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Fabrication, modification and environmental applications of TiO2 nanotube arrays （TNTAs） and nanoparticles

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Frontiers of Chemical Science and Engineering 2012年第1期6卷 112-122页

作者： S. ROhANI T. ISImJAN A. mohamed h. KAZEmIAN m. SALEm T. WANG Department of Chemical and Biochemical Engineering The University of Western Ontario London N6A 5B9 Canada

Among the semiconductors, titanium dioxide has been identified as an effective photocatalyst due to its abundance, low cost, stability, and superior electronic energy band structure. highly ordered nanotube arrays of titania were produced by anodization and mild sonication. The band gap energy of the titania nanotube arrays was reduced to 2.6 eV by co-doping with Fe, C, N atoms using an electrolyte solution containing K3Fe（CN）6. The photo- conversion of phenol in a batch photoreactor increased to more than 18% based on the initial concentration of phenol by using a composite nanomaterial consisting of titania nanotube arrays and Pt/ZIF-8 nanoparticles. A layer-by- layer assembly technique for the deposition of titania nanoparticles was developed to fabricate air filters for the degradation of trace amounts of toluene in the air and preparation of superhyrophobic surfaces for oil-water separation and anti-corrosion surfaces.

关键词： TiO2 nanotube arrays and nanoparticles,anodization bandgap modification layer-by-layer deposi-tion oil-water separation

Some reactions of 4-aryl-1 (2h)-phthalazinones

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Chinese Journal of Chemistry 1990年第6期8卷 549-554页

作者： SOLImAN A.Y. BAKEER h.m. SAYED m.A. ISLAm I. mohamed A.A. Department of Chemistry Faculty of EducationFayoumEgypt Faculty of Science Ain Shams UniversityCairoEgypt Faculty of Science El-Azher UniversityCairoEgypt

The behayiors of 4-aryl-1 (2h)-phthalazinones (1a-c)toward carbon nucleophiles (Grignard reagents) and secondary amine under mannich conditions as well as the nucleophilic substitution reaction on chlorophthalazine de... 详细信息

关键词： OC Some reactions of 4-aryl-1 phthalazinones

Synthesis and reactions of 4-aryl-1(2h) phthalazinones

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Chinese Journal of Chemistry 1991年第1期9卷 45-53页

作者： SAYED,m.A. ISLAm,I. mohamed,A.A. SOLImAN,A.Y. BAKEER,h.m. Department of Chemistry Faculty of ScienceAin Shams and El-Azher UniversitiesEgypt Department of Chemistry Faculty of Education at FayoumCairo UniversityEgypt

The behavior of 4-aryl-1(2h)-phthalazinones (1a-c) toward some electrophilic and nucleophilic reagents has been described with the aim of preparing some new phthalazinone deriva- tives of the expected pharmacological ... 详细信息

关键词： Synthesis and reactions of 4-aryl-1 phthalazinones

Ovarian Vein Thrombosis, Critical Diagnosis at Al-hasahisa Obstetrics & Gynecology Teaching hospital in Geziera State, Sudan

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Open Journal of Obstetrics and Gynecology 2023年第6期13卷 1020-1024页

作者： mohamed ElAmin m. A. Elkhazein Atif B. E. Fazari mohamed Bakry habeeb Parveen B. m.h.mmed Elrasheed h. A. m.h.mmed Al-hasahisa Obstetrics & Gynecology Teaching hospital Rufaa Sudan Faculty of medicine Albutana University Rufaa Sudan Latifa hospital DHA Dubai UAE Faculty of medicine University of Medical Sciences & Technology Khartoum Sudan

Ovarian vein thrombosis (OVT) is a rare thrombotic condition commonly attributed to the puerperium. The complications of OVT can be significant, and diagnosis relies on a high clinical index of suspicion. It can occur with lower quadrant pain that may mimic a surgical abdomen, especially in the setting of recent pregnancy, abdominal surgery, inflammatory disease, or malignancy. Diagnosis can be made with confidence using ultrasound, computed tomography, or magnetic resonance imaging. management of OVT is particularly important in postpartum patients, with anticoagulation therapy being the treatment of choice.

