bluuebunny/crossref_metadata_2025_split huggingface dataset:
Redox Behavior of Active Aldehydes Derived from Thiamin Coenzyme Analogs
Authors: Nakanishi Ikuo , Itoh Shinobu , Suenobu Tomoyoshi , Inoue Hiroo , Fukuzumi Shunichi 
Published: July 2004

Abstract
Redox behavior of active aldehydes of thiamin coenzyme models has been investigated using 3-benzylthiazolium salts and o-tolualdehyde in the presence of a base. The use of a sterically hindered aldehyde has precluded benzoin condensation of the active aldehydes, leading to the formation of relatively stable active aldehydes. The redox potentials of the active aldehydes have been determined by cyclic voltammetry for the first time, and they are sufficiently negative to reduce C60 to the corresponding dianion (C602−).
Syntheses and Characterization of Photochromic Dendrimers Including a 1,3-Alternate Calix[4]arene as a Core and Azobenzene Moieties as Branches
Authors: Nagasaki Takeshi , Tamagaki Seizo , Ogino Kenji 
Published: July 2004

Abstract
The first photochromic dendrimers which involve a 1,3-alternate conformer of a calix[4]arene as a core and azobenzene skeletons as branches have been synthesized and characterized. Photochemical properties of the photochromic dendrimers are described.
Effects of the Gel Size on the Thermal Behavior of N-isopropylacrylamide Gels in Relation to the Volume Phase Transition
Authors: Kawasaki Hideya , Sasaki Shigeo , Maeda Hiroshi 
Published: July 2004

Abstract
Effects of the gel size on the thermal behavior and the shrinking profile of poly(N-isopropylacrylamide)(NIPA)gel in water were investigated by differential scanning calorimetry(DSC) and the volume measurement at the same heating rate. The DSC thermogram of NIPA gel of the smallest size gave double endothermic peaks and the gel underwent a discontinuous volume phase transition during DSC run. On the other hand, a single endothermic peak was observed for NIPA gel of the largest size and the gel shrank only slightly during DSC run due to the slow volume change.
Charge-Transfer Complex of a New Acceptor Cyananilate with Tetramethyltetrathiafulvalene, (TMTTF)2HCNAL
Authors: Zaman Md Badruz , Morita Yasushi , Toyoda Jiro , Yamochi Hideki , Saito Gunzi , Yoneyama Naoki , Enoki Toshiaki , Nakasuji Kazuhiro 
Published: July 2004

Abstract
Cyananilic acid (H2CNAL) gave a charge-transfer complex with tetramethyltetrathiafulvalene, (TMTTF)2HCNAL, in which the acceptor forms a hydrogen-bonded ribbon arrangement and the donor forms a columnar stacking. The ionicity of the donor is estimated as +0.5. The electrical conductivity is 0.03 Scm−1 with the activation energy of 0.05 eV. The magnetic spin susceptibility is described in terms of a one-dimensional antiferromagnet.
Intramolecular Cyclization Reaction via a Sterically Protected Episelenonium Ion Intermediate
Authors: Toshimitsu Akio , Terada Masayoshi , Tamao Kohei 
Published: July 2004

Abstract
Steric protection of the selenium atom in the episelenonium ion intermediate by the bulky 2,4,6-tri-tert-butylphenyl (TTBP) group has been utilized in the selective formation of carbocyclic compounds from the substrate bearing a β-oxyselenide unit and a double bond in the same molecule.
Partitioning of Cations and Anions of Electrolytes in Electrostatic Ion Chromatography Using Pure Water as Mobile Phase
Authors: Umemura Tomonari , Kamiya Shinji , Kitaguchi Ryuji , Haraguchi Hiroki 
Published: July 2004

Abstract
The elution behaviors of the mixture solution of strong electrolytes in electrostatic ion chromatography, using pure water as a mobile phase, have been investigated with a conductivity detector and ICP-AES, where a zwitterionic surfactant adsorbed on an ODS column was used as a stationary phase. The characteristic re-combinations of cations and anions as the ion-pairs were observed in the chromatograms.
Coverage Dependent Structure of Electrochemically Deposited Cu on p-GaAs(100) in H2SO4 Solution Determined by In Situ Surface X-Ray Absorption Fine Structure Spectra
Authors: Kondo Toshihiro , Tamura Kazuhisa , Koinuma Michio , Oyanagi Hiroyuki , Uosaki Kohei 
Published: July 2004

