检索结果-南通市图书馆

Evaluation of genetically modified rice detection methods 2011/884/EU and 2008/289/EC proposed by the European Union

引用

Journal of Integrative Agriculture 2016年第12期15卷 2899-2910页

作者： XIAO Qi-sheng XU Wen-tao YANG Jie-lin PAN Liang-wen Technical center for Animal Plant and Food Inspection and QuarantineShanghai Entry and Exit Inspection and Quarantine Bureau College of Food Science & Technology Shanghai Ocean University Beijing Laboratory for Food quality and Safety/College of Food Science and Nutritional Engineering China Agricultural University

Increases in the number of cases of identified genetically modified （GM） rice contamination can be traced back to the first Rapid Alert System for Food and Feed （RASFF） in 2006. In response to the lack of reliable detection methods, Decision 2011/884/EU proposed that new screening methods replace Decision 2008/289/EC, to identify all possible GM rice products originating in China. However, the synergy brands （SYBR） Green real-time PCR assay proposed by Decision 2011/884/EU has been shown to lack conformity with other TaqMan methods currently in use. To evaluate the specificity and repeatability of the methods recommended in Decision 2011/884/EU and Decision 2008/289/EC, we collected 74 rice products originating from six countries or districts. The 74 rice samples were tested using the Decision 2011/884/EU and Decision 2008/289/ EC methods. The parallel use of different instruments and reagents were used for testing in parallel, and the results were analyzed statistically. To avoid the limitations of specific laboratories, eight GM organism detection laboratories in China participated in a collaborative trial. In our tests, 24.3% （18/74） of the samples tested were positive with the SYBR Green real-time PCR assay using the Decision 2011/884/EU method, but were negative with the TaqMan real-time PCR assay using the Decision 2011/884/EU and Decision 2008/289/EC methods. Sequencing the PCR-amplified CrylA（b/c） genes in three samples （6, 30 and 43） showed that the products consisted of primer dimers rather than the targeted sequence. The combined experimental results showed that testing for the nopaline synthase gene （NOS） of Agrobacterium tumefasciens terminator and CrylA（b/c） produced false-positive results when the Decision 2011/884/EU method was used. Because of the high rate of false-positive results, the Decision 2011/884/EU SYBR Green method to detect GM rice requires improvement.

关键词： genetically modified organism Decision 2011/884/EU SYBIR Green real-time PCR false positive

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

Atomistic simulations on adhesive contact of single crystal Cu and wear behavior of Cu-Zn alloy

引用

Chinese Physics B 2021年第2期30卷 442-448页

作者： You-Jun Ye Le Qin Jing Li Lin Liu Ling-Kang Wu national quality Supervision and inspection center of Pressure Pipe Components Special Equipment Safety Supervision Inspection Institute of Jiangsu ProvinceNanjing 210036China School of Mechanical Engineering Changzhou UniversityChangzhou 213164China Jiangsu Power Equipment Co. LtdChangzhou 213000China School of Material Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332-0245USA

Atomistic simulations are carried out to investigate the nano-indentation of single crystal Cu and the sliding of the Cu-Zn *** the contact zone is extended due to adhesive interaction between the contact atoms,the contact area on a nanoscale is redefined.A comparison of contact area and contact force between molecular dynamics(MD)and contact theory based on Greenwood-Williamson(GW)model is *** roughness causes the adhesive interaction to weaken,showing the better consistency between the calculated results by MD and those from the theoretical *** simulations of the sliding show that the substrate wear decreases with the mol%of Zn increasing,due to the fact that the diffusion movements of Zn atoms in substrate are blocked during the sliding because of the hexagonal close packed(hcp)structure of Zn.

