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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Obsah jódu ve vaječném žloutku
 HELLEBRANTOVÁ, Adéla
The aim of the diploma thesis was to evaluate the impact of selected biological and nutritional factors on iodine content in egg yolk. Iodine was determined by the Sandell - Kolthoff spectrophonometric method, in a total of 146 hen eggs and 40 quail eggs. The eggs laid by hens being fed a compound feed contained almost twice as much iodine than eggs laid by hens being fed kitchen food scraps. The iodine values were almost ten times higher in eggs (IQeggs) from retail chain which have been enriched with iodine by the supplier. In addition to the daily iodine intake in feed, the iodine content was also affected by the age of the hens and the period of laying where the eggs of older hens with longer laying period contained more iodine in the yolk. The lowest iodine values were found in the eggs of the Maranska breed from a small - scale farming, covering only 1,2 % of the daily iodine need and the highest values were found in the eggs of the Czech Gold Brindled Hen breed from a special-purpose agricultural university facility, covering 6,2 % of the daily iodine need. Quail yolks contained significantly higher values of iodine, despite a similar iodine daily intake in the food.
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Ecological consequences of habitat loss in landscape matrix and the effect on populations and communities of model species
 HELLEBRANTOVÁ, Adéla
The effect of fragmentation on populations was studied using epigeic beetle collected by pitfall traps with ethylenglykol. Pitfall traps were placed at three sites and namely in: artifical spruce forest, bio-corridor and meadow in the vicinity of České Budějovice on agricultural landscape. The material was collected from May to September. Beetles were determined and classified into goups according to the level of tolerance to anthropogenic influence. The communities (species richness and its activity) were compared in cited biotopes (fragments) in the agricutlural landscape. The highest number of species and its activity was detected in the bio-corridor. The lowest number of species and its activity was found in the spruce forrest. Thel effect of size of biotope was not found. At a meadow and biocorridor previled beetle species named as eurytopic which are characteristic for deforested habitats strongly influenced by human activities. In the forest, the other half consisted of RII. Group, which are adaptable inhabiting habitat moderately affected by human activity.
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