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Search Results: 1 - 10 of 401363 matches for " M. Altaf "
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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
Abstract:

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.

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.
Ultrastructural Changes in the Myelinated Nerve Fibers of the Sciatic Nerve in Galactose Intoxication in Rats
Faris M. Altaf
Pakistan Journal of Nutrition , 2012,
Abstract: The objectives were to study the ultrastructural changes in the myelinated nerve fibers in an animal model of galactosaemia. The study was done in the Anatomy Department, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia. Twenty-four adult male albino rats were used (6 control and 12 experimental animals). Galactosaemia was induced by adding 40% D-galactose to the rats' diet for 2 months. Sciatic nerves of the control and experimental animals were removed and processed for electron microscopic study. Four months following galactosaemia, the myelinated nerve fibers showed cytoplasmic vacuoles in Schwann cells, myelin degeneration, axonal retraction and destruction of the myelinated axons. 6 months after induction, some myelinated nerve fibers showed disruption of myelin sheaths with marked shrinkage of the axons. The endoneurial edema was prominent and some regenerating nerve fibers were reported. 8 months latter: the endoneurial and intra-axonal oedema accumulated more. Schwann cells showed cytoplasmic degenerated myelin, fat vacuoles and accumulation of fine glycogen granules in the axoplasm. It could be concluded that in galactose intoxication induced degenerative changes in the myelinated nerve fibers. It showed also decrease in diameters of the myelinated nerve fibers and axons.
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.
Post traumatic ischemic stroke in posterior and middle cerebral arteries following evacuation of extradural hematoma
Wani Abrar,Babu M,Altaf R,Altaf K
Journal of Pediatric Neurosciences , 2007,
Abstract:
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.
Some Aspects of Adventitious Rooting in Microsperma Lentil CV-Masoor-85
Nafees Altaf,Javed Iqbal,M. Salih Ahmad
Pakistan Journal of Biological Sciences , 1999,
Abstract: Presence of auxins and high humidity in the initial stages of growth in vitro of 10-15 days old shoot cuttings is very essential for adventitious rooting in microsperma lentil in cultivar Masoor-85. The type and quantity of auxins is important. The basal segments of stem have more chances of rooting which gradually decreases for apical segments. Also age of shoots in culture has influence on rooting. Rooting is with normal polarity. Boron ( 30 mg/l) and MS (1/10 strength) salts in diluted concentration helps root induction and development. Moist peat and filter paper bridge both support rooting.
Isolation, Characterization and Growth Response of Pesticides Degrading Bacteria
S. Jilani,M.Altaf Khan
Journal of Biological Sciences , 2004,
Abstract: In Pakistan, insecticides are widely used in agriculture. Despite their biodegradable nature, some are highly toxic and their residues are found in the environment. Moreover, its removal from wastewater generated during manufacture becomes inevitable. Reports on the mineralization of a spectrum of different insecticides by a single potential strain are scarce. In this study, a bacterial strain was isolated from soil using enrichment technique and identified as Pseudomonas sp. by microscopic examination and biochemical tests. Growth curve experiments showed that Pseudomonas strain was able to grow in nutrient medium containing malathion (35-220 mg L-1), methamidophos (80-320 mg L-1), cartap (60-120 mg L-1) and cypermethrin (40-125 mg L-1) pesticide. However, the optimum concentration which support normal bacterial growth during 24 h was found to be 120 mg L-1 malathion, 160 mg L-1 methamidophos, 80 mg L-1 cartap and 60 mg L-1cypermethrin. When compared with the control test, a significant increased in bacterial population was noted at low concentration of each pesticide, however at high concentration lag phase increased but no zone of inhibition observed. These data indicate that the isolated Pseudomonas strain can be used as a microorganism for the bioremediation of pesticide contaminated soil or water.
Spontaneous Perforation of Colon: A Case Report and Review of Literature  [PDF]
Ahmed M. Makki, Soha Hejazi, Nisar Haider Zaidi, Adel Johari, Abdulmalik Altaf
Case Reports in Clinical Medicine (CRCM) , 2014, DOI: 10.4236/crcm.2014.37087
Abstract:

Objective: To present a case of spontaneous perforation of colon. Introduction: Spontaneous perforation of colon (SPC) is defined as sudden perforation of apparently healthy colon in absence of diseases or injury. SPC is an uncommon clinical entity which is seldom reported in literature, less than 100 cases were reported. Case report: A 82-year-old gentleman presented to emergency room (ER) with acute abdominal pain, for few hours duration. Pain started paraumbilically with sudden onset and then with increasing intensity became generalized. It was associated with nausea and vomiting. On general examination, he was conscious, alert. His vital signs: afebrile, pulse: 106/m, B.P: 140/100, local examination showed generalized abdominal tenderness & guarding with absent intestinal sounds. P.R. exam showed remnants of stool with blood stain on gloves, no masses. Computerized tomography (CT) abdomen showed perforation of cecum. He was taken to operation room (OR) and right hemicolectomy was done. Post operative period was uneventful and he was discharged in good health. Conclusion: SPC is a serious condition with high morbidity and mortality due to delay in diagnosis and management so, every effort should be made to make diagnosis especially in elderly and prompt surgical intervention should be done.

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