bluuebunny/crossref_metadata_2025_split huggingface dataset:
Platinum-catalyzed Generation of Silylenes from Hydrodisilanes and Their Addition to α,β-Unsaturated Ketones
Authors: Okamoto Kazuhiro , Hayashi Tamio 
Published: December 2007

Abstract
The reaction of hydrodisilanes with α,β-unsaturated ketones in the presence of a platinum catalyst gave high yields of oxasilacyclopentenes, which are probably formed by the addition of silylenes to the enones. Treatment of the oxasilacyclopentenes with methyllithium followed by hydrolysis gave the corresponding β-silyl ketones.
Studies of Germanium–Platinum Bonds in Bis(aryl-substituted Germyl)platinum Complexes by Laser Flash Photolysis and Chemical Trapping Experiments
Authors: Mochida Kunio , Masukawa Yusuke , Yamada Atsuko , Yanaga Mai , Nanjo Masato , Arii Hidekazu , Gohdo Masao , Wakasa Masanobu 
Published: December 2007

Abstract
The UV photolysis of bis(triaryl-substituted germyl)platinum complexes, Pt(Ar3Ge)2(PMe2Ph)2 (Ar = Ph, p-C6H4SiMe3, and p-C6H4C(CH3)3) in THF at room temperature results in Ge–Pt bonds homolysis to give the corresponding germyl radicals.
A Homometallic Ferrimagnet Based on Mixed Antiferromagnetic and Ferromagnetic Interactions through Oxamato and Carboxylato Bridges
Authors: Yoneda Ko , Hori Yukari , Ohba Masaaki , Kitagawa Susumu 
Published: December 2007

Abstract
Two novel coordination polymers (CPs), {Cu[Cu(L)(H2O)-(py)]2}n (1) and {Cu[Cu(L)(MeOH)]2·2H2O}n (2), were synthesized using 2-(oxaloamino)benzoic acid (H3L) providing oxamate and carboxylate groups, and magnetically characterized. Different 2-D layer structures were formed based on oxamato-bridged tricopper units bridging via the carboxylate group. In compound 1, a simple antiferromagnetic interaction operates through the oxamato bridge in the tricopper core, whereas, 2 showed a tendency for ferrimagnetic ordering at 2 K, resulting from mixed antiferromagnetic and ferromagnetic interactions through oxamato and syn–anti-type carboxylato bridges.
Fluorescent Tin(IV) Complexes with Schiff Base Ligands
Authors: Takano Kentaro , Shibahara Takashi 
Published: December 2007

Abstract
Five novel fluorescent Schiff base tin(IV) complexes of the type [SnCl3(L)] were synthesized and their properties were investigated: the emission wavelengths range from bluish green to orange (λmax: 492–545 nm). DFT calculation shows that the order of the magnitudes of HOMO–LUMO gaps is consonant with that of the emission wavelengths (λmax) of the complexes, and good correlation was observed between reduction potentials in DMSO and the energies of LUMO.
Novel Derivatization Reagent, (2,4,5-Trimethyl-3-thienyl)acetic Acid, for Electrogenerated Tris(2,2′-bipyridine)ruthenium(III) Chemiluminescence Detection
Authors: Kodamatani Hitoshi , Komatsu Yu , Yamazaki Shigeo , Saito Keiitsu 
Published: December 2007

Abstract
A novel derivatization reagent for Ru(bpy)33+ (bpy = 2,2′-bipyridine) chemiluminescence (CL) detection has been developed. The derivatization reagent has a thiophene ring for CL reaction and a carboxylic group for derivatization reaction. The derivatized alkylphenols with this reagent were determined by a HPLC–CL detection system.
Thermally Stable Polymer Gel Electrolytes Composed of Branched Polyimide and Ionic Liquid/Zwitterion Mixture Prepared by In Situ Polycondensation
Authors: Tamada Masahiro , Ueda Saori , Hayashi Takahiro , Ohno Hiroyuki 
Published: December 2007

Abstract
Branched polyimide was synthesized by in situ polycondensation of 4,4′-oxydianiline, pyromellitic dianhydride, and 1,3,5-tri(4-aminophenyl)benzene in ionic liquid/zwitterion mixture. Compatibility between network and ionic liquids is important to keep gel shape and ionic conductivity. Only 6.0 wt % of polyimide was enough to keep gel state without phase separation or leakage. The obtained polyimide gel showed excellent thermal stability with decomposition temperature of above 300 °C, low glass-transition temperature, and stable ion conduction in a wide temperature range.
Robustolides H and I, Chlorinated Briaranes from the Gorgonian Ellisella robusta (Ellisellidae)
Authors: Sung Ping-Jyun , Tsai Wei-Tse , Lin Mei-Ru , Su Yin-Di , Pai Chen-Hao , Chung Hsu-Ming , Su Jui-Hsin , Chiang Michael Y 
Published: December 2007

