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Vliv teploty vody a intenzity světla na raný vývoj sumečka afrického v komerčním chovu
PROKEŠOVÁ, Markéta
The successful production of quality early fish stages is crucial for artificial rearing fish species. Nevertheless, it is quite a problematic process, because fish as poikilothermic organisms are highly sensitive to various environmental conditions. Moreover, both fish embryos and larvae are more affected by biotic and abiotic factors (such as predation, stocking density, temperature, light, pH, salinity, oxygen saturation, feeding availability, or their interactions) than older juveniles or adults. Most fish processes such as reproduction, metabolism, survival, development and growth can be considerably (positively, negatively or not) influenced by these conditions. Therefore, it is important to understand their impacts on fish stages during embryonic, larval, juvenile, adult, and eventually the senescent period. Then, following the application of new knowledge to the practise, especially species- and age-specific optimal conditions, should result in higher survival, better growth rate, well developed fish without deformities and lower cannibalism. The objectives of the present thesis were to assess the effect of water temperature and light intensity on the early development (embryonic and larval period) of African sharptooth catfish as a perspective fish species for freshwater intensive aquaculture. Due to its great characteristics (for instance fast growth, ability to breathe atmospheric air, rearing at high stocking density) this species can meaningfully contribute to the global aquaculture production which is expected to rise in the coming years. However, there are still some difficulties in the early rearing African sharptooth catfish regarding the cannibalism, feeding, survival and necessity of detailed information about the effects of some abiotic factors and their interactions.
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Iniciace pohybu byčíku, signalizace a regulace pohyblivosti spermií ryb: fyzikální a biochemické řízení
PROKOPCHUK, Galina
The current study attempted to shed light on the regulatory processes and response arrangements of fish spermatozoa during the course of maturation and motility initiation. The first intent of this study was to improve the understanding of the mechanism underlying the acquisition of potential for sperm motility in sturgeon. Up to present work, the physiological process underlying sperm maturation in this species has not been described at all. Our results showed that sperm maturation in sturgeon occurs outside the testes because of dilution of sperm by urine and involves the participation of high molecular weight substances as well as calcium ions present in seminal fluid and/or urine. The second aim of the present study was to investigate the coping mechanisms in fish spermatozoa with osmotic and ionic activating mode, as well as in spermatozoa of euryhaline fishes, to various environmental conditions. We showed that alteration of environmental osmolality might affect the fish sperm in different ways, depending on fish species and modes of spermatozoa motility activation either osmotic or ionic mode. In response to osmotic stress caused by hypotonicity, carp spermatozoa regulated the flow of water across their cell membrane and increased their cytoplasmic volume during their short motility period. In contrast, no indications of sperm volume changes were observed neither in sterlet nor in brook trout spermatozoa, both of which having an ionic mode of motility activation. We also examined the mechanism by which sperm motility triggering in euryhaline fishes can adapt to a broad range of environmental salinity. Our results demonstrated that spermatozoa of euryhaline tilapia, Sarotherodon melanotheron heudelotii, reared in fresh-, sea- or hypersaline water can be activated in hypotonic, isotonic or hypertonic conditions of swimming milieu, provided Ca2+ ions are present at various levels. It was established that the higher the fish rearing salinity or the more hypertonic ambient media at spermatozoa activation, the higher extracellular concentration of Ca2+ ions is required. The results obtained in the present study allow suggesting that osmolality is not the main factor inhibiting sperm motility inside the testis in the S. melanotheron heudelotii. A third aim of this study was investigation of the regulation of motility initiation process and description of flagellar beating initiation in chondrostean spermatozoa. We detected that K+ inhibition of sperm motility in sturgeon can be by-passed due to the pre-exposure of sperm cells to a high osmolality shock prior to its transfer to K+-rich swimming media. Thus, we hypothesized that sturgeon spermatozoa may be activated by use of an unexpected signaling pathway, independent from regular ionic stimulation. The successive activation steps in sturgeon spermatozoa were investigated by high-speed video microscopy, using specific experimental situation, where sperm motility initiation was delayed in time up to several seconds. At motility initiation, the first couple of bends formed at the basal region begins to propagate towards the flagellar tip, but gradually fades when reaching the mid-flagellum. This behavior repeats several times until a stage where the amplitudes of bends gradually reach similar value, what eventually leads to sperm progressive displacement. The total period needed for the flagellum to switch from immobility with rigid shape to full activity with regular propagating bends ranges from 0.4 to 1.2 seconds. In conclusion, the results of the current study bring valuable pieces of information into the general understanding of the processes of maturation of fish spermatozoa, their adaptability to different physical and biochemical circumstances, the extra- and intra-cellular signaling as well as the regulatory mechanisms of motility activation in fish spermatozoa.
