bluuebunny/crossref_metadata_2025_split huggingface dataset:
Branched Silicon Nanotubes and Metal Nanowires via AAO‐Template‐Assistant Approach
Authors: Chen Bensong , Xu Qiaoling , Zhao Xianglong , Zhu Xiaoguang , Kong Mingguang , Meng Guowen 
Published: September 2010

AbstractBranched and multi‐generation branched architectures of silicon nanotubes (SiNTs) and metal nanowires (NWs), built via filling the branched and multi‐generation‐branched nanochannels of anodic aluminum oxide (AAO) templates by pyrolysis of silane and electrodeposition of metals, are reported. The AAO templates with branched and multi‐generation‐branched nanochannels are created by sequentially reducing the applied anodizing voltage multiple times during the anodization of aluminum. The desired total generation number of branching can be controlled by the times of voltage reduction during the anodization; while each generation of branching is controlled in terms of branching number, diameter and length. The approach allows precise control over the complexity of the SiNTs and metal NWs with several levels of junctions and branching that have potentials in nanoelectronics, nanomagnetism and nanosystems.
Polyoxometalates: Powerful Catalysts for Atom‐Efficient Cyclopropanations
Authors: Boldini Irene , Guillemot Geoffroy , Caselli Alessandro , Proust Anna , Gallo Emma 
Published: September 2010

AbstractThe polyoxometalate‐based catalytic cyclopropanation of olefins by ethyl diazoacetate (EDA) is reported. The outstanding catalyst productivity (TONs up to 100,000) and the use of equimolar EDA/olefin ratio confer to the methodology a high sustainability. Preliminary mechanistic investigations are also discussed.
Copper(II) Triflate‐Catalyzed Three‐Component Coupling of Aldehydes, Alkynes and Carbamates
Authors: Dou Xiao‐Yong , Shuai Qi , He Liang‐Nian , Li Chao‐Jun 
Published: September 2010

AbstractA simple and efficient synthesis of propargylcarbamates was developed through a copper(II) triflate‐catalyzed coupling of aldehydes, alkynes and carbamates. No co‐catalyst or ligand is required.
Mizoroki–Heck Reactions with 4‐Phenoldiazonium Salts
Authors: Schmidt Bernd , Hölter Frank , Berger René , Jessel Sönke 
Published: September 2010

AbstractSignificantly better yields were achieved in Mizoroki–Heck reactions using 4‐phenoldiazonium salts instead of their O‐alkylated analogues under otherwise identical conditions. We found that a one‐flask deacetylation–diazotation–precipitation sequence starting from paracetamol or acetanilides derived thereof provides a convenient access to the required diazonium tetrafluoroborates. The utility of these arylating agents in palladium‐catalyzed CC bond forming reactions was demonstrated for a one‐flask‐synthesis of the heterocyclic core of the drug aripiprazole. Notably, the diazonium salt formation from an acetanilide could be combined with two Pd‐catalyzed steps in a one‐flask sequence, without any exchange of solvents or isolation of intermediates.
Estimates of interethnic admixture in the Brazilian population using a panel of 24 X‐linked insertion/deletion markers
Authors: Resque Rafael Lima , Freitas Natalle Do Socorro Da Costa , Rodrigues Elzemar Martins Ribeiro , Guerreiro João Farias , Santos Ney Pereira Carneiro Dos , Ribeiro Dos Santos Ândrea , Zago Marco Antonio , Santos Sidney 
Published: September 2010