关键词： atomistic simulation nano-indentation wear behavior

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

Properties and Structure of Multi-walled Carbon Nanotubes/Cellulose Composites Fibers Using Ionic Liquid as Solvent

引用

Journal of Donghua University(English Edition) 2011年第6期28卷 591-594页

作者：蔡涛杨瑜榕王明葵张慧慧 national Textile and Garment quality Supervision Testing center Fiber inspection Bureau of Fujian Province State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University

To take advantage of cellulose material and prepare a kind of high performance fiber,multi-walled carbon nanotubes(MWNTs) were used as fillers to produce MWNTs/cellulose composite fibers using ionic liquid as *** thermal properties,mechanical properties,and structure of the composite fibers were *** wide angle X-ray diffraction(WAXD) measurements show that MWNTs/cellulose composite fibers have cellulose Ⅱ crystal *** results obtained from thermal gravimetric analysis(TGA) indicate that the addition of low nanotubes amounts leads to an increase in the degrade *** tensile mechanical properties show that initial modulus and tensile strength considerably increase in the presence of nanotubes with a maximum for 66.7% and 22.7%.

关键词： carbon nanotubes ionic liquid composite fiber mechanical properties

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

Effects of Exogenousα-Ketoglutaric Acid on 2-Acetyl-1-Pyrroline,Yield Formation and Grain quality Characters of Aromatic Rice

引用

Phyton-International Journal of Experimental Botany 2021年第2期90卷 437-447页

作者： Bin Du Qixia Wu Shuochen Jiang Dingyue Zhang Yue Qiao Yimei Xie Jianlong Xu Jianqiang Zhu College of Agriculture Yangtze UniversityJingzhou434023China national Selenium-Rich Product quality Supervision and inspection center Enshi434023China Institute of Crop Science Chinese Academy of Agricultural SciencesBeijing100081China

The improvement of grain quality in aromatic rice is very important for farmer to increase their *** study was conducted with a two-year field experiment and three aromatic rice cultivars in order to study the effects of exogenousα-ketoglutaric acid on yield formation,grain quality characters and the biosynthesis of 2-acetyl-1-pyrroline(2-AP,key component of aromatic rice’s fragrance)in aromatic *** heading stage,0.50 mmol L^(-1)(T1)and 1.00 mmol L^(-1)(T2)α-ketoglutaric acid solutions were overhead sprinkle to aromatic rice plants,respectively while the treatment which was overhead sprinkled with distilled water was set as control(CK).The results showed that 17.34%-33.04%and 21.39%-34.74%higher grain 2-AP contents were recorded in T1 and T2 treatments,*** with CK,T1 and T2 treatments significantly reduced the transcript level of gene BADH2 which is related to the 2-AP biosynthesis in aromatic rice.3.86%-7.51%higher grain protein contents and 1.15%-3.37%higher head rice rates were also recorded inα-ketoglutaric acid treatments than ***,T1 and T2 treatments remarkably decreased the chalky rice rate,chalkiness and grain amylose ***,there was no remarkable difference in grain yield and related trails(effective panicle number,grain number per panicle,seed-setting rate and 1000-grain weight)among CK,T1 and T2 *** conclusion,application of exogenousα-ketoglutaric acid enhanced 2-AP biosynthesis and improved grain quality of aromatic rice.

关键词： α-ketoglutaric acid aromatic rice chalkiness protein 2-acetyl-1-pyrroline

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 and Crystal Structure of (2-Iodo-5-nitrophenyl)-[1-(1-methylazepan-3-yl)-1H-indol-3-yl]methanone

引用

Chinese Journal of Structural Chemistry 2013年第7期32卷 1100-1104页

作者：李志伟李江胜康绍英刘卫东吴道新曹忠 Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation Changsha University of Science and Technology Hunan Institute of Food quality Supervision inspection and Research national Engineering Research center for Agrochemicals Hunan Research Institute of Chemical Industry

The title compound （2-iodo-5-nitrophenyl）-[1-（1-methylazepan-3-yl）-lH-indol-3- yl]methanone （C22H22IN303, Mr- 503.07 ） was synthesized by the reaction of 3-（2-iodo-5- nitrobenzoyl）indole with 2-chloromethyl-1-methylpiperidine. Its chemical structure was determined by 1H NMR, 13C NMR, DEPT, COSY, HMQC, HMBC, HRMS and X-ray single-crystal diffraction. The crystal belongs to the triclmic system, space group P1 with a = 9.153（4）, b = 10.409（3）, c = 11.882（4） A, a = 71.84（3）, β = 78.67（3）, ）, = 75.49（3）°, V = 1032.7（6） A3, Z = 2, Dc= 1.619 g/era3, = 1.579 mm-1, F（000） = 504, R = 0.0270 and wR = 0.0498 for 3634 observed reflections with I 〉 20（/）. X-ray analysis shows that the indole ring forms a dihedral angle of 84.57（12）° with the iodobenzene ring and the azepane ring adopts a twisted chair conformation. Weak C-H...O hydrogen bonding contributes to the stability and packing of the structure.