Abstract
Two chlorinated briaranes have been isolated from the gorgonian Ellisella robusta: a new briarane, robustolide H (1) and a known briarane, robustolide I (2). The structure of 1 was determined by spectroscopic methods and the absolute configuration of 2 was established by X-ray diffraction analysis.
Teasing in contact encounters: Frames, participant positions and responses
Authors: Lytra Vally 
Published: December 2007

Abstract
Even though teasing has been extensively examined from an anthropological and sociolinguistic perspective, as a rule, studies on teasing have explored teasing episodes among linguistically, culturally and ethnically homogeneous groups. The present study presents cross-sex teasing episodes between the members of a multilingual/multicultural/multiethnic peer group (comprised of majority Greek children and minority Turkish-speaking children of Roma heritage) during break-time in a primary school in Athens, Greece. Drawing on the micro-analysis of key teasing episodes, it explores the emergence and development of teasing frames in discourse by probing the contextualization cues, participant positions and responses to teasing. To this end, it draws insights from interactional sociolinguistics and Conversation Analysis complemented by ethnographic data on the peer group. It illustrates how peer group members make use of recurring clusters of contextualization cues that draw upon the majority (Greek) and minority (Turkish) languages and cultures to frame their teases. In doing so, they exploit various participant positions and responses to teasing, including silence, which has previously received limited attention in teasing research. The findings of this study are grounded in existing research on Greek and Turkish culture and discourse with special reference to verbal play, verbal duelling and humour.
Self for Sale: Notes on the Work of Hollywood Talent Managers
Authors: David Sasha 
Published: December 2007

AbstractBased upon fieldwork data that the author collected while pursuing an internship at a Hollywood talent management company, this paper examines how Hollywood talent managers must sell themselves in order to sell the actors that they represent. In this marketplace where actors become commodities traded by their managers in exchange for ten percent of their film and television salaries, what is “made to matter” (Butler 1993) is not only the image of the actor, but also the appearances of the individuals who represent them. At the talent management firm in question—which represents about sixty male and female actors, a handful of whom are immediately recognizable names and faces among the American public—the talent managers and assistants invest a significant amount of capital in maintaining immaculately groomed, well‐heeled appearances, while at the same time performing a convivial, and at times even unctuous, persona in their relations with the professionals who cast film and television roles. The physical and social self becomes, in other words, a necessary and high‐stake investment in the talent management industry, which ends up demanding emotional labor, “bodily labor” (Shilling 2005) focused on one's appearance, and the labor of “networking” that entails a merger of business affairs and one's leisurely, domestic or even romantic social relations. In this scenario, the commodification of others therefore requires one's own objectification, so that “an agent"—or a talent manager—"who does not participate in the dialectic of control, in a minimal fashion, ceases to be an agent” (Giddens 1979: 149).
3D Fiber‐Deposited Electrospun Integrated Scaffolds Enhance Cartilage Tissue Formation
Authors: Moroni L. , Schotel R. , Hamann D. , de Wijn J. R. , van Blitterswijk C. A. 
Published: December 2007

AbstractDespite the periodical and completely interconnected pore network that characterizes rapid prototyped scaffolds, cell seeding efficiency remains still a critical factor for optimal tissue regeneration. This can be mainly attributed to the current resolution limits in pore size. We present here novel three‐dimensional (3D) scaffolds fabricated by combining 3D fiber deposition (3DF) and electrospinning (ESP). Scaffolds consisted of integrated 3DF periodical macrofiber and random ESP microfiber networks (3DFESP). The 3DF scaffold provides structural integrity and mechanical properties, while the ESP network works as a “sieving” and cell entrapment system and offers?at the same time?cues at the extracellular matrix (ECM) scale. Primary bovine articular chondrocytes were isolated, seeded, and cultured for four weeks on 3DF and 3DFESP scaffolds to evaluate the influence of the integrated ESP network on cell entrapment and on cartilage tissue formation. 3DFESP scaffolds enhanced cell entrapment as compared to 3DF scaffolds. This was accompanied by a higher amount of ECM (expressed in terms of sulphated glycosaminoglycans or GAG) and a significantly higher GAG/DNA ratio after 28 days. SEM analysis revealed rounded cell morphology on 3DFESP scaffolds. Spread morphology was observed on 3DF scaffolds, suggesting a direct influence of fiber dimensions on cell differentiation. Furthermore, the ESP surface topology also influenced cell morphology. Thus, the integration of 3DF and ESP techniques provide a new set of “smart” scaffolds for tissue engineering applications.
The Chemistry of Fluorescent Bodipy Dyes: Versatility Unsurpassed
Authors: Ulrich Gilles , Ziessel Raymond , Harriman Anthony 
Published: December 2007