AbstractObjectives. In this study, we aimed to identify ancestry informative haplotypes and make interethnic admixture estimates using X‐chromosome markers.Methods. A significant sample (461 individuals) of European, African, and Native American populations was analyzed, and four linkage groups were identified. The data obtained were used to describe the ancestral contribution of populations from four different geographical regions of Brazil (745 individuals).Results. The global interethnic admixture estimates of the four mixed populations under investigation were calculated applying all the 24 insertion/deletion (INDEL) markers. In the North region, a larger Native Americans ancestry was observed (42%). The Northeast and Southeast regions had smaller Native American contribution (27% in both of them). In the South region, there was a large European contribution (46%).Conclusions. The estimates obtained are compatible with expectations for a colonization model with biased admixture between European men (one X chromosome) and Native American and African women (two X chromosomes), so the 24 X‐INDEL panel described here can be a useful to make admixture interethnic estimates in Brazilian populations. Am. J. Hum. Biol., 2010. © 2010 Wiley‐Liss, Inc.
Spatial relation between microbleeds and amyloid deposits in amyloid angiopathy
Authors: Dierksen Gregory A. , Skehan Maureen E. , Khan Muhammad A. , Jeng Jed , Nandigam R.N. Kaveer , Becker John A. , Kumar Ashok , Neal Krista L. , Betensky Rebecca A. , Frosch Matthew P. , Rosand Jonathan , Johnson Keith A. , Viswanathan Anand , Salat David H. , Greenberg Steven M. 
Published: September 2010

AbstractAdvanced cerebrovascular β‐amyloid deposition (cerebral amyloid angiopathy, CAA) is associated with cerebral microbleeds, but the precise relationship between CAA burden and microbleeds is undefined. We used T2*‐weighted magnetic resonance imaging (MRI) and noninvasive amyloid imaging with Pittsburgh Compound B (PiB) to analyze the spatial relationship between CAA and microbleeds. On coregistered positron emission tomography (PET) and MRI images, PiB retention was increased at microbleed sites compared to simulated control lesions (p = 0.002) and declined with increasing distance from the microbleed (p < 0.0001). These findings indicate that microbleeds occur preferentially in local regions of concentrated amyloid and support therapeutic strategies aimed at reducing vascular amyloid deposition. Ann Neurol 2010
Isopropyl myristate modified silicone as a potential new encapsulating material for implantable devices
Authors: Wasikiewicz Jaroslaw M. , Paul Deepen , Roohpour Nima , Vaghela Jaina , Grahn Michael F. , Vadgama Pankaj 
Published: September 2010

AbstractA new modified silicone was obtained by the physical entrapment of a hydrophobic lipid, isopropyl myristate (IPM), to improve the encapsulation properties and corrosion resistance of medical electronic implants. Differences between the water transport for films in contact with water vapor versus those in contact with liquid water were identified; they showed increased permeability to water vapor, which was possibly the result of differences in the water organization at the hydrophobic film interface. Improvements, including enhanced scratch resistance and adhesion, in the mechanical properties of the modified material was also achieved. The incorporation of IPM further resulted in a significant improvement in the cell biocompatibility compared with the unmodified polymer; this suggested that the IPM combination could be a viable basis for implant device packaging. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Relationship between electrical and mechanical loss tangents of hollow glass powder reinforced epoxy composites: A pilot study
Authors: Ku H. , Maxwell A. , Wong P. , Huang J. , Fung H. 
Published: September 2010

AbstractThe mechanical and thermal properties of hollow glass powder reinforced epoxy resin composites have previously been measured and evaluated in earlier studies (Ku et al., J Compos Mater, submitted). These basic, but critical data sets have yielded interest in relevant industries in Australia. This study therefore focused on measuring and evaluating the dielectric properties of these composites with a view to benefit these relevant industries. The relationship between the dielectric and thermal properties was also studied and correlated. The original contributions of this article states that samples postcured in an oven were found to have lower electrical as well as mechanical loss tangent values than their counterparts cured in ambient conditions alone. The storage modulus of all samples conventionally postcured was also higher than their counterparts. The conventionally postcured samples were also found to have lower glass transition temperature than their rivals and softer material. For all percentages by weight of glass powder, the glass transition temperature for the oven cured samples was higher and it can be argued that the composite was stiffer; the opposite was true for the ambient cured sample. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Characterizing gum natural rubber samples through advanced techniques
Authors: Leblanc Jean L. , Pilard Jean‐François , Pianhanuruk Ekkawit , Campistron Irene , Buzaré Jean‐Yves 
Published: September 2010

