检索结果-南通市图书馆

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

引用

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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis, Characterization and X-ray Structure of N-(4-bromobutanoyl-N'-(2-3-and 4-methylphenyl)thiourea

引用

Chinese Journal of Structural Chemistry 2015年第3期34卷 379-385页

作者： Hamza M Abosadiya siti aishah Hasbullah Bohari M Yamin School of Chemical Sciences and Food Technology Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia

N-4-（bromobutanoyl）-N＇-（o-, m- and p-tolyl）thioureas 3a, 3b and 3c respectively, were synthesized by the reaction of 4-bromobutanoylisothiocyanate with p-, m- and o-toludine. The products were characterized by IR, and NMR spectroscopic techniques. The two carbonoylthiourea isomers N-（4-bromobutanoyl）-N＇-（3-methylphenyl）thiourea （3b） and N-（4-bromobutanoyl）-N＇-（4- methylphenyl）thiourea （3c） were obtained in crystalline form by recrystallization from DMSO. X- ray crystallographic studies showed that both compounds 3b and 3c crystallize in triclinic system with space group ofPi. The molecules adopt trans-cis configuration with respect to the positions of 4-bromobutanoyl and tolyl groups respectively, against the thiono C=S bond across their C-N bonds The configuration is attributed by the intrahydrogen bond between the carbonyl oxygen and amide hydrogen atoms. Both crystal structures are stabilized by N-H…S intermolecular hydrogen bonds to form dimers and arranged along the b axis.

关键词： 4-bromobutyryl chloride, thiourea derivatives, X-ray structural study

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pest and disease incidence of coniferous species in Taman Saujana Hijau,Putrajaya urban park,Malaysia

引用

Journal of Forestry Research 2023年第6期34卷 2065-2077页

作者： Nura Adila Shamsul Kamar siti Khadijah Abd Rahim Annya Anak Ambrose Norida hanim Awing Zaiton Samdin Aff endy Hassan mohd Nazre Saleh Razak Terhem Laboratory of Forest Pathology and Tree Health Department of Forestry Science and BiodiversityFaculty of Forestry and EnvironmentUniversiti Putra Malaysia UPM43400 SerdangSelangorMalaysia Industrial Forest Research Centre Sarawak Forest Department93250 KuchingSarawakMalaysia Laboratory of Sustainable Bioresource Management(BIOREM) Institute Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia Faculty of Tropical Forestry Universiti Malaysia Sabah88400 Kota KinabaluSabahMalaysia School of Business and Economics Universiti Putra Malaysia43400 SerdangSelangorMalaysia

Taman Saujana Hijau(TSH),Putrajaya is a 41-ha urban park planted with various coniferous species from around the *** pests and disease incidences of this park are unknown and there is a need for an evaluation of the health status of this urban *** study assessed the level of pest and disease incidents of coniferous species in 12 plots of 7 species(Araucaria bidwilii,Araucaria haterophylla,Araucaria cunninghamii,Pinus caribaea,Pinus merkusii,Podocarpus polystachyus,and Podocarpus costalis).Termites,canker disease,and foliar disease are three major *** highest pest and disease incidence(PnDI)was foliar disease with a 0.49 coefficient correlation between the total number of trees and the PnDI,followed by canker disease with 0.40,and termites with *** the seven conifers,*** was the most infected followed by *** and *** was concluded that the incidence of pests and diseases in TSH was *** our knowledge,this may be the first baseline inventory of pests and diseases of coniferous species in Malaysia.

关键词： Canker disease Coniferous species Foliar disease Pest and disease incidence Urban park

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radiative Blood-Based Hybrid Copper-Graphene Nanoliquid Flows along a Source-Heated Leaning Cylinder

引用

Computer Modeling in Engineering & Sciences 2024年第4期139卷 1017-1037页

作者： siti Nur Ainsyah Ghani Noor Fadiya mohd Noor Institute of Mathematical Sciences Faculty of ScienceUniversiti MalayaKuala Lumpur50603Malaysia Center for Data Analytics Consultancy&Services(UM-CDACS) Faculty of ScienceUniversiti MalayaKuala Lumpur50603Malaysia

