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Direct Red 80 is a commercially produced azo dye commonly used in textile industry. It belongs to a significant group of textile dyes with high chemical stability and resistance to biodegradation. Microscopic fibrous fungi of the genus Aspergillus, as they were isolated from the sludge lagoon (a place significantly polluted by industrial organics), were utilized for biodegradation of the dye. Experiments on static cultivation took place for 10 and/or 20 days, and the results obtained showed the ability of all appl...