检索结果-南通市图书馆

Sorption of 1-naphthol by plant cuticular fractions

Journal of Environmental Sciences 2007年第10期19卷 1214-1220页

作者： CHEN Bao-liang LI yun-gui Department of Environmental Science Zhejiang University Hangzhou 310028 China

The contribution of aliphatic-rich plant biopolymer to sorption of hydrophobic organic compounds is significantly important because of their preservation and accumulation in the soil environment, but sorption mechanism is still not fully understood. In this study, sorption of 1-naphthol by plant cuticular fractions was examined to better understand the contributions of respective fraction. Toward this end, cuticular materials were isolated from the fruits of tomato by chemical method. The tomato cuticle sheet consisted of waxes （6.5 wt%）, cuticular monomer （69.5 wt%）, and polysaccharide （24.0 wt%）. Isotherms of 1-naphthol to the cuticular fractions were nonlinear （N value （0.82 - 0.90）） at the whole tested concentration ranges. The K∞/Kow ratios for bulk cuticle （TC1）, dewaxed cuticle （TC2）, cutin （TC4）, and desugared cuticle （TC5） were larger than unity, suggested that tomato bulk cuticle and cutin are much powerful sorption medium. Sorption capability of cutin （TC4） was 2.4 times higher than the nonsaponifiable fraction （TC3）. The 1-naphthol interactions with tomato cuticular materials were governed by both hydrophobic-type interactions and polar （H-bonding） interactions. Removal of the wax and polysaccharide materials from the bulk tomato cuticle caused a significant increase in the sorption ability of the cuticular material. There was a linear negative trend between K∞ values and the amount of polysaccharides or fraction＇s polarities （（N＋O）/C）; while a linear positive relationship between K∞ values and the content ofcutin monomer （linear R^2 = 0.993） was observed for present in the cuticular fractions. Predominant sorbent of the hydrophobic organic compounds （HOCs） in the plant cuticular fraction was the cutin monomer, contributing to 91.7% of the total sorption of tomato bulk cuticle.

关键词： plant cuticle 1-naphthol sorption cutin monomer

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

Positional and Quantitative Characterization of the Hydroxyethyl Groups in Hydroxyethyl Starch by GC/MS or NMR

引用

Chinese Chemical Letters 2002年第11期13卷 1097-1099页

作者： Ye Min LIU gui yun XU Center for Molecular Science Institute of ChemistryChinese Academy of SciencesBeijing 100080

The position and quantity of the hydroxyethyl groups in hydroxyethyl starch (HES) were studied by GC/MS and NMR. Quantitative characterization was carried out based on the results of both methods.

关键词： Hydroxyethyl starch GC/MS NMR.

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

Endogenous DNA Damage and Repair Enzymes—A short summary of the scientific achievements of Tomas Lindahl,Nobel Laureate in Chemistry 2015

引用

Genomics, Proteomics & Bioinformatics 2016年第3期14卷 122-125页

作者： Arne Klungland yun-gui Yang Department of Microbiology Division of Diagnostics and InterventionInstitute of Clinical MedicineOslo University Hospital Department of Molecular Medicine Faculty of MedicineInstitute of Basic Medical SciencesUniversity of Oslo CAS Key Laboratory of Genomic and Precision Medicine Collaborative Innovation Center of Genetics and DevelopmentBeijing Institute of GenomicsChinese Academy of Sciences

Tomas Lindahl completed his medical studies at Karolinska Institute in ***,his work has always been dedicated to unraveling fundamental mechanisms of DNA decay and DNA *** research is characterized with groundbreaking discoveries on the instability of our genome,the identification of novel DNA repair activities,the characterization of DNA repair pathways,and the association to diseases,throughout his 40 years of scientific career.

关键词： DNA repair completed career instability decay dedicated summary Clare breaking

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

Base-excision repair and beyond—A short summary attributed to scientific achievements of Tomas Lindahl, Nobel Prize Laureate in Chemistry 2015

引用

Science China(Life Sciences) 2016年第1期59卷 89-92页

作者： Shuangli Mi Arne Klungland yun-gui Yang Key Laboratory of Genomic and Precision Medicine Collaborative Innovation Center of Genetics and Development CAS Center for Excellence in Molecular Cell Science Beijing Institute of Genomics Chinese Academy of Sciences Department of Microbiology Division of Diagnostics and Intervention Institute of Clinical Medicine Oslo University HospitalRikshospitalet Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo

Tomas Lindahl contributed his scientific career to unveiling fundamental mechanisms of DNA decay and repair. He made several ground-breaking discoveries on genome in- stability, novel DNA repair activities and pathway... 详细信息

关键词：碱基切除修复诺贝尔奖得主托马斯科学成果归结化学科学生涯修复机制

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

Escape Rate in the Bistable Sawtooth System Driven by Correlated Multiplicative and Additive White Noises

