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Endemics and endangered species in the biodiversity hotspot of the Shada Mountains, Saudi Arabia

Journal of Arid Land 2017年第1期9卷 109-121页

作者： Jacob THOMAS mohamed A el-SHEIKH Abdulrehman A ALATAR Department of Botany & Microbiology College of Science King Saud University Riyadh 11451 Saudi Arabia Botany Department Faculty of Science Damanhour University Damanhour 22516 Egypt

Shada Mountains in Saudi Arabia, separated by Maleel Wadi into twin mountains（i.e., Shada Alalah and Shada Asfal）, are rich in biodiversity. We investigated the diversity of endemics and endangered species of the mountains based on the data collected from 38 stands falling in 8 elevational zones ranging from 500 to 2215 m a.s.l. Results indicated that 495 plant species falling in 314 genera and 76 families occurred in the Shada Mountains, including 19 endemic species and 43 endangered species, and accounting for 22% of the total flora in Saudi Arabia. Canonical correlation analysis indicated that physiographic features, particularly altitude play an important role in the frequency and abundance of species. Endemics were not evenly distributed in the Shada Mountains and mostly restricted in the elevation zone of 1000–1500 or ＆gt;1500 m a.s.l. When the altitude reached up to 2000 m a.s.l., the endemics decreased substantially due to the significantly low temperature. The endangered species existed three different distribution patterns：（i） most endangered species distributed in the altitudes of 1000–1800 m a.s.l.;（ii） endangered trees, lianas, and shrubs occupied the altitudes 1000–1300 m a.s.l.; and（iii） endangered subshrubs and herbs inhabited the altitudes 1500–2100 m a.s.l. The results demonstrated that the biodiversity of endangered species in the Shada Mountains is high and undisturbed by invasive species, and protective measures should be taken against human disturbances to the small-scale hotspot.

关键词： elevational gradient invasion Shada Alalah Shada Asfal Wadi Jof

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Cuticular hydrocarbons in two parapatric species of ants and their hybrid

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Integrative Zoology 2011年第3期6卷 259-265页

作者： mohamed el-SHEHABY mohamed Sayed SALAMA elisabeth BRUNNER Jürgen HEINZE Biologie I University of RegensburgRegensburgGermany Department of Entomology Ain Shams UniversityCairoEgypt

Discrimination between nestmates and non-nestmates in social insects is thought to rely on the pattern of cuticular *** investigated the cuticular hydrocarbon profiles of 2 parapatric sibling ant species,Temnothorax nylanderi(Förster,1850)and Temnothorax crassispinus(Karavaiev,1926),and their *** found that although the profiles show considerable similarities,a discriminant analysis based on the relative peak areas of cuticular hydrocarbons separates the 3 *** profiles of hybrids were not consistently intermediate between those of the paternal species,suggesting either non-additive interactions among the parental biosynthetic pathways or systematic differ-ences in environment-derived odor cues.

关键词： colony odor cuticular hydrocarbons hybridization Temnothorax

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Effective participation of wind turbines in frequency control of a two-area power system using coot optimization

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Protection and Control of Modern Power Systems 2023年第1期8卷 230-244页

作者： Mahmoud Hussain el-Bahay Mohammed elsayed Lotfy mohamed A.el-Hameed electrical Power and Machines Department Faculty of EngineeringZagazig UniversityZagazig 44519Egypt ECEN Department Faculty of EngineeringA’Sharqiyah University400 IbraOman

In this paper,load frequency control is performed for a two-area power system incorporating a high penetration of renewable energy sources.A droop controller for a type 3 wind turbine is used to extract the stored kinetic energy from the rotating masses during sudden load *** auxiliary storage controller is applied to achieve effec-tive frequency *** coot optimization algorithm(COA)is applied to allocate the optimum parameters of the fractional-order proportional integral derivative(FOPID),droop and auxiliary storage *** fitness function is represented by the summation of integral square deviations in tie line power,and Areas 1 and 2 frequency *** robustness of the COA is proven by comparing the results with benchmarked optimizers including:atomic orbital search,honey badger algorithm,water cycle algorithm and particle swarm *** assessment is confirmed in the following four scenarios:(i)optimization while including PID controllers;(ii)optimization while including FOPID controllers;(iii)validation of COA results under various load disturbances;and(iv)validation of the proposed controllers under varying weather conditions.

关键词： Coot optimizer FOPID Load frequency control Photovoltaic Variable speed wind turbine

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Radioactivity and mineralogy of the altered granites of the Wadi Ghadir shear zone, South Eastern Desert, Egypt

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Chinese Journal Of Geochemistry 2012年第1期31卷 30-40页

作者： mohamed F.Raslan mohamed G.el-Feky Nuclear Materials Authority El Maadi P.O.Box 530CairoEgypt

