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The comparison of the performace of carbocyanine dyes disC3(3) a diSC3(5) in fluorescent probing of yeast cell membrane potential.
Matunová, Petra ; Plášek, Jaromír (advisor) ; Krůšek, Jan (referee)
Membrane potential represents a voltage across a membrane and it is an important parameter that helps to describe processes in cells. Carbocyanine fluorescent probes diS-C3(3) and diS-C3(5), for which a common short chemical name 3,3'- dipropylthiadicarbocyanine iodide is used, are suitable for monitoring membrane potential changes of cells in which microelectrodes can not be used because of a small size of the cells. These changes can be measured on the scale of mV. A spectral analysis of cell suspensions containing a fluorescent probe makes it possible to determine the ratio of extracellular and intracellular concentrations of the probe. Using it we can calculate the value of membrane potential changes which can be induced by an outer stimulus. This Bc. thesis presents a comparison of the rate of accumulation of the above mentioned fluorescent probes in yeast cells, as well as experiments aimed for studying an inuence of different substances and their various concentrations on free and bound component of the dye.
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Spatially separated HOMO/LUMO at interface of polypyrrole physisorbed on oxidized nanodiamond facets
Matunová, Petra ; Jirásek, Vít ; Rezek, Bohuslav
Nanodiamond particles (NDs) have recently risen in popularity owing to their unique and perspective properties. Merging NDs with organic molecules, such as polypyrrole (PPy), into hybrid organic-semiconductor functional systems gives rise to potential applications in photovoltaics (PV), which is supported by prior experimentally observed charge transfer between bulk diamond and PPy. This work focuses on the most relevant (111) and (100) O-terminated ND facets with different coverage of surface terminating oxygens in ether, epoxide, ketone, and peroxide positions. We use density functional theory (DFT) computations employing B3LYP functional and 6-31G(d) basis set. Energetically the most favorable oxidized ND facets were further optimized with PPy in physisorbed configurations. Analysis of geometry, binding energy, HOMO-LUMO gap, and charge transfer was done on the relaxed PPy-ND structures. Multiple hydrogen bonds are formed between PPy amino groups and O atoms on ND surface.
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Studium termodynamických a kinetických parametrů interakcí oligomerních modelů DNK s organokovovými komplexy aktivními v protirakovinné léčbě stanovených metodami kvantové chemie a kombinovanými QM/MM metodami
Matunová, Petra ; Burda, Jaroslav (advisor) ; Sochorová Vokáčová, Zuzana (referee)
It has been proven that platinum and ruthenium complexes are active in anti- cancer treatment. Nowadays, the common chemotherapeutica have a lot of side effects, therefore, drugs with fewer negative impacts are intensively searched for. The first part of the thesis focuses on the study of cis-[Pt(NH3)2Cl2] (cisplatin, DDP) and four platinum potential anticancer agents PtCl2(diaminocyclohexane), PtCl2(NH3)(cyclohexylamine) (JM118), cis-[PtCl2(NH3)(piperidine)] and trans-[PtCl2(NH3)(thiazole)]. Thermodynamic and kinetic parameters of reac- tions of these complexes in semi-hydrated and fully-hydrated form with guanine were studied using QM methods. The reaction with guanine is the key process ini- tiating the anticancer activity. Analyses of electron density were performed at the B3LYP/6-311++G(2df,2pd) level of theory in IEF-PCM model. The second part of the thesis studies the reaction of the so-called 'piano stool' Ru(II) transition metal complex, [Ru(II)(η6 -p-cymene(nalidixic acid)(H2O)]2+ , first with guanine using QM methods and second with ds-DNA model using QM/MM methods. The reaction site, which is described by QM method, is two consecutive guanines and the Ru(II) complex. Analyses of thermodynamic and kinetic parameters, and electron density were performed at the B97D/6-31G* level of theory. All the...
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The comparison of the performace of carbocyanine dyes disC3(3) a diSC3(5) in fluorescent probing of yeast cell membrane potential.
Matunová, Petra ; Plášek, Jaromír (advisor) ; Krůšek, Jan (referee)
Membrane potential represents a voltage across a membrane and it is an important parameter that helps to describe processes in cells. Carbocyanine fluorescent probes diS-C3(3) and diS-C3(5), for which a common short chemical name 3,3'- dipropylthiadicarbocyanine iodide is used, are suitable for monitoring membrane potential changes of cells in which microelectrodes can not be used because of a small size of the cells. These changes can be measured on the scale of mV. A spectral analysis of cell suspensions containing a fluorescent probe makes it possible to determine the ratio of extracellular and intracellular concentrations of the probe. Using it we can calculate the value of membrane potential changes which can be induced by an outer stimulus. This Bc. thesis presents a comparison of the rate of accumulation of the above mentioned fluorescent probes in yeast cells, as well as experiments aimed for studying an inuence of different substances and their various concentrations on free and bound component of the dye.
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