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Variable range hopping transport and dielectric relaxation mechanism in GdCrO_(3) rare-earth orthochromite perovskite

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Journal of Rare Earths 2024年第7期42卷 1304-1316,I0004页

作者： Muhammad Javed Ayaz Arif Khan jamal Kazmi Naeem Akbar said Nasir Khisro Amanullah Dar Aleem Dad Khan Tareen Mohd Ambri Mohamed Department of Physics The University of Azad Jammu and KashmirMuzaffarabad13100Pakistan Department of Physics University of Kotli Azad Jammu and KashmirKotli11100Pakistan Institute of Microengineering and Nanoelectronics Universiti Kebangsaan Malaysia43600BangiSelangorMalaysia Department of Mathematics University of Kotli Azad Jammu and KashmirKotli11100Pakistan

The polycrystalline GdCrO_(3)(GCO)perovskite orthochromite was synthesized by the sol-gel auto-combustion *** Rietveld refined X-ray diffraction(XRD)profile of GCO confirms that the orthorhombic phase crystallizes in perovskite crystal structure with space group *** transmission electron microscopy and selected area electron diffraction divulge the polycrystalline nature of the perovskite *** field emission scanning electron microscopy(FESEM)images reveal the microstructural polyhedral growth of grains separated by sharp grain *** chemical states of the ions present in the compound were investigated by X-ray photoelectron spectroscopy(XPS)studies,and the electrical pathways were *** impedance studies were carried out in the experimental frequency and temperature ranges of 40 Hz-4 MHz and 178-408 K,*** equivalent circuit model(RGQG)(RGBQGB)resolves the impedance response into two contributions originating from the intra-grain and inter-granular micro-constituents of the *** electrical conduction mechanism is based on the Mott variable range hopping *** complex electric modulus studies demonstrate the short-and long-range mobility of the charge carriers and rule out the presence of electrode effects on the dielectric relaxation mechanism of the *** decreasing pattern of dielectric permittivity with frequency is explained by the Maxwell-Wagner type of *** frequency dependence of the loss factor exhibits the presence of thermally activated relaxation time distribution in the material.

关键词： Auto-combustion Perovskite Electro-ceramic Dielectric Electrical transport Impedance

Composition analysis and antimicrobial activity of essential oil from leaves of Laurus nobilis grown in Oman

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Journal of Bioresources and Bioproducts 2022年第4期7卷 328-334页

作者： Siham Saleh Al-Abri Sadri Abdullah said Salem said Al Touby Mohammed Amzad Hossain jamal Nasser Al-Sabahi School of Pharmacy College of Pharmacy and NursingUniversity of NizwaPB 33PO 616NizwaNizwa 616Oman School of Nursing College of Pharmacy and NursingUniversity of NizwaNizwa 616Oman Central Instrument Laboratory College of Agriculture and Marine SciencesSultan Qaboos UniversityMuscat 123Oman

Traditionally,Laurus nobilis is used for the treatment of earaches and skin rashes as well as *** most common technique to isolate the oil is hydro-distillation and *** investigation presented in this paper was aimed to unravel the antimicrobial activity and chemical composition of essential oil in the leaves of *** grown in *** essential oil was extracted from the leave of the selected plant species by hydro distillation using Clevenger type *** antimicrobial assay was done by disc diffusion methods against three bac-terial strains,Staphylococcus aureus,Pseudomonas aeruginosa and Escherichia coli,and one fungal strain:Candida *** isolated essential oil was analyzed by gas chromatography-mass spectrometry(GC-MS).The percentage yield of the essential oil was 0.064%(w/w).The essen-tial oil was found actively against the applied bacterial and fungal *** highest activity was found against *** and the lowest was against ***,and the order was ***>***>*** essential oil was also active against the fungus *** range of inhibition zones was 6-14 *** results of GC-MS analysis showed(E)-𝛽-caryophyllene to be the major component about 59.62%.Other major components included𝛼-selinene(14.03%),𝛼-humulene(8.65%),𝛽-selinene(4.99%),and𝛼-pinene(4.98%).In addition,several minor com-ponents were found in the essential oil of *** on the experimental results,it showed that the plant species that grown in Oman were a potential source of therapeutic *** con-clusion,the essential oil and the plant could be used as natural and potential therapeutic agents to treat earaches,skin rashes,and rheumatism.

