bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of coprecipitated barium ferrite on the cure characteristics and dynamic properties of natural rubber–ferrite composites around percolation
Authors: Makled Mahmoud Hosseny Moussa , Washiya Hirohiko , Tsuda Hiroshi , Matsui Toshiyuki 
Published: May 2009

AbstractThe influence of coprecipitated hexagonal barium ferrite BaFe12O19 phase on the cure characteristics and dynamic properties of natural rubber–ferrite composites has been studied as a function of ferrite loading up to 220 phr (part per hundred part of rubber). Unusual characteristics of coprecipitated ferrite particles were discovered by scanning electron microscope. The results show that scorch time t10 and cure time t90 decrease dramatically with increasing ferrite content up to critical ferrite loading. After 160 phr, t90 increases sharply with increasing ferrite content, in contrast to saturation of t10. Minimum torque recorded normal behavior at low ferrite loading, whereas it decreases with increasing ferrite content at high ferrite loading because of dilution effects. The storage modulus E′ and loss modulus E″ decrease with increasing temperature. The loss tangents (tanδ) of the composites are greater than those of the pure rubber. Linear viscoelastic behavior was observed as a result of the homogeneity and compatibility of the composites. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Study of PET/PP/TiO2 microfibrillar‐structured composites, Part 2: Morphology and mechanical properties
Authors: Li Wenjing , Schlarb Alois K. , Evstatiev Michael 
Published: May 2009

AbstractUncompatibilized and compatibilized (polypropylene grafted maleic anhydride as compatibilizer) polyethylene terephthalate (PET)/polypropylene (PP)/TiO2 microfibrillar composites (MFC) were prepared by injection molding of the pelletized PET/PP/TiO2 drawn strands. The morphology of PET fibrils and the distribution of TiO2 particles in the composites were examined. After injection molding the preferential location of TiO2 particles is still preserved. Because of the reinforcement effect of PET fibrils, the tensile properties and impact strength of the PET/PP MFC are improved compared with the pure PP. Incorporation of TiO2 particles results in decrease of both tensile strength and impact strength of the composites. However, the compatibilized PET/PP/TiO2 MFC demonstrate better mechanical properties compared with the uncompatibilized ones. DMA analysis shows that the glass transition temperature (Tg) of PET in the uncompatibilized PET/PP/TiO2 MFC and the Tg of PP in the compatibilized PET/PP/TiO2 MFC are elevated by about 2°C. The elevation of Tg is attributed to the preferential location of TiO2 particles in the composites. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Chemical sensing materials. I. Electrically conductive SEBS copolymer systems
Authors: Pavlovsky S. , Siegmann A. 
Published: May 2009

AbstractChemical sensing materials based on conductive carbon black (CB) filled [styrene‐ethylene butylene‐styrene] triblock‐copolymers (SEBS) were investigated. Several types of SEBS copolymers were studied, differing in composition and melt viscosity. The sensing is based on electrical conductivity changes upon solvent sorption/desorption. Compression molding SEBS composites containing various amounts of CB were prepared. Their electrical conductivity was measured and samples containing CB, preferentially located in the continuous ethylene/butylene (EB) phase, at a level near the corresponding percolation threshold were used for the sensing experiments. The conductivity was measured during several exposure/drying cycles. Structure characterization included scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and calorimetry (DSC). The SEBS composites exhibit large reversible changes in conductivity upon exposure to a limited number of solvents, e.g., acetone, n‐heptane, and air drying cycles. This behavior was related to the sorption kinetics, affected by the solvent characteristics (solubility parameter, polarity, molecular volume and vapor pressure). The samples' resistance tended to return to their initial value upon short drying of acetone, and longer drying of other studied solvents. The nature of the SEBS, the CB content, and mixing temperature are all significant parameters, determining the sample's structure and the resultant sensing property. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Model selection for generalized linear models with factor‐augmented predictors
Authors: Ando Tomohiro , Tsay Ruey S. 
Published: May 2009

