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Synthesis of reduced graphene oxide nanosheets from sugarcane dry leaves by two-stage pyrolysis for antibacterial activity

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Nano Materials Science 2024年第5期6卷 625-634页

作者： Baskar Thangaraj Pravin Raj Solomon Nutthapon Wongyao mohamed I.helal Ali Abdullah Sufian Abedrabbo Jamal Hassan Department of Physics Khalifa UniversityAbu Dhabi127788United Arab Emirates Molecular Epidemiological Diagnostic Research Facility Department of ImmunologySchool of Biological SciencesMadurai Kamaraj UniversityMadurai625021Tamil NaduIndia Fuel Cells and Hydrogen Research and Engineering Center Pilot Plant Development and Training InstituteKing Mongkut's University of Technology ThonburiBangkok10140Thailand CORE Lab Specialist Electron Microscopy Core LabsKhalifa UniversityAbu Dhabi127788United Arab Emirates

Oxidative-exfoliation methods were in vogue in the production of rGO from *** of such synthetic graphite needs high temperatures(2500℃).Thus,such process is not *** present study is made on the dry leaves of sugarcane(Saccharum officinarum)as an alternative raw material so as to be economical and environmentally *** dry leaves are subjected to two-step pyrolysis without any catalyst or reducing agent in far divergent temperatures to produce as prepared and acid treated *** were evaluated by UV–Vis.,FTIR,XRD,Raman spectroscopy,TGA/DTG,BET,FESEM-EDS and *** as prepared rGO has few layers with irregular and folded architecture whereas acid-treated rGO has thinly stacked crumpled sheets with many wrinkles on its *** prepared rGOs have multilayered graphitic structure due to the unique ratio between G and D *** treated rGO has poor thermal stability as compared to that of as-prepared rGO at high temperatures due to the variation in the oxygen-containing functional *** treated rGO has low antibacterial activity as compared to that of the as-prepared rGO due to the paucity of the functional groups.

关键词： Biomass wastes Sugarcane dry leaves Pyrolysis Reduced graphene oxide Antibacterial activity

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Study of a crop-pest-natural enemy model with Z-type control——An approach to pest management

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International Journal of Biomathematics 2023年第4期16卷 175-207页

作者： Dibyendu Sekhar Mandal Sudip Samanta Rana D.Parshad Abdennasser Chekroun mohamed helal Joydev Chattopadhyay Department of Mathematics AmityUniversity Maharashtra Mumbai Maharashtra 410206India Agricultural and Ecological Research Unit Indian Statistical Institute 203B.T.Road Kolkata 700108India Department of Mathematics Bankura University WestBengal722155India Department of Mathematics Iowa State University AmesIA 50011USA Laboratoire d'Analyse Nonlineaire et Mathematiques Appliquees University of Tlemcen Tlemcen 13000Algeria Biomathematics Laboratory Universite Sidi Bel-Abbes P.B.8922000Algeria

In this study,the Z-type control method is applied to an intraguild crop-pest-natural enemy model,assuming that the natural enemy can predate on both crop and pest *** this purpose,the indirect Z-type controller is considered in the natural enemy *** providing the design function for the crop-pest-natural enemy model with Z-control,we find the analytical expression of the update *** findings indicate that the uncontrolled system can produce chaos through perioddoubling bifurcation due to crop over-consumption by the pest *** draw a Poincare map to confirm the occurrence of chaos and compute the maximum Lyapunov *** the observations further indicate that the pest population can be controlled by using an indirect Z-control mechanism in the natural enemy population,we postulate that,if natural enemy abundance can be governed by the update parameter,any desired pest population abundance can be achieved through the proposed Z-type controller,thus controlling the *** verify these assertions,extensive numerical simulations are performed to explore the potential for practical application of the proposed Z-type controller.

