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Comparative investigation of the free radical scavenging potential and anticancer property of diospyros blancoi(Ebenaceae)

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Asian Pacific j.urnal of Tropical Biomedicine 2016年第5期6卷 410-417页

作者： Muhammad Ali Khan Mahbubur Rahman Nazmul Sardar Saiful Islam Arman Badrul Islam j.hangir Alam Khandakar Mamunur Rashid Golam Sadik ahm Khurshid Alam Department of Pharmacy Bangabandhu Sheikh Mujibur Rahman Science and Technology University Department of Pharmacy University of Rajshahi Drugs and Toxins Research division Bangladesh Council of Scientific and Industrial Research Product Development and Validation Department Square Pharmaceutical Limited Laboratory of Genetics Graduate School of BiostudiesKyoto University

Obj.ctive: To investigate the comparative effects of diospyros blancoi(Ebenaceae)leaves(DBL), root bark(DBRB) and stem bark(DBSB) on free radicals and ***: The polyphenol contents, antioxidant and free radical scavenging properties were determined using standard spectrophotometric methods. Cytotoxicity and anticancer activities were performed on brine shrimp nauplii and Ehrlich ascite carcinoma cells, ***: Among the extracts, DBSB showed the highest total antioxidant capacity and reducing capacity on ferrous ion. Based on 1,1-diphenyl-2-picrylhydrazyl and hydroxyl radical scavenging activities, DBSB showed(95.760 ± 0.343)% and(67.460 ± 2.641)%scavenging with IC50of(3.10 ± 0.17) and(50.00 ± 3.11) mg/m L, respectively. The IC50 values of standard butylated hydroxytoluene and catechin(CA) for 1,1-diphenyl-2-picrylhydrazyl and hydroxyl radicals were(8.50 ± 0.25) and(75.00 ± 0.14) mg/m L,respectively suggesting that DBSB had a significant(P dical scavenging activity than standards. In lipid peroxidation inhibition assay, the inhibitory activity of the extracts and the standard was in the following order: DBSB > DBRB > CA > ***, the phenolic [(139.91 ± 3.924) mg gallic acid equivalent/g] and flavonoid contents[(412.00 ± 16.70) mg catechin equivalent/g)] of DBSB were higher than that of other extracts. In addition, the DBSB showed the moderate cytotoxic and anticancer ***: Our results indicate that diospyros blancoi stem bark had the significant highest antioxidant and free radical scavenging properties as well as moderate anticancer ***, we assume that the anticancer activity of this plant can be, at least in part, attributed to its content in phenolic compounds as well as its significant free radical scavenging properties.

关键词： diospyros blancoi Free radicals Polyphenols Antioxidant Cytotoxicity Anticancer

Glass formation for iron-based alloys by combining kinetic and thermodynamic parameters

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j.urnal of Central South University 2013年第2期20卷 293-300页

作者： j. H. Willy 王刚刘仲武 School of Materials Science and Engineering South China University of Technology

The glass formation was intensively studied for Fe-based alloys. Parameters defining kinetics and thermodynamic behavior of crystallization were calculated using calorimetric measurements and physical properties of constituent elements. It is found that the critical cooling rate Rc estimated by combining kinetic and thermodynamic parameters highly correlates with measured Rc found in literatures with correlation coefficient R2=0.944, and alloy compositions with high melting enthalpy ahm can easily form glass even without high undercooling and high value of the ,β-parameter of Tumbull＇s theory, revealing that the glass formation in this group of alloys is mostly controlled by growth limitation. This combination of kinetic and thermodynamic parameters can be used to determine alloy composition with good glass forming ability in Fe-based alloys j.st using physical properties of alloying elements and calorimetric measurements.

