|
| |
|
|
Design of the electron microscope
Švajdová, Anna ; Surman, Martin (referee) ; Škaroupka, David (advisor)
The theme of this diploma thesis is the design of a scanning electron microscope with a focused ion beam. Specifically, the thesis is focused on the design of the microscope covers and the adjacent workplace of the operator for Tescan Orsay Holding a.s.. Design is solved as the first proposal aimed at future innovation of the design of the entire product line.
|
|
|
The diagnosis of pulmonary tuberculosis
CHALOUPKOVÁ, Lenka
Even in 21st century tuberculosis (TBC) pose a significant medical and social problem. Open borders intensified migrations, expansin of AIDS pandemic and related increase of patients with reduced immunity are all reasons why tubercuosis still remains one of the main causes of death all over the world. The disease originator is Mycobacterium tuberculosis, an acidoresistent bacteria that is able to survive in a human organism for a lot of years. Symptoms of the disease are not characteristic, that is why the correct diagnosis is essential to reveal the new cases of the disease. One of the standards to stay is bacteriological examination based on microscopic examination and cultivation of the material. Also rapid molecular genetic techniques and methods based on the immune response are availabe. This work uses data gaied from Plicní léčebna Nemocnice České Budějovice, a.s. (Pulmonary Department of Hospital in České Budějovice) for the period of 2008-2016, as well as data gained from Pracoviště imunologie (Immunolgy Department) in Nemocnice České Budějovice, a.s. The goal of the work was to create a statistical overview of patients with confirmed pulmonary tuberculosis according to age and gender for the period of 2008-2016 . Next it aims at comparison of tuberculin skin test and quantiferon test in patients with pulmonary tuberculosis for the period of 2008 - 2016. Implementation and evaluation of the quantiferon test in patients in 2016 are the end of my work. The methodology was mainly based on gathering the necessary data and their evaluation. Results show that pulmonary tuberculosis was confirmed in 81 patients in relation to data obtained from the Pulmonary Department. Of that 75% were male and only 25% female. For both sexes, the occurrence of tuberculosis was on record in all age categories. In men most often at the age of 31-50 and 51-70. Tuberculin skin test (PPD) and quantiferon (QF) test were also accomplished in 62% of patients. Only in 7% patients none of the tests was done. When the two tests were compared, both PPD and QF tests were positive in 64%. Also the results show that the quantiferon test is more sensitive than the tuberculin skin test. The quantiferon test was evaluated separately for the positive and negative results, positive result was compared with bacteriological examination. Next the QF test was evaluated from the point of view of gender, age, diagnosis and engaged department. A relatively signifcant finding was that even though the QF test is more sensitive, for more than a third of patients with the positive QF test result, mycobacterial identification was not required at all. Compared to bacteriology examination TB was cofirmed in 14% of patients. Despite the fact that the Czech Republic ranks among the countries with a low incidence of tuberculosis, this fact can not be underestimated. The public's feeling that there is no need to worry about this illness has also been supported by the approval of the cancellation of flat vaccinations, effective from 1. 11. 2010. Also, a number of physicians are no longer taking this disease into account while making diagnosis. However, education of lay public is essential above all in this issue.
|
|
|
Dynamic saturation optical microscopy using photoswitchable proteins
Kolářová, Marie ; Benda, Aleš (advisor) ; Obšil, Tomáš (referee)
Fluorescence microscopy is an essential technique for live cell imaging. One of its drawbacks is a rather low diffraction limited spatial resolution, which is described by Abbe diffraction law. Therefore, in the last decade a lot of new methods improving spatial resolution were developed. One of them is dynamic saturation optical microscopy (DSOM) that is based on spatial monitoring of reversible transition kinetics between bright and dark states of fluorophores. The dark state is possible to obtain for example by using reversibly photoswitchable fluorescent proteins such as Dronpa and its variants. These proteins undergo reversible transition from fluorescent to nonfluorescent state after irradiation by blue and ultraviolet light. In my work I focus on employing the kinetics of controllable photoswitching of Dronpa in improving the overall image quality, including the spatial resolution. The experiments were performed on yeasts expressing selected proteins labelled with Dronpa. Firstly, photoswitching behaviour of Dronpa was confirmed. Secondly, experimental conditions were optimized by studying dependence of switching rate on laser intensities and on excitation wavelength and by studying protein photostability. Experiments were performed on different timescales and for various proteins. Using the optimal...
