Abstract
The impact of graded concentrations (5, 10, 15, and 20 mg L−1) of Omega Chrome Red ME, a common dye used in woollen, carpet, and textile industries, on protein production, pigment content, and photosynthetic oxygen evolution in a diazotrophic cyanobacterium Nostoc muscorum ISU, was studied. All concentrations were found to be inhibitory, with lower concentrations (5 mg L−1) producing a negligible effect, while higher concentrations produced a dramatic decrease in the parameters observed. The highest concentration of dye tested (20 mg L−1) resulted in a decrease in protein, chlorophyll a, phycocyanin, and carotenoid content of 82.20, 82.69, 46.20 and 41% of control, respectively. Photosynthetic oxygen evolution was decreased by 83.50% of control at the highest dye concentration. © 1994 by John Wiley & Sons, Inc..
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