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Search Results: 1 - 10 of 70 matches for " ABDELGADIR RAYIS SHADIA "
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BIOTROPIA : the Southeast Asian Journal of Tropical Biology , 2002,
Abstract: Mutagens cause random changes in the nuclear DNA or cytoplasmic organelles, resulting in gene, chromosomal or genomic mutations and hence, create variability. In this study, flow cytometry (FCM) was used to determine ploidy levels and DNA content in gamma-irradiated variants of mutated Pisang Berangan (cv. Intan, AAA) - a local banana genotype. Induced variants such as shor t plant stature (stunted growth), late flowering plants (late maturity) and abnormalities in bunch characters were selected to stud y possible changes at the DNA level. The study showed that DNA content of mutated plants differed from non-irradiated control and that irradiation had the most effect at high doses (40 and 60 Gy). The increase of DNA content in 20 Gy and 30 Gy treated plants was not more than that of the control plants. The values of genomic DNA content of gamma-irra diation variants decreased as the dose of irradiation increased from 20 to 60 Gy, indicating that the high dose of gamma-irradiation had a significant effect on the genome of the plants. The analysis further showed that phenotypic variation due to mutagenesis was reflected in the DNA content of the plants. The results also showed that ploidy levels were not affected by gamma-irradiation even at high doses.
Determination of Tea Saponin in Camellia Seed Oil with UV and HPLC Analysis  [PDF]
Hadeil Omer Abdelgadir Ahmed, Chengming Wang
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.34C004

A simple procedure is described for the HPLC and UV determination of tea saponin in tea seed oil. Determinate was accomplished with UV wavelength detection 550 nm for saponification sample, and HPLC was done under conditions: C18 analytical column of TC-C18, 4. 6 × 250 mm, column temperature at room temperature, injected sample volume was 10 μL, mobile phase’s methanol, flow-rate 0.8 ml/min and detection wavelength 280 nm.

Quivers of sections on toric orbifolds
Tarig M. H. Abdelgadir
Mathematics , 2010,
Abstract: Starting from a collection of line bundles on a projective toric orbifold X, we introduce a stacky analogue of the classical linear series. Our first main result extends work of King by building moduli stacks of refined representations of labelled quivers. We associate one such stack to any collection of line bundles on X to obtain our notion of a stacky linear series; as in the classical case, X maps to the ambient stack by evaluating sections of line bundles in the collection. As a further application, we describe a finite sequence of GIT wall crossings between [A^n/G] and G-Hilb(A^n) for a finite abelian subgroup G of SL(n,k) where n is less than or equal to 3.
Weighted projective lines as fine moduli spaces of quiver representations
Tarig Abdelgadir,Kazushi Ueda
Mathematics , 2014,
Abstract: We describe weighted projective lines in the sense of Geigle and Lenzing by a moduli problem on the canonical algebra of Ringel. We then go on to study generators of the derived categories of coherent sheaves on the total spaces of their canonical bundles, and show that they are rarely tilting. We also give a moduli construction for these total spaces for weighted projective lines with three orbifold points.
A brief historicity of the Diagnostic and Statistical Manual of Mental Disorders: Issues and implications for the future of psychiatric canon and practice
Shadia Kawa, James Giordano
Philosophy, Ethics, and Humanities in Medicine , 2012, DOI: 10.1186/1747-5341-7-2
Abstract: Translated into over twenty languages, referred to by clinicians from multiple schools, as well as by researchers, policy-makers, criminal courts, and third-party reimbursement entities [1], the Diagnostic and Statistical Manual of the American Psychiatric Association (DSM) enjoys a nearly hegemonic status as the reference for the assessment and categorization of mental disorders of all types - not only in the United States, but increasingly in Europe and more recently Asia. To be sure, the discipline and practice of psychiatry has changed since the first DSM was released, and with the fifth edition (DSM-V) currently in field trials in preparation for general release in spring 2013, there is renewed discussion - and debate - about whether this latest volume represents 1) a work of lessons learned from prior editions, and in this way may be seen as an epistemologically iterative step in defining and characterizing the often ambiguous if not enigmatic qualities of "mental disorder(s)", or 2) merely an embellished version of previous volumes that perpetuates misnomers and vagaries and thus fails to be anything more than of nominal value.Whether endorsed as a reasonable gold-standard or criticized as limited in scope and utility, what cannot be ignored is the effect - if not power - that the DSM has exerted, and continues to exert, both within psychiatry and society at-large. Therefore, it is important to consider if, and how the DSM-V will manifest impact in and upon the character and conduct of psychiatry, medicine and the social sphere. Toward this end, we pose a Socratic question - from where have the DSM and psychiatry come, and to where are they going? Thus, this essay seeks to analytically scrutinize - and contextualize - the major developments that have occurred in various editions of the DSM, focusing upon factors that motivated its development in 1952, and the multiple changes and repercussions various editions have effected in psychiatry over the past sixty y
Isolation, Characterization and Quantity Determination of Aristolochic Acids, Toxic Compounds in Aristolochia bracteolata L.