AbstractThis paper considers generalized linear models in a data‐rich environment in which a large number of potentially useful explanatory variables are available. In particular, it deals with the case that the sample size and the number of explanatory variables are of similar sizes. We adopt the idea that the relevant information of explanatory variables concerning the dependent variable can be represented by a small number of common factors and investigate the issue of selecting the number of common factors while taking into account the effect of estimated regressors. We develop an information criterion under model mis‐specification for both the distributional and structural assumptions and show that the proposed criterion is a natural extension of the Akaike information criterion (AIC). Simulations and empirical data analysis demonstrate that the proposed new criterion outperforms the AIC and Bayesian information criterion. Copyright © 2009 John Wiley & Sons, Ltd.
Time‐resolved spectral measurements of delayed luminescence from a single soybean seed: effects of thermal damage and correlation with germination performance
Authors: Lanzanò Luca , Sui Li , Costanzo Evelina , Gulino Marisa , Scordino Agata , Tudisco Salvatore , Musumeci Francesco 
Published: May 2009

AbstractDelayed luminescence from a single dry soybean seed was investigated in both spectral and time domains, under different excitation wavelengths. Emission spectra were collected, under 337 nm laser excitation, from native and artificially deteriorated seeds and the time‐dependence of different spectral components was analyzed in detail. The single seed viability was evaluated through observation of germination properties after imbibition and compared with different parameters related to the luminescence kinetics. The significant correlation found between single seed delayed luminescence parameters and germination capability strongly validates the connection of this phenomenon with the functional state of the system and suggests the development of a non‐invasive technique for seed quality determination. Copyright © 2009 John Wiley & Sons, Ltd.
The fluorescence enhancement of quercetin–nucleic acid system and the analytical application
Authors: Liu Yuan , Wu Xia , Zhou Haiping , Liu Xiaoyu , Zhang Fengju , Yang Jinghe 
Published: May 2009

AbstractNucleic acid can greatly enhance the fluorescence intensity of quercetin in HMTA‐HCl (pH 5.5) buffer. The enhanced intensity is in proportion to the concentration of nucleic acids in the range 5.0 × 10−9 to 1.0 × 10−6 g/mL for fsDNA, 5.0 × 10−9 to 7.0 × 10−7 g/mL for ctDNA and 5.0 × 10−9 to 1.0 × 10−6 g/mL for yRNA, and their detection limits (S/N = 3) are 3.5 × 10−9, 7.8 × 10−10 and 2.6 × 10−9 g/mL, respectively. In comparison with most reported fluorescent probes for the determination of nucleic acids, the proposed probe has higher sensitivity and lower toxicity. The interaction investigation indicates that quercetin binds with double‐strand DNA in groove binding mode, resulting in fluorescence enhancement of this system. Copyright © 2009 John Wiley & Sons, Ltd.
Interaction between felodipine and bovine serum albumin: fluorescence quenching study
Authors: Mote U. S. , Bhattar S. L. , Patil S. R. , Kolekar G. B. 
Published: May 2009

AbstractThe fluorescence quenching spectrum of bovine serum albumin (BSA) was investigated in the presence of felodipine (FLD) by spectroscopic methods including fluorescence spectroscopy and UV–Vis absorption spectroscopy. Stern–Volmer quenching was successfully applied and the corresponding thermodynamic parameters, namely enthalpy change (ΔH), free energy change (ΔG) and entropy change (ΔS) at different temperatures (304, 314 and 324 K) were calculated according to the Van't Hoff relation. This revealed that the hydrophobic interaction plays a major role in stabilizing the complex. The fluorescence spectrum of BSA was studied in presence of various concentrations of SDS surfactant. The distance (r) between donor (BSA) and acceptor (FLD) was obtained according to fluorescence resonance energy transfer (FRET). The synchronous fluorescence spectroscopy was used to investigate the effect of FLD on BSA molecule. The result shows that the conformation of BSA was changed in the presence of felodipine. Copyright © 2009 John Wiley & Sons, Ltd.
Conformation dependence of the CαDα stretch mode in peptides. II. Explicitly hydrated alanine peptide structures
Authors: Mirkin Noemi G. , Krimm Samuel 
Published: May 2009

