检索结果-南通市图书馆

Enhanced urease inhibition activity of Ag nanomaterials capped with N-substituted methyl 5-acetamido-β-resorcylate

Progress in Natural Science:Materials International 2019年第2期29卷 129-137页

作者： syeda Sohaila Naz Muhammad Raza Shah Nazar Ul Islam syed sartaj alam Nanosciences and Technology Department National Centre for Physics Quaid-i-Azam University Campus ICCBS H.E.J.Research Institute of Chemistry University of Karachi Institute of Chemical Sciences University of Peshawar Sarhad University of Science and Information Technology Department of Plant Pathology The University of AgriculturePeshawar Pakistan

Medically, bacterial ureases are important virulent factors and are used for treatment of peptic ulcers and urinary tones. Reported urease inhibitors are associated with various side effects including antibiotic resistance as a major one. Still there is an urgent need to synthesize new urease inhibitors. In this context we have synthesized new urease inhibitor i.e. AgL that is composed of Ag nanomaterials capped with N-substituted methyl 5-acetamido-β-resorcylate(L). The conjugation of L to silver was confirmed through FTIR, UV–vis and TEM *** silver nanomaterials(Ag) were also prepared. The stability of AgL nanostructures was determined against various parameters(temperature, high salt concentration, pH) and found to be stable. The in vitro antimicrobial(antibacterial, antifungal), enzyme inhibition(xanthine oxidase, urease, carbonic anhydrase, α-chymotrypsin,cholinesterase) and antioxidant activities of AgL were investigated and compared with Ag, L and standard *** comparison to other bioactivities, AgL shows statistically enhanced selective enzyme inhibition activity against urease enzyme. Urease inhibition activity of AgL was significantly greater than standard drug(thiourea),L and Ag. On a per weight basis, AgL required about 11–18 times less amount of L for inhibition of urease enzyme.

关键词： β-Resorcylic acid N-Substituted methyl 5-acetamido-β-resorcylate Silver nanomaterials Enhanced urease inhibition activity

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Letter to editor‘prognostic significance of hepatic encephalopathy in patients with cirrhosis treated with Rifaxamin’

引用

World Journal of Gastroenterology 2020年第44期26卷 7085-7087页

作者： Amera Elzubeir syed Munawer alam Department of Gastroenterology Norfolk and Norwich University HospitalNorwich NR46AYNorfolkUnited Kingdom

The present letter to editor is related to Bohra A et al Prognostic significance of hepatic encephalopathy in patients with cirrhosis treated with current standards of *** J Gastroenterol 2020;26(18):*** encephalopathy(HE)is a significant and frequent major decompensating event in *** clinical studies examining the clinical outcome of HE are lacking despite its high prevalence.

关键词： Hepatic encephalopathy Cirrhosis Rifaxamin Portal hypertension Acute on chronic liver failure Prognosis

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

Corrosion resistance and thermal stability of sputtered Fe44Al34Ti7N15 and Al61Ti11N28 thin films for prospective application in oil and gas industry

引用

Progress in Natural Science:Materials International 2021年第5期31卷 688-697页

作者： Mahbub alam Maruf syed Muhammad Mujtaba Rizvi Mohammed Noor-A-alam Donghyun Shin Waseem Haider Ishraq Shabib School of Engineering and Technology Central Michigan University Mechanical Engineering Indiana University-Purdue University Columbus

Fe-and Al-based thin-film metallic glass coatings(Fe44Al34Ti7N15and Al61Ti11N28) were fabricated using magnetron co-sputtering technique, and their corrosion performances compared against wrought 316 L stainless steel. The results of GI-XRD and XPS analyses demonstrated amorphous structure and oxide layer formation on the surface of the fabricated thin films, respectively. The potentiodynamic(PD) polarization test in chloridethiosulfate(NH4Cl + Na2S2O3) solution revealed lower corrosion current(Icorr)(0.42 ± 0.02 μA/cm~2 and0.086 ± 0.001 μA/cm~2 Vs. 0.76 ± 0.05 μA/cm~2), lower passivation current(Ipass)(1.45 ± 0.03 μA/cm~2 and1.83 ± 0.07 μA/cm~2 Vs. 1.98 ± 0.04 μA/cm~2), and approximately six-fold higher breakdown potential(Ebd) for Fe-and Al-based coatings than those of wrought 316 L stainless steel. Electrochemical Impedance Spectroscopy(EIS) of both films showed 4-and 2-fold higher charge transfer resistance(Rct), 7-and 2.5-times higher film resistance(Rf), lower film capacitance values(Qf)(10 ± 2.4 μS-sacm-2, and 5.41 ± 0.8 μS-sacm-2Vs. 18 ± 2.21 μSsacm-2), and lower double-layer capacitance values(Qdl)(31.33 ± 4.74 μS-sacm-2, and 15.3 ± 0.48 μS-sacm-2Vs.43 ± 4.23 μS-sacm-2), indicating higher corrosion resistance of the thin films. Cyclic Voltammetry(CV) scan exhibited that the passive films formed on the Fe-and Al-based coatings were more stable and less prone to pitting corrosion than the wrought 316 L stainless steel. The surface morphology of both films via SEM endorsed the CV scan results, showing better resistance to pitting corrosion. Furthermore, the thermal analysis via TGA and DSC revealed the excellent thermal stability of the thin films over a wide temperature range typically observed in oilgas industries.

