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Articles by Mohammad Ashraf
Total Records ( 6 ) for Mohammad Ashraf
  Mohammad Ashraf , Faiz-ul-Hassan and Mohammad Munir
  Changes in Na+, K+ and inorganic phosphate (Pi) have been quantified in the leachates during early hours of imbibition of untreated and 2, 6, 16 and 24 hours of water pre-treated wheat seeds at 16±1°C. During the course of 24 hours imbibition of untreated seeds, Na+ effluxed 1.2 ppm/seed. K+ concentration at zero hour observed was 2.27 ppm/seed which increased to 7.2±0.9 ppm/seed in leachates of 24 hours of imbibition of control seeds. Rate of K+ leakage from the seed was faster (4.54 ppm/seed/hour) during the initial 30 minutes which decreased to 0.3 ppm/seed/hour at 24 hours of imbibition. Pi leakage remained upto 8.1±1.2 ppm/seed during 24 hours of imbibition in control seeds. When seeds were pretreated in water for 2, 6, 16 and 24 hours, air-dried for a week to their original weights and allowed to re-imbibe for 1-3 days, decrease in ionic concentrations were noticed in their leachates with increase in duration to pre-treatment and least ionic concentrations were noticed in leachates of 24 hour pre-treated seeds. The significance of these changes during early hours of imbibition is discussed.
  Muhammad Khan Sarfraz , Nisar -ur-Rehman , Saeed Ahmed , Mohammad Ashraf and Sabeeh Mohsin
  The present study was conducted to develop sustained release matrix tablets of naproxen with the help of a hydrophobic polymer, Ethyl Cellulose (EC). Matrix tablets were prepared by incorporating various proportions of EC in the matrix system using wet granulation technique. The rate of drug release from the matrix tablets was found to be very slow and could not produce the desired release profiles in 12 h testing time. However, the tablets prepared by slightly modifying the wet granulation method exhibited comparatively linear and desirable release rate. No significant difference in the release profiles of naproxen matrix tablets was observed at different stirring speeds and storage conditions.
  Mohammad Ashraf , Faiz-ul-Hassan Nasim and Mohammad Munir Hussain
  Wheat seeds of two high vigour cultivars, Inqalab and Pasban, were heat-treated at 55±2 °C and 70±2 °C in presence (wet) or absence (dry) of water for 1 day. Germination tests exhibited reductions in percentage seed germination with increase in the pre-treated temperature and zero percent germination was exhibited in 55±2 °C (wet) treated seeds. `Pasban` seeds were more sensitive to heat-treatment than `Inqalab` seeds. Electrolytes leakage (μS/cm/seed) and rates of electrolytes leakage (μS/cm/seed/h) measured in the first 6 hours of imbibition reduced with increase in temperature treatment compared with that of controls. The correlation between loss in germinability and electrical conductance is discussed.
  Izzat Yasmin , Mohammad Ashraf and Faiz-ul-Hassan Nasim
  This work was conducted (i) to measure the electrical conductance of dry and imbibing seeds, (ii) to monitor the percentage germination and spread of germination of these species at varying temperature conditions and (iii) to find the optimal germination conditions so that some biochemical and biomolecular studies could be carried out in near future. Seeds of different plant species of Cholistan desert such as Capparis decidua, Salvadora oleiodes and Prosopis cineraria were allowed to germinate at various temperature regimes and their percent age germination was monitored. Results show that optimal germination temperatures for C. decidua is 20°C (90% germination in 8 days) and for P. cineraria (65% in 10 days) and S. oleiodes (85% in 4 days) is 30°C. Imbibition of P. cineraria in sand at 25°C has been effective to get 80 percent seeds germinated. Electrical conductance (μS/cm/10 seeds) measured during early hours/days of imbibition has been correlated with the increase in fresh weights of imbibing seeds, though there is decrease in the rate of electrolytes leakage (μS/cm/hour/10 seeds) with increase in imbibitional time. Work is in progress on the biochemical aspects of these early hours/days of seed germination.
  Samia Rashid , Mohammad Ashraf , Rubeen Anjum and Shahida Bibi
  Extracts of Launaea nudicaulis and L. resedifolia were subjected to the demonstration of insecticidal and cytotoxic activities by standard methods; the former was measured against red flour beetle and Sabz Tela and the later by brine-shrimp assay. Methanolic extracts of L. nudicaulis and L. resedifolia at concentration of 0.786 mg/cm2 exhibited 27.5±5 and 45±11 percent insecticidal activity against red flour beetle. L. nudicaulis was also insecticidal against Sabz Tela of cotton plant upto 100% activity. When the cytotoxicity was measured, alcoholic as well as aqueous extracts of both these plants killed larvae at 1mg/ml concentration upto 60-100 percent.
  Qamar-ul-Hassan Siddiqui and Mohammad Ashraf
  The results on mean percent pupal recovery of Bactrocera zonata at different depths as influenced by moisture levels indicated that the depth of pupation was significantly affected by moisture percentage in pupation substrate. The 10-15% moisture level of the pupation substrate was useful in holding the pupae. The mean percent adult emergence of B. zonata pupated at different depths of sand with variable moisture levels showed that both moisture levels and depths affected the adult emergence of this fruit fly. The adult emergence was synchronous with the pupation at different depths in sand having respective moisture level. The pupal recovery and adult emergence indicated that 10 and 15% moisture levels were the best suited for optimal pupation and adult emergence of B. zonata.
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