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Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies

Journal of Natural Gas Chemistry 2012年第1期21卷 29-36页

作者： Muhammad Arif Ab Aziz Nur Hidayatul Nazirah Kamarudin Herma Dina Setiabudi Halimaton Hamdan aishah Abdul Jalil Sugeng Triwahyono Department of Chemical Engineering Faculty of Chemical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Ibnu Sina Institute for Fundamental Science Studies Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia

Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2＋/N,N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740-3500 cm-1, Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm-1 and the sharp band at 3740 cm-1 with simultaneous development of new absorbance band at 3700 cm-1 that was attributed to （-OH）Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups （terminal- and structural-defect OH groups）. The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn＇t exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.

关键词： Ni.Ni/PtHY n-pentane isomerization hydrogen protonic acid sites

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mRNA transcriptome profiling of human hepatocellular carcinoma cells HepG2 treated with Catharanthus roseus-silver nanoparticles

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World Journal of Hepatology 2023年第3期15卷 393-409页

作者： Nur Asna Azhar Siti aishah Abu Bakar Marimuthu Citartan Nor Hazwani Ahmad Department of Biomedical Science Advanced Medical and Dental InstituteUniversiti Sains MalaysiaKepala Batas 13200Pulau PinangMalaysia Liver Malignancies Research Program Advanced Medical and Dental InstituteUniversiti Sains MalaysiaKepala Batas 13200Pulau PinangMalaysia Faculty of Bioresources and Food Industry Universiti Sultan Zainal AbidinBesut CampusBesut 22200TerengganuMalaysia

BACKGROUND The demand for the development of cancer nanomedicine has increased due to its great therapeutic value that can overcome the limitations of conventional cancer ***,the presence of various bioactive compounds in crude plant extracts used for the synthesis of silver nanoparticles(AgNPs)makes its precise mechanisms of action *** To assessed the mRNA transcriptome profiling of human HepG2 cells exposed to Catharanthus roseus ***(***)-*** The proliferative activity of hepatocellular carcinoma(HepG2)and normal human liver(THLE3)cells treated with *** were measured using MTT *** RNA samples were extracted and sequenced using BGIseq500 *** is followed by data filtering,mapping,gene expression analysis,differentially expression genes analysis,Gene Ontology analysis,and pathway *** The mean IC 50 values of *** on HepG2 was 4.38±1.59μg/mL while on THLE3 cells was 800±1.55μg/*** profiling revealed an alteration of 296 *** induced the expression of stress-associated genes such as MT,HSP and *** signalling pathways were potentially activated through MAPK,TNF and TGF pathways that are responsible for apoptosis and cell cycle *** alteration of ARF6,EHD2,FGFR3,RhoA,EEA1,VPS28,VPS25,and TSG101 indicated the uptake of ***-AgNPs via both clathrin-dependent and clathrinindependent *** This study provides new insights into gene expression study of biosynthesised AgNPs on cancer *** cytotoxicity effect is mediated by the aberrant gene alteration,and more interestingly the unique selective antiproliferative properties indicate the *** as an ideal anticancer candidate.

关键词： Catharanthus roseus HepG2 Silver nanoparticles Transcriptome oxidative stress Apoptosis Cell cycle

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Solution of Laguerre’s Differential Equations via Modified Adomian Decomposition Method

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Journal of Applied Mathematics and Physics 2023年第1期11卷 85-100页

作者： Mariam Al-Mazmumy aishah A. Alsulami Department of Mathematics Faculty of Science University of Jeddah Jeddah Saudi Arabia

This paper presents a technique for obtaining an exact solution for the well-known Laguerre’s differential equations that arise in the modeling of several phenomena in quantum mechanics and engineering. We utilize an efficient procedure based on the modified Adomian decomposition method to obtain closed-form solutions of the Laguerre’s and the associated Laguerre’s differential equations. The proposed technique makes sense as the attitudes of the acquired solutions towards the neighboring singular points are correctly taken care of.

关键词： Modification Method Singular Ordinary Differential Equations Laguerre’s Equation Associated Laguerre’s Equation

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Carbon Dioxide Fixation Method for Electrosynthesis of Benzoic Acid from Chlorobenzene

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Journal of Natural Gas Chemistry 2007年第3期16卷 273-277页

作者： A.J.aishah M.A.Hartini S.Normala A.M.Norhuda H.H.N Hanis H.M.Razif T.Sugeng Faculty of Chemical and Natural Resowrces Engineering Ibnu Sina Institute for Fundamental Science Studies Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia.

