National Repository of Grey Literature 196 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Ability to Discriminate Floral Morphotypes by Hoverflies
Matoušková, Eva ; Janovský, Zdeněk (advisor) ; Klečka, Jan (referee)
The attractiveness of flowers to pollinators is mediated by several floral traits. The ability to discriminate the flowers based on these floral traits is crucial for the flower reproduction and pollinator nutrition and reproduction. We tested three floral traits - colour, size and shape - along with their combinations using artificially 3D printed flowers on model organism Eristalis tenax in laboratory conditions. Our findings revealed that the most important floral trait was the colour followed by size. Additionally, the effect of colour was enhanced by size, but only for the preferred colour. This suggests that preferences for specific floral traits can be structured. The effect of symmetry was not significant. Subsequently, we observed non-naïve hoverflies and bumblebees in the field on flower patch consisting of devil's-bit scabious (Succisa pratensis). We were interested in the role of other floral traits when the colour and size were indistinguishable. The most important characteristics were height and effective number of florets in the inflorescence. The hoverflies tend to do longer visits than bumblebees and visited more flowers as well. Conversely, bumblebees did shorter but more efficient visits, likely due to their eusociality. Keywords: Syrphidae, Apidae, Eristalis tenax, Bombus spp.,...
The covid 19 outbreak as seen by foreign reporters of Czech radio
Klečka, Jiří ; Lovaš, Karol (advisor) ; Jirků, Jan (referee)
The covid pandemic has affected both mainstream domestic and foreign news coverage. This thesis examines how the spread of the disease affected the work of Czech Radio reporters. How did they have to adapt, what impact did the pandemic have on their personal lives or what were the possibilities of returning from foreign posts to the Czech Republic. The aim of the thesis is also to compare what topics the newsroom in Prague demanded from the reporters and what information was available to them in the country where they were stationed. I also briefly discuss the radio's response to the pandemic and how Radio as a public media outlet took care of its employees abroad. I then discuss the results of the interviews with the correspondents with their then manager. Before analysing the interviews with the correspondents, the thesis introduces them in short medallions and also charts important world and domestic events that were the main focus of the news coverage during the pandemic. The thesis also briefly defines the nature of the work of a foreign correspondent and the impact of the pandemic on the news coverage.
The covid 19 outbreak as seen by foreign reporters of Czech radio
Klečka, Jiří ; Lovaš, Karol (advisor) ; Moravec, Václav (referee)
The covid pandemic has affected both mainstream domestic and foreign news coverage. This thesis examines how the spread of the disease affected the work of Czech Radio reporters. How did they have to adapt, what impact did the pandemic have on their personal lives or what were the possibilities of returning from foreign posts to the Czech Republic. The aim of the thesis is also to compare what topics the newsroom in Prague demanded from the reporters and what information was available to them in the country where they were stationed. I also briefly discuss the radio's response to the pandemic and how radio as a public media outlet took care of its employees abroad. I then discuss the results of the interviews with the correspondents with their former manager. Before analysing the interviews with the correspondents, the thesis introduces them in short medallions and also charts important world and domestic events that were the main focus of the news coverage during the pandemic. The thesis also briefly defines the nature of the work of a foreign correspondent and the impact of the pandemic on the news coverage.
Design of heating system of office building
Klečka, Jaroslav ; Topič, Jan (referee) ; Horká, Lucie (advisor)
The bachelor's thesis deals with the design and solution of the heating system in the Administrative Building in Brno. The work will be divided into three parts. The first part is theoretical, namely by comparing hydrogen fuel and natural gas. The second part will include the calculation and design part, in this part the work deals with the design of boiler room components, calculation of heat losses, etc. The third part means the design documentation of the construction, which will be processed at the level of the DPS (documentation of the execution of the construction).
