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Effect of Elevated CO_2 and Drought on Soil Microbial Communities Associated with Andropogon gerardii

Journal of Integrative Plant Biology 2008年第11期50卷 1406-1415页

作者： Issmat I. kassem Puneet Joshi Yon Sigler Scott Heckathorn Qi Wang Department of Environmental Sciences University of Toledo Ohio 43606 USA Department of Civil Engineering University of Toledo Ohio 43606 USA

Our understanding of the effects of elevated atmospheric CO2, singly and in combination with other environmental changes, on plant-soil interactions is incomplete. Elevated CO2 effects on C4 plants, though smaller than on C3 species, are mediated mostly via decreased stomatal conductance and thus water loss. Therefore, we characterized the interactive effect of elevated CO2 and drought on soil microbial communities associated with a dominant C4 prairie grass, Andropogon gerardii Vitman. Elevated CO2 and drought both affected resources available to the soil microbial community. For example, elevated CO2 increased the soil C：N ratio and water content during drought, whereas drought alone decreased both. Drought significantly decreased soil microbial biomass. In contrast, elevated CO2 increased biomass while ameliorating biomass decreases that were induced under drought. Total and active direct bacterial counts and carbon substrate use （overall use and number of used sources） increased significantly under elevated CO2. Denaturing gradient gel electrophoresis analysis revealed that drought and elevated CO2, singly and combined, did not affect the soil bacteria community structure. We conclude that elevated CO2 alone increased bacterial abundance and microbial activity and carbon use, probably in response to increased root exudation. Elevated CO2 also limited drought-related impacts on microbial activity and biomass, which likely resulted from decreased plant water use under elevated CO2. These are among the first results showing that elevated CO2 and drought work in opposition to modulate plant-associated soil-bacteria responses, which should then influence soil resources and plant and ecosystem function.

关键词： denaturing gradient gel electrophoresis drought elevated CO2 soil microbial communities.

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Atorvastatin-induced severe gastric ulceration: A case report

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World Journal of Gastroenterology 2005年第20期11卷 3159-3160页

作者： Ihab I El-Hajj Fadi H Mourad Nina S Shabb kassem A Barada Department of Internal Medicine American University of Beirut Medical Center(AUBMC) Beirut Lebanon Department of Pathology AUBMC Beirut Lebanon

A 41-year-old man presented with severe gastric ulceration 3 mo after beginning treatment with atorvastatin 20 mg once daily for hypercholesterolemia. The patient was not taking any ulcerogenic drugs and had no evidence of Helicobacter pylori infection. Proton pump inhibitor therapy was initiated and atorvastatin was replaced by simvastatin with complete resolution of gastrointestinal symptoms. To our knowledge, this is the first report of atorvastatin-induced gastric ulceration,which should be looked for in patients who develop abdominal pain while on this drug.

关键词： Atorvastatin Drug toxicity Gastric ulceration

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Celiac disease in Middle Eastern and North African countries:A new burden?

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World Journal of Gastroenterology 2010年第12期16卷 1449-1457页

作者： kassem Barada Abbas Bitar Mohamad Abdul-Razak Mokadem Jana Ghazi Hashash Peter Green Division of Gastroenterology Department of Internal MedicineAmerican University of Beirut Medical Center Department of Internal Medicine American University of Beirut Medical Center Department of Internal Medicine Indiana University School of Medicine Department of Internal Medicine University of Pittsburgh Medical Center Division of Gastroenterology Department of Internal MedicineColumbia University College of Physicians and Surgeons

Celiac disease(CD) is now recognized as a common disorder among Middle Eastern(ME) and North African(NA) *** aim of this review is to assess the available data regarding CD in the ME and NA and to compare this information with that of Western countries.A literature review was performed using the electronic databases PubMed and Medline(1950-2008) as search engines,and "celiac disease" was used as a Mesh *** search was limited to ME and NA *** prevalence of CD in ME and NA countries among low risk populations is similar to that of Western countries,but is higher in high risk populations such as those with type 1 *** is underestimated because of lack of clinical suspicion and lack of patient *** presentations in term of gastrointestinal,hematologic,skeletal,and liver manifestations are similar between both populations except for a high prevalence of short stature in some ME and NA *** studies have addressed atypical or silent *** in the West,diagnosis is initially made by serological tests and is confirmed by small intestinal ***-free diet is the main mode of treatment with a higher apparent adherence rate than in the *** disease complications result from *** disease is strongly associated with HLA DQ2 and to a lesser extent with HLA DQ8 *** conclusion,CD prevalence is underestimated,with little data available about its malignant *** parameters in the ME and NA are otherwise similar to those in Western countries.