关键词： Crop-pest-natural enemy model Z-type control numerical simulations pest control

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Multi-omics in nanoplastic research:a spotlight on aquatic life

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Frontiers of Environmental Science & Engineering 2024年第11期18卷 21-38页

作者： mohamed helal Min Liu Honghong Chen Mingliang Fang Wenhui Qiu Frank Kjeldsen Knut Erik Tollefsen Vengatesen Thiyagarajan Henrik Holbech Elvis Genbo Xu Department of Biology University of Southern DenmarkOdense 5230Denmark National Institute of Oceanography and Fisheries(NIOF) Cairo 11865Egypt School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore 639798Singapore Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Environmental Science and Engineering Fudan UniversityShanghai 200433China Department of Biochemistry and Molecular Biology University of Southern DenmarkOdense M 5230Denmark Norwegian Institute for Water Research(NIVA) Oslo N-0579Norway Norwegian University of Life Sciences(NMBU) Ås N-1432Norway The Swire Institute of Marine Sciences School of Biological SciencesThe University of Hong KongHong Kong 999077China

Amidst increasing concerns about plastic pollution’s impacts on ecology and health,nanoplastics are gaining global recognition as emerging environmental *** review aimed to examine the complex molecular consequences and underlying fundamental toxicity mechanisms reported from the exposure of diverse aquatic organisms to *** the comprehensive examination of transcriptomics,proteomics,and metabolomics studies,we explored the intricate toxicodynamics of nanoplastics in aquatic *** review raised essential questions about the consistency of findings across different omics approaches,the value of combining these omics tools to understand better and predict ecotoxicity,and the potential differences in molecular responses between *** amalgamating insights from 37 omics studies(transcriptome 22,proteome six,and metabolome nine)published from 2013 to 2023,the review uncovered both shared and distinct toxic effects and mechanisms in which nanoplastics can affect aquatic life,and recommendations were provided for advancing omics-based research on nanoplastic *** comprehensive review illuminates the nuanced connections between nanoplastic exposure and aquatic ecosystems,offering crucial insights into the complex mechanisms that may drive toxicity in aquatic environments.

关键词： Ecotoxicity Transcriptomics Metabolomics Proteomics Plastic pollution Toxicity mechanisms

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Environmental pollution and diabetes mellitus

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World Journal of Meta-Analysis 2021年第3期9卷 234-256页

作者： Amany El-Sikaily mohamed helal National Institute of Oceanography and Fisheries(NIOF) Cairo 21513Egypt

Diabetes mellitus(DM)is a chromic metabolic disease that affects a large segment of the population *** inactivity,poor nutrition,and genetic predisposition are main risk factors for disease *** the last decade,it was clear to the scientific community that DM development is linked to a novel disease inducer that was later defined as diabetogenic factors of pollution and endocrine disrupting *** pollution is exponentially increasing in uncontrolled manner in several *** pollutants are of diverse nature and toxicities,including polyaromatic hydrocarbons(PAHs),pesticides,and heavy *** the current review,we shed light on the impact of each class of these pollutants and the underlined molecular mechanism of diabetes induction and biological ***,a brief overview about the connection between coronavirus disease 2019 and diabetes pandemics is presented.

关键词： Diabetes mellitus Glucose Heavy metals Polyaromatic hydrocarbons Pesticide COVID-19

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Anti-inflammatory and Chemical Composition of Two Plants Family Asteraceae Growing in Saudi Arabia

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Journal of Chemistry and Chemical Engineering 2014年第2期8卷 157-162页

作者： Eman Elsharkawy Mona Alshathly mohamed helal Plant Ecology and Range Department Desert Research Center Cairo 15753 Egypt Chemistry Department Northern Border University Afar 054 Saudi Arabia Zoology Department Northern Border University Arar 054 Saudi Arabia Chemistry Department Northern Border University RaJha 054 Saudi Arabia

The study was designed to investigate the anti-inflammatory and composition of essential oil of two plant family Asteraceae, Achillea fragrantissima and Lactuca serriola growing under dry desert condition. The anti-inflammatory effect of volatile oil extracted by hydrodistillation of plants was studied using carrageenan induced paw edema. Essential oil （100 mg/kg） and （200 mg/kg） were tested the two plant show high inhibition after 4 h, concentration （200 mg/kg） show high inhibition than （100 mg/kg） after 4 h. Sesqui sabinene hydrate, Azuline and u-Bisabolol are the main constituents of the volatile oil were investigated by capillary GC （gas chromatography） and GC-MS （gas chromatography-mass spectrometry）. The discussion shows the role of chemical compound azulene in inflammatory inhibition.

