title: Assessment of the effect of the toxicity of a textile dye on Nostoc muscorum ISU, a diazotrophic cyanobacterium.
abstract: The impact of graded concentrations (5, 10, 15 and 20 mg dm(-3) of acid mordant Metomega Chrome Orange GL, a common dye used in woollen, carpet and textile industries, was studied on protein and pigment content and photosynthetic oxygen evolution in a diazotrophic cyanobacterium Nostoc muscorum. The lower concentration of 5 mg dm(-3) showed a negligible effect on protein and pigment content and photosynthetic oxygen evolution, whereas at higher concentrations a drastic decrease in the above parameters was observed. The highest concentration of 20 mg dm(-3) resulted in a decrease of protein, chlorophyll a, phycocyanin and carotenoid content by 72, 76, 54 and 17% of the control, respectively. Photosynthetic oxygen evolution also decreased by 92% of the control at this concentration of the dye.
authors.affiliation: Centre of Advanced Study in Botany, Faculty of Science, Banaras Hindu University, Varanasi-221 005, India.
authors.forename: S P
authors.initials: SP
authors.lastname: Shukla
authors.forename: A
authors.initials: A
authors.lastname: Kumar
authors.forename: D N
authors.initials: DN
authors.lastname: Tiwari
authors.forename: B P
authors.initials: BP
authors.lastname: Mishra
authors.forename: G S
authors.initials: GS
authors.lastname: Gupta