Quartz-diorite, gneissose granodiorites, two-mica granite and perthite leucogranie are the main rock units cropping out in the Wadi Ghadir area, South Eastern Desert of Egypt. Along the NNE-SSW mega-faults, a broad brittle shear zone is developed in the Ghadir two-mica granite. Brittle deformation is manifested by severe myloniti-zation and alteration of these granites. These sheared altered granites are characterized by the presence of radioactive mineralization, associated with alteration features such as silicification, hematization and kaolinitization. Radioelement measurements revealed that the unaltered and altered two-mica granites are considered as uraniferous granites. The average uranium and thorium contents in the unaltered two-mica granites are 12.29×10-6 and 19.81×10-6, respectively, and the average Th/U ratio is 1.62. The altered granites exhibit higher concentrations of U (averaging 97.949), but have lower Th and Th/U ratios (13.83 and 0.16, respectively), which indicates uranium enrichment in the granites. Binary relations of eTh/eU against either eU or eTh and eU with eTh in the studied gran-ites suggest that the distribution of radioactive elements not only magmatic (positive correlation between eU and eTh), but also due to hydrothermal redistribution of radioelements (weak correlation between eU and eTh/eU). The magmatic U and Th are indicated by the presence of uraninite, thorite, zircon and monazite whereas the evidence of hydrothermal mineralization is the alteration of rock-forming minerals such as feldspar and the forma-tion of secondary minerals such as uranophane and pyrite. Microscopic, XRD and scanning electron microscopic studies revealed the presence of uraninite, uranophane, thorite, Ce-monazite and zircon, in addition to phlogopite-fluor mica in the studied altered granites of the Wadi Ghadir shear zone.

关键词：二云母花岗岩放射性元素脆性剪切带蚀变特征矿物学沙漠埃及扫描电子显微镜

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pH-indicative Films Based on Chitosan–PVA/Sepiolite and Anthocyanin from Red Cabbage: Application in Milk Packaging

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Journal of Bionic Engineering 2022年第3期19卷 837-851页

作者： Marya Raji Laila el Foujji mohamed el Mehdi Mekhzoum Mounir el Achaby Hamid Essabir Rachid Bouhfid Abou el kacem Qaiss Moroccan Foundation for Advanced Science Innovation and ResearchComposites and Nanocomposites CenterRabat Design CenterRue Mohamed El JazouliMadinat El IrfaneRabat10100Morocco Faculty of Science Laboratoire de Chimie Organique Et HétérocycliqueUniversity Mohammed V in RabatRabat10100Morocco Materials Science and Nano-Engineering Department Mohammed VI Polytechnic UniversityLot 660–Hay Moulay RachidBen Guerir43150Morocco Mechanic Materialsand Composites(MMC)Laboratory of Energy EngineeringMaterials and SystemsNational School of Applied Sciences of AgadirIbn Zohr UniversityAgadir80000Morocco

Biobased smart packaging is been the most interesting research *** this study,pH-sensitive films based on anthocyanin molecules from red cabbage and sepiolite mineral nano-clay as functional additives were *** films were fabricated by casting method of blend polymer Chitosan/Poly(Vinyl Alcohol)at two fillers loading(5wt.%and 10wt.%).The structural,morphological,thermal,optical,hygroscopic,and mechanical properties as well as the pH sensitivity of films were *** thermal properties confirm that the amount of the anthocyanin in sepiolite was around 6.4%.The tensile strength and the young’s modulus of produced composites at 10wt.%sepiolite–anthocyanin content was increased to 8.90 MPa and 163 MPa,*** maximum water absorption that the films may absorb was 12.3%.pH sensitivity analysis showed that the Smart films change the color by changing the pH level,from pink at pH lower than 6 to yellow at pH higher than ***,the developed pH-sensitive films show band gaps in visible light that make them useful for monitoring milk spoilage.

关键词： Smart packaging Anthocyanin Red cabbage pH-sensitive and milk spoilage

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Barrett’s esophagus in a patient with bulimia nervosa:A case report

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World Journal of Clinical Cases 2022年第17期10卷 5841-5845页

作者： Ahmed Gouda mohamed el-Kassas Department of Gastroenterology NMC Ruwais HospitalAbu Dhabi 14638United Arab Emirates Department of Endemic Medicine Faculty of MedicineHelwan UniversityCairo 11795Egypt

BACKGROUND Barrett’s esophagus is a known complication of long-standing gastroesophageal reflux disease,and it is a potential risk factor of developing esophageal *** SUMMARY Here,we present a case of a 47-year-old male patient referred to the gastroenterology clinic for upper endoscopy because he has a long-standing history of heartburn and vomiting after *** examination,he had characteristic findings of self-induced vomiting as abrasions and callosities on the dorsum of the right hand and dental erosions.A detailed history revealed that he had 17 years of binge eating with self-induced *** upper endoscopy showed gastroesophageal reflux grade D with salmon-red mucosal projections,and the biopsy revealed intestinal mucosal *** This case emphasized the importance of considering upper endoscopy screening for Barrett’s esophagus in patients with eating disorders,especially those with self-induced vomiting,as in bulimia nervosa.

