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Predictors of graft function and survival in second kidney transplantation: A single center experience

World Journal of Transplantation 2023年第6期13卷 331-343页

作者： Mahmoud Khalil Rabea ahmed Gadelkareem medhat ahmed abdallah Mohamed Abdel-Basir Sayed FathyGaber Elanany Paolo Fornara Nasreldin Mohammed Department of Urology Assiut Urology and Nephrology HospitalFaculty of MedicineAssiut UniversityAssiut 71515AssiutEgypt Department of Urology and Kidney Transplantation Martin Luther UniversityHalle(Saale)71515Germany

BACKGROUND The increasing kidney retransplantation rate has created a parallel field of research,including the risk factors and outcomes of this advanced form of renal replacement *** presentation of experiences from different kidney transplantation centers may help enrich the literature on kidney retransplantation,as a specific topic in the field of kidney *** To identify the risk factors affecting primary graft function and graft survival rates after second kidney transplantation(SKT).METHODS The records of SKT cases performed between January 1977 and December 2014 at a European tertiary-level kidney transplantation center were retrospectively reviewed and *** the descriptive characteristics,the survivals of patients and both the first and second grafts were described using Kaplan-Meier *** addition,Kaplan-Meier analyses were also used to estimate the survival probabilities at 1,3,5,and 10 post-operative years,as well as at the longest followup duration ***,bivariate associations between various predictors and the categorical outcomes were assessed,using the suitable biostatistical tests,according to the predictor *** Out of 1861 cases of kidney transplantation,only 48 cases with SKT were eligible for studying,including 33 men and 15 women with a mean age of 42.1±13 *** primary non-function(PNF)graft occurred in five patients(10.4%).In bivariate analyses,a high body mass index(P=0.009)and first graft loss due to acute rejection(P=0.025)were the only significant predictors of PNF *** second graft survival was reduced by delayed graft function in the first(P=0.008)and second(P<0.001)***,the effect of acute rejection within the first year after the first transplant did not reach the threshold of significance(P=0.053).The mean follow-up period was 59.8±48.6 *** graft/patient survival rates at 1,3,5 and 10 years were 90.5%/97.9%,79.9%/95.6%,73.7%/91.9%,and 51.6%/83.0%,respe

关键词： Graft failure Graft function Kidney Kidney retransplantation Primary non-function graft Second kidney transplantation

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Magnetoresistive properties of Ni-doped La_(0.7)Sr_(0.3)MnO_3 manganites

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Rare Metals 2016年第7期35卷 551-558页

作者： ahmed Mohamed ahmed Abd El-Moez ahmed Mohamed medhat Abdelrady Abdellateef Hassan ahmed Abd El-Ghanny Physics Department Faculty of ScienceSohag University

Lao.7Sr0.3Mnl_xNixO3 （x = 0, 0.025, 0.050 and 0.075） ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni2＋ leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni2＋ doping increases the electrical resistivity, decreases the semiconductor-metal transition temperature （Tms） and relatively enhances the room temperature magnetoresistance （MR）, especially in x = 0.025 and around Tins. With respect to conduction mechanism, the small polaron hopping （SPH） and the variable range hopping （VRH） models were used to ex- amine conduction in the semiconducting region.

关键词： Manganites X-ray diffraction Structure Electrical resistivity Magnetoresistance

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Ecological risk assessment of surficial sediment by heavy metals from a submerged archaeology harbor,South Mediterranean Sea,Egypt

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Acta Geochimica 2020年第2期39卷 226-235页

作者： Maha ahmed Mohamed abdallah ahmed Mohamed Badr-ElDin Marine Pollution Lab National Institute of Oceanography and FisheriesAlexandriaEgypt Oceanography Department Faculty of ScienceAlexandria UniversityAlexandriaEgypt

A protected semi-enclosed embayment,the Eastern Harbor(EH),is situated in the central sector of the Mediterranean coast of Alexandria,*** is a famous fishing dock and water-sport center and its importance arose after the discovery of the Ptolemaic royal quarter of ancient *** protect this national treasure and improve its environmental health,the untreated anthropogenic effluents,which continued for decades into the EH since 1992,must be totally ***,it is an important issue to continually monitor and asses the environmental status of the *** sediment texture,total organic carbon,and the accumulation,distribution,and ecological risks of Cd,Cr,Pb,As,Hg and A1 were determined with a total of 14 surficial sediments samples collected in the EH during *** contents were compared to the literature data to assess the pollution status of *** factors,Degree of contamination(mCd)and potential ecological risk were calculated as a criterion of possible *** mCd calculation produces an overall average value for a range of pollutants,in the present study the contamination factor that provides a measure of the degree of overall contamination in the surface layers in a particular sampling site may provide a better indication of the state of pollution in the EH sediments than other indicators.