Ecological and Evolutionary Processes Driving the Structure of Plant-Pollinator Networks
Hadrava, Jiří ; Klečka, Jan (advisor) ; Gilbert, Francis Sylvest (referee) ; Vujić, Ante (referee)
Associations between flowers and pollinators are responsible for reproduction of majority of plant species as well as food supply for substantial part of animal diversity on the Earth. Until recently, the studies on plant-pollinator relationship were focused predominantly on pollination of particular plant species, with only little or no accent on community perspective. In recent decades, however, pollination ecology shifted its focus rather to community context by introducing so called pollination networks. This approach allows us to view the ubiquity and complexity of the interactions between plants and their pollinators and it opened up many new opportunities to study the pollination from animal perspective or to access spatio-temporal variability in the interactions. However, we still have only limited insight into the processes driving the structure and dynamics of such networks. The assembly of plants, pollinators and their interactions are driven by various ecological as well as evolutionary processes. From the ecological point of view, species co-occurrence in time and space may affect the interactions, or species flexibility for various community contexts providing different food sources may play role. In the evolutionary perspective, species may have various co-adaptations due to their...
Food supplements in strength sports
KLEČKA, Jan
In this bachelor's thesis on Dietary Supplements in Strength Sports, I investigated whether elite athletes are able to consume sufficient nutrients without dietary supplements and what types of dietary supplements are used by strength athletes. I chose the respondents from three branches of strength sports, those sports are power triathlon, strongman sport and weightlifting. These are the leading athletes in these sectors in the Czech Republic and they are able to outline to me the topic of taking dietary supplements. The theoretical part is focused on the nutrition of athletes. In each section I have discussed a description of strength sports, including the history of strength sports, then I have discussed macronutrients, micronutrients and also the issue of dietary supplements, where I have described the history of dietary supplements and also their distribution. In the theoretical part I drew from books and professional journals. For the practical part of the thesis I set three objectives. The first objective was to map what types of dietary supplements are used by strength athletes, the second objective was to map what amounts of dietary supplements are used by strength athletes, and the third objective was to determine if a regular and complete diet provides the necessary amount of energy and individual nutrients. Ten athletes participated in my research, 9 men and 1 woman. I obtained data from them through a semi-structured interview and from their dietary records. The results show that the respondents are taking 10 types of supplements and 6 out of 10 respondents are able to take sufficient energy from their regular diet. The dietary analysis shows that respondents prefer a diet higher in fat and protein at the expense of carbohydrates, where a higher proportion of fat in the diet reduces the amount of food needed to meet the respondents' energy needs. It can also be observed that respondents do not place much emphasis on fibre intake.
The efficiency of pollen transfer by selected functional groups of pollinators and the ability of plants to influence it
Freudenfeld, Martin ; Janovský, Zdeněk (advisor) ; Klečka, Jan (referee)
Pollinator functional groups differ in their pollen carryover effectiveness and in the importance for particular species of plants, due to specific functional traits of pollinator functional groups. Plant species differ in their specific functional traits too. I determined pollen loads of pollinators by swabbing their bodies with a jelly to compare pollen carryover effectiveness of pollinator functional groups. This helped me to decide which pollinator functional groups are the most and the least effective in pollen carryover. I considered an influence of the last visited flower to make the comparison of pollen loads more accurate. I also calculated proportions of conspecific and heterospecific pollen grains carried on bodies of pollinators to estimate their carryover effectiveness. Likewise, I compared composition of pollen morphotypes carried on pollinator's bodies to find out differences among pollinator functional groups. My analysis shows that pollen carryover effectiveness of particular pollinator functional groups differ. Apis mellifera and solitary bees have the biggest pollen loads, on the other hand, butterfies and small dipterans have the smallest pollen loads. The last visited flower influences an amount of pollen grains carried on bodies of pollinators. Relative pollen loads of some...
