检索结果-南通市图书馆

Synthesis of new 1,2,4-oxadiazolidin-5-ylthiophenes and thienopyrimidine derivatives by aza-Wittig reaction using a thienyl carbodiimide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第4期23卷 411-414页

作者： Afaf m.Abdel Hameed Chemistry Department Faculty of ScienceMinia University

Azidation of aminothiophene derivative 1 afforded the corresponding azido derivative *** latter reacted with triphenylphosphine to afford iminophosphorane derivatives *** 3 with phenylisocyanate gave the highly reactive carbodiimide intermediate 4,which was reacted with different nitrones to afford new l,2,4-oxadiazolidin-5-ylidene-aminothiophenes 5a-c. Treatment of 4 with absolute EtOH at room temperature gave methyleneamino-5-（methylthio）thiophene 7,（methylthio）-3-（3- phenylureidothiophene）-2-carboxylate 8 or thienopyrimidine 9 and 10 at refluxing *** reaction of carbodiimide intermediate 4 with different secondary amines gave the new thienopyrimidines 11a-c.

关键词： Carbodiimide Cycloaddition 1 2 4-Oxadiazolidin-5-ylideneaminothiophene derivatives Thienopynmidine Aza-Wittig reaction

Necklaces of pT-symmetric dimers

在线全文

学校读者我要写书评

暂无评论

photonics Research 2018年第5期6卷 I0012-I0018页

作者： D.j.NODAL STEVENS BENjAmIN jARAmILLO AVILA B.m.RODRIGUEZ-LARA Tecnologico de monterrey Escuela de Ingenieria y CienciasAve.Eugenio Garza Sada 2501MonterreyN.L.64849Mexico CONACYT-Instituto Nacional de Astroffsica Optica y ElectronicaCalle Luis Enrique Erro No.1Sta.Ma.TonantzintlaPue.CP 72840Mexico Instituto Nacional de Astroffsica Optica y ElectronicaCalle Luis Enrique Erro No.1Sta.Ma.TonantzintlaPue.CP 72840Mexico

We study light propagation through cyclic arrays, composed by copies of a given pT-symmetric dimer, using a group theoretical approach and finite dement modeling. The theoretical mode-coupling analysis suggests the use of these devices as output port replicators where the dynamics is controlled by the impinging light field. This is confirmed in good agreement with finite element propagation in an experimentally feasible necklace of passive pT-symmetric dimers constructed from lossy and lossless waveguides.

关键词： Necklaces pT-symmetric dimers

pHairyRed： A Novel Binary Vector Containing the DsRed2 Reporter Gene for Visual Selection of Transgenic Hairy Roots

在线全文

学校读者我要写书评

暂无评论

molecular plant 2011年第3期4卷 537-545页

作者： meng-Han Lin peter m. Gresshoff Arief Indrasumunar Brett j. Ferguson Australian Research Council Centre of Excellence for Integrative Legume Research The University of Queensland St Lucia Brisbane QLD 4072 Australia

We developed a new plant transformation vector, pHairyRed, for enabling high throughput, non-destructive selection of Agrobacterium rhizogenes-mediated ＇hairy-root＇ transformation, pHairyRed allows easy in planta visualiza- tion of transgenic tissue with minimal disturbance to the plant. The DsRed2 reporter gene, encoding a red fluorescent protein, was cloned to yield pHairyRed （harbouring a multiple cloning site）, which was used with the highly efficient K599 A. rhizogenes strain to infect soybean （Glycine max L. merrill） plants. DsRed2 fluorescence was easily detected in planta for the duration of a 5-week study with negligible levels of background autofluorescence. This enabled visual selection of transformed roots and subsequent excission of non-transformed roots, pHairyRed-transformed roots nodu- lated normally when inoculated with Bradyrhizobiumj.p.nicum. Within the nodule, DsRed2 fluorescence was plant-spe- cific, being absent in the bacteroid-dominated nodule infected zone. To test the reliability of pHairyRed as a high-fidelity binary vector reporter system, the gene encoding the soybean Nod factor receptor, GmNFRloL, was cloned into the vector for use in a complementation study with a non-nodulating nfrloL mutant of soybean. Complementation was achieved and, without exception, DsRed2 fluorescence was detected in all hairy roots that successfully formed nodules （100%, n = 34）. We anticipate broad application of this reporter system for the further analysis of root-related events in soybean and related legumes.

