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Search Results: 1 - 10 of 198246 matches for " N. Altaf "
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Ionic gelation controlled drug delivery systems for gastric-mucoadhesive microcapsules of captopril
Altaf M,Sreedharan,Charyulu N
Indian Journal of Pharmaceutical Sciences , 2008,
Abstract: A new oral drug delivery system was developed utilizing both the concepts of controlled release and mucoadhesiveness, in order to obtain a unique drug delivery system which could remain in stomach and control the drug release for longer period of time. Captopril microcapsules were prepared with a coat consisting of alginate and a mucoadhesive polymer such as hydroxy propyl methyl cellulose, carbopol 934p, chitosan and cellulose acetate phthalate using emulsification ionic gelation process. The resulting microcapsules were discrete, large, spherical and free flowing. Microencapsulation efficiency was 41.7-89.7% and high percentage efficiency was observed with (9:1) alginate-chitosan microcapsules. All alginate-carbopol 934p microcapsules exhibited good mucoadhesive property in the in vitro wash off test. Drug release pattern for all formulation in 0.1 N HCl (pH 1.2) was diffusion controlled, gradually over 8 h and followed zero order kinetics.
Influence of Microsperma Lentil Genotypes on Tissue Culture Responses
N. Altaf,J. Iqbal,M. S. Ahmad
Pakistan Journal of Biological Sciences , 1998,
Abstract: In vitro growth responses of various lentil genotypes varied. The best callussing response was noticed in variety ILL- 4605. The genotype AARI-L-89503 had a tendency for embryogenesis. The genotype AARI-L-86642 had the best rooting ability. This genotype also showed in vitro flowering response. Masoor-85 and Pant-L-406 had moderate morphogenic responses. Meristem multiplication, shoot development, shoot bud formation from callus and adventitious rooting from shoot cuttings was obtained under appropriate growth regulators combinations.
Influence of Explant Source and Medium Ingredients on Culture Responses of Microsperma Lentil Cultivar Masoor-85
N. Altaf,J. Iqbal,M. S. Ahmad
Pakistan Journal of Biological Sciences , 1998,
Abstract: Culture responses of 9 lentil explants were compared in various media having different ingredients. The most promising were the scrapped axillary portions of basal nodes for enhanced regeneration. The optimum size of the explant was also determined. The callogenesis response varied with the explant and ranged between 0.3 - 0.5 cm. Among the sugars tested, sucrose was the best for callussing. Auxin 2,4-D induced callussing but cytokinin enhanced formation of shoot primordia in explants. Both BA and K promoted multiple shoot formation but K and GA gave more shoot buds. Cytokinins with auxins gave callussing. Callus was also induced in explants when grown in K (10 mg/l) + GA (1mg/l) containing medium in the dark. When callus was shifted to light it started regeneration as green dots. The addition of seed extract to K and GA medium considerably enhanced regenerations.
Recurrent Support and Relevance Vector Machines Based Model with Application to Forecasting Volatility of Financial Returns  [PDF]
Altaf Hossain, Mohammed Nasser
Journal of Intelligent Learning Systems and Applications (JILSA) , 2011, DOI: 10.4236/jilsa.2011.34026
Abstract: In the recent years, the use of GARCH type (especially, ARMA-GARCH) models and computational-intelligence-based techniques—Support Vector Machine (SVM) and Relevance Vector Machine (RVM) have been successfully used for financial forecasting. This paper deals with the application of ARMA-GARCH, recurrent SVM (RSVM) and recurrent RVM (RRVM) in volatility forecasting. Based on RSVM and RRVM, two GARCH methods are used and are compared with parametric GARCHs (Pure and ARMA-GARCH) in terms of their ability to forecast multi-periodically. These models are evaluated on four performance metrics: MSE, MAE, DS, and linear regression R squared. The real data in this study uses two Asian stock market composite indices of BSE SENSEX and NIKKEI225. This paper also examines the effects of outliers on modeling and forecasting volatility. Our experiment shows that both the RSVM and RRVM perform almost equally, but better than the GARCH type models in forecasting. The ARMA-GARCH model is superior to the pure GARCH and only the RRVM with RSVM hold the robustness properties in forecasting.
