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Articles by Shahid Mahboob
Total Records ( 4 ) for Shahid Mahboob
  Shahid Mahboob and Muhammad Zahid
  The seasonal variations of Rakh Branch canal were studied. Air and water temperature varied from 17-43 and 15-410C, respectively. The other variables were varied as light penetration 16-29 cm, pH 7.8-8.5, electrical conductivity 0.15-1.4 dsm‾1, dissolved oxygen 1.9-3.4, total alkalinity 237-290, carbonates 46-80, bicarbonates 189-210, total hardness 167-237, calcium 31-44, magnesium 17-37, sodium 14-25, potassium 1.6-5.4, phosphates 0.0-0.103, nitrates 0.43-3.46, total solids 925-1178 and total dissolved solids 796-983 mg l‾1 . Productivity based on dry weight of planktonic biomass was ranged from 111-229 mg l‾1. The total twenty two genera of phytoplankton and zooplankton were recorded which varied significantly during different periods of the study because of season.
  Mushtaq Ahmad , David G. Smith and Shahid Mahboob
  The effect of NaCl on heat tolerance of Enterococcus faecium BAR1 and Enterococcus faecalis MI2 was determined at 55, 60 and 62.5oC for half an hour. Cells of both isolates were grown in Brain Heart Infusion broth containing 6.5% NaCl. Exponential phase cells were used as inoculants. Cells of both isolates were found resistant to heat treatment as compared with cells grown in BHI broth without presence of salt. The decimal reduction times (D-values) were determined by 1 log fall in viable count. Both isolates showed similar results at 55oC but at 60oC E. faecalis MI2 showed higher D-value than E. faecium BAR1. At 62.5oC E. Faecium BAR1 was found more tolerant to heat treatment than E. faecalis MI2. Experiments showed that the presence of salt in the growth medium induces more heat tolerance in enterococci than the cells grown in normal medium.
  Mushtaq Ahmad , David G. Smith and Shahid Mahboob
  Effect of pH of the growth medium on heat tolerance was investigated in Enterococcus faecium BAR1 and Enterococcus faecalis MI2. The heat tolerance was determined at 55, 60 and 62.5oC for half an hour. Cells of both isolates were grown to exponential phase at pH 5 or 7.4. Cells grown at 37oC at pH 5.0 were found tolerant to heat treatment as compared with cells grown at pH 7.4. Cells did not differ in their tolerance to heat at 55oC but at 60 and 62.5oC, cells of E. faecium BAR1 were found more heat tolerant than the cells of sE. faecalis MI2. The acidic pH of the growth medium had affected the susceptibility of E. faecium BAR1 and E. faecalis MI2 on heat tolerance. The cells grown at acidic pH showed greater heat tolerance that the cells grown at neutral pH.
  Kishwar Sultana , Tarriq M. Chaudhry , Shahid Mahboob and Asma Ashraf
  Bacterial enteritis induced by oral administration of 2 ml E.coli and Salmonella typhi suspension (109 organisms ml-1) showed negative effect on the growth rate of broiler chicks and 140 ml bacterial suspension was also mixed in drinking water. Bio-Mix (a herbal extract of A.B. Pharma) was used against bacterial enteritis, after 24 h @100 gm/50 kg feed for 7 days controlled the disease, i.e. loose dropping, less feed intake with reduced growth rate was found in diseased birds as compared to treated (Bio-Mix) and control. It was observed that the diseased birds showed loose dropping and less feed intake. The weekly weight gain record showed significantly (P<0.05) reduced growth rate as compared to healthy birds.
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