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An Environmental Impact of Pyritic Bauxite from the Dajti Mine, Albania
Novák, Jiří Karel ; Minařík, Luděk ; Peza, Luftulla Hasan ; Melka, Karel
The accelerated chemical weathering of bauxite due to acid atmospheric deposition and breakdown of pyrite was simulated using short-termed laboratory acid leaching at 20 o C. Pyrite-bearing gibbsite-boehmitic bauxite giving rise to a number of questions concerning ecology was tested along with oxic boehmitic bauxite from the Dajti mine and that from Mali Korites (Mali Thate Mts., SE Albania). The leachte of pyrite-bearing and sulphate-producing bauxite is enriched in the following risk elements: Cd, Be, Zn, Ni, Co, and much less Cr, Cu, As, and Pb. Toxic soluble hydroxy-alumina ions may be also released into the aquatic environment, because of high concentration in output leachate (563 mg/l). In contrast, the leachates of oxic boehmitic bauxites commonly contain much lower concentrations of toxic elements with exception of Cu (Dajti mine) and Be (new occurence of Mali Korites).
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Laboratory preparation of inorganic compounds
FRANTOVÁ, Jana
``Laboratory preparation of inorganic compounds{\crqq} is the fourth part of web-based data-base of chemical experiments. This compartment is suitable especially for secondary and high schools. Fifteen experiments are presented in total (on internet from December 2006). Didactic elaboration includs clips, instructions and principles of experiments. Teaching aplications are suggested by questions and tasks. http://home.zf.jcu.cz/public/departments/kch/didaktika/didaktika.htm
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Identification and elimination of the risk that can endanger nurses during their professional performance
CHARVÁTOVÁ, Lenka
Theoretical background Employment in the health service brings about a number of risks that are specific of respective health facilities and their departments. Nurses should be informed about all possible risks resulting from their nursing practice, as well as about ways to eliminate these risks because this is the only way they can protect themselves and by suitable means and procedures. Performing their work, nurses are exposed to four main areas of risk factors. These concern especially the effects of mental and physical strain, chemicals and biological factors. Objective of my thesis The objective was to test nurses' knowledge of risks and to test how well they can eliminate these risks. Apart from that, the thesis endeavours to find out whether the risks in nurses' work change in relation to the field of care provided. Hypotheses H1 Nurses know the risks resulting from their nursing practice. H2 Risks in nurses' work vary in relation to the field of care. H3 The most common risk occurring in nurses' occupation is the puncture wound caused by a needle. H 4 Nurses are acquainted with manners to eliminate risks resulting from the performance of their occupation. Methodology To test nurses' knowledge, I compiled a questionnaire focused on surveying the knowledge in the field of risks and elimination of these risks. The questionnaire was arranged in two basic groups. The first group was focused on the knowledge of risks and occurring injury in the performance of the occupation (the puncture wound by a needle). The other group was focused on the area of eliminating the risks. The research was carried out in medical facilities in the Region of South Bohemia. Altogether, 417 nurses were addressed. The following sections were chosen in a haphazard fashion: pulmonary, surgical, internal and a neurological departments, department of subsequent care and the intensive care unit. All the results obtained were statistically processed in the Excel programme from the Microsoft Office software packet. I used a graphic depiction to interpret the outcomes. Outcomes It was found out in the first area of the outcomes that nurses are acquainted with the risks of their occupation (knowledge of risk behaviour, when handling loads, when working with chemicals, when handling oxygen cylinders, treating an aggressive client). The second area of the outcomes was essential for establishing the ways to eliminate risks (the nurses proved knowledge of risks and duties, the duty to participate in creating a safe environment , compulsory preventive medical examinations, knowledge of risk behaviour, using personal protective equipment, observing the work principles and procedures, knowledge of treating contaminated laundry, oxygen cylinders and immobile clients, disinfection of hands, treating an aggressive client). The third area yielded an answer to the question whether puncture wounds caused by needles ranked among the most frequent risks in the occupation of the nurse. The last area was essential to establish the variability of risks depending on the field of care provided. It was found out, that risks varied in relation to the field of care provided, while the nurses viewed the mental and physical strain as the most significant risk in the performance of their work. H1 - Nurses know the risks resulting from their nursing practice - was confirmed, H2 - Risks in nurses' work vary in relation to the field of care provided - was confirmed, H3 - The most common risk occurring in nurses' occupation is the puncture wound by a needle - was confirmed, H4 - Nurses know ways to eliminate risks resulting from the performance of their occupation - was confirmed. Conclusion The outcomes of the research realized will be given to the managements of the above medical facilities, with the aim of increasing the nurses' knowledge of possible risks occurring in the performance of their work, as well as possible ways of eliminating these risks.
