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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.
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Physico-chemical properties of oxamic and glyoxylic acids and their affinity to lanthanides
Zakharanka, Anastasiya ; Tyrpekl, Václav (advisor) ; Šubrt, Jan (referee)
This bachelor work focuses on studies of chosen aspects of the basic physicochemical properties of oxamic and glyoxylic acids and their affinity to lanthanides, cerium, and gadolinium taken as the representatives. Room temperature solubilities, pKa values, thermal and photochemical stability of the acids have been evaluated. The acids' affinity to lanthanide (III) ions in an aqueous solution has been studied using various conventional laboratory techniques and instrumental methods. Lanthanide oxalate decahydrates have been synthesized using heterogeneous and homogeneous precipitation routes and characterized using classical solid-state analytical techniques. Keywords: oxalic acid precipitation, oxamic acid, oxamates, oxalates, glyoxylic acid, f-block metals chemistry
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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.
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