Abdelgadir A. Abdelgadir, Elhadi M. Ahmed and Mahgoub Sharif Eltohami
Environmental Health Insights , 2012, DOI: 10.4137/EHI.S6292
Abstract: Background: Aristolochic Acids (AAs) are major components of plants in Aristolochia and have been found to be nephrotoxic, carcinogenic and mutagenic. Herein reported are the isolation, identification and quantity determination methods of Aristolochic Acid-I (AA-I) and Aristolochic Acid-II (AA-II) toxic compounds of Aristolochia bracteolata indigenous to Central Sudan and medicinally used in diverse biological functions including analgesic and diuretic effects, treatment of tumors, malaria and/or fevers. Methods and results: AAs mixture was extracted with methanol from the defatted material of Aristolochia bracteolata whole plant at room temperature and was isolated from the aqueous methanol extract by chloroform. Moreover, Silica-gel column chromatography and Preparative Thin Layer Chromatography (PTLC) using chloroform/methanol gradient mixtures were used to isolate AAs mixtures as a yellow crystalline solid. A preliminary detection of AAs was made by Thin Layer Chromatography (silica-gel, chloroform: methanol (6:1)). The Rf value of the acids mixture was 0.43–0.46. The presence of AAs in plant sample was confirmed by High Performance Liquid Chromatography/Ultraviolet (HPLC/UV) analysis using 1% acetic acid and methanol (40:60) as mobile phase and maximum absorption wave length of 250 nm. Quantitative determination of AA-II (49.03 g/kg) and AA-I (12.98 g/kg) was also achieved by HPLC/UV. Recommendation: It is recommended that the use of Aristolochia bracteolata as a medicinal plant should be extremely limited or strictly prohibited. The chromatograms obtained in this study can serve as fingerprints to identify AAs in plant samples.
Isolation, Characterization and Quantity Determination of Aristolochic Acids, Toxic Compounds in Aristolochia bracteolata L.
Abdelgadir A. Abdelgadir,Elhadi M. Ahmed,Mahgoub Sharif Eltohami
Environmental Health Insights , 2011,
On the Performance of MPI-OpenMP on a 12 nodes Multi-core Cluster
Abdelgadir Tageldin Abdelgadir,Al-Sakib Khan Pathan,Mohiuddin Ahmed
Computer Science , 2011,
Abstract: With the increasing number of Quad-Core-based clusters and the introduction of compute nodes designed with large memory capacity shared by multiple cores, new problems related to scalability arise. In this paper, we analyze the overall performance of a cluster built with nodes having a dual Quad-Core Processor on each node. Some benchmark results are presented and some observations are mentioned when handling such processors on a benchmark test. A Quad-Core-based cluster's complexity arises from the fact that both local communication and network communications between the running processes need to be addressed. The potentials of an MPI-OpenMP approach are pinpointed because of its reduced communication overhead. At the end, we come to a conclusion that an MPI-OpenMP solution should be considered in such clusters since optimizing network communications between nodes is as important as optimizing local communications between processors in a multi-core cluster.
An anisotropic-Alfvenic-turbulence-based solar wind model with proton temperature anisotropy
Bo Li,Shadia Rifai Habbal
Physics , 2012,
Abstract: How the solar wind is accelerated to its supersonic speed is intimately related to how it is heated. Mechanisms based on ion-cyclotron resonance have been successful in explaining a large number of observations, those concerning the significant ion temperature anisotropy above coronal holes in particular. However, they suffer from the inconsistency with turbulence theory which says that the turbulent cascade in a low-beta medium like the solar corona should proceed in the perpendicular rather than the parallel direction, meaning that there is little energy in the ion gyro-frequency range for ions to absorb via ion-cyclotron resonance. Recently a mechanism based on the interaction between the solar wind particles and the anisotropic turbulence has been proposed, where the perpendicular proton energy addition is via the stochastic heating (Chandran et al. 2011). We extend this promising mechanism by properly accounting for the effect of proton temperature anisotropy on the propagation of Alfven waves, for the radiative losses of electron energy, and for the field line curvature that naturally accompanies solar winds in the corona. While this mechanism was shown in previous studies to apply to the polar fast solar wind, we demonstrate here for the first time that it applies also to the slow wind flowing along field lines bordering streamer helmets.
Journal of Engineering Science and Technology , 2009,
Abstract: Be short of well-defined networks boundaries, shared medium, collaborative services, and dynamic nature, all are representing some of the key characteristics that distinguish mobile ad hoc networks from the conventional ones. Besides, each node is a possible part of the essential support infrastructure, cooperate with each other to make basic communication services available. Forwarding packets or participating in routing process, either of each can directly affect the network security state. Nevertheless, ad hoc networks are suspectable to the same vulnerabilities and prone to the same types of failures as conventional networks. Even though immune-inspired approaches aren’t essentially new to the research domain, the percentage of applying immune features in solving security problems fluctuates. In this paper, security approach based on both immunity and multi-agent paradigm is presented. Distributability, second response, and self recovery, are the hallmarks of the proposed security model which put a consideration on high nodes mobility.
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