AbstractOwing to its origin, Natural Rubber exhibits more variation than synthetic polymers. If, over the years, NR specifications have evolved from mere visual inspections towards the more complex Technically Specified Rubber (TSR) schema, industrial practice shows that, even for typical TSR grades, significant variations still exist within each shipment, especially in regard to processability. It follows that mastication is quite systematically needed in industrial operations, without or with processing aids or so‐called peptizers. Typical NR compounding operations consume therefore time and mixer capacity, a situation, which obviously calls both better characterization methods of (gum) natural rubber and eventually improved grades. There are nowadays promising new techniques to analyze and characterize polymer materials, some of which are a priori attractive for a better specification of NR grades. One such technique is the so‐called Fourier Transform rheometry, a dynamic testing method to investigate both the linear and the non‐linear viscoelastic domains of polymer materials. Other are spectroscopic methods like solid Nuclear Magnetic Resonance (NMR), either liquid or solid, whose results might be complemented by Size Exclusion Chromatography with special detection techniques, e.g. SEC‐MALS, and Differential Scanning Calorimetry (DSC). The purpose of the work reported here was to investigate a series of gum NR grades using such techniques, with the objectives not only to demonstrate their interest but also to cross‐validate their results. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Flower‐Like Hierarchically Nanostructured Hydroxyapatite Hollow Spheres: Facile Preparation and Application in Anticancer Drug Cellular Delivery
Authors: Wang Ke‐Wei , Zhu Ying‐Jie , Chen Xiao‐Yan , Zhai Wan‐Yin , Wang Qi , Chen Feng , Chang Jiang , Duan You‐Rong 
Published: September 2010

AbstractFlower‐like nanostructured hydroxyapatite hollow spheres (NHHS) assembled with nanosheets with a hierarchical morphology are fabricated by a rapid microwave‐assisted hydrothermal route. The presence and concentration of block copolymer poly(lactide)‐block‐poly(ethylene glycol) (PLA–PEG) are important parameters for the formation of the hollow structure. The possible formation mechanism of NHHS is proposed. The NHHS are explored as anticancer drug carriers for cellular delivery of mitoxantrone (MIT). The MIT‐loaded NHHS exhibit sustained‐drug‐release behavior in vitro and the intracellular drug‐distribution tests indicate that the MIT loaded in NHHS carriers can enter the cells efficiently. The experiments also show that the NHHS have a good biocompatibility, and therefore, they are promising anticancer drug carriers in cancer chemotherapy.
Interventional cardiology live case presentations: Regulatory considerations
Authors: Farb Andrew , Brown Sheila A. , Wolf Deborah A. , Zuckerman Bram 
Published: September 2010

AbstractLive case presentations are increasingly common at interventional cardiology conferences. Taking advantage of significant advances in communication technology, broadcasts of procedures can be viewed as an extension of traditional medical education targeted to large groups of practitioners. However, there are important ethical, commercial, and patient safety issues associated with live cases that deserve attention. Use of investigational devices in live case demonstrations is subject to review and approval by FDA's Center for Devices and Radiological Health (CDRH), and the outcomes of patients participating in live cases are considered in the overall clinical study results. This article discusses CDRH's regulatory view of live case presentations with a focus on patient safety, clinical trial integrity, and concerns regarding improper medical device promotion. © 2010 Wiley‐Liss, Inc.
Ascorbic Acid Induced Enhancement of Room Temperature Phosphorescence of Sodium Tripolyphosphate‐Capped Mn‐Doped ZnS Quantum Dots: Mechanism and Bioprobe Applications
Authors: Wang He‐Fang , Li Yan , Wu Ye‐Yu , He Yu , Yan Xiu‐Ping 
Published: September 2010

