Mobbing

Diplomová práce se zabývá jedním z rafinovaných druhů šikany na pracovišti, kterým není nic jiného než mobbing. Mobbing je považován za neúnosný psychoteror na pracovišti. V teoretické části jsou vymezeny stěžejní pojmy: agrese,agresivita, šikana a mobbing. Praktická část obsahuje kvantitativní výzkumné šetření s kvalitativní interpretací.Cílem práce je zmapovat výskyt mobbingu ve zvolené oblasti a informovanost zaměstnanců o této problematice.ObhájenoThis thesis deals with one of the refined kind of bullying in the workplace, which is nothing more than mobbing. Mobbing is considered intolerable psychological terror at the workplace. In the theoretical part are defined by the principal terms: aggression, aggressiveness, bullying and mobbing.The practical part contains quantitative research with qualitative interpretation. The aim is to map the occurrence of mobbing in the selected area and the awareness of employees on this issue

Releasing of the solubilized substances from the phase-separated hydrogels

Tato bakalářská práce se zabývá uvolňováním solubilizovaných látek z fázově separovaných hydrogelů. Cílem práce je stanovit jejich solubilizační kapacitu. Hydrogely byly připraveny na základě interakce záporně nabitého polymeru (hyaluronan) a kladně nabitého tenzidu (Septonex) a byly připraveny dvěma možnými způsoby, tzv. „mokrou“ a „suchou cestou“. K solubilizačním experimentům byl použit fluorescein a akridinová oranž, jakožto fluorescenční sondy. K určení, zda se z hydrogelu dané látky uvolňují nebo ne, byla primárně použita metoda UV-VIS spektrofotometrie, kdy jednotlivá měření probíhala po 24, 48 a 72 hodinách od doby jejich přípravy. Tato metoda se ale později ukázala jako nevhodná a nepřesná z důvodů vzniku zakalených supernatantů nad vzniklými gely a nízkých koncentrací fluorescenčních sond v tomto roztoku. Z těchto důvodů byla zvolena metoda měření na základě fluorescence těchto sond pomocí přístroje MicroTime 200. Jedná se o velice přesný přístroj, proto výsledky z tohoto měření byly brány jako relevantní. Výsledky byly shrnuty na základě použití fluorescenčních sond, kdy bylo prokázáno, že fluorescein jako záporně nabitá molekula se uvolňuje podstatně méně než akridinová oranž.This bachelor thesis is focused on releasing of the solubilized substances from the phase separeted hydrogels. The aim of this work is to determine the solubilization capacity of these hydrogels. Preparation of them were based on interaction between hyaluronan and cationic surfactant carbethopendecinium bromide. Hydrogels were prepared by two possible ways, „wet“ and „dry way“. For solubilization experiments were used fluorescein and acridine orange as fluorescent probes. Primarily UV-VIS spectrophotometry was used to determine if these probes are released form hydrogel or not. Hydrogels were monitored after 24, 48 and 72 hours from their preparation. But this method proved to be inappropriate and inaccurate, because of cloudy supernatants over the hydrogels and also because of very low concentrations of fluorescent probe in this solution. For these reasons instead of this metod was used method, which is based on fluorescence. The instrument is called MicroTime 200. It´s very accurate method and results of this are considered like relevant. It was proved that fluorescein as a negatively charged molecule is released less than acridine orange.

