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Search Results: 1 - 10 of 461972 matches for " A Shaukat "
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A Study of Supersaturation Spectra of Deposition Ice Nuclei

K Hussain,A Shaukat,

大气科学进展 , 1989,
Abstract: Ice nuclei-supersaturation spectra in the form of a Power Law ( Ni=RSir; B and y are empirical constants) have been expressed since 1973 when the curve was first introduced independentally by Gagin and Huffman. Experiments performed with a thermal gradient diffusion chamber in order to investigate the validity of the power curve. The results show that a linear curve fit to the data is as good as the power curve. The linear curve has the coefficients of correlation between 0.75 and 0.93 whereas the power curve fit to the same data has the coefficients between 0.82 and 0.93. The data reported by other workers, Zamurs and Jiusto and Zamurs et al., exhibit the same trend.
Tractors, Mass and Weyl Invariance
A. R. Gover,A. Shaukat,A. Waldron
Mathematics , 2008, DOI: 10.1016/j.nuclphysb.2008.11.026
Abstract: Deser and Nepomechie established a relationship between masslessness and rigid conformal invariance by coupling to a background metric and demanding local Weyl invariance, a method which applies neither to massive theories nor theories which rely upon gauge invariances for masslessness. We extend this method to describe massive and gauge invariant theories using Weyl invariance. The key idea is to introduce a new scalar field which is constant when evaluated at the scale corresponding to the metric of physical interest. This technique relies on being able to efficiently construct Weyl invariant theories. This is achieved using tractor calculus--a mathematical machinery designed for the study of conformal geometry. From a physics standpoint, this amounts to arranging fields in multiplets with respect to the conformal group but with novel Weyl transformation laws. Our approach gives a mechanism for generating masses from Weyl weights. Breitenlohner--Freedman stability bounds for Anti de Sitter theories arise naturally as do direct derivations of the novel Weyl invariant theories given by Deser and Nepomechie. In constant curvature spaces, partially massless theories--which rely on the interplay between mass and gauge invariance--are also generated by our method. Another simple consequence is conformal invariance of the maximal depth partially massless theories. Detailed examples for spins s<=2 are given including tractor and component actions, on-shell and off-shell approaches and gauge invariances. For all spins s>=2 we give tractor equations of motion unifying massive, massless, and partially massless theories.
Quantification of active and total transforming growth factor-β levels in serum and solid organ tissues by bioassay
Shaukat A Khan, Jennifer Joyce, Takeshi Tsuda
BMC Research Notes , 2012, DOI: 10.1186/1756-0500-5-636
Abstract: Mink lung epithelial cells were stably transfected with plasminogen activator inhibitor-1 promoter/luciferase construct, in which bioactive TGF-β level was represented by luciferase activity. Serum total TGF-β levels were comparable between the bioassay and enzyme-linked immunosorbent assay (ELISA), but active TGF-β levels measured by ELISA were significantly lower than those obtained by the bioassay. Active and total TGF-β levels in the solid organs including heart, liver, and kidney were also measured. Total TGF-β levels were relatively comparable among these organs, but active TGF-β levels were slightly higher in hearts and kidneys than in livers. Positive luciferase activities in the bioassay were almost completely inhibited by adding pan-TGF-β neutralizing antibodies, suggesting its high specificity to bioactive TGF-β. We also measured myocardial TGF-β levels after myocardial infarction and sham control by the bioassay, and compared the values with those obtained by ELISA. The bioassay demonstrated that both active and total tissue TGF-β levels were significantly higher in post-myocardial infarction than in sham myocardium. ELISA was markedly less sensitive in detecting both active and total TGF-β levels than our bioassay and failed to show any statistically significant difference in TGF-β levels between myocardial infarction and sham myocardium.Our data suggested that the bioassay was significantly more sensitive than ELISA in detecting active TGF-β in serum and both active and total TGF-β in solid organ tissues. The bioassay will be useful in investigating TGF-β profile in various solid organs in physiological and pathological conditions.The transforming growth factor-β (TGF-β) superfamily consists of more than 40 members including TGF-β, activins, inhibins, growth differentiation factors, and bone morphogenetic proteins. They regulate a variety of physiological processes, including embryonic development, cell proliferation, differentiation, migration, adhesi
