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Articles by A. Khan
Total Records ( 7 ) for A. Khan
  A. Clarke , T. Prescott , A. Khan and A.G. Olabi
  Many authors have written in the past regarding the exact causes of breakage and disruption in a high-pressure homogeniser, but there has been little agreement. This paper investigates some of the most likely causes of the rupture of the walls of unicellular organisms and offers suggestions obtained from various papers and work carried out.
  M. Siddiq , A. Iezzoni , A. Khan , P. Breen , A.M. Sebolt , K.D. Dolan and R. Ravi
  Tart cherries (Prunus cerasus L.) are rich in anthocyanins and possess high antioxidant activity. The objective of this study was to evaluate six Michigan tart cherry selections for different quality attributes; fruit weight, firmness, total soluble solids (TSS), titratable acidity, instrumental color parameters, total anthocyanins, and antioxidant capacity, determined as Oxygen Radical Absorbance Capacity (ORAC). Generally, significant (p < 0.01) differences were observed across tart cherry selections for fruit weight, firmness, total soluble solids, titratable acidity, and color values. As compared to 13.7°B for Montmorency (control), the TSS contents of all the tart cherry selections were significantly higher; ranging from 15.8 °B in selection 27−10(50) to 20.2°B in Erdi Jubileum. Fruit weight also showed significant differences, which were in the range of 3.95-8.17 g|fruit. In comparison to Montmorency, other tart cherry selections showed significantly higher titratable acidity (1.20−1.41% vs. 1.132%); higher anthocyanins (78.9−391.4 μg/g vs. 33.1 μg/g, as gallic acid equivalent); and higher ORAC values (up to 145.4% more). With respect to cost and better marketability, the results of this study could be useful for the cherry juice|concentrate industry.
  F. Subhan , M. Khan , M. Ibrar , Nazar-ul- Islam , A. Khan and A.H. Gilani
  Hydro-ethanolic crude extract of Hypericum perforatum Linn. family hypericaceae (St. John`s Wort) aerial parts (Hp. Cr) was studied for its possible antinociceptive effect against acetic acid-induced abdominal constriction assay in mice. Hp. Cr (10-20 mg kg-1), opium (10-30 mg kg-1), morphine (0.75-3.0 mg kg-1) and aspirin (50-100 mg kg-1) showed dose-dependent antinociceptive effect. In animals treated with naloxone (0.5 mg kg-1), the antinociceptive effect of Hp. Cr was significantly reduced similar to that of opium, while effect of aspirin remained unchanged. These results suggest that the antinociceptive effect of Hypericum perforatum may be mediated through activation of opioid receptors.
  A. Khan , Y.I. Khattak and R. Khan
  The paper describes the possibility of extending the storage life of onions by gamma radiation, which poses a serious storage problem in the hot summer months in Pakistan. Bulbs were irradiated at a dose of 0.10 kGy and stored, alongwith unirradiated control, under ambient conditions for a period of 4 months. The weight loss varied between 15 and 23 after the storage period. It was found that losses through dehydration were less in the Desi than in the Red Variety. The rotting ranged from 6.5-9.4 percent in the irradiated onions and 12.4-12.8 percent in the unirradiated bulbs after 4 months storage. Quality evaluation tests revealed that the internal and external quality of the irradiated samples scored higher than the corresponding controls. The cost of onions irradiation was calculated to be Rs.290.00 per tonne.
  A. Khan , Y. I. Khattak and R. Khan
  Potatoes (Varieties: Cardinal and Patrones) were irradiated at a dose of 0.10 kGy in Co-60 Irradiator and stored at 20 °C for a period of 4 months. There was 5 and 3 per cent rotting in control and 9 and 5 per cent rotting in irradiated tubers in Cardinal and Patrones respectively at the end of 4 months storage period. The sprouting percentage at the end of 4 months was 51 and 59 in unirradiated tubers in Cardinal and Patrones varieties whereas no sprouting was observed in the irradiated potatoes in both the varieties. The weight loss was more (8.3 and 6.6 %) in the control than the irradiated tubers (6.7 and 5.7 %) in Cardinal and Patrones varieties at the end of 4 months storage period. Effect of radiation and storage was significant on ascorbic acid but negligible on sugars. Sensory quality was improved as a result of radiation treatment. The cost economics for food irradiation based on a source strength of 59 kCi was Rs. 290 per tonne.
  Waris Ali , M. Mushtaq , G. Muhammad , A. Khan , S. Arif , Y.N. Anjam and Saima Nazir
  In this paper, the direct boundary element method is being used to give solution for surface as well as ground water bodies which are major nutrition fluids. To calculate the pressure distribution over the boundary of a symmetric aerofoil for which the analytical solution is available to check the accuracy of the method, the computed flow pressure are compared with the analytical solution for the flow over the boundary of a symmetric aerofoil.
  M. Mushtaq , N.A. Shah , G. Muhammad , A. Khan , S. Arif and Y.N. Anjam
  In this paper, an indirect boundary element method is used to give solution for surface as well as ground water bodies which are major nutrition fluids. The inviscid compressible flow (i.e., velocity distribution) over the surface of the joukowski aerofoil has been calculated with linear element approach using doublet distribution alone whereas in our previous research papers, we applied constant boundary element approach for this purpose. To check the accuracy of the method, the computed flow velocity is compared with the exact velocity. The comparison of these results has been given in the tables and graphs. It is found that the computed results are in good agreement with the analytical results.
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