bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isolation and Crystallographic Characterization of Allylindium Species Generated from Allyl Halide and Indium(0)
Authors: Yasuda Makoto , Haga Masahiko , Baba Akio 
Published: September 2009

AbstractThe reaction of cinnamyl bromide with indium(0) gave two allylindium species, cinnamylindium dibromide and dicinnamylindium bromide. Either species were isolated after complexation of appropriate pyridine‐type Lewis bases. The use of 3,5‐dibromopyridine (Br2py) as a Lewis base gave cinnamylindium dibromide with two Br2py ligands. Dicinnamylindium bromide was isolated with 4‐(dimethylamino)pyridine (Me2Npy) ligands. In both cases, the indium atom showed a trigonal‐bipyramidal coordination sphere with the cinnamyl group(s) and bomine atom(s) in equatorial and the pyridine‐type ligands in axial positions. The cinnamylindium bromide transformed to dicinnamylindium bromide with formation of InBr3 in the presence of Me2Npy. The dicinnamylindium bromide had a higher reactivity than the monoallyl compound for carbonyl addition.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Prussian Blue/Multiwalled Carbon Nanotube Hybrids: Synthesis, Assembly and Electrochemical Behavior
Authors: Zhai Junfeng , Zhai Yueming , Wen Dan , Dong Shaojun 
Published: September 2009

AbstractPrussian blue/carbon nanotube (PB/CNT) hybrids with excellent dispersibility in aqueous solutions were synthesized by adding CNTs to an acidic solution of Fe3+, [Fe(CN)6]3− and KCl. Fourier transform infrared spectroscopy, UV‐vis absorption spectroscopy and scanning electron microscopy were employed to confirm the formation of PB/CNT hybrids. The PB nanoparticles formed on the CNT surfaces exhibit a narrow size distribution and an average size of 40 nm. The present results demonstrate that the selective reduction of Fe3+ to Fe2+ by CNTs is the key step for PB/CNT hybrid formation. The subsequent fabrication of the PB/CNT hybrid films was achieved by layer‐by‐layer technique. The thus‐prepared PB/CNT hybrid films exhibit electrocatalytic activity towards H2O2 reduction.
Self‐Assembled Prussian Blue Nanoparticles Based Electrochemical Sensor for High Sensitive Determination of H2O2 in Acidic Media
Authors: Razmi H. , Mohammad‐Rezaei R. , Heidari H. 
Published: September 2009

AbstractIn this paper, self‐assembled Prussian blue nanoparticles (PBNPs) on carbon ceramic electrode (CCE) were developed as a high sensitive hydrogen peroxide (H2O2) electrochemical sensor. The PBNPs film was prepared by a simple dipping method. The morphology of the PBNPs‐modified CCE was characterized by scanning electron microscopy (SEM). The self‐assembled PB film exhibited sufficient mechanical, electrochemical stability and high sensitivity in compare with other PB based H2O2 sensors. The sensor showed a good linear response for H2O2 over the concentration range 1 μM–0.26 mM with a detection limit of ca. 0.7 μM (S/N=3), and sensitivity of 754.6 mA M−1 cm−2. This work demonstrates the feasibility of self‐assembled PBNPs‐modified CCE for practical sensing applications.
Sensorimotor network rewiring in mild cognitive impairment and Alzheimer's disease
Authors: Agosta Federica , Rocca Maria Assunta , Pagani Elisabetta , Absinta Martina , Magnani Giuseppe , Marcone Alessandra , Falautano Monica , Comi Giancarlo , Gorno‐Tempini Maria Luisa , Filippi Massimo 
Published: September 2009