关键词： metallic glass glass-forming ability iron-based alloys critical cooling rate

漂浮绿藻中缘管浒苔(Ulva linza)鉴定方法的探索(英文)

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华东师范大学学报（自然科学版） 2013年第5期 71-79页

作者：陈斌斌马家海 SHIN j.ng-ahm 高嵩上海海洋大学农业部水产种质资源发掘利用重点实验室上海201306 全南大学校水产海洋大学韩国丽水市556-901

以研究漂浮绿藻中的缘管浒苔(Ulva linza)为出发点,根据绿藻的形态学特征,选取漂浮绿藻中具有***重要特征的藻体进行形态学、分子生物学的分类学研究.结果显示,具有***重要特征的漂浮藻体大多为LPP复合体(***-procera-prolifera)类群(1... 详细信息

以研究漂浮绿藻中的缘管浒苔(Ulva linza)为出发点,根据绿藻的形态学特征,选取漂浮绿藻中具有***重要特征的藻体进行形态学、分子生物学的分类学研究.结果显示,具有***重要特征的漂浮藻体大多为LPP复合体(***-procera-prolifera)类群(15个样品),而且采自江苏的DF05、山东的QD03以及浙江的XS01、XS02等4个固着类型的样品也在该分支中.Ulva flexuosa分支中有2个样品(均为采自福建的固着种类),Ulva compressa分枝包含了如东的4个漂浮样品.采自如东内河、射阳沿海池塘的漂浮藻体也均被包含在LPP复合体中.25个样品中只有4个被鉴定为***,与其形态特征研究结果相符合.漂浮绿藻的形态学特征与分子生物学研究结果存在很大差别.这说明单纯地依靠传统分类学特征或分子生物学手段对漂浮绿藻中的缘管浒苔(***)进行分类是不可取的,甚至对漂浮绿藻都不能适用.在同一地点采集到的漂浮绿藻中,大都存在不同形态特征的类型,经过分子生物学分析后被鉴定为不同的种类.根据ITS序列的系统进化树分析结果,绿潮藻中至少存在LPP复合体中的种类以及***.

关键词：绿潮缘管浒苔形态学 ITS 分子生物学

一种经氟化和热处理在双壁碳纳米管上生成缺陷的方法(英文)

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催化学报 2014年第6期35卷 864-868页

作者： Hiroyuki Muramatsu Kazunori Fuj.sawa Yong-Il Ko Kap-Seung Yang Takuya Hayashi Morinobu Endo Cheol-Min Yang Yong Chae j.ng Yoong ahm Kim Faculty of Engineering Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan School of Polymer Science and Engineering Chonnam National University 77 Yongbong-ro Buk-gu 500-757 Gwangju Korea Institute of Carbon Science and Technology Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan Institute of Advanced Composite Materials Korea Institute of Science and Technology Chudong-ro 92 Bongdong-eup Wanju-gun Jeonbuk 565-905 Korea

Nanoscale defects in the outer tube to preserve the electrical and optical features of the inner tube can be engineered to exploit the intrinsic properties of double walled carbon nanotubes (DWCNTs) for various promising applications. We demonstrated a selective way to make defects in the outer tube by the fluorination of DWCNTs followed by the thermal detachment of the F atoms at 1000 °C in argon. Fluorinated DWCNTs with different amounts of F atoms were prepared by reacting with fluorine gas at 25, 200, and 400 °C that gave the stoichiometry of CF0.20, CF0.30, and CF0.43, respectively. At the three different temperatures used, we observed preservation of the coaxial morphology in the fluorinated DWCNTs. For the DWCNTs fluorinated at 25 and 200 °C, the strong radial breathing modes (RBMs) of the inner tube and weakened RBMs of the outer tube indicated selective fluorine attachment onto the outer tube. However, the disappearance of the RBMs in the Raman spectrum of the DWCNTs fluorinated at 400 °C showed the introduction of F atoms onto both inner and outer tubes. There was no significant change in the morphology and optical properties when the DWCNTs fluorinated at 25 and 200 °C were thermally treated at 1000 °C in argon. However, in the case of the DWCNTs fluorinated at 400 °C, the recovery of strong RBMs from the inner tube and weakened RBMs from the outer tube indicated the selective introduction of substantial defects on the outer tube while preserving the original tubular shape. The thermal detachment of F atoms from fluorinated DWCNTs is an efficient way to make highly defective outer tubes for preserving the electrical conduction and optical activity of the inner tubes.