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Analysis of inventory and options to optimize the inventory in the company TE Connectivity
Kocourková, Blanka ; Pánková, Ludmila (advisor)
The diploma thesis deals with the possibilities of optimization of inventory in the company TE Connectivity. The main goal is to analyze the current inventory management and find the optimal way of supply and storage, to minimize capital connected with the inventory. The first part describes the theory of inventory from purchasing, storage to own consuption and distribution, which explains the most important terms. The practical part is focused on the selected company for which the work is about. During the subsequent introduction of the company is explored existing supply system of the company. Using ABC analysis inventory is divided into more and less important. It is necessary to continue working with groups A, B, C: recommended minimum order quantity, calculate the amount of safety stocks with considering to the continuity of the production process. The last section contains a summary and recommended methods including the financial benefits of the recommended changes.
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Post-project analysis of highway connection in Tábor - Soběslav corridor
Váňová, Lucie ; Martiš, Miroslav (advisor) ; Karel, Karel (referee)
Post-project analysis is a key instrument which verifies predictive ability of EIA process. It plays probably the most important role in the improvement of efficiency and usefulness of this process. The main objective of this thesis is the own analysis of the D3 highway connection Tábor - Soběslav and underline the importance of a prost-project monitoring in the sense of terrestrial construction.
Thesis is focused on the evaluation of the whole EIA process and verifies if and how the EIA conditions are fulfilled. The monitoring of water quality and appraisal of the present traffic situation in the examined area shows us the present state compared with the predictive ability of EIA process. In spite of a weak cooperation of involved subjects was confirmed how insignificant and small role plays the prost-project analysis in Czech Republic yet.
With setting up the secondary targets was achieved complex understanding and implementation of the post-project analysis.Results of this thesis could be used as methodical instrucitons for another post-project analysis with similar focus.
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Domestication of the horse and its spread cultural world
Zídková, Kristýna ; Neumann, Cyril (advisor) ; Hana, Hana (referee)
The horse was given to the people with the help of a long and complex process called domestication. He played in our history a very important role. Thanks to him, the human population is widespread almost all over the world. First, the horse was a source of food and later began to use the horse's ability to carry heavy loads or carry riders across the landscape. These animals were participants of all world wars, even the largest ones. Thanks riding became effective military. Evidence of this process can be found in caves, on ceramic products, paintings, but also in books. Today horses as working animals largely replaced the machine, but also horses remain in the care of a man for his leisure. This work deals with the domestication of the horse from its inception, practically up to the present.
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Environmental Impact Assessment Follow up analysis of Pankrác administrative centre
Franclová, Alena ; Keken, Zdeněk (advisor) ; Karel, Karel (referee)
This diploma thesis evaluates issues of environmental impact assessment, focusing on post-project analysis of the Pankrác administrative center. Follow-up evaluation is one of the most important practice through EIA which can fulfil one's potential. Major contribution is mainly the EIA feedback which will be compared between real and predicted impact. Follow-up will provide knowledge to avoid possible non-conformances in EIA evaluation process in the future. Methodical of this thesis is based on international standards of good practice in EIA follow-up, which should always correspond with the specific circumstances of the project and the specific context. The main principles are results-oriented approach, learning, institutional commitment and responsibility. Meaning of the follow-up is the main research question to evaluate the environmental impact assessment. The thesis evaluates the implementation of the main comments from the various point of views. All opinions, changes and views of all participants must be reviewed in implementation and operation phases of the EIA process. Another sub-section provides a comparison of the noise pollution before and after realization of the project and analytical part concludes evaluate compliance with the general principles of good practice. The results collect comprehensive assessment of the EIA process. The follow-up for Pankrác administrative center was important and it proved that positive cooperation with the investor made processes more effective in the terms of the environmental protection of the area. In the future it would be appropriate to dedicate more effort and time for the follow-up. Especially raising awareness of the existence and positive impact of the entire EIA process and also to protect the environmental and public health.
