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Search Results: 1 - 10 of 188 matches for " Sakeena Qadir "
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Evaluation of antimicrobial activity of a lectin isolated and purified from Indigofera heterantha  [PDF]
Sakeena Qadir, Ishfak Hussain Wani, Shaista Rafiq, Showkat Ahmad Ganie, Akbar Masood, Rabia Hamid
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.411133
Abstract:

Indigofera heterantha commonly called indigo bush is a member of leguminoseae family found in the Himalayan region of Kashmir. A lectin has been isolated from the seeds of Indigofera heterantha by the purification procedure involving anion exchange chromatography on DEAE-cellulose followed by gel filtration chromatography on Sephadex G 100. Molecular characterization of the lectin was done by gel filtration and SDS-PAGE. Activity of the lectin was checked by hemagglutination assay and the sugar specificity by sugar inhibition tests. The antimicrobial activity of the purified lectin was carried out by Agar disc diffusion using appropriate standards. On the ion exchange column, the bound protein when eluted with 0-0.5 M NaCl gradient emerged as three peaks—peak I, peak II and peak III out of which only peak II showed the hemagglutinating activity. The lectin further resolved into two peaks G1 and G2 on gel filtration, with the lectin activity residing in G1, corresponding to a molecular weight of 70 KDa. The purified lectin named as Indigofera heterantha Lectin (IHL) produced a single band on SDS PAGE (18 KDa), revealing the tetrameric nature of the lectin. It agglutinated human erythrocytes (A, B, AB, and O). Hemagglutination was inhibited by D-galactose, Dmannose and D-arabinose. The lectin is reasonably thermostable showing full activity within a temperature range of 30°C to 90°C. pH stability of the lectin falls in the range of 2-9. IHL demonstrated a remarkable antibacterial activity against the pathogenic bacteria Klebsiella pneumoniae, Staphylococcus aureus, Escherichia coli, and Bacillus subtilis. IHL also inhibited the growth

Reclamation of Lithium Cobalt Oxide from Waste Lithium Ion Batteries to Be Used as Recycled Active Cathode Materials  [PDF]
Rakibul Qadir, Fahmida Gulshan
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.91010
Abstract: Waste laptop batteries (Type-Lithium ion) have been collected and manually dismantled in the current work. Active electrode materials were scraped off from the copper current collector and polyethylene separators. The aluminum current collectors were found to be severely damaged and attached with the electrode material. It was treated with NaOH later to be recovered as Al2O3. The leaching of LiCoO2 was done by 3 M HCl aided by 5% H2O2 at 60°C from the scraped active electrode materials (LiCoO2 and graphite) leaving the graphite completely. Co was precipitated as hydroxide by the addition of NaOH and later converted to Co3O4. The remaining solution was treated with saturated Na2CO3 to acquire Li2CO3 as crystalline precipitate with high purity. The recovery of Co and Li was 99% and 30%, respectively. Co3O4 and Li2CO3were mixed in stoichiometric proportions and calcined around 950°C with air supply to achieve LiCoO2 successfully.
脉冲星的能量损失和年龄估计
A.,Qadir
科学通报 , 1983,
Abstract: 自从六十年代发现脉冲星以来,在解释这种天体的理论模型方面,已取得大量的进展,Gold所提出的转动中子星模型已被广泛地接受,现在已很少有人怀疑脉冲星是一种中子星了。然而,在现行的中子星模型中有一些并未很好地确立的方面,也被普遍地接受。例如,一般认为,脉冲星的辐射可以用多极展开来描写,由此得到两个结果:1.如果中子星的辐射是纯偶极的,则其制动指数n=ω/必等于3;2.脉冲星年龄可以由其频率变化方程积分而求
Geometric Linearization of Ordinary Differential Equations
Asghar Qadir
Symmetry, Integrability and Geometry : Methods and Applications , 2007,
Abstract: The linearizability of differential equations was first considered by Lie for scalar second order semi-linear ordinary differential equations. Since then there has been considerable work done on the algebraic classification of linearizable equations and even on systems of equations. However, little has been done in the way of providing explicit criteria to determine their linearizability. Using the connection between isometries and symmetries of the system of geodesic equations criteria were established for second order quadratically and cubically semi-linear equations and for systems of equations. The connection was proved for maximally symmetric spaces and a conjecture was put forward for other cases. Here the criteria are briefly reviewed and the conjecture is proved.
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.
EMPOWERMENT OF WOMEN THROUGH DISTANCE EDUCATION IN PAKISTAN
Qadir BUKHSH
The Turkish Online Journal of Distance Education , 2007,
Abstract: The present study was undertaken to highlight the gender disparities of Pakistan as well as at regional and international level. The study, measured the comparative outcome of formal and non-formal system of education in Pakistan. To achieve the desired goal, documentary analysis was considered appropriate. The number of schools and enrollment during the years 2001 to 2004 of the formal system for primary, middle and high level was considered and enrollment during the year 198-1999 and 2004 for Secondary School Certificate to Ph.D level of non-formal system was considered. Data was analyzed in term of percentage and average. It was found that enrollment of female is less than male in formal system while enrollment of female is higher than male in non-formal system of education in Pakistan.
