Lucerne transient streak virus; a Recently Detected Virus Infecting Alfafa (Medicago sativa) in Central Saudi Arabia

Raza, Ahmed,Al-Shahwan, Ibrahim M.,Abdalla, Omer A.,Al-Saleh, Mohammed A.,Amer, Mahmoud A. The Korean Society of Plant Pathology 2017 Plant Pathology Journal Vol.33 No.1

A survey was conducted to determine the status of Lucerne transient streak virus (LTSV) in three high-yielding alfalfa regions in central Saudi Arabia (Riyadh, Qassim, and Hail) during 2014. Three hundred and eight symptomatic alfalfa, and seven Sonchus oleraceus samples were collected. DAS-ELISA indicated that 59 of these samples were positive to LTSV. Two isolates of LTSV from each region were selected for molecular studies. RT-PCR confirmed the presence of LTSV in the selected samples using a specific primer pair. Percentage identity and homology tree comparisons revealed that all Saudi isolates were more closely related to each other but also closely related to the Canadian isolate-JQ782213 (97.1-97.6%) and the New Zealand isolate-U31286 (95.8-97.1%). Comparing Saudi isolates of LTSV with ten other sobemoviruses based on the coat protein gene sequences confirmed the distant relationship between them. Eleven out of fourteen plant species used in host range study were positive to LTSV. This is the first time to document that Trifolium alexandrinum, Nicotiana occidentalis, Chenopodium glaucum, and Lathyrus sativus are new host plant species for LTSV and that N. occidentalis being a good propagative host for it.

Lucerne transient streak virus; a Recently Detected Virus Infecting Alfafa (Medicago sativa) in Central Saudi Arabia

Ahmed Raza,Ibrahim M. Al-Shahwan,Omer A. Abdalla,Mohammed A. AL-Saleh,Mahmoud A. Amer 한국식물병리학회 2017 Plant Pathology Journal Vol.33 No.1

A survey was conducted to determine the status ofLucerne transient streak virus (LTSV) in three highyieldingalfalfa regions in central Saudi Arabia (Riyadh,Qassim, and Hail) during 2014. Three hundredand eight symptomatic alfalfa, and seven Sonchus oleraceussamples were collected. DAS-ELISA indicatedthat 59 of these samples were positive to LTSV. Twoisolates of LTSV from each region were selected formolecular studies. RT-PCR confirmed the presence ofLTSV in the selected samples using a specific primerpair. Percentage identity and homology tree comparisonsrevealed that all Saudi isolates were more closelyrelated to each other but also closely related to the Canadianisolate-JQ782213 (97.1–97.6%) and the NewZealand isolate-U31286 (95.8–97.1%). ComparingSaudi isolates of LTSV with ten other sobemovirusesbased on the coat protein gene sequences confirmedthe distant relationship between them. Eleven out offourteen plant species used in host range study werepositive to LTSV. This is the first time to documentthat Trifolium alexandrinum, Nicotiana occidentalis,Chenopodium glaucum, and Lathyrus sativus are newhost plant species for LTSV and that N. occidentalisbeing a good propagative host for it.

Mechanical behaviors of piezoelectric nonlocal nanobeam with cutouts

Mohamed A. Eltaher,Fatema-Alzahraa Omar,Azza M. Abdraboh,Waleed S. Abdalla,Amal E. Alshorbagy 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.25 No.2

This work presents a modified continuum model to explore and investigate static and vibration behaviors of perforated piezoelectric NEMS structure. The perforated nanostructure is modeled as a thin perforated nanobeam element with Euler.Bernoulli kinematic assumptions. A size scale effect is considered by included a nonlocal constitutive equation of Eringen in differential form. Modifications of geometrical parameters of perforated nanobeams are presented in simplified forms. To satisfy the Maxwell's equation, the distribution of electric potential for the piezoelectric nanobeam model is assumed to be varied as a combination of a cosine and linear functions. Hamilton's principle is exploited to develop mathematical governing equations. Modified numerical finite model is adopted to solve the equation of motion and equilibrium equation. The proposed model is validated with previous respectable work. Numerical investigations are presented to illustrate effects of the number of perforated holes, perforation size, nonlocal parameter, boundary conditions, and external electric voltage on the electro-mechanical behaviors of piezoelectric nanobeams.

