National Repository of Grey Literature 126 records found  previous11 - 20nextend  jump to record: Search took 0.04 seconds. 
Characterization of yeast and algae metabolites by instrumental techniques
Kurowska, Klára ; Márová, Ivana (referee) ; Němcová, Andrea (advisor)
The presented diploma thesis deals with the analysis and production of selected microbial metabolites of the yeast Rhodotorula kratochvilovae in comparison to various species of microalgae. The theoretical part summarizes the knowledge about the conditions for optimal growth and production of secondary metabolites. Analytical methods, by which metabolites were quantified and evaluated, were also described. In the experimental part of this thesis, the amount of accumulated biomass, exoglycolipids, intracellular lipids, phycobiliproteins and carotenoids according to various nutrient sources in the culture medium was studied. Specifically, the yields of these metabolites were investigated in the utilization of various sources of nitrogen (yeast extract, urea, ammonium sulfate, ammonium chloride and potassium nitrate), carbon (glucose, mannose, xylose, glycerol and lactose) and at variable C / N ratios (20; 40; 70; 100 and 120: 1) ideally selected sources of observed nutrients in partial experiments. The last part of the experiment was focused on comparison of the analysis of metabolites of autotrophic algae (chlorophylls, phycobiliproteins and lipids).
Production of magnetic particles by microorganisms
Chvalkovská, Eva ; Mgr. Martina Mikešová, Ph.D. (roz. Pravečková) (referee) ; Trachtová, Štěpánka (advisor)
This thesis focuses on the magnetic nanoparticles produced by bacteria. These are two types of bacteria. First of them we can find in an industrial environment that produce magnetic nanoparticles using magnetosomes. Magnetosomes are units containing nanocrystals and are surrounded by a lipid layer. They are made up of chains and work as a compass. In this thesis I deal with possibilities of cultivation od these bacteria, acquisition of magnetosomes and subsequent processing. The second type is bacteria living in the human body, they start to produce magnetic nanoparticles after the addition of trigger, such as silver nitrate. Bakteria which can produce silver or ferrous nanoparticles are Bacillus sp, Escherichia coli, Lactobacillus casei ssp. casei and Lactobacillus fermentum. Experimental part of bachelor thesis focused on the production of silver nitrate in concetration of 0,1; 1; 2; 4 mM. The bacteria that have been shown to produce silver nanoparticles are Lactobacillus casei ssp. casei CCM 7088T a Lactobacillus casei ssp. casei CCM 7089 a Lactobacillus rhamnosus CCM 1825T.
Production of carotenoids grown on waste fat
Holub, Jiří ; Němcová, Andrea (referee) ; Márová, Ivana (advisor)
Carotenoids are lipid-soluble pigments which are contained in plants and microorganisms. Carotenoids are known for their antioxidant effects. Lipids are predominantly non-polar substances, which are essential and present in all types of organisms. The research was made by theoretical and practical form. It was dealing with production of carotenoids pigments and different lipophilic substances by yeasts of Rhodotorula glutinis, Rhodosporidium toruloides and Sporidiobolus metaroseus, cultivated in media containing waste fat or glycerol. Further, methods for obtaining lipid substances from microorganisms and with further analysis of samples by gas or liquid chromatography were optimized. The main task of the research was to find out which types of media and yeasts are the most suitable for production of lipid substances. For production of lipid substances in glycerol media, as the best producing strain Rhodosporidium toruloides was found, which simultaneously reported the highest concentrations of carotenoids on fatty and fatty hydrolyzed media.
Use of algae for production of biomass and bioproducts
Slonek, Jaroslav ; Máša, Vítězslav (referee) ; Brummer, Vladimír (advisor)
Submitted bachelor thesis is focused on description of use of algae for biomass and bioproducts production. The first part of the thesis is devoted to the taxonomic classification of algae and a basic summary of the characteristics of the different algal groups. The next part is aimed at bioproducts, which are obtained by algae cultivation and possibilities of further processing for energy purposes are also described. As for the cultivation, the emphasis is on modern methods in this area, i.e. on the possibility of using waste products in the culture process. In the next part, technological parameters of cultivation are discussed, for instance effects of technological parameters on growth and composition of biomass and production of desired products. The next chapter summarizes types of used culture bioreactors in which the growth of biomass occurs in a controlled environment. The information obtained and collected in the thesis is further discussed and summarized in the conclusion.
Control of algal bioreactors
Rek, David ; Naď, Martin (referee) ; Máša, Vítězslav (advisor)
The bachelor’s thesis discusses the matter of cultivation of microalgae in an artificially altered environment – bioreactor. The aim of the thesis is to determine and present the factors influencing the growth of microalgae and to find means of automated regulation of such factors. Nowadays, the majority of bioreactors are laboratory ones and are mostly being operated manually. The recent increase in demand for this technology results in many pilot-plant tests with a wide variety of microalgae. Tests such as these will be required to be automated to serve properly in future research. The thesis is based on professional literature and articles. The first part is to familiarize the reader with the wide number of potential applications of microalgae technology in various fields, such as the food industry, water treatment or separation of CO2 from ambient air or waste gas. The next segment presents the factors influencing the growth of microalgae and lastly the system of required equipment and sensors for automated operation is described. The bachelor’s thesis summarizes the important information necessary for the construction and unattended operation of microalgae bioreactor with respect to maximalization of productivity.
