Fig. 4

Comparison of the total produced EPSs (μg/ml) a, Protein (mg/ml) b and Carbohydrates (μg/ml) c of Nostoc sp. N27P72 and Nostoc sp. FB71 in lyophilized EPSs containing maltose and metal solution of Cu (II), Cr (III), and Ni (II). The data present three independent experiments using triplicate samples and mean ± SE values were expressed. The same letters of each line graph are not significantly different from each other, using one-way ANOVA (p < 0.05). Symbols indicate () for Nostoc sp. N27P72 and () for Nostoc sp. FB71