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Nitrate Client Performance Improvement with Cache Implementation
Holec, Filip ; Letko, Zdeněk (referee) ; Müller, Petr (advisor)
The goal of the thesis is to design and implement performance improvements in python-nitrate module. Performance improvements are based on gathered use cases, which use large amount of data and network bandwidth. Performance test suite was implemented in order to measure impact of changes in module. Testing proved, that python-nitrate module with integrated performance improvements is in certain cases several times faster, but also can be slower in two cases. Discussion regarding possible extensions is present in the conclusion.
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Determination of nitrates in vegetables by capillary izotachophoresis
Jančová, Nikola ; Zlámalová Gargošová, Helena (referee) ; Řezáčová, Veronika (advisor)
This bachelor thesis deals with determination of nitrates in vegetables employing the capillary isotachophoresis technique. The literature review is devoted to occurrence of nitrates in vegetables, their health risks, the influence of food processing onto nitrate content, commonly used methods of determination as well as the capillary isotachophoresis and its practical application. Experimental part focuses on the application of capillary isotachophoresis for determination of nitrate content in vegetables obtained from conventional agriculture and organic farming.
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Study of properties DET, a method for pore water for sediment sampling
JAROLÍMOVÁ, Zuzana
The aim of this thesis was find out chosen properties of DET (diffusive equilibration in thin films), method for pore water for sediment sampling. This properties were: 1)the time require for equilibration between: a)distilled water in gel within DET and pore water b)sample of pore water within DET and distilled water 2)the comparison of samples pore water sampling with DET and other method 3)determination of DET properties in practice
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An experimental study of initial succession on different substrata: analysis of changes in plant species cover and some soil biological parameters and their relationships
KRESÁČ, Martin
A four year experimental study of initial stages of succession on different substrata (sand, peat and gray clay overburden from brown coal mining) was carried out. The substrata were transplanted into two different landscape types in the Czech Republic. Control plots were filled with autochthonous topsoil treated with high temperature vapor. Plots with un-treated autochthonous topsoil were also established. Plant species cover and several soil-biological parameters (soil microbial biomass, basal soil respiration, exchangeable pH(KCl), organic-C extractable by potassium sulfate solution, and nitrate-N content) were measured once a year. Obtained data were mainly processed by unimodal (plant cover data) and liner (soil-biological data) ordination methods. Biological species traits (life span, seed dispersal vector, seed bank type, ecological strategy type following Grime, life form following Raunkiaer) were used to characterize early stages of plant succession. Vegetation and measured soil-biological parameters, except pH(KCl), were significantly changing during four growing seasons. Variance partitioning analysis based on plant species cover data indicated the landscape type to be the main governing factor and physico-chemical characteristics of substrate to be less important during the studied initial stages of succession. The same analysis based on soil-biological parameters showed the reverse result. Great variability of plant species ecological traits was noticed during four growing seasons. The earliest plant colonizers were mainly ruderal, anemochorous terophytes with persistent seed bank. The number of species with C-strategy type increased during the study. The relationship between the average plant species cover and measured soil-biological parameters was also examined during the experimental study of early succession. Direct and indirect ordination revealed the average sum of plant species cover to be weakly positively correlated with soil microbial biomass, basal soil respiration, nitrate-N, potassium sulfate extractable organic-C, metabolic quocient (qCO2) and negatively correlated to exchangeable pH(KCl). The relationship was significant only in the case of microbial biomass and potassium sulfate extractable organic-C. More detailed studies of the relationship between aboveground plant species biomass and soil microbial communities in initial stages of succession are required. Comparability of presented study is limited because not many experimental investigations of similar kind have been presented until now.
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