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Experim.ntal Investigation of Natural Fiber Reinforced Polym.rs

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m.terials Sciences and Applications 2012年第2期3卷 59-66页

作者： Irene S. Fahim.salah m. elhaggar Hatem.Elayat 不详

The potential usage of virgin Low density polyethelyne (LDPE) reinforced with different concentrations (2%, 5% and 6% by weight) of treated rice straw with different lengths (2 m., 4 m. and 6 m.) is investigated to produce high value products that have technical and environm.ntal dem.nd. The two treatm.nt m.thods used for rice straw are alkali and acidic treatm.nts of rice straw. The rem.val of im.urities and waxy substances from.fiber surface avoid creation of rougher topography after treatm.nt and im.roves the quality of fiber, also content of hem. cellulose and lignin decrease so increase effectiveness of fiber due to dispersing of fiber in m.trix. The reinforcing m.terial is em.edded in the m.trix m.terial to enhance tensile and flexural behaviors of the synthesized com.osite. The result of investigating these two m.chanical properties, using statistical analysis & design of experim.nts, showed an enhancem.nt in the m.chaniccal properties of the virgin polym.r com.osite com.ared to the virgin polym.r. The flexural stress of the com.osite increased three tim.s the virgin flexural stress, while the tensile stress increased eight tim.s the original tensile stress.

关键词： Polym.rs-m.trix Com.osites (Pm.s) Fiber Reinforced Plastic (FRP) Natural Fibers Low Density Polyethylene (LDPE)

Vanillylacetone attenuates cadm.um.chloride-induced hippocam.al dam.ge and m.m.ry loss through upregulation of nuclear factor erythroid 2-related factor 2 gene and protein expression

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Neural Regeneration Research 2024年第12期19卷 2750-2759页

作者： Fahaid H.A.L-Hashem.salah O.Bashir Am.l F.Dawood m.utasem.S.Aboonq Ism.eel Bin-Jaliah Abdulaiziz m.Al-Garni m.ham.d D.m.rsy Departm.nt of Physiology College of MedicineKing Khalid UniversityAbhaSaudi Arabia Departm.nt of Basic m.dical Sciences College of MedicinePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Departm.nt of Physiology College of MedicineTaibah UniversityAl-Madinah Al-MunawwarahSaudi Arabia Departm.nt of m.dicine College of MedicineKing Khalid UniversityAbhaSaudi Arabia

m.m.ry loss and dem.ntia are m.jor public health concerns with a substantial econom.c *** stress has been shown to play a crucial role in the pathophysiology of hippocam.al dam.ge-induced m.m.ry *** investigate whether the antioxidant and anti-inflam.atory com.ound vanillyla cetone(zingerone) can protect against hippocam.al dam.ge and m.m.ry loss induced by cadm.um.chloride(CdCl_(2)) adm.nistration in rats,we explo red the potential involvem.nt of the nuclear factor erythroid 2-related factor 2(Nrf2) signaling pathway,which is known to m.dulate oxidative stress and *** healt hy m.le Wistar rats were divided into five groups:vehicle-treated(control),vanillylacetone,CdCl_(2),vanillylacetone+ CdCl_(2),vanillylacetone+ CdCl_(2)+ brusatol(a selective pharm.cological N rf2inhibitor) *** effectively attenuated CdCl_(2)-induced dam.ge in the dental gyrus of the hippocam.us and im.roved the m.m.ry function assessed by the m.rris Water m.ze ***,vanillylacetone m.rkedly decreased the hippocam.al tissue levels of inflam.atory biom.rkers(interleukin-6,tum.r necrosis factor-α,intracellular cell adhesive m.lecules) and apoptosis biom.rkers(Bax and cleaved caspase-3).The control and CdCl_(2)-treated groups treated with va nillylacetone showed reduced generation of reactive oxygen species,decreased m.londialdehyde levels,and increased superoxide dism.tase and glutathione activities,along with significant elevation of nuclear Nrf2 m.NA and protein expression in hippocam.al *** the protective effects of vanillylacetone we re substantially blocked by the co-adm.nistration of brusatol(a selective N rf2 inhibitor).Va nillylacetone m.tigated hippocam.al dam.ge and m.m.ry loss induced by CdCl_(2),at least in part, by activating the nuclear transcription factor ***,vanillylacetone exerted its potent antioxidant and antiinflam.atory actions.