关键词： synthesis crystal structure aminoalkylindoles azepane

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 tunable lighting system integrated by inorganic and transparent organic light-emitting diodes

引用

Optoelectronics Letters 2014年第3期10卷 198-201页

作者：张晶晶张涛金亚方刘石神袁士东崔钊张立王伟辉 Shanghai Institute of Technical Physics Chinese Academy of Sciences national center for quality inspection & Supervision of LED Product Changzhou Institute of Opto-Electronic Technology School of Electronic and Optical Engineering Nanjing University of Science and Technology

A tunable surface-emitting integrated lighting system is constructed using a combination of inorganic light-emitting diodes(LEDs) and transparent organic LEDs(OLEDs).An RB two-color LED is used to supply red and blue light emission,and a green organic LED is used to supply green light *** of the LED and OLED are tuned to produce a white color,showing different Commission Internationale d'Eclairage(CIE) chromaticity coordinates and correlated color temperatures with a wide adjustable *** an integration can compensate for the lack of the LED's luminance uniformity and the transparent OLED's luminance intensity.

关键词：有机发光二极管照明系统集成可调无机国际照明委员会 OLED 亮度均匀性

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

Changes in fruit pigment accumulation,chloroplast development,and transcriptome analysis in the CRISPR/Cas9-mediated knockout of Stay-green 1(slsgr1)mutant

引用

Food quality and Safety 2022年第1期6卷 3-12页

作者： Liqun Ma Ni Zeng Ke Cheng Jinyan Li Keru Wang Chunjiao Zhang Hongliang Zhu College of Food Science and Nutritional Engineering China Agricultural UniversityBeijingChina Supervision Inspection&Testing Center of Agricultural Products QualityMinistry of Agriculture and Rural AffairsBeijingChina

The green-flesh(gf)mutant of the tomato fruit ripen to a muddy brown color and has been demonstrated previously to be a loss-of-function ***,we provide more evidence to support this view that S/SGR1 is involved in color change in ripening tomato *** out SISGR1 expression using a clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9 genome editing strategy showed obviously a muddy brown color with significantly higher chlorophyll and carotenoid content compared with wild-type(WT)*** further verify the role of SiSGR1 in fruit color change,we performed transcriptome deep sequencing(RNA-seq)analysis,where a total of 354 differentially expressed genes(124/230 downregulated/upregulated)were identified between WT and ***,the expression of numerous genes associated with photosynthesis and chloroplast function changed significantly when S/SGR1 was knocked *** together,these results indicate that S/SGR1 is involved in color change in ripening fruit via chlorophyll degradation and carotenoid biosynthesis.

关键词： Tomato pigmentaccumulation transcriptome analysis

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 of a Novel Solid Acid with both Sulfonic and Carbonyl Acid Groups and Its Catalytic Activities in Acetalization

引用

Chinese Journal of Chemical Engineering 2014年第3期22卷 312-317页

作者：程欲晓周宇艳张继东费旭东马腾洲梁学正 inspection center of Industrial Products and Raw Materials Shanghai Entry-Exit Inspection and Quarantine Bu-reau Institute of Applied Chemistry Shaoxing University

The novel solid acid with both sulfonic and carbonyl acid groups has been synthesized from 3-((2-sulfoethoxy) carbonyl)acrylic acid and tetraethyl orthosilicate(TEOS). The catalytic activities were investigated through the acetalization. The results showed that the novel solid acid was very efficient for the reactions with the high yields. The high acidity, high stability and reusability were the key feature of the novel solid acid. Moreover, the sulfonic and carbonyl acid groups could cooperate during the catalytic process, which improved its catalytic activities. The catalyst shows recyclability, and hold great potential for replacement of homogeneous catalysts.

