bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modification of Chiral Monodentate Phosphine (MOP) Ligands for Palladium-Catalyzed Asymmetric Hydrosilylation of Styrenes
Authors: Hayashi Tamio , Hirate Seiji , Kitayama Kenji , Tsuji Hayato , Torii Akira , Uozumi Yasuhiro 
Published: May 2005

Abstract
In the palladium-catalyzed asymmetric hydrosilylation of styrene with trichlorosilane, several chiral monophosphine ligands, (R)-2-diarylphosphino-1,1′-binaphthyls (2), were examined for their enantioselectivity. The highest enantioselectivity was observed in the reaction with (R)-2-bis[3,5-bis(trifluoromethyl)phenyl]phosphino-1,1′-binaphthyl (2g), which gave (S)-1-phenylethanol of 98% ee after oxidation of the hydrosilylation product.
A Novel Organic Conductor with Three-Dimensional Molecular Array: (TM-TPDS)2AsF6
Authors: Misaki Yohji , Kaibuki Tadahiro , Taniguchi Masateru , Tanaka Kazuyoshi , Kawamoto Tadashi , Mori Takehiko , Nakamura Toshikazu 
Published: May 2005

Abstract
The title material, where TM-TPDS is 2-[4,5-bis(methylthio)-1,3-diselenol-2-ylidene]-5-(thiopyran-4-ylidene)-1,3,4,6-tetrathiapentalene, has three-dimensional (3D) donor array, in which 1D donor columns are tetragonally arranged with each other. It shows metal-like conducting behavior down to TMI = 100 K.
Mechanism for NO Photooxidation over the Oxygen-Deficient TiO2 Powder under Visible Light Irradiation
Authors: Nakamura Isao , Sugihara Shinichi , Takeuchi Koji 
Published: May 2005

Abstract
The mechanism for the photooxidation of NO over hydrogen plasma-treated TiO2 under visible light irradiation was studied by in situ Fourier transform infrared spectroscopy. It was found that the oxidation of NO over plasma-treated TiO2 under visible light proceeded consecutively as NO → NO2− → NO3−, where the oxidation process of NO2− to NO3− was newly created by irradiation of visible light.
Molecular Recognition and Photopolymerization of Nucleobase Monolayer Containing Diacetylene Group at the Air–Water Interface
Authors: Matsumoto Jin , Ijiro Kuniharu , Shimomura Masatsugu 
Published: May 2005

Abstract
An amphiphilic diacetylene with thymine (DA–Thy) was newly synthesized. The amphiphile can form solid-state monolayer and photopolymerize with UV light irradiation at the air–water interface to form blue and red forms of polydiacetylene. Shapes of the crystalline domain of the polydiacetylene monolayer were changed by base pair formation between DA–Thy and adenine nucleobase dissolved in the water subphase.
Effects of Cation Recognition on 1,3-Dipolar Cycloaddition of Crowned Diphenyldiazomethanes with Maleic Anhydride
Authors: Kokubo Ken , Kanematsu Yasuyuki , Oshima Takumi 
Published: May 2005

Abstract
The rates of 1,3-dipolar cycloaddition of 12–21 membered ring crowned diphenyldiazomethanes with maleic anhydride were ion-selectively decelerated by addition of alkali metal perchlorates on account of the diminished FMO interaction associated with the cation recognition.
Photoluminescent Oxygen Sensing Using Tris(acethylacetonato) 1,10-Phenanthroline Terbium(III) Complex Doped on Alumina Film
Authors: Amao Yutaka , Okura Ichiro , Miyashita Tokuji 
Published: May 2005

Abstract
A new photoluminescent oxygen sensor based on the luminescence intensities of tris(acethylacetonato) 1,10-phenanthroline terbium(III) complex (Tb(acac)3phen) doped in alumina film was developed. The luminescence intensity of the Tb(acac)3phen film decreased with increasing the oxygen concentration. Tb(acac)3phen film sensor is calibrated by the modified Stern–Volmer equation.
Effect of Alkali Metal Ion on the Ionic Conductivity of a Novel Liquid Crystal Containing a Dibenzo-18-Crown-6 Unit
Authors: Hirose Takuji , Tanaka Shin-ya , Aoki Yoshio , Nohira Hiroyuki 
Published: May 2005

