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Changes of microbial growth during use of face masks from different materials
Korvasová, Lucie ; Hoová, Julie (referee) ; Márová, Ivana (advisor)
Due to the current spread of Covid-19 disease, there are many types of respiratory protective equipment on the Czech market. However, due to the conditions that breath creates on the inside of the masks, they can be an ideal place for multiplication of microorganisms such as yeasts, moulds and especially bacteria. Since various protection masks differ in their production materials, bacteria colonization won’t always be the same. The subject of the thesis is a comparison of individual types of masks and respirators with regard to multiplication of microorganisms in their structure, which were tested using the contact stamp-form method on agar plates and in a liquid medium. Sterile environment was required during the work to avoid external contamination. Methods of imprinting on agar plates and the fact that turbidity and thus measurable absorbance increases with rising number of microorganisms were used to obtain the data. Result of the work was that face masks already contained some level of contamination from their production. As the best kind of face masks in terms of multiplication of microorganisms came out cotton, which prevented multiplying in the inoculated sphere. At the same time each growing culture was tested for viability, where it was determined how many viable cells each sample contained in comparison to a fully grown culture.
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Pallynological Analysis of Pollen Collected by Honey Bee (Apis mellifera) in the Prague-West District
Štrachová, Markéta ; Říhová, Dagmar (advisor) ; Hanel, Lubomír (referee)
Title of the Thesis The Palynological Analysis of the Pollen Collected by Honey Bee (Apis mellifera) in the Prague-West Area Abstract This diploma thesis underlines the importance and significance of bee pasture. The first part of the thesis contains the presentation of the honey bee (Apis mellifera). It also describes the structure of the pollen grain, pollen as such, and its use regarding bee nutrition, the factors determining bee harvest of pollen, the means of its collecting and the use of bee pollen and bee bread. Furthermore, there are characteristics of pollen pasture in the time of early spring, spring, summer, late summer and autumn. The second part is dedicated to the palynological analysis of the area of Prague-West, Úhonice. The diploma thesis contains the evaluation of the food offer for the bees from the aforementioned location, and the summary of pollen-yielding plants blooming between 1 April 2017 and 27 June 2017. The sampling of pollen balls, which had taken place within this time span, provided the initial information about the nutrition of bees as well as the data regarding the diversity of plant species in the chosen location. In total, the samples contained 98 kinds of plants, out of which 31 were dominantly present above the limit of 6 percent. The longest lasting source of pollen was...
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Changes of microbial growth during use of face masks from different materials
Korvasová, Lucie ; Hoová, Julie (referee) ; Márová, Ivana (advisor)
Due to the current spread of Covid-19 disease, there are many types of respiratory protective equipment on the Czech market. However, due to the conditions that breath creates on the inside of the masks, they can be an ideal place for multiplication of microorganisms such as yeasts, moulds and especially bacteria. Since various protection masks differ in their production materials, bacteria colonization won’t always be the same. The subject of the thesis is a comparison of individual types of masks and respirators with regard to multiplication of microorganisms in their structure, which were tested using the contact stamp-form method on agar plates and in a liquid medium. Sterile environment was required during the work to avoid external contamination. Methods of imprinting on agar plates and the fact that turbidity and thus measurable absorbance increases with rising number of microorganisms were used to obtain the data. Result of the work was that face masks already contained some level of contamination from their production. As the best kind of face masks in terms of multiplication of microorganisms came out cotton, which prevented multiplying in the inoculated sphere. At the same time each growing culture was tested for viability, where it was determined how many viable cells each sample contained in comparison to a fully grown culture.
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The Economics of Face Masks: application of VSL's controversy and GDP's critique on the case of the Czech face masks sewing initiative and its value estimation
Malá, Markéta ; Schwarz, Jiří (advisor) ; Havránková, Zuzana (referee)
The thesis describes the economic context of the face masks sewing initiative in the Czech Republic (the prompt and extensive help of volunteers with tackling the face masks' shortage during the COVID-19 pandemics) and attempts to estimate its economic value. Even in the most conservative scenario that assumes efficacy of face masks to be only 8 %, the results suggest that the initiative still created lower units of billions CZK in economic value as a result of contributing to the prevention of 6,290 - 18,825 infections, 1,006 - 3,012 hospitalizations and 95 - 284 deaths only within the first month. If we assume 20 % masks efficacy, the initiative's value equals to 1 - 9 % of the Czech monthly GDP .
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Pallynological Analysis of Pollen Collected by Honey Bee (Apis mellifera) in the Prague-West District
Štrachová, Markéta ; Říhová, Dagmar (advisor) ; Hanel, Lubomír (referee)
Title of the Thesis The Palynological Analysis of the Pollen Collected by Honey Bee (Apis mellifera) in the Prague-West Area Abstract This diploma thesis underlines the importance and significance of bee pasture. The first part of the thesis contains the presentation of the honey bee (Apis mellifera). It also describes the structure of the pollen grain, pollen as such, and its use regarding bee nutrition, the factors determining bee harvest of pollen, the means of its collecting and the use of bee pollen and bee bread. Furthermore, there are characteristics of pollen pasture in the time of early spring, spring, summer, late summer and autumn. The second part is dedicated to the palynological analysis of the area of Prague-West, Úhonice. The diploma thesis contains the evaluation of the food offer for the bees from the aforementioned location, and the summary of pollen-yielding plants blooming between 1 April 2017 and 27 June 2017. The sampling of pollen balls, which had taken place within this time span, provided the initial information about the nutrition of bees as well as the data regarding the diversity of plant species in the chosen location. In total, the samples contained 98 kinds of plants, out of which 31 were dominantly present above the limit of 6 percent. The longest lasting source of pollen was...
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