关键词： Laurus nobilis Clevenger apparatus Essential oil Antimicrobial activity Gas chromatography-mass spectrometry(GC-MS)

YIELD AND FRUIT QUALITY OF ALMOND,PEACH AND PLUM UNDER REGULATED DEFICIT IRRIGATION

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Frontiers of Agricultural Science and Engineering 2021年第4期8卷 583-593页

作者： Rachid RAZOUK Abdellah KAJJIAnas HAMDANI jamal CHARAFI Lahcen HSSAINI said BOUDA National Agricultural Research Institute MeknesBP 578Morocco Laboratory of Biotechnology and Valorization of Plant Genetic Resources Faculty of Sciences and TechniquesUniversity of Sultan Moulay SlimaneBeni MellalBP 523Morocco

The effects of regulated deficit irrigation(RDI)on the performance of almond ***,peach ***-Hall and plum *** were assessed on the Saiss Plain(NW,Morocco)over three consecutive growing seasons(2011–2013).Irrigation treatments consisted of a control,irrigation applied to fully satisfy crop water requirements(100%ETC),and two RDI treatments,irrigation applied to 75%ETC(RDI-75)and 50%ETC(RDI-50).These three treatments were applied during fruitgrowth slowdown periods corresponding to Stages II and III in almond and Stage II in peach and *** and fruit quality traits were *** effect of RDI differed between *** and fruit size were reduced significantly only in peach under *** quality improved in this species in the first year of the experiment,with an increase of sugar/acid ratio and polyphenol *** quality also improved but the effects were significant only in the second and third *** results were recorded in almond kernel,but their epidermal grooves were deeper under RDI-50,and this may have affected their commercial *** is concluded that water can be saved during the fruitgrowth slowdown period by up to 25%in peach and 50%in almond and plum with improvements in fruit quality without affecting total yield.

关键词： fruit quality fruit yield Prunus domestica Prunus dulcis Prunus persica regulated deficit irrigation

ATR–FTIR Spectroscopy Combined with the Invitro Antioxidant Activity and Chromaticity for Rapid Discrimination of Fig(Ficus carica L.)Cultivars

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Journal of Analysis and Testing 2021年第3期5卷 270-285页

作者： Lahcen Hssaini Rachida Ouaabou Rachid Razouk jamal Charafi Hafi da Hanine Karim Houmanat said Ennahli Rachid Lahlali National Institute for Agricultural Research(INRA) BO578MeknesMorocco Faculty of Science Semlalia Cadi Ayyad UniversityBO 2390MarrakeshMorocco Laboratory of Bioprocess and Bio-Interfaces Faculty of Science and TechnicsBO 523Beni-MellalMorocco National School of Agriculture(ENA) BO S/40MeknesMorocco

Vibrational spectroscopy analysis of full-ripened fig fruits(Ficus carica L.)was acquired using Fourier-transformed infrared(FTIR)spectroscopy by attenuated total reflectance(ATR).The objective of this study was to investigate accurate discrimination of 25 fig cultivars using chemometric analysis of both ATR-FTIR fingerprinting and in-vitro antioxidant activity along with chromatic coordinates ***-vitro antioxidant activity was assessed through three methods and displayed statistically significant differences across cultivars and between the fruit parts,with promising antioxidant *** spectra were measured separately on both peels and pulp to better know which fruit part provides high discrimination throughput between *** results showed vibration intensities of five fingerprint regions displaying statically significant *** highest vibration intensity occurred in the region of 1175-940 cm^(-1)including the phenols *** components analysis based on integrated intensities corresponding to fingerprint regions,revealed two main groups in pulp samples,while five groups in peels *** pulp extracts of’Nabout’showed a typical vibration in 3000-2800 cm^(-1)and 1775-1725 cm^(-1)regions and,therefore was classified as single subset in cultivars *** cultivar had a lightcolored fig and exhibited the highest antioxidant potency for all essays particularly in peel *** biochemical assessment and FTIR fingerprinting data were involved in PCA analysis,and that displayed some dissimilarities in the classification patterns,given the fact that antioxidant activities and chromaticity together could not totally explain the classification based on FTIR fingerprinting between peel and *** of FTIR-ATR spectroscopy to discriminate fig cultivars seems to be a rapid,accurate and cost-effective alternative to laborious measurement techniques,in fig quality screening and preselection,such as chromatog

关键词： Chemometrics FTIR-ATR Ficus carica L. Half maximal inhibitory concentration Multivariate analysis

