bluuebunny/crossref_metadata_2025_split huggingface dataset:
Suppression of Methanol Crossover in Pt-Dispersed Polymer Electrolyte Membrane for Direct Methanol Fuel Cells
Authors: Uchida Hiroyuki , Mizuno Yohsuke , Watanabe Masahiro 
Published: May 2005

Abstract
Suppression of methanol crossover in polymer electrolyte membranes is a key technology for direct methanol fuel cells (DMFCs). We have prepared a Nafion® 117 wherein platinum nanocrystals are highly dispersed and subsequently used it in a DMFC. This is expected to suppress the short-circuit reaction by oxidizing methanol at the Pt catalysts. Indeed, this is observed by the appreciable increase in the cathode potential, resulting from the reduced amount of methanol reaching the cathode.
Post-Metallocenes: New Bis(pyrrolyl-2-aldiminato) Titanium Complexes for Ethylene Polymerization
Authors: Yoshida Yasunori , Matsui Shigekazu , Takagi Yukihiro , Mitani Makoto , Nitabaru Masatoshi , Nakano Takashi , Tanaka Hidetsugu , Fujita Terunori 
Published: May 2005

Abstract
Two new bis(pyrrolyl-2-aldiminato) titanium complexes were synthesized and their structures determined by X-ray analyses. These complexes displayed high ethylene polymerization activity using MAO or Ph3C+B−(C6F5)4/iBu3Al as a cocatalyst. One of the complexes exhibited very high ethylene polymerization activity (14100 kg-polymer·mol-Ti−1·h−1) with very high molecular weight (Mv: 260.1 × 104) using MAO as a cocatalyst.
1,2-Cis Selective Glycosylation with Glycosyl Fluoride by Using a Catalytic Amount of Trifluoromethanesulfonic Acid (TfOH) in the Coexistence of Molecular Sieve 5Å (MS5Å)
Authors: Jona Hideki , Takeuchi Kazuya , Mukaiyama Teruaki 
Published: May 2005

Abstract
Stereoselective glycosylation of several glycosyl acceptors with 2,3,4,6-tetra-O-benzyl-β-d-glucopyranosyl fluoride was successfully carried out in diethyl ether by using a catalytic amount of trifluoromethanesulfonic acid (TfOH) in the coexistence of molecular sieve 5Å (MS5Å) to afford predominantly the corresponding α-linked disaccharides in high yields, which was applied to one-pot sequential syntheses of trisaccharides.
Photoreaction of Methyl (p-Nitrophenyl)diazoacetate in the Presence of an Electron-Donating Amine: Evidence for Intermediacy of the Carbene Radical Anion
Authors: Mizushima Tadashi , Ikeda Shingo , Murata Shigeru , Ishii Kunihiko , Hamaguchi Hiro-o 
Published: May 2005

Abstract
The product distribution in the photolysis of methyl (p-nitrophenyl)diazoacetate in MeCN–MeOH (9:1) was dramatically changed by the addition of an electron-donating amine, where the formation of the products derived from the carbene was quenched completely. On the basis of the direct observation of transient species and the dependence of the products on amine concentration, the reaction scheme involving a single electron transfer to afford the carbene radical anion is proposed.
Submicroscopic Morphological Changes of Laser Induced Surface Structure of Collagen, Tendon, and Gelatin Films
Authors: Sugiura Masaru , Tsunoda Katsunori , Yajima Hirofumi , Ishii Tadahiro , Ito Hiroshi , Nagai Yutaka 
Published: May 2005

Abstract
The formation of nap-type or wall-type structures on laser irradiated collagen related biopolymers films is reported. An atomic force microscope (AFM) allows a highly sensitive surface characterization of the same area of the irradiated sample between subsequent laser pulses. A change in surface topography was found to be dependent on the fluence and number of applied pulses. A successive measurement technique of AFM gave significant information on the mechanism of surface structure formation.
A New Reagent to Evaluate Optical Purity of Organic Amines by FAB Mass Spectrometry
Authors: Shizuma Motohiro , Imamura Hiroyuki , Takai Yoshio , Yamada Hitoshi , Takeda Tokuji , Takahashi Shigetoshi , Sawada Masami 
Published: May 2005

