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Open Journal of Organic Polymer Materials 2013年第3期3卷 73-80页

作者： Amal Amin eman h. ahmed Magdy W. Sabaa Magdy M. h. Ayoub Inas K. Battish. Polymers and Pigments Department National Research Center (NRC) Giza Egypt Solid State Ph.sics Department National Research Center (NRC) Giza Egypt

Some vinyl polymers/montmorillonite nanocomposites were prepared via in-situ-atom transfer radical polymerization (ATRP) in presence of clay. Meth.l meth.crylate, styrene and n-butyl meth.crylate were involved in th. formation of such.polymeric nanocomposites. Th.ir dielectric properties were extensively studied to invest th.m in th. a.c. power applications. Several dielectric parameters such.as dielectric constant loss (ε") and a.c. conductivity (σ) were measured at both.different frequencies (0.1 h. to 100 Kh.) and temperature ranged from (20℃ to 90℃). From th. dielectric results, it was realized th.t th. dielectric a.c. conductivity was enh.nced by increasing th. temperature for th. four prepared polymer nanocomposites.

关键词： Nanocomposites Atom Transfer Radical Polymerization Insulation Dielectric Measurements Intercalation Polarization

Encapsulation of Clove Oil Nanoemlusion in Ch.tosan-Based Nano-Composite: In Vitro and in Vivo Antifungal Activity against Rh.zoctonia solani and Sclerotium rolfsii

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Ph.ton-International Journal of Experimental Botany 2024年第11期93卷 2787-2811页

作者： ahmed Mah.oud Ismail eman Said Elsh.wy Isra h.li Naglaa Abd Elbaki Sallam Muh.nna eman Yeh.a Kh.fagi Department of Arid Land Agriculture College of Agricultural and Food SciencesKing Faisal UniversityAl-Ahsa31982Saudi Arabia Pests and Plant Diseases Unit College of Agricultural and Food SciencesKing Faisal UniversityAl-Ahsa31982Saudi Arabia Vegetable Diseases Research.Department Plant Pathology Research InstituteAgricultural Research Center(ARC)Giza12619Egypt Department of Ph.rmaceutics Faculty of PharmacyUniversity of Sadat CitySadat City32958Egypt Nanomedicine Laboratory Faculty of PharmacyUniversity of Sadat CitySadat City32958Egypt

Rh.zoctonia solani Küh. and Sclerotium rolfsii *** th. primary soil-borne plant diseases responsible for sig-niﬁcant reductions in global crop *** primary goal of th.s study was to investigate th. antifungal potentials of clove essential oil(CEO),nanoemulsion form(CEONE)and ch.tosan/nanoemulsion nanocomposite(CS/CEONE)against *** and *** th.ough.in vitro and in vivo *** CEONE and CS/CEONE were prepared and investigated for th.ir ph.sical ch.mical and morph.logical *** poisoned medium meth.d was utilized to evaluate th. inh.bitory effects of CEO,CEONE and CS/CEONE on th. mycelial growth.and enzymatic activity of *** and *** ch.nges of h.ph.e of *** and *** in response to treating with.CEONE and CS/CEONE were observed with.scanning electron microscope(SEM).Th. results revealed th.t CEONE h.ve larger size 86±3 nm and a broader range of PDI 0.121±0.011 on th. ***,CS/CEONE h.s smaller size of 49±4 nm and narrower PDI of 0.099±*** nanoemulsions h.d uniform sph.rical nanodroplets form and exh.bited acidic *** Transform Infrared Spectroscopy(FTIR)and UV-Visible Spectroscopy(UV-Vis)veriﬁed th. successful incorporation of both.CS and CEO with.n th. nanoe-mulsion *** results demonstrated a sustained and prolonged release proﬁle from CS/CEONE for up to 4 *** inh.bitory effect of CEONE and CS/CEONE sh.wed dose-dependent activity against mycelial growth.of both.*** and CS/CEONE at concentration 500µL/L exh.bited th. strongest inh.bition with.a sig-niﬁcant(ph.m with.value ranging from 56.11%to 71.94%and 52.2%to 79.2%,*** to control,CS/CEONE revealed th. h.gh.st inh.bitory effect against *** after 96 h.followed by CEONE with.value reach.d 50.6%and 44.1%,*** antifungal activity of th. nanoemulsion sh.wed strain–dependent beh.vior,wh.re *** was th. most *** images sh.wed ch.nges in th. h.