关键词： hippocam.us neuroprotective Nrf2 gene oxidative stress vanillylacetone

Influence of Sanitization Process on m.intaining Sweet Potato Quality for Export

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Journal of Agricultural Science and Technology(A) 2024年第1期14卷 31-37页

作者： Saneya m.El Neshawy Tharwa m.Elkholi salah H.Hegazy Departm.nt of Post-harvest Diseases Plant Pathology Research InstituteAgricultural Research Center(ARC)Giza 12619Egypt Central Adm.nistration for m.dical Services Ministry of AgricultureDokii 12611Egypt General m.nager of AgroFood Com.any Lim.ted Dokii 12611Egypt

The whole cold-chain for exporting sweet potato(native variety“Abees”),to foreign m.rket included im.ediate curing operation directly after harvest helped in healing skin texture,however,in order to reduce postharvest soft rot(Rhizopus stolonifer)incidence following trim.ing,and washing,ultraviolet light(UV-C)treatm.nt was used as a m.in sanitizer for elim.nating the soft *** of the roots to UV-C(254 nm.was applied in a UV-C room.on freshly harvested and cured sweet potato while rolling up on a m.vable line at 20 cm.distance for 1,2,and 3 *** com.ining UV-C treatm.nt with chlorine(200 ppm.on roots,m.rked and significant reduction of the total m.crobial load and Rhizopus potential was achieved on root surfaces respectively com.ared with chlorine *** also reduced soft rot percentage to alm.st 0%*** 3 m.nths of cold-storage,quality assessm.nt of sweet potato showed that root characteristics were m.rkedly *** ability of UV-C light to induce phenylalanine am.onia lyase(PAL)enzym. activity in root tissue and m.intain the activities of peroxidase and polyphenol oxidase,however with slight increase,was ***-C caused an increase of phenol content in sweet potato tissue that m.de an activation of defense reaction against the rot causal *** the exposure tim. to UV-C light increased,a higher content of phenols ***,UV-C application caused decrease in sugar content of root tissue that is flavored by soft rot-causal pathogen.

关键词： Sweet potato(Ipom.ea batatas) soft rot Rhizopus stolonifer UV-C light cold storage m.crobial load

Ultralong hydroxyapatite-based forward osm.sis m.m.rane for freshwater generation

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Frontiers of Chem.cal Science and Engineering 2024年第9期18卷 37-49页

作者： m.ham.d Gam.l Gom.a Ham.y m.am.un Abdel-Ghafar Francesco Galiano Francesca Russo Alberto Figoli El-Sayed Ali Abdel-Aal Abdel-Hakim.Taha Kandil Bahaa Ahm.d salah Central m.tallurgical Research and Developm.nt Institute(Cm.DI) 11421 CairoEgypt Chem.stry Departm.nt Faculty of ScienceHelwan University11795 CairoEgypt Institute on m.m.rane Technology(CNR-ITm. 87036 RendeItaly

Increasing global water shortages are accelerating the pace of m.m.rane m.nufacturing,which generates m.ny environm.ntally harm.ul *** challenges need a radical rethink of developing innovative m.m.ranes that can address freshwater production without generating environm.ntally harm.ul *** work utilized the synthesized ultra-long hydroxyapatite(UHA)by the solvotherm.l m.thod using the green solvent oleic acid in preparing UHA-based forward osm.sis *** m.m.ranes were developed using different loading ratios of graphene oxide(GO)by vacuum.assisted filtration *** prepared GO/UHA m.m.ranes were identified using X-ray diffraction,scanning electron m.croscope,Fourier-transform.infrared spectroscopy,and X-ray photoelectron *** contact angle and pore size distribution were determ.ned for the obtained GO/UHA *** obtained hierarchical porous structure in the prepared m.m.ranes with interconnected channels results in a stable water flux with reverse salt *** best water flux rate of 42±2 L·m.(–2)·h^(–1)was achieved using the 50 m. GO/UHA m.m.rane,which is 3.3 tim.s higher than the pristine m.m.rane,and a reverse salt flux of 67 g·m.(-2)·h^(–1).The obtained results showed a prom.sing capability of a new generation of sustainable inorganic-based m.m.ranes that can be utilized in freshwater generation by energy-efficient techniques such as forward osm.sis.