Abstract
Optical purity (enantiomeric excess: ee) of organic amine salts such as 1-(1-naphthyl)ethylamine hydrochloride was determined by FAB mass spectrometry using a deuterium-labeled/unlabeled enantiomer pair of a newly synthesized saccharide derivative (Dd-Gal2deg/Ll-Gal2deg-d24), podands.
Separation of Solid Polymers by Magneto-Archimedes Levitation
Authors: Kimura Tsunehisa , Mamada Shogo , Yamato Masafumi 
Published: May 2005

Abstract
Solid polymers, including polystyrene, poly(ethylene terephthalate), poly(methyl methacrylate), and so forth, suspended in a paramagnetic aqueous solution were levitated in different vertical positions under a magnetic field gradient. This phenomenon will be used for separating solid polymers.
Synthesis of Hole-Transporting Hydrazone Dendrimers
Authors: Nam Haehyun , Kang Dae Ho , Kim Jai Kyeong , Park Soo Young 
Published: May 2005

Abstract
Hole-transporting aromatic hydrazone dendrimers were synthesized by convergent method. Structures of dendrimers were characterized by NMR, IR, GC/MS (FAB+), and elemental analysis.
Efficient Method to Analyze NMR Spectra of Solutes in Liquid Crystals: The Use of Genetic Algorithm and Integral Curves
Authors: Takeuchi Hiroshi , Inoue Kaori , Ando Yuta , Konaka Shigehiro 
Published: May 2005

Abstract
A new approach is proposed for the analysis of complex NMR spectra of solutes in liquid crystals. In the analysis, NMR spectra are transformed to integral curves and spectral parameters are refined by means of genetic algorithm. The 1H-NMR spectra of ethanol, trans-azobenzene and tolan in ZLI 1132 were successfully analyzed by this method.
Novel Layered Silica/Organic Polymer Hybrid Films with the Interface Linked by Si–C Bonds
Authors: Shimojima Atsushi , Kuroda Kazuyuki 
Published: May 2005

Abstract
Inorganic-organic hybrids films composed of alternating layers of siloxane network and organic polymer assemblies linked by Si–C bonds have been prepared via co-hydrolysis and polycondensation of alkenyltriethoxysilane-tetraethoxysilane mixtures followed by organic polymerization, providing a new methodology for the design and construction of inorganic-organic nanostructured materials.
Preparation of Proton Conductive Phosphosilicate Gels Derived from 2-(Diethoxyphosphoryl)ethyltriethoxysilane
Authors: Kanzaki Takao , Matsuda Atsunori , Kotani Yoshinori , Tatsumisago Masahiro , Minami Tsutomu 
Published: May 2005

Abstract
The phosphosilicate gels derived from the mixture of 2-(diethoxyphosphoryl)ethyltriethoxysilane (DPTS) and tetraethoxysilane (TEOS) showed a high proton conductivity after a heat treatment at 450 °C. The high conductivity was brought by the generation of large amounts of isolated orthophosphoric acid in the gels due to the thermal decomposition of DPTS.
Synthesis and Charge Transfer Complexation of Chiral Polynitrohelicenes
Authors: Okubo Hitoshi , Nakano Daisuke , Yamaguchi Masahiko , Kabuto Chizuko 
Published: May 2005

Abstract
1,12-Dimethylbenzo[c]phenanthrene-5,8-dinitrile is nitrated at symmetrical positions giving 2,11-dinitro-, 4,9-dinitro, and 2,4,9,11-tetranitrohelicenes depending on the reaction conditions. The electron-deficient helicenes form charge-transfer (CT) complexes with pyrene in the solution as well as in the solid state. Crystal of the CT complex obtained from either (P)- or (±)-tetranitrohelicene possesses columnar structure but with different helicity, diameter, and pitch.
Copper-Catalyzed Oxidative Coupling of 2,4,6-Trimethylphenol with Oxygen
Authors: Oyaizu Kenichi , Saito Kei , Tsuchida Eishun 
Published: May 2005

