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Phytochemical and biological studies of Butia capitata *** cultivated in Egypt

Asian Pacific Journal of Tropical Biomedicine 2014年第6期4卷 456-462页

作者： nagwa mohamed ammar Mohammed Said Hefnawy Sahar Youssef Al-Okbi Doha Abdou mohamed Nabil Khamis El-Sayed Amira Ahmed El-Anssary Tom Mabry Pharmacognosy Department National Research Centre Pharmacognosy Department Faculty of PharmacyCairo University Food Sciences and Nutrition Department National Research Centre Tanning Materials and Protein Chemistry National Research Centre Molecular Cell and Developmental Biology The School of Biological ScienceBotany DepartmentTaxas State University

Objective:To study the antioxidant and anti-inflammatory activity of Butia capitata(***)leaf extracts along with phytochemical analysis of the proposed bioactive ***:Different successive extracts of *** *** were prepared with selective organic solvents and screened for their anti-inflammatory activities in tested animals and invitro antioxidant *** extensive phytochemical investigation of the bioactive extracts through paper chromatography,thin layer chromatography,column chromatography,gasliquid chromatography(GLC),high pressure liquid chromatography and spectral ***,ultraviolet,hydrogen and carbon nuclear magnetic resonance,electron ionization-mass spectrometry,heteronuclear multiple bond correlation and heteronuclear multiple quantum correlation were carried out Results:Results showed that different extracts possess promising antioxidant effect and significant anti-inflammatory activity with variable *** results of the phytochemical investigation of the bioactive extracts revealed the presence of volatile substances,lipoidal matter,α-tocopherol,free sugars,polysaccharides and flavonoidal ***:*** leaf extracts were shown to possess variable antioxidant effect,the most promising was methanol extract Both polar and non polar extracts were proved to have anti-inflammatory activity,the non polar extract was superior in this respect The bioactivity of the extracts was ascribed to the presence of flavonoids,sterols andα-tocopherol.

关键词： Butia capitata leaves antioxidant effect anti-inflammatory activity bioactive constituents rats.

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Toxoplasma gondii infection can induce retinal DNA damage: an experimental study

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International Journal of Ophthalmology(English edition) 2014年第3期7卷 431-436页

作者： nagwa Mostafa El-Sayed Eman mohamed Aly Department of Medical Parasitology Research Institute of Ophthalmology Department of Basic Science Biophysics and Laser Science Unit Research Institute of Ophthalmology

AIM:To detect whether Toxoplasma gondii(***)infection of mice can induce retinal DNA ***:A total of 20 laboratory-bred male Swiss albino mice were used and divided into four groups:control group(non-infected animals);*** infected group;immunosuppressed infected group;and infected group treated with sulfadiazine and *** eyes were collected 6wk post infection and retinas were *** retina was immediately processed for comet assay and the frequency of tailed nuclei(DNA damage)was *** addition,retinal DNA damage was revealed by various comet assay parameters that were provided by the image analysis software including tail length,percentage of DNA in the tail,percentage of tailed cells and tail ***:The obtained results showed that *** infection induced a statistically significant increase in the frequency of tailed nuclei,tail length,percentage of DNA in the tail,and tail moment in mice retinal cells compared to the control group(which showed some degree of DNA damage).In immunosuppressed infected group,retinal DNA damage was severing and there was significant increase in various comet assay parameters compared to both control and infected *** treatment with sulfadiazine and pyrimethamine,retinal DNA damage decreased and all comet assay parameters showed a statistical significant decrease compared to infected ***:*** infection can induce DNA damage in mice retinal cells.

关键词： Toxoplasma gondii retinochoroiditis DNA damage comet assay

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Entropy generation of MHD natural convection heat transfer in a heated incinerator using hybrid-nanoliquid

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Propulsion and Power Research 2021年第2期10卷 143-154页

作者： Bouchmel Mliki mohamed ammar Abbassi Materials Energy and Renewable EnergiesFaculty of Sciences of GafsaB.P.19ZarrougGafsa2112Tunisia

The present study explores magnetic hybrid-nanoliquid(Al_(2)O_(3)-Cu/H_(2)O)natural convection in a heated incinerator shaped cavity by using the lattice Boltzmann method(LBM).Numerical results are presented in the form temperature contours,stream function and local entropy *** interaction between various physical phenomena characterizing this problem including the natural convection and the magnetic field has been *** of Rayleigh number(Ra=10^(3)-10^(6)),volumetric fraction of nanoparticles(ϕ=0-0.04),and Hartmann number(Ha=0-90)are clarified in details through graphical *** depict that the average Nusselt number(Nu_(m))and average entropy generation(S_(gen,A))increases with an increase of the Rayleigh number while are decreased by applying a magnetic *** addition,it is found that the average Nusselt number(Nu_(m))increases with the rise of volumetric fraction of nanoparticles for all Rayleigh and Hartmann ***,an opposite effect is obtained by an increase in volumetric fraction of nanoparticles on the average entropy generation(S_(gen,A)).Finally,the numerical results demonstrate that the effect of Lorentz force is reduced when the heat transfer regime conduction is considered.