关键词： Achillea fragrantissima Lactuca serriola anti-inflammatory azulene.

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Regulating microstructure and composition by carbonizing in-situ grown metal-organic frameworks on cotton fabrics for boosting electromagnetic wave absorption

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Nano Research 2024年第8期17卷 7290-7300页

作者： Jie Jin Hongsen Long Hu Liu Yan Guo Tiantian Bai Ben Bin Xu Mohammed A.Amin Hua Qiu mohamed H.helal Chuntai Liu Changyu Shen Zeinhom M.El-Bahy Zhanhu Guo State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410000China School of Electronic Engineering North China University of Water Resources and Electric PowerZhengzhou 450046China Complex Conditions of High-end Tire Technology Innovation Center Shuguang Rubber Industry Research&Design Institute Co.LtdGuilin 541004China Integrated Composites Lab Department of Mechanical and Civil EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Chemistry Faculty of Arts and ScienceNorthern Border UniversityRafha 73213Saudi Arabia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

High-temperature carbonized metal-organic frameworks(MOFs)derivatives have demonstrated their superiority for promising electromagnetic wave(EMW)absorbers,but they still suffer from limited EMW absorption capacity and narrow *** the advantage of microstructure and chemical composition regulation for the design of EMW absorber,hierarchical heterostructured MoS_(2)/CoS_(2)-Co_(3)O_(4)@cabonized cotton fabric(CF)(MCC@CCF)is prepared by growing ZIF-67 MOFs onto CF surface,chemical etching,and *** from the dual loss mechanism of magnetic-dielectric multicomponent carbonized MOFs,chemical etching and carbonization process can effectively introduce abundant micro-gap structure that can result in better impedance matching and stronger absorption capacity via internal reflection,doped heteroatoms(Mo,N,S)to supply additional dipolar polarization loss,and numerous heterointerfaces among MoS_(2),CoS_(2),Co_(3)O_(4),and CCF that produce promoted conduction loss and interfacial polarization ***,a minimal reflection loss of−52.87 dB and a broadest effective absorption bandwidth of 6.88 GHz were achieved via tunning the sample thickness and filler loading,showing excellent EMW absorption *** research is of great value for guiding the research on MOFs derivatives based EMW absorbing materials.

关键词： metal-organic frameworks hierarchical structure chemical etching sulfurization electromagnetic wave absorption

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A Topological Magueijo-Smolin Varying Speed of Light Theory, the Accelerated Cosmic Expansion and the Dark Energy of Pure Gravity

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Applied Mathematics 2014年第12期5卷 1780-1790页

作者： mohamed Salah El Naschie Leila Marek-Crnjac mohamed Atef helal Ji-Huan He Department of Mathematics Faculty of Science Cairo University Cairo Egypt Department of Physics Faculty of Science University of Alexandria Alexandria Egypt Nantong Textile Institute National Engineering Laboratory for Modern Silk College of Textile and Clothing Soochow University Suzhou China Technical School Center of Maribor Maribor Slovenia

The paper presents a detailed analysis of ordinary and dark energy density of the cosmos based on two different but complimentary theories. First, and starting from the concept of the speed of light being an average over multi-fractals, we use Magueijo-Smolin’s ingenious revision of Einstein’s special relativity famous formula E = mc2 to a doubly special formula which includes the Planck energy as invariant to derive the ordinary energy density E(O) = mc2/22 and the dark energy density E(D) = mc2(21/22) wheremis the mass andcis the speed of light. Second we use the topological theory of pure gravity to reach the same result thus confirming the correctness of the theory of varying speed of light as well as the COBE, WMAP and Type 1a supernova cosmological measurements.