Genotoxic Effects of Captan Fungicide on Root Meristems of Allium cepa L. In vivo
Rufus. S. A. Gill,S. Shahid Shaukat
Pakistan Journal of Biological Sciences , 2000,
Abstract: The Fungicide Captan was screened in Allium cepa multiple assay test for mutagenic activity. Actively dividing root tips were treated with four different concectrations 5,10, 20, 40 ppm of the fungicide for 1, 3, 6, 12 and 24 hours. Almost all trearments exerted a mitodepressive action indicating that the fungicide has an immediate effect on cell division . It was noted that the fungicide exerts a clastogenic effect on chromosomes. Mitotic aberrations observed included stickiness of chromosomes at prophase, metaphase, bridging at anaphase and bi and tri nucleated cells. Such aberrations are important as they may have evolutionary significance
Zinc Improves Biocontrol of Meloidogyne javanica by the Antagonistic Rhizobia
S. Shahid Shaukat,Imran A. Siddiqui
Pakistan Journal of Biological Sciences , 2003,
Abstract: Mineral amendments influence the performance of antagonistic microorganism to suppress soil-borne fungal and nematode diseases. Experiments were conducted to evaluate the influence of zinc on the production of nematicidal compound(s) in vitro and root-knot infection by Meloidogyne javanica in tomato. Nutrient rich medium amended with various concentrations (0.25-2.0 mM) markedly improved the nematicidal activity of rhizobia in vitro. Species and even strain-specific differences were observed among bacteria with respect to their response to different zinc concentrations. Efficacy of the 10 different isolates (66.6% of the total isolates) was maximum when growth medium was amended with zinc at 1.5 mM while 4 isolates (26.6% of the total isolates) exhibited optimal performance when exposed to 2.0 mM zinc. In vitro nematicidal activity of only one strain was optimal at 1.0 mM zinc. Soil amendment with zinc in the form of ZnSO4 at 0.9 mg/kg of soil alone or in conjunction with rhizobia caused significant inhibition of root-knot development and enhanced the growth of tomato plants under glasshouse conditions.
Assessment of Extent and Severity of Pellet Induced Abdominal Injuries, a Rare Variant of Weapon Violence: A Prospective Study  [PDF]
Azher Mushtaq, Atif Naeem Raja, Hilal Ahmad Wani, Shaukat A. Jeelani, Nazia Hilal, Ishfaq Ahmed Gilkar
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.710064
Abstract: Background: The use of a Pellet gun, a form of short gun used for mob control in many conflict zones, has posed a serious challenge to the surgeons in assessing the extent of trauma caused by these pellets. Objectives: To study the role of conventional available investigations for trauma like ultrasonography and computed tomography scans in assessing the severity of the injuries caused by the pellets. Methodology: 50 patients having pellet injuries predominantly in abdomen without other associated trauma were included in the study. The decision for surgery was taken on the basis of clinical and CECT (Contrast Enhanced Computed Tomography) findings and these findings were then compared with intra-operative findings. Results: 30/50 patients were decided to be operated on the basis of Clinical and CECT findings. On exploration, it was observed that 18/33 patients really needed exploration while as 15/33 patients could have been managed conservatively. This was observed in next 20/50 patients who were put on conservative management with similar CECT findings. Of these 20 patients, 17 did well while as 3 were explored later in view of developing peritonitis and were found to have small bowel perforations. Conclusion: Conventional investigations for trauma like FAST and CECT abdomen are not ideal for assessing the severity of pellet induced abdominal visceral injuries which result in high rate of unnecessary laparotomies. Also the abdominal pellet trauma patients can be well managed conservatively until hemodynamically stable even though CT scan shows pellet penetration into peritoneal cavity or bowel lumen.
