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The influence of value system on the leisure time activities of high school students
DUFKOVÁ, Petra
Just as the inner values influence people´s leisure time, so does the leisure time have effect on people´s value system. The aim of this bachelor´s thesis was an effort to find the relation between the value orientation of today´s high school students and their leisure time. The thesis consists of two parts. In the theoretical part the basic areas of interest, i.e. leisure time and values, have been characterised by means of definition, function and other influences. Further, the youth and period of adolescence have been specified. The practical part is devoted to the high school students´ value system. The figures have been gained via questionnaire investigation held among students of high schools, secondary schools and vocational schools. The content and amount of their leisure time have been monitored and compared.
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Hodnocení jakosti a autentičnosti ovocných šťáv
Dufková, Petra
The literary part of the bachelor´s thesis comprises of material composition, the technology of production and forging of fruit juices. The research in this thesis is dealing with the analysis of 3 different kinds of fruit juice (apple, orange and grapefruit) purchased in a retail network. There have been evaluated 19 samples in total, in which density, soluble dry basis, titratable acids, malic acid, citric acid and ascorbic acid were determined. As samples were used fruit juices purchased in a retail network which were produced by pressing or from a concentrate or from fresh fruit. Obtained results were compiled to a table, compared with allowed values from the AIJN codex and evaluated.
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Sex chromosomes in the house mouse hybrid zone
DUFKOVÁ, Petra
Understanding the genetic basis of reproductive isolation is the ultimate goal of the study of speciation. Here I present the results of a study of gene flow and its barriers at sex chromosome markers across the central European portion of the hybrid zone between two house mouse subspecies, Mus musculus musculus and M. m. domesticus. We identified strong introgression of Y musculus chromosome into the domesticus area accompanied by a perturbation of the census sex ratio. In addition, we detected stochastic effects that can distort results of hybrid zone studies. Finally, we confirmed a strong effect of sex chromosomes on reproductive isolation and hence their important role in the process of speciation.
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