AbstractThis study aimed at elucidating whether (a) brain areas associated with motor function show a change in functional magnetic resonance imaging (fMRI) signal in amnestic mild cognitive impairment (aMCI) and Alzheimer's disease (AD), (b) such change is linear over the course of the disease, and (c) fMRI changes in aMCI and AD are driven by hippocampal atrophy, or, conversely, reflect a nonspecific neuronal network rewiring generically associated to brain tissue damage. FMRI during the performance of a simple motor task with the dominant right‐hand, and structural MRI (i.e., dual‐echo, 3D T1‐weighted, and diffusion tensor [DT] MRI sequences) were acquired from 10 AD patients, 15 aMCI patients, and 11 healthy controls. During the simple‐motor task, aMCI patients had decreased recruitment of the left (L) inferior frontal gyrus compared to controls, while they showed increased recruitment of L postcentral gyrus and head of L caudate nucleus, and decreased activation of the cingulum compared with AD patients. Effective connectivity was altered between primary sensorimotor cortices (SMC) in aMCI patients vs. controls, and between L SMC, head of L caudate nucleus, and cingulum in AD vs. aMCI patients. Altered fMRI activations and connections were correlated with the hippocampal atrophy in aMCI and with the overall GM microstructural damage in AD. Motor‐associated functional cortical changes in aMCI and AD mirror fMRI changes of the cognitive network, suggesting the occurrence of a widespread brain rewiring with increasing structural damage rather than a specific response of cognitive network. Hum Brain Mapp, 2010. © 2009 Wiley‐Liss, Inc.
Role of A‐type potassium currents in excitability, network synchronicity, and epilepsy
Authors: Fransén Erik , Tigerholm Jenny 
Published: September 2009

AbstractA range of ionic currents have been suggested to be involved in distinct aspects of epileptogenesis. Based on pharmacological and genetic studies, potassium currents have been implicated, in particular the transient A‐type potassium current (KA). Epileptogenic activity comprises a rich repertoire of characteristics, one of which is synchronized activity of principal cells as revealed by occurrences of for instance fast ripples. Synchronized activity of this kind is particularly efficient in driving target cells into spiking. In the recipient cell, this synchronized input generates large brief compound excitatory postsynaptic potentials (EPSPs). The fast activation and inactivation of KA lead us to hypothesize a potential role in suppression of such EPSPs. In this work, using computational modeling, we have studied the activation of KA by synaptic inputs of different levels of synchronicity. We find that KA participates particularly in suppressing inputs of high synchronicity. We also show that the selective suppression stems from the current's ability to become activated by potentials with high slopes. We further show that KA suppresses input mimicking the activity of a fast ripple. Finally, we show that the degree of selectivity of KA can be modified by changes to its kinetic parameters, changes of the type that are produced by the modulatory action of KChIPs and DPPs. We suggest that the wealth of modulators affecting KA might be explained by a need to control cellular excitability in generaland suppression of responses to synchronicity in particular. Wealso suggest that compounds changing KA‐kinetics may be used to pharmacologically improve epileptic status. © 2009 Wiley‐Liss, Inc.
Autoregulation of co‐chaperone BAG3 gene transcription
Authors: Gentilella Antonio , Khalili Kamel 
Published: September 2009

AbstractThe Bcl‐2‐associated athanogene, BAG, protein family through their BAG domain associates with the heat shock protein 70 (HSP‐70) and modulates its chaperone activity. One member of this family, BAG3, appears to play an important role in protein homeostasis, as its expression promotes cell survival. Expression of BAG3 is enhanced by a variety of stress‐inducing agents. Here we describe a role for BAG3 to modulate transcription of its own promoter through a positive feedback loop involving its 5′‐UTR sequence. Activation of the BAG3 promoter is mediated by the BAG domain and is independent of BAG3 association with the UTR sequence. Autoactivation of the BAG3 gene is observed in several cultures of human glial cells including gliomas, but not in several other non‐glial cell lines such as He La and others. Results from cell fractionation and immunocytochemistry showed BAG3 in the cytoplasm as well as the nuclei of glial cells. These observations suggest that BAG3 gene expression is controlled by its own product and that this may be critical for the biological activity of BAG3 in some cell types. J. Cell. Biochem. 108: 1117–1124, 2009. © 2009 Wiley‐Liss, Inc.
Compensatory induction of the TRPV6 channel in a calbindin‐D9k knockout mouse: Its regulation by 1,25‐hydroxyvitamin D3
Authors: Lee Geun‐Shik , Jung Eui‐Man , Choi Kyung‐Chul , Oh Goo Taeg , Jeung Eui‐Bae 
Published: September 2009

