Tolerance of Chemoorganotrophic Bioleaching Microorganisms to Heavy Metal and Alkaline Stresses

Figure 7

Visualization of the inhibition zones in the plate diffusion test for the investigation of the effect of (a) buffer solution, (b) 1000 ppm (13.35 mM) As(III), (c) 1000 ppm (13.35 mM) As(V), (d) 1000 ppm (8.90 mM) Cd(II), (e) 600 ppm (5.34 mM) Cd(II), (f) 400 ppm (3.56 mM) Cd(II), and (g) 100 ppm (0.89 mM) Cd(II) on the growth of Aspergillus niger.

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(b)

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(g)