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Search Results: 1 - 10 of 16498 matches for " Faheem Ahmed Khan "
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Anti-Radical and Neuroprotective Potential of Ficus infectoria in Scopolamine Induced Memory Impairment in Mice  [PDF]
Kiran Zahid, Syed Muhammad Faheem Ahmad, Maqsood Ahmed, Farah Khan
Advances in Alzheimer's Disease (AAD) , 2018, DOI: 10.4236/aad.2018.72005
Abstract: Ficus infectoria has a wide distribution in Bangladesh, Nepal, Pakistan, Sri Lanka, Southwest China and Indochina and is an enrich source of phytochemicals thereby possess antibacterial, antifungal and hyperglycaemic activities. In this study, we attempted to examine the cognitive ability of methanolic and ethanolic extract of F. infectoria fruit extract in scopolamine induced memory impairment in mice by using preliminary phytochemical and antioxidant tests, and the cognitive ability of the methanolic and ethanolic fruit extract of F. infectoria. Fruit extract was analyzed in scopolamine amnesia mice using passive avoidance approach. Piracetam was used as a reference drug (200 mg/Kg). Further confirmation was provided by means of mice brain homogenate biochemical tests. Maximum phytochemical, antioxidant activity and nootropic ability were observed in the ethanolic fruit extract of F. infectoria. Plant extract was used at three doses i.e. 75 mg/Kg, 150 mg/Kg and 300 mg/Kg and exhibited nootropic abilities in all tests used. Enhanced SDL value i.e. (291.2 ± 0.33+++###) was observed by the administration of plant extract at all dose range in comparison to reference drug i.e. piracetam (252.8 ± 1.60###) used in the study. The plant extract utilization has showed increase in total protein (25.08 ± 0.26+++### mg/g of tissue) and reduced glutathione content (33.0 ± 0.46+++### nmoles/mg of protein) and vice versa while low malondialehyde (MDA) (9.18 ± 0.17+++### nmoles/mg of protein) and AChE activity (0.067 ± 0.009+++### M/min/g protein). However, opposite situation was observed in the scopolamine amnesia mice. Hence it was concluded the plant extract possessed neuroprotective activity in the scopolamine induced cognitive decline in mice thereby used as cost effective natural medicines in near future.
Response of Fodder Maize to Various Levels of Nitrogen and Phosphorus  [PDF]
Aziz Khan, Fazal Munsif, Kashif Akhtar, Muhammad Zahir Afridi, Zahoor  , Zahoor Ahmad, Shah Fahad, Rizwan Ullah, Faheem Ahmed Khan, Mairaj Din
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.515246
Abstract:

Nitrogen (N) and Phosphorus (P) are of the most important and complex nutrients for the crop plants in particular for grain yield and quality. The field trials were laid out in randomized complete block design having three replications. Research trial plots were located at Agricultural Research Farm of Agricultural University Peshawar (Ameer Mohammad Khan Campus Mardan) during kharif season in 2012 to investigate the response of maize variety (Jalal) to three phosphorus rates (60, 90 and 120 kg·ha-1) and four nitrogen rates (90, 120, 150, 180 kg·ha-1) for agronomical traits. These traits investigated included number of plant per m2 (NP m2), plant height (PH), number of leaves plant-1 (NLP), leaf area plant-1·cm2 (LAP), fresh weight of plants kg·ha-1 (FW) and dry weight of plant kg·ha-1 (DW), were investigated. Results of the study showed that application of N @ 180 and P @ 120 kg·ha-1 significantly increased fodder yield of maize. The linear increase in biomass yield clearly indicated that N was a limiting nutrient factor and that N demand along with P has a positive response. At higher application rates, N fertilizer significantly