关键词： Thin films Metallic glasses X-ray diffraction Photoelectron spectroscopy Corrosion Thermal analysis

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Parametic Model for Optimization of Battery Capacity and Power Transmitters of On-line Electric Vehicles in Closed/Open Environments

引用

CSEE Journal of Power and Energy Systems 2023年第1期9卷 185-196页

作者： Fatima Nisar syed Haider Imtiaz alam Asad Waqar Toqeer Ahmed Mudassar Usman Department of Electrical Engineering School of Engineering&Applied Sciences(BSEAS)Bahria UniversityIslamabadPakistan Department of Centre for Advanced Electronics and Photovoltaic Engineering(CAEPE) International Islamic Universityand School of Interdisciplinary Engineering and Science(SINES)National University of Science and Technology(NUST)IslamabadPakistan

An on-line electric vehicle(OLEV)uses a wireless charging phenomenon,in which power transmitters are installed beneath the road and the OLEV’s battery is charged *** paper deals with the optimization of two key economic and design parameters,i.e.,the size of the battery and the power transmitters allocation.A complete model configuration of the OLEV system,including the vehicle design and power transmitter,is implemented using MATLAB/*** battery’s state of charge(SOC)rises and drops according to the vehicle’s velocity and power collection and *** mixed integer programming(MIP)model is used for cost ***,with the help of the SOC graph and MIP model,the battery size and the number of power transmitters,along with their placements,are *** proposed model is applicable to both closed and open environments as it accepts both regulated and deregulated *** test cases are performed for this *** first test case deals with regulated velocity for which we have applied the KAIST campus OLEV’s velocity along with its 13 kWh battery size and 4 power transmitters,and then applied the suggested solution with the same velocity and route i.e.,8 power transmitters with shorter lengths and reduced battery size(3.25 kWh;one-fourth of the first case).SOC is found within limits at the end of the route,saving$1600 and validating the proposed model in this *** the second test case,we use deregulated velocity and optimize both parameters,using the same approach.

关键词： Closed and open environments mixed integer programming on-line electrical vehicle power transmitters state of charge wireless charging

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

A novel (G'/G)-expansion method and its application to the Boussinesq equation

引用

Chinese Physics B 2014年第2期23卷 34-43页

作者： Md.Nur alam Md.Ali Akbar syed Tauseef Mohyud-Din Department of Mathematics Pabna University of Science and Technology Department of Applied Mathematics University of Rajshahi Department of Mathematics HITEC UniversityTaxila Cantt

In this article, a novel （G＇/G）-expansion method is proposed to search for the traveling wave solutions of nonlinear evolution equations. We construct abundant traveling wave solutions involving parameters to the Boussinesq equation by means of the suggested method. The performance of the method is reliable and useful, and gives more general exact solutions than the existing methods. The new （G＇/G）-expansion method provides not only more general forms of solutions but also cuspon, peakon, soliton, and periodic waves.

关键词： (G'/G)-expansion method Boussinesq equation solitary wave solutions auxiliary nonlinear ordinary differential equation

