46 research outputs found

    VLIT NODE Sensor Technology and Prefarm

    Get PDF
    Precision farming systems are based on a detailed monitoring of information and data that are necessary for successful decision-making in crop production. The system is designed for data collection from several resources. In past years an extensive research and development work has been done in the field of wireless sensor networks (WSN) in the world. When a wireless sensor network (WSN) is used for agricultural purposes, it has to provide first of all a long-reach signal. The present paper describes new long distance RFID based technology implementation - VLIT NODE.Wireless Sensor Network, Precision Agriculture, RFID., Research and Development/Tech Change/Emerging Technologies, Research Methods/ Statistical Methods, GA, IN,

    Study of bioactive secondary metabolites produced by fungi of genus Geosmithia using UPLC-DAD-TOF-MS

    Get PDF
    (CZ) Tato práce se zabývá studiem kmenu hub RJ0258 (Geosmithia sp.9), u kterého byla dříve zjištěna produkce sekundárních metabolitů s antimikrobiální aktivitou. Produkce sekundárních metabolitů je značně závislá na kultivačních podmínkách a následné získávání těchto metabolitů na typu použité extrakční metody. Práce zahrnuje optimalizaci kultivačních podmínek houbové kultury pro zajištění maximální produkce látek s antimikrobiální aktivitou, následné zpracování fermentačního média, metodiku extrakce těchto biologicky aktivních látek a jejich separaci kapalinovou chromatografií. Při provedených testech bylo zjištěno optimální složení kultivačního média - agar s maltózovým extraktem (MEA - 100 ml, maltózový extrakt - 2 g, glukosa - 2 g, pepton 0,1 g, úprava pH na 5-6). Dále bylo zjištěno, že nejvhodnější doba kultivace je 11 dní od počátku kultivace, kdy dochází na základě testů biologické aktivity k největší produkci sekundárních metabolitů s antimikrobiální aktivitou. Po kultivaci bylo fermentační médium extrahováno metodou kapalina-kapalina roztokem 5% kyseliny octové v ethylacetátu. Po odpaření a rozpuštění získaného extraktu byl extrakt analyzován metodou UPLC-DAD-TOF-MS. Analýzy probíhaly na koloně Acquity UPLC BEH C18 a extrakt byl separován za použití lineární gradientové eluce s mobilními...(EN) This work is dealing with study of fungal strain RJ0258 (Geosmithia sp.9) which was previously found to be the producer of secondary metabolites with antimicrobial activity. Production of secondary metabolites is significantly dependent on the conditions of cultivation and the subsequent gaining of these metabolites depends on the extraction method as well. This thesis involves the optimization of the cultivation conditions for fungal culture to ensure maximum production of substances with antimicrobial activity, the subsequent treatment of the fermentation medium, the extraction procedure focused on biologically active substances and finally the chromatographic separation. The most suitable design of the fermentation broth was chosen based on the tests - Malt extract agar medium (MEA - 100 ml, malt extract - 2 g, glucose - 2 g, pepton 0,1 g, pH adjusted to 5-6). Moreover, it was found out, that the optimal time of cultivation is 11 days, because, according to the test of biological activity, there is the highest production of secondary metabolites with antimicrobial activity. Following cultivation, the fermentation medium was extracted liquid-liquid extraction employing solution of 5% acetic acid in ethyl acetate. After evaporation and dissolution of the extract the obtained extract was...Katedra analytické chemieDepartment of Analytical ChemistryPřírodovědecká fakultaFaculty of Scienc

    Development of HPLC-DAD-MS/MS method for determination of selected toxins in Amanita phalloides.

