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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Host Gene Expression Profiling of Japanese Encephalitis Virus Infected cells : Identification of Novel Pro- and Anti-viral Genes

Bhandari, Prakash January 2013 (has links) (PDF)
Japanese encephalitis virus (JEV), a mosquito-borne flavivirus is the causative agent of Japanese encephalitis (JE). The disease affects mostly children and around 30000– 50000 cases of JE and up to 15000 deaths are reported annually. No anti-viral drugs have been discovered against JE so far, but advances in our knowledge of the molecular biology of flaviviruses is propelling flaviviral drug research at an expeditious pace. Since JEV has a small genome which encodes for only ten proteins, there is dearth of potential drug targets. Researchers are now focusing on cellular interactomes, a complex and dynamic molecular biosystem which identifies host proteins which interact with either viral proteins or viral genomes, leading to the generation of an astronomical number of potential drug targets involving common cellular pathways that are required for the life cycle of different viruses. Such studies can pave way for the development of ‘broad-spectrum’, ‘silver-bullet’ anti-viral drugs for the treatment of multiple viral diseases. The cellular interactomes can be studied by Genomics tools such as microarray. Systematic profiling of genes involved in virus infection by RNAi, transcriptome sequencing, microRNA profiling and yeast two-hybrid system has allowed us to assess global gene expression changes providing an unprecedented view on the host-side of the virus–host interactions. Advent of these tools has led to identification of plethora anti-viral genes. For example, over expression of IFN-stimulated gene15 (ISG15) results in inhibition of JEV leading to significant reduction of viral titers. Chemokine profiling of JEV-infected cells by microarray can provide possible therapeutic modalities that can mitigate the morbidity associated with JEV infection. Functional classification of interferon-stimulated genes (ISG) identified using innovative methods have been the stepping stone for identification of many anti-viral genes, among them are few Broadly acting effectors like IRF1, C6orf150, HPSE, RIG-I, MDA5 and IFITM3 and some more targeted antiviral specific like DDX60, IFI44L, IFI6, IFITM2, MAP3K14, MOV10, NAMPT, OASL, RTP4, TREX1 and UNC84B. In this study, we have identified a B16F10 murine melanoma cell line that is resistant to JEV infection. DNA microarray analysis of JEV-susceptible and resistant B16F10 cell lines gave us interesting insights into JEV-induced host gene expression changes. Real time PCR validation of microarray data indicates that a number of virus and interferon inducible genes are expressed constitutively at high levels in this JEV-resistant cell line. Further, several of the mouse genes induced by JEV in B16F10 cell line were also upregulated in JEV-infected mouse brain. To understand the significance of these host gene expression changes, we attempted to generate stable murine cell lines constitutively expressing select JEV-inducible genes and study the JEV infection pattern in these cell lines. One of the JEV-inducible genes encoding thymidylate kinase (Tyki), a mitochondrial protein involved in the sysnthesis of nucleoside diphosphates, when overexpressed in NIH3T3 cells confers resistance to JEV infection as evident from reduced JEV-induced cytopathic effects and significant reduction in viral titer. Since TYKI has two distinct domains: the N-terminal domain with unknown function and the C-terminal domain with the nucleoside monophosphate kinase function, suggest that TYKI may be a bifunctional protein with other biological functions in addition to its UMP-CMP kinase activity. In order to examine whether N-terminal domain is responsible for antiviral activity of the protein, a stable cell line constitutively expressing N-terminal domain of gene was made, but the overexpression of N-terminal domain didn't confer any antiviral immunity. Thus signifying importance of kinase activity in confering antiviral immunity. Our studies indicate for the first time that Tyki may have a role in host resistance to JEV and understanding the mechanism of action Tyki may pave way for novel anti-JEV therapy. Stable cell lines constitutively expressing other JEV-inducible genes (Atf3, Gimap3, Rtp4, Glipr2, Tmem140 and Garg49) couldn't be generated. Therefore, to study the effect of overexpression of these genes on JEV infection, expression vectors encoding these genes were transfected individually to human 293T cells by nucleofection, then infected with JEV and viral titres were examined by plaque assay. Nucleofection was opted as a method of choice since it is the only non-viral method, which transfects DNA directly enter the nucleus. In contrast, other commonly used non-viral transfection methods rely on cell division for the transfer of DNA into the nucleus. Nucleofection of vectors encoding different JEV-inducible genes followed by JEV infection and assay of viral titer led to identification of one more anti-viral gene and three pro-viral genes. Garg49, an interferon and JEV inducible mitochondrial gene was identified as antiviral gene. Further studies led to the identification of GARG49 as a mitochondrial protein. Three genes, Atf3, encoding a cAMP responsive element binding protein family transcription factor, Glipr2, encoding a Glioma related pathogenesis protein and Gimap3, encoding an outer mitochondrial membrane GTPase were identified as pro viral genes. Overexpression of Tmem140, encoding a transmembrane protein and Rtp4, encoding a golgi chaperone did not significantly affect JEV titer. Conclusions: . A JEV-resistant B16F10 murine melanoma cell line was identified and several JEV-inducible genes were found to be expressed constitutively at high levels in this cell line. .We demonstrate for the first time that Tyki/Ump-Cmpk2 encoding a mitochondrial nucleoside monophosphate kinase has an anti-JEV function and the C-terminal domain is essential for anti-viral activity. .Garg49/Ifit3 encodes an interferon and JEV-inducible mitochondrial protein and it has an anti-JEV function. . Activating transcription factor 3 (ATF3), GTPase, IMAP family member 3 (GIMAP3) and GLI pathogenesis-related 2 (GLIPR2) are pro-viral proteins which facilitate virus multiplication resulting in enhanced JEV titer.
2