关键词： Incinerator Entropy generation Natural convection Hybrid-nanoliquid Magnetohydrodynamic(MHD)

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Analysis and Control of the Vehicle Roll Dynamics Using Sum of Squares Polynomial Approach

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Journal of Systems Science & Complexity 2024年第6期37卷 2318-2346页

作者： IBEN ammar Imen DOUMIATI Moustapha TALJ Reine CHOKOR Abbas MACHMOUM mohamed ESEO-IREENA 10 Bd Jeanneteau-CS 90717Angers49107France Institut de Recherche en Energie Electrique de Nantes Atlantique IREENA UR 464237 Boulevard de l'Universite-BP406Saint-NazaireF-44602France Sorbonne Universités Universite de Technologie de CompiegneCNRSHeudiasyc UMR 7253CS 6031960203 CompiegneFrance Continental 17 Rue Paulin Talabot31100 ToulouseFrance

The safety of vehicle travel relies on good stability performance,making vehicle motion control a vital technology in *** paper focuses on investigating the impact of roll control on vehicle performance,particularly in terms of avoiding rollover and ensuring lateral *** introducing a feedback roll moment,the roll motion can be effectively *** paper considers two roll reference generators:A static one aimed at zero roll,and a dynamic one based on the vehicle's lateral *** static roll reference generator enhances stability by employing a fixed reference,particularly beneficial during routine driving *** contrast,the dynamic roll reference generator continually adapts the roll angle reference in response to real-time vehicle dynamics and driving *** proposed reference generators can be paired with varying suspension systems—Static reference could be achieved using semi-active suspensions,while the dynamic one is integrated into advanced active suspension systems,offering heightened adaptability and *** address the roll control objectives,this paper proposes a novel sum of squares(SOS)integral polynomial tracking *** proposed controller satisfies control bounds and considers control constraints during the design *** effectiveness and robustness of the proposed control scheme are evaluated through numerical simulations using a full vehicle nonlinear model in Matlab/*** results of these simulations are compared to super-twisting sliding mode and Lyapunov-based controllers.

关键词： Active suspensions lateral stability polynomial control rollover avoidance SOS approach

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TiO_2–PANI/Cork composite: A new floating photocatalyst for the treatment of organic pollutants under sunlight irradiation

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Journal of Environmental Sciences 2017年第10期29卷 3-13页

作者： Mouheb Sboui mohamed Faouzi Nsib Ali Rayes Meenakshisundaram Swaminathan ammar Houas Laboratory CI-Sfax Faculty of Science University of Sfax URCMEP (UR11ES85) Faculty of Sciences University of Gabès National School of Engineers (ENIG) University of Gabès High School of Sciences and Technology of Hammam Sousse University of Sousse Nanomaterials Laboratory International Research Centre Kalasalingam University Al Imam Mohammad Ibn Saud Islamic University (IMSIU) College of Sciences Department of Chemistry

A novel photocatalyst based on TiO2-PANI composite supported on small pieces of cork has been reported. It was prepared by simple impregnation method of the polyaniline（PANI）-modified TiO2 on cork. The TiO2-PANI/Cork catalyst shows the unique feature of floating on the water surface. The as-synthesized catalyst was characterized by X-ray diffraction（XRD）,scanning electron micrograph（SEM）, transmission electron microscopy（TEM）, thermogravimetric analysis（TGA）, Fourier transform infrared spectroscopy（FT-IR）, UV-vis diffuse reflectance spectra（UV-vis DRS） and the Brunauer-Emmett-Teller（BET） surface area analysis. Characterization suggested the formation of anatase highly dispersed on the cork surface. The prepared floating photocatalyst showed high efficiency for the degradation of methyl orange dye and other organic pollutants under solar irradiation and constrained conditions, i.e., no-stirring and no-oxygenation. The TiO2-PANI/Cork floating photocatalyst can be reused for at least four consecutive times without significant decrease of the degradation efficiency.