Abstract
A novel liquid crystal containing a dibenzo-18-crown-6 unit was prepared. The ionic conductivity was increased 1.5 orders of magnitude by the addition of an equimolar amount of K+. However neither Na+ nor Li+ yielded suitable samples corresponding to the ion-size matching of the crown ether unit.
Stereocontrolled Synthesis of a Tetracyclic Sesterterpene, (+)-Scalarenedial
Authors: Soetjipto Hartati , Furuichi Noriyuki , Hata Toshiyuki , Katsumura Shigeo 
Published: May 2005

Abstract
A stereocontrolled, formal synthesis of a tetracyclic sesterterpene, (+)-scalarenedial, was achieved by means of repeating the same ring construction method and a simple resolution of the intermediary tetracyclic β-ketoester with a chiral auxiliary.
Electrodeposition of PbO2 Thin Films at the Interface of Two Immiscible Liquids
Authors: Tada Eiji , Kaneko Hiroyuki 
Published: May 2005

Abstract
PbO2 thin films were electrodeposited by anodic oxidation at the n-decane / lead(II) acetate(aq) interface. SEM observations and X-ray analyses revealed that the film consisted of two layers, one the organic-side layer less than 1 µm thick and the other the aqueous-side thicker layer, which were different in the crystal orientation each other. A film of PbO2 grew along the interface by anodic deposition, similarly to the metallic film by cathodic deposition.
A Novel in situ Ultraviolet Irradiation Polymerization–Photolysis Technique for Fabrication of Polyacrylamide-MS (M = Cd, Pb, Zn) Nanocomposites at Room Temperature
Authors: Zhou Yong , Hao Lingyun , Hu Yuan , Zhu Yurui , Chen Zuyao 
Published: May 2005

Abstract
Polyacrylamide (PAM)-MS (M = Cd, Zn, Pb) inorganic-polymer nanocomposites with homogeneously dispersed semiconductor nanoparticles of narrow size distribution in the polymer matrices were prepared by a novel in situ ultraviolet irradiation polymerization–photolysis (UIPP) technique at room temperature.
Decomposition of Aromatic Compounds by Active Oxygen Generator
Authors: Murakami Takurou N , Takahashi Mitsuo , Kawashima Norimichi 
Published: May 2005

Abstract
An active oxygen generator system using UV irradiation and ozone aeration was developed. The purpose of this study was to decompose benzoic acid using the active oxygen generator. The product of decomposition reaction was measured by UV absorption spectrum, and was analyzed by FT-IR. This active oxygen generator was confirmed to decompose benzoic acid effectively.
High-Pressure Infrared Spectroscopy of Molecular Conformations of Diblock Oligomers α-Decyl-ω-hydroxyoligo(oxyethylene)s in the Solid State
Authors: Fukuhara Koichi , Shoden Maki , Matsuura Hiroatsu 
Published: May 2005

Abstract
Molecular conformations of diblock oligomers H(CH2)10(OCH2CH2)mOH (m = 2, 4, and 6) in the solid state were studied at high pressures (1–2 Gpa) by IR spectroscopy. The oxyethylene chain in the oligomers with m = 2 and 4 assumes the all-trans planar conformation, while that in the oligomer with m = 6 assumes the helical conformation. The stabilized planar structure of the oxyethylene chain at high pressures is explained by increased intermolecular cohesive forces in the alkyl block reinforced by external pressures.
Synthesis and Fluorescence of Copolymer of Triphenylamine and trans-Stilbene from Oxidative-Coupling Reaction
Authors: Zhan Caimao , Cheng Zhangang , Ji Qiaoning , Hu Junli , Zhen Jin , Yang Xi , Qin Jingui 
Published: May 2005