关键词： Celiac disease Gluten-free diet Insulin dependent diabetes mellitus Iron defi ciency anemia Middle East

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Propagation of Electron Acoustic Soliton,Periodic and Shock Waves in Dissipative Plasma with a q-Nonextensive Electron Velocity Distribution

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Communications in Theoretical Physics 2015年第11期64卷 529-536页

作者： A.M.El-Hanbaly E.K.El-Shewy A.Elgarayhi A.I.kassem Theoretical Physics Group Faculty of ScienceMansoura University Department of Physics Taibah University

The nonlinear properties of small amplitude electron-acoustic(EA) solitary and shock waves in a homogeneous system of unmagnetized collisionless plasma with nonextensive distribution for hot electrons have been investigated.A reductive perturbation method used to obtain the Kadomstev-Petviashvili-Burgers *** analysis has been discussed for non-dissipative system in the absence of Burgers term and reveals different classes of the traveling wave *** obtained solutions are related to periodic and soliton waves and their behavior are shown *** the presence of the Burgers term,the EXP-function method is used to solve the Kadomstev-Petviashvih-Burgers equation and the obtained solution is related to shock *** obtained results may be helpful in better conception of waves propagation in various space plasma environments as well as in inertial confinement fusion laboratory plasmas.

关键词： electron-acoustic solitary and shock waves reducti

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Wilson's disease in Lebanon and regional countries: Homozygosity and hepatic phenotype predominance

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World Journal of Gastroenterology 2017年第36期23卷 6715-6725页

作者： kassem Barada aline El Haddad Meghri Katerji Mustapha Jomaa Julnar Usta Department of Internal Medicine American University of Beirut Medical Center Department of Biochemistry and Molecular Genetics Faculty of Medicine American University of Beirut

AIM To determine the phenotypes and predominant diseasecausing mutations in Lebanese patients with Wilson's disease,as compared to regional non-European *** The clinical profile of 36 patients diagnosed in Lebanon was studied and their mutations were determined by molecular *** patients underwent full physical exam,including ophthalmologic slit-lamp examination ultrasound imaging of the liver,as well as measurement of serum ceruloplasmin and 24-h urinaryCu *** addition,genetic screening using PCR followed by sequencing to determine disease-causing mutations and polymorphisms in the ATP7B gene was carried on extracted DNA from patients and immediate family *** phenotypic-genotypic findings were then compared to reported mutations in Wilson's disease patients from regional Arab and non-European countries. RESULTS Patients belonged to extended consanguineous *** majority were homozygous for the disease-causing mutation,with no predominant mutation identified. The most common mutation,detected in 4 out of 13families,involved the ATP hinge region and was present in patients from Lebanon,Egypt,Iran and ***,mutations in Lebanese patients and those of the region were scattered over 17 exons of *** the homozygous exon 12 mutation Trp939Cys was only detected in patients from Lebanon but none from the regional countries,the worldwide common mutation H1069Q was not present in the Lebanese and was rare in the *** hepatic phenotype was predominant in patients from both Lebanon and the region(25%-65%).Furthermore,the majority of patients,including those who were asymptomatic,had evidence of some hepatic *** neurologic phenotype was rare. CONCLUSION Findings do not support presence of a founder *** and genetic screening is recommended for family members with index patients and unexplained hepatic dysfunction.

