bluuebunny/crossref_metadata_2025_split huggingface dataset:
Time-Resolved Infrared Emission Studies of CO2 Formed by Catalytic Oxidation of CO on Pt and Pd Surfaces
Authors: Kunimori Kimio , Haller Gary L 
Published: July 2006

Abstract
Time-resolved FTIR emission spectroscopy was used to detect vibrationally excited gas phase CO2 formed by the catalytic oxidation of CO on Pt and Pd surfaces. A continuous molecular beam of O2 and a pulsed flux of CO (200 μs FWHM) were supplied to the surface at 900 K, and the infrared emission of the CO2 product was analyzed with 30 μs time resolution to study the dependence of the internal energy on surface oxygen coverage. Analysis of the band width and centroid of the time-resolved infrared spectra (4 cm−1 resolution) allows an estimation of the rotational and average vibrational temperatures (TR and TV ) of the CO2 molecules. At a low CO nozzle pressure on a Pt surface, the infrared signal intensity almost parallels the time dependent CO flux to the surface with relatively small changes in the infrared spectra. The analysis showed that both TV and TR decrease with decreasing surface oxygen coverage and that the change in TR is more significant than that in TV. At a high CO nozzle pressure, the reaction can be shut off as the oxygen on the Pt surface is depleted (CO titration behavior). These infrared spectra showed large changes in TV (from ca. 1700 K to 700 K). In contrast, on a Pd surface no drastic change in TV was observed even at high CO pressure, but TV was decreased slightly with decreasing surface oxygen coverage. The TV values (around 2000 K) on Pd are much higher than on Pt.
A New Annulation Reagent, 2-Oxo-3-alkenylphosphonates. Reactions with Carbonyl-Stabilized Carbanions or Silyl Enol Ethers Leading to Cyclohexenones
Authors: Wada Eiji , Funakoshi Junji , Kanemasa Shuji 
Published: July 2006

Abstract
The reactions of 2-oxo-3-alkenylphosphonates with carbonyl-stabilized carbanions directly lead to 2-cyclohexen-1-ones through a sequence of Michael reaction and intramolecular Horner–Emmons olefination. On the other hand, the Lewis acid-mediated reactions with silyl enol ethers produce 1,5-diketones as Michael adducts, which then undergo cyclization on treatment with sodium hydride or triethylamine/zinc (II) bromide to afford 2-cyclohexen-1-ones or 2-phosphinyl-2-cyclohexen-1-ones, respectively.
Thermal Transformation of a Layered Double Hydroxide Pillared with Decavanadate Isopolyanions
Authors: Lopez Salinas Esteban , Ono Yoshio 
Published: July 2006

Abstract
V10O286− anions, intercalated by anion-exchange into the interlayer gallery of a Mg–Al layered double hydroxide, undergo chemical transformation and reduction in the valence state when subjected to thermal treatment. XRD and IR analyses indicate that V10O286− breaks up into smaller species at 473 K, which then rearrange to form polymeric vanadate species of the type [–VO3–]nn− at 573–623 K. Concomitant with the disarrangement of the decavanadate anion, reduction of V(V) to V(IV) species takes place even when heat treated under air, as evidenced by ESR analysis. The number of V(IV) species increased steadily from 2.4 × 1018 to 2.2 × 1019 spin g−1 when the temperature of heat treatment rose from 393 to 473 K. Higher temperatures decreased gradually the number of V(IV).
Synthesis and Chemiluminescence Properties of 6-(4-Methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-3(7H)-one and 2-Methyl-6-(2-naphthyl)imidazo[1,2-a]pyrazin-3(7H)-one
Authors: Toya Yoshiaki , Kayano Toshimasa , Sato Kyoko , Goto Toshio 
Published: July 2006