关键词： Heavy metals Eastern harbor Enrichment factors Degree of contamination Potential ecological risk

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DECAY ESTIMATES FOR ISENTROPIC COMPRESSIBLE MAGNETOHYDRODYNAMIC EQUATIONS IN BOUNDED DOMAIN

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Acta Mathematica Scientia 2012年第6期32卷 2211-2220页

作者： Mohamed ahmed abdallah 江飞谭忠 School of Mathematical Sciences Xiamen University College of Mathematics and Computer Science Fuzhou University Institute of Applied Physics and Computational Mathematics

In this paper, under the hypothesis that y is upper bounded, we construct a Lyapunov functional for the multidimensional isentropic compressible magnetohydrodynamic equations and show that the weak solutions decay exponentially to the equilibrium state in L2 norm. Our result verifies that the method of Daoyuan Fang, Ruizhao Zi and Ting Zhang I1] can be adapted to magnetohydrodynamic equations.

关键词： Navier-Stokes equations weak solution decay estimates magnetohydrody-namic

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Germination and Photosynthetic Responses to Salinity and Alkalinity in Avicenna marina Propagules

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Phyton-International Journal of Experimental Botany 2022年第5期91卷 1015-1026页

作者： abdallah Atia ahmed abdallah Hussain Barhoumi Zouhaier Department of Biology College of Arts and Science Mahayel AsirKing Khalid UniversityAbha61413Saudi Arabia Research Unit Nutrition and Nitrogen Metabolism and Stress ProteinDepartment of BiologyFaculty of Sciences of TunisCampus Universitaire El Manar ITunis1068Tunisia Department of Biology King Khalid UniversityAbha61413Saudi Arabia Faculty of Science Abu HarazGezira UniversityWed Medani21111Sudan Laboratory of Extremophile Plants Biotechnology Center of Borj CedriaUniversity Tunis El ManarTunis1068Tunisia

Avicenna marina(Forssk.)Vierh is a halophytic *** reproductive unit is green and has photosynthetic *** are naturally exposed to fluctuations in some abiotic factors at the soil surface,including salinity and *** objective of this study was to determine the effects of two salts including NaCl and NaHCO_(3)on germination processes and discuss the relationships between cotyledon photosynthesis and embryo axis growth in *** *** propagules came from Al Birk,located on the shoreline of the Saudi Red *** results showed that the studied salts did not affect neither the final germination percentage nor the embryo axis ***,rooting and root growth were delayed by both salts at 300 mM and were strongly inhibited by 600 mM NaHCO_(3).Both NaCl and NaHCO_(3)reduced the photosynthetic *** two salts did not affect the other photosynthetic parameters,including stomatal conductance,net transpiration,and intercellular CO_(2).Thereafter,the reduction in net photosynthesis was not related to any limitation of stomatal *** early germination phase was independent of cotyledon photosynthesis,whereas rooting and root growth may be limited by reduced photosynthesis under NaCl and NaHCO_(3).

关键词： Avicenna marina propagules cotyledons embryo growth germination photosynthesis alkalinity salinity

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Exponential Attractor for a Nonlinear Boussinesq Equation

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Acta Mathematicae Applicatae Sinica 2006年第3期22卷 443-450页

作者： ahmed Y. abdallah Departmcnt of Mathematics University of Jordan Amman 11942 Jordan

This paper is devoted to prove the existence of an exponential attractor for the semiflow generated by a nonlinear Boussinesq equation. We formulate the Boussinesq equation as an abstract equation in the Hilbert space H0^2（0, 1） × L^2（0, 1）. The main step in this research is to show that there exists an absorbing set for the solution semiflow in the Hilbert space H0^3（0, 1） × H0^1（0, 1）.

关键词： Boussinesq equation absorbing set exponential attractor

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Spectrum behavior for the nonlinear fractional point reactor kinetics model

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Nuclear Science and Techniques 2018年第1期29卷 96-109页

作者： ahmed E.Aboanber abdallah A.Nahla A.A.Hemeda Department of Mathematics Faculty of Science Tanta University

The nonlinear fractional point reactor kinetics equation in the presence of Newtonian temperature reactivity feedback with a multi-group of delayed neutrons,which describes the spectrum behavior of neutron density into the homogenous nuclear reactors, is developed. This system is one of the most important stiff coupled nonlinear fractional differentials for nuclear reactor dynamics. The generalization of Taylor's formula that involves Caputo fractional derivatives is developed in an attempt to overcome the difficulty of the stiffness of the nonlinear fractional differential model. Moreover, the general fractional derivatives are calculated analytically throughout this work. Furthermore, the local and global estimated errors were analyzed, which suggest that the error quantification should take into account the possible grow in time of the error. This observation provides a motivation for going beyond more classical local-in-time concepts of error(local truncation error). The neutron density response with time is analyzed for the anomalous diffusion, sub-diffusion, and super-diffusion processes.