引用

Chinese Physics Letters 2001年第2期18卷 175-177页

作者： YOU Jing-yun CAO Li WU Da-Jin LIANG gui-yun State Key Laboratory of Laser Technology Huazhong University of Science and TechnologyWuhan 430074 CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Department of Physics Huazhong University of Science and TechnologyWuhan 430074

We study the escape problem of a bistable sawtooth system driven by correlated multiplicative and additive white *** analytic representation of the relative escape rate is *** novel phenomena are found from the calculation result;“suppression platform”appears in the relative escape rate when the noise correlation coefficientλis ***,for small positive values ofλ,the relative escape rate exhibits“suppression platform”and then“resonant activation”with the increasing noise strength ratio R.

关键词： sawtooth noise activation

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

Electrocrystallizations of copper on glassy carbon in CuCl_2 silica sol and aqueous solutions

引用

Chinese Chemical Letters 2012年第2期23卷 249-252页

作者： Yan Yan Feng Min Gu yun gui Du State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqing 400044China

Electrocrystallizations of copper from both CuCl_2 silica sol and aqueous solutions were studied by the chronoamperometry *** was found that current density contributions of the double-layer charging（iDL） in current-time transients（CTTs） from both of the solutions were *** adsorption-nucleation based model was proposed to analyze quantitatively the CTTs,by which copper electrocrystallization mechanism was characterized as progressive nucleation with 3D growth（3DP） under diffusion *** diffusion coefficient of copper ions and the AN_∞products in aqueous solutions were larger than that in silica sols, which indicated that copper nucleation was inhibited in sol *** large iDL may be resulted from the adsorption of chloride ions on the electrode surface.

关键词： CuCl_2 Silica sol Aqueous Current-time transients(CTTs) Copper Electrocrystallization

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

Selective Acid Hydrolysis Condition for the Composition and Linkage with a Fructofuranosyl Backbone of a Polysaccharide from Angelica sinensis (Oliv) Diels

引用

Chinese Chemical Letters 2006年第10期17卷 1369-1372页

作者： gui yun XU Yang CHEN Ru Xian CHEN Institute of Chemistry Chinese Academy of Sciences Beijing 100080 Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences Beijing 100050

A new polysaccharide was extracted and purified from the roots of Angelica sinensis （Oliv） Diels （ASD）. Its composition and linkage was elucidated by selective hydrolysis and GC/MS analysis of its derivatives. The polysaccharide was made of → 1） Fruf（2→and→6） Glcp （l→as its backbone with highly branched structure. To our best knowledge, this is the first report of the fructose residue in polysaccharides from the roots of the ASD.

关键词： Selective hydrolysis fructofuranosyl backbone GC/MS

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

1:13 phase formation mechanism and first-order magnetic transition strengthening characteristics in(La,Ce)Fe13–xSix alloys

引用

Rare Metals 2016年第9期35卷 691-700页

作者： Xiang Chen yun-gui Chen Yong-Bo Tang Ding-Quan Xiao College of Engineering and Technology Neijiang Teachers Normal UniversityNeijiang 641002China School of Materials Science and Engineering Sichuan UniversityChengdu 610065China

The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,*** results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,*** substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,*** to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear *** maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.

关键词： La1-xCexFe1 5Si1 5alloys Short-time annealing Large magnetocaloric effect Magnetocaloric materials

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

A Characterization of Almost Simple K_3-groups

引用

Acta Mathematica Sinica,English Series 2015年第11期31卷 1739-1750页

作者： Yan Xiong YAN Hai Jing XU gui yun CHEN School of Mathematics and Statistics Southwest University Faculty of Education Southwest University

It is a well-known fact that characters of a finite group can give important information about the group＇s structure. Also it was proved by the third author of this article that a finite simple group can be uniquely determined by its character table. Here the authors attempt to investigate how to characterize a finite almost simple group by using less information of its character table, and successfully characterize the almost simple K3-groups by their orders and at most three irreducible character degrees of their character tables.

关键词： Finite group irreducible character character degree simple group

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

On Coprime G-conjugacy Class Sizes in a Normal Subgroup

引用

Acta Mathematica Sinica,English Series 2014年第9期30卷 1588-1594页

作者： Xian He ZHAO Hai Peng QU gui yun CHEN College of Mathematics and Information Science He 'nan Normal University Xinxiang 453007 P. R. China Department of Mathematics Shanxi Normal University Linfen 041004 P. R. China School of Mathematics and Statistics Southwest University Chongqing 400715 P. R. China

Let N be a normal subgroup of a group G. Suppose that the positive integers m 〉 n are two longest non-central G-conjugacy class sizes of N with （m, n） = 1. The purpose of this paper is to determine the structure of... 详细信息

关键词： Normal subgroups G-conjugacyclass sizes Frobenius group

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

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：