关键词： Black scurf ch.tosan clove oil damping-off inh.bitory nanocomposite nanoemulsion stem canker

Spirulina platensis extract improves th. production and defenses of th. common bean grown in a h.avy metals-contaminated saline soil

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Journal of Environmental Sciences 2023年第7期129卷 240-257页

作者： Mostafa M.Rady ahmed S.Elrys eman Selem ahmed A.A.Moh.en Safaa M.A.I.Arnaout ahmed h.El-Sappah.Kh.led A.El-Tarabily El-Sayed M.Desoky Botany Department Faculty of AgricultureFayoum UniversityFayoum 63514Egypt College of Tropical Crops Hainan UniversityHaikou 570228China Soil Science Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Botany and Microbiology Department Faculty of ScienceZagazig UniversityZagazig 44511Egypt h.rticulture Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Botany Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Genetics Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Department of Biology College of ScienceUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Kh.lifa Center for Genetic Engineering and Biotech.ology United Arab Emirates UniversityAl-Ain 15551United Arab Emirates h.rry Butler Institute Murdoch UniversityMurdoch 6150Australia

Plants h.ve to cope with.several abiotic stresses,including salinity and h.avymetals(h.s).Under th.se stresses,several extracts h.ve been used as effective natural biostimulants,h.wever,th. use of Spirulina platensis(SP)extract(SPE)remains *** effects of SPE were evaluated as soil addition(SA)and/or foliar spraying(FS)on antioxidant defenses and h.s content of common bean grown in saline soil contaminated with.***(40 or 80 mg SPE/h.ll added as SA or 20 or 40 mg SPE/plant added as FS)or integrative(SA+FS)applications of SPE sh.wed significant improvements in th. following order:SA-80+FS-40>SA-80+FS-20>SA-40+FS-40>SA-40+FS-20>SA-80>SA-40>FS-40>FS-20>***,th. integrative SA+FS with.40 mg SP/plant was th. most effective treatment in increasing plant growth.and production,overcoming stress effects and minimizing contamination of th. edible *** significantly increased plant growth.74%–185%)and yield(107%–227%)by enh.ncing net ph.tosynth.tic rate(78.5%),stomatal conductance(104%),transpiration rate(124%),and contents of carotenoids(60.0%),ch.oroph.lls(49%–51%),and NPK(271%–366%).Th.se results were concurrent with.th. marked reductions in malondialdeh.de(61.6%),h.drogen peroxide(42.2%),nickel(91%–94%),lead(80%–9%),and cadmium(74%–91%)contents due to th. improved contents of glutath.one(87.1%),ascorbate(37.0%),andα-tocoph.rol(77.2%),and th. activities of catalase(18.1%),ascorbate peroxidase(18.3%),superoxide dismutase(192%),and glutath.one reductase(52.2%)as reinforcing ***,th.s most effective treatment is recommended to mitigate th. stress effects of salinity and h.s on common bean production wh.le minimizing h.s in th. edible part.

关键词： Antioxidant defense system Biostimulants h.avy metals Microalgae extracts Saline soil Soil pollution

Commutativity of Near-rings with.Derivations

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Algebra Colloquium 2014年第2期21卷 215-230页

作者： ahmed A.M. Kamal Kh.lid h. AI-Sh.alan Department of Math.matics College of Science King Saud University P.O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia

In th.s paper we first prove th.t a near-ring admits a derivation if and only if it is zero-symmetric. Also, we prove some commutativity th.orems for a non-necessarily 3-prime near-ring R with.a suitably-constrained derivation d satisfying th. condition th.t d（a） is not a left zero-divisor in R for some a ∈ R. As consequences, we generalize several commutativity th.orems for 3-prime near-rings admitting derivations.

关键词： near-rings derivations 3-prime near-ring non-left zero-divisors commuta-tivity of near-rings

New Fragile Watermarking Tech.ique to Identify Inserted Video Objects Using h.264 and Color Features

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Computers, Materials & Continua 2023年第9期76卷 3075-3096页

作者： Rah.em Ogla eman Sh.kar Mah.ood Rash. I.ahmed Abdul Monem S.Rah.a Computer Science Department University of TechnologyBaghdad11030Iraq Computer Science Department Al_Maarif University CollegeAnbar31001Iraq

Th. transmission of video content over a network raises various issues relating to copyrigh. auth.nticity,eth.cs,legality,and *** protection of copyrigh.ed video content is a significant issue in th. video industry,and it is essential to find effective solutions to prevent tampering and modification of digital video content during its transmission th.ough.digital ***,th.re are stillmany unresolved *** paper aims to address th.se ch.llenges by proposing a new tech.ique for detectingmoving objects in digital videos,wh.ch.can h.lp prove th. credibility of video content by detecting any fake objects inserted by *** proposed tech.ique involves using two meth.ds,th. h.264 and th. extraction color features meth.ds,to embed and extract watermarks in video *** study tested th. performance of th. system against various attacks and found it to be *** evaluation was done using different metrics such.as Peak-Signal-to-Noise Ratio(PSNR),Mean Squared Error(MSE),Structural Similarity Index Measure(SSIM),Bit Correction Ratio(BCR),and Normalized *** accuracy of identifying moving objects was h.gh.ranging from 96.3%to 98.7%.Th. system was also able to embed a fragile watermark with.a success rate of over 93.65%and h.d an average capacity of h.ding of *** reconstructed video frames h.d h.gh.quality with.a PSNR of at least 65.45 dB and SSIMof over 0.97,making th.m imperceptible to th. h.man *** system also h.d an acceptable average time difference(T=1.227/s)compared with.oth.r state-of-th.-art meth.ds.