Abstract
2,4,6-Trimethylphenol was oxidized with oxygen in the presence of (1,4,7-tribenzyl-1,4,7-triazacyclononane)copper(II) chloride as a catalyst to produce exclusively a coupled product stilbenequinone, without the formation of oxygenated products.
A Unique Concentration Dependence of NMR Longitudinal Relaxation Time of Water in Supercritical Carbon Dioxide
Authors: Kanakubo Mitsuhiro , Liew Chee C , Aizawa Takafumi , Kawakami Takanori , Sato Osamu , Ikushima Yutaka , Hatakeda Kiyotaka , Saito Norio 
Published: May 2005

Abstract
1H NMR longitudinal relaxation times (T1obs) of water in supercritical carbon dioxide were precisely measured as a function of water concentration (c) at 313.3 K and at 10 and 20 Mpa. 1/T1obs linearly decreased with increasing c up to ∼12 mol m−3, and then was less sensitive to c. Because the spin-rotation interaction is the predominant mechanism in T1obs, the concentration dependence reflects a change in the hydrogen bonding structure between water molecules in the solutions.
Crystallization of Calcium Phosphate Templated by α-Amino Acids Depending on Their Composition, Chain Length, and Enantiomerism
Authors: Kijima Tsuyoshi , Yamaguchi Keisuke , Miyata Akira , Yada Mitsunori , Machida Masato , Tanaka Junzo 
Published: May 2005

Abstract
α-Amino acids showed a characteristic templating effect on the crystallization of calcium phosphate at pH 7.0. Neutral but polar or basic group bearing amino acids yielded hydroxyapatite predominantly, whereas n-alkyl amino acids produced octacalcium phosphate (OCP) leading to an increase in crystallinity, expansion in cell volume and/or interlayer contraction depending on their chain length and enantiomerism. Aspartic acid, a short chain acidic amino acid, formed an amino acid complexed OCP with a significant increase of its crystallinity in the order of d ≈ l &lt; Dl, in contrast to the partial formation of a similar composite for glutamic acid.
Electrochemiluminescence of Luminol Generated at Self-Assembled Monolayer of Ferrocenylalkanethiol on Gold Electrode
Authors: Sato Yukari , Yabuki Soichi , Mizutani Fumio 
Published: May 2005

Abstract
Self-assembled monolayer of ferrocenylundecanethiol on gold electrode catalyzed electro-oxidative chemiluminescence from a luminol/hydrogen peroxide system.
Synthesis and Photochromic Property of cis-Azobenzene Complex with a Binuclear η6-Areneruthenium(II) Unit
Authors: Miyaki Yoshiharu , Onishi Takafumi , Kurosawa Hideo 
Published: May 2005

Abstract
A cis-azobenzene complex with a binuclear ruthenium(II) unit bridged by alkoxo ligands which are tethered to η6-arene donors (4) was synthesized from corresponding binuclear acetonitrile complex (3) and trans-azobenzene irradiated by UV light (300 nm &lt; λ &lt; 400 nm). On irradiation with visible light (λ &gt; 510 nm) in acetonitrile, 4 mostly dissociated to trans-azobenzene and 3 with the photostationary ratio 3/4 = 92/8.
Photochromism of Diarylethenes Having Isopropyl Groups at the Reactive Carbons. Thermal Cycloreversion of the Closed-Ring Isomers
Authors: Kobatake Seiya , Uchida Kingo , Tsuchida Eriko , Irie Masahiro 
Published: May 2005

Abstract
Diarylperfluorocyclopentenes having 2-isopropyl-5-phenylthiophene and 2-isopropyl-1-benzothiophene aryl groups underwent thermally reversible photochromism in solution. The photogenerated colored closed-ring isomers returned to the initial colorless open-ring isomers above 60 °C. The activation energies of the thermal cycloreversion were estimated to be 118 and 132 kJ/mol for the thiophene and benzothiophene derivatives, respectively.
Synthesis and X-ray Analysis of Mn–Mo Mixed Metal Oxide Cluster with Cubic Framework
Authors: Nishikawa Koji , Kinoshita Isamu , Nishioka Takanori , Isobe Kiyoshi 
Published: May 2005

