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Determination of nutritional values and antioxidant capacity of different edible roots
Ciffrová, Karolína ; Bendová, Agáta (referee) ; Němcová, Andrea (advisor)
This bachelor thesis deals with selected edible roots, their nutritional composition, antioxidant capacity and use in healthy eating. Eight selected edible roots were analyzed: type A, B and C potatoes, red potatoes, sweet potatoes, and purple potatoes were selected as representatives of potatoes. Jerusalem artichoke and cassava represent the other two root crops. The theoretical section of the thesis describes the basic characteristics of root crops, as well as the description and composition of the nutritional substances they contain, i.e. proteins, carbohydrates, fats, vitamins and antioxidant properties. The general characteristics of the methods used for analysis are also described here. The experimental part is based on specific analyses, procedures, results, chemicals and laboratory equipment used to determine the basic nutritional values and antioxidant capacity of these selected root vegetables. First, the total dry matter content was established to be about 23 % in the selected root crops. Higher dry matter content was determined for the cassava at 35 %. Crude protein content determined by the Kjeldahl method ranges from 6.5-9.9 %. The gravimetrically determined fiber in the given root crops was in the range of 0.27–0.91 %. The starch content is significantly higher in the cassava (46 %) than in other root crops. The inulin content was determined in sweet potatoes and Jerusalem artichokes instead of starch content; this value is significant for the Jerusalem artichoke (258.58 g/kg). Fat content in grams per 100 grams of dry matter was determined by Soxhlet extraction. Significant fat content was determined for sweet potatoes (12.6 g/100 g). From the extracted fats, the fatty acid profile was determined for individual root vegetables, such as the content of saturated (SFA), monounsaturated (MUFA) and polyunsaturated fatty acids (PUFA). Total and reducing carbohydrates, determined by the spectrophotometric method, were measured separately in the peel and pulp of the root crops. Antioxidant capacity was determined using antioxidant activity values, polyphenol and flavonoid concentrations. Of the vitamins, vitamin C was determined, vitamin E only in type B, C and purple potatoes. For sweet potatoes, beta-carotene was determined to be 540.56 g/g. The measured and calculated results are plotted in graphs. Finally, there is a discussion of the conclusions of the individual methods.
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Polarization in optical fiber
Bilek, Maroš ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
In the theoretical part of the the bachelor's thesis, the first part is devoted to the analysis of the spread of the light beam in the fiber, the parameters of light and various types of fibers. Subsequently, the phenomenon of polarization, its conditions, methods of depiction and writing are described in detail. Furthermore, the issue of polarization mode dispersion (PMD) is explained. Bindings, differential group delay and PMD measurement methods are described. The practical section of the thesis describes the methods and procedures for measuring polarization and polarization mode dispersion. The EXFO FTB-200 measuring platform was used to measure PMD and was equipped with a module for PMD/CD measurement. A polarimeter in combination with a polarization analyzer was used to measure polarization. As part of the long-term measurements, the EXFO FTB-200 measuring instrument was reused in the case of PMD. In the case of polarization measurements, a combination of polarimeter and balance detector was used. Finally, the results of both short- and long-term measurements are displayed. The results of short-term polarization measurements are shown in the form of both, a Poincaré sphere and a polarizing ellipse with a calculated azimuth and ellipticity. Long-term measurements are in the form of graphs that show changes in polarization rotation rate over time. From the displayed results, the dependency of polarization and therefore PMD on the environmental surroundings is concluded.
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Verification Of Transmission Parameters Of Multicore Optical Fiber
Látal, Michal
With the ever-increasing demands on the transmission parameters of telecommunicationoptical systems, such as transmission capacity, new challenges arise for scientists to meet these requirements.One of the possible solutions to increase the transmission capacity of telecommunicationnetworks is the multicore optical fiber, which is the current trend in modern space division multiplex.First and second chapters of the article deal with the modern concept of space division multiplex.A selected seven-core optical fiber was tested for insertion loss, attenuation, length for individualcores, and fiber continuity using the direct and backscattering method. The achieved results of theperformed measurements are summarized and commented in the third chapter of the article.