Návrh a tvorba laboratorní úlohy s Peltierovým článkem / Design and construction laboratory exercise with Peltier cell

Mejzlík, Michal January 2009 (has links)
The introduction of this paper describes three thermoeletrical effects and their properties. It also deals with thermoelectrical cells, which are using Seebeck´s and Peltrier´s effects. The paper decribes principles how the Peltier´s cells work, their mathematical model, construction and practical use. The paper shows what kinds, shapes and output we can meet at the market and which kinds of parameters regulate their selection. The paper suggests the possibility to measure characteristic behaviour and quantity during laboratories tasks and their evaluations. At the conclusion is adduced the suggestion of laboratory task together with theoretically made pilot protocol.
3

Měření rychlosti vozidla / Car speed measurement

Vořechovský, Karel January 2011 (has links)
Car speed measurement using the Doppler effect
4

Ultrazvukový měřič rychlosti toku krve / Ultrasound blood flowmeter

Mojžíš, Karel January 2016 (has links)
This master's thesis is concerned with the basis of ultra-acoustics and it explains the application of Doppler effect in medicine as a diagnostic method used for measuring blood flow velocity in blood vessels. The thesis also presents Doppler systems used for diagnostic purposes. It describes the principles of these systems, shows accompanying flowcharts and explains the function of these systems. There is also included the system design of the whole ultrasonic blood flow velocity meter. The system has been designed for the specified parameters with continuous 4 MHz operating frequency, generated intensity of ultrasound 100 mW/cm^2 and diameter D-shaped transmitting transducer 8 mm. In the design of personal solution there are described all the function blocks of the ultrasonic meter. There is also described the choice of appropriate components and designed all the required supply voltages. All the function blocks of the system are experimentally verified. The system has been designed with acoustic intercept and the resultant velocity curves are displayed on software oscilloscope on PC.
5

Elektronové vlastnosti substituovaných cérových sloučenin / Electron properties of the substituted cerium compounds

Klicpera, Milan January 2015 (has links)
Title: Electron properties of the substituted cerium compounds Author: Milan Klicpera Department: Department of Condensed Matter Physics Supervisor: doc. Mgr. Pavel Javorský Dr. Abstract: The subject of this work is the study of vibron states in tetragonal CeCuAl3 and CePd2Al2 compounds and their development with the substitution of constituent elements. After the preparation of single crystals and polycrystalline samples, the careful chemical and structural characterization was done. The structural, magnetic and superconducting phase transitions in samples were observed and thoroughly investigated. The crucial experiments were performed using the elastic and inelastic neutron scattering techniques leading to the refinement of magnetic structures in CeCuAl3, CePd2Al2 and CePd2Ga2. The energy spectra of substituted Ce(Cu,Al)4 and CePd2(Al,Ga)2 compounds were studied as well allowing to determine the crystal field excitations and their interaction with phonons (vibron states) in these materials. Keywords: cerium internetallic compounds, vibron states, electronic properties, neutron scattering
6

