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Hepatic and gastrointestinal disturbances in Egyptian patients infected with coronavirus disease 2019: A multicentre cohort study

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World Journal of Gastroenterology 2021年第40期27卷 6951-6966页

作者： Hend Ibrahim Shousha Shimaa Afify Rabab Maher Noha Asem Eman fouad ehab f mostafa Mohammed A Medhat Amr Abdalazeem Hazem Elmorsy Miriam M Aziz Rateba S Mohammed Mohamed Ibrahem Hassan Elgarem Dalia Omran Mohamed Hassany Bassem Elsayed Ahmed Y Abdelaziz Mohamed El Kassas Endemic Medicine Faculty of MedicineCairo UniversityCairo 11562Egypt Gastroenterology Department National Hepatology&Tropical Medicine Research InstituteCairo 11563Egypt Hepatology Department Students HospitalCairo UniversityGiza 12566Egypt The Public Health Department Faculty of MedicineCairo UniversityCairo 11562Egypt Egyptian Ministry of Health and PopulationCairo 11567Egypt Department of Tropical Medicine and Gastroenterology Faculty of MedicineAssiut UniversityAssiut 15655Egypt Endemic Medicine Department Faculty of MedicineHelwan UniversityCairo 13544Egypt Internal Medicine 15 Mayo Smart HospitalMinistry of Health and PopulationCairo 13488Egypt Pediatrics Department Faculty of MedicineCairo UniversityCairo 11562Egypt Occupational and Environmental Medicine Department Faculty of MedicineCairo UniversityCairo 11562Egypt Clinical Biochemistry Department Faculty of medicineCairo UniversityCairo 11562Egypt Endemic Medicine Department Faculty of MedicineCairo UniversityCairo 11562Egypt Urology Department Cairo UniversityCairo 11562Egypt

BACKGROUND Various liver and gastrointestinal involvements occur in patients with coronavirus disease 2019(COVID-19)at variable *** studies report mild liver function disturbances correlated with COVID-19 severity,though liver failure is *** To study liver and gastrointestinal dysfunctions in Egyptian patients with COVID-19 and their relation to disease outcomes METHODS This multicentre cohort study was conducted on 547 Egyptian patients from April 15,2020 to July 29,*** polymerase chain reaction-confirmed COVID-19 cases were included from four quarantine hospitals affiliated to the Egyptian ministry of *** information,laboratory characteristics,treatments,fibrosis-4(fIB-4)index,COVID-19 severity,and outcomes were recorded and compared according to the degree of liver enzyme elevation and the presence of gastrointestinal ***-ups were conducted until discharge or *** analyses were performed to determine the independent factors affecting *** This study included 547 patients,of whom 53(9.68%)died during hospitalization and 1 was discharged upon his ***’mean age was 45.04±17.61 years,and 21.98%had severe or critical *** aminotransferase(ALT)and aspartate aminotransferase(AST)were available for 430 and 428 patients,*** total,26%and 32%of patients had elevated ALT and AST,*** liver injury with ALT or AST elevation exceeding 3-fold was recorded in 21(4.91%)and 16(3.73%)patients,*** gender,smoking,hypertension,chronic hepatitis C,and lung involvement were associated with elevated AST or *** was elevated in 50%of patients over ***-4 was significantly higher in patients admitted to the intensive care unit(ICU),those with more severe COVID-19,and *** independent variables affecting outcome were supplementary vitamin C intake(1 g daily capsules)[odds ratio(OR):0.05,95%confidence interval(CI

关键词： COVID-19 Egypt Liver injury Gastrointestinal symptoms fibrosis-4 Liver enzymes

MARIE:One-Stage Object Detection Mechanism for Real-Time Identifying of firearms

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 279-298页

作者： Diana Abi-Nader Hassan Harb Ali Jaber Ali Mansour Christophe Osswald Nour mostafa Chamseddine Zaki Computer Science Department Faculty of SciencesLebanese UniversityBeirut146404Lebanon College of Engineering and Technology American University of the Middle EastEgaila54200Kuwait Lab-STICC CNRS UMR 6285ENSTA-BretagneBrest29200France