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

Decoding molecular mechanisms:brain aging and Alzheimer's disease

引用

Neural Regeneration Research 2025年第8期20卷 2279-2299页

作者： Mahnoor Hayat Rafay Ali syed Hammad Qaiser Mohammad Uzair Khalid Al-Regaiey Roaa Khallaf Lubna Abdullah Mohammed Albassam Imdad Kaleem Xueyi Wang Ran Wang Mehwish SBhatti Shahid Bashir Atta-ur-Rahman School of Applied Biosciences(ASAB) National University of Sciences and Technology(NUST)IslamabadPakistan Department of Biotechnology Quaid-i-Azam UniversityIslamabadPakistan Department of Biological Sciences Faculty of Basic&Applied SciencesInternational Islamic University Islamabad(IIUI)IslamabadPakistan Department of Bioengineering King Fahd University of Petroleum and MineralsDhahranSaudi Arabia Department of Physiology College of MedicineKing Saud UniversityRiyadhSaudi Arabia Department of Neurology Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Mental Health Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Biosciences Commission on Science and Technology for Sustainable Development in the South(COMSATS University)IslamabadPakistan Department of Psychiatry The First Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Mental Health Institute of Hebei Medical University ShijiazhuangHebei ProvinceChina Department of Neurobiology and Behavior University of CaliforniaIrvineCAUSA Neuroscience Center King Fahad Specialist Hospital DammamDammamSaudi Arabia

The complex morphological,anatomical,physiological,and chemical mechanisms within the aging brain have been the hot topic of research for *** aging process alters the brain structure that affects functions and cognitions,but the worsening of such processes contributes to the pathogenesis of neurodegenerative disorders,such as Alzheimer's *** these observable,mild morphological shifts,significant functional modifications in neurotransmission and neuronal activity critically influence the aging *** these changes is important for maintaining cognitive health,especially given the increasing prevalence of age-related conditions that affect *** review aims to explore the age-induced changes in brain plasticity and molecular processes,differentiating normal aging from the pathogenesis of Alzheimer's disease,thereby providing insights into predicting the risk of dementia,particularly Alzheimer's disease.

关键词： Alzheimer’s disease brain aging cognitive health dementia molecular mechanisms neuronal activity neuroplasticity neurotransmission

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

Chemical modification of acetaminophen：PASS assisted in vivo antiinflammatory activity of chalcones,flavanones and Schiff bases

引用

Journal of Chinese Pharmaceutical Sciences 2017年第8期26卷 611-620页

作者： syed Misbahul Hasan Shah alam Khan Kavita Golani Jaswinder Lamba Aftab Ahmad Asif Husain Department of Pharmaceutical Chemistry School of Pharmaceutical Education and Research Jamia Hamdard (Hamdard University)New Delhi 110062 India Faculty of Pharmacy Integral University Lucknow UP 226026 India Department of Pharmacy Oman Medical College PO Box 620 Postal code-130 Muscat Sultanate of Oman Health Information Technology Department Jeddah Community College King Abdulaziz University deddah Kingdom of Saudi Arabia

In the present study,synthetic chalcones,flavanones and Schiff bases were prepared starting from paraceamol,and evaluated their anticipated anti-inflammatory *** were synthesized by reacting 3-acetyl-4-hydroxy acetanilide and aromatic aldehydes in alcoholic potassium hydroxide(KOH) solution under Claisen-Schmidt condensation *** chalcones were cyclized in the presence of piperidine in isoamyl alcohol to obtain flavonone *** bases were synthesized by condensing 3-acetyl-4-hydroxy anilines with aromatic aldehydes in the presence of *** Schiff bases were further reacted with other aromatic aldehydes in alcoholic KOH *** cheminformatics software was used to predict the anti-inflammatory activity of synthesized *** software predicted that chalcone-based Schiff bases 6a–d contained structural features that can exhibit anti-inflammatory *** the prepared derivatives of acetaminophen exhibited moderate to excellent in vivo anti-inflammatory activity in carrageenan-induced edema in rat *** the Schiff bases coupled chalcones showed good anti-inflammatory activity compared with the reference drug,*** evaluation of their therapeutic potential and safety profile is required in the future study.

关键词： p-Acetaminophen Anti-inflammatory Chalcone Flavanone

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

Cardiac amyloidosis: state-of-the-art review

引用

Journal of Geriatric Cardiology 2023年第5期20卷 361-375页

作者： syed Bukhari Department of Medicine Temple University HospitalPhiladelphiaPAUSA

Cardiac amyloidosis(CA)is caused by deposition of amyloid fibrils in the myocardium and has two main sub-types,transthyretin cardiac amyloidosis(ATTR)and immunoglobulin light chain cardiac amyloidosis(AL).ATTR is further dif-ferentiated into wild-type(wtATTR)and hereditary(hATTR),depending on the absence or presence of mutation in the trans-thyretin *** increased recognition of disease with the improvement in diagnostic armamentarium and serendipitous ad-vancements in the therapeutic landscape have changed the status of CA from being a rare and untreatable disease to being a not-so-rare and treatable *** ATTR and AL have certain clinical aspects that can provide early clues for the *** electrocardiography followed by echocardiography and subsequently cardiac magnetic resonance can raise suspicion for CA,the definitive diagnosis of ATTR is non-invasively established by bone scintigraphy while that of AL always needs histological *** of CA can be gauged by serum biomarker-based staging of both ATTR and *** therapies work by silen-cing or stabilizing TTR or by degrading amyloid fibrils,while AL is managed with anti-plasma cell therapies and autologous stem cell transplant.