关键词： Fluorescence imaging genetics molecular biology plant-microbe interactions soybean plant transformation.

Discovery of high-entropy ceramics via machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational materials 2020年第1期6卷 1323-1331页

作者： Kevin Kaufmann Daniel maryanovsky William m.mellor Chaoyi Zhu Alexander S.Rosengarten Tyler j.Harrington Corey Oses Cormac Toher Stefano Curtarolo Kenneth S.Vecchio Department of NanoEngineering UC San DiegoLa JollaCA 92093USA Department of Cognitive Science UC San DiegoLa JollaCA 92093USA materials Science and Engineering program UC San DiegoLa JollaCA 92093USA Department of mechanical Engineering and materials Science Duke UniversityDurhamNC 27708USA materials Science Electrical EngineeringPhysics and ChemistryDuke UniversityDurhamNC 27708USA

Although high-entropy materials are attracting considerable interest due to a combination of useful properties and promising applications,predicting their formation remains a hindrance for rational discovery of new *** approaches are based on physical intuition and/or expensive trial and error *** computational methods rely on the availability of sufficient experimental data and computational *** learning(mL)applied to materials science can accelerate development and reduce *** this study,we propose an mL method,leveraging thermodynamic and compositional attributes of a given material for predicting the synthesizability(i.e.,entropy-forming ability)of disordered metal carbides.

关键词： ceramics entropy attracting

Editorial: Global fish passage issues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2021年第2期6卷 111-112页

作者： Daniel p.Zielinski marc Gaden Andrew m.muir Great Lakes Fishery Commission 2200 Commonwealth Blvd.Ste.100Ann ArborMI48105USA

Dams,culverts,and other water diversion/control structures are the most widespread human alteration to riverine habitat *** many of these structures often serve critical services(i.e.,source of agricultural and municipal water,power generation,flood protection,and sensitive ecosystem protection),they cause changes to local ecology by impeding animal movement and altering the adjoining habitat and associated ecological processes(Nilsson et al.,2005;Liermann et al.,2007).The disruption of fish movement by barriers has contributed to the decline of both migratory and non-migratory fish populations around the world.

关键词： Fish passage Global Barriers Dams Fishway

Ultrathin monolithic 3D printed optical coherence tomography endoscopy for preclinical and clinical use

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 753-762页

作者： jiawen Li Simon Thiele Bryden C.Quirk Rodney W.Kirk johan W.Verjans Emma Akers Christina A.Bursill Stephen j.Nicholls Alois m.Herkommer Harald Giessen Robert A.mcLaughlin Australian Research Council Centre of Excellence for Nanoscale Biophotonics Adelaide Medical SchoolUniversity of AdelaideAdelaideSA 5005Australia Institute for photonics and Advanced Sensing The University of AdelaideAdelaideSA 5005Australia Institute of Applied Optics(ITO)and Research Center SCopE University of Stuttgart70569 StuttgartGermany South Australian Health and medical Research Institute(SAHmRI) AdelaideSA 5000Australia Royal Adelaide Hospital AdelaideSA 5000Australia monash Cardiovascular Research Centre Monash UniversityMelbourneVIC 3168Australia th physics Institute and Research Center SCopE University of Stuttgart70569 StuttgartGermany

preclinical and clinical diagnostics increasingly rely on techniques to visualize internal organs at high resolution via *** endoscopic probes are necessary for imaging small luminal or delicate organs without causing trauma to ***,current fabrication methods limit the imaging performance of highly miniaturized probes,restricting their widespread *** overcome this limitation,we developed a novel ultrathin probe fabrication technique that utilizes 3D microprinting to reliably create side-facing freeform micro-optics(m diameter)on single-mode *** this technique,we built a fully functional ultrathin aberration-corrected optical coherence tomography *** is the smallest freeform 3D imaging probe yet reported,with a diameter of 0.457 mm,including the catheter *** demonstrated image quality and mechanical flexibility by imaging atherosclerotic human and mouse *** ability to provide microstructural information with the smallest optical coherence tomography catheter opens a gateway for novel minimally invasive applications in disease.