关键词： TiO2 Polyaniline Cork Floating catalyst Photodegradation Solar light

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Acousto-optically driven lensless single-shot ultrafast optical imaging

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Light(Science & Applications) 2022年第4期11卷 628-643页

作者： mohamed Touil Said Idlahcen Rezki Becheker Denis Lebrun Claude Roze ammar Hideur Thomas Godin ORIA CNRS UMR6614-University de Rouen Normandie-INSA Rouen76800 Saint Etienne du RouvrayFrance

Driven by many applications in a wide span of scientifc fields,a myriad of advanced ultrafast imaging techniques have emerged in the last decade,featuring record-high imaging speeds above a trllion-frame-per-second with long sequence *** bringing remarkable insights into various ultrafast phenomena,their application out of a laboratory environment is however limited in most cases,either by the cost,complexity of the operation or by heavy data *** then report a versatile single-shot imaging technique combining sequentially timed lloptical mapping photography(STAMP)with acousto-optics programmable dispersive fhItering(AOPDF)and digital in-line holography(DIH).On the one hand,a high degree of simplicity is reached through the AOPDF,which enables full control over the acquisition parameters via an electrically driven phase and amplitude spectro-temporal tailoring of the imaging ***,contrary to most single-shot techniques,the frame rate,exposure time,and frame intensities can be independently adjusted in a wide range of pulse durations and chirp values without resorting to complex shaping stages,making the system remarkably agile and *** the other hand,the use of DIH,which does not require any reference beam,allows to achieve an even higher technical simplicity by allowing its lensless operation but also for reconstructing the object on a wide depth of field,contrary to classical techniques that only provide images in a single *** imaging speed of the system as well as its flexibility are demonstrated by visualizing ultrashort events on both the picosecond and nanosecond *** virtues and limitations as welll as the potential improvements of this on-demand ultrafast imaging method are critically discussed.

关键词： simplicity resort bringing

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Protective effect of ashwagandha (Withania somnifera) against neurotoxicity induced by aluminum chloride in rats

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Asian Pacific Journal of Tropical Biomedicine 2018年第1期8卷 59-66页

作者： mohamed E.Elhadidy Hussein G.Sawie nagwa A.Meguid Yasser A.Khadrawy Department of Research on Children with Special Needs Medical Research DivisionNational Research Centre Department of Medical Physiology Medical Research DivisionNational Research Centre

Objective: To evaluate the neuroprotective effect of ashwagandha extract against aluminum chloride-induced neurotoxicity in rats. Methods: Rats were divided into control, aluminumintoxicated rats treated daily with aluminum trichloride(Al Cl3)(100 mg/kg, orally) for 30 d and aluminum-intoxicated animals protected by receiving daily ashwagandha extract(200 mg/kg, orally) one hour before Al Cl3 administration for 30 d. Levels of lipid peroxidation, nitric oxide, reduced glutathione and tumor necrosis factor-α were measured in the cortex, hippocampus and striatum. In addition, the activities of Na+, K+, ATPase and acetylcholinesterase were determined in the three studied brain regions. Results: Aluminum increased the levels of lipid peroxidation and nitric oxide in the cortex, hippocampus and striatum and decreased the reduced glutathione level in the hippocampus and striatum. In rats protected with ashwagandha extract, non significant changes were observed in lipid peroxidation, nitric oxide and reduced glutathione. In addition, ashwagandha extracts prevented the increased activity of acetylcholinesterase and Na+, K+, ATPase induced by Al Cl3 in the cortex, hippocampus and striatum. The present findings also showed that the significant increase in tumor necrosis factor-α induced by Al Cl3 in the cortex and hippocampus was prevented by ashwagandha extract. Conclusions: The present results suggest that ashwagandha extract possesses antioxidant and anti-inflammatory effects against aluminum neurotoxicity. In addition, ashwagandha extract could prevent the decline in cholinergic activity by maintaining normal acetylcholinesterase activity. The later effect could recommend the use of ashwagandha as a memory enhancer.

关键词： Ashwagandha Neurotoxicity Oxidative stress TNF-α acetylcholinesterase Na+/K+-ATPase

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Quantification of Silicon (SI) and Silicon Dioxide (SiO₂) from the Nafud Desert-Al-Qassim Region, Kingdom of Saudi Arabia Using XRD Analysis

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Advances in Materials Physics and Chemistry 2024年第5期14卷 67-75页

作者： nagwa Ibrahim mohamed Department of Physics College of Science Qassim University Buraydah Saudi Arabia

