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Macrobenthos monitoring in the Gulf of Suez,Egypt

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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An early discharge approach for managing hospital capacity

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第1期8卷 83-95页

作者： Israa mohamed Ibrahim el-Henawy Ramadan Zean el-Din Department of Computing and Information Zagazig University 44519 ZagazigEgypt Institute of Statistical Studies and Research Cairo University 12613 GizaEgypt

The Kidney and Oncology Departments at Zagazig University Hospital are suffering from increased demand and limited *** patients who find all beds occupied are simply turned away,i.e.,no waiting is *** paper investigates the impact of an early discharge approach that can be applied to patients that have been scheduled to discharge within 5 h.A discrete event simulation(DES)model is built using empirical distributions based on real *** model has been validated against real data and the results have shown that the proposed early discharge approach can reduce the number of turned away patients by 10%in the Kidney Department,equivalent to 182 patients annually and by 11%in the Oncology Department,equivalent to 150 patients annually.

关键词： Simulation optimization discrete event simulation

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Real time endoscopic ultrasound elastography and strain ratio in the diagnosis of solid pancreatic lesions

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World Journal of Gastroenterology 2017年第32期23卷 5962-5968页

作者： Hussein Okasha Shaimaa elkholy Ramy el-Sayed mohamed-Naguib Wifi mohamed el-Nady Walid el-Nabawi Waleed A el-Dayem mohamed I Radwan Ali Farag Yahya el-sherif Emad Al-Gemeie Ahmed Salman mohamed el-Sherbiny Ahmed el-Mazny Reem E Mahdy Internal Medicine Department Cairo University Department of Tropical Medicine Zagazig University Internal Medicine Department Beni Suef University Tropical Medicine Department El Manial Specialized Hospital Pathology Department National Cancer InstituteCairo University Internal Medicine Department Assiut University

AIM To evaluate the accuracy of the elastography score combined to the strain ratio in the diagnosis of solid pancreatic lesions(SPL). METHODS A total of 172 patients with SPL identified by endoscopic ultrasound were enrolled in the study to evaluate the efficacy of elastography and strain ratio in differentiating malignant from benign lesions. The semi quantitative score of elastography was represented by the strain ratio method. Two areas were selected, area(A) representing the region of interest and area(B) representing the normal area. Area(B) was then divided by area(A). Sensitivity, specificity, positive predictive value(PPV), negative predictive value(NPV), and accuracy were calculated by comparing diagnoses made by elastography, strain ratio and final *** SPL were shown to be benign in 49 patients and malignant in 123 patients. elastography alone had a sensitivity of 99%, a specificity of 63%, and an accuracy of 88%, a PPV of 87% and an NPV of 96%. The best cut-off level of strain ratio to obtain the maximal area under the curve was 7.8 with a sensitivity of 92%, specificity of 77%, PPV of 91%, NPV of 80% and an accuracy of 88%. Another estimated cut off strain ratio level of 3.8 had a higher sensitivity of 99% and NPV of 96%, but with less specificity, PPV and accuracy 53%, 84% and 86%, respectively. Adding both elastography to strain ratio resulted in a sensitivity of 98%, specificity of 77%, PPV of 91%, NPV of 95% and accuracy of 92% for the diagnosis of SPL. CONCLUSION Combining elastography to strain ratio increases the accuracy of the differentiation of benign from malignant SPL.

关键词： Endoscopic Ultrasound elastography Strain Ratio Real Time Pancreatic lesions

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Excimer laser 6^(th)generation:state of the art and refractive surgical outcomes

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Eye and Vision 2015年第1期2卷 44-52页

作者： mohamed el Bahrawy Jorge L Alió Vissum Corporación Alicante AlicanteSpain Division of Ophthalmology Universidad Miguel HernándezAlicanteSpain Clinical research fellow in Vissum Corporación Alicante Universidad Miguel HernándezAlicanteSpain Avda de Denia s/n Edificio Vissum03016 AlicanteSpain

After nearly three decades of innovation in excimer laser,today we are presented with a state of the art generation targeting minimally invasive refractive surgery with high speed laser,faster trackers,pupil monitoring systems and better customization *** systems are capable of delivering better treatments with less induced postoperative high order *** results reported by many authors had confirmed the superiority in efficiency and safety profiles of this generation compared to previous ***,current technology is facing major challenges in the correction of high hyperopic errors and in presbyopic treatments,with upgrades in ablation centration and thermal control needed,which will ensure better biomechanical results,as a step closer to perfection in refractive surgery.