Abstract
New Cypridina luciferin analogues, 6-(4-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-3(7H)-one (MCLA) and 2-methyl-6-(2-naphthyl)imidazo[1,2-a]pyrazin-3(7H)-one (NCLA), were prepared together with their oxyluciferin analogues, 2-acetamido-5-(4-methoxyphenyl)pyrazine (MCOLA) and 2-acetamido-5-(2-naphthyl)pyrazine (NCOLA). Various chemiluminescence properties of these compounds were compared with those of known luciferin analogues, 2-methyl-6-phenylimidazo[1,2-a]pyrazin-3(7H)-one (CLA) and 6-(3-indolyl)-2-methylimidazo[1,2-a]pyrazin-3(7H)-one (ICLA). The light yields obtained from ICLA, MCLA, and NCLA were much higher than CLA in diethylene glycol dimethyl ether (diglyme), in which triplet oxygen was the oxidant. In aqueous solution, employing superoxide ion as the oxidant, NCLA emitted light weaker than CLA and MCLA. ICLA gave almost no light on account of no fluorescence intensity of the emitter (oxyluciferin analogue ICOLA) in aqueous solution. For applications to the detection of active oxygen species produced during enzymatic reactions, MCLA is superior to conventionally used CLA because of its higher chemiluminescence quantum yield and its emission maximum in visible region.
The Reactions of Nitrile Oxide–Quinone Cycloadducts. I. Base-Induced Rearrangement of the 1 : 1 –C=C– Adducts of Aromatic Nitrile Oxides with Dialkyl-Substituted p-Benzoquinones
Authors: Shiraishi Shinsaku , Holla B Shivarama , Imamura Kiyoshi , Inoue Yukihiko 
Published: July 2006

Abstract
The 1,3-dipolar cycloadducts, 9-aryl-7-oxa-8-azabicyclo[4.3.0]nona-3,8-diene-2,5-diones, which were obtained from the reactions of aromatic nitrile oxides with dialkyl-substituted p-benzoquinones, underwent an interesting rearrangement on the action of bases. The reactions exhibited incomprehensible substituent effect. The structure elucidation of the rearranged products and the reaction mechanism are described and discussed.
The Reactions of Nitrile Oxide-Quinone Cycloadducts. II. The Reactions of 2,5-Di-t-butyl-p-benzoquinone with Nitrile Oxides: 1 : 2 Cycloaddition and Base Induced Ring Transformation of the Cycloadducts
Authors: Inoue Yukihiko , Ambekar Salvottam Y , Xu Xiao-Hong , Shiraishi Shinsaku 
Published: July 2006

Abstract
The reactions of 2,5-di-t-butyl-p-benzoquinone with p-substituted benzonitrile N-oxides successfully gave 1 : 2 cycloadduct. The cycloadducts were proved to undergo base induced reactions in different patterns with aqueous sodium hydroxide or with triethylamine. Sodium hydroxide caused cleavage of cyclohexanedione ring to give γ-keto carboxylic acid derivatives, which take γ-hydroxy lactone form in solid state. On the other hand, triethylamine caused isoxazoline ring transformation reaction with elimination of one t-butyl group to give bis(isoxazole)-fused hydroxycyclohexadienone derivatives. The structure determination and the reaction mechanism are discussed.
Preparation and Properties of Clays Pillared with SiO2–TiO2 Sol Particles
Authors: Yamanaka Shoji , Inoue Yasushi , Hattori Makoto , Okumura Fumio , Yoshikawa Mikio 
Published: July 2006

Abstract
The silicate layers of montmorillonite clay were pillared with SiO2–TiO2 sol particles. Although only the SiO2 sols were negatively charged, the SiO2–TiO2 mixed oxide sols were positively charged and could be ion-exchanged with the interlayer cations of montmorillonite. The resulting pillared clays had a basal spacing expanded to more than 40 Å; the spacing was maintained during calcination up to 773 K. The adsorption properties of the calcined samples were studied for nitrogen as well as organic vapors. A structural model for the arrangement of the intercalated sol particles is proposed in which small SiO2–TiO2 sol particles are packed between the silicate layers. Micropores with a slit width of 10–12 Å are formed in the interstices between the sol particles and the silicate layers.
Selective Hydrogenation of Carbon Dioxide to Methanol on Cu–ZnO/SiO2 Catalysts Prepared by Alkoxide Method
Authors: Okabe Kiyomi , Sayama Kazuhiro , Matsubayashi Nobuyuki , Shimomura Kin’ya , Arakawa Hironori 
Published: July 2006