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Factors affecting postmortem changes in pork meat
Seilerová, Michaela ; Čítek, Jaroslav (advisor) ; Lebedová, Nicole (referee)
The thesis focused on the summary of the quality of pork. The main indicators of the quality of pork and of meat generally together with a chemical composition and the external and internal factors dealing with the quality of meat are described in the thesis. The various histological structure, the variable chemical content, technological features are found in meat. The structure and composition depends on a way of living, the function of the parts of an animal body, on lots of intravital factors (a kind of an animal, breed, male or female, age, the way of nutrition, the state of health). Meat is a valuable source of nutrients and essential acids for a man. The human organism is not able to synthesize the essential acids itself. Lipids are the important part of meat, their main function is storing energy. They are found as a reserve tissue in the subcutaneus parts of animals or among muscular fibre. The amount of carbohydrates contained in meat is not important, meat is low in carbohydrates. They are only important for meat maturation. Meat is high in minerals and vitamins. It is necesary for a man and should be a part of our diet. The important factor for a meat quality is described as a formation of muscular fibres. There are the thin fibres in the meat of a high quality and the thick and fat fibres in the meat of a low quality. The meat quality depends on a number and charactes of animal fibres. The meat of a high quality is for example loin - it is the meat with fine fibres. The next factor which has influence on a meat quality is course of post mortem changes.We can differentiate four stages in these processes: prae rigor, rigor mortis, aging of the meat and deep autolysis. Post mortem aiging processes can deviate from teh standard from variety of reasons and as concequences we can see quality deviation of the meat for example PSE, DFD, RSE, Hampshire efect and cold shortening.Also the breed has the influance on the quality of the meat namely sensitivity to stress,growth characteristic and parameters of slaughter value, other internal factors are age and sex. External factors which has the influance on the quality of the meat are transport of the animals to the slaughterhouse, attitude of the employees during chasing after the animals, the rest before slaughter, stunning itself,bleeding thereafter and cooling down after slaughtery.
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Process management and its use for optimization
Drahorádová, Lucie ; Tichá, Ivana (advisor) ; Lucie, Lucie (referee)
The subject of thesis Process management and its use in optimization is drafting process change in real company and its subsequent implementation. The work focuses on the steps important to the change process, their explanation and subsequent use in practical part. Thesis is divided into two main parts. First part is a theoretical background of the process management and a development of this sector, explanation of key concepts closely related with process management to a description of a specific methods, which play a role in the process of company management.Next part is a practical part where most of the theoretical background was used. Practical work itself is a real-world example of the banking environment, where was actually implemented. Because of a limited possibility to publish the practical part, I do not mention a particular company and the data used for the preparation example are type data - these are not real data. However, the implementation of process changes was set this way and works now, and since it was the optimization, it is therefore expected that this change will bring its savings in the future. Since the implementation of the changes has already occurred, even this assumption was fulfilled and set change of process still generates its savings.
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Motivation as a leadership
Kavina, Daniel ; Fiedler, Jiří (advisor) ; Kala, Štěpán (referee)
This Bachelor Thesis focuses on motivation as a way of leading people. It deals with a research of motivation in relation to leading underlings from the point of view of a headworker, and searches for important motivation factors which could have an influence on employees´ work. The object of the study is to find out how important motivation is when leading people, and to focus on significance of motivation stimuli from the point of view of head workers. The theoretical part of the study deals with high-quality background literary researchwhich can provide adequate resource for the analytical - research part of this work. The theoretical resource includes information which enables us to understand better the general system of motivation from the point of view of head workers. The theoretical part emphasizes the choice of suitable literature allowing summary and comparison of important theoretical pieces of knowledge. The practical part of this Bachelor Thesis concentrates on thorough analyses of data collected through the qualitative research. The research was carried out by means of a controlled-interview method, with the interview outcomes recorded in structured questionnaires prepared in advance. The research sample group was formed by 8 respondents willing to have their interviews recorded. The interviews were followed by drawing concrete conclusions which summarize findings obtained from the research executed. The conclusion part of the study presents objective recommendations resulting from the research findings.
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Motivation as a leadership
Jaroš, David ; Fiedler, Jiří (advisor) ; Horáková, Jana (referee)
This bachelor thesis is about motivation in terms of its use in the managing of people. This work is divided into two main parts, theoretical and personal research. The first part of this work is focused on the theoretical problems of motivation, its explanation from different views and definitions of all theoretical fields that are related to the process of managing people. In the second part, the problems of motivation are looked at from the practical viewpoint. The goal of the practical part was to find out the value of the motivation process to the subordinate employees from the view of the managers. Based on interviews with several managers, their opinions and personal experiences with the motivation process, that they come across on a daily basis, have been summarised.
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