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BCRP in the placenta - expression, lokalization, function
Šobáňová, Ivana ; Štaud, František (advisor) ; Nachtigal, Petr (referee)
Breast cancer resistance protein (BCRP, ABCG2, ABCP, MXR) is the 72 kDa multidrug resistance protein belonging to the family of ABC transporters. This efflux transporter is able to distinguish and actively extrude a wide variety of chemically and structurally unrelated compounds out of cells. BCRP is most expresse in the majority of human tissues, most abundantly it is expressed in the apical membrane of placental syncytiotrophoblasts. This localization predetermines BCRP to play an important role in protecting the fetus by limiting the penetration of various xenobiotics across the placental barrier. Because of the need to treat some diseases even during pregnancy the knowledge of transplacental pharmacokinetics becomes necessary for evaluation of potential toxicity and therapeutic value of the drugs in pregnancy. The aim of this work is to summarize the current knowledge concerning the expression, localization, polymorphism and function of BCRP transporter in placenta and also the role of BCRP in pharmacotherapy in pregnancy.
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Technical equipment of fire protection for the decontamination of people and technology.
POJETA, Antonín
This bachelor thesis is describing problems regarding technical equipment of fire-brigade units while decontaminating citizens and technology not in the state of war within the Czech Republic territory. Based on the national conditions this thesis is specializing in the civil area. It stresses out the need of the Czech fire-brigade units to be prepared for decontamination of citizens from dangerous substances in case of emergencies, accidents but also in case of a terrorist attack. This thesis is also taking into account the possibility of setting in the special Czech Army units. Theoretical part of the bachelor thesis is an introduction into the topic, defines historical events connected with the need of decontamination and in general people's comprehension of decontamination of not only themselves but also everything around them and surrounding them. This is obviously closely connected to contamination without which the decontamination would not have been possible. Decontamination chapter contains basic definitions, defining basic procedures including chemical substances used for decontamination with connection to detection and identification of substances, definition of operation and protection area. The description of forces and equipment used for decontamination is in the last chapter of the theoretical part of the thesis. It also mentions the laws of the concerned topic and location of the above mentioned units within the Czech Republic. Research problems and procedure of the thesis has been set up in the second, practical part. Its aim is the compare two different citizen and technology decontamination techniques which are used as a part of equipment of rescue units in the Czech Republic. It is also possible for those two techniques to participate on the same emergency event and based on one-generation distance between those two techniques the main question was perfectly clear from the beginning. Is the new technology used by the Czech fire-brigade units better than the old one, or modernised technology of the Czech Army Forces, considering it as the first solution to special emergency events within all given and defined aspects? Because there are limited technical information available and also not that many units used by the Czech fire-brigade certain types of decontamination lines had to be taken out of the study, such as SDO-A, SDO-1A and SDO-Z, therefor the outcome of this thesis cannot be interpreted unambiguously. Regarding the Czech Army Forces for the research part there was only type of decontamination of citizens used and presented. The rescue teams are currently using two decontamination lines which were compared within the comparison decontamination techniques study. The Integrated Rescue System in the Czech Republic is prepared for mass citizen-and-technology decontamination in both, material and educational, ways based on technical data given in the discussions present in the research part of the thesis. The concerned workers have also mentioned that there are specific trainings missing to crosscheck the whole technology within extreme conditions. We also came across the knowledge of a lot of problematic parts and incomplete systems, this information was given to us directly by the field-workers. The findings based on the research are presented at the end of the thesis as recommendations for practical use and improvement for current situation in case of mass-decontamination in the Czech Republic.
