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Rhizopus oryzae RUR709 mutant was isolated based on halo size from selection medium via mutagenesis with UV and γ-rays, and the production of fumaric acid in the submerged fermentation was assessed. The maximum concentration of fumaric acid was obtained using 0.5% corn steep liquor (CSL) as the nitrogen source. Organic nitrogen sources were shown to be more effective in fumaric acid production than...
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