Study of UV-generated fluorescent zinc complexes by fluorescence spectroscopy

Tato diplomová práce se zabývá studiem UV světlem generovaných fluorescenčních komplexů zinku s kadmiem a organickými molekulami SAM, SAH, CYS, HCYS a GSSG, konkrétně při vlnové délce 375 nm. Dále je cílem práce prekurzory spektrálně a temporálně charakterizovat před a po ozáření v transiluminátoru při vlnové délce 250 nm. Studium geneze fluorescenčních komplexů bylo provedeno pomocí metody FLIM. Díky této metodě bylo zjištěno, že ke tvorbě zmiňovaných komplexů dochází jen u prekurzorů Zn:SAH, Zn:GSSG a Zn:Cd, a že na tuto tvorbu má značný vliv způsob přípravy. Spektrální charakteristika byla provedena na fluorimetru, kde byl očekáván nárust intenzity fluorescence u ozářeného roztoku s prekurzory. Jednalo se o zakalené roztoky, kde byla pozorována sedimentace částic, se kterou docházelo ke změně intenzity fluorescence. U vzorku Zn:SAM a Zn:CYS docházelo se sedimentací ke zvýšení intenzity, naopak u Zn:SAH a Zn:HCYS docházelo k jejímu snížení. Roztok s prekurzory Zn:Cd byl čirý, a tak nedocházelo k žádné změně intenzit. Zn:Cd vykazoval nejlepší spektrální vlastnosti, naopak nejhůře se jevil vzorek se Zn:SAM, jehož excitační a emisní maxima se nacházejí velmi blízko sebe. Vzorek s prekurzory Zn:CYS a Zn:HCYS vykazoval téměř stejné výsledky spekter a příslušných maxim. Na základě charakteristiky dle dob života metodou TCSPC se nejlépe choval vzorek se Zn:CYS, Zn:HCYS a Zn:GSSG, které vykazovaly 3 doby života. U vzorku se SAM a SAH nebylo možné jednoznačně určit doby života. Zn:Cd vykazoval 4 doby života.This thesis focuses on the study of UV light-generated zinc complexes with cadmium and organic molecules SAM, SAH, CYS, HCYS and GSSG, specifically at 375 nm. Furthemore, the aim of the work is to characterize the precursors spectrally and temporally before and after irradiation in the transilluminator at 250 nm. Study of genesis these complexes was performed by FLIM. Thanks to this method, it was found that the formation of complexes occurs only with Zn:SAH, Zn:GSSG and Zn:Cd. The formation of complexes is influenced by the method of preparation. The spectral characteristic was performed on a fluorimeter where the increase in fluorescence intensity of the irradiated solution with the precursors was expected. These were turbid solutions where sedimentation of the particles was observed and the intensity of fluorescence was changed. In the Zn:SAM and Zn:CYS sample, the sedimentation increased in intensity, while in Zn:SAH and Zn:HCYS decreased. The Zn:Cd precursor solution was clear and there was no change in intensity. Zn:Cd showed the best spectral properties, while the Zn:SAM sample, whose excitation and emission maxima are very close to each other, appeared to be the worst. A sample with Zn:CYS and Zn:HCYS showed almost the same spectra and respective peak results. Based on lifetime characteristics by TCSPC, the sample with Zn:CYS, Zn:HCYS and Zn:GSSG, which showed 3 lifetimes, was best treated. Lifetime could not be unambiguously determined for SAM and SAH samples. Zn:Cd had 4 lifetimes

UV-Induced Nanoparticles-Formation, Properties and Their Potential Role in Origin of Life

Inorganic nanoparticles might have played a vital role in the transition from inorganic chemistry to self-sustaining living systems. Such transition may have been triggered or controlled by processes requiring not only versatile catalysts but also suitable reaction surfaces. Here, experimental results showing that multicolor quantum dots might have been able to participate as catalysts in several specific and nonspecific reactions, relevant to the prebiotic chemistry are demonstrated. A very fast and easy UV-induced formation of ZnCd quantum dots (QDs) with a quantum yield of up to 47% was shown to occur 5 min after UV exposure of the solution containing Zn(II) and Cd(II) in the presence of a thiol capping agent. In addition to QDs formation, xanthine activity was observed in the solution. The role of solar radiation to induce ZnCd QDs formation was replicated during a stratospheric balloon flight

Use of subjunctive/indicative with probability operators (quizás in non-inicial position) in European Spanish.

