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Yield and quality of hemp oil and its utiliation
SKŘIVÁNKOVÁ, Ilona
Hemp is a versatile plant. Nowadays it is used in almost all sectors of human activity. Cultivation of hemp brings new job positions, revitalizes agriculture and engineering industries as well as other sectors of the economy and allows to re-establish a relationship between man and nature ? thanks to the help of modern technology. The following literature review, whose task was to summarize and evaluate the potential for exploitation, production and subsequent processing of hemp seed oil shows that hemp seed oil is an excellent source for the body of the necessary essential fatty acids in optimal proportions, and is also rich in other important nutrients such as the phytosterols and tocopherols. The methods of obtaining oil from hemp seeds, pressing and extraction, were recorded as differences in the preparation of seeds, and in the direct extraction process. Both methods have their pros and cons. The cold-pressing was found to be low yield and extraction methods is the disadvantage of technology and resources. Production and distribution of cannabis products in the Czech Republic dealing with several companies, two of which are oil notified under Directive 98/34/EC. Growing cannabis seeds will for most businesses in the Republic of the growing issues of risk and economically and will therefore be limited to more southern areas to ensure high seed yields.
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Indirect speciation of mercury in soils and sediments with cold vapor atomic absorption spectrometry.
ŠPAČKOVÁ, Jitka
In the diploma thesis have been tested four extraction techniques for isolation of organic forms of mercury from sediments (liquid liquid extraction, microwave extraction in liquid liquid extraction, solid phase extraction and extraction with use of ionic exchange) followed by determination of mercury by atomic absorption spectrometer AMA?254. It has been achieved great results during liquid liquid extraction likewise ionic exchange extraction. Reached percents of orgHg were in accord with certified reference material for sediments CRM-580 and corresponded to 86,44 ? 16,63 %, resp. 87,01 ? 29,22 %. Thanks to a simple procedure, extraction speed and ease of determination of organic forms of mercury contain was first of all (in the first instance) verified a method with use of ionic exchange, whose principle and procedure is very elementary. This technique was applied to a number of real sediment samples collected from water tanks Jordan and Skalka. It was approved that this method has been presenting a suitable alternative to chromatographic methods or methods of electro?migration.
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System of evaluation of soil organic matter based on fractionation by level of hydrophilic characteristics and by characterisation of fractions with differential thermic analysis
STROSSER, Eduard
The contemporary methods of evaluation of the soil organic matter do not sufficiently characterize its stability. The aim of this study is to develop a method for soil organic matter stability evaluation. The four different methods were tested, two based on chemical principle a two on microbiology principle. The first method is based on sequential soil organic matter fractionation by a system of solvents with increasing polarity, the second method uses oxidizers with different oxidizing efficiency. In the third method micro-organisms decompose soil organic matter in anaerobic environment as well as in the four method, but this one makes use of up gas production measuring sensors. The method of sequential extraction is not suitable for practical use, the oxidation method is preferred. The oxidation method also both microbiology methods imply that the most important part of soil organic matter is decomposed rapidly or while using weak oxidizer. This fraction is the most important for evaluation decomposability and it is characteristic for particular soils. After decomposition of this part of SOM its remnant is decomposed steady and linear or micro-organisms are not able to decompose it.
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Effect of N eutrofication of wetland soils on organic N content and quality
ŠEDA, Martin
This study deals with an effect of fertilization on amount and quality of free amino acids in soil from wet meadows affected by nutrient loading. Free amino acids were analysed in the soil from the field experiment situated at wet meadows, where an increased nutrient input is simulated (fertilizer NPK). The experiment was established on two sites with different types of soil {--} Záblatí with organic soil and Hamr with mineral soil, both areas in the South Bohemia region. The soil was repeatedly sampled for more than two years and year. One part of this study is focused on testing of ninhydrine-method and HPLC-method for measuring free amino acids and efficiency of different extractants.
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Applications of the fingerprint sensing in IT
Rakár, Peter ; Balada, Jakub (advisor) ; Kulovaný, Martin (referee)
The biometrics is a branch with long history. With the arrival of information technologies biometrics also penetrates onto the field of the computer science. Even if there have been specialists concerned with application of biometrics in informatics for decades, state of the biometric technologies does not provide hundred percent reliability. Biometrics in IT is still evolving and with improving technologies from other spheres of the human activity new challenges also arise in biometrics. Biometry of fingerprint is the most common and the most used biometry in practice. The aim of this work is to bring the problem of fingerprints sensing and recognition closer to the reader. Work describes individual characteristics of fingerprints as well as common aspects of all other biometrics. Next concern of the work is the application of fingerprints biometry in practice. It is closer concerned with the most common methods and approaches which are used in implementation of fingerprints sensing, analyzes, recognition and classification in biometric system. The goal of the work is not to create an exact guideline for fingerprints implementation but to make the reader acquainted with possibilities, advantages and weakness of the biometry of fingerprints in context of IT.
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