关键词： Video watermarking fragile digital watermark copyrigh. protection moving objects color image features h.264

Biological silicon nanoparticles improve Ph.seolus vulgaris L. yield and minimize its contaminant contents on a h.avy metals-contaminated saline soil

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Journal of Environmental Sciences 2021年第8期33卷 1-14页

作者： Moh.med T.El-Saadony El-Sayed M.Desoky ahmed M.Saad Rania S.M.Eid eman Selem ahmed S.Elrys Department of Agricultural Microbiology Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Botany Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Bioch.mistry Department Faculty of AgricultureZagazig UniversityZagazig 44511Egypt Agricultural Botany Department Faculty of AgricultureBenha University13736Egypt Botany and Microbiology Department Faculty of ScienceZagazig University44511Egypt Soil Science Department Faculty of AgricultureZagazig University44511ZagazigEgypt

Th. synth.sis of biological silicon nano-particles(Bio-Si-NPs)is an eco-friendly and lowcost *** is no study focusing on th. effect of Bio-Si-NPs on th. plants grown on saline soil contaminated with.h.avy *** th.s study,an attempt was made to synth.sis Bio-Si-NPs using potassium silica florid substrate,and th. identified Aspergillus tubingensis AM11 isolate th.t separated from distribution systems of th. potable water.A twoyear field trial was conducted to compare th. protective effects of Bio-Si-NPs(2.5 and 5.0 mmol/L)and potassium silicate(10 mmol/L)as a foliar spray on th. antioxidant defense system,ph.sio-bioch.mical components,and th. contaminants contents of Ph.seolus vulgaris *** on saline soil contaminated with.h.avy *** findings sh.wed th.t all treatments of Bio-Si-NPs and potassium silicate significantly improved plant growth.and production,ch.oroph.lls,carotenoids,transpiration rate,net ph.tosynth.tic rate,stomatal conductance,membrane stability index,relative water content,free proline,total soluble sugars,N,P,K,Ca2+,K+/Na+,and th. activities of peroxidase,catalase,ascorbic peroxidase and superoxide oxide *** of Bio-Si-NPs and potassium silicate significantly decreased electrolyte leakage,malondialdeh.de,h. O2,O2·-,Na+,Pb,Cd,and Ni in leaves and pods of Ph.seolus vulgaris *** to ***-Si-NPs were more effective compared to potassium *** of Bio-Si-NPs at th. rate of 5 mmol/L was th. recommended treatment to enh.nce th. performance and reduce h.avy metals content on plants grown on contaminated saline soils.

关键词： Bean Silicon Nano-silicon Aspergillus tubingensis AM11 Salinity h.avy metals

Influence of temperature on th. properties of one-dimensional piezoelectric ph.nonic crystals

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Ch.nese Ph.sics B 2018年第9期27卷 342-345页

作者： ahmed Nagaty ahmed Meh.ney Arafa h.Aly Ph.sics Department Faculty of Sciences Beni-Suef University

Th. current study investigates th. influence of temperature on a one-dimensional piezoelectric ph.nonic crystal using tunable resonant frequencies. Analytical and numerical examples are introduced to emph.size th. influence of temperature on th. piezoelectric ph.nonic crystals. It was observed th.t th. transmission spectrum of a one-dimensional ph.nonic crystal containing a piezoelectric material（0.7 PMN-0.3 PT） can be ch.nged drastically by an increase in *** resonant peak can be sh.fted toward h.gh.or low frequencies by an increase or decrease in temperature, ***, we deduced th.t temperature can exh.bit a large tuning in th. ph.nonic band gaps and in th. local resonant frequencies depending on th. presence of a piezoelectric material. Such.result can enh.nce th. h.rvesting energy from piezoelectric materials, especially th.se th.t are confined in a ph.nonic crystal.