This bachelor's thesis is based on statistical research which verify the use of indicative and subjunctive with probability operator quizás in non-inicial position in European Spanish. The thesis is divided into two main parts. The first section offers theoretical background for the research section. The theoretical section is focused on clarification of problems connected with the use of grammatical moods and tenses, conception of modality and role of operators. The second, practical section of the thesis consists in statistical analysis which has been realized by the use of corpus CREA of the Royal Spanish Academy. The aim of the research is to find out real status of using indicative and subjunctive with operator quizás. The investigation is separated into five genres in the period from 1990 to 2004. The results are presented in charts and tables that provide a picture of the frequency of using both grammatical moods

Study of interaction of charged catanionic vesicles with oppositely charged polyelectrolytes

The presented dissertation is focused on positively charged catanionic vesicles and their interactions with oppositely charged hyaluronan. The catanionic vesicles were composed of ion pair amphiphile of hexadecyltrimethylammonium-dodecyl sulfate (HTMA-DS), a positively charged double-chain surfactant that electrostatically stabilized the vesicles and cholesterol. Cholesterol may strongly affect the physico-chemical properties of the vesicles, therefore it was necessary to determine its optimal amount in the membrane. Especially, the size and stability of vesicles were studied by dynamic and electrophoretic light scattering, membrane microviscosity by fluorescence anisotropy and hydration of the outer part of the membrane by generalized polarization. It was found that vesicles show ideal properties at a cholesterol content about 40 mol.%. These catanionic vesicles interacted with hyaluronan regardless of its molecular weight. Visible aggregates were observed around their isoelectric point, but they disintegrated with increasing polymer concentration. However, this decay was different for different hyaluronan molecular weights. An increase in ionic strength, or more precisely concentration of sodium chloride above 25 mM had a destabilizing effect on both uncoated and hyaluronan coated vesicles. It was also interesting that increasing the ionic strength affected the microviscosity of the membrane, which became more fluid, but there were no significant changes in the hydration of its outer part. The presented work is also focused on the preparation and characterization of a new type of catanionic vesicles, where the cationic surfactants HTMAB was replaced by Septonex. The same methods were chosen for their characterization as in the case of the HTMA-DS vesicles. This exchange of surfactants had a major effect on the resulting properties of the vesicles, which are stable even at very low cholesterol content. In accordance with long-term stability, a suitable concentration of cholesterol was chosen from 15 mol.% and higher

Expression of epistemic modality in Spanish news texts in comparison with Czech texts.

The core of the present master's thesis is a comparative analysis of means of expressing epistemic modality on the background of Spanish and Czech journalistic texts. Initially, the discourse analysis and the concept of theory of enunciation are presented. Secondly, the author defines the term modality and its concept in terms of modal logic and linguistics. She concentrates on different typologies of modality presented by foreign and Czech authors as well. Further, the works focuses on the category of evidentiality and means of expression (especially lexical) of epistemic modality. The proper research is based on qualitative and quantitative analysis. The aim of this investigation is to compare the frequency of occurrence of the epistemic markers between the aforementioned languages

Newly synthesized permanently positively charged monosubstituted beta-cyclodextrin derivatives as chiral selectors in capillary electrophoresis.

This diploma thesis deals with the application of two permanently positively charged monosubstituted β-cyclodextrin derivatives (PEMEDA-β-CD, PEMPDA-β-CD) as chiral selectors in capillary electrophoresis. Use of PEMPDA-β-cyclodextrin in capillary electrophoresis has not been reported in literature. Properties of PEMEDA-β- cyclodextrin are already known, but its application for separation of amino acid enantiomers has not been published yet. Cyclodextrin derivatives were tested as additives in different buffers of different pH and with eventual addition of organic modifier. As suitable background electrolyte 15 mmol·l-1 borate buffer, pH = 9.5 without organic modifier was chosen. Furthermore the influence of chiral selector on separation and eventual enantioseparation of chosen analytes was evaluated. Addition of cyclodextrin derivatives in concentration range 0.0 - 5.0 was tested. Fourteen anionogenic analytes, including native amino acids, N- blocked amino acids and profens, were detected with UV-VIS detector at optimal wavelength 214, 254 or 280 nm. Both chiral selectors were suitable for enantioseparation of N-boc-D,L-tryptophan, which was baseline separated at concentration of selector as low as 0.5 mmol·l-1 . Tested amino acids blocked with terc-butoxycarbonyl and D,L-ketoprofen were partially..

Financing of the Czech Television on the Threshold of the Third Millennium

Import 01/09/2009Prezenční121 - Katedra ekonomické žurnalistikyvelmi dobř