Abstract
In situ surface X-ray absorption fine structure technique was applied to study the structures of electrochemically deposited Cu on a p-GaAs(100) electrode with various coverage. Extended X-ray absorption fine structure (EXAFS) spectra of Cu were obtained with high S/N ratio even from submonolayer deposit. EXAFS data showed that the Cu clusters were formed on the p-GaAs(100) electrode as the deposition exceeded more than one monolayer. The structure of the submonolayer deposit was different from that of the bulk deposit. The neighboring atoms in the latter are only Cu of the fcc structure but those in the former are O and Cu of shorter bond length.
Facile Synthesis of β-Hydroxy-γ-Varelolactone via the Ring Opening Reaction of β-Trichloromethyl-β-Propiolactone with Ester Enolates
Authors: Shimizu Makoto , Ishii Koichi , Fujisawa Tamotsu 
Published: July 2004

Abstract
The reaction of enantiomerically pure (S)-β-trichloromethyl-β-propiolactone with enolate derived from t-butyl acetate gave δ-hydroxy-β-ketoester in good yield. Subsequent syn-selective reduction of ketone and cyclization gave β-hydroxy-γ-varelolactones in good yield in enantiomerically pure form. The β-hydroxy-γ-varelolactones thus obtained are excellent precursors for the synthesis of compactin and mevinolin derivatives of potent inhibitor of hydroxymethylglutaryl coenzyme A reductase (HMG CoA reductase).
Syntheses and Characterization of Chloro(Me2SO)ruthenium(II) Complexes with Tris(2-pyridylmethyl)amine or N,N-Bis(2-pyridylmethyl)glycinate and Their Application for Catalytic Hydroxylation of Alkane
Authors: Yamaguchi Motowo , Kousaka Hiroyuki , Yamagishi Takamichi 
Published: July 2004

Abstract
The new ruthenium(II) complexes, [RuCl(Me2SO)(TPA)]X (X = Cl or PF6) and [Ru(BPG)Cl(Me2SO)] were prepared, and the catalytic activity for alkane hydroxylation using m-chloroperbenzoic acid was examined.2 Two geometrical isomers of the TPA complexes were isolated and showed marked difference in activity: the trans(Cl, Namino) isomer is the most active and selective catalyst toward the oxygenation of adamantane giving 1-adamantanol (75%) and 2-adamantanol (5%).
Bending Deformation of Monolayer Polyurethane Film Induced by an Electric Field
Authors: Watanabe Masashi , Yokoyama Mikito , Ueda Tsutomu , Kasazaki Toshiaki , Hirai Mitsuhiro , Hirai Toshihiro 
Published: July 2004

Abstract
The bending deformation of a polyurethane film induced by an applied electric field was examined under free electrode conditions. We showed that the deformation was due to bending electrostriction.
Determination of the Optical Purity for Serine and Threonine by Gas Chromatography on a Chiral Column
Authors: Fransson Bengt , Ragnarsson Ulf 
Published: July 2004

Abstract
In a two-step procedure, serine and threonine were converted first to N-isobutoxycarbonyl-amino acid 2,2,2-trifluoroethyl esters and subsequently also to novel N,O-bis-isobutoxycarbonyl-derivatives. As such all four isomers of threonine could easily be resolved on a commercial chiral (Chirasil-d-Val) gas chromatography column at 140 °C. A significant influence of the configuration at the β-position on the retention time was thereby observed. Similarly, improved separation was demonstrated for the two enantiomers of N,O-bis-isobutoxycarbonyl-serine isobutylamide.
New Vistas in Dehydrocoupling Polymerization of Hydrosilanes: Platinum Complex-Catalyzed Dehydrocoupling of Cyclic and Acyclic Secondary Silanes
Authors: Chauhan Bhanu P S , Shimizu Toshimi , Tanaka Masato 
Published: July 2004