Abstract
A conjugated polymer was prepared by an oxidation-coupling polymerization of triphenylamine (TPA) and trans-stilbene. The structure of the copolymer was characterized by elemental analysis, 1H NMR, UV-vis and FT-IR spectra. The copolymer has good solubility in common organic solvents and high glass transition temperature. Fluorescence spectra showed that the copolymer is violet-blue light emitting material.
Novel Protonation-Induced Structural Conversion of an Ethynylene-Bridged Ferrocene–Anthraquinone Complex
Authors: Murata Masaki , Fujita Takako , Yamada Mami , Kurihara Masato , Nishihara Hiroshi 
Published: May 2005

Abstract
1-Ferrocenylethynylanthraquinone undergoes a structural arrangement into the fulvene-cumulene constitution by the protonation.
Synthesis of Cooligomers of Titanium-Bridged Silsesquioxanes and Octakis(hydridosilsesquioxane)
Authors: Wada Kenji , Yamada Koichi , Izuhara Daisuke , Kondo Teruyuki , Mitsudo Take-aki 
Published: May 2005

Abstract
New titanium-bridged silsesquioxanes having olefinic groups, Ti[(c-C5H9)7Si7O12(SiMe2R)]2 (R = vinyl, allyl), react with octakis(hydridosilsesquioxane) under hydrosilylation reaction conditions to give oligomeric materials. The local structure around the titanium atoms of the starting silsesquioxanes is unchanged even in the oligomeric materials.
Catalytic Behavior of Au Core / Pd Shell Bimetallic Nanoparticles on Silica Prepared by Sonochemical and Sol–Gel Processes
Authors: Okitsu Kenji , Murakami Masatoshi , Tanabe Shuji , Matsumoto Hiroshige 
Published: May 2005

Abstract
A unique catalyst, Au core and Pd shell bimetallic nanoparticles immobilized on porous silica exhibiting a considerable high activity for the hydrogenation of cyclohexene, was prepared via two steps composed of the sonochemical reduction method and the sol–gel process under a low temperature condition.
Mini-Scale Solid-Phase Collection and Concentration of Ultra-Trace Elements in Natural Waters for the Simultaneous Multielement Determination by Air-Flow Injection/ ICP-Mass Spectrometry
Authors: Oshima Mitsuko , Lee Kyue-Hyung , Gao Yunhua , Motomizu Shoji 
Published: May 2005

Abstract
A mini-scale solid-phase collection and concentration method for the multielement determination of ultra-trace rare earth elements (REEs) in natural water samples was developed by using a newly designed small-scale filtration apparatus. A small-size chelating resin disk (iminodiacetate type: IDA; 10 µm pore size; 5 mm diameter; 0.5 mm thickness) was used for high-enrichment preconcentration of REEs and for elimination of alkali and alkaline earth metals in sample solutions. At pH 5.5, REEs in artificial river waters were quantitatively collected on the chelating resin disk, and most of alkali and alkaline earth metals were removed. The REEs on the chelating resin disk were completely recovered by ultrasonication of the disk with 1 cm3 or less of 0.1 mol dm−3 nitric acid. A small amount (25 µL) of the concentrated sample solution was automatically injected and measured by inductively coupled plasma – mass spectrometry (ICP–MS) coupled with an air flow injection (AFI) system.
Fabrication of Hollow Zeolite Fibers through Layer-by-Layer Adsorption Method
Authors: Wang Y J , Tang Y , Wang X D , Yang W L , Gao Z 
Published: May 2005

Abstract
Hollow fibers with nanozeolite walls are firstly fabricated through layer-by-layer (LbL) technique, using carbon fibers as templates, coupled with removal of the templates by calcination. The thickness and the composition of the walls can be readily controlled by varying the number of the deposition cycles and the zeolite types used, respectively.
Dual Effects of the Substrate and Pterins on the Kinetics of CO Binding to Neuronal Nitric Oxide Synthase: A Laser Flash Photolysis Study
Authors: Bengea Simona N , Araki Yasuyuki , Ito Osamu , Igarashi Jotaro , Kurokawa Hirofumi , Shimizu Toru 
Published: May 2005