|
|
|
Relationship between macro- and microscopic sings of alkali-silica reactivity in concrete
Burdová, Anna ; Přikryl, Richard (advisor) ; Martinec, Petr (referee)
This thesis deals with deterioration observed in cement-concrete cover (CBK) for three selected road sections of highways in the Czech Republic. The main objective was to determine whether concrete failure arose due to alkali-silica reaction, or other mechanism. The deterioration of concrete failure was observed in the macroscopic and microscopic scale. The mostly macroscopically observed deterioration of the concrete were cracks breaking the surface and inner parts of concrete. In micro- scale the microcracks and alcali-silica gels were observed. The CBK deterioration was quantitatively determined by three main parameters: specific length of microcracks on the CBK surface, specific length of microcracks in the drill cores and volume of alcali-silica gels and microcracks in thin sections. According to these indicators it was possible to distinguish two different types of CBK deteriorations. (1) Degradation mainly associated by alkali-silica reaction (observed on highways D11 - Vrbová Lhota and D1) and (2) degradation connected with another mechanism (cycles of freezing and thawing, mechanical degradation) was observed on the highway D5.
|
|
|
Preparation of ultra sharp tips for STM TERS applications
Šilhan, Lukáš ; Man, Ondřej (referee) ; Jan, Vít (advisor)
The goal of this bachelor thesis is preparation of Au tips by electrochemical etching. The theoretical part deals with comparison of microscopy techniques for materials surface characterization and Raman spectroscopy. The experimental part is focused on the settings of optimal etching parametres to gain appropriate geometry of fabricated tips. Function of tips is verified by evaluation of data gained by experimental measuring with this tips. Prepared tips are suitable for applications such as STM and TERS.
|
|
|
Three-Dimensional Reconstruction of Image in Digital Holographic Microscopy
Týč, Matěj ; Karásek,, Vítězslav (referee) ; Martišek, Dalibor (referee) ; Chmelík, Radim (advisor)
This thesis deals with the topic of 3D image processing for digital holographic microscopy - numerical refocusing. This method allows to perform mathematically accurate defocus correction on image of a sample captured away from the sample plane and it was applicable only for images that were made made using coherent illumination source. It has been generalized to a form in which it is also applicable to devices that use incoherent (non-monochromatic or extended) illumination sources. Another presented achievement concerns hologram processing. The advanced hologram processing method enables obtaining more data mainly concerning precision of quantities from one hologram — normally, one would have to capture multiple holograms to get those. Both methods have been verified experimentally.
|
|
|
Three-dimensional reconstruction of image in digital holographic microscopy
Týč, Matěj ; Chmelík, Radim (advisor)
This thesis deals with the topic of 3D image processing for digital holographic microscopy - numerical refocusing. This method allows to perform mathematically accurate defocus correction on image of a sample captured away from the sample plane and it was applicable only for images that were made made using coherent illumination source. It has been generalized to a form in which it is also applicable to devices that use incoherent (non-monochromatic or extended) illumination sources. Another presented achievement concerns hologram processing. The advanced hologram processing method enables obtaining more data mainly concerning precision of quantities from one hologram — normally, one would have to capture multiple holograms to get those. Both methods have been verified experimentally.
|
|
|
Design of electron microscope
Havlíček, Petr ; Kobosil, Karel (referee) ; Zvonek, Miroslav (advisor)
The aim of my Master's thesis is the design of a scanning electron microscope. The designed concept presents an innovative approach to the problems and respects all technical, ergonomic and aesthetical demands made on it. The main creative part of design process starting from the concept development and ending up with the final solution is preceded by a background research study including a historical, technical and design analysis of the electron microscope. The conclusion of my Master's thesis analyses the final design, its character and its contribution in broader context.
|
|
|
Accuracy of measurement on workshop microscope
Pernikář, Václav ; Jarošová, Jana (referee) ; Bumbálek, Leoš (advisor)
This thesis deals with the performance of the measurement accuracy in the optical measuring systems. The first part describes basic principles of metrology and the guidelines of the expression of uncertainty and the factors which influence measurement result. The second part classifies optical measuring systems and describes some measuring principles of them. The final part compares two optical gauges and the evaluation of some of their characteristics through the use of very simple experiments.
|
guest ::