Abstract
Pt(cod)2 catalyzed dehydrocoupling of acyclic and cyclic secondary silanes R1R2SiH2[R1, R2 = alkyl group; R1 + R2 = (CH2)n(n = 3,4,5); R1 + R2 = o-biphenylene] to afford polysilanes while a (CH3)2Pt(cod)-catalyzed reaction of silacyclobutane (n = 3) resulted in selective ring-opening polymerization.
Unusual Conformation and Photoisomerization of Retinochrome Analogues with 11-Methylretinals
Authors: Tsujimoto Kazuo , Shirasaka Yasuhiro , Mizukami Taku , Ohashi Mamoru 
Published: July 2004

Abstract
Three kinds of 11-methylretinals were synthesized for elucidating effect of methyl substitution on formation of retinochrome-analogues and their properties. The stable conformation of 11-methylretinal was found as 6,10,12-tri-S-cis conformation based on NOESY measurement. The formed retinochrome-analogues with 11-Me-, 11-Me-13-deMe- and 11-Me-9,13-dideMe-retinals showed their absorption maxima at 450, 470 and 470 nm, respectively. The enzymatic photoisomerization of their retinochrome-analogues gave the 11-cis isomers in 90-91 % regioselectivity. The CD spectra of 11-methylretinochrome exhibited the intense β-band with extremely weak α-band.
Synthesis and Properties of Oligo-para-phenylene Substituted Porphyrins
Authors: Mikami Shinji , Sugiura Ken-ichi , Sakata Yoshiteru 
Published: July 2004

Abstract
A series of oligo-para-phenylene (OPP) substituted new porphyrins was prepared by the combinations of aryl coupling reactions and Lindsey’s pyrrole condensation reactions. Low field shifts of OPP protons in 1H-NMR spectra became larger when the protons locate closer to the center of the molecule.
On the Basicity of Ozone
Authors: Mariey Laurence , Lamotte Jean , Hoggan Philip , Lavalley Jean-Claude , Boulanine Kirill , Tsyganenko Alexei 
Published: July 2004

Abstract
Comparison of IR spectra of species formed from adsorption of different bases on the acidic OH groups of zeolites (HY, MFI) indicates that O3 basicity is close to that of CO. Calculations confirm such a result ; in particular they involve that the terminal oxygen atoms of ozone are the basic centers.
Monoterpenoids, Potent Inducers of Apoptosis in the Cells of Marchantia polymorpha
Authors: Izumi Shunsuke , Nishio Yosuke , Takashima Osamu , Hirata Toshifumi 
Published: July 2004

Abstract
The cultured cells of Marchantia polymorpha suffered apoptosis when treated with monoterpenoids, e.g. bornyl acetate. When the apoptosis occurred, the cultured cells of M. polymorpha produced H2O2, which takes part in a defense reaction. The inhibitors of oxidizing agents, such as cysteine and N-acetylcysteine, had an apparent effect on monoterpenoid-induced apoptosis. These results showed that monoterpenoid-induced apoptosis occurs via the production of active oxygen species, e.g. H2O2.
Hydration of Olefins in Excess Water Catalyzed by an Insoluble Cesium Hydrogen Salt of Dodecatungstophosphoric Acid
Authors: Okuhara Toshio , Kimura Mutsuko , Nakato Teruyuki 
Published: July 2004

Abstract
A solid acid, Cs2.5H0.5PW12O40, efficiently catalyzed hydration of 2,3-dimethylbut-2-ene in excess water at 343 K, while typical oxide-based catalysts such as Nb2O5, SiO2-Al2O3, TiO2-SiO2, and SO42−/ZrO2 were almost inactive. The activity (per unit weight) of Cs2.5H0.5PW12O40 was found to be higher than those of liquid acids like H3PW12O40 and H2SO4, and of a commercial solid acid, H-ZSM-5, for hydration of cyclohexene.
Photocycloaddition of Chloromethyl Alkenyl Ketones with Olefins in the Presence of Silver Trifluoromethanesulfonate
Authors: Sawayanagi Yukihiro , Sato the late Tadashi , Shimizu Isao 
Published: July 2004