Security and safety remain paramount concerns for both governments and individuals *** today’s context,the frequency of crimes and terrorist attacks is alarmingly increasing,becoming increasingly intolerable to ***,there is a pressing need for swift identification of potential threats to preemptively alert law enforcement and security forces,thereby preventing potential attacks or violent *** advancements in big data analytics and deep learning have significantly enhanced the capabilities of computer vision in object detection,particularly in identifying *** paper introduces a novel automatic firearm detection surveillance system,utilizing a one-stage detection approach named MARIE(Mechanism for Realtime Identification of firearms).MARIE incorporates the Single Shot Multibox Detector(SSD)model,which has been specifically optimized to balance the speed-accuracy trade-off critical in firearm detection *** SSD model was further refined by integrating MobileNetV2 and InceptionV2 architectures for superior feature extraction *** experimental results demonstrate that this modified SSD configuration provides highly satisfactory performance,surpassing existing methods trained on the same dataset in terms of the critical speedaccuracy *** these innovations,MARIE sets a new standard in surveillance technology,offering a robust solution to enhance public safety effectively.

关键词： firearm and gun detection single shot multi-box detector deep learning one-stage detector MobileNet inception convolutional neural network

Experimental study on microwave pyrolysis of eucalyptus camaldulensis leaves:a promising approach for bio-oil recovery

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frontiers of Chemical Science and Engineering 2024年第10期18卷 83-94页

作者： Muhammad Kashif faizan Ahmad Weitao Cao Wenke Zhao ehab mostafa Yaning Zhang School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China faculty of Agriculture Cairo UniversityGiza 12613Egypt

Eucalyptus species are extensively cultivated trees commonly used for timber production,firewood,paper manufacturing,and essential nutrient extraction,while lacking consumption of the leaves increases soil *** objective of this study was to recover bio-oil through microwave pyrolysis of eucalyptus camaldulensis *** effects of microwave power(450,550,650,750,and 850 W),pyrolysis temperature(500,550,600,650,and 700°C),and silicon carbide amount(10,25,40,55,and 70 g)on the products yields and bio-oil constituents were *** yields of bio-oil,gas,and residue varied within the ranges of 19.8–39.25,33.75–46.7,and 26.0–33.5 wt%,*** optimal bio-oil yield of 39.25 wt%was achieved at 650 W,600°C,and 40 *** oxygenated derivatives,aromatic compounds,aliphatic hydrocarbons,and phenols constituted 40.24–74.25,3.25–23.19,0.3–9.77,and 1.58–7.75 area%of the bio-oils,*** acid(8.17–38.18 area%)was identified as a major bio-oil constituent,and hydrocarbons with carbon numbers C_(1) and C_(2) were found to be *** experimental results demonstrate the potential of microwave pyrolysis as an eco-friendly and efficient way for converting eucalyptus waste into valuable bio-oil,contributing to the sustainable utilization of biomass resources.

关键词： sbio-oil recovery eucalyptus leaves microwave pyrolysis

Effect of functionalized Multi-walled Carbon Nanotubes with Poly(N-vinyl pyrrolidone-co-2-acrylamido-2-methyl-1-propanesulfonic acid) on the Release of Tramadol Hydrochloride

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Chinese Journal of Polymer Science 2015年第3期33卷 376-385页

作者： Ahmed Awadallah-f Tahia B.mostafa National Center for Radiation Research and Technology Chemistry Department University College for WomenAin Shams University