关键词： Refractive surgery Excimer laser 6^(th)Generation

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Data Structures in Multi-Objective Evolutionary Algorithms

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Journal of Computer Science & Technology 2012年第6期27卷 1197-1210页

作者： Najwa Altwaijry mohamed el Bachir Menai Department of Computer Science College of Computer and Information SciencesKing Saud UniversityP.O.Box 51178 Riyadh 11453Saudi Arabia

Data structures used for an algorithm can have a great impact on its performance, particularly for the solution of large and complex problems, such as multi-objective optimization problems （MOPs）. Multi-objective evolutionary algorithms （MOEAs） are considered an attractive approach for solving MOPs~ since they are able to explore several parts of the Pareto front simultaneously. The data structures for storing and updating populations and non-dominated solutions （archives） may affect the efficiency of the search process. This article describes data structures used in MOEAs for realizing populations and archives in a comparative way, emphasizing their computational requirements and general applicability reported in the original work.

关键词： multi-objective evolutionary algorithm data structure Pareto front archive population

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An Enhanced Deep Learning Method for Skin Cancer Detection and Classification

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Computers, Materials & Continua 2022年第10期73卷 1109-1123页

作者： mohamed W.Abo el-Soud Tarek Gaber mohamed Tahoun Abdullah Alourani Department of Computer Science and Information College of Science in ZulfiMajmaah UniversityAl-Majmaah11952Saudi Arabia Faculty of Computers and Informatics Suez Canal UniversityIsmailia41522Egypt School of Science Engineeringand EnvironmentUniversity of SalfordUK

The prevalence of melanoma skin cancer has increased in recent *** greatest risk from melanoma is its ability to broadly spread throughout the body by means of lymphatic vessels and ***,the early diagnosis of melanoma is a key factor in improving the prognosis of the *** learning makes it possible to design and develop intelligent systems that can be used in detecting and classifying skin lesions from visible-light *** systems can provide early and accurate diagnoses of melanoma and other types of skin *** paper proposes a new method which can be used for both skin lesion segmentation and classification *** solution makes use of Convolutional neural networks(CNN)with the architecture two-dimensional(Conv2D)using three phases:feature extraction,classification and *** proposed method is mainly designed for skin cancer detection and *** the public dataset International Skin Imaging Collaboration(ISIC),the impact of the proposed segmentation method on the performance of the classification accuracy was *** obtained results showed that the proposed skin cancer detection and classification method had a good performance with an accuracy of 94%,sensitivity of 92%and specificity of 96%.Also comparing with the related work using the same dataset,i.e.,ISIC,showed a better performance of the proposed method.

关键词： Convolution neural networks activation function separable convolution 2D batch normalization max pooling classification

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Mineralogy and radioactivity of pegmatites from South Wadi Khuda area,Eastern Desert,Egypt

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Chinese Journal Of Geochemistry 2010年第4期29卷 343-354页

作者： mohamed F.Raslan mohamed A.Ali mohamed G.el-Feky Nuclear Materials Authority P.O.Box 530El MaadiCairoEgypt

Radioactive minerals in pegmatites associated with granitic rocks are commonly encountered in the south of the Wadi Khuda area and found as dyke-like and small *** are observed within garnet-muscovite granites near the contact with older *** surveys indicated that the studied pegmatites vary in dimensions ranging from 2 to 10 m in width and from 10 to 500 m in *** are composed mainly of intergrowth of milky quartz,reddish-pink K-feldspar and plagioclase together with small pockets of *** radiometric measurements indicated that radioactivity in pegmatites is more than twice that of their enclosing country *** measurements revealed that the average contents of U and Th increase gradually from rocks of dioritic to granodioritic composition(1.5×10-6 U and 4.3×10-6 Th) and increase significantly in biotite granites(5.8×10-6 U and 15.2×10-6 Th) but drastically decrease in muscovite granites(2.2×10-6 U and 5.6×10-6 Th).The average contents of U and Th of anomalous pegmatites are 95.3×10-6 and 116.9×10-6,respectively,indicating their uraniferous *** the south of the Wadi Khuda area,pegmatites are low in average Th/U(1.4) and high in average U/K(35.6),which suggests that uranium concentrating processes did not affect the pegmatites,indicating poor *** investigations of the studied pegmatites revealed the presence of secondary uranium minerals(kasolite and autunite),in addition to zircon,thorite,apatite,garnet and *** and secondary radioactive mineralizations indicated that the mineralization is not only magmatic,but also *** microprobe analyses showed distinct cryptic chemical zoning within thorite where UO2 decreases from core to *** feature in thorite is sporadic,suggesting non-uniform redistributions of UO2 within thorite during magmatic processes.