Ultrarychlá laserová spektroskopie antiferomagnetů / Ultrafast laser spectroscopy of antiferromagnets

Saidl, Vít January 2018 (has links)
This work is dedicated to the study of two antiferromagnetic materials that are suitable for use in spintronic devices. In series of FeRh samples we studied the transition temperature between the antiferromagnetic and ferromagnetic phases. We developed a method based on material optical response for a quick determination of this temperature, which enabled us to study with a spatial resolution of 1 μm a magnetic inhomogeneity of prepared samples.We also developed a method for a determination of the Néel temperature and the magnetization easy axis position in thin films prepared from compensated antiferromagnetic metal. We successfully applied this method on an uniaxial sample of CuMnAs and we discussed its applicability for a research of samples with a biaxial magnetic anisotropy.
7

Analýza nekardiálních nežádoucích jevů pulzní terapie kortikoidy / Analysis of non-cardiac adverse event of glucocorticoid pulse therapy

Polláková, Lenka January 2019 (has links)
5 ABSTRACT Candidate: Lenka Polláková1 Supervisor: prof. RNDr. Jiří Vlček, CSc.1 Consultant: doc. MUDr. Tomáš Soukup, Ph.D.2 1 Department of Social and Clinical Pharmacy, Faculty of Pharmacy in Hradec Králové, Charles University 2 2nd Department of Internal Gastroenterology, University Hospital in Hradec Králové Title of the master thesis: Analysis of non-cardiac adverse event of glucocorticoid pulse therapy Intravenous glucocorticoid pulse therapy (PT GC) is effective in life threatening flares of rheumatic diseases. However, due to GC's pleiotropic effect, higher doses and additive nongenomic mechanism in pulse regimen, it is not free of complications (1). The aim of theoretical part was to describe from literature research the relevance of PT GC, its non- cardiac adverse events (AE) in rheumatic patients and their influencing factors. The aim of experimental part of the study was to analyze the occurrence of non-cardiac AE in real-life setting, analyze risk factors of potential adverse drug reactions (ADR) and its complications and analyze the risk minimalization management in real-life setting. Patients were administered 1000 mg methylprednisolone in 3 to 5 doses on alternating days. Analysis includes 277 rheumatic patients with 325 pulse therapy courses. Data were collected retrospectively from their...
8

Vývoj nanovláknového PVDF senzoru / Development of PVDF nanofibers sensor

Klásek, Matyáš January 2020 (has links)
This diploma thesis deals with the feasibility of using PVDF nanofibers as an active sensor layer generating electrical signal. PVDF and related electromechanical effects are described. A research study is conducted regarding existing PVDF nanofiber applications and based on it, an event sensor design utilizing triboelectric effect and electrostatic induction is proposed. The electrical response of the layers is experimentally investigated and a pulse detection algorithm is conceived and implemented. Finally, a way of integrating the sensor into a rail track is proposed.
9

Různé způsoby využití slunečního záření pro výrobu elektrické energie / Different way how to use solar radiation for the electric energy production

Obadal, Petr January 2011 (has links)
The thesis deals with the problem of potential use of solar energy through the conversion into electric energy. The thesis analyses in great detail several types of conversion. My special concern included photovoltaic conversion and thermal conversion of solar energy using steam turbines for energy production. In the subsequent parts, I focus on the problem of photovoltaic, photovoltaic systems, and solar thermal power plants, their installation and use.
10

Optimalizace tvaru paralelních proudovodných drah odpojovače / DISCONNECTOR PARALLEL CURRENT PATHS OPTIMIZATION

Görig, Tomáš January 2015 (has links)
The objective of this master´s thesis is diagnostic the actual disconnector current path that is unevenly stressed by nominal current. The most stressed parts are excessively heated. In next part are projected a few options to optimize the current path. The options are verified by simulation. The best option is recommended to the submitter.

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