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Self-assembly and excited energy transfer in bacteriochlorophyll aggregates
Pospíšil, Petr ; Pšenčík, Jakub (advisor) ; Vácha, František (referee)
Bacteriochlorophyll c (BChl c) belongs among photosynthetic pigments. It is found in lightharvesting complexes of green photosynthetic bacteria in the form of self-assembled aggregates. It is possible to prepare BChl c aggregates also in vitro in aqueous solutions, in the presence of certain non-polar molecules (e.g. lipids or carotenoids). In this work, artificial light-harvesting antenna was prepared composed of BChl c and selected azulene derivative. The aggregation of BChl c with azulene enhances the absorption in the near UV region compared to BChl c. Fluorescence spectroscopy was used to study an efficiency of energy transfer from azulene to BChl c. The procedure used was based on fluorencence excitation spectra measurement, and a comparison with absorption 1-T spectra. The measurements were complicated by anomalous fluorencence of azulene, which occurs from the S2 state. Furthermore, the reference diode in the fluorescence spectrometer did not correct properly the signal in the near UV region, where azulene absorbs. The problem was partially solved by preparing the new correction files using selected laser dyes. Excitation spectra demonstrate the presence of the energy transfer from azulene to BChl c, however, it was not yet possible to satisfactorily quantify its efficiency.
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Energy metabolism of the Prague city
Fikar, Pavel
2 Abstract City is complex urban system. In human society city is biggest energy dissipative structure. Therefore it is important to understand how energy flows in to city, what main energy carriers are and what total energy requirements are. Prague was chosen as a model city for this case study. Prague is modern city, capital of the country housing, employing, accommodating and entertaining more than one and half million people daily. There are some significant differences between average country energy consumption and Prague energy consumption. Prague is touristic centre and destination of many travellers that come to country. Also Prague lack high concentration of heavy industry. There are very few electricity producers, most of time small entertainment or producers electricity from alternative fuels (e.g. central water treatment facility) and most of electricity is transported to Prague from other regions. Heat is produced from primary fuels centrally, but there is significant flow of heat through heat pipe from other regions. This diploma thesis presents results of the case study on Prague energy metabolism. There were accounted primary energy fuels (coal, oil, gas) as well as their derivates (e.g. fuel for cars driving in Prague) and final energy use. To do proper analysis of particular component of...
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Evaluation of activity of potentional antifungal substances through the use of microdilution broth method I.
Nitraiová, Jindřiška ; Paterová, Pavla (referee) ; Vejsová, Marcela (advisor)
1. Abstract Jindřiška Nitraiová Evaluation of activity of potentional antifungal substances through the use of microdilution broth method I Diplomová práce Univerzita Karlova v Praze, Farmaceutická fakulta v Hradci Králové Farmacie The aim of the thesis was a screening of activity of new potentional antifungal substances. For testing of substances was used the microdilution broth method. This method allows a routine assesment of MIC of a larger amount of antimycotics and also complete strains. The compounds for the strains Candida albicans, C. tropicalis, C. glabrata, C. krusei, Trichosporon beigelii, Aspergillus fumigatus, Absidia corymbifera a Trichophyton mentagrophytes were tested. The derivates of pyrazinedicarbamide, pyrazinedicarbothioamide, pyrazole-1- carboxylate, hydrazinecarboxylate, diazene-1,2-dicarboxamide and cyclohexanone did not show any antimycotic effectiveness. On the contrary the derivates of benzamide and benzenecarbothioamide showed a good antimycotic activity against all the testing strains. In the group of other substances, it means the derivates of pyrazinecarboxamide, pyrazinecarbothioamide, pyrazine-anilides, pyrazine-2-amine, pyrazine-2-carbohydrazide and pyrazine-2,5-dicarbonitrile and thiazolidine-4-one, some substances were effective but some had no effect. The derivates of...
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