Multi-walled carbon nanotubes （MWCNTs） were grafted with poly（N-vinyl-2-pyrrolidone） and with poly（2- acrylamido-2-methyl-1-propanesulfonic acid） at different compositions by using y-rays technique as initiator. The MWCNTs, MWCNT-graft-PNVP, MWCNT-graft-PAMPS and MWCNTs-graft-P（NVP-co-AMPS） were characterized by fourier transform infra red （fTIR） spectroscopy, X-ray diffraction （XRD）, thermal gravimetric analysis （TGA）, elemental analysis and high-resolution transmission electron microscopy （HR-TEM）. The results indicated that the grafting processes of PNVP, PAMPS and P（NVP-co-AMPS） occurred on to the surfaces of MWCNTs without destroying the framework of MWCNTs. Tramadol hydrochloride （TH） was loaded as model drug and its release behavior was analyzed via various kinetic models. Release of the loaded TH was studied in simulated gastric fluid （SGf, pH = 1.2） and simulated intestinal fluid （SIf, pH = 7.4） at 37 ℃. Controlled release of TH from grafted MWCNTs was investigated. The outcome results suggest that the grafted MWCNTs could be used as a promising matrix candidate for oral drug delivery system by harmonization between the composition and pH level of the simulated biological fluids.

关键词： Polymer grafting Gamma irradiation Multi-walled carbon nanotubes Controlled release Tramdol hydrochloride.

Chemical stability, thermal behavior, and shelf life assessment of extruded modified double-base propellants

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Defence Technology（防务技术） 2018年第1期14卷 70-76页

作者： Sherif Elbasuney Ahmed fahd Hosam E.mostafa Sherif f.mostafa Ramy Sadek School of Chemical Engineering Military Technical College

Double base propellant suffers from lack of chemical stability; this could result in self ignition during storing. Modified double base(MDB) propellant based on stoichiometric binary mixture of oxidizermetal fuel(Ammonium perchlorate/Aluminum), and energetic nitramines(HMX) offered enhanced thrust as well as combustion characteristics. This study is devoted to evaluate the impact of such energetic additives on thermal behavior, chemical stability, and shelf life. Extruded MDB formulations were manufactured by extrusion process. Artificial aging at 80℃ for 28 days was conducted. Shelf life assessment was performed using Van't Hoff's equation. Quantification of evolved NOxgases with aging time was performed using quantitative stability tests. MDB formulation based on HMX demonstrated extended service life of 16 years compared with(AP/Al)-MDB which demonstrated 9 years. This finding was ascribed to the reactivity of AP with nitroglycerin with the formation of perchloric acid. Thermal behavior of aged MDB, exhibited an increase in heat released with time; this was ascribed to the autocatalytic thermal degradation during artificial aging. The increase in released heat by 31% was found to be equivalent to evolved NOx gases of 6.2 cm^3/5 g and 2.5 cm^3/1 g for Bergmann-Junk test, and Vacuum stability test respectively. This manuscript shaded the light on a novel approach to quantify evolved NOx gases to heat released with aging time. MDB based on HMX offered balanced ballistic performance,chemical stability, and service life.

关键词： Double-base Chemical stability Thermal behavior Artificial aging Shelf life assessment

Simple and sensitive method for the determination of trace amounts of thorium using a benzoquinone derivative

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Nuclear Science and Techniques 2019年第5期30卷 22-31页

作者： mostafa M.Hamed Refaat f.Aglan Hot Laboratories and Waste Management Center Atomic Energy Authority of Egypt

A novel simple, sensitive, rapid, direct, and spectrophotometry-based procedure was investigated to determine Th(IV) at trace amounts. The new method is based on Th(IV) chelation with 3,6-dichloro-2,5-dihydroxy-l,4-benzoquinone(DDBQ). The reagent reacts with Th(IV) in 0.1 M HCl to form an orange 1:2 complex. The stability constant value is 6.62×10~4 for the Th(IV)complex. The Th(IV)-DDBQ obtained shows one peak with a maximum at about 346 nm. The chelate forms immediately and the absorbance remains stable for over24 h. Beer's law was obeyed in the concentration range0–10 μg mL^(-1). The molar absorptivity and Sandell's sensitivity were 4.4×10~4 L mol^(-1)cm^(-1) and 0.0053 μg cm^(-2), respectively. Different analytical parameters were tested in detail. Interfering ion(cations and anions) effects were tested. Methods for Th(IV) determination by second and third-derivative spectrophotometry were also introduced at about 344 and 341 nm, respectively. These two derivative orders offer the feature of sensitivity without the necessity for solvent extraction,heating, or pre-concentration steps. finally, the methods were successfully utilized for Th(IV) determination in monazite, environmental water, and wastewater samples.