CELLULAR AUTOMATA BASED IDENTIFICATION AND REMOVAL OF IMPULSIVE NOISE FROM CORRUPTED IMAGES
Fasel Qadir
Journal of Global Research in Computer Science , 2012,
Abstract: Cellular Automata (CA) is a methodology that uses discrete space to represent the state of each element of a domain and this state can be changed according to a transition rule. Image noise is unwanted information of an image. Noise can occur during image capture, transmission or processing and it may depend or may not depend on image content. Noise reduction is one of the important processes in the pre-processing of digital images. Most primitive approaches used neighbour pixel values to replacement of noisy pixels. But these methods have a big disadvantage that they are applied on all the pixels, corrupted as well as un-corrupted pixels. So the images loosed vital texture such as edges. Recently researchers have been proposed classification based methods, in this case first identify the corrupted pixel and then replace it by the neighbour values whereas uncorrupted pixels remain unchanged. The proposed method first identifies the noise and then removes it from the corrupted image based on CA. To illustrate the proposed method, some experiments have been performed on several standard test images and compared with popular methods of filtering. The results show that the proposed method relatively has the desirable performance visibly as well as. First the concept of CA is introduced, and then accordingly to the structure of the neighbors, proposed model and then the experimental results. Keywords- Cellular automata, Image Processing, Noise Filtering.
Linearization: Geometric, Complex, and Conditional
Asghar Qadir
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/303960
Abstract: Lie symmetry analysis provides a systematic method of obtaining exact solutions of nonlinear (systems of) differential equations, whether partial or ordinary. Of special interest is the procedure that Lie developed to transform scalar nonlinear second-order ordinary differential equations to linear form. Not much work was done in this direction to start with, but recently there have been various developments. Here, first the original work of Lie (and the early developments on it), and then more recent developments based on geometry and complex analysis, apart from Lie’s own method of algebra (namely, Lie group theory), are reviewed. It is relevant to mention that much of the work is not linearization but uses the base of linearization. 1. Introduction Symmetry has not only been one of the criteria of aesthetics and beauty but has repeatedly proved extremely useful. It lies at the base of the geometry of the Greeks and is at the base of modern developments in high energy physics and in gravity. It was used by Evariste Galois in 1830 [1] for proving that quartic equations are solvable by means of radicals but that it is impossible to canonically solve higher order polynomial equations by means of radicals. This led to the concept of groups. The groups used are now called Galois groups. Lie wanted to extend the approach of Galois to deal with differential equations (DEs). Of course, this is a vastly more ambitious programme. Apart from the order of the DEs there are ordinary DEs (ODEs) and partial DEs (PDEs); scalar DEs and vector DEs; initial and boundary conditions to be satisfied. Worse follows; while polynomial equations generically have at most as many solutions as their order, DEs have infinitely many. For ODEs the infinity is tamed because there are arbitrary parameters (constants) that appear, and they are as many as the order of the ODEs. However, they remain untamed for PDEs. To extend the use of symmetry to differential equations, Lie (1880/83/91) had to extend from finite groups to continuously infinite groups that could be (at least twice) differentiated [2–5]. These are now called Lie groups. One method Lie adopted was a generalization of the methods for some specific first-order ODEs, changing them to linear form by using an invertible transformation of the dependent and independent variables. He showed that all order ODEs can be transformed to linear form by such transformations. He then obtained general criteria for such transformations to exist for second-order ODEs. Such transformations are called point transformations, and the
Gravitational Wave Sources May Be "Further" Than We Think
Asghar Qadir
Physics , 2009,
Abstract: It has been argued that the energy content in time varying spacetimes can be obtained by using the approximate Lie symmetries of the geodesics equations in that spacetime. When applied to cylindrical gravitational waves, it gives a self-damping of the waves. According to this proposal the energy of the waves go to zero asymptotically as the radial distance to the two-thirds power. If true, this would mean that the estimates for the sensitivity of the detectors for the various sources would have to be revised
Geometric Linearization of Ordinary Differential Equations
Asghar Qadir
Mathematics , 2007, DOI: 10.3842/SIGMA.2007.103
Abstract: The linearizability of differential equations was first considered by Lie for scalar second order semi-linear ordinary differential equations. Since then there has been considerable work done on the algebraic classification of linearizable equations and even on systems of equations. However, little has been done in the way of providing explicit criteria to determine their linearizability. Using the connection between isometries and symmetries of the system of geodesic equations criteria were established for second order quadratically and cubically semi-linear equations and for systems of equations. The connection was proved for maximally symmetric spaces and a conjecture was put forward for other cases. Here the criteria are briefly reviewed and the conjecture is proved.
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