关键词： Dark Energy Quantum Gravity Varying Speed of Light Theory Energy of Quantum Wave Quantum Non-Demolition

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Time to integrate“One Health Approach”into nanoplastic research

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Eco-Environment & Health 2023年第1期2卷 18-20页

作者： mohamed helal Nanna B.Hartmann Farhan R.Khan Elvis Genbo Xu Department of Biology University of Southern DenmarkOdense5230Denmark Department of Environmental and Resource Engineering Technical University of Denmark2800 Kgs.LyngbyDenmark Norwegian Research Centre(NORCE) Nygårdsporten 112NO-5008BergenNorway

Large-scale production of plastics began in the 1950s followed by an onset of exponential growth,leading to its current widespread and dominant *** this,no holistic risk assessment has yet been made on the health and environmental impacts of plastics,their degradation products,or their constituent *** entering the environment,plastics undergo structural,chemical,and functional transformations,leading to the creation of microplastics and nanoplastics[1,2,3].Environmental exposure to microplastics and nanoplastics becomes inevitable,causing direct human dietary exposure.

关键词： plastics integrate spite

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Synthesis of New Biologically Active Sulphur Containing Compounds Incorporating Diphenyl Ether Moiety

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材料科学与工程（中英文B版） 2011年第4期1卷 461-471页

作者： Kalil Ali H.A. Eyada mohamed T. Abd EI-Rahman mohamed Hamdy helal mohamed Sayed Abd-Elal.El-Gaby Gameel Ahmed mohamed El-Hag Ali Chemistry Department Faculty of Science Ain Shams University Cairo Egypt Chemistry Department Faculty of Science Al-Azhar University Nasr City Cairo Egypt Chemistry Department Faculty of Science Al-Azhar University Assuit Assuit Egypt

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Biochemical Liver Functions and Molecular Identification of Fasciola hepatica from Experimentally Infected Rat Model

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Open Journal of Animal Sciences 2024年第2期14卷 88-100页

作者： Omnia M. Kandil Emad B. Ata Margarita P. Gabrashanska Hatem A. Shalaby Tamer H. Abd El-Aziz Noha M. F. Hassan Soad M. Nasr mohamed A. helal Ebtesam M. Al-Olayan Department of Parasitology & Animal Diseases Veterinary Research Institute National Research Centre Giza Egypt Institute of Experimental Morphology Pathology and Anthropology with Museum Bulgarian Academy of Sciences Sofia Bulgaria Department of Zoology Collage of Science King Saud University Riyadh Saudi Arabia

The current study was performed to evaluate the liver function status as well as molecular characterization of the recovered worms in rats experimentally infected with F. hepatica. Sixteen male Wister rats aged 30 days were randomly allocated into two groups (n = 8). The first group was infected orally with 15 viable encysted metacercaria of F. hepatica per animal. The other group was kept non-infected (control group). At zero time (before infection), the 2nd, 4th, 6th, 8th, 10th, 12th and 14th weeks post-infection (WPI), blood and serum samples were collected via puncture of retro-orbital plexus of veins from each rat. Serum enzyme level (AST and ALT) and total protein were measured, and the serum protein profile was carried out using agarose gel electrophoresis. During the period of the experiment, serum ALT and AST activities and serum total globulins significantly increased while serum total proteins and albumin markedly decreased in the infected group. On the 14th WPI, the data of the electropherogram showed that globulin fractions (α1-, β- and γ-globulin) levels were significantly increased while α2-globulin was markedly decreased in the infected group. The molecular analysis confirmed the amplification of the ITS1, ITS2 and NDI genes of F. hepatica recovered from the infected liver of rats with amplicon sizes of 630, 510 and 560 bp, respectively. Sequencing of the amplified ITS gene resulted in the determination of 3 strains (PP108836, PP108837, and PP108838). Also, analysis of the ITS2 gene resulted in obtaining 3 isolates under the accession numbers (PP109065, PP109066, and PP109067). In conclusion, fasciolosis in the rat model is suitable for routine experimental infections and caused a pronounced liver dysfunction with discharging of the Fasciola eggs in the faeces and the development of adult stages in the bile ducts. Furthermore, molecular techniques are a sensitive

关键词： Fasciola hepatica Liver Functions Serum Enzymes Serum Protein Electrophoresis Molecular Characterization

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