关键词： solid acid with sulfonic and carbonyl acid groups acetalization green chemistry

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

Supramolecular Self-assembly Behaviors of Asymmetric Diblock Copolymer Blends with Hydrogen Bonding Interactions between Shorter Blocks Modelled by Yukawa Potentials

引用

Chinese Journal of Polymer Science 2021年第11期39卷 1502-1509页

作者： Xu Zhang Jialiang Chen Lin Xu Tianxi Liu Innovation center for Textile Science and Technology State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China national Garment and Accessories quality Supervision Testing center(Fujian) Fujian Provincial Key Laboratory of Textiles Inspection TechnologyFujian Fiber Inspection CenterFuzhou 350026China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

We employed the extended self-consistent field theory to investigate the supramolecular self-assembly behaviors of asymmetric diblock copolymer blends(AB/B’C)with hydrogen bonding interactions between shorter B and B’*** hydrogen bonding interactions are described by Yukawa potentials,where the hydrogen bonding donors and acceptors were modelled as two blocks smeared with opposite screened *** hierarchical microstructures with parallelly packed lamellae-in-lamellae(Lam)and 4.8.8 Archimedean tilting pattern(4.8.8)were observed at lower and higher hydrogen bonding density(θ),*** hierarchy of Lam and 4.8.8 were demonstrated by the one-and two-dimensional density profiles and the underlying order of the large-length-scale and small-length-scale microstructures were also *** was found that the 4.8.8 is favorable to the stronger hydrogen bonding density or ***θincreases,the microphase transition from Lam to 4.8.8 occurs atθ=0.34,which is mainly attributed to the optimization of the electrostatic energy and conformational entropy with sacrificing the interfacial *** work can provide a new strategy to understand the supramolecular self-assembly as well as the mechanism behind the formation of complex hierarchical microstructures.

关键词： Supramolecular self-assembly Hydrogen bond Block copolymer Self-consistent field theory Hierarchical microstructure

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

Bi_(2)S_(3)Nanorods Hosted on rGO Sheets from Pyrolysis of Molecular Precursors for Efficient Li-Ion Storage

引用

Energy & Environmental Materials 2021年第4期4卷 577-585页

作者： Zhongshuang Li Mengmeng He Bing Bo Huijuan Wei Yanyan Liu Hao Wen Yushan Liu Ke Zhang Panke Zhang Baojun Li Research center of Green Catalysis College of ChemistryZhengzhou UniversityZhengzhou 450001China School of Food Science and Technology Standardization and Quality Inspection CenterHenan University of TechnologyZhengzhou 450001China national Engineering Laboratory for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China

Bismuth-based compounds with high capacity and durability are still challenging in Li-ion batteries(LIBs).In this article,Bi_(2)S_(3)nanorods hosted on reduced graphene oxide nanosheets(Bi_(2)S_(3)/rGO,BSG)are successfully prepared using molecular precursor pyrolysis strategy.1D nanorod architecture possesses preeminent kinetic characteristics,shortening the ion diffusion path and increasing the contact area between electrode and *** large specific surface area and charge polarization of rGO at the interface promote charge *** capacity of material(BSG-400)reaches 558.4 m Ah g^(-1)at 0.2 A g^(-1)after 200 *** anode properties of the composite outperform those of pristine Bi_(2)S_(3).The introduction of graphene enables the interfacial interaction between rGO and Bi_(2)S_(3).The closely contact interface improves the conductivity and lithium storage performances of Bi_(2)S_(3).The regulatory effect of rGO on the electronic density of states and band gap of Bi_(2)S_(3)has been demonstrated by theoretical *** synthetic approach has the advantages of universality,simple operation procedure,and strong *** research provides some ideas for the preparation of other metal sulfides/rGO nanomaterials and their application in battery research.

关键词： Bi_(2)S_(3) Li-ion batteries molecular precursor nanorods pyrolysis reduced graphene oxide

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：