Nonlinear thermal vibration of pre/post-buckled two-dimensional FGM tapered microbeams based on a higher order shear deformation theory

Asmaa A. Hendi,Mohamed A Eltaher,Salwa A Mohamed,Mohamed A. Attia,A.W. Abdalla 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.6

The size-dependent nonlinear thermomechanical vibration analysis of pre- and post-buckled tapered two-directional functionally graded (2D-FG) microbeams is presented in this study. In the context of the modified couple stress theory, the formulations are derived based on the parabolic shear deformation beam theory and von Karman nonlinear strains. Different thermomechanical material properties are assumed to be temperature-dependent and smoothly vary in both length and thickness directions using the power law and the physical neutral axis concept is employed. The nonlinear governing equations are derived using the Hamilton principle and the resulting variable coefficient equations of motion are solved using the differential quadrature method (DQM) and iterative Newton’s method for clamped-clamped and simply supported boundary conditions. Comparison studies are presented to validate the derived model and solution procedure. The impacts of induced thermal moments, temperature power index, two gradient indices, nonuniform cross-section, and microstructure length scale parameter on the frequency-temperature configurations are explored for both clamped and simply supported microbeams.

Households' dietary habits and food consumption patterns in Hamishkoreib locality, Kassala State, Sudan

Fatima A. Khalid,Awadia K.M. Ali,Siteldar A. Ali,Zemzem Y.A. Mosmar,Sarah S.M. Salih,Tahani K. Salman,Mohammed A. Desogi,Mohammed A. Soghaier,Eltayeb E. Mohammed,Abdalla A. Mohammed 한국식품연구원 2017 Journal of Ethnic Foods Vol.4 No.3

Background: Hamishkoreib is among the localities that have suffered most from chronic food insecurity in Kassala State, Sudan. This study was designed to determine the dietary habits and food consumption patterns in this locality. Methods: A descriptive cross-sectional survey was conducted among 403 households in the Hamishkoreib locality from June 2014 to February 2015. Sociodemographic and dietary information was collected through a modified food frequency questionnaire. The collected data were analyzed using SPSS 16.0 to estimate the frequency of variables. Results: Among 403 households, the incidence of informal education and illiteracy was 93.3%. Charcoal production and firewood cutting as the main source of income was reported by 66.6%. Three meals per day were consumed by 83.4% of households. They depended largely on cereal foods, particularly sorghum in the form of kissra and assida. Milk and dairy products were dominant in breakfast and dinner. Meat was consumed by 67.7% of households just once per week. However, chicken, fish, and eggs were rarely consumed (1.5%, 0.7%, and 19.8% respectively). Most (85.3%) households related poor or rare consumption of these protein- rich foods to culture, while 14.7% related it to financial reasons or illness. These types of food were mainly consumed by men and were not allowed to be consumed by women and children. Tea and coffee were excessively consumed in the morning and during the day. Fruit and vegetable consumption was low. Conclusion: The study revealed consumption of an unbalanced diet with insufficient proteins and micronutrients. There was excessive consumption of tea and coffee, which had a negative impact on food intake and absorption. The paper recommends launching a major nutrition program to encourage diversity of food consumption and to improve the capacity building of households.

Overlapped Electromagnetic Coilgun for Low Speed Projectiles

Hany M. Mohamed,Mahmoud A. Abdalla,Abdelazez Mitkees,Waheed Sabery 한국자기학회 2015 Journal of Magnetics Vol.20 No.3

This paper presents a new overlapped coilgun configuration to launch medium weight projectiles. The proposed configuration consists of a two-stage coilgun with overlapped coil covers with spacing between them. The theoretical operation of a multi-stage coilgun is introduced, and a transient simulation was conducted for projectile motion through the launcher by using a commercial transient finite element software, ANSOFT MAXWELL. The excitation circuit design for each coilgun is reported, and the results indicate that the overlapped configuration increased the exit velocity relative to a non-overlapped configuration. Different configurations in terms of the optimum length and switching time were attempted for the proposed structure, and all of these cases exhibited an increase in the exit velocity. The exit velocity tends to increase by 27.2% relative to that of a non-overlapped coilgun of the same length.