AbstractOur previous studies of the potential utility of the CαDα stretch frequency, ν(CD), as a tool for determining conformation in peptide systems (Mirkin and Krimm, J Phys Chem A 2004, 108, 10923–10924; 2007, 111, 5300–5303) dealt with the spectroscopic characteristics of isolated alanine peptides with αR, β, and polyproline II structures. We have now extended these ab initio calculations to include various explicit‐water environments interacting with such conformers. We find that the structure‐discriminating feature of this technique is in fact enhanced as a result of the conformation‐specific interactions of the bonding waters, in part due to our finding (Mirkin and Krimm, J Phys Chem B 2008, 112, 15268) that CαDα…O(water) hydrogen bonds can be present in addition to those expected between water and the CO and NH of the peptide groups. In fact, ν(CD) is hardly affected by the latter bonding but can be shifted by up to 70 cm−1 by the former hydrogen bonds. We also discuss the factors that will have to be considered in developing the molecular dynamics (MD) treatment needed to satisfactorily take account of the influence of outer water layers on the structure of the first‐layer water molecules that hydrogen bond to the peptide backbone. © 2009 Wiley Periodicals, Inc. Biopolymers 91: 791–800, 2009.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Adolescent well‐being and supporting contexts: A comparison of adolescents in Ireland and Florida
Authors: McGrath Brian , Brennan M. A. , Dolan Pat , Barnett Rosemary 
Published: May 2009

AbstractThe purpose of this research was to examine the extent to which social support and wider community perceptions/engagements among adolescents are connected with well‐being. We compared adolescents in two different societal contexts, Florida in the United States and County Offaly, in Ireland, and posed the questions: What are the key predictors of subjective well‐being from the various sources of support, and to what extent does the impact of social support on well‐being vary across these two societies? Questionnaires were completed and returned for 607 respondents (322 in the Irish study and 285 in the Florida study). A variety of scales were adopted and designed to operationalize our key concepts of: Adolescent well‐being, social support, school satisfaction, neighbourhood quality of life and community/voluntary participation. Our results indicate that informal social support and school satisfaction were the strongest predictors of youth well‐being in both locations, despite some differences in terms of individual influencing variables. From informal sources, emotional support from friends and advice/concrete/esteem support from parents emerged as important predictive dimensions. Liking school, perceptions of doing well in school were the main predictors of school satisfaction in Ireland while, in Florida, student camaraderie and the experience of bullying emerged as significant. Copyright © 2009 John Wiley & Sons, Ltd.
First report on the use of a novel self‐expandable stent for treatment of ST elevation myocardial infarction
Authors: IJsselmuiden Alexander , Verheye Stefan 
Published: May 2009

AbstractA 69‐year‐old female underwent primary percutaneous coronary intervention with a Stentys™ self‐expandable stent. Potential benefits of this stent are less intimal proliferation, reduced need for predilatation, reduced risk of malapposition and distal embolization. After written informed consent, the occluded proximal left anterior descending artery was successfully treated with thrombosuction, followed by implantation of the self‐expandable stent. Intravascular ultrasound examination postprocedure and at 5 days showed good stent apposition and it appeared that the vessel diameter had increased probably due to self‐expanding properties of the stent and relief of coronary spasm. The patient was discharged event‐free. A larger patient cohort is needed to investigate safety and feasibility of this novel stent. © 2009 Wiley‐Liss, Inc.
Thrombus extrusion through filter wire basket
Authors: Cooper Robert M. , Morris John L. 
Published: May 2009

AbstractA 56‐year old male presenting with Acute Coronary Syndrome was found to have a large thrombus partially including a bypass graft bare metal stent. This thrombus was removed using a filter wire. The thrombus burden was so large that it caused extension through the filter wire basket, narrowly avoiding distal embolisation. © 2009 Wiley‐Liss, Inc.
Transradial renal stenting: Why and how
Authors: Trani Carlo , Tommasino Antonella , Burzotta Francesco 
Published: May 2009

AbstractTransradial vascular access for invasive procedures is gaining increasingly acceptance due to reduced access‐site complications and improved patient's comfort compared with transfemoral. However, the adoption of transradial access in peripheral vascular procedures is actually limited by anatomical and technical considerations. Yet, among all the peripheral vascular districts, the renal one seems to be particularly suitable for transradial approach. In this article, we discuss the rationale for preferring the radial approach instead of femoral and review the specific technical issues related to transradial renal artery stenting (RAS). © 2009 Wiley‐Liss, Inc.
Transcatheter aortic valve closure to treat severe aortic regurgitation in a patient failing stage I palliation for hypoplastic left heart syndrome
Authors: Riede Frank‐Thomas , Kostelka M. , Dähnert I. 
Published: May 2009