关键词： Nonlinear fractional Generalized Taylor’s formula Point kinetics Multi-group delayed neutrons Temperature feedback reactivity

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Developed mathematical technique for fractional stochastic point kinetics model in nuclear reactor dynamics

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Nuclear Science and Techniques 2018年第9期29卷 197-213页

作者： ahmed E.Aboanber abdallah A.Nahla Adel M.Edress Department of Mathematics Faculty of Science Taibah University Department of Mathematics Faculty of Science Tanta University

Fractional stochastic kinetics equations have proven to be valuable tools for the point reactor kinetics model, where the nuclear reactions are not fully described by deterministic relations. A fractional stochastic model for the point kinetics system with multi-group of precursors,including the effect of temperature feedback, has been developed and analyzed. A major mathematical and inflexible scheme to the point kinetics model is obtained by merging the fractional and stochastic technique. A novel split-step method including mathematical tools of the Laplace transforms, Mittage–Leffler function, eigenvalues of the coefficient matrix, and its corresponding eigenvectors have been used for the fractional stochastic matrix differential equation. The validity of the proposed technique has been demonstrated via calculations of the mean and standard deviation of neutrons and precursor populations for various reactivities: step, ramp, sinusoidal, and temperature reactivity feedback. The results of the proposed method agree well with the conventional one of the deterministic point kinetics equations.

关键词： Ito stochastic point kinetics equations Temperature feedback effects Wiener process Fractional calculus Mittage–Leffler function

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Preparation of PVC/PVP composite polymer membranes via phase inversion process for water treatment purposes

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Chinese Journal of Chemical Engineering 2018年第4期26卷 715-722页

作者： ahmed Bhran Abeer Shoaib Doaa Elsadeq Ayman El-gendi Heba abdallah Chemical Engineering Department College of Engineering Al Imam Mohammad Ibn Saud Islamic University (IMSIU) Department of Petroleum Refining and Petrochemical Engineering Faculty of Petroleum and Mining Engineering Suez University Chemical Engineering and Pilot Plant Department Engineering Research Division National Research Centre Chemical and Materials Engineering Department King Abdulaziz University

In this work, new composite membranes were successfully prepared via phase inversion technique using polyvinyl chloride(PVC) and polyvinylpyrrolidone(PVP) as polymers and tetrahydrofuran(THF) and N-methyl-2-pyrrolidone(NMP) as solvents. The prepared membranes have been characterized by scanning electron microscope(SEM), and fourier transforms infrared spectroscopy(FTIR). The scanning electron microscope results prove that the prepared membranes are smooth and their pores are distributed throughout the whole surface and bulk body of the membrane without any visible cracks. The stress–strain mechanical test showed an excellent mechanical behavior enhanced by the presence of PVP in the prepared membranes. The membranes performance results showed that the salt rejection reached 98% with a high flux. This, in turn, makes the prepared membranes can be applied for sea and brackish water treatment through membrane distillation technology.

关键词： Membrane Polyvinylchloride Polyvinylpyrrolidone Phase inversion

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Mercury speciation in aquatic environment south eastern coast of the Mediterranean Sea,Egypt

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Emerging Contaminants 2020年第1期6卷 194-203页

作者： Maha ahmed Mohamed abdallah Marine Pollution Lab National Institute of Oceanography&FisheriesAlexandriaEgypt

This study aims to describe distribution and speciation of Hg in coastal water,fish and sediments from the Western harbour(main harbour)in Egypt and has been studied in two *** slightly high annual mean of total dissolved mercury TDHg value(1.81 mg/L)in the surface layer might reflect the highest average surface value(6.09 mg/L),selected at the outer part,due to the entering the water loaded by industrial pollutants from El Mex Bay to the harbour *** addition to the internal activities as petroleum Quay(petroleum basin)and in front of Noubaria Canal outfall(5.13 and 5.32 mg/L respectively).On the other hand,the increased levels of mercury in suspension(particulate form)during the study period may be due to the effects of heavy winter rain over the highly industrialized area,also the surface input of mercury and its regeneration at the sediment/water interface in the *** the present study,the total and methyl mercury in the studied fish was exceeded the regulatory limit of the European Union for mercury concentration in *** contamination of *** species was higher than that of the other studied species due to its habitat,represented by small schools in very shallow water close to the bottom sediments,and its different approach in *** present study of surface sediments reveals that,there were probably an uncomplexed strong Hg-binding site available in the sediments,the major portion of mercury found in these sediments is in organo-chelated form followed by acid reducible ***,mercury in residual fraction(mercury of natural origin)is the relatively low portion *** though the percentage of the first three fractions of mercury is relatively high,absolute values of these mobile Hg fractions are quite high due to the high total mercury values.

关键词： Mercury Water Sediments Fish Mediterranean sea Egypt

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