Abstract
Derivatives of pterin, an important cofactor for neuronal nitric oxide synthase, markedly changed the kinetics of CO binding to the enzyme-bound heme. In the absence of the substrate, l-Arg, CO binding was dependent on the CO concentration for pterin complexes, whereas in the presence of l-Arg, it became CO-independent for most pterin complexes. This suggests dual effects of substrate and pterin binding on the kinetics and access of CO to the ligand channel.
Trimethylsilyl Triflate Mediated New Carbon–Carbon Bond Forming Reactions between Benzyl Diphenylphosphinates and Organosilicon Compounds
Authors: Kobashi Yohei , Minowa Tomofumi , Mukaiyama Teruaki 
Published: May 2005

Abstract
The trimethylsilyl triflate mediated reaction of benzyl diphenylphosphinate with allyltrimethylsilane or trimethylsilyl enolate afforded the corresponding cross-coupling products in good yields.
A Novel Technique to Determine the Rate Constants for the Gas-phase Reactions of Low-volatile Compounds with OH Radical Using a Relative-rate Method in CCl4 Liquid Phase-system
Authors: Kameda Takayuki , Asano Kohei , Inazu Koji , Hisamatsu Yoshiharu , Takenaka Norimichi , Bandow Hiroshi 
Published: May 2005

Abstract
For low-volatile aromatic compounds, a good linear relationship was found between the rate-constant ratio for the liquid-phase reaction with NO3 radical in CCl4 and that for the gas-phase reaction with OH radical when naphthalene was employed as a reference compound. Based on the relationship, the rate constants for the OH radical reaction have been successfully determined for fluoranthene and pyrene, which are important airborne polycyclic aromatic compounds.
A Chemically Modified Green-Fluorescent Protein that Responds to Cleavage of an Engineered Disulphide Bond by Fluorescence Resonance Energy Transfer (FRET)-Based Changes
Authors: Zhang Wei , Suzuki Miho , Ito Yoichiro , Douglas Kenneth T 
Published: May 2005

Abstract
The mixed disulfide of a Green-Fluorescent Protein with an Alexa 532 fluorescent label showed FRET, with quenching of the GFP emission. Reductive cleavage of this disulfide bond destroyed the FRET, giving a change in the ratios of fluorescence intensity at the wavelengths corresponding to the GFP and the Alexa dye. Cleavage by glutathione (second order rate constant at pH 7.4 was 1.18 ± 0.02 × 102 M−1 min−1) was faster than for sodium cyanoborohydride.
Performance Improvement by Inserting an Electrodeposited ZnO into ITO/Organic Solid Interface in Organic Solid-state Solar Cells
Authors: Takahashi Kohshin , Nishi Taiki , Suzaka Syouko , Sigeyama Yasunori , Yamaguchi Takahiro , Nakamura Jun-ichi , Murata Kazuhiko 
Published: May 2005

Abstract
When an electrodeposited ZnO was inserted into the ITO/PV (PV: bisbenzimidazo[2,1-a:2′,1′-a′]antra[2,1,9-def:6,5,10-d′e′f′] diisoquinoline-6,11-dione) interface in ITO/PV/MEH-PPV/Au sandwich-type solar cells (MEH-PPV: poly[2-methoxy-5-(2′-ethylenehexyloxy)-1,4-phenylenvinylene], the cell performance was remarkably improved, resulting in 1.24% of energy conversion yield under the irradiation of AM 1.5–100 mW/cm2.
Continuous Analysis of Volatile Organic Compounds (VOCs) in the Research Practice
Authors: Yamada Etsu , Matsushita Kazumasa , Nakamura Mitsuaki , Fuse Yasuro , Miki Sadao , Morita Hiroyoshi , Shimada Osamu 
Published: May 2005

Abstract
A small, rapid and sensitive instrument for the continuous analysis of volatile organic compounds (VOCs) was developed and applied to the measurement of VOCs in the research practice of university.
Fucosylation of serum glycoproteins in lung cancer patients
Authors: Kossowska Barbara , Ferens-Sieczkowska Mirosława , Gancarz Roman , Passowicz-Muszyńska Ewa , Jankowska Renata 
Published: May 2005