AbstractActive calcium transport is carried out by calcium channel proteins, cytosolic buffering or transfer proteins, and pump proteins. Several components of this transport system have recently been verified using gene knockout (KO) models. We previously generated calbindin‐D9k (CaBP‐9k) KO mice and reported that induction of expression of some calcium transport proteins can compensate for the CaBP‐9k gene deficiency. In the current study, we have further clarified the compensatory regulation of calcium transport genes by two calcium regulating hormones, 1,25‐dihydroxyvitamin D3 (1,25(OH)2D3) and parathyroid hormone (PTH), in CaBP‐9k KO mice, because the levels of these hormones differ between the KO and wild‐type (WT) mice. The induction of transient receptor potential cation channel, subfamily V, member 6 (TRPV6) in the duodenum was observed in adult KO male mice but induction was not modified by physiologic doses of 1,25(OH)2D3. Duodenal TRPV6 transcription in WT and female KO mice were modulated by 1,25(OH)2D3 in a dose‐dependent manner. This compensatory gene induction was not detected in the mice fed a vitamin D3‐deficient diet. Compensatory gene induction was not affected by PTH. Thus, the compensatory expression of duodenal TRPV6 in the KO male mice may be tightly correlated with serum 1,25(OH)2D3. Vitamin D receptor (VDR) transcription and protein levels were measured to examine whether VDR expression mediates differential regulation of duodenal TRPV6 between WT and KO mice, but expression and levels of VDR were similar in both genotypes. The compensatory TRPV6 transcripts in KO mice may be modulated by endogenous vitamin D3 via other factors of VDR signaling complexes. J. Cell. Biochem. 108: 1175–1183, 2009. © 2009 Wiley‐Liss, Inc.
Expression patterns of collagen types I and III in the capsule of a rat knee contracture model
Authors: Hagiwara Yoshihiro , Ando Akira , Onoda Yoshito , Matsui Hiroyuki , Chimoto Eiichi , Suda Hideaki , Itoi Eiji 
Published: September 2009

AbstractOur objective was to determine the changes in expression of collagen types I and III in the capsule of a rat knee contracture model. The unilateral knee joints of adult male rats were rigidly immobilized at 150° of flexion using a rigid plastic plate and screws for 3 days, 1, 2, 4, 8, and 16 weeks (immobilized group). Sham‐operated animals had holes drilled in the femur and tibia with screws inserted without a plate (control group). The expression patterns of collagen types I and III in the anterior and posterior capsule were evaluated by in situ hybridization (ISH), quantitative real‐time polymerase chain reaction (qPCR), immunohistochemistry (IHC), and Western blotting (WB). Expressions of collagen types I and III were decreased after immobilization compared to the control group by ISH and qPCR. The expression was not changed after immobilization compared to the control group by IHC and WB. The expression of mRNA and protein levels of collagen types I and III were not increased after immobilization, which indicated that accumulation of the two types of collagen was not the etiology of joint contracture. Another process, such as capsule and synovial adhesions, may be one possible cause of joint contracture. © 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:315–321, 2010
Functional properties of Lactobacillus acidophilus metabolites
Authors: Brzozowski Bartosz , Bednarski Włodzimierz , Dziuba Bartłomiej 
Published: September 2009

AbstractBACKGROUND: This study addressed the characteristics of metabolites synthesized by Lactobacillus acidophilus 5e2, with particular attention paid to exopolysaccharides, biosurfactants, proline peptidases and antibacterial compounds.RESULTS: The strain Lb. acidophilus 5e2 synthesizes low‐molecular‐mass polysaccharides (340 kDa) constituted by glucose, galactose and glucosamine at a ratio of 3.3:2.8:1.0, as well as biosurfactants with a molecular mass of 32 kDa built from a protein fraction, a polysaccharide fraction and phosphate groups. It additionally synthesizes extra‐ and intracellular proline peptidases, including prolyl endopeptidase and thermostable low‐molecular‐mass (<3.5 kDa) compounds with antimicrobiological activity against Escherichia coli strains.CONCLUSION: The strain Lb. acidophilus 5e2 may be applied to the production of functional food. Copyright © 2009 Society of Chemical Industry
New SPE loading material for affinity‐based separation of cyclodextrins from drug:CD complexes in order to overcome Beer's law deviations
Authors: Rozou Stavroula , Raftopoulos Panayiotis , Hatziantoniou Sophia , Antoniadou‐Vyza Ekaterini 
Published: September 2009

