This study was carried out to evaluate the potential of Nostoc piscinale TISTR 8401 in the biodegradation of used motor oil. Experiments were performed by incubating cyanobacteria in liquid Nfree medium amended with 0-15% used motor oil for a period of 14 weeks. It was found that the cyanobacteria performed the best in the biodegradation of used motor oil when 3% oil was applied. Net percentage loss of total petroleum hydrocarbons was 21%. Biomass and total proteins dramatically increased by 0.0457 g (682.09%), and 170.97 mg/ml, respectively. However, chlorophyll a content dropped by 3.609 µg/ml (36.57%).
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