关键词： smallest utilize overcome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

政治经济学与欲望

世界社会科学 1992年第2期 33-34页

作者： m.j.夏皮罗 ,李黎

强调表现(representation)或中介(媒介)的不可避免性,是后现代政治经济学的特征。诚如德里达指出的,“事物从来不是整个地在场的”。与现代主义政治经济学家围绕需要的满足建构了有组织的社会王国相对,后现代政治经济学家建构了作为符... 详细信息

强调表现(representation)或中介(媒介)的不可避免性,是后现代政治经济学的特征。诚如德里达指出的,“事物从来不是整个地在场的”。与现代主义政治经济学家围绕需要的满足建构了有组织的社会王国相对,后现代政治经济学家建构了作为符号系统的社会秩序。“需要”问题是后现代政治经济学家与现代主义政治经济学家的一个重要分水岭。当现代主义者强调事物的满足需要的属性和无联系的商品形式时,

关键词：欲望对象政治经济学家现代主义现代政治经济学弗洛伊德

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

在软件工时费用估算中基于案例的推理

计算机工程与应用 1991年第5期27卷 128-137页

作者： S.Vicinanza m.j.p.ietula 崔源清华大学

Estor,是一个根据以往的研究收集口头记录提出并精练而成的基于案例的类比推理模型。它结合了五个类比案例问题的求解过程:问题表述,类比案例检索,结果转换,属性映射,和非一一对应的调整。这五个类属过程由有关系家以其专门领域内的知... 详细信息

Estor,是一个根据以往的研究收集口头记录提出并精练而成的基于案例的类比推理模型。它结合了五个类比案例问题的求解过程:问题表述,类比案例检索,结果转换,属性映射,和非一一对应的调整。这五个类属过程由有关系家以其专门领域内的知识进行了补允。其结果表现为十五项软件费用估算任务,其中十项曾由有关系家解答,其余五项为新添入任务。为了进行比较,同时要求专家对该五项任务也做出估算。把Estor做出的估算与专家以及由Functiontpoint和COCOmO对这项计划做出的估算进行了比较,发现由专家(人)和Estor(模型)分别控制而做出的估算之间的差异是明显的。对十五项计划做出的估计(由专家和Estor模型)与实际费用值的相关系数分别为0.98和0.97。此外,这些系数与COCOmO以及Function points产生的值则相差更远。本文将着重讨论模型和有关专家之间的差异。

关键词：软件开发工时费用推理

硅粉纯化水中病毒核酸在pCR方法中作用研究

在线全文

学校读者我要写书评

暂无评论

卫生研究 1996年第3期25卷 143-147页

作者：刘晶星 j.m.Seigneurin 上海第二医科大学微生物教研室上海200025 法国格勒诺布尔(Grenoble)第一大学医学院分子病毒室

利用纯腐殖酸制剂,人工制备了污染有脊髓灰质炎病毒、甲型肝炎病毒、轮状病毒及3种病毒混合的水样品,研究了腐殖酸对反转录和 pCR(RT-pCR)的抑制作用及硅粉的去抑制作用。结果显示当水中腐殖酸浓度大干或等于1g/L 时,3种病毒的 RT-pCR ... 详细信息

利用纯腐殖酸制剂,人工制备了污染有脊髓灰质炎病毒、甲型肝炎病毒、轮状病毒及3种病毒混合的水样品,研究了腐殖酸对反转录和 pCR(RT-pCR)的抑制作用及硅粉的去抑制作用。结果显示当水中腐殖酸浓度大干或等于1g/L 时,3种病毒的 RT-pCR 均被抑制,当浓度在10～100mg/L 之间,常规方法提取病毒 RNA、RT-pCR 阴性,而经硅粉纯化处理过的病毒 RNA、RT-pCR 阳性,硅粉能有效去除腐殖酸对 pCR 的抑制;当浓度等于或小于10mg/L RT-pCR 不受影响。结果还同时表明,用6-核苷酸代替病毒特异性引物成功地对混合病毒样品进行了反转录。

关键词：病毒核酸硅粉聚合酶链反应