关键词：双壁碳纳米管热处理氟化缺陷光学特性 F原子化学计量呼吸模式

Hydrodeoxygenation of Phenolic Model Compounds over MoS2 Catalysts with different Structures

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Chinese j.urnal of Chemical Engineering 2008年第5期16卷 733-739页

作者：杨运泉罗和安童刚生 Kevin j. Smith TYE Ching Thian Department of Chemical Engineering Xiangtan University Xiangtan 411105 China Department of Chemical and Biological Engineering University of British Columbia Vancouver B.C V6T 1Z3 Canada

Several MoS2 catalysts of different structure, prepared by in situ decomposition of ammonium heptamolybdate （ahm） and molybdenum naphthenate （MoNaph）, and by MoS2 exfoliation （TDM）, were characterized by BET, X-ray diffraction （XRD）, Energy dispersive X-ray （EDX） and transmission electron microscopy （TEM）. The analysis showed that MoS2 structure was dependant upon the preparation procedure. The activity of the catalysts was determined by measuring the hydrodeoxygenation （HDO） of phenol, 4-methylphenol and 4-methoxyphenol using a batch autoclave reactor operated at 2.8 MPa of hydrogen and temperatures ranging from 320-370℃. By comparing the conversion, the reactivity order of the catalysts was： ahm〉TDM-D〉MoNaph〉thermal〉MoS2 powder〉 TDM-W. Also, the effect of reaction temperature on the HDO conversion was explained in terms of equilibrium of reversible reaction kinetics. The main products of the HDO for phenolic compounds were identified by gas chromatography/mass spectrometry （GC/MS）. The results showed that the product distribution and the HDO selectivity were correlated with the reaction temperature. Two parallel reaction routes, direct hydrogenolysis and combined hydrogenation-hydrogenolysis, were confirmed by the analysis of the product distribution. High temperature favored hydrogenolysis over hydrogenation for HDO of phenol and 4-methoxyphenol, whereas for 4-methylphenol the reverse was true.

关键词： ammonium heptamolybdate derived MoS2 structure effect characterization hydrodeoxygenation reactivity product distribution

Semi-analytical finite element method applied for characterizing micropolar fibrous composites

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Applied Mathematics and Mechanics(English Edition) 2024年第12期45卷 2147-2164页

作者： j.A.OTERO Y.ESPINOSA-ALMEYDA R.RODRíGUEZ-RAMOS j.MEROdiO School of Engineering and Sciences Monterrey Institute of Technology Institute of Engineering and Technology Autonomous University of Ciudad Juárez Postgraduate Program in Computational Modeling in Science and Technology Federal Fluminense University Faculty of Mathematics and Computer Science University of Havana Department of Mathematics Applied to ICT School of Informatics Systems Engineering Technical University of Madrid

A semi-analytical finite element method(SAFEM), based on the two-scale asymptotic homogenization method(ahm) and the finite element method(FEM), is implemented to obtain the effective properties of two-phase fiber-reinforced composites(FRCs). The fibers are periodically distributed and unidirectionally aligned in a homogeneous matrix. This framework addresses the static linear elastic micropolar problem through partial differential equations, subj.ct to boundary conditions and perfect interface contact conditions. The mathematical formulation of the local problems and the effective coefficients are presented by the ahm. The local problems obtained from the ahm are solved by the FEM, which is denoted as the SAFEM. The numerical results are provided, and the accuracy of the solutions is analyzed, indicating that the formulas and results obtained with the SAFEM may serve as the reference points for validating the outcomes of experimental and numerical computations.