Abstract
The photoreaction of chloromethyl alkenyl ketones with olefins in the presence of AgOTf proceeded to give five or six membered cyclic compounds.
Study of cis/trans and endo/exo Diastereoselectivity in the [4+3]-Cycloaddition Reaction of 2-Functionalized Furans and Dimethyloxyallyl Cation: Preparation of Versatile Cycloheptane Synthons
Authors: Montaña Angel M , Ribes Sandra , Grima Pedro M , García Francisca 
Published: July 2004

Abstract
A study on the influence of steric and electronic effects of a function attached at C-2 of furans in the yield and diastereoselectivity of [4+3] cycloaddition reactions with oxyallyl cations is presented. In almost all studied furans a cis diastereospecificity and a high endo diastereoselectivity is observed. Increasing bulkyness of the function attached at C-2 of furans, increases the endo diastereoselectivity, but decreases yield. Increasing the electronic density of the furan system, by an electron donating group attached at C-2, increases yield and diastereoselectivity.
Surface Modified Poly(methyl methacrylate) Microspheres with the O-Methacryloyl-l-serine Moiety
Authors: Shiraishi Kohei , Ohnishi Tunehisa , Sugiyama Kazuo , Okada Kiyotaka , Matsuo Osamu 
Published: July 2004

Abstract
The poly(methyl methacrylate) microspheres [poly(SerMA-co-MMA)], modified their surface with novel zwitterionic O-methacryloyl-l-serine (SerMA) were prepared by emulsifier-free emulsion copolymerization of SerMA and MMA. Poly(SerMA-co-MMA) suppressed the adsorption of serum protein and the activation of platelet.
Effect of the Chain Length in Water Soluble Viologen Linked Zinc Porphyrins on Hydrogen Evolved Activity with Hydrogenase
Authors: Amao Yutaka , Yamane Keisuke , Okura Ichiro 
Published: July 2004

Abstract
Kinetic properties of hydrogen evolution with hydrogenase using water soluble viologen linked zinc porphyrins (ZnP(CnV)4; n = 3-5) as substrate were studied. Among ZnP(CnV)4, ZnP(C5V)4 has high affinity for hydrogenase compared with the other compounds.
Formation of C60 Radical Cation in Iron(III)-Exchanged Zeolite Y
Authors: Fukuzumi Shunichi , Suenobu Tomoyoshi , Urano Tsutomu , Tanaka Keiko 
Published: July 2004

Abstract
When C60 is introduced into the Fe3+-exchanged zeolite Y sample, an intense ESR signal at g = 2.0027 is observed. The ESR signal is due to the formation of C60 radical cation (C60•+), since the signal intensity increases with an increase in the amount of Fe3+ loaded in the zeolite. Addition of perylene into the C60•+-zeolite system results in electron transfer from perylene to C60•+ to produce perylene radical cation accompanied by the disappearance of C60•+.
Effects of Co Ion Dispersion upon Selective Catalytic Reduction of NO on CoO/Al2O3 Catalysts
Authors: Hamada Hideaki , Haneda Masaaki , Kakuta Noriyoshi , Miura Hiroshi , Inami Kazuhiro , Nanba Tetsuya , Hua Wei Qi , Ueno Akifumi , Ohfune Hitoshi , Udagawa Yasuo 
Published: July 2004

Abstract
In alumina-supported cobalt oxide catalyst prepared by sol-gel method, cobalt ions were highly dispersed so as to react with alumina at 773 K to form cobalt aluminate, which enhanced the activity for SCR-NO reaction by propene. While in the catalyst by impregnation cobalt aluminate was not formed at 773 K, which resulted in the poor activity for SCR-NO reaction.
Selective Suppression of Undesirable Competitive Oxidation during Selective Catalytic Reduction of Nitrogen Monoxide by Ethene in Excess Oxygen over Metal-Loaded Aluminas
Authors: Okazaki Noriyasu , Katoh Yoshiki , Shiina Yoshikazu , Tada Akio , Iwamoto Masakazu 
Published: July 2004

