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Risk factors and prognosis of pediatric rhegmatogenous retinal detachment in Egypt:a university hospital based study

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International Journal of Ophthalmology(English edition) 2023年第12期16卷 2034-2040页

作者： mohamed Gaber eissa Mohamad Amr Salah Eddin Abdelhakim Tamer Ahmed Macky Hassan Aly Mortada Department of Ophthalmology Kasr Al Ainy HospitalFaculty of MedicineCairo UniversityCairo 11431Egypt

AIM:To study and compare the predisposing factors and clinical features of pediatric,adult,and elderly rhegmatogenous retinal detachment(RRD).METHODS:This is an observational analytic crosssectional study in which patients with RRD admitted for surgery during 6mo period were divided into 3 age groups:pediatric(60y).Patients’demographic data,clinical features,RRD predisposing factors/features including myopia(axial length≥26.5 mm),aphakia/pseudophakia,blunt trauma,peripheral retinal degenerations,history of RRD in the fellow eye,and surgical interventions/findings were recorded and ***:Totally 142 patients(142 eyes)were studied:26(18.31%)pediatrics,86(60.56%)adults,and 30(21.13%)*** patients had a significantly higher intraocular pressures and cataracts compared to the other 2 groups(P=0.04).The RRD extent was larger in pediatric group(mostly 4 quadrants)compared to adults and elderly(mostly 2 quadrants),but it was not statistically insignificant(P=0.242).There were not statistically significantly differences in proliferative vitreoretinopathy(PVR)rate,posterior vitreous detachment(PVD)rate,number,site,shape,and size of breaks in three *** three groups had macular detachment in all *** and peripheral retinal degenerations were found to be more significant in adults(P=0.049,P=0.035,respectively),while blunt trauma was higher but insignificant in pediatric eyes(P=0.052).Pars plana vitrectomy(PPV)with silicone oil as a tamponade was the most used surgery in all ***:There are no significant difference in PVR rate in pediatric eyes but a significant higher rate of total *** trauma is more frequent in pediatrics eyes while myopia and/or peripheral retinal degenerations are more frequent in older *** rate of PPV as a choice for surgery is similar among all age groups.

关键词： rhegmatogenous retinal detachment pediatric predisposing factors proliferative vitreoretinopathy peripheral retinal degenerations

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Mid-term results of sub-trochanteric valgus osteotomy for symptomatic late stages Legg-Calvé-Perthes disease

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World Journal of Orthopedics 2023年第5期14卷 328-339页

作者： Khaled M Emara Ramy Ahmed Diab Ahmed K Emara mohamed eissa Mostafa Gemeah Shady Abdelghaffar Mahmoud Department of Orthopedic Surgery Ain Shams UniversityCairo 11591Egypt Department of Orthopedic Surgery Cleveland Clinic FoundationClevelandOH 9500United States Health Care Innovation Program Arizona State UniversityTempeAZ 85287United States

BACKGROUND The treatment of late stages of Legg-Calvé-Perthes disease(LCPD)is *** the concept of femoral head containment is a well-established technique of treatment,its use remains debatable in the late stages of the disease,as it does not improve symptoms in terms of limb length discrepancy and *** To assess the results of subtrochanteric valgus osteotomy in symptomatic patients with late-stage Perthes *** From 2000 to 2007,36 symptomatic patients with late stage of Perthes disease were surgically treated with subtrochanteric valgus osteotomy and followed-up for 8 to 11 years using the IOWA score and range of motion(ROM)*** Mose classification was also assessed at the last follow-up to reflect possible *** patients were 8 years old or older at the time of surgery,in the post-fragmentation stage,and complaining of pain,limited ROM,Trendelenburg gait,and/or abductor *** The preoperative IOWA score(average:53.3)markedly improved at the 1-year post follow-up period(average:85.41)and then slightly improved at the last follow-up(average:89.4)(P value<0.05).ROM improved,with internal rotation increased on average by 22°(from 10°preoperatively to 32°postoperatively)and abduction increased on average by 15.9°(from 25°preoperatively to 41°postoperatively).The mean Mose deviation of femoral heads was 4.1 mm at the end of the follow-up *** tests used were the paired t-test and Pearson correlation test,where the level of significance was a P value less than *** Subtrochanteric valgus osteotomy can be a good option for symptomatic relief in patients with late-stage of LCPD.

