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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Study on resistance of bacteria to selected stress factors
 Miléřová, Miluše ; Samek,, Ota (referee) ; Obruča, Stanislav (advisor)
The aim of the master thesis was to study the effect of the accumulation of polyhydroxyalkanoates (PHA) for bacterial resistance to selected stress factors. In the theoretical part the selected stress factors, polyhydroxyalkanoates and the involvement of polyhydroxyalkanoates into stress response of bacteria were reviewed. In the experimental part we used bacteria Cupriavidus necator H16 and its mutant strain Cupriavidus necator H16/PHB-4 unable of polyhydroxybutyrate (PHB) accumulation. The resistance of above-mentioned bacterial strains against thermal and osmotic stress was tested. According to the results of the experiment, when the bacteria were exposed to three different concentrations of NaCl (50, 100 and 200 g/l) PHB accumulating strain showed a higer resistance to hyperosmotic stress than the strain unable of PHB accumulation. There was demonstrated with Raman spectroscopy that in the hyperosmotic environment induced crystallization of the intracellular PHB granules. Transmission electron microscopy indicated that strain Cupriavidus necator H16/PHB-4 is subject to plasmolysis during hyperosmotic stress. As a consequence the hyperosmomotic stress occurs to the aggregation intracellular PHB granules in strain Cupriavidus necator H16 but there is no plasmolysis or is much less intensive.
Detailed record
Study on resistance of bacteria to selected stress factors
 Miléřová, Miluše ; Samek,, Ota (referee) ; Obruča, Stanislav (advisor)
The aim of the master thesis was to study the effect of the accumulation of polyhydroxyalkanoates (PHA) for bacterial resistance to selected stress factors. In the theoretical part the selected stress factors, polyhydroxyalkanoates and the involvement of polyhydroxyalkanoates into stress response of bacteria were reviewed. In the experimental part we used bacteria Cupriavidus necator H16 and its mutant strain Cupriavidus necator H16/PHB-4 unable of polyhydroxybutyrate (PHB) accumulation. The resistance of above-mentioned bacterial strains against thermal and osmotic stress was tested. According to the results of the experiment, when the bacteria were exposed to three different concentrations of NaCl (50, 100 and 200 g/l) PHB accumulating strain showed a higer resistance to hyperosmotic stress than the strain unable of PHB accumulation. There was demonstrated with Raman spectroscopy that in the hyperosmotic environment induced crystallization of the intracellular PHB granules. Transmission electron microscopy indicated that strain Cupriavidus necator H16/PHB-4 is subject to plasmolysis during hyperosmotic stress. As a consequence the hyperosmomotic stress occurs to the aggregation intracellular PHB granules in strain Cupriavidus necator H16 but there is no plasmolysis or is much less intensive.
Detailed record

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