AbstractMolecular inclusion of guest molecules within CDs is known to alter guest molecule spectrophotometric absorptivity, making their determination, based on spectrophotometric data, inaccurate. Therefore specific analytical methods capable of quantifying the drugs as free molecules must be developed and validated. SPE was selected to simplify sample and avoid more time‐consuming alternatives. A new solid phase was synthesized and characterized by infrared spectrometry, differential scanning calorimetry and elemental analysis. The competitive complexation of adamantane groups immobilized on the silica substrate facilitates drug:CD complex dissociation and elimination of CD from samples. The drug molecules, now free from CD, can be easily analysed by an already available HPLC method. This new SPE loading material was employed in the determination of ketoprofen in its CD complex as a representative example of the utility of this novel material. The calculated analytical errors were reduced from a maximum of 20.79% (without SPE) to a minimum of 3.99%.
A liquid chromatographic method optimization for the assessment of low and high molar mass carbonyl compounds in wines
Authors: de Azevedo Luciana C. , Reis Marina M. , Pereira Giuliano E. , da Rocha Gisele O. , Silva Luciana A. , de Andrade Jailson B. 
Published: September 2009

AbstractCarbonyl compounds (CC) play an important role in beverage aroma since they may affect flavor of wines, brandies, and beers, among others. For this reason, it is necessary to identify and quantify CC through adequate analytical techniques. This study is a proposal of both developing and optimization of a new analytical methodology that allows investigate C1–C8 CC in wines simultaneously by quantifying even those ones that are predominantly present in the adduct form hydroxylalkylsulfonic acids (HASA). The HASA dissociation is undertaken by specific alkaline media (pH 11). The developed methodology employed the LC with UV/VIS detection (λ = 365 nm) technique under gradient elution in the way to reach both free‐CC and bound‐CC quantification. Results showed that binary gradient system using eluent A (MeOH/ACN/H2O 74.5:0.5:25% v/v/v) and eluent B (MeOH) reached the best separation condition of both lower and higher molecular mass CC. This proposed method allowed simultaneous quantification of formaldehyde, acetaldehyde, propanone, furfuraldehyde, butyraldehyde, benzaldehyde, hexanaldehyde, 2‐ethyl‐hexanaldehyde, E‐pent‐2‐en‐1‐al, and cyclohexanone – all of them were found in white wine (Moscato Canelli) and red wine (Shiraz) produced in the São Francisco Valley, in the Northeastern Region of Brazil – although this optimized method may probably be suitable for quantification of propionaldehyde, isobutyraldehyde, heptanaldehyde, octanaldehyde, benzaldehyde, and E‐hex‐2‐en‐1‐al as well. We could not prove if this method is also able to determine the latter CC group since we have not found these substances present in detectable levels in our real samples considered in this study.
Properties and Prospects of High Brightness Solid State Lasers
Authors: Vollertsen Frank 
Published: September 2009

AbstractThe new generation of solid state lasers like disc and fiber lasers showed an extraordinary quick development with respect to power, beam quality and price. It is shown that recent technology enables welding with a considerable lower energy consumption than for conventional gas metal arc welding. Besides the efficiency, the most important feature is the beam quality, which can be used for remote applications and welding at high speed. on the other hand, some challenges have to be solved, like thermal distortion of the beam shaping optics, humping and low homogeneity of the welds.
Fiber Lasers – Unlimited Opportunities?
Authors: Rütering Markus , Rath Wolfram 
Published: September 2009

AbstractTechnology is important as its interpretation is the base to consider costs. For the herewith discussed fiber lasers we should mainly look at the fiber laser module itself, being the power generator, the pump source for this generator and some accessories as well. Finally the application capabilities will round this picture. Fiber lasers are in competition to other technologies not being the answer to all questions. as rofin in its Macro division does manufacture almost all market relevant laser technologies, named CO2 lasers, disc‐lasers, rod‐lasers, diode lasers as well as the discussed fiber lasers, rofin serves as an unbiased consultant for the customers. Comparing those different lasers is not always possible. With differences in power level, beam quality and even more important wavelength, the application capability often tells the story and thus we'd like to rather concentrate on the fiber lasers than starting a comparison of products.
Fast computation of shielding effectiveness of metallic enclosures with apertures and inner elements
Authors: Lozano‐Guerrero Antonio J. , Díaz‐Morcillo Alejandro , García‐Fernández Miguel Á. , Balbastre‐Tejedor Juan V. 
Published: September 2009