Optimization of the Methodology for Assessment of Biochar Effect on the Growth of Model Plants
Štorková, Natálie ; Enev, Vojtěch (referee) ; Kalina, Michal (advisor)
This bachelor thesis is studying the effect of biochar on the growth of model plant and deals with the optimalization of the methods for assessing its impact. Theoretical part describes the properties and utilization of soil conditioners, special attention is focused on biochar. According to the literature research, maize (Zea mays) was chosen as a model plant for cultivation experiment and subsequently the application doses of biochar were also defined. The cultivation experiment took place in growing box under controlled illumination and irrigation. Plant dry weight weighing after cultivation, continuous measurement of plant height during the cultivation and also image analysis of the root system were used for evaluating the influence of biochar on quantitative and qualitative properties of model plants. From obtained data it can be summarized that the growth differences were influenced by the application dose, the type of biochar and also by type of soil, which was used for the cultivation experiment.
Factors influencing the quality of red wine
Zechmeisterová, Lucie ; Vránová, Dana (referee) ; Omelková, Jiřina (advisor)
In my thesis, I focused on monitoring of microorganisms in the sample of red grape juice and on the interactions between yeasts, bacteria and filamentous fungi. Three different media were applied for the cultivation of microorganisms; firstly for monitoring of total volume of microorganisms, secondly for yeasts and third time for lactic acid bacteria. The indirect method was used for the determination of the amount of viable cells. This method consists in enumerating of visible macroscopic colonies grown up on agar plates. When the cells grew up, the forms of colonies were analyzed visually and the morphology of microorganisms was detected microscopically. The operating time of enzymes in grape juice in the production of red wine was monitored after application of commercial enzymatic preparation. The enzym action in grape juice was observed on the basis of the process of degradation of high – molecular substrate by enzymes through the use of Ubbelohd´s viscometer. The research findings provided a lot of knowledge about the occurance of microflora in the process of production of red wine. The commercial preparations added to grape juice played a significant role.
CO2 reduction with algae
Naider, Jakub ; Rebej, Miroslav (referee) ; Vondál, Jiří (advisor)
The aim of this final thesis is the process of algae cultivation their use for carbon dioxid reduction. The main objective of this work is the mass and heat balance of the photobioreactor and the design of a temperature control system. Within the research work, an overview of certain types of bioreactors and photobioreactors, the current situation around the climate and the impact of the cultivation of algae on carbon dioxide emissions. The model for temperature control and mass transfer of a plate photobioreactor is created in this work.
Issues of the algae Chlorella production in flow bioreactors
Jankovičová, Kristína ; Lukavský,, Jaromír (referee) ; Svěrák, Tomáš (advisor)
Microalgae invite the attention of scientists due to their unique properties, including their quick growth, accumulation of lipids and other valuable substances, fixation of carbon dioxide and treatment of wastewater. This master´s thesis is focused on the study of microalgae. The main goal is to understand and describe the process of microalgae cultivation, in order to optimize it. The theoretical part of this thesis deals with microalgae (mainly Chlorella sp.) characterization, its practical use and cultivation optimization in order to obtain the highest concentration of biomass. The experimental part is divided into three tasks. Aim of the first task was the comparison of the course of autotrophic and heterotrophic cultivation of various strains of Chlorella and Coccomyxa microalgae, using three different cultivation media – synthetic medium for chlorella cultivation and natural fertilizer, Florium, used in two different concentrations (diluted 50 and 20 times). The highest Chlorella sp. biomass concentration of 7,10 g/l was achieved in the synthetic heterotrophic medium. Second task was focused on monitoring of the growth of algae Coccomyxa and Chlorella strain C1A, with respect to temperature and light intensity, using various combinations of these two important growth factors. Chlorella achieved its highest concentration of 11,46 g/l when grown at temperature of 33,5 °C and light intensity of 320 µE.m2.s1. The third and final task was to observe the growth of Dictiosphaerium chlerelloides microalgae on a flat cascade bioreactor. The experiment led to the discovery that these algae were able to grow at temperatures of around 10 °C, at which many well-known commercial algae, such as Chlorella sp. or Arthrospina sp., simply wouldn’t grow.
Production of carotenoids and other metabolites by yeast using selected food wastes.
Chujanov, Oleg ; Šimanský, Samuel (referee) ; Szotkowski, Martin (advisor)
This bachelor thesis is focused on the issue of yeast cultivation with the usage of waste sub-strates from the food industry on a laboratory level. Carotenogenic yeasts are microorganisms capable of processing food waste substrates and use them as a source of organic nutrients for growth. This thesis consists of a practical as well as theoretical part. The experimental section focuses on the description of different strains of yeasts, metabolites and types of waste sub-strates. The two main substrates chosen for this research were chicken fat and chicken fe-athers. The yeast types used in this thesis were Rhodotorula kratochvilovae (CCY 20-2-26), Rhodosporidium toruloides (CCY 62-2-4), Cystofilobasidium macerans (CCY 10-1-2), Spo-ridiobolus pararoseus (CCY 19-9-6), Rhodotorula mucilaginosa (CCY 20-9-7), Rhodotorula mucilaginosa (CCY 19-4-25) and Sporidiobolus metaroseus (CCY 19-6-20). These strains reported high production values of the metabolites researched in this thesis. The strains Rho-dosporidium toruloides (CCY 62-2-4) and Sporidiobolus metaroseus (CCY 19-6-20) were chosen for the production of metabolites from waste substrates, for those reported the most promising results.

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