关键词： Legg-Calvé-Perthes disease Femoral head avascular necrosis Valgus osteotomy Deformity correction Post fragmentation stage Late stage Perthes

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Role of endoscopic ultrasound in evaluation of patients with missed common bile duct stones

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World Journal of Gastrointestinal Endoscopy 2022年第9期14卷 564-574页

作者： mohamed eissa Hussein Hassan Okasha mohamed Abbasy Ahmed Kamal Khamis Abeer Abdellatef mohamed Akl Rady Department of Hepatology and Gastroenterology National Liver InstituteMenoufia UniversityMenoufia 32951Egypt Department of Internal Medicine Hepatogastroenterology DivisionKasr AL-Ainy School of MedicineCairo UniversityCairo 11451Egypt

BACKGROUND Choledocholithiasis develops in up to 20%of patients with gall bladder *** challenge in diagnosis usually occurs with small stones that may be missed by magnetic resonance cholangiopancreatography(MRCP).Endoscopic ultrasound(EUS)is accurate in detecting common bile duct(CBD)stones missed by MRCP,especially the small ones or those impacted at the distal CBD or the papillary *** To evaluate the accuracy of EUS in detecting CBD stones missed by *** Patients with an intermediate likelihood of choledocholithiasis according to ESGE guidelines and those with acute pancreatitis of undetermined cause were *** presence of choledocholithiasis was evaluated by MRCP and EUS,and then results were confirmed by endoscopic retrograde cholangiopancreatography(ERCP).The sensitivity and specificity of EUS and MRCP were compared regarding the presence of stones,the size,and the number of detected *** Ninety out of 100 involved patients had choledocholithiasis,while ten patients were excluded as they had pancreatic or gall bladder masses during EUS *** choledocholithiasis patients,the mean age was 52.37±14.64 years,and 52.2%were *** patients had biliary obstruction(74.4%),while only 23(25.6%)patients had unexplained *** overall prevalence of choledocholithiasis was 83.3%by EUS,41.1%by MRCP,and 74.4%by ***,the number and size of CBD stones could be detected accurately in 78.2%and 75.6%by EUS and 41.1%and 70.3%by MRCP,*** sensitivity of EUS was higher than that of MRCP(98.51%vs 55.22%),and their predictive value was statistically different(P<0.001).Combination of both tools raised the sensitivity to 97.22%and specificity to 100%.CONCLUSION EUS could be a useful tool in assessing patients with suspected choledocholithiasis especially if combined with ***,its usefulness depends on its availability and the experience of the local centers.

关键词： Magnetic resonance cholangiopancreatography Endoscopic ultrasonography Choledocholithiasis Missed common bile duct stones

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Functional outcome of surgical management of low mid-grade lumbar spondylolisthesis when considering the sagittal balance parameters preoperatively:a prospective study

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Chinese Neurosurgical Journal 2023年第1期9卷 27-38页

作者： Sameh Elmorsy Hassan Elmorsy Hazem Abdelsattar Abulnasr Yousry Hassan Magdy Samra Ehab mohamed eissa Shiekh Zayed Al-nahian Hospital CairoEgypt Neurosurgery Cairo University CairoEgypt