关键词：放射性核素伟晶岩矿物学黑云母花岗岩平均含量沙漠埃及电子探针分析

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Development of Magnetite/Graphene Oxide Hydrogels from Agricultural Wastes for Water Treatment

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Journal of Renewable Materials 2022年第7期10卷 1889-1909页

作者： Hebat-Allah STohamy mohamed el-Sakhawy Samir Kamel Cellulose and Paper Department National Research CentreCairo12622Egypt

A novel magnetic hydrogel loaded with graphene oxide(GO)was developed in this ***,GO was prepared from bagasse through a single step via oxidation in the presence of ferrocene under muffled atmospheric conditions,followed by the loading of different amounts of magnetite onto GO via co-precipitation reaction of iron onto GO ***,the 2-acrylamido-2-methyl-1-propane sulfonic acid was grafted onto carboxymethyl cellulose in the presence of magnetite GO and N,N′-methylenebisacrylamide as crosslinker yielded *** structure,morphological,and thermal behavior of the prepared hydrogels were *** addition,the adsorption performance of Ni(Ⅱ)ions from aqueous media by the prepared hydrogels was investigated as a function of temperature,time,and concentration of adsorbate in a batch *** results demonstrated a remarkable enhancement in the adsorption process of Ni(Ⅱ)(Removal efficiency=98.82%).All isotherms were found to fit the Langmuir model *** adsorption properties of both magnetic GO and magnetic hydrogel showed promising properties as green and cheap adsorbents.

关键词： Magnetite graphene oxide hydrogel Ni(Ⅱ)adsorption kinetic models thermodynamics

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Potential generated by a massive inhomogeneous straight segment

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Research in Astronomy and Astrophysics 2011年第3期11卷 345-352页

作者： Nour-Eddine Najid el Haj elourabi mohamed Zegoumou Equipe Mécanique Statistique et Astronomie-Laboratoire de Physique Théorique et Appliquée Université Hassan Ⅱ Ain Chock-Faculté des Sciences Ain Chock BP 5366 Maarif Casablanca Morocco

The discoveries of binary asteroids have opened an important new field of research concerning the calculation of potential generated by irregular *** of them have an elongated shape.A simple model to describe the motion of a test particle in that kind of potential requires consideration of a finite homogeneous straight *** construct this model by adding an inhomogeneous distribution of mass. To be consistent with the geometrical shape of the asteroid,we explore a parabolic profile of the *** establish the closed analytical form of the potential generated by this inhomogeneous massive *** study of the dynamical behavior is fulfilled by the use of Lagrangian formulation,which allows us to calculate some two and three dimensional orbits.

关键词： asteroids—potential—inhomogeneous distribution

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Primmorph extracts and mesohyls of marine sponges inhibit proliferation and migration of hepatocellular carcinoma cells in vitro

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Journal of Pharmaceutical Analysis 2019年第4期9卷 284-291页

作者： Hanaa Rady Sohair Salem mohamed Ez el-Arab Chemistry of Natural Compound Department National Research Centre Cairo Egypt Molecular Genetics and Enzymology Department National Research Centre Cairo Egypt National Institute of Oceanography and Fisheries (NIOF) Hurghada Egypt

Cancer recurrence and severe side effects of currently being used chemotherapeutic agents reduce their clinical efficacy. Thus, there is a constant need to develop alternative anticancer drugs. Sustainable supply is an important challenge facing marine-based drug discovery. Primmorph, a 3D cell culture system, could provide a sustainable source to produce metabolites for anticancer drugs from marine sponges. In the present work, the anticancer activity of primmorph extracts and mesohyls of Negombata magnifica, Hemimycle arabica, Crella spinulata, and Stylissa carteri sponges was evaluated. Antiproliferative activity was studied in terms of cytotoxicity, colony formation, cell cycle, and apoptosis. Migration was assessed by migration assay and matrix metalloproteinase activity. The expression of proliferation and migration-related genes was analyzed using real time PCR. Migration and proliferation activities of HepG2 cells were inhibited by treatment with primmorph extracts and mesohyls of N. magnifica, H. arabica, and C. spinulata. The mesohyl of S. carteri did not show any anticancer activity although the primmorph extract led to cell cycle arrest. Among the selected sponge species, the primmorph extract of C. spinulata was the most promising anticancer agent regarding antiproliferative and antimigratory activities. In addition, primmorph extracts have the advantage of working under welldefined and controlled conditions, which allows the easy application as a bioreactor.

关键词： Marine sponge Primmorph Mesohyl Proliferation Migration Hepatocellular carcinoma cell line

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