Abstract
Calcining cobalt or nickel-loaded alumina at high temperatures suppressed selectively the undesirable oxidation of ethene by oxygen in the selective reduction of nitrogen monoxide by ethene in excess oxygen, while such an effect was not observed over iron-loaded alumina. The reasons were also explained on the basis of the results of XPS studies.
Abiotic Synthesis of Uracil from Carbon Monoxide, Nitrogen and Water by Proton Irradiation
Authors: Kobayashi Kensei , Tsuji Toru 
Published: July 2004

Abstract
A mixture of 13C-carbon monoxide, nitrogen, and water was irradiated with high energy protons. 13C-Labelled uracil was identified in the product by GC/MS, resulting in confirmed abiotic formation of uracil, one of the RNA bases.
Titanocene Induced Deoxygenation of Di-epoxides - A Convenient Regioselective Preparation of 1,3-Diols
Authors: Yadav J S , Srinivas Dale 
Published: July 2004

Abstract
Titanocene induced regioselective opening of 2,4-di-epoxy alcohols to 1-ene-3,5-diols is described. Diepoxy alcohols were treated with 3 eq. of Cp2TiCl in dry THF to obtain 1-ene-3,5 diols with conservation of stereochemistry at C-3 and C-5 was observed.
Photoluminescence and Molecular Structure of Tetrakis(N,N-dimethyldithiocarbamato)europate(III)
Authors: Kobayashi Takeshi , Naruke Haruo , Yamase Toshihiro 
Published: July 2004

Abstract
Photoexcitation of the sulfur(S)-to-europium(Eu) charge-transfer bands in Na[Eu(S2CNMe2)4]·3.5H2O at the low temperature (&lt; 100 K) leads to the 5D0→7FJ (J = 0–4) luminescence of Eu3+ as a result of the energy transfer to the 5D0 state. The luminescence and excitation spectra reveal the dithiocarbamato-ligand phonon-assisted electronic transition involved in the small energy gap (∼1800 cm−1) between the 5D1 and 5D0 levels. The luminescence lifetime (0.11 ± 0.01 ms at 4.2 K) decreases with increasing temperature, probably due to the thermal crossover relaxation from 5D0 to the S→Eu charge transfer states.
Corrosion Resistance and Antibacterial Activity Performances of Ni-TiO2 Composite Coatings
Authors: Zhi-hong Zhao , Sakagami Yoshikazu , Osaka Tetsuya 
Published: July 2004

Abstract
The novel properties for the corrosion resistance in a 5% NaCl salt-spray-test and the inhibitory capability of Ni-TiO2 composite coating for the growth of pathogenic bacteria (E. faecalis, E. coli, and P. aeruginosa), under fluorescent irradiation and using a “drop-method” antibacterial experiment was set forth in this paper. The antibacterial activity of Ni-TiO2 composite coating became more significant by increasing the TiO2 contents in the composite coatings.
Preparation of a New Nanostructured TiO2 Surface Using a Two-Dimensional Array-Based Template
Authors: Matsushita Sachiko , Miwa Tetsuya , Fujishima Akira 
Published: July 2004

Abstract
Nanoporous, nanostructured semiconducting films of photocatalytic titanium dioxide (TiO2) were fabricated by molding from two-dimensionally ordered arrays. We were able to control the structures of the periodic surfaces by varying the annealing temperature of the films.
Electrochemical Study of Biological Functions of Particular Evolutionary Conserved Amino Acid Residues Using Mutated Molecules of Maize Ferredoxin
Authors: Taniguchi Isao , Miyahara Akiko , Iwakiri Ken-ichiro , Hirakawa Yoshihiro , Hayashi Kuniaki , Nishiyama Katsuhiko , Akashi Tetsuyuki , Hase Toshiharu 
Published: July 2004

Abstract
Electrochemical study of mutated maize ferredoxin molecules clearly demonstrated, for the first time, that particular evolutionary conserved amino acid residues have distinguished roles in biological functions such as controlling the redox potential and the complex formation with an enzyme.
Spectroscopic Properties of Er3+-Doped Al2O3-GeO2 Gel
Authors: Kojima Kazuo , Fukuda Tetsuya , Yamazaki Masaaki 
Published: July 2004