Background:Prospective study objectives.A sagittal balance is a good tool to improve the functional outcome of spine spondylolisthesis surgeries,primarily noted that it has a good impact in deformity surgery and then applied to every spine surgery and the aim of this study is to evaluate its functional outcome when considered in preoperative planning for non-dysplastic low-and mid-grade spondylolisthesis ***:Forty patients diagnosed as low-or mid-grade non-dysplastic spondylolisthesis had undergone surgery at Cairo University after failed medical treatment had been evaluated preoperatively by measuring the sagittal balance parameters which include SVA,spinopelvic angles,lumbar lordosis,pelvic tilt,sacral slope,and pelvic incidence and then measure it along a follow-up period of 1 year postoperatively started from February 2018 and correlate it with functional outcome using Oswestry score(ODI)and *** of parameters has been estimated preoperatively by manual estimation and Surgimap application then applied during the ***:All patients were treated by surgical treatment through posterior transpedicular screw fixation with conventional or reduction screws and fusion±TLIF *** mean of lumbar lordosis and mean spinopelvic angles were increased in a statistically significant *** tilt was decreased in a statistically insignificant *** mean of pelvic incidence was not changed and statistically insignificant,and this is matching the fact that pelvic incidence is a constant *** sacral slope was increased in a statistically insignificant *** results showed that 37 had a statistically significant improvement in their ODI>20%at the last *** patients had a poor clinical outcome with ODI scorFinal results showed that 37 had a statistically significant improvement in their ODI>20%at the last *** patients had a poor clinical outcome with ODI score of>20%improvement,and we noticed that the le

关键词： Spondylolisthesis Low-grade spondylolisthesis Sagittal balance Lumbar lordosis

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Parameters Affecting Energy Consumption for Producing High Carbon Ferromanganese in a Closed Submerged Arc Furnace

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Journal of Iron and Steel Research International 2014年第7期21卷 666-672页

作者： Azza Ahmed Hossam Halfa mohamed K.El-Fawakhry Hoda El-Faramawy Mamdouh eissa Steel Technology Metallurgical Research and Development Institute

The power consumption is considered to be the most important factor affecting the production cost of fer romanganese alloy. Different parameters affecting the energy consumption for industrial production of high carbon ferromanganese HCFeMn were investigated in a closed submerged arc furnace. The analysis of industrial data revealed that the most energy consumed factors were the direct reduction by solid carbon, Boudouard reaction, metal and slag formation, and decomposition of fluxing materials （limestone and dolomite）. To reduce the energy con- sumption and minimize the energy losses in the production process of HCFeMn, it was recommended to use Mn blend with minimum Mn to Fe ratio of 6 and lower SiO2 content or higher basicity. The added coke must be adjusted according to the material balance to prevent the over-coke and to minimize the highly endothermic ＂Boudouard reac tion＂. In addition, it was recommended to work at basic slags with the ratio of （CaO＋MgO） to Si（）2 equal to 1.0- 1.2 instead of much higher slag basicity. Furthermore, the mass losses had to be minimized through adjusting the handling and charging process and to take care of all metal produced.

关键词： high carbon ferromanganese production energy consumption carbonate decomposition Boudouard reaction slag basicity energy loss

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Functionalized CVD monolayer graphene for label-free impedimetric biosensing

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Nano Research 2015年第5期8卷 1698-1709页

作者： Shimaa eissa Gaston Contreras Jimenez Farzaneh Mahvash Abdeladim Guermoune Chaker Tlili Thomas Szkopek Mohammed Zourob mohamed Siaj Institut national de la recherche scientifique Centre - Energie Matefiaux et Telecommunications 1650 BouL Lionel Boulet Varennes (Quebec) J3X 1S2 Canada Departemen t de Chimie et Biochimie Universite du Quebec a Montreal Mon trial Quebec H3C 3P8 Canada Dept. ofElectricaland Computer Engineering McGill University Montreal Quebec H3A 2A7 Canada Cranfield Health Vincent Building Cranfield University Cranfield Bedfordshire UK