Abstract
Hydrogenation of CO2 to methanol was carried out on Cu–ZnO/SiO2 catalysts at 493 K and 3 MPa with a flow rate of 100 cm3 min−1 (H2/CO2 = 2). Higher selectivity ( &gt; 90%) was observed on the catalysts prepared by the alkoxide method than on a conventional catalyst prepared by the impregnation method. The selectivity was higher on the catalysts pretreated with H2 at a higher temperature, except at 873 K. The activity of the catalyst pretreated at 873 K was extremely low, probably because of alloy formation. The results of XRD, XPS, and EXAFS demonstrate that the active species for methanol formation is a large metallic Cu particle covered with a partially oxidized layer interacting with highly dispersed ZnO.
Crystal Structure of (ImH)[Ni(dmit)2]2 with Intercolumnar Interaction through an Imidazolium Counter Ion
Authors: Miyazaki Akira , Izuoka Akira , Sugawara Tadashi 
Published: July 2006

Abstract
In the crystal of semiconductive salt, (ImH)[Ni(dmit)2]2 (ImH = imidazolium, H2dmit = 4,5-dimercapto-1,3-dithiol-2-thione), Ni(dmit)2 molecules are dimerized and stacked in columns, with two types of intercolumnar interaction through an imidazolium counter cation. One is based on three-centered S···NH···S type hydrogen bonds, and the other is van der Waals contacts between imidazolium cation and dmit ligand.
Polymers Having pH-Buffering Capability for Potential Use as Solid-Phase Reagent
Authors: Nakano Koji , Moriguchi Isamu , Ohishi Syunya , Takagi Makoto 
Published: July 2006

Abstract
Macroreticular styrene–divinylbenzene copolymeric resins were functionalized with aliphatic amine moieties and carboxylato groups. Their acid dissociation properties were studied with potentiometric method. Due to the acid-base properties of the incorporated functional groups, the resins obtained showed pH-buffering abilities covering the range of pH 4–9 to be useful as solid-phase reagents.
Solvent Extraction and Association of Nitrophenols with Trioctylphosphine Oxide in Cyclohexane
Authors: Kusakabe Satoshi , Ogihara Yasushi , Sekine Tatsuya 
Published: July 2006

Abstract
Extraction of phenol and nitrophenols into cyclohexane and association of these phenols with trioctylphosphine oxide (TOPO) in the organic phase were investigated at 298 K. A linear relation was found between the logarithm of the partition coefficient of the phenols and the logarithm of their association constant with TOPO.
Extractive Separation of Trace Amounts of CuII, FeIII, and GaIII from AIII on the Basis of HSAB Rule
Authors: Kawamoto Hiroshi , Nishimura Tohru , Tsunoda Kin-ichi , Akaiwa Hideo 
Published: July 2006

Abstract
The design of a separation scheme for CuII, FeIII, and GaIII from AIII by chelate extraction was proposed on the basis of the HSAB rule. Among the various chelating agents, 8-quinolinol was estimated to be the most effective for separation. This prediction was confirmed through experiments.
Phase Separation of Phosphotellurite Glass Investigated by 57Fe-Mössbauer Spectroscopy and DTA
Authors: Nishida Tetsuaki , Yamada Miho , Takashima Yoshimasa 
Published: July 2006

Abstract
The isomer shifts (δ) of xP2O5·(95−x)TeO2·5Fe2O3 glasses (x = 0–28), 0.38–0.39 mm s−1, suggest that Fe3+ substitutes for Te4+ of TeO4 trigonal bipyramids. The δ’s of 0.42–0.43 mm s−1 obtained when 30 ≤ x ≤ 40 indicate that Fe3+ (Oh) is present at interstitial sites of PO4 tetrahedra in the phosphate-rich phase.
Prediction of pKa Vlaues of Alkylphosphonic Acids
Authors: Ohta Kyuji 
Published: July 2006

