Tolerance of Chemoorganotrophic Bioleaching Microorganisms to Heavy Metal and Alkaline Stresses

Table 1

Biomass dry weight concentration (g/L) after 96 hours as a function of initial pH during the growth of Bacillus mucilaginosus in nutrient broth medium and of Aspergillus niger in potato dextrose broth medium.

pH	Bacillus mucilaginosus	Aspergillus niger
9.0	0.88	0.55
11.0	0.26	1.23
12.0	No growth	1.36
13.0	No growth	Negligible