Microstructure and microhardness evaluation for NiCrAlY materials manufactured by spark plasma sintering and plasma spraying
Hulka, Iosif ; Mušálek, Radek ; Lukáč, František ; Klečka, Jakub ; Chráska, Tomáš
NiCrAlY deposited by different thermal spraying methods is commonly used as the bond coat material in thermal barrier coatings (TBCs). In the present study, two experimental coatings were deposited by hybrid water stabilized plasma (WSP-H) and radio frequency inductively coupled plasma (RF-ICP) using the same feedstock powder. Spark plasma sintering (SPS) was used to manufacture a compact NiCrAlY from the same feedstock powder as a reference material. Microstructure, internal oxidation, phase characterization and quantification of the mechanical behaviour in terms of microhardness were studied. The investigations clearly showed microstructural and mechanical differences between the NiCrAlY samples manufactured by different plasma technologies. The results confirmed that SPS and RF-ICP provide dense structures with no oxides due to the fabrication under protective atmosphere and similar mechanical properties. Thus, RF-ICP may be used for deposition of very dense coatings with microstructure and hardness comparable to compacted materials prepared by SPS.
Organization of public administration in the Capital City of Prague
Klečka, Jan ; Vedral, Josef (advisor) ; Svoboda, Petr (referee)
of the thesis "Organisation of public administration in the City of Prague" This thesis focuses on complex issue of organisation of public administration in the City of Prague. The reason, which led author to choose this topic, is that there are only few jurists, who dedicate more that several words to this subject in their studies or articles. Therefore this subject matter isn't as explored as for example organisation of public administration in villages or counties in Czech Republic. Aim of this thesis is to go through several sources of information from legislation, judgements and jurisprudence and provide a complex view on current legislation, which regulates organisation of public administration in the City of Prague. Author also tries to add his opinions on some sources. At first we find some theoretical introduction to the topic and brief summary of historical development of the Prague. These facts are used in following chapters. Main part of the thesis is in Chapter Five and Chapter Six. Chapter Five includes description of legislation, which concerned this issue since 1850. This year was not selected casually. It's year of inception of self-government in the Prague. Chapter Six describes activities of administrative bodies, which operate in the City of Prague and its boroughs. Author...
USE OF TUMOR MARKERS IN POSTOPERATIVE PROGNOSIS OF NON-SMALL-CELL LUNG CANCER
Šafránek, Jarmil ; Klečka, Jiří (advisor) ; Schützner, Jan (referee) ; Haruštiak, Svetozár (referee) ; Čapov, Ivan (referee)
USE OF TUMOR MARKERS IN POSTOPERATIVE PROGNOSIS OF NON-SMALL- CELL LUNG CANCER Introduction: The most frequently used prognostic parameters in clinical practice of NSCLC are disease stadium and affection of hilar or mediastinal lymph nodes. These phactors are not sufficient and therefore new prognostic parameters - tumor markers - are being searched for. Tumor markers regarding NSCLC have mainly been used so far to monitore effects of medical treatment or detection of carcinoma recurrency. The study concentrates on assessment of tumor markers significance for NSCLC. Methods: The total group includes 125 patients operated on for NSCLC in the years 2004-2007. Single groups of patients were assessed successively. Serum markers CYFRA 21-1, CEA, TK, TPS, and NSE were assessed in an immunoanalytical way in 34 patients: Serum parameters of angiogenesis through Luminex® xMAP® technology were assessed in 27 patients. Serum values of cytokeratins were assessed in an immunoanalytical way with 125 patients. Expressions of metalloproteinases (MMP-7, MMP-9) and their inhibitors (TIMP-1, TIMP-2) were assessed in NSCLC tissue with 91 patients and in lung tissue with 12 patients with benign pulmonary disease. Finally, OS and DFI were assessed in accordance with tissue expression of metalloproteinases and their...

National Repository of Grey Literature : 196 records found   1 - 10nextend  jump to record:
See also: similar author names
17 KLEČKA, Jan
3 Klečka, Jakub
17 Klečka, Jan
3 Klečka, Jaroslav
6 Klečka, Jiří
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