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Articles by Ayesha Tabasum
Total Records ( 1 ) for Ayesha Tabasum
  Ali Abbas Qazilbash , Rani Faryal , Ayesha Tabasum , Asima Lodhi , Safia Ahmad and Abdul Hameed
  Over the years, with the active spread and development of the industries, heavy metals, which are either used, or produced, as by-products, by numerous manufacturing, industrial, refining and mining processes, have become ubiquitous, persistent environmental pollutants. Bioremediation is a cost-effective technology that may be used to remove a variety of pollutants and contaminated sites. This study was designed to compare the capabilities of identified Aspergillus niger strains in the oven-dried (dead) and non-growing (living) forms to adsorb Lead (Pb) from SDB media containing the HM under optimized laboratory conditions using the shake-flask incubation method. Aspergillus niger showed a higher percentage of Pb adsorption in the oven-dried, as compared to the non-growing state. Furthermore, the adsorption by oven-dried strains was also high at higher concentrations of the heavy metal, whereas adsorption of Pb effectively took place at the low concentration levels for the non-growing strains. Analysis of the correlation matrices showed significant positive correlation between strains at high Pb concentrations under the oven-dried condition and significant positive correlation at low Pb concentrations under the non-growing conditions. The percentage Pb adsorption of both strains under oven-dried conditions was over 90% for the concentration range of 100-500 ppm, with the highest being 99.95% at 500 ppm for strain NP 18 after 80 min of incubation. Furthermore, for the non-growing strains this maximum adsorption was achieved for the concentration range of 100-300 ppm and that too was 96.37% achieved by strain NP 17 at 300 ppm concentration after 30 min, after which the toxic effects of the HM on the live fungal strains diminished their capacity to adsorb the metal. When comparing the two biotreatment regimens of oven-dried fungal biomass, verses the use of non-growing pellets of fungi, there is overwhelming evidence to support the use of the former as a method to removal HM contamination from polluted sites, particularly at high concentration levels.
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