关键词： 74Q05 74Q15 74S05 asymptotic homogenization method (ahm) effective property fiber-reinforced composite (FRC) finite element method (FEM) micropolar elasticity O241.82 O343 semi-analytical approach

Estimation of Metformin Drug for the diabetes Patients by Simple,Quick and Cheap Techniques within the Formation of Colored Charge Transfer Complexes

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光谱学与光谱分析 2018年第11期38卷 3622-3630页

作者： Omar B.Ibrahim El-Sayed A.Manaaa M.M.AL-Maj.houb ahm ed M.Fallatah Abdel Maj.d A.Adam Mha M.Alatibi j.han Y.A l-Humaidi Moamen S.Refat Department of Chemistry Faculty of ScienceTaif UniversityAl-HaweiahP.O.Box 888Zip Code 21974TaifSaudi Arabia Department of Chemistry Faculty of Applied Medical ScienceTaif Unive rsityKSA Nuclear Materials Authority El-MaadiEgypt Department of Chemistry College of SciencePrincess Nourah bint Abdulrahman UniversityRiyadh 11671KSA Department of Chemistry Faculty of SciencePort Said UniversityPort SaidEgypt

Metformin(Met)is a drug developed for the treatment of patients with typeⅡ ***,Met estimation in pharmaceutical formulations and human fluids has gained a growing *** extend requisite data that can be used to assessment of Met quantitatively based on charge-transfer(CT)complexation,the present study describes the synthesis and characterization of CT complexes that formed between drug Met and the organicπ-acceptors picric acid(PA),chloranilic acid(CLA),chloranil(CHL),7,7',8,8'-tetracyanoquinodimethane(TCNQ),and dichlorodicyanobenzoquinone(DDQ).The properties of the formed CT complexes were investigated by elemental,spectral(UV-visible,IR,and Raman spectroscopies),thermal(TG)and morphological(SEM)*** results indicated that the complexation of Met with either PA or CLA acceptors occurs through proton transfer interaction,whereas its complexation with CHL,TCNQ,or DDQ acceptors occurs through n→π*interaction.

关键词： Metformin Anti-diabetic drug Charge-t ransfer complex Acceptor Solution study

破产法律制度改革建构若干问题的研讨——ahm方案的启示

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经济问题探索 2005年第6期 129-131页

作者：谭泰山宋笛云南大学法学院昆明650091

本文针对我国破产法律制度的改革,从美国的阿格海恩(Aghion)、哈特(Hart)和穆尔(Moore)三位法经济学家在上一世纪90年代中期所提出的破产法律制度改革方案——ahm方案入手,对我国破产法律制度的现状和建构进行了有益的探讨,提出了自己... 详细信息

本文针对我国破产法律制度的改革,从美国的阿格海恩(Aghion)、哈特(Hart)和穆尔(Moore)三位法经济学家在上一世纪90年代中期所提出的破产法律制度改革方案——ahm方案入手,对我国破产法律制度的现状和建构进行了有益的探讨,提出了自己的一些见解。

关键词：法律制度改革建构破产法律制度研讨 90年代中期改革方案经济学家哈特见解

基于属性层次模型的人促红素注射液合理性评价

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现代药物与临床 2024年第8期39卷 2142-2147页

作者：岳云月狄潘潘夏茹楠李帅王志远贾淑云梁海安徽医科大学附属亳州医院药学部安徽亳州236800

目的建立人促红素注射液(rhEPO)合理性评价体系,分析目前临床使用过程中存在的问题,为临床合理用药提供参考。方法以rhEPO的说明书为基础,参考相关专家共识和指南制定用药合理性评价标准。根据入排标准随机抽取安徽医科大学附属亳州医院... 详细信息

目的建立人促红素注射液(rhEPO)合理性评价体系,分析目前临床使用过程中存在的问题,为临床合理用药提供参考。方法以rhEPO的说明书为基础,参考相关专家共识和指南制定用药合理性评价标准。根据入排标准随机抽取安徽医科大学附属亳州医院2023年4月—2024年4月使用rhEPO的归档病历,应用属性层次模型(ahm)法对其进行合理性评价,并与传统点评方法进行一致性检验,确定ahm法的可行性。结果372份病历中,病历评分(MRS)≥90分156例(占比41.94%),75分≤MRSahm法一致率为90.59%(Kappa=0.785,Pahm法建立的rhEPO评价体系切实可行,评价结果显示本院rhEPO使用存在不合理现象,医院需在适应证、用药或停药时机、用药剂量及用药调整等方面进一步规范、合理使用。

关键词：人促红素注射液合理性评价属性层次模型一致性检验适应证