Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XIX
Written by Carmen Madalina CISMASIU
Successful biodegradation process of different complexes required attention to biological parameters (such as choice of microorganisms), control of the chemical and physical environment (pH, redox potential, temperature and metallic ions) and consideration of the metal mines condition. In this context, the present paper presents the study regarding the main interactions between acidophilic bacteria and toxic metal ions can occur through active processes, involving the metabolic sequences of living microorganisms or passive processes, independent of cellular metabolism. The acidophilic bacterial cultures used in the degradation experiments of organic compounds were selected on the basis of their capacity to hydrolyse the starch in the presence of different inorganic forms of heavy metal ions The heterotrophic bacterial capacity by producing organic acid was very high, which confirm the adaptation of these populations to higher concentrations of heavy metallic ions. Comparative results bring an improved bacterial growth and sensitivity to specific environmental conditions and bacterial populations although the effect is not maintained after longer times. Our analysis regarding the efficiency of extracellular enzymes from Acidiphilium populations shows continuous agitation conditions (21 days) in the presence of 2-3g/l starch induce an increased extracellular hydrolytic activity (50-60%) when sulphates is present in the environment.
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