Recent advances in large area graphene growth have led to many applications in different areas. In the present study, chemical vapor deposited （CVD） monolayer graphene supported on glass substrate electrochemical biosensing applications was examined as electrode material for We report a facile strategy for covalent functionalization of CVD monolayer graphene by electrochemical reduction of carboxyphenyl diazonium salt prepared in situ in acidic aqueous solution. The carboxyphenyl-modified graphene is characterized using Raman spectroscopy, X-ray photoelectron spectroscopy （XPS）, and atomic force microscopy （AFM）, as well as electrochemical impedance spectroscopy （hIS）. We also show that the number of grafted carboxyphenyl groups on the graphene surface can be controlled by the number of cyclic voltammetry （CV） scans used for electrografting. We further present the fabrication and characterization of an immunosensor based on immobilization of ovalbumin antibody on the graphene surface after the activation of the grafted carboxylic groups via EDC/NHS chemistry. The binding between the surface-immobilized antibodies and ovalbumin was then monitored using Faradaic EIS in [Fe（CN）6]^3-/4- solution. The percentage change of charge transfer resistance （Rct） after binding exhibited a linear dependence for ovalbumin concentrations ranging from 1.0 pg·mL^-1 to 100 ng·mL^-1, with a detection limit of 0.9 pg·mL^-1. Our results indicate good sensitivity of the developed functionalized CVD graphene platform, paving the way for using CVD monolayer graphene in a variety of electrochemical biosensing devices.

关键词： CVD graphene electrochemical impedance spectroscopy Biosensor diazoniumfunctionalization

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Determination of a novel ACE inhibitor in the presence of alkaline and oxidative degradation products using smart spectrophotometric and chemometric methods

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Journal of Pharmaceutical Analysis 2014年第2期4卷 132-143页

作者： Maha Abdel-Monem Hegazy Maya Shaaban eissa Osama Ibrahim Abd El-Sattar mohamed mohamed Abd El-Kawy Analytical Chemistry Department Faculty of PharmacyCairo UniversityCairoEgypt Analytical Chemistry Department Faculty of PharmacyEgyptian Russian UniversityCairoEgypt National Organization of Drug Control and Research GizaEgypt

Simple, accurate, sensitive and validated UV spectrophotometric and chemometric methods were developed for the determination of imidapril hydrochloride （IMD） in the presence of both its alkaline （AKN） and oxidative （OXI） degradation products and in its pharmaceutical formulation. Method A is the fourth derivative spectra （D4） which allows the determination of IMD in the presence of both AKN and OXD, in pure form and in tablets by measuring the peak amplitude at 243.0 nm. Methods B, C and D, manipulating ratio spectra, were also developed. Method B is the double divisor-ratio difference spectrophotometric one （DD-RD） by computing the difference between the amplitudes of IMD ratio spectra at 232 and 256.3 nm. Method C is the double divisor-first derivative of ratio spectra method （DD-DR1） at 243.2 nm, while method D is the mean centering of ratio spectra （MCR） at 288.0 nm. Methods A, B, C and D could successfully determine IMD in a concentration range of 4.0-32.0 mg/mL. Methods E and F are principal component regression （PCR） and partial least-squares （PLS）, respectively, for the simultaneous determination of IMD in the presence of both AKN and OXI, in pure form and in its tablets. The developed methods have the advantage of simultaneous determination of the cited components without any pre-treatment. The accuracy, precision and linearity ranges of the developed methods were determined. The results obtained were statistically compared with those of a reported HPLC method, and there was no significant difference between the proposed methods and the reported method regarding both accuracy and precision.

关键词： Double divisor-ratio difference Double divisor-ratio derivative Mean centering of ratio spectra Chemometry Imidapril hydrochloride

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Moisture dependent physical and mechanical properties of chickpea seeds

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International Journal of Agricultural and Biological Engineering 2010年第4期3卷 80-93页

作者： Ayman H.Amer eissa mohamed M A Moustafa H Abdul Rahman O.Alghannam Department of Agriculture Systems Engineering College of Agricultural and Food SciencesKing Faisal UniversityP.O.Box 420Al-Hassa 31982Saudi Arabia Agriculture Engineering Department Faculty of AgricultureMinoufiya UniversityShibin El-KomEgypt