AbstractAlthough quantum dot (QD)‐based room temperature phosphorescence (RTP) probes are promising for practical applications in complex matrixes such as environmental, food and biological samples, current QD‐based‐RTP probes are not only quite limited but also exclusively based on the RTP quenching mechanism. Here we report an ascorbic acid (AA) induced phosphorescence enhancement of sodium tripolyphosphate‐capped Mn‐doped ZnS QDs, and its application for turn‐on RTP detection. The chelating ability allows AA to extract the Mn and Zn from the surface of the QDs and to generate more holes which are subsequently trapped by Mn2+, while the reducing property permits AA to reduce Mn3+ to Mn2+ in the excited state, thereby enhancing the excitation and orange emission of the QDs. The enhanced RTP intensity of the QDs increases linearly with the concentration of AA in the range of 0.05–0.8 μM. Thus, a QD‐based RTP probe for AA is developed. The proposed QD‐based turn‐on RTP probe avoids tedious sample pretreatment, and offers good sensitivity and selectivity for AA in the presence of the main relevant metal ions and other molecules in biological fluids. The limit of detection (3s) of the developed method is 9 nM AA, and the relative standard deviation is 4.8 % for 11 replicate detections of 0.1 μM AA. The developed method is successfully applied to the analysis of real samples of human urine and plasma for AA with quantitative recoveries from 96 to 105 %.
ChemInform Abstract: Hydrothermal Synthesis, Characterization and Composition‐Dependent Magnetic Properties of LaFe1‐xCrxO3 System (0 ≤ x ≤ 1).
Authors: Hu Weiwei , Chen Yan , Yuan Hongming , Zhang Ganghua , Li Guanghua , Pang Guangsheng , Feng Shouhua 
Published: September 2010

AbstractThe title compounds are hydrothermally synthesized from aqueous solutions of La(NO3)3, CrCl3, Fe(NO3)3, and KOH with various initial Fe/Cr ratios and KOH contents (autoclave, 513 K, 5 d) and characterized by powder XRD, SEM, and magnetization measurements.
ChemInform Abstract: Synthesis of Boron Suboxide (B6O) with Ball Milled Boron Oxide (B2O3) under Lower Pressure and Temperature.
Authors: Jiao Xiaopeng , Jin Hua , Liu Fuyang , Ding Zhanhui , Yang Bin , Lu Fengguo , Zhao Xudong , Liu Xiaoyang 
Published: September 2010

AbstractWell‐crystallized icosahedral B6O grains with diameters ranging from 100 nm to 1.3 μm are prepared from mixtures of boron and ball milled B2O3 powders (h‐BN capsule, 2 GPa, 1400 °C, 6 h).
ChemInform Abstract: A Series of BaAl2‐xSixH2‐x (0.4 < x < 1.6) Hydrides with Compositions and Structures in Between BaSi2 and BaAl2H2.
Authors: Moser D. , Haeussermann U. , Utsumi T. , Bjoerling T. , Noreus D. 
Published: September 2010

AbstractThe title hydrides are prepared by direct reaction of BaAl2‐xSix (obtained by melting stoichiometric mixtures of the elements) with hydrogen (autoclave, 70 bar H2, 300—700 °C, 3—48 h).
ChemInform Abstract: Exploring Order—Disorder Structural Transitions in the Li—Nb—N—O System: The New Antifluorite Oxynitride Li11NbN4O2.
Authors: Cabana J. , Casas‐Cabanas M. , Santner H. J. , Fuertes A. , Palacin M. R. 
Published: September 2010

AbstractLi16Nb2N8O is prepared from a mixture of Li3N, NbN, and Li2O in a molar ratio of 3:1:.0.18 (850 °C, 4 h).
ChemInform Abstract: KBiMS4 (M: Si, Ge): Synthesis, Structure, and Electronic Structure.
Authors: Mei Dajiang , Lin Zheshuai , Bai Lei , Yao Jiyong , Fu Peizhen , Wu Yicheng 
Published: September 2010

AbstractThe title compounds are prepared from mixtures of the elements using K2S3 as a reactive flux (873 K, 72 h) and characterized by single crystal XRD, UV/VIS diffuse reflectance spectroscopy, and plane‐wave pseudopotential band structure calculations.
ChemInform Abstract: Reductive Ring‐Opening of Phthalan and Isochroman: Application to the Stereoselective Synthesis of Tetrahydroisoquinolines and Tetrahydrobenzazepines.
Authors: Garcia Daniel , Foubelo Francisco , Yus Miguel 
Published: September 2010

AbstractDifferently substituted tetrahydroisoquinolines and ‐benzazepines are prepared with high stereoselectivity starting from phthalan and isochroman, resp., and a chiral N‐tert‐butylsulfinyl aldimine.
ChemInform Abstract: Readily Available Chiral Phosphine—Aminophosphine Ligands Derived from 1‐Phenylethylamine for Rh‐Catalyzed Enantioselective Hydrogenations.
Authors: Zhou Xiao‐Mao , Huang Jia‐Di , Luo Li‐Bin , Zhang Cheng‐Lu , Zheng Zhuo , Hu Xiang‐Ping 
Published: September 2010