Abstract
The pKa values of unsubstituted and substituted alkylphosphonic acids in aqueous solution were found to have a good linear correlation with the electron densities of the phosphorus atom of the corresponding phosphonic acids, which are calculated using the PM3 method. This enabled us to predict the pKa values of this class of compounds.
Substituent Effects on the 13C and 15N NMR Spectra of p-Substituted Phenylacetonitriles
Authors: Kusuyama Yoshiaki 
Published: July 2006

Abstract
13C and 15N NMR spectra have been measured for fifteen p-substituted phenylacetonitriles. The substituent-induced chemical shift changes (SCS) of C-1 had an inverse trend, while SCS (15N) showed a normal trend. These SCS values were correlated by the normal substituent constant, σ0. The observation are consistent with a pi-polarization mechanism in which the C≡N bond is polarized by the p-substituted phenyl moiety.
Synthesis of Syzygiol; A Skin-Tumor Promotion Inhibitor
Authors: Sato Shingo , Obara Heitaro , Endo Akira , Onodera Jun-ichi , Matsuba Shigeru 
Published: July 2006

Abstract
Syzygiol, 3-hydroxy-2-(β-hydroxycinnamoyl)-5-methoxy-6,6-dimethyl-2,4-cyclohexadien-1-one (1) was synthesized via ceroptene (5).
The Base-Catalyzed H/D-Exchange of Anisole Moiety of Ruthenium Complex in Cooperation with Demethylation by Hydroxide Anion in Methanol-d4
Authors: Kimura Masaru , Morita Mitsunobu , Mitani Hideo , Okamoto Hideki , Satake Kyosuke , Morosawa Shiro 
Published: July 2006

Abstract
[Ru(η5-C5H5)(η6-arene A)]BF4 (arene A = nitrobenzene, m- or p-nitrotoluene, anisole, phenetole, m- or p-methylanisole) were quantitatively converted to pure [Ru(η5-C5H5)(η6-arene B)]BF4 (arene B = phenoxido-2d m- or p-monodeuterated methylphenoxido) in the presence of excess KOH in CD3OD, whereas [Ru(η5-C5H5)(η6-anisole)] BF4 was quantitatively obtained by treatment [Ru(η5-C5H5)(η6-nitrobenzene)] BF4 with 1 equivalent KOH or CH3OK.
A Convenient Synthesis of Cationic Vinylidene and 1,2-Propadienylidene Iron Complexes by Photoreaction of [CpFe(CO)(dppe)]+BF4− with 1-Alkynes
Authors: Nakanishi Saburo , Goda Ken-ichi , Uchiyama Shin-ichi , Otsuji Yoshio 
Published: July 2006

Abstract
Photoreaction of [CpFe(CO)(dppe)]+BF4− with 1-alkynes proceeded to give cationic vinylidene and 1,2-propadienylidene iron complexes in good yields.
Partial Oxidation of Methane to Synthesis Gas over Rhodium Vanadate, RhVO4: Redispersion of Rh Metal during the Reaction
Authors: Kunimori Kimio , Umeda Shinichi , Nakamura Junji , Uchijima Toshio 
Published: July 2006

Abstract
Partial oxidation of methane to synthesis gas (CO+H2) has been carried out over both RhVO4/SiO2 and unpromoted Rh/SiO2 catalysts at temperatures between 300 °C and 720 °C and 1 atomosphere pressure, with a CH4 : O2 of 2 : 1 under nitrogen dilution. It is found that the RhVO4 compound supported on SiO2 was reduced to Rh metal and V2O3 during the reaction, and the catalyst showed onset of activity to CO and H2 around 500 °C reaching a maxium conversion in excess of 90% at 650 °C, while the unpromoted Rh/SiO2 catalyst showed the onset of activity at the higher temperature (above 600 °C) reaching almost 100% conversion at around 700 °C. The different catalytic activity may be ascribed to both the morphology change (Rh dispersion) and the Rh–vanadia interaction after the reduction of the RhVO4 compound.
Topochemical Reaction of 7-Bromoethoxycarbonyl-7-cyano-1,4-benzoquinone Methide in the Solid State
Authors: Itoh Takahito , Tachino Kyoko , Uno Takahiro , Kubo Masataka , Tohnai Norimitsu , Miyata Mikiji 
Published: July 2006