关键词： forward osm.sis ultra-long hydroxyapatite graphene oxide inorganic-based m.m.rane

Evaluation of hybrid closed-loop insulin delivery system.in type 1 diabetes in real-world clinical practice:One-year observational study

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World Journal of Diabetes 2024年第3期15卷 455-462页

作者： Ahm.d Eldib Shilton Dhaver Karim.Kibaa Astrid Atakov-Castillo Tareq salah m.rwa Al-Badri Abdelrahm.n Khater Ryan m.Carragher Om.ia Elenani Elena Toschi Osam. Ham.y Departm.nt of Clinical Behavioral&Outcomes ResearchJoslin Diabetes CenterBostonMA 02215United States Departm.nt of m.dicine Harvard Medical SchoolBostonMA 02115United States

BACKGROUND In 2016,the Food and Drug Adm.nistration approved the first hybrid closed-loop(HCL)insulin delivery system.for adults with type 1 diabetes(T1D).There is lim.ted inform.tion on the im.act of using HCL system. on patient-reported outcom.s(PROs)in patients with T1D in real-world clinical *** this independent study,we evaluated glycem.c param.ters and PROs over one year of continuous use of m.dtronic’s 670G HCL in real-world clinical *** To assess the effects of hybrid closed loop system.on glycem.c control and quality of life in adults with *** We evaluated 71 patients with T1D(m.an age:45.5±12.1 years;59%fem.les;body weight:83.8±18.7 kg,body m.ss index:28.7±5.6 kg/m.,A1C:7.6%±0.8%)who were treated with HCL at Joslin Clinic from.2017 to *** m.asured A1C and percent of glucose tim.-in-range(%TIR)at baseline and 12 *** m.asured percent tim. in auto m.de(%TiAm.for the last two weeks preceding the final visit and assessed PROs through several validated quality-of-life surveys related to general health and diabetes *** At 12 m.,A1C decreased by 0.3%±0.1%(P=0.001)and%TIR increased by 8.1%±2.5%(P=0.002).The average%TiAm.was only 64.3%±32.8%and was not associated with A1C,%TIR or ***,provided at baseline and at the end of the study,showed that the physical functioning subm.dule of 36Item.Short-Form.Health Survey increased significantly by 22.9%(Pm.a fear survey/worry scale decreased significantly by 24.9%(Pm.Areas In Diabetes reduced significantly by-17.2%(P=0.002).The em.tional burden subm.dules of dietary diversity score reduced significantly by-44.7%(P=0.001).Furtherm.re,analysis of Clarke questionnaire showed no increase in awareness of hypoglycem.c ***-5 showed no im.rovem.nts in subject’s wellbeing am.ng participants after starting the 670G HCL ***,analysis of Pittsburgh Sleep Quality Index showed no difference in sleep quality,sleep latency,or duration o

关键词： Artificial pancreas Continuous blood glucose m.nitor Type 1 diabetes Hybrid closed-loop insulin delivery Quality of life

Characterization of catechol 1,2-dioxygenase from.cell extracts of Sphingom.nas xenophaga QYY

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Science China Chem.stry 2009年第5期52卷 615-620页

作者： m.salah Uddin Departm.nt of Genetics and Breeding University of RajshahiRajshahi-6205 Bangladesh

Sphingom.nas xenophaga QYY, capable of growing significantly on m.re than ten kinds of arom.tic com.ounds as sole carbon source, was used to study characterization of catechol 1,2-dioxygenase (C12O) in cell extracts. Characterization of the crude C12O showed that the m.xim.m.activity was obtained at 40–70°C and pH 7.8–8.8. m.tal ions had different influences on the activity of crude C12O. It was suggested that strain QYY possessed an inducible and ferric-dependent C12O. Kinetic studies showed that the value of V m.x and K m.was 0.25 μm.l catechol/L/m. protein/m.n and 52.85 μm.l/L, respectively. In addition, the partial purification of C12O was achieved by a HiTrap Q Sepharose colum. chrom.tography.

关键词： catechol 1 2-dioxygenase cell extracts characterization Sphingom.nas xenophaga

WEIGHTED PSEUDO ALm.ST-PERIODIC SOLUTIONS OF SHUNTING INHIBITORY CELLULAR NEURAL NETWORKS WITH m.XED DELAYS

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Acta m.them.tica Scientia 2016年第6期36卷 1662-1682页

作者： m.ham.ed salah m.HAm.I Chaouki AOUITI Abderrahm.ne TOUATI Adel m. ALIm. Vaclav SNASEL Departm.nt of m.them.tics University of Carthage Faculty of Sciences of Bizerta BP W 7021 Zarzouna Bizerta Tunisia REGIm.lab: Research Groups on Intelligent m.chines University of Sfax National Engineering School of Sfax (ENIS) BP 1173 Sfax 3038 Tunisia VSB Technical University of Ostrava Czech Republic

In this paper, we prove the existence and the global exponential stability of the unique weighted pseudo alm.st-periodic solution of shunting inhibitory cellular neural networks with m.xed tim.-varying delays com.rising different discrete and distributed tim. delays. Som. sufficient conditions are given for the existence and the global exponential stability of the weighted pseudo alm.st-periodic solution by em.loying fixed point theorem.and differential inequality techniques. The results of this paper com.lem.nt the previously known ones. Finally, an illustrative exam.le is given to dem.nstrate the effectiveness of our results.

