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Articles by Rashida Kanwal
Total Records ( 2 ) for Rashida Kanwal
  Toqeer Ahmed , Rashida Kanwal and Najma Ayub
  The various strains of lactic acid producing bacteria such as S. cremoris and L. lactis and L. acidophilus isolated from the camel milk, were examined for their optimum growth temperatures, generation time, pH and acidity. All these strains grew rapidly at their respective optimum temperatures; however their generation time and pH varied. L. acidophilus strains showed greater generation time varied from 123.01 to 135.08/min and showed 0.85-0.96% acidity and 4.40-4.81 pH values, respectively while for L. lactis and S. cremoris generation time varied from 60.17 to 87.16/min and 64.9-80.0/min, respectively. S. cremoris and L. lactis produced 0.51-0.55% and 0.56-0.58% acidity and showed 4.7-4.79 and 4.80-4.89 pH values at their respective optimum temperatures. The optimum growth temperature for L. lactis and L. acidophilus was found to be 37 to 40°C while for S. cremoris was 37°C. There was inverse relationship between acidity, pH and generation time. It was observed that there was a correlation between the acidity, pH and generation time and there was also an inverse relationship between total titratable acidity and pH values of each strain.
  Toqeer Ahmed , Rashida Kanwal , S.S. Tahir and Naseem Rauf
  In present study, drinking surface water of different dams, located in Rawalpindi / Islamabad region, was analyzed. Water samples were observed bacteriologically for total viable count and total coliform count by heterotrophic plate count and MPN method. Pathogenic bacteria were isolated from water samples collected from different dams and related filtration plants and identified by different bio-chemical tests. Water samples contain different pathogenic bacteria like Bacillus cereus, E. aerogens, S. aureus, E. coli, Salmonella spp., Shigella spp. and Streptobacillus spp. In all filtration plants, chlorine, a sterilizing agent and the main co-agulant, Alum sulphate, was used. Growth of Coliforms was observed after chlorination in water samples, collected from Rawal dam filtration plant. While no growth of any microorganisms was observed after chlorination in case of Simly dam and Khanpur dam filtration plants but water sample taken from storage of Khanpur filtration plant after filtration and chlorination, was also contaminated. The objective of this study was to check the quality of drinking water and comparative analysis of different dams (Rawal, Simly and Khanpur) and related filtration plants which supplying water for drinking and other purposes to different inhabitants of Rawalpindi and Islamabad after filtration and chlorination.
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