    Get PDF
    (CZ) Tato práce byla zaměřena na vývoj a optimalizaci analytické metodiky, pomocí vysokoúčinné kapalinové chromatografie s detekcí diodovým polem (HPLC-DAD) a vysokoúčinné kapalinové chromatografie s detekcí diodovým polem a tandemovou hmotnostní spektrometrií (HPLC-DAD-MS/MS), pro stanovení amatoxinů (α- a β-amanitinu) a falotoxinů (falacidinu a faloidinu) v hrubém extraktu z kloubouku muchomůrky zelené. S cílem zaručit spolehlivost analytických výsledků byl studován vliv různých parametrů na kvalitu separace a samotné stanovení. Vyvinutá metoda HPLC-DAD dosahuje dobré linearity v rozmezí koncentrací 1 - 100 µg/ml, kdy korelační koeficienty pro obě kalibrační závislosti všech sledovaný látek jsou vyšší než 0,997. Pro stanovované toxiny byly vypočteny limity detekce (LOD) a kvantifikace (LOQ), pro α-amanitin 0,90 µg/ml (LOD); 2,99µg/ml (LOQ), β-amanitin 1,07 µg/ml (LOD); 3,56 µg/ml (LOQ), falacidin 2,17 µg/ml (LOD); 7,26 µg/ml (LOQ) a faloidin 0,79 µg/ml (LOD); 2,64 µg/ml (LOQ). Klíčová slova: muchomůrka zelená, -amanitin,-amanitin, falacidin, faloidin, extrakce tuhá látka-kapalina, HPLC-DAD, HPLC-DAD-MS/MS(EN) This work has been focused on the development and optimization of analytical methodology, using high performance liquid chromatography with diode array detection (HPLC-DAD) and high performance liquid chromatography with diode array and tandem mass spectrometric detection (HPLC-DAD-MS/MS) for the determination of amatoxins (α- and β-amanitin) and phalotoxins (phallacidin and phalloidin) in the crude extract from cap of Amanita phalloides with the option to later use for clinical purposes. In order to guarantee the reliability of the analytical results the influence of various parameters on the quality of the separation and the determination of toxins was studied. The developed HPLC-DAD method achieves good linearity in the concentrations range 1 - 100 µg/ml, with correlation coefficients higher than 0,997. Limits of detection (LOD) and quantitation (LOQ) were calculated for all the studied toxins with following values: for α-amanitin 0,90 µg/ml (LOD); 2,99 µg/ml (LOQ), β-amanitin 1,07 µg/ml (LOD); 3,56 µg/ml (LOQ), phallacidin 2,17 µg/ml (LOD); 7,26 µg/ml (LOQ) and phalloidin 0,79 µg/ml (LOD); 2,64 µg/ml (LOQ). Key words: Amanita phalloides,-amanitin,-amanitin, phallacidin, phalloidin, solid-liquid extraction, HPLC-DAD, HPLC-DAD-MS/MS .Department of Analytical ChemistryKatedra analytické chemieFaculty of SciencePřírodovědecká fakult

    Porovnání metod pro odhad omezených veličin s aplikací na ekonomická data

    Get PDF
    Diplomová práce představuje přehled základních technik pro filtrování nepozorovaných proměnných při použití stavové reprezentace modelu a stavových omezení ve tvaru nerovnic. Zabývá se především odvozením Kalmanova filtru, jeho rozšířením do nelineární podoby a použitím omezení na stavové proměnné. Alternativní přístupy pomocí stavového modelu s rovnoměrně rozloženým šumem a Sequential importance sampling jako jedna z metod Particle filtrů využívající Monte Carlo simulace jsou také popsány. Všechny tři metody jsou aplikovány na semistrukturální model použitelný pro analýzu měnové politiky. Filtrace používá makroekonomická data české ekonomiky a zohledňuje nezáporné omezení úrokových sazeb jako jeden z modelových stavů. Výsledky jsou navzájem srovnány a diskutovány.The thesis introduces an overview of techniques for filtering of unobserved variables using a state-space representation of a model and state inequality constraints. It is mainly aimed at a derivation of the linear Kalman filter, its extension into a form of a non-linear filter and imposing state constraints. The state uniform model with noise bounds and the sequential importance sampling, as a method of particle filters using Monte Carlo simulations, are described as alternative methods. These three methods are applied on a simple semi-structural model for a monetary policy analysis. The filtration is based on Czech macroeconomic data and reflects an imposed non-negative state constraint on the interest rate. Results of the algorithms are compared and discussed.Katedra pravděpodobnosti a matematické statistikyDepartment of Probability and Mathematical StatisticsMatematicko-fyzikální fakultaFaculty of Mathematics and Physic