AbstractThe world of organic luminophores has been confined for a long time to fairly standard biological labeling applications and to certain analytical tests. Recently, however, the field has undergone a major change of direction, driven by the dual needs to develop novel organic electronic materials and to fuel the rapidly emerging nanotechnologies. Among the many diverse fluorescent molecules, the Bodipy family, first developed as luminescent tags and laser dyes, has become a cornerstone for these new applications. The near future looks extremely bright for “porphyrin's little sister”.
The application of preparative batch HPLC, supercritical fluid chromatography, steady‐state recycling, and simulated moving bed for the resolution of a racemic pharmaceutical intermediate
Authors: Yan Tony Q. , Orihuela Carlos , Swanson David 
Published: December 2007

AbstractThis article discusses the chromatographic resolution of a racemic pharmaceutical intermediate. Preparative batch high performance liquid chromatography (HPLC), supercritical fluid chromatography (SFC), steady‐state recycling (SSR), and simulated moving bed (SMB) were used to resolve a total of 12.2 kg of a racemic pharmaceutical intermediate. In this study, a first batch of 0.8 kg of racemate was separated on the preparative batch HPLC and SFC, and subsequently another 5.9 kg of racemate was separated on the SSR. Lastly, a third batch of 5.5 kg was separated on the SMB. The separation conditions and results of these techniques are discussed. The productivities and solvent costs of SFC versus HPLC are compared. The productivities and solvent costs of SMB, SSR, and HPLC are also compared. The analytical method development and process optimization of these processes are also discussed in this article. Chirality, 2008. © 2007 Wiley‐Liss, Inc.
Enantioseparation of 2‐aryl‐1,3‐dicarbonyl analogues by high performance liquid chromatography using polysaccharide type chiral stationary phase
Authors: Xu Zhe , Ding Zuoding , Xu Xu , Xie Xiaoan 
Published: December 2007

AbstractThe HPLC chiral separation of 21 kinds of 2‐aryl‐1,3‐dicarbonyl analogues was investigated in normal phase mode with amylose tris(3,5‐dimethylphenylcarbamate), amylose tris((S)‐1‐phenylethylcarbamate), cellulose tris(3,5‐dimethylphenylcarbamate), and cellulose tris(4‐methylbenzoate) chiral stationary phases, respectively. The whole set of 2‐aryl‐1,3‐dicarbonyl analogues shows better enantioselectivity and enantioseparation on amylose tris(3,5‐dimethylphenyl carbamate) (Chiralpak AD‐H). The temperature dependence of enantioselectivity was studied to improve the enantioseparation. In addition, efforts are made to relate analyte structure with the quality of the achieved chiral separation. Chirality, 2008. © 2007 Wiley‐Liss, Inc.
Synthesis and characterization of novel chiral ionic liquids and investigation of their enantiomeric recognition properties
Authors: Bwambok David K. , Marwani Hadi M. , Fernand Vivian E. , Fakayode Sayo O. , Lowry Mark , Negulescu Ioan , Strongin Robert M. , Warner Isiah M. 
Published: December 2007

AbstractWe report the synthesis and characterization of amino acid ester based chiral ionic liquids, derived from L‐ and D‐alanine tert butyl ester chloride. The synthesis was accomplished via an anion metathesis reaction between commercially available L‐ and D‐alanine tert butyl ester chloride using a variety of counterions such as lithium bis (trifluoromethane) sulfonimide, silver nitrate, silver lactate, and silver tetrafluoroborate. Both enantiomeric forms were obtained as confirmed by bands of opposite sign in the circular dichroism spectra. The L‐ and D‐alanine tert butyl ester bis (trifluoromethane) sulfonimide were obtained as liquids at room temperature and intriguingly exhibited the highest thermal stability (up to 263°C). In addition, the ionic liquids demonstrated enantiomeric recognition ability as evidenced by splitting of racemic Mosher's sodium salt signal using a liquid state 19F nuclear magnetic resonance (NMR) and fluorescence spectroscopy. The L‐ and D‐alanine tert butyl ester chloride resulted in solid salts with nitrate, lactate, and tetrafluoroborate anions. This illustrates the previously observed tunability of ionic liquid synthesis, resulting in ionic liquids of varying properties as a function of varying the anion. Chirality, 2008. © 2007 Wiley‐Liss, Inc.
Ultrasonic Solvent Extraction of Persistent Organic Pollutants from Airborne Particles
Authors: Aydin Mehmet Emin , Ozcan Senar , Tor Ali 
Published: December 2007