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Determination of structure and dynamics of biomolecules by theoretical calculations of NMR spectroscopic parameters
Benda, Ladislav ; Sychrovský, Vladimír (advisor) ; Munzarová, Markéta (referee) ; Hrabal, Richard (referee)
iv Abstract Subject: Determination of structure and dynamics of biomolecules by theoretical calcu- lations of NMR spectroscopic parameters Author: Ladislav Benda, ladislav.benda@gmail.com Department/Institute: Institute of Organic Chemistry and Biochemistry, AS CR Supervisor: Dr. Vladim'ır Sychrovsk'y, Institute of Organic Chemistry and Biochemistry, AS CR, vladimir.sychrovsky@uochb.cas.cz Abstract: This doctoral work was focused on theoretical modeling of nuclear magnetic resonance (NMR) parameters in peptides and nucleic acids. Dependences of NMR para- meters on molecular structure and solvation were primarily modeled. Great emphasis was put on the comparison of the calculated data with the NMR experiment. The molecular models studied included the l-alanyl-l-alanine di-peptide (AA) and the phosphate group of nucleic acid backbone. Conformations of all three charged forms of AA in solution were determined and the respective pH-induced changes of experimental NMR chemical shifts and nuclear spin-spin coupling constants were explained. Dependences of NMR cross-correlated relaxation rates on the AA backbone geometry were calibrated. The 31 P NMR parameters in nucleic acid phosphate were systematically calculated in dependence on the backbone conformation and the phosphate solvation pattern. Qualitative rules...
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Frustrated Lewis pairs-assisted reduction of carbonyl compounds
Marek, Aleš ; Pedersen, M. H. F.
An alternative and robust method for the reduction of carbonyl groups by frustrated Lewis pairs (FLPs) is reported in this paper. With its very mild reaction conditions, good to excellent yields, absolute regioselectivity and the non-metallic character of the reagent, it provides an excellent tool for 1H, 2H as well as 3H chemistry. It is a new strategy for the one-pot synthesis of aromatic alcohols selectively labeled with heavy isotopes of hydrogen.
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Preparation of Magnesium Silicide from Recycled Materials for Energy Storage.
Bumba, Jakub ; Dytrych, Pavel ; Šolcová, Olga ; Koštejn, Martin ; Fajgar, Radek ; Maléterová, Ywetta ; Kaštánek, František
Recycling technologies help to save energy, materials and environment. This is the main reason of their popularity. The recovery of semiconductors and metals depends on recycling treatment. A new multi-step technology, which enables to obtain pure silicon and hydrogen from waste materials,is reported in this study. The only by-product is magnesium phosphate, which is a desired fertilizer. Magnesium silicide was successfully prepared from milled silicon photovoltaic (PV) panels and milled Mg obtained from the scrap. The formed magnesium silicide was then hydrolysed by phosphoric acid to form a mixture of silanes. Gaseous products (silanes) were separated by cooling below their boiling temperature by liquid nitrogen and then thermally decomposed by a hot wire, e.g. Pt.This treatment leads to pure silicon and hydrogen release. In this study a deep-in characterization by various methods spectroscopy, Scanning Electron Microscopy (SEM) with Energy Dispersive X- Ray spectroscopy (EDX), etc.) of prepared samples was also done to explain the individual influences, e.g. reaction temperature and atmosphere.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22016111814301 - PDF
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Vycítí hmyzožraví ptáci rostliny volající o pomoc?
MRÁZOVÁ, Anna
Two chapters in this thesis try to explain whether insectivorous birds can smell volatile compounds released by plants attacked by herbivorous insect, and use them as a cue to locate prey rich plants. First chapter describes field experiments with chemical induction of volatile compounds similar to those released during real herbivory. Second chapter depicts foraging behaviour of birds towards trees with "true" herbivory caused by live caterpillars in a cage experiment.
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Specific water properties of pit lakes in the Czech Republic
Hrdinka, Tomáš ; Janský, Bohumír (advisor) ; Benešová, Libuše (referee) ; Herber, Vladimír (referee)
Anthropogenic lakes constitute a significant part of the Czech countryside water component which has not been given sufficient attention so far. The presented thesis deals with the assessment of variability of physico-chemical properties of water in 30 selected pit lakes in order to identify specific features associated with quarrying of different mineral raw materials, basin morphometry and trophic level of the lakes affecting the quality of accumulated water. In the second part of the thesis the author deals with the comprehensive limnological study of the Hromnické Lake with extreme water chemism resulting from excavation of pyritic shales and focuses on the phenomenon of meromixis especially. The results are based on the evaluation of physical properties of water in the lake vertical profile (temperature, conductivity, dissolved oxygen, pH, transparency and colour) and chemical analyzes of water samples collected from the surface and bottom of the lakes during the four seasons in 2003-07 (determination of Ca, Mg, Na, K, Nammon., NO3 - , SO4 2- , Cl- and alkalinity), including determination of chlorophyll-a. In the case study of the Hromnické Lake conducted in 2010-11, the analysis of hydrological regime of the lake, determination of PO4 3- , TOC, selected metals (Fe, Mn, Al, Zn, Ni, Cu, Co,...
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