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Molecular dynamics study of admixture influence on structural properties and stability of fatty acid Langmuir monolayers
Kubániová, Denisa ; Roeselová, Martina (advisor) ; Barvík, Ivan (referee)
Using the classical molecular dynamics simulations, the interfacial partitioning of selected aromatic species, namely benzoic acid and neutral and zwitterionic form of L-phenylalanine, was studied in the three slab systems: a) aqueous organics solution, b) palmitic acid monolayer in tilted condensed phase at aqueous organics solution and c) palmitic acid monolayer in tilted condensed - 2D gas phase coexistence at aqueous organics solution. The surface activity and the tendency to aggregate in particular at the air- aqueous and palmitic acid-aqueous interface was confirmed for all of the investigated aromatic species. The results of the simulation performed for the system of palmitic acid monolayer at benzoic acid solution were compared with the literature results of a similar simulation that employed a different parametrization. The comparison showed that the behaviour of the aromatic species at the fatty acid monolayer-aqueous interface strongly depends on the force field. The structural properties of the palmitic acid Langmuir monolayers were evaluated by means of the chain tilt angle and the headgroup region dihedral angle distributions analysis depending on the surface film density and the adsorbed aromatic species. The simulations mimicking the isothermal compression of the mixed monolayer in the...
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Adsorption of AOM amino acids onto activated carbon
Čermáková, Lenka ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee)
This diploma thesis deals with the efficiency and factors affecting the adsorption of AOM (Algal Organic Matter) amino acids (AAs) arginine (Arg), phenylalanine (Phe) and aspartic acid (Asp) onto granular activated carbon (GAC) Picabiol 12x40 (PIC). The efficiency of AOM AAs removal was studied in laboratory equilibrium and kinetic experiments and it was shown that the adsorption efficiency of the selected AAs is dependent on the structure of the molecule of AAs and the nature of the functional groups of their side chain, and more particularly to solution pH, which determines the nature and size and surface charge of AAs and GAC. In contrast to this, the ionic strength (IS) of solution had relatively low effect on the AAs adsorption. Arg adsorption efficiency increased with increasing pH and reached a maximum at pH 9, where AAs and GAC were oppositely charged, and this leads to attractive electrostatic interactions. In the case of Asp adsorption on PIC practically did not work. The reason is that under all experimental conditions Asp molecules and the surface of the PIC carried identical negative charge. This led to the strong electrostatic repulsion between Asp and PIC which prevented effective adsorption. In the case of Phe the adsorption decreases with increasing pH. Maximum adsorption...
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Psychical problems of people suffering from phenylketonuria
NENADÁLOVÁ, Lucie
The bachelor thesis called "The psychical problems of people suffering from phenylketonuria" attempts to introduce the life of the people who were born with phenylketonuria diagnosis. The theoretical part of this thesis implies the explanation of the term phenylketonuria, diagnostics of this disease including treatment options. Furthermore, the theoretical part deals with psychical problems associated with phenylketonuria and its impact on education and family field. In the practical part there are examined the case studies of people who suffers from this metabolic defect. The thesis observes the quality of their lives, mentions eventual mental problems they have to cope with and describes their strategies of dealing with phenylketonuria. The aim of this thesis is to examine the impact of phenylketonuria on the psyche of the individuals and the strategies of coping with this metabolic defect.
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Phenylketonuria and the Life with the Disease.
JÁNSKÁ, Karin
Phenylketonuria is an autosomal hereditary metabolic disorder of amino acids caused by insufficient activity of liver enzyme phenylalanine hydroxylase, which is necessary for metabolism of the essential amino acid phenylalanine to tyrosine. Obligatory newborn screening aimed at detection of the disease before development of clinical symptoms was introduced in Czechoslovakia in 1975. Increased level of phenylalanine in blood leads to an irreversible damage of the nerve system, mental retardation. Phenylketonuria is an incurable, however treatable disease, where diet with low phenylalanine content is still the only treatment. As amino acids are the building units of proteins, patients have to take proteins in the form of amino-acid products without phenylalanine. Although high phenylalanine levels lead to irreversible damages it cannot be completely eliminated from nourishment as it is necessary for the growth and development of a human. Phenylketonuria prevalence is 1:5338 in the Czech Republic as of 2013. Patients with this disease have to be dispensarized for the whole life. Women that want to become pregnant should be much more careful in adherence to the diet as sudden increase of phenylalanine in mother's blood threatens healthy development of the foetus. The thesis named Phenylketonuria and the Life with the Disease is elaborated on theoretical base by scientific methods of explanation, modelling and induction. The aim of elaboration of this topic was to map the problems related to phenylketonuria, including nursing care and the life obstacles to patients with the diagnosis. Medicine journals, e.g. Československá pediatrie, Metabolík, Výživa a potraviny, Medicína a umění, where the latest findings based on recent studies are published, were another important source of information. After studying literature specialized in the topic our task was to provide important information. The present thesis is divided into four chapters. The first chapter provides basic information on phenylketonuria. We learn how the diagnosis is classified, what its nature is, the occurrence of phenylketonuria in individual countries is described here. It outlines the history, diagnostics and developing symptoms of untreated phenylketonuria. Lifelong diet with low phenylalanine content is the basic treatment, other treatment methods are still in the research phase. The second chapter focuses on the nursing care of a patient with phenylketonuria, it outlines the role of a nurse in the care of hospitalized patients. The problems of anaesthesia are also marginally mentioned here. We can find a list of metabolomic workplaces specialized in the care of these patients in the Czech Republic. Deficits linked to adherence to low protein diet are also mentioned. The third chapter deals with diet for patients with phenylketonuria at various life stages. The last chapter describes the economic-ethical problem and current contributions of health insurers to diet products. The assigned bachelor thesis might serve as informational material in practice, as it is suitable for all those interested in the issue. If the assigned bachelor thesis outlined the nature of phenylketonuria and an individual founds answers to his/her questions there, the thesis would meet its purpose. More than eighty years have passed since the explanation of the phenylketonuria nature. Diagnostics methods have developed from the napkin test with ferric chloride to newborn screening where a blood drop is taken from new-born baby's heal on a filter paper and the phenylalanine level is consequently evaluated in a laboratory. The treatment principle however remains the same, namely consistent adherence on low protein diet to reach the optimum phenylalanine concentration in patient's blood.
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