|
|
Effect of environmental factors on the rate of cellulose decomposition in selected wetlands
FILIPOVÁ, Marie
This thesis is a part of the project No. P504/11/1151 of The Grant Agency of the Czech Republic, entitled The role of plants in the greenhouse gas budget of a sedge fen. In this thesis, the decomposition rate of a standard material (cellulose) is assessed for three types of wetlands, which differ in water regime. The study took place at two localitites of marginal wetlands with standing water (Mokré louky near Třeboň, Záblatské louky), two floodplain localities (Brouskův mlýn and Hamerské louky) and two peatbog localities (intact and mined parts of Červené blato, respectively). The intensity of decomposition processes was compared among the sites using the method of cellulose bags. The bags were made from nylon nets, each was divided into five pockets and a cellulose strip was inserted in each pocket. A filter paper was used as the cellulose. These bags were placed vertically into the soil profile so that the upper sample was lying on the surface and the lowest was at the depth of 25 cm below the surface. At each locality four places were randomly selected and four replicate bags with cellulose were placed on each of them. In total 96 bags were put in place, which makes 480 cellulose samples. Two experiments, differing in length of exposition, were carried out in 2013. The samples were taken from the field sites after three and five weeks of exposure (experiment No. 1 and 2, respectively). In both experiments, the decrease in ash-free dry matter was the highest at Hamerské louky. The lowest decrease in ash-free dry matter was in the mined part of Červené blato peatbog. In the second experiment the decrease of the ashless dry matter was more noticable, which was caused by the prolonged exposure. The lowest decrease of ash-free dry matter was found in depths of 0 - 10 cm below the soil surface at all the sites.
|
|
| |
|
|
Substitution of cellulose and non-edible collagen casings by plastic casings in the meat industry in the Czech Republic
BURIAN, Rudolf
The aim of this thesis is to assess the possibility of substitution of cellulose and non-edible collagen casings by plastic casings. The first part deals with selected types of casings, as well as their basic definitions, technological properties and applications, as described in literature. The second part describes the process of carrying out the analysis itself, from the selection of appropriate types of casings produced by Viscofan CZ Ltd. České Budějovice, through the measurement of their chosen technological properties, to the data evaluation
|
|
|
Kinetics and temperature dependance of cellulose degrading enzymes in the Arctic soils
VAZAČ, Jan
Kinetics and temperature dependance of ?-glucosidase and cellobiosidase was investigated in Arctic soil. These enzymes are key in cellulose degradation, while ?-glucosidase produces the final product of cellulose degradation, the glucose, which si readily available to soil microbes and can influence the CO2 production. The enzymes activities was measured using fluorogenic substrates.
|
|
|
Cellulose decomposition in selected wetlands
FILIPOVÁ, Marie
This work deals with the decomposition of cellulose in wetland. The speed decomposition has been studied in several areas. Mokré Louky u Třeboně, Záblatské louky, Červené blato mined and not mined. The intensity of degradation processes were determined using the litter-bags. The experiment was done for two years and each year was used another method. Bags with cellulose were placed in the soil and the soil surface. In this work the values were determined in different places and at different times.
|
|
|
Hydrolysis of corn silage
MÍKA, Václav
Aim work is compare yield GE at acid, alkalic and enzymatic hydrolysis cellulose phytomass at different acidity (H2SO4, 3, 6, 9 and 12%), fundamentals (NaOH, 3, 6, 9 and 12%) and while using different enzymatic preparations (6 preparations to hydrolysis celluloses and hemicelluloses). Further is assessed positive influence compressive extrusion (0,3MPa and 1MPa).
|
|
|
Deriváty oxidované celulozy
Taubner, T. ; Sobek, Jiří ; Havelka, P. ; Kvasnička, F. ; Synytsya, A. ; Čopíková, J.
The reactivity of Na and salt of oxidized cellulose and its oligosaccharides with chitosan will be presented. Hydrolysis of Na and salts of oxidized cellulose was carried out in homogenous system by means with microwave irradiation at constant conditions. The reaction progress was monitored by capillary isotachophoresis and size exclusion chromatography. Reactivity of oxidized cellulose or its hydrolysates with NH2 groups of chitosan was promoted by MW irradiation. Reaction was monitored by infrared spectroscopy.
|
|
| |
|
| |
|
| |
guest ::