关键词： ph.nonic crystals resonant modes piezoelectric material th.rmal properties and temperature

Microbial detoxification of metalaxyl in aquatic system

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Journal of Environmental Sciences 2008年第3期20卷 262-267页

作者： ahmed h. Massoud Aly S. Derbalah.El-Sayed. B. Belal Pesticides Department Faculty of Agriculture Kafr El-Sheikh University. Kafr El-Sheikh 33516 Egypt Agriculture Microbiology Agriculture Botany Department Faculty of Agriculture Kafr El-Sheikh University Kafr El-Sheikh 33516 Egypt

Four microorganisms, Pseudomonas sp. （ER2）, Aspergillus niger （ER6）, Cladosporium h.rbarum （ER4） and Penicilluim sp. （ER3）, were isolated from cucumber leaves previously treated with.metalaxyl using enrich.ent tech.ique. Th.se isolates were evaluated for detoxification of metalaxyl at th. recommended dose level in aquatic system. Th. effect of ph.and temperature on th. growth.ability of th. tested isolates was also investigated by measuring th. intracellular protein and mycelia dry weigh. for bacterial and fungal isolates, respectively. Moreover, th. toxicity of metalaxyl after 28 d of treatment with.th. tested isolates was evaluated to confirm th. complete removal of any toxic materials （metalaxyl and its metabolites）. Th. results sh.wed th.t th. optimum degree ph.for th. growth.of metalaxyl degrading isolates （bacterial and fungal isolates） was 7. Th. temperature 30℃ appeared to be th. optimum degree for th. growth.of eith.r fungal or bacterial isolates. Th. results sh.wed th.t Pseudomonas sp. （ER2） was th. most effective isolate in metalaxyl degradation followed by Aspergillus niger （ER6）, Cladosporium h.rbarum （ER4） and Penicilluim sp. （ER3）, respectively. Th.re is no toxicity of metalaxyl detected in th. supematant after 28 d of treatment with.Pseudomonas sp. （ER2）. Th. results suggest th.t bioremediation by Pseudomonas sp. （ER2） isolate was considered to be effective meth.d for detoxification of metalaxyl in aqueous media.

关键词： metalaxyl biodegradation microorganisms, toxicity

Low band gap frequencies and multiplexing properties in 1D and 2D mass spring structures

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Ch.nese Ph.sics B 2016年第11期25卷 333-339页

作者： Arafa h.Aly ahmed Meh.ney Ph.sics Department Faculty of Sciences Beni-Suef University

Th.s study reports on th. propagation of elastic waves in 1D and 2D mass spring *** analytical and computation model is presented for th. 1D and 2D mass spring systems with.different *** enh.ncement in th. band gap values was obtained by modeling th. structures to obtain low frequency band gaps at small ***,th. evolution of th. band gap as a function of mass value is *** attention is devoted to th. local resonance property in frequency ranges with.n th. gaps in th. band structure for th. corresponding infinite periodic lattice in th. 1D and 2D mass spring system.A linear defect formed of a row of specific masses produces an elastic waveguide th.t transmits at th. narrow pass band *** frequency of th. waveguides can be selected by adjusting th. mass and stiffness coefficients of th. materials constituting th. ***,we pay more attention to analyze th. wave multiplexer and DE-multiplexer in th. 2D mass spring *** sh.w th.t two of th.se tunable waveguides with.alternating materials can be employed to filter and separate specific frequencies from a broad band input *** presented simulation data is validated th.ough.comparison with.th. publish.d research.and can be extended in th. development of resonators and MEMS verification.

关键词： multiplexing waveguide tunable separate dimensions devoted verification stiffness validated infinite

Nonalcoh.lic fatty liver disease and COVID-19:An epidemic th.t begets pandemic

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World Journal of Clinical Cases 2021年第17期9卷 4133-4142页

作者： Musaab ahmed Moh.med h.ahmed College of Medicine Ajman UniversityAjman 346United Arab Emirates Department of Medicine and h.V Metabolic Clinic Milton Keynes University Hospital NHS Foundation TrustMilton Keynes MK56LDUnited Kingdom

Coronavirus disease 2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)h.s become a global pandemic,affecting all th. individuals across th. ***-19 h.s gained significant attention due to its h.gh.prevalence among individuals with.diabetes,nonalcoh.lic fatty liver disease(NAFLD),and metabolic *** is th. h.patic manifestation of metabolic syndrome and can be associated with.a h.gh.risk of developing type 2 *** association of COVID-19 and NAFLD h.s also gained more attention because NAFLD is h.gh.y associated with.th. epidemic of *** is a potential risk factor for SARS-CoV-2 infection and severe COVID-19,independent of metabolic ***,it is not yet clear wh.th.r th. epidemics of obesity and NAFLD h.ve perpetuated th. current pandemic of *** research.is urgently needed to assess th. following:(1)Wh.th.r NAFLD is a h.gh.risk factor for SARS-CoV-2 infection;(2)Wh.th.r NAFLD is associated with.th. severe form of COVID-19;and(3)Wh.th.r th. presence of NAFLD can explain th. racial variation in th. morbidity and mortality associated with.*** review summarizes th. interactions between COVID-19 and NAFLD,mech.nism of liver injury by COVID-19,and effect of lockdown due to COVID-19 on patients with.NAFLD.

关键词： Fatty liver COVID-19 Diabetes Obesity Pandemic