The moisture-dependent physical properties are important in designing and fabricating equipment and structures for handling,transporting,processing and storage,and also for assessing *** study was carried out to determine the effect of moisture content on some physical and mechanical properties for two varieties of chickpea seeds(Giza 3,and Giza 195).Four levels of moisture content ranging from 11.6%d.b.(dry basis)to 25.4%*** *** average length,width,thickness,and geometric mean diameter ranged from(7.92±0.04)mm to(8.14±0.04)mm,(6.10±0.04)mm to(6.37±0.04)mm,(6.43±0.04)mm to(6.84±0.04)mm and(6.77±0.07)mm to(7.08±0.07)mm,*** average sphericity and roundness ranged from(85.53±0.19)%to(87.00±0.19)%and(93.70±0.35)%to(94.14±0.35)%,*** average measured surface area,calculated surface area,and projected area ranged from(144.73±1.55)mm2 to(158.78±1.55)mm2,(146.89±1.58)mm2 to(159.78±1.58)mm2,and(46.53±0.50)mm2 to(48.93±0.50)mm2,*** average bulk density,true density,porosity and angle of repose ranged from(730.05±11.84)kg/m3 to(694.17±11.84)kg/m3,(1,225.12±19.51)kg/m3 to(1,308.02±19.51)kg/m3,(44.13±0.49)%to(43.29±0.49)%,and(25.20±0.41)o(degrees)to(29.10±0.41)o(degrees),respectively and also increased linearly with an increase in moisture *** average seed weight and thousand seeds weight ranged from(0.142±0.002)gm to(0.184±0.002)gm,and(177.38±2.17)gm to(194.75±2.17)gm,*** average static coefficient of friction against wood,stainless steel,galvanized iron and iron surfaces and internal with the same seeds ranged from(0.430±0.016)to(0.460±0.016),(0.321±0.007)to(0.366±0.007),(0.327±0.004)to(0.371±0.004),(0.412±0.011)to(0.496±0.011)and(0.638±0.022)to(0.741±0.022),*** average terminal velocity ranged from(5.18±0.34)m/s to(9.14±0.34)m/*** average penetration depth at load 6kg and tools diameter 1 mm was determined as mechanical property,and generally increased in magnitude with an increase i

关键词： moisture physical properties mechanical properties chickpea

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The Effect of （x-Radiation Dose on CR-39 Polymer Track Detectors Using Positron Annihilation Lifetime and UV-Spectroscopy

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材料科学与工程（中英文版） 2010年第11期4卷 48-52页

作者： Mostafa Fawzy eissa Esmat mohamed Hassan Emad A. Badawi Physics Department Faculty of Science Beni-Suef University Beni-Suef 62511 Egypt Physics Department Faculty of Science Aswan South rally University Aswan 81528 Egypt Physics Department Faculty of Science EI-Minia University EI-Minia 61519 Egypt

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Quintic B-Spline Method for Solving Sharma Tasso Oliver Equation

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Journal of Applied Mathematics and Physics 2022年第12期10卷 3920-3936页

作者： Talaat S. Eldanaf mohamed Elsayed Mahmoud A. eissa Faisal Ezz-Eldeen Abd Alaal Department of Mathematics and Computer Science Faculty of Science Menoufia University Shebin El-Kom Egypt Basic Science Department School of Engineering Canadian International College “CIC” Giza Egypt Department of Mathematics Faculty of Science Damanhour University Damanhour Egypt

When analysing the thermal conductivity of magnetic fluids, the traditional Sharma-Tasso-Olver (STO) equation is crucial. The Sharma-Tasso-Olive equation’s approximate solution is the primary goal of this work. The quintic B-spline collocation method is used for solving such nonlinear partial differential equations. The developed plan uses the collocation approach and finite difference method to solve the problem under consideration. The given problem is discretized in both time and space directions. Forward difference formula is used for temporal discretization. Collocation method is used for spatial discretization. Additionally, by using Von Neumann stability analysis, it is demonstrated that the devised scheme is stable and convergent with regard to time. Examining two analytical approaches to show the effectiveness and performance of our approximate solution.

关键词： Nonlinear Partial Differential Equations Sharma-Tasso-Olver (STO) Equation Quintic B-Spline Collocation Method Von Neumann Stability Analysis

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