关键词： amyloid Cardiac diagnosis

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

Survey and technological analysis of laser and its defense applications

引用

Defence Technology（防务技术） 2021年第2期17卷 583-592页

作者： syed Affan Ahmed Mujahid Mohsin syed Muhammad Zubair Ali Department of Avionics Engineering-College of Aeronautical Engineering(CAE) National University of Sciences and Technology(NUST)RisalpurKPKPakistan

The laser technology has made remarkable progress over the past couple of *** is being widely employed in diverse domains,such as holography,space sciences,spectroscopy,medical sciences,micro and power electronics,industrial engineering,and most distinctively,as directed energy military *** to their active transmissions,laser systems are similar to microwave radars to some extent;however,unlike conventional radars,the laser operates at very high frequencies thus making it a potent enabler of narrow-beam and high energy aerial deployments,both in offensive and defensive *** modern avionics systems,laser target indicators and beam riders are the most common devices that are used to direct the Laser Guided Weapons(LGW)accurately to the ground ***,compact size and outstanding angular resolution of laser-based systems motivate their use for drones and unmanned aerial ***,the narrow-beam divergence of laser emissions offers a low probability of intercept,making it a suitable contender for secure transmissions and safety-critical ***,the developments in space sciences and laser technology have given synergistic potential outcomes to use laser systems in space *** paper comprehensively reviews laser applications and projects for strategic defense actions on the ground or in ***,a detailed analysis has been done on recent advancements of the laser technology for target indicators and *** also reviews the advancements in the field of laser communications for surveillance,its earlier state of the art,and ongoing scientific research and advancements in the domain of high energy directed laser weapons that have revolutionized the evolving military *** offering a comprehensive taxonomy,the paper also critically analyzes some of the recent contributions in the associated domains.

关键词： Laser systems Laser military applications Directed energy weapons Non-lethal weapons Laser military projects Survey Taxonomy

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

Assessing Biomass Expansion Factor of Birch Tree <i>Betula utilis</i>D. DON

引用

Open Journal of Forestry 2014年第3期4卷 181-190页

作者： Khurshid alam syed Moazzam Nizami Department of Forestry & Range Management Arid Agriculture University Rawalpindi Pakistan

Biomass is the component of living organism and mostly obtained from plants, animals, insects and the residue of all the mentioned organisms. Biomass is the key source of energy present in the form of organic matter. The study aimed to find out biomass and its variation in each component of Betula utilis D. Don (Birch Tree) with varying diameter at Kalam forest division Swat, Khyber Pakhtunkhwa (KPK) province, Pakistan. The biomass of different components was determined by non-destructive methods. Overall, 30 trees were selected from different diameter classes viz a viz up to 10, 11 - 20 and greater than 20 cm. Ten trees were selected from each class. The diameter of stem and large branches and their length were measured in the field. Later, the volumes of stem and branches were calculated and converted into biomass. The study revealed that stem contributes 42.65% biomass followed by large and sub branches as 39.22% and 13.54% respectively. Leaves contribute 4.59% only. The above tree biomass contribution by different components was arranged as stem was greater than large branches;these were greater than sub branches and the lowest was in leaves. The total above ground biomass of single tree was 20.59, 58.041 and 197.214 kg·tree-1 respectively for diameter up to 10, 11 - 20 and greater than 20 cm. The averaged biomass in all diameter classes was 91.95 ± 93.064 kg·tree-1. The total biomass of single tree of diameter class up to 10, 11 - 20 and greater than 20 cm was 24.71, 69.649 and 236 kg respectively. The below ground biomass of single tree of diameter class up to 10, 11 - 20 and greater than 20 cm was 4.11 ± 1.24 kg, 11.61 ± 3.56 kg and 39.44 ± 8.9 kg respectively. The biomass expansion factor was 1.34, 1.47, and 1.5 t·m-3 respectively for diameter classes up to 10 cm, 11 - 20 cm and greater than 20 cm respectively. The mean biomass expansion factor for all diameter classes was 1.44 t·m-3.

关键词： Biomass Allocation Biomass Expansion Factor Birch Tree

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：