    Beitrag zur Gliederung des Würm in Mitteleuropa

    Get PDF
    In der Arbeit werden neue Erkenntnisse über die Stratigraphie der letzten Eiszeit in Mähren mitgeteilt. Dabei stützen wir uns nicht nur auf Lößaufschlüsse, sondern auch auf zahlreiche Grabungsergebnisse in den Höhlen des Mährischen Karstes, wo es in den Höhleneingängen gelegentlich zu Verknüpfungen der typischen Lößbildungen mit den viele paläontologische und archäologische Funde enthaltenden Höhlensedimenten gekommen ist. Wenn wir daher rein stratigraphische Erkenntnisse auswerten, stützen wir uns doch in großem Maße auf die eingeschlossenen Funde. Wir kommen zu dem Schlüsse, daß die Würmeiszeit eine stark gegliederte Periode darstellt. Aus diesem Grunde geben wir die von uns bisher benützte Bezeichnung der Interstadiale durch Abkürzungen auf und ziehen die Benennung nach den typischen Lokalitäten vor. Wir bringen weitere Beweise für die Existenz des Mittelwürm-Interstadials, welches wir mit dem Namen Interstadial Podhradem bezeichnen.researc

    6-benzothiazolyl ureas, thioureas and guanidines are potent inhibitors of ABAD/17β-HSD10 and potential drugs for Alzheimer's disease treatment : design, synthesis and in vitro evaluation

    Get PDF
    Background : The mitochondrial enzyme amyloid beta-binding alcohol dehydrogenase (ABAD) also known as 17β-hydroxysteroid dehydrogenase type 10 (17β-HSD10) has been connected with the pathogenesis of Alzheimer’s disease (AD). ABAD/ 17β-HSD10 is a binding site for the amyloid-beta peptide (Aβ) inside the mitochondrial matrix where it exacerbates Aβ toxicity. Interaction between these two proteins triggers a series of events leading to mitochondrial dysfunction as seen in AD. Methods : As ABAD’s enzymatic activity is required for mediating Aβ toxicity, its inhibition presents a promising strategy for AD treatment. In this study, a series of new benzothiazolylurea analogues have been prepared and evaluated in vitro for their potency to inhibit ABAD/ 17β-HSD10 enzymatic activity. The most potent compounds have also been tested for their cytotoxic properties and their ability to permeate through blood-brain barrier has been predicted. To explain the structure-activity relationship QSAR and pharmacophore studies have been performed. Results and Conclusions : Compound 12 was identified being the most promising hit compound with good inhibitory activity (IC50 = 3.06 ± 0.40µM) and acceptable cytotoxicity profile comparable to the parent compound of frentizole. The satisfactory physical-chemical properties suggesting its capability to permeate through BBB make compound 12 a novel lead structure for further development and biological assessment.PostprintPeer reviewe

    Design, synthesis and in vitro evaluation of benzothiazole-based ureas as potential ABAD/17β-HSD10 modulators for Alzheimer’s disease treatment