关键词： Ovarian Vein Thrombosis Puerperium Pregnancy

Influence of light pattern thickness on the manipulation of dielectric microparticles by optoelectronic tweezers

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Photonics Research 2022年第2期10卷 550-556页

作者： Shuailong Zhang mohamed Elsayed Ran Peng Yujie Chen Yanfeng Zhang Steven L.Neale Aaron R.Wheeler School of mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of TechnologyBeijing 100081China Department of Chemistry University of TorontoTorontoOntario M5S 3H6Canada Institute of Biomedical Engineering University of TorontoTorontoOntario M5S 3G9Canada Donnelly Centre for Cellular and Biomolecular Research University of TorontoTorontoOntario M5S 3E1Canada Department of marine Engineering Dalian Maritime UniversityDalian 116026China State Key Laboratory of Optoelectronic materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China James Watt School of Engineering University of GlasgowGlasgow G128QQUK

Optoelectronic tweezer(OET) is a useful optical micromanipulation technology that has been demonstrated for various applications in electrical engineering and most notably cell selection for biomedical engineering. In this work, we studied the use of light patterns with different shapes and thicknesses to manipulate dielectric microparticles with OET. It was demonstrated that the maximum velocities of the microparticles increase to a peak and then gradually decrease as the light pattern’s thickness increases. Numerical simulations were run to clarify the underlying physical mechanisms, and it was found that the observed phenomenon is due to the co-influence of horizontal and vertical dielectrophoresis forces related to the light pattern’s thickness. Further experiments were run on light patterns with different shapes and objects with different sizes and structures. The experimental results indicate that the physical mechanism elucidated in this research is an important one that applies to different light pattern shapes and different objects, which is useful for enabling users to optimize OET settings for future micromanipulation applications.

关键词： pattern dielectric light

Antibacterial, Antioxidant Activities and GC-mS Analysis of Dichrostachys cinera (L.) Ethanolic Leaves Extract

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Pharmacology & Pharmacy 2022年第12期13卷 545-557页

作者： Sitelbanat Yassin mohamed Abubker Anwar mohamed Selma Omer Salah humeada Elhadi m. m. Ahmed mirghani Abd Alrahman Department of Pharmaceutics (Pharmaceutical microbiology) University of Gezira Wad Madani Sudan Department of Pharmaceutical Chemistry University of Gezira Wad Madani Sudan Central Laboratory University of Gezira Wad Madani Sudan Department of microbiology Faculty of Medical Laboratory Sciences University of Gezira Wad Madani Sudan Department of Chemistry Faculty of Education West Kordofan University Kordofan Sudan Department of Pharmacognosy University of Gezira Wad Madani Sudan medicinal and Aromatic Plants Research Center University of Gezira Wad Madani Sudan Department of Clinical Pharmacy and Pharmacy Practice University of Gezira Wad Madani Sudan

Traditional medicinal plants are one of the potential sources of antimicrobial drugs and there is a great concern in the use and development of herbal medicine for the treatment of various infections. This study aimed to evaluate the antibacterial, and antioxidant activities of Dichrostachys cinera ethanolic leaves extract and to determine the components of the crude extract. D. cinera extract was evaluated against Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 27853. The antibacterial, antioxidant activities and active constituents were determined using standard methods. Antibacterial activity of the crude extract findings showed that all bacterial candidates were susceptible where S. aureus represent mIC at 12.5 mg/ml and mBC at 25 mg/ml, E. coli and P. aeruginosa both showed mIC 25 mg/ml and mBC 50 mg/ml. In the free radical scavenging assay of the extract and the standard quercetin at concentrations of 250 μg/ml, 125 μg/ml, 50 μg/ml, 10 μg/ml, and 5 μg/ml. The radical scavenging activity for the extract was about 92%, 89.6%, 86.8%, 82.8% and 37.8% respectively, compared to quercetin which gave 89.7%, 85.8%, 62.1%, 55.5%, and 45% radical scavenging activity. The GC-ms analysis of the total constituents demonstrated that 1,6-Anhydro-2,4-dideoxy-.beta.-D-ribo-hexo (21.26%) with different peaks, followed by Glycerin (11.56%), 1,2,3-Cyclopentanetriol (10.18%), 8,11,14-Eicosatrienoic acid, (Z,Z,Z)-(6.18%), 1h-Pyrrole, 1-methyl-(6.08%), Phytol (5.91%) and 7-Bromo-6-(2-diethylaminoethoxy)-2,3-dihyd (5.44%) as major components in the extract. Finally, this study provided useful information on the therapeutic potential of D. cinera as an antibacterial agent and recommended to be evaluated against a wide range of Bacterial and fungal strains using different solvents and different parts from the plant.