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Quantum key distribution test polygon
Širjov, Jakub ; Horváth, Tomáš (referee) ; Látal, Michal (advisor)
The aim of this masters thesis is to explain quantum key distribution (QKD) and principle of signal transmission in the quantum channel. Further this thesis complains commercial distributors of QKD technologies and their individual appliances. Practical part of the thesis is separated to 3 parts. First part handles transmission of quantum keys in QKDNetsim simulator. Second part takes care of design and creation of a test polygon that allows for testing of many optical network configurations with quantum signal and normal data traffic being transmitted in a single fiber. Multiple simulations of use of various filter types to supress the signal noise in the program VPIphotonics and tested by QKDNetsim are shown in the last part of this thesis.
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Changes In Toddlers' Intestinal Microflora After Antibiotics In Connection To Nutrition
MRLÍKOVÁ, Tereza
The bachelor thesis focuses on changes in toddlers' intestinal microflora after antibiotics in connection to nutrition. The first aim is to inform public about the importance of healthy gut microbiota. The second aim is to determine to what extent antibiotics influence intestinal microflora. The third aim is to analyze a list of daily meals of selected toddlers with antibiotics and to propose recommendations to support the health of intestinal microflora. In the theoretical part of my bachelor thesis I focus on key information about intestinal microflora, its characteristics, abilities and benefits for human organism. I also mention effects of enviroment on microbiota, benefits of fiber as an important source of energy for bacteria and ongoing trend of antibiotics indications which have major impact on bacteria. According to my stated goals, in the practical part of my bachelor thesis I analyze stool samples from toddlers before and during antibiotic treatment, compare them and determine if the microbes changed. I simultaneously collected some lists of daily meals from toddlers' mothers and I analyze approprietness of the meals for toddlers and changes that should go along with the antibiotic therapy. I also focus on the presence of probiotic foods. This bachelor thesis can serve as an information background about antibiotic treatment. From laboratory examination we can see that the amount of aerobic bacteria in intestinal microflora changed in 15 toddlers. Altogether only 10 toddlers consumed some probiotic food at least once a day. The sufficient amount of fiber according to my estimation fulfilled 13 lists. There were 20 toddlers in total.
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stravitelnosti vlákniny kukuřičné siláže
FOUS, Dominik
This thesis is focused on the fiber digestibility of maize silage. The thesis describes the morphology of corn, the chemical composition of the grain and some cultivated maize species. The corn silage, technology and preservation of corn silage are included. Metods In-situ, in-vitro and feed assessment systems according to NRC, INRA and MILK are also described. Feed assessment systems describe how to proceed with the evaluation of individual substances in the feed. Next part of the thesis is focused on fiber and its evaluation. In the end of the thesis are recommendations for practice.
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Studying the properties of fiber cement composites
Cederová, Kristýna ; Hoško, Marek (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis deals with fiber-cement composites. Input materials are investigated for the production of fiber cement, are examined, the production and parameters of the pulp were monitored. Further, Hatschek's production technology and requirements for corrugated fiber-cement roofing are described. In the practical part the individual input materials and parameters of ground pulp were verified. The problem with production of samples and difference in the fineness of pulp milling in fiber cement products has been solved.
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Verification of parameters of passive optical components on short wavelengths
Látal, Michal ; Filka, Miloslav (referee) ; Vojtěch, Josef (advisor)
Semestral thesis deals with the basic theoretical knowledge in the field of optics, light propagation and optical fibers. It describes in detail the optical transmission system and its associated issues, such as the attenuation of optical fibers or differently caused dispersion. The main part of this work is a description of each passive optical elements, their production technologies and applications in optical communications. Within the optical connection its radiation sources and detectors of optical radiation are explained. The last practical part is focused on the measurement of insertion loss provided by passive optical components.
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Proceedings of multidisciplinary conference LASER56
Růžička, Bohdan
Conference LASER56 is a multidisciplinary and intersectoral event where different kind of specialist can meet each other. They come from various environments (private company, university, public research organization etc.). Their common denominators are laser, optics and its applications.\n\n
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