AbstractAmong the novel phosphineaminophosphine derivatives prepared, effective ligands are identified for the Rh‐catalyzed asymmetric hydrogenation of enamides (II), Z‐β‐dehydroamino acid esters (VI), and itaconate (IX).
ChemInform Abstract: Structurally Constrained C1‐1,1′‐Bisisoquinoline‐Based Chiral Ligands: Geometrical Implications on Enantioinduction in the Addition of Diethylzinc to Aldehydes.
Authors: Qi Gao , Judeh Zaher M. A. 
Published: September 2010

AbstractAmong a variety of novel C1‐symmetric bisisoquinoline ligands (I), only the N‐unsubstituted ligand (Ia) possesses a conformation necessary to achieve good enantioselectivity in the diethylzinc addition towards aromatic aldehydes.
ChemInform Abstract: Iridium/Chiral Diene‐Catalyzed Asymmetric 1,6‐Addition of Arylboroxines to α,β,γ,δ‐Unsaturated Carbonyl Compounds.
Authors: Nishimura Takahiro , Yasuhara Yuichi , Sawano Takahiro , Hayashi Tamio 
Published: September 2010

AbstractThe title reaction of dienones, dienamides, or a dienoate affords δ‐arylated carbonyl compounds with high enantioselectivities by use of the C2‐symmetric tetrafluorobenzobarrelene‐derived iridium complex IRB as catalyst.
ChemInform Abstract: Chelation‐Assisted Palladium‐Catalyzed Acyloxylation of Benzyl sp3 C—H Bonds Using PhI(OAc)2 as Oxidant.
Authors: Zhang Shouhui , Luo Fang , Wang Wenhui , Jia Xiaofei , Hu Maolin , Cheng Jiang 
Published: September 2010

AbstractSubstrates (I) and (VI) react with chelation assistance of the quinoline N‐atom at the 8‐alkyl side chain to give monoacetoxylation products.
ChemInform Abstract: Enantioselective α‐Fluorination and Chlorination of β‐Ketoesters by Cobalt Catalyst.
Authors: Kawatsura Motoi , Hayashi Shunsuke , Komatsu Yuji , Hayase Shuichi , Itoh Toshiyuki 
Published: September 2010

AbstractThe Co‐catalyzed enantioselective α‐fluorination and α‐chlorination of β‐ketoesters (I) and (III) is described.
ChemInform Abstract: An Efficient N‐Arylation of Heterocycles with Aryl‐, Heteroaryl‐, and Vinylboronic Acids Catalyzed by Copper Fluorapatite.
Authors: Kantam Mannepalli Lakshmi , Venkanna Gopaladasu Tirupati , Kumar Kota Balaji Shiva , Subrahmanyam Vura Bala 
Published: September 2010

AbstractA new and efficient method for the arylation of heterocycles is presented using copper fluorapatite as catalyst.
ChemInform Abstract: Silver‐Catalyzed Benzylation and Allylation of Tertiary Alkyl Bromides with Organozinc Reagents.
Authors: Mitamura Yukihiro , Asada Yoshihiro , Murakami Kei , Someya Hidenori , Yorimitsu Hideki , Oshima Koichiro 
Published: September 2010

AbstractSilver salts catalyze the benzylation and allylation of tertiary alkyl bromides with organozinc reagents.
ChemInform Abstract: Iron/Copper Promoted Oxidative Homo‐Coupling Reaction of Terminal Alkynes Using Air as the Oxidant.
Authors: Meng Xu , Li Chuanbin , Han Baochun , Wang Tiansheng , Chen Baohua 
Published: September 2010

AbstractIn the presence of air, the combination of Fe(acac)3 and a trace of Cu(acac)2 promotes the homocoupling of terminal alkynes to give the symmetrical or asymmetrical diynes (II) or (IV).
ChemInform Abstract: An Organocatalytic Asymmetric Nazarov Cyclization.
Authors: Basak Ashok K. , Shimada Naoyuki , Bow William F. , Vicic David A. , Tius Marcus A. 
Published: September 2010