Optimal WAMS Configuration in Nordic Power System

Mohamed A.M. Hassan,Omar H. Abdalla,Hady H. Fayek,Aisha H.A. Hashim,Siti Fauziah Toha International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.3

The Smart grids are considered as multi-disciplinary power systems where the communication networks are highly employed. This paper presents optimal wide area measurement system (WAMS) configuration in Nordic power system. The transition from SCADA to WAMS becomes now trend in all power systems to ensure higher reliability and data visibility. The optimization applied in this research considered the geographical regions of the Nordic power system. The research considered all the devices of WAMS namely phasor measurement units (PMUs), phasor data concentrators (PDCs) and communication links. The study also presents two scenarios for optimal WAMS namely base case and N-1 contingency as different operating conditions. The result of this research presents technical and financial results for WAMS configuration in a real power system. The optimization results are performed using MATLAB 2017a software application.

Chemical Constituents and Biological Activities of Cichorium intybus L.

Abdalla M. El-Lakany,Maha A. Aboul-Ela,Mohamed M. Abdul-Ghani,Hattem Mekky 한국생약학회 2004 Natural Product Sciences Vol.10 No.2

Continuation of a phytochemical study of Cichorium intybus L. (Astraceae) growing in Egypt, resulted in the isolation and identification of a new sesquiterpene lactone 3, 4-dihydrolactucin, in addition to the eight known compounds; kaempferol, isoscutellarin, cichoriin, umbelliferone, lupeol, lupeol acetate, β-sitosterol, and β-sitosterol-3-O-glucoside. Chemical structures of the isolated compounds were assigned based on different physical, chemical, and spectroscopic techniques including IR, UV, MS, 1D- and 2D-NMR spectra. Furthermore, the antimicrobial, and spasmogenic activities of some fractions and isolates were also assessed.

Mechanical analysis of cutout piezoelectric nonlocal nanobeam including surface energy effects

Mohamed A Eltaher,Fatema-Alzahraa Omar,Waleed S. Abdalla,Abdallah M. Kabeel,Amal E. Alshorbagy 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.1

This manuscript tends to investigate influences of nanoscale and surface energy on a static bending and free vibration of piezoelectric perforated nanobeam structural element, for the first time. Nonlocal differential elasticity theory of Eringen is manipulated to depict the long–range atoms interactions, by imposing length scale parameter. Surface energy dominated in nanoscale structure, is included in the proposed model by using Gurtin–Murdoch model. The coupling effect between nonlocal elasticity and surface energy is included in the proposed model. Constitutive and governing equations of nonlocal-surface perforated Euler–Bernoulli nanobeam are derived by Hamilton’s principle. The distribution of electric potential for the piezoelectric nanobeam model is assumed to vary as a combination of a cosine and linear variation, which satisfies the Maxwell’s equation. The proposed model is solved numerically by using the finite-element method (FEM). The present model is validated by comparing the obtained results with previously published works. The detailed parametric study is presented to examine effects of the number of holes, perforation size, nonlocal parameter, surface energy, boundary conditions, and external electric voltage on the electro-mechanical behaviors of piezoelectric perforated nanobeams. It is found that the effect of surface stresses becomes more significant as the thickness decreases in the range of nanometers. The effect of number of holes becomes significant in the region 0.2≤α≤0.8. The current model can be used in design of perforated nano-electro-mechanical systems (PNEMS).

Synthesis of a new series of angiotensin II receptor antagonists and antibacterial agents

Thoraya A. Farghaly,Sobhi M. Gomha,Mohamed M. Abdalla 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3

2-(Arylmethylenehydrazono)-4,4-diphenyl-1Himidazol-5(4H)-one 3 underwent regioselective cyclizationupon treatment with bromine in acetic acid containingsodium acetate to give the respective 3-substituted-6,6-diphenyl-6,7-dihydro-imidazo[2,1-c][1,2,4]triazole-5-one 4in overall good yields and not the isomeric structure 5. Inaddition, compound 4 was synthesized by alternativemethod via reaction of compound 1 with different acids inacetic acid. The synthesized hydrazone derivatives werescreened for their angiotensin II receptor antagonistsactivity and the results showed promising activity. Also,imidazo[2,1-c][1,2,4]triazole-5-ones 4 were screened forthe antibacterial activity and the result revealed that twoderivatives have excellent activity.