Chemical composition of essential oils and in vitro antioxidant activity of fresh and dry leaves crude extracts of medicinal plant of Lactuca Sativa *** to sultanate of Oman

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Asian Pacific Journal of Tropical Biomedicine 2013年第5期3卷 353-357页

作者： Rahma said Salim Al Nomaani Mohammad Amzad Hossain Afaf Mohammed Weli Qasim Al-Riyami jamal Nasser Al-Sabahi School of Pharmacy College of Pharmacy and NursingUniversity of Nizwa Central Instrument Laboratory College of Agriculture and Marine SciencesSultan Qaboos University

Objective:To isolate and analyse the chemical composition in the essential oils and free radical scavenging activity of different crude extracts from the fresh and dry leaves of vegetable plants of Lactuca sativa L.(***).Methods:The essential oils and volatile chemical constituents were isolated from the fresh and dry leaves of ***(lettuce)grown in Sultanate of Oman by hydro distillation *** antioxidant activity of the crude extracts was carried out by well established free radical scavenging activity(DPPH)***:About 20 chemical compounds of different concentration representing 83.07%and 79.88%respectively were isolated and identified by gas chromatography-mass spectroscopy in the essential oils isolated from the fresh and dry leaves asα-pinene(5.11%and 4.05%).γ-cymene(2.07%and 1.92%),thymol(11.55%and 10.73%),durenol(52.00%and 49.79%),α-terpinene(1.66%and 1.34%),thymol acetate(0.99%and 0.67%),caryophyllene(2.11%and 1.98%),spathulenol(3.09%and 2.98%).camphene(4.11%and3.65%),limonene(1.28%and 1.11%)representing these major chemical ***,some other minor chemical constituents were also isolated and identified from the essential oil of lettuce including p-pinene,α-terpinolene,linalool,4-terpineol,α-terpineol,o-methylthymol,L-alloaromadendrene and ***:The chemical consliluents in the essential oils from the locally grown lettuce were identified in the following classes or groups of chemical compounds such as monoterpenes,sesquiterpenes volatile organic compounds and their oxygenated ***,the essential oils and the crude extracts from Omani vegetable species of lettuce are active candidates which would be used as antioxidant,antifungal or antimicrobial agents in new drugs preparation for therapy of infectious diseases.

关键词： Lactuca saliva Omani lettuce Clevenger apparatus Essential oil Durenol Thymol Soxhlet extractor Organic crude extracts Antioxidant activity GC-MS analyses

Negative Magnetoresistance Behaviour and Variable Range Hopping Conduction in Insulating NbSi Amorphous Alloys at Very Low Temperature with aagnetic Field

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Journal of Modern Physics 2012年第7期3卷 521-528页

作者： Abdelghani Sybous Abdelhamid El Kaaouachi jamal Hemine Abdelfattah Narjis Lhoussine Limouny said Dlimi Rachid Abdia Gerard Biskupski Laboratoire de Physique de la Matière Condensée Faculté des Sciences et Techniques de Mohammadia Département de Physique Mohammedia Morocco Laboratoire de Spectroscopie Hertzienne LSH Batiment P5 Université des Sciences et Technologies de LilleI 59 655 Villeneuve d’Ascq Cedex France Research Group in ESNPS Physics Department University Ibn Zohr Faculty of Sciences B.P 8106 Hay Dakhla Agadir Morocco

We present results of an experimental study of magnetoresistance (MR) in insulating NbSi amorphous alloys sample showing Variable Range Hopping (VRH) conductivity. The MR is found to be negative in a wide range of low temperature (4.2-20 K) and in the range of moderate magnetic fields (0-4 T). We made tentative analysis using three theoretical models which are the model of quantum interference, the model of Zeeman effect and the model of localized magnetic

关键词： NbSi Amorphous Alloys Negative Magnetoresistance Magnetic Field Localized Magnetic moments Quantum Interference

Studies on free-radical scavenging activity and identification of active ingredients of different plant crude extracts of Mentha piperita collected from Sur,Sultanate of Oman

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Journal of Coastal Life Medicine 2014年第10期 805-810页

作者： Mohammad Amzad Hossain Aqeela said Hamed AL Orimi Afaf Mohammed Weli Qasim Al-Riyami jamal Nasser Al-Sabahi School of Pharmacy College of Pharmacy and NursingUniversity of NizwaP.O.Box 33Postal Code 616NizwaSultanate of Oman Central Instrument Laboratory College of Agricultural and Marine SciencesSultan Qaboos UniversitySultanate of Oman

