Zinc Oxalate Crystal Formation byAspergillus nomius
| Autor: | Thanawat Sutjaritvorakul, Prakitsin Sihanonth, Kallaya Suntornvongsagul, Geoffrey M. Gadd, Anthony J. S. Whalley |
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| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Scanning electron microscope Inorganic chemistry Oxalic acid chemistry.chemical_element Zinc Microbiology High-performance liquid chromatography Oxalate law.invention Metal 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology chemistry law visual_art Earth and Planetary Sciences (miscellaneous) visual_art.visual_art_medium Environmental Chemistry Potato dextrose agar Crystallization General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 33:289-293 |
| ISSN: | 1521-0529 0149-0451 |
| Popis: | This research investigated the ability of an Aspergillus species, isolated from zinc-containing mineral ore, for its ability to transform insoluble zinc oxide (ZnO). It was plated on potato dextrose agar (PDA) medium supplemented with 0.5% (w/v) zinc oxide. Mycogenic crystals were observed under colonies grown in zinc oxide-amended plates. These crystals were investigated by scanning electron microscopy (SEM) and X-ray powder diffraction (XRPD) and identified as zinc oxalate. When compared with zinc oxalate produced by an abiotic reaction, it was found that the crystals were different in their morphology. The production of organic acids in the culture medium was analyzed by high performance liquid chromatography (HPLC). Organic acids are known to be directly involved in metal transformations, especially oxalic acid which plays an important role in metal mobilization and immobilization processes. Increasing heavy metal concentrations in the culture medium caused a significant decrease in the biomas... |
| Databáze: | OpenAIRE |
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