关键词： Dichrostachys cinera Antibacterial Activity Antioxidant GC mS Analysis

Analysis of global and local stress changes in a longwall gateroad

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International Journal of mining Science and Technology 2018年第1期28卷 127-135页

作者： I.B.Tulu G.S.Esterhuizen D.Gearhart T.m.Klemetti K.m.mohamed D.W.h.Su Department of mining Engineering West Virginia University NIOSh Pittsburgh Mining Research Division

A numerical-model-based approach was recently developed for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall *** this approach, a systematic procedure is used to estimate the model's *** along the bedding planes is modeled with ubiquitous joint elements and interface *** is modeled with a newly developed coal mass *** response of the gob is calibrated with back analysis of subsidence data and the results of previously published laboratory tests on rock *** model results were verified with the subsidence and stress data recently collected from a longwall mine in the eastern United States.

关键词： Longwall mining Gateroad design Flac3D horizontal angle Gob loading hollow inclusion cells

Phytochemical, antioxidant and hepatoprotective effects of different fractions of moringa oleifera leaves methanol extract against liver injury in animal model

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Asian Pacific Journal of Tropical medicine 2018年第7期11卷 423-429页

作者： Attia h.Atta Soad m.Nasr Abduljalil h.Almaweri Doaa Sedky Amany m.mohamed hassan m.Desouky mostafa A.Shalaby Department of Pharmacology Faculty of Veterinary Medicine Cairo University Department of Parasitology & Animal Diseases National Research Centre(Egypt) Department of Animal Reproduction and Artificial Insemination National Research Centre(Egypt)

Objective: To evaluate the potential antioxidant and hepatoprotective effects of n-hexane, dichloromethane(DCm), ethyl acetate(EtOAc), n-butanol and aqueous fractions of moringa oleifera(m. oleifera) leaves methanol extract against carbon tetrachloride(CCl_4)-induced liver injury in rats. methods: These fractions were prepared from the m. oleifera leaves methanol extract by solubilization in water and partitioning in n-hexane, EtOAc, DCm and n-butanol. Their phyto-components were identified by GC-mS analysis. The in vitro antioxidant effect of these fractions was carried out by assessment of 1,1-diphenyl-2-picrylhydrazyl scavenging activity. A total of 40 Sprague Dawley rats were allocated into 8 equal groups: group 1 given olive oil(1 m L/kg ***.), group 2 injected with CCl_4, group 3 to 7 administered with n-hexane, DCm, EtOAc, n-butanol and aqueous fractions, respectively after CCl_4, group 8 administered with silymarin after CCl_4. The activities of aspartate aminotransferase, alanine aminotransferase, and the levels of total cholesterol, triglycerides, glucose, total proteins and albumin in serum were determined spectrophotometrically. Glutathione reduced, lipid peroxide by-products levels, glutathione-s-transferase and catalase enzyme activities in the liver homogenate were determined by spectrophotometer. Liver specimens were also examined for histopathological alterations under light microscope. Results: The GCmS analysis of different fractions of the m. oleifera leaves methanol extract revealed that n-hexane, DCm, EtOAc, n-butanol, and aqueous fractions contained 17, 22, 23, 19 and 32 compounds, respectively. The percent and the molecular structure of each component in each fraction were identified. The n-butanol and EtOAc fractions exhibited the strongest in vitro antioxidant activity against 1,1-diphenyl-2-picrylhydrazyl. CCl_4 significantly decreased glutathione reduced and total proteins concentration and glutathione-s-transferase and catalase activiti

关键词： hepatoprotective Antioxidants moringa oleifera Fractions Phytochemical

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