Manifiesta que la minería metálica constituye la actividad económica que genera mayores ingresos fiscales al Perú, pero también es la responsable del origen de los Pasivos Ambientales Mineros (PAM), contaminando diversos ecosistemas. Estos PAM contienen metales pesados que son tóxicos para todas las formas de vida conocidas. En la naturaleza existen microorganismos como los hongos que toleran y resisten la toxicidad de estos metales pesados. Como mecanismo de defensa, las levaduras modifican su actividad metabólica, incluyendo la expresión positiva o negativa de ciertos grupos de proteínas con diversas actividades biológicas; proteínas que participan controlando el estrés oxidativo, como catalasas, superóxido dismutasa, peroxirredoxinas, tiorredoxinas, glutatión peroxidasa, entre otras; también proteínas queladores de metales como metalotioneínas, fitoquelatinas y tripé...

This work describes the isolation and selection of bacterial strains of the genus Pseudomonas in Cetrimide, Acetamide and King B Agar media, from effluents of the leaching process and from the tailings deposit of the gold ore processing plant, Caraveli - Arequipa. Subsequently, the adaptation was made in Modified Mineral Medium (M9M), to different concentrations of sodium cyanide, to evaluate the tolerance and degradation of the CN- radical. The results of sowing in different nutrient media allowed us to observe changes in coloration with a change from clear to intense red in Acetamide Medium and from clear to fluorescent green in King B Agar Medium, revealing the presence of P. pseudoalcaligenes bacteria. Similarly, during the adaptation process of a strain whose initial cell population was 2.0E+06 CFU/mL, in media supplemented with 50, 100, 150, 200 and 250 ppm of Free Cyanide, at the ...

The correlactionship of bacterial population and oxidation-reduction potential in the bioleaching of sulfuric minerals by bacterial strain of Aciditiobacilus Ferrooxidans isolated from acid mine effluent was studied. The solubilization of copper and gold release from a mineral with sulphides exceeding 80% was evaluated. The experimental variables were: Pulp density at 1, 2 and 6% (W/V), concentration of ferrous sulfate as part of the 9k medium of 0, 3, 6, 9 and 15 gr/L.; maintaining constant temperature and pH. The tests were carried out in three consecutive stages, starting with inoculum containing 7.05x107 Cell/mL and then the one obtained in each previous stage, observing the variation in the periods of adaptation and growth. In the first stage the maximum bacterial density reached in 24 days was 4.75x107 Cell/mL with 6 g/L of ferrous sulfate. In the second stage a maximum density of ...