关键词： Th(IV) determination p-benzoquinone derivative Spectrophotometry

Molecular study on Y chromosome microdeletions in Egyptian males with idiopathic infertility

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Asian Journal of Andrology 2004年第1期6卷 53-57页

作者： mostafa K. El Awady Sohair f. El Shater ehab Ragaa Khaled Atef Ibrahim M. Shaheen Nagwa A. Megiud Department of Biomedical Technology Children with Special Needs National Research Center Dokki Cairo 12622 Egypt Department of Research on Children with Special Needs National Research Center Dokki Cairo 12622 Egypt Department of Dermatology Venereology and Andrology Faculty of Medicine Al-Azhar University Cairo Egypt

Aim: To determine the frequency of genetic deletions within the azoospermia factors in Egyptian infertile males. Methods: The Yq microdeletions in 33 infertile males with undetectable chromosomal anomalies were examined by mutiplex polymerase chain reaction (PCR). Deletions were confirmed using single PCR amplifications. Results: four out of the total 33 (12 %) men had Yq11 microdeletions, thus supporting the average reported figures in other populations. Three of those 4 cases had single short tandem sequence deletions with discrete histological findings of their testes. Single sY272 deletion within AZfc was associated with Sertoli cell only syndrome, whereas a patient with isolated sY84 deletion within AZfa had immature testicular structure. The remaining case had a large deletion in AZfa-c and short stature. Conclusion: The present study supports the hypothesis that the Yqn encompasses genetic determinants of stature besides genes controlling spermatogenesis.

关键词： AZf Y microdeletions multiplex polymerase chain reaction male infertility azoospermia

Catalytic behaviors of Co-Mn/TiO_2 catalysts for fischer-Tropsch synthesis

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燃料化学学报 2012年第12期40卷 1435-1443页

作者： mostafa feyzi faculty of Chemistry Razi UniversityKermanshahIran

The 15%(Co-Mn)/TiO2,(Co/Mn=1/6) catalyst was prepared using fusion procedure and studied for the conversion of synthesis gas to C2 ～ 4 *** effects of calcination conditions and operation conditions such as the H 2 / CO molar feed ratio at different temperatures,gas hourly space velocity(GHSV) and total reaction pressure on the catalytic performance of catalyst were *** stability of the catalyst during 150 h at optimal operation conditions(t = 250℃ H2 /CO= 2/1,GHSV=1 500 h-1 and p =0.3 MPa) has been *** is found that this catalyst is high stable for production C2 ～ 4 *** of both precursors and calcined catalysts by powder X-ray diffraction,scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET) specific surface area measurement and thermal analysis methods such as thermal gravimetric analysis(TGA) and differential scanning calorimetry(DSC) show that the different preparation method influences the catalyst precursor structure and morphology.

关键词：气化理论燃料化学研究发展

Nonclassical Symmetries for Nonlinear Partial Differential Equations via Compatibility

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Communications in Theoretical Physics 2011年第10期56卷 611-616页

作者： mostafa f.El-Sabbagh Ahmad T.Ali Mathematics Department Faculty of ScienceMinia UniversityMiniaEgypt King Abdul Aziz University Faculty of ScienceDepartment of MathematicsP.O.Box 80203Jeddah21589Saudi Arabia

The determining equations for the nonclassical symmetry reductions of nonlinear partial differential equations with arbitrary order can be obtained by requiring the compatibility between the original equations and the invariant surface conditions. The （2＋1）-dimensional shallow water wave equation, Boussinesq equation, and the dispersive wave equations in shallow water serve as examples i11ustrating how compatibility leads quickly and easily to the determining equations for their nonclassical symmetries.

关键词： nonclassical symmetriesm compatibility (2+ 1)-dimensional shallow water wave Boussinesq equa-tions and the dispersive wave equations in shallow water