AbstractIn this study, radiated immunity and emission of a metallic box with apertures have been evaluated through a fast approach. The influence of printed circuit boards inside the enclosure has been studied and also the effect of placing conductive polymer sheets in the housing to characterize the behavior of these materials used nowadays for shielding cabinets. Measurements have been carried out in anechoic chamber to evaluate the approximated technique showing its limitations and advantages. As good agreement has been found between simulations and measurements, this approach can be used for design or optimization purposes with the main advantage of reduced time calculations. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2832–2836, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24745
Perfectly matched layers backed by the second‐order waveguide impedance boundary condition for the time‐domain finite‐element solution of waveguide problems
Authors: Du L. , Chen R. S. , Yang Y. 
Published: September 2009

AbstractThe second‐order waveguide impedance boundary condition is first combined with the perfectly matched layer (PML) for the time‐domain finite‐element (TDFE) simulation of waveguide problems. The formulation is validated by numerical examples. The results clearly show that the reflection errors obtained by the second‐order waveguide impedance boundary condition are less then −20 dB, and the PML backed with the second‐order waveguide impedance boundary condition has a better absorbing effect than the PML backed with the perfect electrically conducting (PEC) wall. Under the same constant conductivity situation, PML terminated with the second‐order waveguide impedance boundary condition can reduce about 10 cells of the PML thickness when compared with the PML terminated by PEC wall. Therefore, the proposed boundary conduction can reduce the number of the unknowns and provide an effective mesh truncation method for the time‐domain finite‐element method solution of waveguide problems. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2870–2874, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24774
Toward a 60‐GHz wireless, low‐power, high‐throughput memory access system
Authors: Guidotti Daniel , Chowdhury Arshad , Chien Hung‐Chang , Fan Shu‐Hao , Chang Gee‐Kung 
Published: September 2009

AbstractWe propose a network of bidirectional, wireless data channels, operating in the frequency band of 55–65 GHz, as an efficient means to transfer data between processors and memory nodes distributed on separate boards within the computer box. We address channel throughput, power dissipation, form factor, and crosstalk abatement. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2969–2973, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24779
Novel dual band‐notched ultra‐wideband antenna
Authors: Fan Fangfang , Yan Zehong , Zhang Tianling , Song Yue 
Published: September 2009

AbstractThis article presents the design of a novel ultra‐wideband microstrip‐fed planar monopole antenna with dual band‐notched characteristics. The proposed antenna achieved an impedance bandwidth of 3.1–11.7 GHz with VSWR <2, except the bandwidths of 3.3–4.0 GHz for WiMAX and 5.5–6.3 GHz for WLAN application. By etching a u‐shaped slot in the radiating patch and a u‐shaped defected ground structure in the ground plane, the dual stopbands for WiMAX and WLAN application can be obtained, respectively. The fabricated antenna shows the broadband impedance‐matching, stable gain, good group delay, and near omnidirectional radiation pattern. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2973–2976, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24780
Wide‐band double‐ring resonator with transmission zeros and resonances using high permittivity aluminum nitride substrate
Authors: Liu Ji‐Chyun , Wang Jhih‐Wei , Das Atanu , Chang Liann‐Be 
Published: September 2009

AbstractA novel double‐ring resonator of the double square loop configuration is introduced to achieve the performance of the wideband bandpass filter. To obtain lower insertion loss (0.97 dB), deeper transmission zero level (35.4/34.6 dB), and wider bandwidth (43.22%), using the double square loop and aluminum nitride substrate are proposed. The transmission zeros and resonances are determined and studied in this article. Simulation and measurement results including surface current distributions and frequency responses are presented and discussed. It can be applied to 1.8 to 2.7 GHz high thermal conductivity systems. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2878–2882, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24787
Low‐cost active transceiver for WLAN applications
Authors: Amar N. , Tazón A. , García J. A. , Cabria L. , Rodriguez‐Tellez J. 
Published: September 2009

AbstractIn this article, a new low‐cost active antenna for WLAN sensor applications is presented. The proposed system operates as a transceiver whereby the received coded data signal from the broadside direction is retransmitted over a wide area in other directions. This is performed so that a null response at the main pointing angle is maintained. It is formed by a three elements series array connected to high‐ performance FET‐based down‐ and up‐converters. The performance of the proposed architecture is verified using experimental results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2882–2884, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24788