AbstractUltrasonic solvent extraction of persistent organic pollutants including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and organochlorine pesticides (OCPs) from airborne particles is reported. The extraction was optimized as functions of type and amount of solvent, sonication time, and number of extraction steps. Determination of PAHs and PCBs carried out by GC/MSD, while OCPs were determined using GC/μ‐ECD. The optimum extraction procedure was determined as three times consecutive extraction using a 25 mL mixture of n‐hexane:petroleum ether (1/1, v/v) for 15 min of sonication. Recoveries were obtained between 91 ± 2 and 96 ± 1% with Relative Standard Deviation (RSD) ⪇ ± 4% for PCBs, for PAHs recoveries (except for naphthalene, < 31%) were between 66 ± 6 and 90 ± 4% with RSD ⪇ ± 8% while OCPs compounds recoveries were between 67 ± 5 and 120 ± 7% with RSD ⪇ ± 7%. When comparing the Soxhlet extraction method with optimized ultrasonic solvent extraction method, extraction time and solvent volume were reduced considerably with the ultrasonic solvent extraction method without reducing extraction efficiency. In addition, a simultaneous analysis of PCBs, PAHs, and OCPs in one sampling by the optimized method is quite advantageous in terms of analysis time and cost.
Development of a Model Support System for Watershed Modeling: A Case Study from Turkey
Authors: Yuceil Kiziltan , Baloch Mansoor Ahmed , Gonenc Ethem , Tanik Aysegul 
Published: December 2007

AbstractNon‐point source (NPS) modeling requires a vast amount of diverse data for simulation of watershed processes. The data gathering process in developing countries is a challenging task because of data scarcity and reliability, gaps in available data, and data suitability as model input together with temporal and spatial availability of data. A Model Support System (MSS) encompasses the entirety of the processes which precede the simulations. This study documents the concepts of MSS and modeling project management cycle, and defines a pathway on how the modeling efforts should be organized towards an integrated watershed management goal. It emphasizes that in the developing countries, establishing an MSS for rural NPS modeling is almost as challenging as developing a calibrated and validated model. An MSS based on difficulties, and workarounds bound to local conditions for the Koycegiz‐Dalyan watershed located in Turkey is presented as a case study. Moreover, Hydrological Simulation Program‐Fortran (HSPF) is executed by the gathered and derived data, which produced acceptably positive results. A stepwise documentation on how to initiate and proceed with a project for “non‐point source modeling” is made available for use of decision‐makers, researchers and modelers to replicate these studies on other sensitive watersheds of Turkey or to expand these efforts by filling necessary research/resource gaps highlighted by this study.
Groundwater Protection: A Comparative Study of Four Vulnerability Mapping Methods
Authors: Yıldırım Mustafa , Topkaya Bülent 
Published: December 2007

AbstractThe catchment area of the groundwater resources supplying Antalya City consists of travertine rock formations. As a result of the extreme permeability of this formation, the groundwater resources are highly susceptible to pollution. In recent years this resource has been subject to severe human impact. Especially the newly constructed residential centers in this area constitute a severe threat, as the produced wastewater in these areas is mainly disposed via percolating septic tanks. The main task for future development is to protect these karst aquifers from pollution originating from humans. The mapping of groundwater vulnerability to pollution is widely used as a tool for the protection of groundwater resources all over the world. These kinds of maps can also be used by decision makers in the framework of environmental management and in developing land use plans. On the other hand reliability and accuracy of these vulnerability maps are the key issue for their usage. For the determination of the groundwater vulnerability, different methods can be used. In this study, DRASTIC, SINTACS, PI and COP methods are evaluated for their effectiveness in assessing the vulnerability of the groundwater resources to pollution. While PI and COP methods respond the karst characteristics in Antalya better than DRASTIC and SINTACS, the combined use of different methods evaluates the region at a good and acceptable level, as well.
Failure of concrete canal lining on fine sandy soils: a case study for the Saveh Project
Authors: Rahimi Hassan , Abbasi Nader 
Published: December 2007