The Professional Medical Journal , 2010,
Abstract: Objectives: To analyze the rate of Pneumothorax after CT guided TNAB of lung masses , and correlating it with the size of thelesion. Design: Descriptive study. Setting: Department of Radiology Mayo Hospital, Lahore. Period: From June 2002 to April 2003, Patientsand method: Seventy patients underwent CT guided FNA of the chest masses. Results: Out of Seventy, 18 patients i.e.; 26 % developedPneumothorax. Lesion less than 1 cm , out of 6 patients 3 developed pneumothorax ( 50 %), lesions 1-2 cm 5 out of 11 developedpneumothorax(45%), lesions with size of 2-3 cm 5 out of 14 patients developed pneumothorax ( 35%), lesions between 3-4 cm 2 out of 8developed pneumothorax (25%), lesion sized 4-5 cm 1 out of 15 developed pneumothorax (6%), and lesion with more than 5 cm size 1 out of 16 developed pneumothorax ( 6%) . Conclusion: The study shows that the rate of Pneumothorax after CT guided TNAB of Lung Massesincreases as the size of the lesion decreases.
The Professional Medical Journal , 2010,
Abstract: Objective: To know the findings of MDCT in cases of Abdominal Tuberculosis. Patients and Methods: Fifty eight patients withsuspicion of abdominal tuberculosis were scanned and the findings were evaluated. All the patients received IV and oral contrast. The patients were referred from the medical and surgical departments of Shalamar Hospital, Lahore. Toshiba 4 Slice Aquilion was used for scanning. The exclusion criterion was patients on Anti tuberculous drugs and urogenital tuberculosis. Results Following 6 findings were observed in 47 abnormal scans, Out of other 11 scans 9 had other diseases like diverticulitis, Appendicitis and Bowel Lymphoma. 2 were normal. Close medical and Surgical follow up was obtained in all cases. Ascites = 35, Omental / Mesenteric Thickening / Involving = 27, Small Bowel wall thickening = 07, Large bowel wall thickening including Caecal wall thickening = 06, Abdominal Lymphadenopathy= 26, Solid Organ Involvement, Liver=01, Spleen=02. Conclusion: Ascites was the most common finding in Patients with Abdominal Tuberculosis and Involvement of liver being the least common finding amongst the group.
A Study of Suspended Participate Matter in Lahore (Pakistan)

K Hussain,Ruby Riffat,A Shaukat,M Ashraf Siddiqui,

大气科学进展 , 1990,
Abstract: The results obtained from an investigation of suspended particulate matter in the metropolitan city of Lahore (Pakistan) are reported and analysed in this paper. X-ray diffraction studies of the airborne matter collected from va-rious urban and suburban sites show that non-clay minerals such as quartz, calcite and albite are contained in most of the samples in almost comparable amounts. Chemical analysis of some samples was carried out for complementing the x-ray diffraction data. The amount of quartz in the samples of dusty areas was found to be an order of magnitude more than in the samples of relatively cleaner areas. As the dust particles of these compounds are poor substrate for promoting nucleation of ice in the atmospheric clouds, they are liable to stay steadily in the atmosphere as pollutants.A comparison of the results of the airborne particulates and the soil samples collected from various sites show that the sources of quartz, calcite and albite in the airborne matter are both local and remote.
Allelopathic Potential of Anagallis arvensis L. : A Cosmopolitan Weed
Zenab Rebaz,S. Shahid Shaukat,Imran A. Siddiqui
Pakistan Journal of Biological Sciences , 2001,
Abstract: Effect of Anagallis arvensis L. on seed germination and early seedling growth of six test species was examined. Aqueous extract of A. arvensis inhibited germination, root and shoot growth of all the six test species. The species exhibited differential response to the extract. Germination was reduced by the shoot extract in the order: pearl millet > mustard > carrot > turnip > wheat = corn. Decaying A. arvensis in sandly-loam soil at 5, 10 and 20 g / kg soil substantially inhibited germination and seedling growth of pearl millet at all the dosages. Bioassay of the extract of A. arvensis revealed two zones of inhibition at Rf values 0.8-0.9 and 0.9-1.0. Chromatography for the phenolics revealed the presence of three phenolic acids: salicylic acid, cinnamic acid and caffeic acid.
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