Abstract
A reaction of the dinuclear oxometalate [Bun4N]2[Mo2O7] and (tacn)MnCl3 (tacn = 1,4,7-triazacyclononane) in water afforded a new cubic type Mn–Mo mixed metal oxide cluster of [{(tacn)Mn}2Mo4O16]·4H2O which has a moderate bleaching ability towards pinacyanol chloride dye.
Hydrogen Transfer in a Hydrogen-Bonded 1:2 Complex of Chloranilic Acid with 1,2-Diazine Studied by 35Cl NQR
Authors: Nihei Taka-aki , Ishimaru Shin’ichi , Ishida Hiroyuki , Ishihara Hideta , Ikeda Ryuichi 
Published: May 2005

Abstract
35Cl NQR frequencies and spin–lattice relaxation time, and 1H NMR spin–lattice relaxation time were measured on (chloranilic acid)-(1,2-diazine) 1:2 molecular complex to detect H-transfer motions in the H-bonded three molecular system. Only a single H-jump mode was observed by 1H NMR, whereas three kinds of H-transfer modes were obtained in 35Cl NQR in good agreement with the prediction.
The Chemistry of Alkylstrontium Halide Analogues: Barbier-type Alkylation of Imines with Alkyl Halides
Authors: Miyoshi Norikazu , Ikehara Daitetsu , Kohno Tadashi , Matsui Aki , Wada Makoto 
Published: May 2005

Abstract
The chemistry of alkylstrontium halide analogues was examined. In the presence of metallic strontium, the Barbier-type alkylation of imines with alkyl iodides proceeded smoothly at room temperature under an argon atmosphere to afford the corresponding alkylated amines in good yields.
Greatly Enhanced Photovoltaic Performance by Introducing Hydroxyl or Benzene Ring into D–π–A Dye Framework: Dye Sensitized Solar Cells Based on Rhodanine Dyes
Authors: Chen Yousheng , Li Chao , Zeng Zhanghua , Wang Weibo , Wang Xuesong , Zhang Baowen 
Published: May 2005

Abstract
The introduction of hydroxyl group into aniline moiety (electron donor, D) or benzene ring into the conjugation chain (π bridge) of D–π–A dye framework with rhodanine-3-acetic acid as electron acceptor (A) improved remarkably the monochromatic incident photon-to-current conversion efficiencies (IPCEs) and overall power conversion efficiencies (η), fully demonstrating the potential of molecular design in developing efficient D–π–A dyes for dye-sensitized solar cell applications.
A Remarkable CoIIIMnIIAgI Heterometallic Aggregate with l-Cysteinate That Accommodates Chiral Cobalt(III) Octahedra in a 1D Channel
Authors: Aridomi Takashi , Hirotsu Masakazu , Yoshimura Takashi , Kawamoto Tatsuya , Konno Takumi 
Published: May 2005

Abstract
Treatment of an aqueous solution of Δl-[Co(l-Hcys-N,S)(en)2](ClO4)2 (l-cys = l-cysteinate) with AgNO3 under a neutral condition, followed by the addition of excess Mn(NO3)2, led to the formation of a CoIIIMnIIAgI coordination polymer, {(Δl)5-[Ag2Mn3(NO3)2(H2O)10{Co(l-cys-N,S)(en)2}5](NO3)6.5(ClO4)4.5}n (1). The crystal structure of 1, which accommodates Δl-[Co(l-cys-N,S)(en)2]+ molecules in a 1D channel, was determined by X-ray crystallography.
Autoantibodies against intrinsic factor (IF) measured with an ELISA using recombinant human IF as both catching and detecting reagent
Authors: Nexo Ebba , Nooroya Ben , Hvas Anne-Mette , Christensen Anna Lisa , Waters Harry 
Published: May 2005

AbstractThe aim was to develop and validate an assay for measuring autoantibodies against human intrinsic factor (IF). For this purpose 1.25pmol of recombinant IF was coupled to each well. Samples (100μL of plasma diluted 1:1) were incubated for 1h, followed by 30min with the detection reagent (biotinylated IF, 3.3pmol/mL). Samples were obtained from healthy blood donors (n=141) and patients with suspected vitamin B
Antibody titer against malondialdehyde-modified LDL compares with HDL cholesterol concentration in identifying angiographically verified coronary artery disease. Comparison of tests by ROC analysis
Authors: Rontu Riikka , Metso Saara , Jaakkola Olli , Nikkilä Matti , Jokela Hannu , Lehtimäki Terho 
Published: May 2005