AbstractWe present a patient with borderline left ventricle, in whom significant aortic regurgitation after failed attempt of biventricular repair with balloon valvuloplasty and consecutive Norwood stage 1 procedure substantially contributed to persisting hemodynamic instability. Transcatheter closure of the aortic valve using an Amplatzer® septal occluder was performed and led to clinical stabilization. At medium‐term follow‐up, there was neither residual aortic regurgitation nor obstruction of the coronary artery origins.© 2009 Wiley‐Liss, Inc.
EXAFS Study of Dopant Ions with Different Charges in Nanocrystalline Anatase: Evidence for Space–Charge Segregation of Acceptor Ions
Authors: Knauth Philippe , Chadwick Alan V. , Lippens Pierre E. , Auer Gerhard 
Published: May 2009

AbstractNanocrystalline TiO2 (anatase) is an essential oxide for environment and energy applications. A combination of EXAFS spectroscopy and DFT calculations on a series of dopants with quite similar ion radius, but increasing ion charge, show boundary space charge segregation of acceptor cations. The picture illustrates the Fourier‐transformed EXAFS spectrum for Sn4+‐doped TiO2.magnified imageA series of dopants, including acceptor ions (Zn2+, Y3+), isovalent ions (Zr4+, Sn4+) as well as a donor ion (Nb5+), were studied by EXAFS spectroscopy in nanocrystalline TiO2 anatase powders and nanoceramics. Similar results were found for nanocrystalline powders and nanocrystalline ceramics, made by hot‐pressing the powders. Boundary segregation was observed for the acceptor ions yttrium and zinc, whereas tin, zirconium and niobium ions were placed on substitutional bulk sites and did not segregate, whatever their concentration. These results can be interpreted based on defect thermodynamics, in the framework of a space charge segregation model with positive boundary core, due to excess oxide ion vacancies, and negative space charge regions, where ionized acceptors are segregated.
Coming of Age: Sustainable Iron‐Catalyzed Cross‐Coupling Reactions
Authors: Czaplik Waldemar Maximilian , Mayer Matthias , Cvengroš Ján , von Wangelin Axel Jacobi 
Published: May 2009

AbstractIron‐catalyzed cross‐coupling reactions have, over the past years, developed to maturity and today are an integral part of the organic chemist's toolkit. They benefit from low costs, operational simplicity, and high reactivity and thus constitute the “green” sister of the palladium and nickel establishment. This timely Review traces back major achievements, discusses their mechanistic background, and highlights numerous applications to molecular synthesis.magnified imageIron‐catalyzed carbon–carbon bond‐forming reactions have matured to an indispensable class of reactions in organic synthesis. The advent of economically and ecologically attractive iron catalysts in the past years has stepped up the competition with the established palladium and nickel catalyst systems that have dominated the field for more than 30 years, but suffer from high costs, toxicity, and sometimes low reactivity. Iron‐catalyzed protocols do not merely benefit from economic advantages but entertain a rich manifold of reactivity patterns and tolerate various functional groups. The past years have witnessed a rapid development with ever‐more‐efficient protocols for the cross‐coupling between alkyl, alkenyl, alkynyl, aryl, and acyl moieties becoming available to organic chemists. This Review intends to shed light onto the versatility that iron‐catalyzed cross‐coupling reactions offer, summarize major achievements, and clear the way for further use of such superior methodologies in the synthesis of fine chemicals, bioactive molecules, and materials.
Changes in gene expression and morphology of mouse embryonic stem cells on differentiation into insulin‐producing cells in vitro and in vivo
Authors: Naujok Ortwin , Francini Flavio , Picton Sally , Bailey Clifford J. , Lenzen Sigurd , Jörns Anne 
Published: May 2009

