, Helena (referee)
Dental implantology is a branch, which has started a rapid evolution over the last years. All of the experts dealing with implantation are focused on extending indications for the application of the used materials to reduce the time period of therapy. Coating of the implants is a possible way how to treat patients in a shorter time period with the similar results as following the classical Bránemark protocol.Hydroxyapatite is one of the most attractive materials for human hard tissue implants because of its close resemblance to the bone and the teeth. Its positive influence on the healing process called osseointegration is obvious. Hydroxyapatite is of a brittle nature and limits the applications as the main solid material for the dental implants. Zirconia ceramics have several advantages such as the high strength and it is frequently used to reinforce other ceramics. The concept of adding zirconia as the second phase to hydroxyapatite significantly increased the bonding strenght.In the dissertation pulsed laser deposition is shown as one of the coating method. The bioceramic zirconia samples were characterized by methods for thin solid film analysis such as X-ray diffraction, morfology investigation by electrone microscope and measurement of the film thickness. Afterwards we examined the mechanical...
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Oxidative stress, microinflammation and cardiovascular risk in patients with chronic kidney disease
Hodková, Magdalena ; Kalousová, Marta (advisor) ; Průša, Richard (referee) ; Racek, Jaroslav (referee)
Chronic kidney disease (CKD) patients are at a significantly higher risk of atherosclerotic complications when compared to the general population. Oxidative stress and the related chronic microinflammation are possible causes of this increased cardiovascular risk, which is most pronounced in patients undergoing chronic haemodialysis (HD) treatment. Oxidative stress in HD patients can be further increased by routine pharmacological interventions (especially by intravenous - i.v. iron preparations administration). The aim of the thesis was to investigate neutrophil respiratory burst and some molecules related to oxidative stress and chronic inflammation - pregnancy-associated plasma protein-A (PAPPA), advanced oxidation protein products (AOPP), C-reactive protein (CRP), intercellular adhesion molecule-1 (ICAM-1) and E-selectin during HD session and to find out whether they can be pharmacologically affected by i.v. ferric sodium-gluconate and oral vitamin E administration. We focused on studying PAPP-A in chronic renal disease (CKD) patients, patients treated with continuous ambulatory peritoneal dialysis (CAPD) and chronic HD patients. We have observed that HD patients' neutrophils are primed to generate greater quantities of superoxide than those of healthy controls. This production decreases during HD and...
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Analýza a návrh environmentálních datových modelů a vnějších rozhraní JISŽP kompatibilních s EU
Masarykova univerzita v Brně, Fakulta informatiky, Brno ; Ráček, Jaroslav ; Pitner, Jiří ; Hřebíček, Jiří
Cílem projektu je vyvinutí centrálního výstupního datového modelu pro MŽP, který bude reflektovat potřeby strategického plánování, nadoborové informační podpory státní správy, informování veřejnosti, spolupráce s komerční sférou a mezinárodní reporting, dle aktuálních požadavků na integrovaný reporting. Datový model bude respektovat pyramidu MDIAR definovanou EEA včetně jejich datových modelů, rozhraní a nástrojů pro naplnění legislativních požadavků EU, dále požadavky na reporting OECD, UNEP a mezinárodních smluv, jimiž je ČR vázána. Zpráva popisuje průběh vývoje analytické databáze a její obsah, aktuální stav analýzy reportingových procesů, analýzy Reportnet a analýzy stávajících signifikantních datových zdrojů. Obsahuje vyhodnocení provedených analýz a výsledky prvních konzultací se zahraničními partnery.
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