An Experimental Study on Effects of Dibenzyl Disulfide and Copper Sulfide on Pressboard Insulation of Power Transformers
Faheem Ahmed Khan,J. Sundara Rajan,Mohd. Z. A. Ansari,Divya sivan
International Journal of Advanced Electrical and Electronics Engineering , 2012,
Abstract: Pressboard is a hard and rigid board having high with excellent electrical and mechanical properties, is specifically produced for the high voltage and extra high voltage Transformer Industry. Components and insulating sheets of pressboard are used in oil-cooled power transformers and distribution transformers primarily due to their high purity, mechanical strength and optimal oil-impregnability. The components formed of pressboard, such as angle rings, snout segments and end leads, enable an exact adaptation to the electric field conditions prevailing in the transformer. since the 1960’s the main insulation of power transformers has been built up as layered oil/board-insulation. The latter represents a hybrid system, consisting of oil filled gaps subdivided by pressboard barriers. Different new mineral oils have differing values of conductivity (about a factor of 10), whereas the conductivity of solid insulation hardly changes. In this paper, observations are made for break down strength of press board insulation of power transformers under different applied voltages
Software Requirements Engineer: An Empirical Study about Non-Technical Skills
Faheem Ahmed
Journal of Software , 2012, DOI: 10.4304/jsw.7.2.389-397
Abstract: Over a period of time software industry has seen a steady growth and the main reason for this growth is increase in the supply and demand of software. In software industry people are hired from different parts of the world having technical and non-technical skills. However, non-technical skills which are equally given importance while hiring a new employee are relatively given little attention by researchers from software engineering community. The main objective of this work is twofold; firstly we provide comprehensive empirical evidence about up to what extent software industry is considering different non-technical skills while hiring a new employee as software requirements engineer. Secondly, we also target to find out whether employers’ non-technical skills requirements, as advertised in job postings, in case of software requirements engineering profession are similar across different cultures. We used a dataset of 250 jobs descriptions from four different regions of the world in this study. The broader conclusion of this study shows that there is an explicit requirement of having communication skills in a software requirements engineer. While some other non-technical skills such as analytical and problem solving, interpersonal skills, ability to work independently, and team player have also been given some moderate consideration. Whereas, organizational skills, open and adaptable to changes, innovative, and fast learner skills are given least priority. On the regional side although Australian, Asian and European cultures exhibits more similarity than North American culture on the choice of non-technical skills requirements in hiring new employee in case of software requirements engineering profession but generally we concluded that cultural difference does not have a major impact on this decision.
Antibacterial and Cytotoxic Efficacy of Extracellular Silver Nanoparticles Biofabricated from Chromium Reducing Novel OS4 Strain of Stenotrophomonas maltophilia
Mohammad Oves, Mohammad Saghir Khan, Almas Zaidi, Arham S. Ahmed, Faheem Ahmed, Ejaz Ahmad, Asif Sherwani, Mohammad Owais, Ameer Azam
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0059140
Abstract: Biofabricated metal nanoparticles are generally biocompatible, inexpensive, and ecofriendly, therefore, are used preferably in industries, medical and material science research. Considering the importance of biofabricated materials, we isolated, characterized and identified a novel bacterial strain OS4 of Stenotrophomonas maltophilia (GenBank: JN247637.1). At neutral pH, this Gram negative bacterial strain significantly reduced hexavalent chromium, an important heavy metal contaminant found in the tannery effluents and minings. Subsequently, even at room temperature the supernatant of log phase grown culture of strain OS4 also reduced silver nitrate (AgNO3) to generate nanoparticles (AgNPs). These AgNPs were further characterized by UV–visible, Nanophox particle size analyzer, XRD, SEM and FTIR. As evident from the FTIR data, plausibly the protein components of supernatant caused the reduction of AgNO3. The cuboid and homogenous AgNPs showed a characteristic UV-visible peak at 428 nm with average size of ~93 nm. The XRD spectra exhibited the characteristic Bragg peaks of 111, 200, 220 and 311 facets of the face centred cubic symmetry of nanoparticles suggesting that these nanoparticles were crystalline in nature. From the nanoparticle release kinetics data, the rapid release of AgNPs was correlated with the particle size and increasing surface area of the nanoparticles. A highly significant antimicrobial activity against medically important bacteria by the biofabricated AgNPs was also revealed as decline in growth of Staphylococcus aureus (91%), Escherichia coli (69%) and Serratia marcescens (66%) substantially. Additionally, different cytotoxic assays showed no toxicity of AgNPs to liver function, RBCs, splenocytes and HeLa cells, hence these particles were safe to use. Therefore, this novel bacterial strain OS4 is likely to provide broad spectrum benefits for curing chromium polluted sites, for biofabrication of AgNPs and ultimately in the nanoparticle based drug formulation for the treatment of infectious diseases.
The Odd-Point Ternary Approximating Schemes  [PDF]
Ghulam Mustafa, Abdul Ghaffar, Faheem Khan
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.12011
Abstract: We present a general formula to generate the family of odd-point ternary approximating subdivision schemes with a shape parameter for describing curves. The influence of parameter to the limit curves and the sufficient conditions of the continuities from C0 to C5 of 3- and 5-point schemes are discussed. Our family of 3-point and 5-point ternary schemes has higher order of derivative continuity than the family of 3-point and 5-point schemes presented by [Jian-ao Lian, On a-ary subdivision for curve design: II. 3-point and 5-point interpolatory schemes, Applications and Applied Mathematics: An International Journal, 3(2), 2008, 176-187]. Moreover, a 3-point ternary cubic B-spline is special case of our family of 3-point ternary scheme. The visual quality of schemes with examples is also demonstrated.
A Unified Interpolating Subdivision Scheme for Curves/Surfaces by Using Newton Interpolating Polynomial  [PDF]
Faheem Khan, Irem Mukhtar, Noreen Batool
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.33033
Abstract:

This paper presents a general formula for (2m + 2)-point n-ary interpolating subdivision scheme for curves for any integer m 0 and n 2 by using Newton interpolating polynomial. As a consequence, the proposed work is extended for surface case, which is equivalent to the tensor product of above proposed curve case. These formulas merge several notorious curve/surface schemes. Furthermore, visual performance of the subdivision schemes is also presented.  

Construction and Application of Subdivision Surface Scheme Using Lagrange Interpolation Polynomial  [PDF]
Faheem Khan, Noreen Batool, Iram Mukhtar
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.53040
Abstract:

This paper offers a general formula for surface subdivision rules for quad meshes by using 2-D Lagrange interpolating polynomial [1]. We also see that the result obtained is equivalent to the tensor product of (2N + 4)-point n-ary interpolating curve scheme for N ≥ 0 and n ≥ 2. The simple interpolatory subdivision scheme for quadrilateral nets with arbitrary topology is presented by L. Kobbelt [2], which can be directly calculated from the proposed formula. Furthermore, some characteristics and applications of the proposed work are also discussed.

A New 4-Point Quaternary Approximating Subdivision Scheme
Ghulam Mustafa,Faheem Khan
Abstract and Applied Analysis , 2009, DOI: 10.1155/2009/301967
Abstract: A new 4-point 3 quaternary approximating subdivision scheme with one shape parameter is proposed and analyzed. Its smoothness and approximation order are higher but support is smaller in comparison with the existing binary and ternary 4-point subdivision schemes.
Analysis of the Binding Sites of Porcine Sialoadhesin Receptor with PRRSV
Yibo Jiang,Faheem Ahmed Khan,Nuruliarizki Shinta Pandupuspitasari,Ishwari Kadariya,Zhangrui Cheng,Yuwei Ren,Xing Chen,Ao Zhou,Liguo Yang,Dexin Kong,Shujun Zhang
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141223955
Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) can infect pigs and cause enormous economic losses to the pig industry worldwide. Porcine sialoadhesin (pSN) and CD163 have been identified as key viral receptors on porcine alveolar macrophages (PAM), a main target cell infected by PRRSV. In this study, the protein structures of amino acids 1–119 from the pSN and cSN (cattle sialoadhesin) N-termini (excluding the 19-amino acid signal peptide) were modeled via homology modeling based on mSN (mouse sialoadhesin) template structures using bioinformatics tools. Subsequently, pSN and cSN homology structures were superposed onto the mSN protein structure to predict the binding sites of pSN. As a validation experiment, the SN N-terminus (including the wild-type and site-directed-mutant-types of pSN and cSN) was cloned and expressed as a SN-GFP chimera protein. The binding activity between SN and PRRSV was confirmed by WB (Western blotting), FAR-WB (far Western blotting), ELISA (enzyme-linked immunosorbent assay) and immunofluorescence assay. We found that the S107 amino acid residue in the pSN N-terminal played a crucial role in forming a special cavity, as well as a hydrogen bond for enhancing PRRSV binding during PRRSV infection. S107 may be glycosylated during PRRSV infection and may also be involved in forming the cavity for binding PRRSV along with other sites, including W2, Y44, S45, R97, R105, W106 and V109. Additionally, S107 might also be important for pSN binding with PRRSV. However, the function of these binding sites must be confirmed by further studies.
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