Abstract
Effects of Al2O3 codoping on spectroscopic properties such as upconversion fluorescence and electron spin resonance (ESR) were investigated in GeO2 based gels containing Er3+. Clustering of Er3+ ions in the gel was briefly discussed.
Direct Observation of Water Layers on Mica Surface in Water by Atomic Force Microscope
Authors: Su Ming , Bai Chunli , Liu Maozi , Wang Chen 
Published: July 2004

Abstract
Water film on mica surface immersed in water is directly detected and imaged by atomic force microscope. The depressions and islands indicate the existence of water layer, which preserve some solid characters of mica lattice. The observation is attributed to the inhomogeneity and disruption of water layers adjacent to mica.
MRI and plain radiography in the assessment of displaced fractures of the waist of the carpal scaphoid
Authors: Bhat M. , McCarthy M. , Davis T. R. C. , Oni J. A. , Dawson S. 
Published: July 2004

We treated 50 patients with fractures of the waist of the scaphoid in a below-elbow plaster cast for up to 13 weeks. Displacement of the fragments was assessed independently by two observers using MRI and radiographs performed within two weeks of injury. The MRI assessments showed that only the measurement of sagittal translation of the fragments and an overall assessment of displacement had satisfactory inter- and intra-observer reproducibility and revealed that nine of the 50 fractures were displaced. Only three of the 49 fractures with adequate follow-up failed to unite, and all were displaced with more than 1 mm of translation in the sagittal plane. If the MRI assessment of displacement of the fracture was used as the measurement of choice, assessment of displacement on the initial scaphoid series of radiographs showed a sensitivity of between 33% and 47% and a positive predictive value of between 27% and 86%. Neither observer was able correctly to identify more than 33% to 47% of the displaced fractures from the plain radiographs. Although the overall assessment of displacement and gapping and translation in the coronal plane on the plain radiographs influenced the rate of union, none of these parameters identified all three fractures which failed to unite. We conclude that the assessment of displacement of scaphoid fractures on MRI can probably be used to assess the likelihood of union although the small number of nonunions limits the power of the study. In contrast, the assessment of displacement on routine radiography is inaccurate and of less value in predicting union.
Slipped capital femoral epiphysis in skeletally immature patients
Authors: Guzzanti V. , Falciglia F. , Stanitski C. L. 
Published: July 2004

Fixation by a single screw is considered the current treatment of choice for a slipped capital femoral epiphysis. This approach promotes premature physeal closure. The use of a modified, standard, single, cannulated screw designed to maintain epiphyseal fixation without causing premature closure of the physis was reviewed in ten patients. The nine boys and one girl aged between 10.6 and 12.6 years with unilateral slipped capital femoral epiphysis (SCFE), were markedly skeletally immature (Tanner stage I, bone age 10 to 12.6 years). Clinical and radiological review at a mean follow-up of 44.3 months (36 to 76) showed no difference in the time to physeal closure between the involved and uninvolved side. Measurement of epiphyseal and physeal development showed continued growth and remodelling in all patients. Use of this device provided epiphyseal stability and maintained the capacity for physeal recovery and growth following treatment for both unstable and stable slipped capital femoral epiphysis.
Closed argon-based cryoablation of bone tumours
Authors: Bickels J. , Kollender Y. , Merimsky O. , Isaakov J. , Petyan-Brand R. , Meller I. 
Published: July 2004

We report our experience with a new technique for cryosurgical ablation of bone tumours which allows accurate determination of the temperature and freezing time within a cavity of any geometrical shape. Between 1997 and 2000, 58 patients diagnosed with 13 malignant and 45 aggressive benign bone tumours underwent argon-based cryoablation. This technique includes removal of the tumour by curettage and filling the cavity with a gel medium into which metal probes are inserted. Argon gas is delivered through the metal probes and both time and temperature are computer-controlled. After formal reconstruction, all patients were followed for more than two years. None had skin necrosis, infection, neurapraxia or thromboembolic complication. Fractures occurred in two patients (3.4%) and the tumour recurred in two patients (3.4%).