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- W2006041215 abstract "The effects of varying carbon, nitrogen, phosphate and sulphate source on solubilization of natural gypsum by Aspergillus niger were assessed. The fungus was grown on Czapek Dox agar amended with 0.5% (w/v) gypsum. Solubilization activity was monitored by measuring the clear zone formed underneath and around the growing colonies. On different concentrations of glucose, nitrate, ammonium, urea, phosphate and sulphate, linear growth rate [Rg] was not significantly correlated with gypsum solubilization rate [Rs], but the solubilization ratio [Rs/Rg] was increased by increasing the concentration of glucose, nitrate, and urea. On ammonium nitrogen, the mycelial dry weight was negatively correlated with linear growth, and gypsum solubilization activity was markedly lower than that on nitrate or urea. Gypsum solubilization was strongly correlated with both biomass dry weight and oxalic acid production. The fungus was unable to grow on carbonate, as a carbon source, but the addition of sucrose alleviated the effect of alkalinity caused by sodium carbonate. The optimum C:N ratio for gypsum solubilization was 50:1, and the importance of phosphate, rather than sulphate, was also shown. Implication of critic acid in the solubilization process was also suggested. This work emphasizes the importance of organic acids, particularly oxalic acid, production by fungi in gypsum solubilization and revealed the optimum nutritional conditions for the solubilization process." @default.
- W2006041215 created "2016-06-24" @default.
- W2006041215 creator A5031655886 @default.
- W2006041215 date "2000-05-01" @default.
- W2006041215 modified "2023-10-16" @default.
- W2006041215 title "Nutritional effects on oxalic acid production and solubilization of gypsum by Aspergillus niger" @default.
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- W2006041215 doi "https://doi.org/10.1017/s0953756299001707" @default.
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