AbstractIncreased expression of sialyl Lewis X or A antigens on metastatic cancer cells leads to their selectin-mediated extravasation. Profound fucosylation of the serum microenvironment may be a factor that interrupts adhesion and influences the formation of metastases. In this study we quantitatively analyzed fucosylation of serum glycoproteins in small-cell and non-small-cell lung cancer patients. Fucosylation of four chosen glycoprotein bands was measured as the reactivity with
Association of cytochrome P450 2E1 genetic polymorphisms with squamous cell carcinoma of the oesophagus
Authors: Li Dongping , Dandara Collet , Parker M. Iqbal 
Published: May 2005

AbstractSquamous cell carcinoma of the oesophagus is one of the most common cancers among black males in South Africa. Genetic polymorphism in the cytochrome P450 2E1 (CYP2E1) gene, coding for one of the main enzymes involved in the bioactivation of tobacco- and alcohol-related substances, was investigated for its role in the development of oesophageal cancer. Three single nucleotide polymorphisms −1053C→T, −1293G→A (both give rise to
The effect of antioxidant supplementation on superoxide dismutase activity, Cu and Zn levels, and total antioxidant status in erythrocytes of patients with Graves' disease
Authors: Bacic-Vrca Vesna , Skreb Franjo , Cepelak Ivana , Mayer Ljiljana , Kusic Zvonko , Petres Blanka 
Published: May 2005

AbstractThe effects of supplementation with a fixed combination of antioxidants (vitamins C and E, β-carotene and selenium) on superoxide dismutase activity, copper and zinc concentrations, and total antioxidant status were monitored in erythrocytes derived from a group of patients with Graves' disease treated with methimazole, with respect to the rate of achieving euthyroidism. Thyroid-stimulating hormone (TSH), thyroid hormones and the above-mentioned parameters were measured before therapy, and on days 30 and 60 after therapy initiation. The patients receiving antioxidant supplementation along with methimazole therapy (group A, n=27) achieved euthyroidism at a faster rate than those treated with methimazole alone (group B, n=28). The activity of superoxide dismutase decreased significantly in both patient groups during the treatment; however, there was no significant difference between the groups. There was no significant change in the erythrocyte concentration of copper, whereas the zinc concentration and total antioxidant status showed significant between-group differences. The study results clearly show that antioxidant supplementation in the treatment of Graves' disease is justified, while zinc and total antioxidant status in erythrocytes seem to be sensitive indicators of the efficacy of supplemental therapy.
Concentrations of calcium, copper, iron, magnesium, potassium, sodium and zinc in adult female hair with different body mass indexes in Taiwan
Authors: Wang Chin-Thin , Chang Wei-Tun , Zeng Weng-Feng , Lin Chang-Hua 
Published: May 2005

AbstractWe investigated concentrations of calcium, copper, iron, magnesium, potassium, sodium and zinc using atomic absorption spectroscopy in the hair of four groups of adult females (n=392), ranging in age from 20 to 50years, with different body mass index (BMI): BMI<18, slim group; BMI 18–25, normal group; BMI 26–35, overweight or obese group; and BMI>35, morbidly obese group. We found that the group with BMI<18 had the highest ratios for [Ca]/[Mg], [Fe]/[Cu] and [Zn]/[Cu], but the lowest ratio for [K]/[Na] in hair. On the contrary, the group with BMI>35 had the highest ratio for [K]/[Na], but the lowest for [Fe]/[Cu] and [Zn]/[Cu] in hair. Furthermore, when we compared concentrations of Ca, Cu, Fe, Mg, K, Na and Zn between the groups with BMI<18 and BMI>35, we found that there were significant differences (p<0.05) in zinc concentrations between these two groups. In addition, there were significant differences in Ca, Cu, Mg, K and Na concentrations, with p<0.01 at least. From this point of view, we suggest that hair concentrations of Ca, Cu, Fe, Mg, K, Na and Zn may be correlated with adult female BMI, but further studies are needed.
How accurate are clinical activity indices for scoring of disease activity in inflammatory bowel disease (IBD)?
Authors: Jørgensen Lone G. M. , Fredholm Lisbeth , Hyltoft Petersen Per , Hey Henrik , Munkholm Pia , Brandslund Ivan 
Published: May 2005