This research was conducted in the Qassim region, Kingdom of Saudi Arabia. The goal of this research is to determine the percentage of silicon in the Rub al-Khali desert. Samples were collected from four cities located in the Al-Qassim Region of Saudi Arabia (Uyun Al-Jawa, Al-Fuwailiq, Al-Sulaibiya, and Al-Qawara), from three distinct depths (the earth’s surface, 50 cm, and 100 cm). The percentages of silicon in these places vary between the highest value for silicon dioxide, which is 74.47 m/m%, and 34.8 m/m% for silicon in Al-Qawara city at a depth of 100 cm. We used an x-ray fluorescence (XRF) instrument to evaluate the samples. There are high percentage of both silica and silicon in the Nafud desert. Studies have shown that these ratios can help investors benefit from an element of Silicon and silicon dioxide, so the sands of the Nafud desert is sufficient for extracting Silicon and silica in huge quantities. This may transform the Kingdom into a leading country in the global computer technology industry that depends on silicon extracted from the desert sands, the most important of which are microcomputer data processing devices.

关键词： Silica Sand Dispersive X-Ray Fluorescence (EDXRF) Analyzer Solar Cells Nafud Desert Al-Qawwarh

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Combining Monte Carlo simulations and dosimetry measurements for process control in the Tunisian Cobalt-60 irradiator after three half lives of the source

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Nuclear Science and Techniques 2017年第9期28卷 119-128页

作者： Leila Ounalli Maroua Bhar Arbi Mejri Kais Manai ammar Bouabidi Shayma mohamed Abdallah Nafaa Reguigui Tunisian Center for Nuclear Sciences and Technology Technopark Sidi Thabet 2020 Ariana Tunisia Laboratory on Energy and Matter for Nuclear SciencesDevelopment Technopark Sidi Thabet 2020 Ariana Tunisia Tunisian Higher Institute of Medical Technologies 9 RueZouhair Essafi 1006 TUNIS 1006 Tunis Tunisia Faculty of Sciences of Tunis Technopark Sidi Thabet2020 Ariana Tunisia College of Science and Arts University of Bisha BishaKingdom of Saudi Arabia

To check the dose uniformity and to determine the efficiency of medical devices sterilization by gamma irradiation after three half lives of the source, calculations of the absorbed dose were carried out. Monte Carlo simulations and dosimetry measurements, were established to study the radiation processing quality control. An isodose chart was created by GEANT4 Monte Carlo code to evaluate the absorbed dose rate uniformity inside the irradiation room from the year of the installation until the year of the source reload. The dose uniformity ratio(DUR) is deduced from maximum and minimum experimental doses in medical devices after three half lives of the source.

关键词：剂量测量蒙特卡洛半衰期过程控制辐照模拟钴-60 突尼斯 Geant4

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Clinical outcomes of transepithelial photorefractive keratectomy versus femtosecond laser assisted keratomileusis for correction of high myopia in South Egyptian population

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International Journal of Ophthalmology(English edition) 2020年第1期13卷 129-134页

作者： Amr Mounir Engy mohamed Mostafa Hatem ammar Osama Ali Mohammed Alahmady Hamad Alsmman Mahmoud mohamed Farouk mohamed Gamal Elghobaier Department of Ophthalmology Sohag Faculty of MedicineSohag UniversitySohag 82524Egypt Egyptian Police Hospitals Cairo 11765Egypt

AIM: To evaluate the safety and efficacy of transepithelial photorefractive keratectomy(t-PRK) with adjuvant mitomycin C(MMC) versus femtosecond laser assisted keratomileusis(Femto-LASIK) in correction of high ***: Prospective randomized comparative study including 156 eyes of 156 patients with high myopia and a spherical equivalent refraction(SER) <-6.00 D. They were divided randomly into two groups: Group A included 72 eyes treated with t-PRK with adjuvant MMC and Group B included 84 eyes treated with Femto-LASIK. Visual acuity, SER, corneal topography, pachymetry and keratometry were assessed for 12 mo ***: The preoperative mean SER was-8.86±1.81 and-9.25±1.70 D in t-PRK MMC group and Femto-LASIK respectively(P=0.99) which improved to-0.65±0.43 D and-0.69±0.50 D at 12 mo follow up. Mean SER remained stable during the 12 mo of follow-up, with no statistically significant difference between the two groups(P=0.64). In t-PRK MMC group, only six eyes needed retreatment after six months of follow up. And two eyes showed haze(one reversible haze grade 2, while the other had dense irreversible haze grade 4).CONCLUSION: t-PRK MMC provides safe and satisfactory visual outcomes and acceptable risk as Femto-LASIK in patients with high myopia.

关键词： transepithelial photorefractive keratectomy femtosecond laser assisted keratomileusis high myopia corneal haze Egypt

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