AbstractBackgroundEmbryonic stem (ES) cells have the potential to produce unlimited numbers of surrogate insulin‐producing cells for cell replacement therapy of type 1 diabetes mellitus. The impact of the in vivo environment on mouse ES cell differentiation towards insulin‐producing cells was analysed morphologically after implantation.MethodsES cells differentiated in vitro into insulin‐producing cells according to the Lumelsky protocol or a new four‐stage differentiation protocol were analysed morphologically before and after implantation for gene expression by in situ reverse transcription polymerase chain reaction and protein expression by immunohistochemistry and ultrastructural analysis.ResultsIn comparison with nestin positive ES cells developed according to the reference protocol, the number of ES cells differentiated with the four‐stage protocol increased under in vivo conditions upon morphological analysis. The cells exhibited, in comparison to the in vitro situation, increased gene and protein expression of Pdx1, insulin, islet amyloid polypeptide (IAPP), the GLUT2 glucose transporter and glucokinase, which are functional markers for glucose‐induced insulin secretion of pancreatic beta cells. Renal sub‐capsular implantation of ES cells with a higher degree of differentiation achieved by in vitro differentiation with a four‐stage protocol enabled further significant maturation for the beta‐cell‐specific markers, insulin and the co‐stored IAPP as well as the glucose recognition structures. In contrast, further in vivo differentiation was not achieved with cells differentiated in vitro by the reference protocol.ConclusionsA sufficient degree of in vitro differentiation is an essential prerequisite for further substantial maturation in a beta‐cell‐specific way in vivo, supported by cell‐cell contacts and vascularisation. Copyright © 2009 John Wiley & Sons, Ltd.
Screening for binge eating disorders using the Patient Health Questionnaire in a community sample
Authors: Striegel‐Moore Ruth H. , Perrin Nancy , DeBar Lynn , Wilson G. Terence , Rosselli Francine , Kraemer Helena C. 
Published: May 2009

AbstractObjective:To examine the operating characteristics of the Patient Health Questionnaire eating disorder module (PHQ‐ED) for identifying bulimia nervosa/binge eating disorder (BN/BED) or recurrent binge eating (RBE) in a community sample and to compare true positive (TP) versus false positive (FP) cases on clinical validators.Method:Two hundred and fifty‐nine screen‐positive individuals and a random sample of 89 screen negative cases completed a diagnostic interview. Sensitivity, specificity, and positive predictive value (PPV) were calculated. TP and FP cases were compared using t‐tests and Chi‐square tests.Results:The PHQ‐ED had high sensitivity (100%) and specificity (92%) for detecting BN/BED or RBE, but PPV was low (10 or 19%). TP and FP cases did not differ significantly on frequency of subjective bulimic episodes, objective overeating, restraint, on BMI, and on self‐rated health.Discussion:The PHQ‐ED is recommended for use in large populations only in conjunction with follow‐up questions to rule out cases without objective bulimic episodes. © 2009 by Wiley Periodicals, Inc. Int J Eat Disord 2010
Eating disorders in patients with obsessive–compulsive disorder: Prevalence and clinical correlates
Authors: Sallet Paulo C. , de Alvarenga Pedro Gomes , Ferrão Ygor , de Mathis Maria Alice , Torres Albina R. , Marques Andrea , Hounie Ana G. , Fossaluza Victor , do Rosario Maria Conceição , Fontenelle Leonardo F. , Petribu Katia , Fleitlich‐Bilyk Bacy 
Published: May 2009

AbstractObjective:The objective is to evaluate the prevalence and associated clinical characteristics of eating disorders (ED) in patients with obsessive–compulsive disorder (OCD).Method:This is a cross‐sectional study comparing 815 patients with OCD. Participants were assessed with structured interviews and scales: SCID‐I, Y‐BOCS, Dimensional Y‐BOCS, BABS, Beck Depression and Anxiety Inventories.Results:Ninety‐two patients (11.3%) presented the following EDs: binge‐eating disorders [= 59 (7.2%)], bulimia nervosa [= 16 (2.0%)], or anorexia nervosa [= 17 (2.1%)]. Compared to OCD patients without ED (OCD‐Non‐ED), OCD‐ED patients were more likely to be women with previous psychiatric treatment. Mean total scores in Y‐BOCS, Dimensional Y‐BOCS, and BABS were similar within groups. However, OCD‐ED patients showed higher lifetime prevalence of comorbid conditions, higher anxiety and depression scores, and higher frequency of suicide attempts than did the OCD‐Non‐ED group. Primarily diagnosed OCD patients with comorbid ED may be associated with higher clinical severity.Discussion:Future longitudinal studies should investigate dimensional correlations between OCD and ED. © 2009 by Wiley Periodicals, Inc. Int J Eat Disord 2010