Variant graphene,graphene oxides(GO),and graphene nanoplatelets(GNP)dispersed in blood-based copper(Cu)nanoliquids over a leaning permeable cylinder are the focus of this *** forms of graphene are highly beneficial in the biological and medical fields for cancer therapy,anti-infection measures,and drug *** non-Newtonian Sutterby(blood-based)hybrid nanoliquid flows are generalized within the context of the Tiwari-Das model to simulate the effects of radiation and heating *** governing partial differential equations are reformulated into a nonlinear set of ordinary differential equations using similar transformational *** equations are then transformed into boundary value problems through a shooting technique,followed by the implementation of the bvp4c tool in *** influences of various parameters on the model’s nondimensional velocity and temperature profiles,reduced skin friction,and reduced Nusselt number are presented for detailed *** results indicated that Cu-GNP/blood and Cu-GO/blood hybrid nanofluids exhibit the lowest and highest velocity distributions,respectively,for increased nanoparticles volume fraction,curvature parameter,Sutterby fluid parameter,Hartmann number,and wall permeability ***,opposite trends are observed for the temperature distribution for all considered parameters,except the mixed convection *** in the reduced skin friction magnitude and the reduced Nusselt number with higher values of graphene/GO/GNP nanoparticle volume fraction are also ***,GNP is identified as the superior heat conductor,with an average increase of approximately 5%and a peak of 7.8%in the reduced Nusselt number compared to graphene and GO nanoparticles in the Cu/blood nanofluids.

关键词： Hybrid nanofluid sutterby fluid tiwari-das model thermal radiation graphene graphene oxides graphene nanoplatelets

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hypoglycemic effect of Octomeles sumatrana aqueous extract in streptozotocin—induced diabetic rats and its molecular mechanisms

引用

Asian Pacific Journal of Tropical Medicine 2012年第11期5卷 875-881页

作者： mohd Aidil Azahar Ghanya Al-Naqeb Mizaton Hasan aishah Adam Faculty of Pharmacy Universiti Teknologi MARAPuncak Alam campusBandar Puncak Alam42300SelangorMalaysia

Objective:To investigate the hypoglycemic effect of the aqueous extract of Octomeles sumatrana (***)(OS) in streptozotocin-induced diabetic rats(STZ) and its molecular mechanisms. Methods:Diabetes was induced by intraperitoneal(i.p.) injection of streptozotocin(55 mg/kg) in to male Sprague-Dawley *** were divided into six different groups;normal control rats were not induced with STZ and served as reference,STZ diabetic control rats were given normal *** groups were treated with OS aqueous extract at 0.2,0.3 and 0.5 g/kg,orally twice daily continuously for 21 *** fifth group was treated with glibenclamide(6 mg/kg) in aqueous solution orally continuously for 21 *** completion of the treatment period,biochemical parameters and expression levels of glucose transporter 2(Slc2a2),glucose-6-phosphatase (GoPase) and phosphoenolpyruvate carboxykinase(PCK1) were determined in liver by quantitative real time ***:Administration of OS at different doses to STZ induced diabetic rats, resulted in significant decrease(P<0.05) in blood glucose level in a dose dependent manner by 36%,48%,and 64%at doses of 0.2,0.3 and 0.5 g/kg,respectively,in comparison to the STZ control *** with OS elicited an increase in the expression level of Slc2a2 gene but reduced the expression of G6Pase and PCK1 ***,OS treated rats,showed significantly lower levels of serum alanine transaminase(ALT),aspartate aminotransferase(AST) and urea levels compared to STZ untreated *** extract at different doses elicited signs of recovery in body weight gain when compared to STZ diabetic controls although food and water consumption were significantly lower in treated groups compared to STZ diabetic control ***:*** aqueous extract is beneficial for improvement of hyperglycemia by increasing gene expression of liver Slc2a2 and reducing expression of G6Pase and PCK1 genes in streptozotocin-induced diabetic rats.

关键词： Octomeles sumatrana Aqueous extract Antioxidant Oxidative stress STZ-induced diabetic rats Gene expression

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of Hibiscus sabdariffa Linn. fruit extracts on α-glucosidase enzyme,glucose diffusion and wound healing activities

引用

Asian Pacific Journal of Tropical Biomedicine 2017年第5期7卷 466-472页

作者： Raheem Mohssin Shadhan siti Pauliena mohd Bohari Department of Biotechnology and Medical Engineering Faculty of Biosciences and Medical EngineeringUniversiti Teknologi Malaysia81310UTMJohor BahruJohorMalaysia

Objective:To provide in vitro evidence for antidiabetic activity through potential inhibition of α-glucosidase enzyme,glucose diffusion and enhancement in the wound healing using methanolic extract and fractions from Hibiscus sabdariffa ***:The inhibitory action of methanolic extract and fractions of such fruit on aglucosidase enzyme and glucose movement through in vitro assay assessment was *** activities on wound healing were tested using the scratch ***:Ethyl acetate fraction at 50 mg/m L concentration exhibited significant aglucosidase inhibition(95.79 mg/m L) with P sitively.