Carbon dioxide fixation technique was developed as an alternative dechlorination method of chlorobenzenes. Electrolysis of chlorobenzene was carried out in a one-compartment cell fitted with an aluminium anode and a platinum cathode. Electrolysis in N, N-dimethylformamide （DMF） solution containing 0.1 M of tetrapropylammonium bromide （TPAB） at 0 ℃, 100 ml/min of CO2 flow rate and 120 mA/cm^2 of current density was found to be the optimum conditions of this electrocarboxylation, which gave 72% yield of benzoic acid from chlorobenzene. These conditions were then applied to 1,2-dichlorobenzene and 1,3-dichlorobenzene in order to convert them to their corrcsponding benzoic acids.

关键词： carbon dioxide fixation method electrosynthesis chlorobenzene benzoic acid

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Eco-friendly method for synthesis of zeolitic imidazolate framework 8 decorated graphene oxide for antibacterial activity enhancement

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Particuology 2020年第2期18卷 24-32页

作者： Nazerah Ahmad Nik Abdul Hadi Md Nordin Juhana Jaafar Nik Ahmad Nizam Nik Malek Ahmad Fauzi Ismail Muhammad Nabil Fikri Yahya Siti aishah Mohd Hanim Mohd Sohaimi Abdullah Advanced Membrane Technology Research Centre Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Malaysian Institute of Chemical Engineering Technology-Universiti Kuala Lumpur Lot 1988Bandar VendorTaboh Naning78000 Alor GajahMelakaMalaysia Chemical Engineering Department Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia Centre for Student Innovation and Technology Entrepreneurship Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

We report a rapid method for synthesis of zeolitic imidazolate framework 8(ZIF-8)-decorated graphene oxide(GO)composites(ZGO)with good antibacterial *** ZGO composites were synthesized at room temperature with low GO to metal salt *** samples were characterized by X-ray diffraction,transmission electron microscopy,Fourier transform infrared spectroscopy,thermal gravimetric analysis,and surface area *** characterization results show that ZIF-8 with a size of approximately 120 nm is successfully decorated on the surface of GO sheets with the host ZIF-8 framework maintained in the synthesized composite,but there is a significant reduction in the Brunauer-Emmett-Teller surface *** antibacterial activities of the samples against Escherichia coli ATCC 11229 and Staphylococcus aureus ATCC 6538 as model strains of gram-negative and-positive bacteria,respectively,were determined by disc diffusion and minimum inhibitory concentration(MIC)***-1.0(1 wt%of ratio of GO to metal salt)shows the highest antibacterial activity with MIC values required to inhibit bacterial growth of *** and *** of 5 times lower than those of pristine *** antibacterial mechanisms are proposed based on field-emission scanning electron microscope images of the two bacteria after contact with the synthesized ***,owing to the simple synthesis,good stability,low chemical usage,and excellent antibacterial activity of the ZGO composites,they show great potential for application in the field of microbial contamination control.

关键词： Graphene oxide Metal-organic framework Hybrid nanocomposite Zeolitic imidazolate framework Antibacterial agent

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Principal Component Analysis （PCA） on Multivariate Data of Lard Analysis in Cooking Oil

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Journal of Mathematics and System Science 2015年第7期5卷 300-306页

作者： Nor aishah Mohd Salleh Mohd Sukri Hassan Faculty of Science and Technology Universiti Sains Islam Malaysia (USIM) Bandar Baru Nilai 71800 Nilai Negeri SembilanMalaysia. Institute of Halal Research & Management (IHRAM) Universiti Sains Islam Malaysia (USIM) Bandar Baru Nilai 71800 NilaiNegeri Sembilan Malaysia.

Discrimination of fatty acids （FAs） of lard in used cooking oil is important in halal determination. The aim of this study was to find the information related to the changes FAs of lard when frying in cooking oil. Quantitative analysis of FAs composition extracted from a series of experiments which involving frying cooking oil spiked with lard at three different parameters; concentration of spiked lard, heating temperatures and period of frying. The samples were analyzed using Gas Chromatography （GC） and Principal Components Analysis （PCA） technique. Multivariate data from chromatograms of FAs were standardized and computed using Unscrambler X10 into covariance matrix and eigenvectors correspond to Principal Components （PCs）. Results have shown that the first and second PCs contribute to the FAs mapping which can be visualized by scores and loading plots to discriminate FAs of lard in used cooking oil

关键词： Fatty acids lard gas chromatography Principal Components Analysis

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Aquatic Ecosystem and Biodiversity: A Review

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Open Journal of Ecology 2019年第1期9卷 1-13页