AbstractThe reaction of α‐ketoenones is catalyzed by the thiourea organocatalyst to afford the target cyclopentene derivatives with good yields and enantioselectivities.
ChemInform Abstract: Propargylic Activation Across a Heterobimetallic Ir—Sn Catalyst: Nucleophilic Substitution and Indene Formation with Propargylic Alcohols.
Authors: Chatterjee Paresh Nath , Roy Sujit 
Published: September 2010

AbstractThe propargylic alcohols smoothly and regioselectively react with various nucleophiles to afford diverse synthetically important propargylic compounds.
ChemInform Abstract: Chromium‐Catalyzed Homoaldol Equivalent Reaction Employing a Nucleophilic Propenyl Acetate.
Authors: Kang Jun Yong , Connell Brian T. 
Published: September 2010

AbstractAcetate (II) is employed as a masked homoenolate nucleophile in addition reactions to aromatic, aliphatic and α,β‐unsaturated aldehydes under mild Cr/Mn redox conditions.
ChemInform Abstract: Enantioselective Synthesis of syn/anti‐1,3‐Amino Alcohols via Proline‐Catalyzed Sequential α‐Aminoxylation/α‐Amination and Horner—Wadsworth—Emmons Olefination of Aldehydes.
Authors: Jha Vishwajeet , Kondekar Nagendra B. , Kumar Pradeep 
Published: September 2010

AbstractThe target compounds are prepared with anti‐ or syn‐selectivity using D‐ or L‐proline as a catalyst, respectively.
ChemInform Abstract: Sterically Congested Molecules. Part 21. Easier Preparation of 2,6‐Di‐tert‐butylphenyl Derivatives.
Authors: Knorr Rudolf , Rossmann Eva Christine , Knittl Monika 
Published: September 2010

AbstractNaH‐mediated reaction of 2,6‐di‐tert‐butylphenol with dimethyl sulfate produces the anisole derivative with complete suppression of the competing 4‐methylation.
ChemInform Abstract: Iron(III) Tosylate Catalyzed Deprotection of Aromatic Acetals in Water.
Authors: Olson Margaret E. , Carolan James P. , Chiodo Michael V. , Lazzara Phillip R. , Mohan Ram S. 
Published: September 2010

AbstractA broad spectrum of aromatic as well as conjugated acetals and ketal (XIII) can be used as substrates for a successful deprotection procedure.
ChemInform Abstract: Organocatalytic Asymmetric syn‐Selective Direct Aldol Reaction in Ionic Liquid.
Authors: Yong Fui‐Fong , Poh Chai‐Yun , Chua Guan‐Leong , Teo Yong‐Chua 
Published: September 2010

AbstractA siloxy serine organocatalyst mediates the direct aldol reaction of Tbs‐protected hydroxyacetone (II) with a variety of arylaldehydes (I) to afford β‐hydroxycarbonyl scaffolds in good yields and enantioselectivities up to 94%.
ChemInform Abstract: Solvent‐Free Horner—Wadsworth—Emmons Reaction Using DBU.
Authors: Ando Kaori , Yamada Kyohei 
Published: September 2010

AbstractThe reaction of phosphonates with aldehydes provides α,β‐unsaturated esters and ketones with excellent (E)‐selectivity (<95:5) in the case of (III) and (X).
ChemInform Abstract: A Novel and Efficient Cross‐Coupling of Tris(fluorinated phenyl)boroxins with Disulfides Catalyzed by CuI/1,10‐Phenanthroline.
Authors: Yu Chuanming , Jin Beibei , Liu Zhenyu , Zhong Weihui 
Published: September 2010

AbstractBoroxin (I) or its tris(3‐fluorophenyl) analogue give by coupling with aromatic or aliphatic disulfides the corresponding sulfides.
ChemInform Abstract: Palladium‐Catalyzed Decarboxylative 1,2‐Addition of Carboxylic Acids to Aldehydes or Imines.
Authors: Luo Yong , Wu Jie 
Published: September 2010

AbstractThe reaction presented is limited to electron‐rich aryl carboxylic acids (I) and electron‐poor aldehydes (IV) or imines (II).