关键词： α-Glucosidase Glucose diffusion Wound healing Hibiscus sabdariffa Linn

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Latent tuberculosis infection among medical students in Malaysia

引用

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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Notch-δ-doped InP Gunn diodes for low-THz band applications

引用

Journal of Electronic Science and Technology 2023年第2期21卷 30-43页

作者： Duu Sheng Ong siti Amiera mohd Akhbar Kan Yeep Choo Faculty of Engineering Multimedia UniversityCyberjaya63100Malaysia

The viability of the indium phosphide(InP)Gunn diode as a source for low-THz band applications is analyzed based on a notch-δ-doped structure using the Monte Carlo *** presence of theδ-doped layer could enhance the current harmonic amplitude(A0)and the fundamental operating frequency(f0)of the InP Gunn diode beyond 300 GHz as compared with the conventional notch-doped structure for a 600-nm length *** its superior electron transport properties,the notch-δ-doped InP Gunn diodes outperform the corresponding gallium arsenide(GaAs)diodes with up to 1.35 times higher in f0 and 2.4 times larger in A0 under DC *** optimized InP notch-δ-doped structure is estimated to be capable of generating 0.32-W radio-frequency(RF)power at 361 *** Monte Carlo simulations predict a reduction of 44%in RF power,when the device temperature is increased from 300 K to 500 K;however,its operating frequency lies at 280 GHz which is within the low-THz *** shows that the notch-δ-doped InP Gunn diode is a highly promising signal source for low-THz sensors,which are in a high demand in the autonomous vehicle industry.

关键词： Gunn diode δ-doped Monte Carlo Indium phosphide(InP) Terahertz source

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modified 2 Satisfiability Reverse Analysis Method via Logical Permutation Operator

引用

Computers, Materials & Continua 2023年第2期74卷 2853-2870页

作者： siti Zulaikha mohd Jamaludin mohdAsyraf Mansor Aslina Baharum mohd Shareduwan mohd Kasihmuddin Habibah A.Wahab Muhammad Fadhil Marsani School of Mathematical Sciences Universiti Sains MalaysiaMindenPenang11800Malaysia School of Distance Education Universiti Sains MalaysiaMindenPenang11800Malaysia Faculty of Computing and Informatics Universiti Malaysia SabahJalan UMSKota Kinabalu88450SabahMalaysia School of Pharmaceutical Sciences Universiti Sains MalaysiaMindenPenang11800Malaysia

The effectiveness of the logic mining approach is strongly correlated to the quality of the induced logical representation that represent the behaviour of the ***,the optimum induced logical representation indicates the capability of the logic mining approach in generalizing the real datasets of different variants and *** main issues with the logic extracted by the standard logic mining techniques are lack of interpretability and the weakness in terms of the structural and arrangement of the 2 Satisfiability logic causing lower *** address the issues,the logical permutation serves as an alternative mechanism that can enhance the probability of the 2 Satisfiability logical rule becoming true by utilizing the definitive finite arrangement of *** work aims to examine and analyze the significant effect of logical permutation on the performance of data extraction ability of the logic mining approach incorporated with the recurrent discrete Hopfield Neural *** on the theory,the effect of permutation and associate memories in recurrent Hopfield Neural Network will potentially improve the accuracy of the existing logic mining *** validate the impact of the logical permutation on the retrieval phase of the logic mining model,the proposed work is experimentally tested on a different class of the benchmark real datasets ranging from the multivariate and timeseries *** experimental results show the significant improvement in the proposed logical permutation-based logic mining according to the domains such as compatibility,accuracy,and competitiveness as opposed to the plethora of standard 2 Satisfiability Reverse Analysis methods.

关键词： Logic mining logical permutation discrete hopfield neural network knowledge extraction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Simulations of One-Directional Fractional Pharmacokinetics Model

引用

Computers, Materials & Continua 2022年第12期73卷 4923-4934页

作者： Nursyazwani Mohamad Noor siti Ainor mohd Yatim Nur Intan Raihana Ruhaiyem School of Distance Education Universiti Sains MalaysiaUSM PenangPenang11800Malaysia School of Computer Science Universiti Sains MalaysiaUSM PenangPenang11800Malaysia

In this paper,we present a three-compartment of pharmacokinetics model with irreversible rate *** compartment consists of arterial blood,tissues and venous ***’s principle and the law of mass action were used to develop the model based on the diffusion *** model is modified into a fractional pharmacokinetics model with the sense of Caputo *** existence and uniqueness of the model are investigated and the positivity of the model is *** behaviour of the model is investigated by implementing numerical algorithms for the numerical solution of the system of fractional differential *** software is used to plot the graphs for illustrating the variation of drug concentration concerning ***,the numerical simulations of the model are presented for different values ofαwhich verified the theoretical ***,we also observed the pattern of the simulations at the three-compartment of the model by using different values of initial conditions.

关键词： Pharmacokinetics model Irreversible rate Fractional order Numerical simulations

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：