作者： Sufia Irfan aishah Mohammed Motir Alatawi Biology Department Faculty of Science College of Science University of Tabuk Tabuk KSA

Aquatic ecosystems support a substantial source of the earth’s biological diversity. They are an essential reservoir and share an enormous proportion of earth’s biological productivity. Both aquatic resources and its biodiversity are interrelated to each other and they perform a myriad of functions and are valuable and essential for the sustainability of biotic communities. Aquatic biodiversity in both freshwater and marine environments are under continuous decline because of overexploitation of species, introduced exotic plant or animal, pollution sources from cities, industries and agricultural zones, loss and changes in ecological niche. Their conservation and management in the form of bio reserve points and bioregional management and worldwide monitoring are needed for the protection of the aquatic biodiversity. This review is presenting information on biodiversity in aquatic habitats and their resources, in marine and fresh water ecosystems, their importance conservation and restoration mechanisms.

关键词： Aquatic Ecosystem Biodiversity Conservation Restoration

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Latent tuberculosis infection among medical students in Malaysia

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Asian Pacific Journal of Tropical Medicine 2019年第4期12卷 181-184页

作者： Maha Abdullah Ummi Nadira Daut Siti aishah Daud Nor Afifi Mohd Romli Marsitah Abdul Jalil Noorelina Muhammad Safarina Mohammad Ismuddin Masriana Hassan Department of Pathology Faculty of Medicine and Health Sciences Universiti Putra Malaysia

Objective: This study aimed to determine prevalence of latent tuberculosis infection among medical students and tuberculosis exposure at the health facilities. Methods: A cross-section of study year 1(n=68) and year 5(n=75) medical students in a local university were recruited for latent tuberculosis infection testing using QuantiFERON-TB Gold Plus and a questionnaire analyzed for multivariate risk. Results: The majority of the study were vaccinated with BCG. None of year 1 medical students were positive for latent tuberculosis infection, however, six(8.0%) year 5 students were tested positive for latent tuberculosis infection. A higher incidence of year 5 medical students claimed to be exposed to tuberculosis at health facility(65.3% vs. 4.4%) and a higher percentage reported contact with tuberculosis case over the preceding year compared to year 1 students(30.7% vs. 8.8%). Conclusion: We observed a higher incidence of latent tuberculosis infection and higher exposure to tuberculosis in health facilities among year 5 medical students. Baseline screening and monitoring for progression to tuberculosis infection may benefit tuberculosis management programs.

关键词： Latent tuberculosis infection Medical students Interferon-gamma release assay

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On the Application of Adomian Decomposition Method to Special Equations in Physical Sciences

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American Journal of Computational Mathematics 2023年第3期13卷 387-397页

作者： aishah Alsulami Mariam Al-Mazmumy Huda Bakodah Nawal Alzaid Department of Mathematics College of Science University of Jeddah Jeddah Saudi Arabia

The current manuscript makes use of the prominent iterative procedure, called the Adomian Decomposition Method (ADM), to tackle some important special differential equations. The equations of curiosity in this study are the singular equations that arise in many physical science applications. Thus, through the application of the ADM, a generalized recursive scheme was successfully derived and further utilized to obtain closed-form solutions for the models under consideration. The method is, indeed, fascinating as respective exact analytical solutions are accurately acquired with only a small number of iterations.

关键词： Iterative Scheme Adomian Decomposition Method Initial-Value Problems Singular Ordinary Differential Equations

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Reforming of Greenhouse Gas into Syngas over Ni-Ce/Al2O3 in a Dielectric Barrier Plasma Reactor

Reforming of Greenhouse Gas into Syngas over Ni-Ce/Al2O3 in ...

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2012年等离子体催化与能源材料应用国际研讨会

作者： Maryam khoshtinat Nikoo Nor aishah Saidina Amin Department of Catalyst and Process R&D of Bandar Imam Petrochemical Complex (BIPC)Mahshahr Iran Chemical Reaction Engineering Group(CREG) Faculty of Chemical and Natural Resources Engineering Universiti Teknologi MalaysiaUTM 81310 Skudai JohorMalaysia

＜正＞The activation of CO2 and CH4 was conducted at atmospheric pressure and lowtemperature in a DBD plasma reactor for syngas production. The influences of CO2/CH4 ratios, reactant flow rate, gap spacing, and input power, frequency onreactant conversions and products distribution as well as energy efficiency werestudied. According to the results, H2/CO ratio, the selectivity of H2 and CO

关键词： Methane conversion carbon dioxide DBD non-thermal plasma catalytic-plasma.

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