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Plant synapses: more than a metaphor?
Pavlovic, Jakub ; Cvrčková, Fatima (advisor) ; Sikorová, Lenka (referee)
Synapses are generally defined as places where cell-to-cell signal transmission especially between neurons can occur, involving transmission of signal by local recycling of exo- and endocytosis vesicles. Possible existence of synaptic signal transduction in plants is still subject of discussion. However, existence of plants homologues of proteins related to those found in synapse support this theory. Cell-to-cell contacts similar to electric, immunological and chemical synapses were described in plants. Here I describe some proteins involved in function or synapse development whose plant homologs are known, or were discovered by myself. Protein RHD3 was described as ortholog of mammalian atlastin. Mutation in atlastin cause hereditary spastic paraplegia where morphology of long axons is changed. Similar change of cell morphology is found also in rhd3 mutans, whose root-hairs have altered phenotype. These root-hairs are shorter and posses wavy appearance. Further I succeeded in identification of possible homolog of two other proteins. It is homolog of Dlg-MAGUK, which is involved in proper function and synapse development. Second whose possible homolog I found is RIMs- BP 2. RIMs-BP 2 forms bifunctional connections between fusion apparatus of synaptic vesicle and Ca2+ channels. Last protein was...
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Factors controlling tuberization in potato
Suchomel, Ondřej ; Lipavská, Helena (advisor) ; Sikorová, Lenka (referee)
Tuberization of potato plants (Solanum tuberosum L.) is a morphogenetic process of stem transformation into the storage organ - tuber. Tubers emerge preferentially on the underground part of the stem - stolon. Tuberization induction depends on the signals from external environment (primarily photoperiod) and internal plant status. Development of tuber represents a complicated sequence of growth processes regulated primarily by phytohormons with the prominent function of gibberellins and cytokinins. Organs correlations and communication among different parts of plant body plays also very important role in the process. Apart from changes in morphology and cell division occurring in early stages of stolon transformation tuber formation and growth is also accompanied by important metabolic changes. This bachelor thesis is based on a literature review focused on control factors influencing potato tubers formation. The first part of my thesis is devoted to internal factors represented especially by phytohormons. The second part describes the effects of external factors, namely photoperiod, availability of nitrogen and temperature. Key words: Phytohormones, potato, Solanum tuberosum, stolon, induction of tuberization, saccharides
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Model of e-business
Sikorová, Lenka ; Smejkalová, Helena (referee) ; Dvořák, Jiří (advisor)
This Master’s thesis deals with the theme of „Model of e-business for humi.cz keeping by Humi Outdoor, s. r. o. company.” Based on the analysis of the electronic shop and system for its creation and e-shop administration is proposed kind of solutions proceedings for electronic shop. The solutions will ensure not only the increasing of credibility and image of electronic shop, but they will lead also to increasing of sales volume and thereby to higher profit of company and to competitiveness enlargement
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Audit of human resources
Sikorová, Lenka ; Stříteský, Marek (advisor) ; Pavelka, Jan (referee)
The diploma thesis focuses on the theory of HR audit and conducting an HR audit in a real company. The theoretical part of the diploma thesis consists of explanation of terms audit and HR audit, descriptions od HR systems in organizations, descriptions of main tasks, duties and roles of HR department and brief description of the situation in the Czech Republic. It is then described in the practical part od the diploma thesis how the HR audit went, what all steps of conducting an HR audit were and what the conclusion and recommendations were.
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