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Articles by Amin U. Khan
Total Records ( 3 ) for Amin U. Khan
  Saqlain Abbas , Ejaz Mehmood Ahmad Qureshi , Farooq Ahmad , Seemal Vehra and Amin U. Khan
  In this study determination of arsenic (As) contamination in the drinking water and urine of children along with its effect on their health status and intellectual functioning was assessed. The study was carried out in order to determine any correlation between intake of arsenic and intellectual functioning level of the children. Raven Standard Progressive Matrices (RPM) was administered on children of (8-15) years of age to assess their intellectual functioning and their health status was checked by measuring their height and weight. Water and urine sample were studied in both experimental and control group. In experimental area Arsenic level was above the World Health Organization (WHO) permissible value which was compared with control area having arsenic level below WHO permissible value in both water and urine. An average 45% of arsenic level in drinking water samples was above WHO permissible value (10 μg/L). Considering urinary arsenic as a biomarker of exposure to arsenic through drinking water, it was found that an average of 50% of children of the experimental group were found to have arsenic in their urine ranging from a concentration of 0.01-0.0119 μg/L. Conclusively, this study showed that the intellectual functioning level of children drinking arsenic contaminated water was significantly lower as compared to those, drinking arsenic-free water.
  Farooq Ahmad , Amin U. Khan and Abdullah Yasar
  Eutrophication of water bodies is matter of concern for the last few decades because wastewater without treatment can cause serious health effects and disturb functioning of ecosystem. The objective of the current study was to utilize nutrient present in wastewater for algal growth and biodiesel production from harvested biomass of algae. Mixed algae culture (Microspora sp., Diatoms, Lyngbya sp., Cladophora sp., Spirogyra sp. and Rhizoclonium sp.) collected from Botanic Garden of Government College University Lahore was grown in artificial ponds of 13.5 L capacity. Algal growth was monitored for six days by measuring its fresh and dry weight which showed almost similar results of 3.34 g/day and 3 g/day respectively. Uptake of total Kjeldahl nitrogen (55%), total phosphorous (61%), nitrate (97%), phosphate (93%), sulphate (34%) and chloride (41%) was carried by mixed algae culture from wastewater. Seasonal variation in the absorption of nutrients in alternate months of the year showed higher uptake in March, September and November due to favorable conditions for algal growth. Yield of biodiesel produced by transesterification of dried algal biomass was calculated to be 15.13% on an average. Quality of biodiesel was analyzed for kinematic viscosity (4.5 mm2/s), flash point (167°C), specific gravity (0.895 g/ml), iodine value (80 mg/g), acid number (0.65 mg. KOH/g) and water contents (32 mg/kg). It was found that the quality of biodiesel was according to the ASTM standards for biodiesel.
  Maqsood Ahmad , Amin U. Khan , Abdul Wahid , Zahid Ali Butt , Muhammad Farhan and Farooq Ahmad
  Water samples were collected from 18 sampling sites including the three hospitals their Municipal Wastewater (MWW) drains receiving the hospital sewage and from the river Ravi. The occurrence and fate of ofloxacin (OFLX) and resistance of Vibrio cholerae due to the presence of OFLX was studied. It was found that 16 out of 18 sites were contaminated by the antibiotic. Highest concentration was observed in hospital wastewater (HWW) ranged from 7.31 to 39.13 μg/L and amount of OFLX in the municipal wastewater before mixing the hospital sewage was 0.26 to 0.43 μg/L and after mixing it raised up to 0.54 to 1.29 μg/L. At the entering point of the MWW drains to the river, concentration 0.44 and 0.31 μg/L were observed in the two drains carrying the HWW to the river, respectively. Upstream concentration from the point of entering of the first and second drains was 0.14 and 0.22 μg/L while the downstream concentration was 0.18 and 0.37 μg/L, respectively. The antibiotic was not detected from both the samples collected from the entering point of the river to the city and before entering of the first MWW drain, whereas the after mixing the first drain the concentration 0.043 μg/L was observed. The bacteria isolated from HWW, MWW drains and the river Ravi were 83% 66% and 83% resistant to OFLX, respectively.
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