AbstractThis paper presents the results of an investigation conducted on the causes of failure of concrete linings in the Saveh Irrigation Project. Firstly, a detailed field survey was performed and all previous technical reports on this subject were studied. Then, several test pits were dug at 500 m intervals along the canal embankment as well as its centre line and soil samples were taken from different depths at 50 cm intervals. All samples were tested for their chemical, physical and mechanical properties. The results of the tests showed that most samples were sandy and classified as chemically non‐dispersive. However, the results of pinhole tests showed that some samples are physically medium to highly dispersive. Based on the overall results of the field and laboratory investigations, the main causes of the damage to the lining were related to three groups, i.e. design parameters, construction quality, and geotechnical properties of the foundation soil. Among these, the latter was mainly responsible for the damage. Based on the nature of damage, few remedial measures have been suggested. The canal was monitored for the last four years and no further indication of damage has been observed since then. Copyright © 2007 John Wiley & Sons, Ltd.
Long‐term effect of varicocele repair on intratesticular arterial resistance index
Authors: Balci Ali , Karazincir Sinem , Gorur Sadik , Sumbas Haldun , Egilmez Ertugrul , Inandi Tacettin 
Published: December 2007

AbstractPurposeTo investigate the long‐term effect of varicocele repair on ipsilateral intratesticular arterial resistance index (RI) using color Doppler sonography (CDS).MethodsA total of 26 infertile patients with left varicocele who underwent a testicular artery and lymphatic‐sparing subinguinal varicocelectomy were examined with CDS for intratesticular flow parameters before and at least 6 months after surgery. We also evaluated preoperative and postoperative semen parameters.ResultsThe mean values of RI, end‐diastolic velocity and pulsatility index decreased significantly after surgery, whereas no significant change was observed in peak systolic velocity. Repair of the varicocele resulted in a statistically significant increase in the total sperm count, motility, morphology, and total motile sperm count. However, no significant correlation was found between sperm parameters and RI values (p > 0.05).ConclusionsOur data show that a significant improvement occurs in testicular blood supply and sperm parameters after surgical varicocele repair, without significant correlation between these 2 changes. © 2007 Wiley Periodicals, Inc. J Clin Ultrasound, 2008
Sulfated polymannuroguluronate, a novel anti‐acquired immune deficiency syndrome drug candidate, decreased vulnerability of PC12 cells to human immunodeficiency virus tat protein through attenuating calcium overload
Authors: Hui Bin , Li Jing , Geng Mei Yu 
Published: December 2007

AbstractHuman immunodeficiency virus (HIV)‐1 infection of the central nervous system occurs in the vast majority of HIV‐infected patients. HIV‐associated dementia (HAD) represents the most severe form of HIV‐related neuropsychiatric impairment. The pathogenesis of HAD is mediated by disruption of neuronal cell signal pathways, which ultimately triggers neuronal apoptosis. Evidence indicates that a viral gene product, the transactivator of transcription protein (Tat), takes a responsive role to these events. We herein report that sulfated polymannuroguluronate (SPMG), a novel anti‐acquired immunodeficiency syndrome drug candidate now in phase II clinical trial, significantly decreased vulnerability of PC12 cells to HIV Tat protein by protecting cells from apoptosis. Furthermore, SPMG potently arrested Tat‐triggered PKCδ and PKCθ activation and blocked the downstream apoptosis signaling pathways mediated by both ERK1/2 and caspase‐3. These molecular mechanisms were attributed to the fact that SPMG reduced Tat‐evoked calcium overload. These data demonstrate that SPMG might serve as a valuable therapeutic intervention for Tat‐induced neuronal cell death and the subsequent pathologic events of HAD. © 2007 Wiley‐Liss, Inc.
Rigorous stochastic bounds for the error in large covariance matrices
Authors: Böttcher Albrecht , Wenzel David 
Published: December 2007

AbstractThis paper is motivated by recent studies of Huang et al. on distributed PCA and network anomaly detection and contains a rigorous derivation of bounds for the expected value and the variance of the spectral norm of the error in large covariance matrices. This derivation is based on a deep result by Yin et al. (Probab. Theor. Relat. Fields 1988; 78:509–521), which gives the asymptotics of the maximal eigenvalue of a random matrix as the matrix dimension goes to infinity. Copyright © 2007 John Wiley & Sons, Ltd.