AbstractAntibody titer against malondialdehyde (MDA)-modified low-density lipoprotein (LDL) has been found to be associated with atherosclerosis, but it has not been established whether it would detect subjects with coronary artery disease (CAD). In the present study, receiver-operating characteristic (ROC) analysis was used to compare the diagnostic accuracy of the antibody titer against MDA-modified LDL and high-density lipoprotein (HDL) and LDL cholesterol levels in discrimination between subjects with (n=51) and without (n=35) angiographically verified 3-vessel CAD. As a result, the antibody titer against MDA-modified LDL was lower in subjects with CAD compared with subjects without CAD (p<0.0001). The area under the ROC plot was 0.822 (95% CI, 0.727 to 0.918) for the antibody titer and 0.769 (95% CI, 0.661 to 0.876) for the HDL cholesterol concentration. Both the antibody titer and the plasma HDL cholesterol level were more accurate markers of CAD than the LDL cholesterol level. As a conclusion, our results indicate that the antibody titer against MDA-modified LDL discriminates between subjects with widespread CAD and those without CAD similarly as the HDL cholesterol concentration. Moreover, the antibody titer against MDA-modified LDL is inversely correlated with the risk of severe CAD.
α-Tocopherol as an antiretroviral therapy supplement for HIV-1-infected patients for increased lymphocyte viability
Authors: de Souza Júnior Odilon , Treitinger Arício , Baggio Giovana Lotici , Michelon Cleonice , Verdi Júlio Cesar , Cunha Joel , Ferreira Silvia I. A. C. P. , Spada Celso 
Published: May 2005

AbstractThe aim of our study was to evaluate the benefits of supplementation with 800mg/day of α-tocopherol with regard to cellular viability in HIV-1 seropositive patients undergoing anti-retroviral therapy. A total of 29 patients participated in the study, of whom 14 were given the supplement and 15 a placebo. The analyses were carried out before treatment commenced and after 60, 120 and 180days. The plasma levels ofHIV-1 RNA showed a significant decrease as a consequence of treatment time in the groups studied (p=0.0001), although the difference between the treatments over time was not verified (p=0.7343). The percentage of viable lymphocytes showed a significant increase as a consequence of treatment time in both groups studied (p=0.0002) and a significant difference between the treatments over time (p=0.0472). The percentage of lymphocytes in apoptosis showed a significant reduction over time (p=0.0003), as well as a significant difference between the treatments over time (p=0.0321). The significant increase in cellular viability indicates that supplementation with α-tocopherol offers an additional positive effect on cellular preservation in HIV-1 individuals undergoing anti-retroviral therapy; however, it represents an additional risk of anti-retroviral therapeutic failure, possibly due to drug-drug interaction involving up-regulation of metabolic clearance.
Estimation of the limit of detection with a bootstrap-derived standard error by a partly non-parametric approach. Application to HPLC drug assays
Authors: Linnet Kristian 
Published: May 2005

AbstractA recently proposed procedure for estimating the limit of detection (LoD) of an assay using a partly non-parametric approach is applied to five HPLC drug assays. The non-parametrically determined 95th percentile of the blank measurements (LoB) is obtained as the value of the
Pitfall in the high-throughput quantification of whole blood cyclosporin A using liquid chromatography-tandem mass spectrometry
Authors: Vogeser Michael , Spöhrer Ute 
Published: May 2005

AbstractIn a growing number of laboratories the technique of liquid chromatography-tandem mass spectrometry is used for the quantification of cyclosporin A in whole blood, employing cyclosporin D as the internal standard. Cyclosporin A is extensively metabolized in vivo; in liquid chromatography-tandem mass spectrometry respective metabolites can give rise to both parent and product ions that are isobaric with ions commonly used for the detection of cyclosporin A and cyclosporin D, respectively. In this article it is demonstrated that limited chromatography with co-elution of such metabolites together with cyclosporin A and cyclosporin D can lead to incorrect results.
Evaluation of a rapid bedside test for the quantitative determination of C-reactive protein
Authors: Esposito Susanna , Tremolati Elena , Begliatti Enrica , Bosis Samantha , Gualtieri Laura , Principi Nicola 
Published: May 2005