Abstract
Topochemically controlled [2 + 2] photocycloaddition took place at the quinoid double bond of the 7-bromoethoxycarbonyl-7-cyano-1,4-benzoquinone methide (1) to afford its cyclobutane dimer.
Construction of Strained Frameworks with 1,8-Anthrylene Units and Acetylene Linkers: Synthesis and Structures of Cyclic Trimers
Authors: Goichi Michio , Miyahara Hiroaki , Toyota Shinji 
Published: July 2006

Abstract
Two 1,8-anthrylene cyclic trimers with acetylene or diacetylene linkers were synthesized by macrocyclization with the Eglinton coupling. These compounds have nonplanar and strained cyclic structures with significant bending deformations of acetylene carbons as revealed by X-ray analysis and DFT calculation. The effects of the molecular structures on the 13C NMR chemical shifts and the electronic spectra are discussed.
A New Spectrophotometric Method for Determination of Urinary Protein Using Erythrosin B
Authors: Isoe Junichi , Kaneko Emiko 
Published: July 2006

Abstract
A new sensitive spectrophotometric method for human serum albumin (HSA), the main protein in urine, has been developed using Erythrosin B. The proposed method is not based on conventional spectral shift but on an enhanced absorbance of the protein–bound dye and suppression of reagent blank in the presence of Triton X-100. The detection limit for HSA is 0.06 mg L−1 (S/N = 3), which is superior to conventional methods by a factor of 50–100. This is the first ever spectrophotometric method applicable for urinary protein even in healthy subjects.
Population of 6-Enol Form is Higher in 8-Oxoguanine than in Guanine
Authors: Yoshida Tomoki , Aida Misako 
Published: July 2006

Abstract
We investigate the relative stabilities of tautomers of 8-oxoguanine (8OG) and guanine (G) comprehensively at various levels of theory up to MP4 and CCSD(T) in the gas phase. We find that the population of the enol form at C6 position in 8OG is higher than that in G at any level of theory which we used. This may partly account for the high mutagenicity of 8OG.
Exciplex Formation between Pyrene and N,N-Dimethylaniline in DNA for the Detection of One-base Deletion
Authors: Kashida Hiromu , Komiyama Makoto , Asanuma Hiroyuki 
Published: July 2006

Abstract
Exciplex emission from pyrene and N,N-dimethylaniline moieties was observed in aqueous solution by incorporating them into DNA. By using this exciplex formation, one-base deletion was successfully detected.
Observation of the New κ2C,O:κ2C′,O′ Coordination Mode of 1,1,2,2-Tetraacetylethanato Ligand in a Dinuclear 1,1,1,5,5,5-Hexafluoroacetylacetonato Palladium(II) Complex
Authors: Fukuda Yutaka , Sakumoto Maiko , Tanabe Yoshiaki , Ishii Youichi , Suzuki Wakako , Nakao Akiko 
Published: July 2006

Abstract
We have isolated a new dinuclear palladium(II) complex containing 1,1,2,2-tetraacetylethanato (taet) and 1,1,1,5,5,5-hexafluoroacetylacetonato (hfac) ligands, [(hfac)Pd(C,O-taet)Pd(hfac)] (2b), whose crystallographic study has revealed that taet is coordinated to each palladium center as a κ2C,O ligand to form a five-membered chelate ring. Complex 2b provides the first example of the κ2C,O:κ2C′,O′ coordination mode of β-diketonato ligand, which slowly tautomerizes to [(hfac)Pd(O,O-taet)Pd(hfac)] (2a).
Thin Film Characteristics and FET Performances of β-Octyl-substituted Long Oligothiophenes
Authors: Takimiya Kazuo , Sakamoto Katsuhiro , Otsubo Tetsuo , Kunugi Yoshihito 
Published: July 2006