AbstractClinical activity indices are essential instruments in monitoring inflammatory bowel diseases such as Crohn's disease (CD) and ulcerative colitis (UC). To subclassify components of disease indices in CD and UC, investigate technical noise in estimation of the indices, establish a signal-to-noise ratio (SNR), evaluate correlation between indices and calculate the reference change value (RCV) for selected biochemical variables in individual cases, 50 patients with CD and 49 patients with UC were included in the study. Qualitative index variables were assessed for scoring errors. The standard deviation (SD) was estimated according to a rectangular model, while SD in biochemical variable scoring was estimated according to a Gaussian model; a combined SD was also calculated. These values were investigated for their individual contribution to variation. The 95% CI of an index value was based on ±1.96×SD
An iterative method for improved estimation of the mean of peer-group distributions in proficiency testing
Authors: Ichihara Kiyoshi , Kawai Tadashi 
Published: May 2005

AbstractIn proficiency testing (PT), the peer-group mean is conventionally computed after twice removing values exceeding the mean±3 SD. However, this adjustment fails if there are many outliers. In this study an iterative method was evaluated as a more robust way to estimate the means. The methodology repeatedly removes a proportion of the population (usually those exceeding the mean±1.6 SD), assuming the presence of a Gaussian distribution in the central portion, and reinflates the SD to compensate for the trimming. A computer simulation revealed that the estimated mean of a known Gaussian distribution was less affected by a subpopulation that overlaps the main population than was the conventional method. When the overlapping portions were removed, the iterative method predicted the true mean correctly. The method was applied to external PT results for 44 analytes. Although most peer-group distributions were clearly non-Gaussian, the segment included by the predicted mean±1.6 SD was regarded as Gaussian in 85.9% by the new method and 73.4% by the conventional method. The proposed methodology appears to be an improved way of estimating peer-group means.
Impact of a common CV evaluation scheme on overall laboratory performance: 8-year experience of a large national proficiency testing program in Japan
Authors: Ichihara Kiyoshi , Kawai Tadashi 
Published: May 2005

AbstractIn proficiency testing (PT), it is difficult to set rational criteria for determining target values and allowable limits. In Japan, the largest national PT program has for the past 8years used an evaluation scheme based on a “common coefficient of variation” (cCV) to overcome this difficulty. The cCV, the average within-method variation, is derived by one-way analysis of variance from data of peer groups after excluding those with large variations. A unit interval used for grading participants is obtained by multiplying the cCV by the peer-group mean which is computed using an iterative method featuring repeated removal of a large portion of the tails of the distribution and reinflation of the standard deviation (SD) to compensate for the trimming. The evaluation scheme gives a relatively better grade to those participants in peer groups with small CVs, compared to use of individual peer-group CVs. The scheme has expedited the transition to more reproducible methods, resulting in a notable overall improvement in laboratory performance. The cCV evaluation scheme is uniformly applicable to any analyte measured quantitatively. The iterative method, an integral part of the scheme, effectively precludes bias in the evaluation.
Significance of small dense low-density lipoproteins as coronary risk factor in diabetic and non-diabetic Korean populations
Authors: Yoon Yeomin , Song Junghan , Park Hyung Doo , Park Kyoung-Un , Kim Jin Q. 
Published: May 2005

AbstractSmall dense low-density lipoproteins (LDLs) have been associated with coronary heart disease (CHD) and type 2 diabetes in previous studies. However, the significance of small dense LDLs as a coronary risk factor for subjects with type 2 diabetes remains unclear. We measured mean LDL particle diameter by gradient gel electrophoresis (Quantimetrix Lipoprint™ LDL System) in 44 type 2 diabetes patients, 100 CHD patients, 35 CHD patients with type 2 diabetes and 88 age-matched control subjects. Mean LDL particle sizes were significantly smaller (p<0.05, Mann-Whitney test) in diabetes mellitus-only patients (25.7±0.8nm), CHD-only patients (25.2±1.4nm), and CHD patients with diabetes mellitus (24.9±1.6nm) than in controls (26.2±1.4nm). As for the mean LDL particle size, the prevalence of small dense LDLs (mean diameter ≤25.5nm) was higher (p<0.05, χ