Physical Properties of Lithium Containing Cadmium Phosphate Glasses  [PDF]
Muhammad Altaf, M. Ashraf Chaudhry
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.14030
Abstract: Lithium cadmium phosphate glasses were prepared by melt quench technique. These glasses contain a mole % composition of x% Li2O-(50-x)% CdO-50%P2O5. The quantity x varies from 0-40 mole%. The physical properties reported in this paper are mass density ρ, modulus of rigidity η, coefficient of linear expansion α, transition temperature Tg, Softening temperature Ts, Oxygen packing density, Molar volume and lithium ion concentration. The mass density, oxygen packing density, modulus rigidity, transition temperature and softening temperature show decreasing trend with increasing concentration of lithium ions in these glasses, where molar volume and coefficient of linear expansion increases with increasing concentration of Li2O.
Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

Botrytis cinerea Growth on Kiwifruit of Different Harvest Maturity
Altaf Qadir
Pakistan Journal of Biological Sciences , 1999,
Abstract: The hyphal growth of Botrytis cinerea, was approximately the same on kiwifruit stored at 0, 5 or 10 C. Maximum growth rate was recorded at 20 C, this growth rate declined slightly at 25 C. On malt agar (MA) the growth rate at 0 C was the same as in kiwifruit stored at the same temperature. This growth rate was proportional with the increase in temperature from 5 to 20 C, but it declined slightly at 25 C. The hyphal growth rate was faster on MA than on kiwifruit. This faster growth rate on MA may be due to readily availability of substrate. While in fruit, the physical barriers and/ or possible invoking of defense mechanism may have reduced the growth rate of fungus.
The Professional Medical Journal , 2006,
Abstract: Objectives: The study was conducted to compare intravaginal misoprostolwith extra amniotic prostaglandin F2 alpha (PGF2") for labour induction in therapeutic abortions from 10-28 weeksgestation. Design: A prospective study experimental. Setting At Military Hospital, Rawalpindi. Period: FromMarch–December 2002. Materials & Methods: 68 patients with indications for therapeutic termination. Groups wereassigned through non-probability convenient sampling procedure. In one group 200:g of misoprostol in the form ofTab Arthrotec 50 was administered every two hours up to three doses. Other group of patients had received extraamnioticPGF2" solution. Main outcome measures were induction-abortion interval, cost-effectiveness and thefrequency of side effects. Induction was considered successful where abortion was achieved within 24 hours. Results:The average induction-abortion interval in the misoprostol group was 16.09±9.38hours.Successful abortions wereachieved in 79.41 percent(27/34).Total failures were seven of 34 cases. In the PGF2" group, all women aborted within20.24±11.57 hours, 76.47 percent (26/34) of which aborted within 24 hours. Conclusion: The acceptable expulsiontime, clinically insignificant side effects and the abortion rate obtained, showed that misoprostol by vaginaladministration may be an alternative method for interrupting gestation of 10-28 weeks.
Altaf Hussain
The Professional Medical Journal , 1999,
Abstract: This study comprised of 100 patients of suspected appendicitis who underwent appendectomies. The diseaseaffected young adults more often males than females with male to female ratio 1.3:1. Higher number ofpatients came in hot season and belonged o middle socio-economic class. There were 14% negativeexplorations; the rate was almost double 20% in females as compared to male 9%.
Altaf Hussain
The Professional Medical Journal , 2000,
Abstract: A study of 100 consecutive cases of appendectomy is presented. Eighty three percent of them were operatedin emergency. Twenty six percent presented within 48 hours after the onset of symptoms, 46% reported late(after 2 days) and 28% came very late (after 3 days). Complication rate in the last group was highest (64%)and minimum (9%) in the first group. Histopathology revealed non-obstructive acute appendicitis (66%),normal appendices (14%), gangrenous appendicitis (10%), perforated appendix with peritonitis (9%) andtuberculosis in 1%. Twenty five percent had wound infection, 2% had intra abdominal abscess, one hadwound dehiscence and one patient had fecal fistula. There was no mortality in these cases.
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