关键词： Wilson Disease Cu-metabolism Phenotype Genotype ATP7B Hepatic manifestations

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Giant sporadic fundic gland polyp:Endoscopic and endosonographic features and management

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World Journal of Gastroenterology 2008年第42期14卷 6593-6595页

作者： Ihab I El Hajj Mohamad Hawchar Assaad Soweid Karim Maasri Ayman Tawil kassem A Barada Department of Internal Medicine Division of Gastroenterology and Hepatology American University of Beirut Medical Center PO Box 11-0236 Beirut 11072020 Lebanon Department of Pathology and Laboratory Medicine American University of Beirut Medical Center Beirut 11072020 Lebanon

Fundic gland polyps are the most common gastric polyps. They are usually small in size, sporadic and asymptomatic. We present a case of giant fundic gland polyp. Our case is particular because of the clinical presenta... 详细信息

关键词： Fundic gland polyp Anemia Endoscopic ultrasonography

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Analysis of strong refractive effect within 11Li projectile structure

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Chinese Physics C 2021年第2期45卷 414-425页

作者： kassem O.Behairy M.El-Azab Farid Awad A.Ibraheem Ola Ramadan M.Anwar Physics Department Aswan UniversityAswan 81528Egypt Physics Department Assiut UniversityAssiut 71516Egypt Physics Department King Khalid UniversityAbhaSaudi Arabia Physics Department Al-Azhar UniversityAssiut 71524Egypt

In the context of the double folding optical model,the strong refractive effect for elastic scattering of 11Li+12C and 11Li+28Si systems at incident energies of 29,50,and 60 MeV/n is *** folded potentials are generated based on a variety of nucleon-nucleon interactions with the suggested density distributions for the halo structure of 11Li *** rearrangement term(RT)of the extended realistic density dependent CDM3Y6 effective interaction is *** imaginary potential was taken in the traditional standard Woods-Saxon *** results for the calculated potentials are obtained,with a slight effect of the RT in CDM3Y6 *** reproduction with a normalization factor close to one for the observed angular distributions of the elastic scattering differential cross section has been achieved using the derived *** obtained reaction cross-section is studied as a guide by extrapolating our calculations and previous results.

关键词： optical model elastic and inelastic scattering halo nuclei folding model refraction effect

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Locally Varying Hubble Parameter in Terms of Reduced Friedmann Equation

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International Journal of Astronomy and Astrophysics 2021年第2期11卷 175-189页

作者： Ayman kassem Egyptair Cairo Egypt

Assessment of the Hubble parameter as an indicator of the expansion rate of the universe holds a central position in the field of astronomy. From its initial estimate of about 500 km⋅sec-1⋅parsc-1, this value had been steadily amended as the observational tools became more accurate and precise. Despite this, a gap remains between the value of observations relating to local and nonlocal estimations of the Hubble parameter that gave rise to what became known as the Hubble tension. This tension is addressed here while dealing with space fabric as a cosmological fluid that undergoes transition.

关键词： Cosmic Fluid Transition Locally Varying Hubble Parameter Energy Degrees of Freedom

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Promoting People-Centered Arab Chinese Cooperation

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International Understanding 2018年第3期 52-55页

作者： kassem Tofailli Arab China Association for Cooperation and Development Silk Road Business Consulting Company China Arab Exposition East and West Gate International Co. Ltd.

Allow me,first,to express our pleasure and appreciation of becoming one of Silk Road NGO Cooperation Network SIRONET *** look forward to playing an effective role as the first Arab organization to join your organization.

关键词： express our pleasure appreciation organization

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Hydro Matrix Power Wheels Generate More than 5 GW/h from Main Branch Canals (River Nile) in Egypt

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Journal of Power and Energy Engineering 2016年第3期4卷 71-78页

作者： Hesham F. A. Hamed Ahmed M. kassem Medhat E. M. ali Faculty of Engineering Elminia University Minya Egypt Faculty of Engineering Sohag University Sohag Egypt

In this paper, a new hydromatrix power wheels generation unit is presented. This presented hydromatrix power unit is aimed to convert the water movement in the main river branches into electrical power. It is found that the generated power based on the proposed hydromatrix power can be generated about 5 GW/h in Egypt. The proposed hydromatrix power unit based on the under shot water wheel type and the generated electrical power using this proposed unit is calculated at head;difference equal to 1 meter is presented.

关键词： Hydromatrix Scheme Electrical Energy Development Electricity Renewable Energy Project Financing Egypt

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