Objective:To determine free radical scavenging activity and active chemical ingredients of different plant crude extracts of Mentha piperita(***).Methods:The dried powder leaves of *** were extracted with polar organic solvent by Soxhlet *** crude extract and its fractions of hexane,chloroform,ethyl acetate and butanol crude extracts were *** antioxidant activity of different crude extracts from *** was carried out by DPPH method with minor modification,and the active chemical ingredients of different plant crude extracts of *** were analyzed by gas chromatography-mass spectrometry(GC-MS).Results:Qualitative analysis of different polarities crude extracts by GC-MS found different types of active organic *** antioxidant activity of different crude extracts were found to be in the order of chloroform extract>butanol extract>ethyl acetate extract>hexane extract>methanol *** identified compounds in the plant crude extracts by GC-MS were biologically ***:Therefore,the isolation,purification,identification and characterization of bioactive compounds from various crude extracts of *** might have ecological significance.

关键词： Mentha piperita Lamiaceae Crude extracts Antioxidant activity DPPH Gas chromatography-mass spectrometry analysis

Positive Magnetoresistance in Hydrogenated Amorphous Alloys Silicon Nickel a-Si<sub>1-y</sub>Niy:H at Very Low Temperature with Magnetic Field

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Journal of Modern Physics 2012年第6期3卷 447-450页

作者： Abdelfattah Narjis Abdelhamid El kaaouachi jamal Hemine Abdelghani Sybous Lhoussine Limouny said Dlimi Rachid Abdia Gerard Buskipski Laboratoire de Physique de la Matière Condensée Département de Physique Faculté des Sciences et Techniques de Mohammadia Mohammedia Morocco Laboratoire de Spectroscopie Hertzienne LSH Université de LilleI Villeneuve d’Ascq Cedex France Research Group ESNPS Physics Department Faculty of Sciences University Ibn Zohr Agadir Morocco

We present results of an experimental study of magnetoresistance phenomenon in an amorphous silicon-nickel alloys a-Si1-yNiy:H:H (where y = 0.23) on the insulating side of the metal-insulator transition (MIT) in presence of magnetic field up to 4.5 T and at very low temperature. The electrical resistivity is found to follow the Efros-Shklovskii Variable Range Hopping regime (ES VRH) with T -1/2. This behaviour indicates the existence of the Coulomb gap (CG) near the Fermi level.

关键词： Amorphous Silicon-Nickel Alloys a-Si1-yNiy:H Variable Range Hopping Conductivity Metal Insulator Transition Positive Magnetoresistance

Allelopathy of Medicinal Plants: Current Status and Future Prospects in Weed Management

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Agricultural Sciences 2018年第12期9卷 1569-1588页

作者： A. K. M. Mominul Islam Sabina Yeasmin jamal Ragheb said Qasem Abdul Shukor Juraimi Md. Parvez Anwar Weed Management Laboratory Department of Agronomy Bangladesh Agricultural University Mymensingh Bangladesh Department of Agronomy Bangladesh Agricultural University Mymensingh Bangladesh Department of Plant Protection Faculty of Agriculture University of Jordan Amman Jordan Department of Crop Science University of Putra Malaysia Serdang Malaysia

An attempt has been made in this article to accumulate and elucidate the literatures about the allelopathic potentiality of medicinal plants, and its role on the development of bio-herbicides for eco-friendly weed management strategies to conserve bio-diversity and ecological balance. This review paper has been prepared by comprehensive studies of various published research articles, books and proceedings available in the world literature. The farmers of different countries use several weed management techniques in order to minimize the deleterious effect of weeds. Among them most commonly used practice is application of herbicides due to its high efficacy and cost effectiveness, less time-consuming nature, flexibility and easy accessibility, and more rapid out return. Although use of synthetic herbicides in the crop fields has increased the crop production as well as the productivity by reducing the weed infestation, over time it causes a number of environmental hazards. Hence, to avoid these detrimental effects of synthetic herbicide, a lot of efforts have been dedicated by the researchers to search the novel natural plant products mainly allelochemicals and try to apply them as a tool for the development of bio-degradable natural herbicides. This paper intended to reflect the current state of allelopathic medicinal plants and their potentiality to develop eco-friendly and natural product-based herbicides for sustainable agriculture, and to invite further debate on this issue.

关键词： Allelochemicals Medicinal Plants Natural Products Bio-Herbicides Sustainable Weed Management