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Articles by Seema Iqbal
Total Records ( 2 ) for Seema Iqbal
  Fatima Bi , Muhammad Arman , Mahmood-ul-Hassan and Seema Iqbal
  Physical and chemical analysis of the polysaccharides isolated from Hypnea musciformis (red algae) of Karachi coast showed the characteristics of k-carrageenan. The observed yield for the isolated carrageenan was about 36%. Optical rotation and sulphated ash contents were found as [α]D = 52o and 16.20%, respectively. FTIR spectra showed a characteristic band at 930 cmG1 represents the anhydrogalactose where as the band at 840 cmG1 represent the galactose-4-sulphate. Viscosity measurements revealed a linear relationship with increase in concentration and decreased with the rise in temperature of aqueous solution of carrageenan. Thermodynamic parameters such as activation energy, latent heat of vaporization, free energy change of activation and entropy change of activation was evaluated by the change in viscosity data as a function of temperature and concentration. The free energy change of activation (ΔSη) increased regularly as the concentration of aqueous carrageenan solution and temperature of the system increased. Higher values of free energy change of activation, showed the higher association of carrageenan with water at particular temperature. The values of entropy change of activation (ΔSη) of viscous flow also increased with the increase in concentration and temperature of carrageenan solution. The high negative values of entropy change of activation (ΔSη) showed that the solution of carrageenan was more ordered in initial state than the activated one.
  Bi. Fatima , Syed Asghar Ali , Seema Iqbal , Muhammad Arman and Mahmood-ul-Hassan
  The effect of newly developed fertilizer named Fertilizer fritz (composed of Fe, Cu, Mn, Zn and B) on the growth responses, yield and uptake of micronutrients in the three medicinal plants Coriandrum sativum (Coriander), Nigella sativa (Kalonji) and Ptychotis ajowan (ajwain desi) were studied. Experiments were conducted in the fields of PCSIR Laboratories Complex, Karachi during October 1999 to May 2000 in randomized complete block design with three replications. The analysis of the data revealed that the formulation had a significant effect on plant height, length of leaves, yields of total plant, seeds, roots and stem. Maximum plant height was recorded in C. sativum (80%). Increases in the yield of plant material were about 45-95% in C. sativum, 25-60% in N. sativa and 5-40% in P. ajowan. Increases in the oil contents were 11.0, 8.80 and 7.60% for C. sativum, N. sativa and P. ajowan, respectively over control. In general plant responses towards the new formulation were in the order C. sativum>N. sativa>P. ajowan.
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