    Get PDF
    This work was supported by the Ministry of Health of the Czech Republic (no. NV15-28967A), Charles University in Prague (no. GAUK B-CH/992214, SVV 260 291) and the Alzheimer’s Society (specifically The Barcopel Foundation). This research is part-funded by the MSD Scottish Life Sciences fund.Amyloid-beta peptide (Aβ) has been recognized to interact with numerous proteins, which may lead to pathological changes in cell metabolism of Alzheimer’s disease (AD) patients. One such known metabolic enzyme is mitochondrial amyloid-binding alcohol dehydrogenase (ABAD), also known as 17β-hydroxysteroid dehydrogenase type 10 (17β-HSD10). Altered enzyme function caused by the Aβ-ABAD interaction, was previously shown to cause mitochondrial distress and a consequent cytotoxic effect, therefore providing a feasible target in AD drug development. Based on previous frentizole derivatives studies, we report two novel series of benzothiazolyl ureas along with novel insights into the structure and activity relationships for inhibition of ABAD. Two compounds ( 37 , 39 ) were identified as potent ABAD inhibitors, where compound 39 exhibited comparable cytotoxicity with the frentizole standard; however, one-fold higher cytotoxicity than the parent riluzole standard. The calculated and experimental physical chemical properties of the most potent compounds showed promising features for blood-brain barrier penetration.PostprintPeer reviewe

    Comparison of modern television broadcast standards

    No full text
    This bachelor thesis is thematically focused on modern TV broadcast standards. The emphasis is on the future development and possibilities. The first part provides a comprehensive overview of the main topic addressed in terms of significant changes in the second generation of digital technology. Including methods currently tested. The greatest emphasis is placed on terrestrial broadcast due to the significance of this method in the Czech Republic and currently ongoing transition to the second generation of broadcasting. The second part focuses on the analysis of the actual developments, and the not too distant future of the television broadcasting. The actual situation of the auction of frequencies is introduced together with the estimation of the allocation of the spectrum. Analyses the potential costs for the viewer and the signal provider, and compare the status of broadcasting in Europe with the situation in the Czech Republic. Further, are defined and analysed the possibilities of the next development of the terrestrial broadcasting

    Metody pro odhad stavových omezení : Porovnání a aplikace na problém nulových úrokových sazeb

    No full text
    Rigorózní práce představuje přehled základních technik pro filtrování nepozorovaných proměnných při použití stavové reprezentace modelu a stavových omezení ve tvaru nerovnic. Zabývá se především odvozením Kalmanova filtru a použitím omezení na stavové proměnné. Alternativní přístupy pomocí stavového modelu s rovnoměrně rozloženým šumem a Sequential importance sampling jako jedna z metod částicových filtrů (Particle filtrů) využívající Monte Carlo simulace jsou také popsány. Všechny tři metody jsou aplikovány na semistrukturální model použitelný pro analýzu měnové politiky. Filtrace používá makroekonomická data české ekonomiky a zohledňuje v čase proměnné nezáporné omezení nominálních úrokových sazeb jako jeden z modelových stavů. Výsledky jsou navzájem srovnány a diskutovány. Powered by TCPDF (www.tcpdf.org)The thesis introduces an overview of techniques for filtering of unobserved variables using a state-space representation of a model and state inequality constraints. It is mainly aimed at a derivation of the linear Kalman filter and imposing state constraints. The state uniform model with noise bounds and the sequential importance sampling, as a method of particle filters using Monte Carlo simulations, are described as alternative methods. These three methods are applied on a simple semi-structural model for a monetary policy analysis. The filtration is based on Czech macroeconomic data and reflects an imposed time-varying non-negative state constraint on the nominal interest rate. Results of the algorithms are compared and discussed. Powered by TCPDF (www.tcpdf.org)Katedra pravděpodobnosti a matematické statistikyDepartment of Probability and Mathematical StatisticsFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult

    Porovnání metod pro odhad omezených veličin s aplikací na ekonomická data

    Get PDF
    The thesis introduces an overview of techniques for filtering of unobserved variables using a state-space representation of a model and state inequality constraints. It is mainly aimed at a derivation of the linear Kalman filter, its extension into a form of a non-linear filter and imposing state constraints. The state uniform model with noise bounds and the sequential importance sampling, as a method of particle filters using Monte Carlo simulations, are described as alternative methods. These three methods are applied on a simple semi-structural model for a monetary policy analysis. The filtration is based on Czech macroeconomic data and reflects an imposed non-negative state constraint on the interest rate. Results of the algorithms are compared and discussed
    corecore