关键词： Barrett’s esophagus Bulimia nervosa Gastroesophageal reflux disease Case report

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Hepatitis B virus as a risk factor for hepatocellular carcinoma:There is still much work to do

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Liver Research 2024年第2期8卷 83-90页

作者： Walaa Abdelhamed mohamed el-Kassas Endemic Medicine Department Sohag UniversitySohagEgypt Endemic Medicine Department Faculty of MedicineHelwan UniversityCairoEgypt Liver Disease Research Center College of MedicineKing Saud UniversityRiyadhSaudi Arabia

Hepatitis B virus(HBV)infection is a significant health problem that can result in progression to liver cirrhosis,decompensation,and the development of hepatocellular carcinoma(HCC).On a country level,the prevalence of chronic HBV infection varies between 0.1%and 35.0%,depending on the locality and the population being ***-third of all liver cancer fatalities worldwide are attributable to *** adoption of standard birth-dose immunization exerted the most significant impact on the decline of HBV *** incidence ranges from 0.01%to 1.40%in noncirrhotic patients and from 0.9%to 5.4%annually,in the settings of liver *** antiviral therapy significantly reduces the risk of developing HBV-related HCC,studies have demonstrated that the risk persists,and that HCC screening is still *** review discusses the complex relationship between HBV infection and HCC,recent epidemiological data,different aspects of clinical disease characteristics,and the impact of antiviral therapy in this context.

关键词： Hepatitis B virus(HBV) Hepatocellular carcinoma(HCC) HBV vaccine Carcinogenesis Antiviral therapy

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Semial ophiolite veins of United Arab Emirates―A fluid inclusions study

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Chinese Journal Of Geochemistry 2011年第3期30卷 290-294页

作者： mohamed el Tokhi Abdulla Musallam Geology Department College of Science United Arab Emirates University. United Arab Emirates

Calcite and quartz veins in the gabbroic and dunite rocks of the Semial ophiolite (UAE) were selected for fluid inclusion analysis. The inclusions contain both aqueous low-salinity and hydrocarbon-dominated fluids. Mi-crothermometry data indicate that the aqueous fluids contain 0.22 to 1.45 equivalent wt% NaCl and occasionally contain traces of hydrocarbons. Homogenization to liquid occurred between 91 and 152℃. Modeling based on these fluid inclusion observations indicates that the trapping conditions of the studied rocks were subjected to temperatures of 162 and 172℃, occasional pressures of 610-710 Pa and the sequence percolation of aqueous and hydrocarbon fluids.

关键词：流体包裹体阿拉伯联合酋长国蛇绿岩碳氢化合物岩脉 NaCl胁迫低矿化度模型显示

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Macrobenthos monitoring in the Gulf of Suez,Egypt

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Acta Oceanologica Sinica 2008年第2期27卷 55-80页

作者： mohamed M.el-Komi National Institute of Oceanography and Fisheries

The biogeography of macrobenthic communities with large-scale differences in species distribution and abundance was studied along the eastern and western coastal regions of the Gulf of Suez to indicate biodiversity of benthos in relation to the prevailing environmental conditions. In general, benthos have a wide variety of species of mainly polychaet worms, crustaceans, bivalves, and other bottom invertebrates living in burrows in/or on the sediment surface. Coastal development clearly affects the ecosystem after the construction of coastal projects. The highest values of benthic diversity, evenness, richness and dominance are found at the Gulf of Suez （WG 1, WG 3）, Ras Gharib （WG 7, WG 8） and Ras Shukier （WG 9a） by contrast to others. The abundance of macrobenthic organsims along the coasts of Gulf of Suez can be arranged in the following sequence： other groups （34%） greater than crustaceans （25%） greater than polychaetes （22%） greater than molluscs （17%） greater than echinoderms （2%）. The biomass of benthic assemblages at different sampling sites can also be ranked as follows： echinoderms （52%） greater than molluscs （27%） greater than crustaceans （16%） greater than polychaetes （2%） greater than other groups （3%）. Some benthic groups or species indicated a distinctive correlation to pollution sources in the marine ecosystem which obviously increased in the coastal areas due to the extension of the coastal development. These activities needed regular information to establish database for the biology and distribution of marine benthic communities. The density and diversity of benthos are significantly affected by eutrophication at Ain Sukhna, whereas the benthos in the open Gulf of Suez do not seem to be adversely affected by pollution.

关键词： macrobenthos assessment impact Gulf of Suez

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Hepatocellular carcinoma recurrence:Predictors and management

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Liver Research 2023年第4期7卷 321-332页

作者： Walaa Abdelhamed mohamed el-Kassas Endemic Medicine Department Sohag UniversitySohagEgypt Endemic Medicine Department Faculty of MedicineHelwan UniversityCairoEgypt

Hepatocellular carcinoma(HCC),the sixth most common cancer globally,is associated with high mortality rates and more than 830,000 annual *** advances in the available management options including surgical resection and local ablative therapies,recurrence rates after the initial treatment exceed 50%,even among patients who have undergone curative-intent ***,postsurgical HCC recurrence occurs in about 70%of cases five years *** management of recurrent HCC remains *** review discusses different predictors for HCC recurrence after each treatment modality and different approaches available to stratify these *** specific guidelines for managing HCC recurrence and strict surveillance protocols for such recurrence after initial HCC management are needed.

关键词： Hepatocellular carcinoma(HCC) Recurrence Ablation Liver resection Liver transplantation

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