|
|
Oxalates in rocks and plants
Novotná, Julie ; Jehlička, Jan (advisor) ; Hruška, Jakub (referee)
SUMMARY: The presence of oxalates is widespread not only as kidney stones, but in whole nature. It is well known that oxalates are products of some plants, fungi and lichens. The accumulates of calcium oxalates are increased in: sorrel, rhubarb, spinach, soya, dieffenbachia, etc. Oxalates serve many important functions in plants such as calcium regulation, protection from herbivory and metal detoxification. Aluminum detoxification is ability of plants, which is critical factor for crop production. Breeding of commercially viable low oxalate cultivars or genetic manipulation with crops should deal to enhance of nutritional quality and enhance of agricultural production too. The presentation of oxalates in rocks is well representing by calcium oxalate minerals, whewellite and weddellite. Minerals occur in sediments into precipitated forms within concretions and hydrothermal veins or dispersed form into modern sediments, e.g. peats. Oxalates are biologic products, therefore they can indicate biological activities, so oxalates should be sought for researching on cosmic objects. The observation of oxalates on Earth and interpretation of the Raman spectra is necessary in these types of study.
|
|
|
Computational Study of the Interaction and adhesioin energies of polyaniline models with surfaces of the selected materials.
Maixner, Michal ; Burda, Jaroslav (advisor) ; Tokarský, Jonáš (referee)
This work is focused on the properties of polyaniline placed on the model of silicate surface, namely its adhesion energy and spectra of polyaniline with different charge, computed by means of quantum chemistry. Computed spectra were compared with experimental data. The DFT metod ω-B97XD with 3-21G base was used for optimalization of the complex model and for determination of vibrational spectra the DFT metod ω-B97XD with 6-31G(d,p) base was used. Evaluation of the adhesion energy DFT metod ω-B97XD with 6-31G* base was used. The adhesion energy computed by interpolation to infinite polymer was 1,9kcal/mol. Computed Raman spectra was fit to experimental data. Spectrum found by this metod was similar to experimental in some aproximation, but more detail look would reavel some differences caused by not including of enviroment and of interaction between polyaniline
|
|
|
Oxalates in rocks and plants
Novotná, Julie ; Hruška, Jakub (referee) ; Jehlička, Jan (advisor)
SUMMARY: The presence of oxalates is widespread not only as kidney stones, but in whole nature. It is well known that oxalates are products of some plants, fungi and lichens. The accumulates of calcium oxalates are increased in: sorrel, rhubarb, spinach, soya, dieffenbachia, etc. Oxalates serve many important functions in plants such as calcium regulation, protection from herbivory and metal detoxification. Aluminum detoxification is ability of plants, which is critical factor for crop production. Breeding of commercially viable low oxalate cultivars or genetic manipulation with crops should deal to enhance of nutritional quality and enhance of agricultural production too. The presentation of oxalates in rocks is well representing by calcium oxalate minerals, whewellite and weddellite. Minerals occur in sediments into precipitated forms within concretions and hydrothermal veins or dispersed form into modern sediments, e.g. peats. Oxalates are biologic products, therefore they can indicate biological activities, so oxalates should be sought for researching on cosmic objects. The observation of oxalates on Earth and interpretation of the Raman spectra is necessary in these types of study.
|
|
|
Principal component analysis of Raman spectroscopy data for determination of biofilm forming bacteria and yeasts
Šiler, Martin ; Samek, Ota ; Bernatová, Silvie ; Mlynariková, K. ; Ježek, Jan ; Šerý, Mojmír ; Krzyžánek, Vladislav ; Hrubanová, Kamila ; Holá, M. ; Růžička, F. ; Zemánek, Pavel
Many microorganisms (e.g., bacteria, yeast, and algae) are known to form a multi-layered structure composed of cells and extracellular matrix on various types of surfaces. Such a formation is known as the biofilm. Special attention is now paid to bacterial biofilms that are formed on the surface of medical implants, surgical fixations, and artificial tissue/vascular\nreplacements. Cells contained within such a biofilm are well protected against antibiotics and phagocytosis and, thus, effectively resist antimicrobial attack.\nA method for in vitro identification of individual bacterial cells as well as yeast colonies is presented. Figure 1 shows an an example of the biofilm formed by Staphylococcus epidermidis bacteria and Candida parapsilosis yeasts known for forming biofilms. The\npresented method is based on analysis of spectral “Raman fingerprints” obtained from the single cell or whole colony, see figure 2(top). Here, Raman spectra might be taken from the biofilm-forming cells without the influence of an extracellular matrix or directly form the bacterial/yeast colony.
|
|
| |
|
| |
|
| |
|
| |
guest ::