Abstract
A series of β-octyl-substituted oligothiophenes from 6-mer to 41-mer was examined for active layers of organic filed-effect transistors. Upon spin-coating from chloroform solution, the 20-mer and the longer oligomers formed homogenous thin films composed of stacked lamella structures. Top-contact devices fabricated using these films showed good p-channel FET characteristics with mobilities of 10−3 cm2 V−1 s−1 which gradually increase with the extension of chain length.
Online Posture Correction for Humanoid Walking Robots (Online Haltungskorrektur für humanoide Laufroboter)
Authors: Wollherr Dirk 
Published: July 2006

Summary
An online posture modification method termed Jacobi Compensation is proposed which is suitable to modify precalculated step trajectories for a humanoid robot in certain task coordinate directions. This method can account for modeling errors in trajectory precalculation by shifting e. g. the center of mass or certain parts of the humanoid mechanism to increase walking equilibrium and performance. A theoretical analysis of stability properties is given.
Descriptor Systems: A General Mathematical Framework for Modelling, Simulation and Control (Deskriptorsysteme: Ein allgemeines mathematisches Konzept für Modellierung, Simulation und Regelung)
Authors: Mehrmann Volker , Stykel Tatjana 
Published: July 2006

Summary
Descriptor systems present a general mathematical framework for the modelling, simulation and control of complex dynamical systems arising in many areas of mechanical, electrical and chemical engineering. This paper presents a survey of the current theory of descriptor systems, concerning solvability, stability, model reduction, controllability, observability and optimal control.
Feeding Ecology of Juvenile Lake Sturgeon in the St. Lawrence River System
Authors: Nilo Pedro , Tremblay Serge , Bolon Aline , Dodson Julian , Dumont Pierre , Fortin Réjean 
Published: July 2006

AbstractWe examined the diet of juvenile lake sturgeonAcipenser fulvescensat five sites in the St. Lawrence River, including two sites in major tributaries (Des Prairies and L'Assomption rivers), two main‐stem sites located upstream (Verchères and Sorel‐Berthier islands), and one site located downstream in the estuarine transition zone (ETZ). The benthic fauna was sampled at all sites except in the ETZ. The diets of juvenile lake sturgeon were highly diverse. Of the 74 invertebrate prey taxa identified, approximately 50 occurred in more than 5% of the stomach contents. Most of these prey taxa were of small size. In the three sites where the same sampling strategy and techniques were used, diet varied significantly with sampling site and month. In addition, diet varied significantly with fish length but independently of site and month. Lake sturgeon from the Verchères Islands exhibited the highest diet diversity, and fish situated in the ETZ exhibited the lowest. Except for one of the five sites (L'Assomption River), diet was dominated by amphipods. Chironomids predominated at L'Assomption River and were the second most numerous at the Verchères Islands, Sorel‐Berthier Islands, and Montmagny sites. Other important prey were oligochaetes, ephemeropteran nymphs, trichopteran larvae, mollusks, and fish eggs. The benthos composition differed among sites. Positive values for Ivlev's electivity index were found for malacostracans and ephemeropteran nymphs at all four upstream sites and for dipteran larvae at one upstream site; mollusks were generally negatively selected at one upstream site. At the three sites where the same sampling strategy was used, food preference differed as a function of site and month. Within some site × month combinations, preference also varied with fish length. Our results (1) confirm that juvenile lake sturgeon are generalists and opportunistic benthic feeders, (2) reveal that diet composition is only partly determined by benthos availability, and (3) suggest that there is positive selection for drifting prey. Within the study area, lake sturgeon aggregate locally, but the presence of juveniles in these specific areas cannot be fully explained by their food habits.
Lévy-statistics for partially equilibrated systems
Authors: Petridis Athanasios 
Published: July 2006

Abstract
We examine deviations from Boltzmann-Gibbs statistics for a certain class of partially equilibrated systems of finite size. We find that such systems are characterized by the Lévy distribution whose non-extensivity parameter is related to the number of internally equilibrated subsystems and to correlations among them. This concept is applicable to relativistic heavy ion collisions.