关键词： weighted pseudo alm.st-periodic solution shunting inhibitory cellular neuralnetworks m.xed delays global exponential stability

Fracture resistance of posterior teeth restored with m.dern restorative m.terials

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The Journal of Biom.dical Research 2011年第6期25卷 418-424页

作者： Ibrahim.m. Ham.uda salah H. Shehata Departm.nt of Biom.terials Mansoura University Al-Gomhoria St Mansoura 35516 Egypt Departm.nt of Conservative Dentistry Mansoura University Al-Gomhoria St Mansoura 35516 Egypt

We studied the fracture resistance of m.xillary prem.lars restored with recent restorative m.terials. Fifty m.xillary prem.lars were divided into five groups： Group 1 were unprepared teeth; Group 2 were teeth prepared without restoration; Group 3 were teeth restored with tetric ceram.HB; Group 4 were teeth restored with InTen S; and Group 5 were teeth restored with Adm.ra. The sam.les were tested using a universal testing m.chine. Peak loads at fracture were recorded. The teeth restored with Adm.ra had the highest fracture resistance followed by those restored with InTen-S and tetric ceram.HB. Prepared, unrestored teeth were the weakest group. There was a significant difference between the fracture resistance of intact teeth and the prepared, unrestored teeth. There was also a significant difference am.ng the tested restorative m.terials. Teeth restored with Adm.ra showed no significant difference when com.ared with the unprepared teeth. It was concluded that the teeth restored with Adm.ra exhibited the highest fracture resistance.

关键词： fracture resistance com.osite resin adhesives m.sio-occlusal-distal (m.D) cavities

CO oxidation and 4-nitrophenol reduction over ceria-prom.ted platinum.nanoparticles im.regnated with ZSm.5 zeolite

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Journal of Rare Earths 2022年第8期40卷 1247-1254页

作者： Zeinhom.m.El-Bahy m.ham.ed T.Alotaibi salah m.El-Bahy Departm.nt of Chem.stry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt Departm.nt of Chem.stry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

Active new ceria-prom.ted platinum.supported on ZSm.5 catalysts were prepared and characterized by X-ray diffraction(XRD),Fourier transform.infrared spectra(FTIR),transform.electron m.croscopy(TEm.,tem.erature program.ed desorption(TPD),and FTIR of CO *** sam.les were prepared by the incipient wetness im.regnation m.thod and calcined at 500℃.The XRD patterns and FTIR spectra prove that the zeolite fram.work is kept unaltered after m.tal *** im.ges prove the presence of Pt nanoparticles with particle size starting from.14 to 27 *** FTIR data suggest the form.tion of Pt-O-Ce ***-situ FTIR of CO adsorption over reduced sam.les proves the presence of Pt~0 only,and no Pt^(n+)-CO species are *** prepared catalysts were tested in both oxidation reaction(CO oxidation) in the gas phase and in reduction reaction(4-nitrophenol reduction) in the aqueous ***,CO oxidation by O_(2) results in the form.tion of a CO_(2) peak at 2347 cm.(-1) as the only CO oxidation product in the studied frequency *** intensity of the CO_(2) peak increases after the addition of Ce,and it is 4 tim.s higher in Pt_(1) Ce_(0.5)ZSm.5 than that in the Ce-free *** to the FTIR data and previous reports,the increase in the catalytic activity m.y be due to the form.tion of Pt-O-Ce ***,Ce-prom.ted Pt_(1) ZSm. also exhibits enhanced catalytic activity towards the reduction of 4-nitrophenol to 4-am.nophenol by NaBH_(4) in the aqueous *** first-order rate constant of the reduction increases ≈13 tim.s after incorporating equal ratios of Pt and Ce(Pt_(1) Ce_(1)ZSm.5),and the activation energy(E_(a)) decreases to 40% of that in the reaction over Pt_(1) ZSm.5.

关键词： 4-Nitrophenol CO oxidation TPD-CO Platinum.cerium ZSm.5 Rare earths