AbstractRegardless of its origin, any condition associated with inflammation is accompanied by an increase in serum C-reactive protein levels. This study compared the results of a rapid test for the bedside assay of C-reactive protein (QuikRead CRP, Orion Corporation, Orion Diagnostica, Espoo, Finland) with those of a standard laboratory assay in samples taken from 231 children aged less than 14years (126 males; median age 4.7years) attending the Emergency Department of Milan University's Institute of Pediatrics because of acute respiratory infection. The two methods showed similar median C-reactive protein levels (standard laboratory assay: 34.7mg/L, range 4–199mg/L; QuikRead CRP: 33.3mg/L, range <8–196mg/L; p=0.779) and a similar distribution of children with C-reactive protein levels of <20mg/L, 20–70mg/L and >70mg/L. This study shows for the first time that the rapid QuikRead CRP test can be performed at the bedside or in an outpatient clinic and, in less than 5min, gives the same quantitative results as those obtained using a more complex routine laboratory method.
Small-scale actinide(III) partitioning processes in miniature hollow fibre modules
Authors: Geist Andreas , Weigl Michael , Gompper Klaus 
Published: May 2005

Summary
Miniature hollow fibre modules were fabricated and used as phase contactors for chemical liquid–liquid extraction. They were tested for americium(III) selective extraction, using three different extractants of relevance to the European Partitioning and Transmutation strategy. Americium could be removed from the feed phase to >99.9% in all cases. Only few ten millilitres of feed phases were consumed running a test. This is the major advantage of the miniature hollow fibre modules over commercially available modules which have been used previously.
Effect of ammonium, carbonate and fluoride concentration on the uranium recovery by resins
Authors: Ladeira Ana C. Q. , Morais Carlos A. 
Published: May 2005

Summary
Uranium in solution can be precipitated over a wide pH range, from acidity and alkalinity, depending upon the solution and the precipitant used. The precipitate is generally filtered and the solution resultant contains uranium that should be recovered. This work is aimed at the selection of an appropriate resin for uranium recovery from alkaline solutions in the presence of ammonia, carbonate and fluoride. The ability of uranium extraction of 3 types of polymeric strong base resin was assessed. Laboratory solutions were prepared to determine the influence of the ions like ammonia, carbonate and fluoride on the uranium recovery by resins. The uranium concentration was 100 mg/L and the solution pH ranged from 9.2 to 10.4. The results, obtained by batch experiments, showed that excess of carbonate and fluoride completely inhibit uranium uptake in the pH range studied. Even low concentrations of fluoride and carbonate decrease uranium adsorption by resins. The optimum concentration was below 2.5 g/L (0.04 mol/L) and 5.0 g/L (0.26 mol/L) for carbonate and fluoride, respectively. The presence of high concentration of ammonia up to 20 g/L (1.20 mol/L) did not inhibit the uranium exchange process. Among the three types of resins studied IRA 910U was the most promising adsorbent for uranium at the conditions employed in this work.
Release of contaminant U(VI) from soils
Authors: Zheng Zuoping , Wan Jiamin 
Published: May 2005

Summary
The retention, mobility, and bio-availability of U(VI) in contaminated soils depend strongly on release of U(VI). Laboratory batch experiments were performed to evaluate the factors (ionic strength of the extraction solution and solution volume to solid mass ratio) controlling the release of U(VI) from contaminated soil at Oak Ridge, Tennessee. Increase in ionic strength shows an evident effect on U(VI) release as indicated by the increase in release rates and associated release mass of U(VI). The ratio of solution volume to solid mass (V/M) has a significant impact on the release of U(VI). Increase in the V/M ratio shows a negligible effect on the U(VI) release over a 4-day period. However, at Day 30 and Day 120, larger V/M ratios cause greater U(VI) release. The maximum U(VI) concentrations observed in the release experiments are in the range of schoepite solubility estimated under conditions relevant to the experiments, suggesting that schoepite solubility primarily controls the U(VI) release, but that solubilization and desorption effects cannot be distinguished using macroscopic methods.