bluuebunny/crossref_metadata_2025_split huggingface dataset:
Potentially Toxic Elements Contamination in Urban Soils
Authors: Biasioli M. , Grčman H. , Kralj T. , Madrid F. , Díaz‐Barrientos E. , Ajmone‐Marsan F. 
Published: January 2007

ABSTRACTStudies on several cities around the world confirm that urban soils are subject to heavy anthropogenic disturbance. However, these surveys are difficult to compare due to a lack of common sampling and analytical protocols. In this study the soils of Ljubljana (Slovenia), Sevilla (Spain), and Torino (Italy) were extensively sampled and analyzed using common procedures. Results highlighted similarities across the cities, despite their differences in geography, size, climate, etc. Potentially toxic elements (PTE) showed a wide range in concentration reflecting a diffuse contamination. Among the “urban” elements Pb exceeded the legislation threshold in 45% of Ljubljana, 43% of Torino, and 11% of Sevilla samples while Zn was above the limits in 20, 43, and 2% of the soils of Ljubljana, Torino, and Sevilla, respectively. The distribution of PTE showed no depth‐dependant changes, while general soil properties seemed more responsive to anthropogenic influences. Multivariate statistics revealed similar associations between PTE in the three cities, with Cu, Pb, and Zn in a group, and Ni and Cr in another, suggesting an anthropogenic origin for the former group and natural one for the latter. Chromium and Ni were unaffected by land use, except for roadside soils, while Cu, Pb, and Zn distribution appeared to be more dependent on the distance from emission sources. Regardless of the location, climate, and size, the “urban” factor—integrating type and intensity of contaminant emission and anthropogenic disturbance—seems to prevail in determining trends of PTE contamination.
The inter‐relations of mother and father attachment, self‐esteem and aggression during late adolescence
Authors: Gomez Rapson , McLaren Suzanne 
Published: January 2007

AbstractThis study examined three models depicting the relations between mother and father attachment, self‐esteem and aggression. A total of 385 participants (173 males and 212 females), aged from 18 to 20 years, completed self‐rating questionnaires covering mother and father attachment, self‐esteem and aggression. Results showed that self‐esteem had additive and mediation effects on both the father attachment–aggression and mother attachment–aggression relationships, and also moderated the mother attachment–aggression relation. These findings are discussed in terms of different models for the inter‐relations of mother and father attachment, self‐esteem and aggression in late adolescence. Aggr. Behav. 33:1–10, 2007. © 2006 Wiley‐Liss, Inc.
4‐Hydroxyphenylglycine‐Based Oxazaborolidines for Enantioselective Reductions of Ketones
Authors: Braun Manfred , Sigloch Michael , Cremer Jens 
Published: January 2007

AbstractAmino alcohols 6 featuring the diphenylhydroxymethyl group are prepared from the commercial amino acid (R)‐4‐hydroxyphenylglycine 3. Oxazaborolidines generated in situ from the amino alcohols 6 and borane‐dimethyl sulfide serve as catalysts in enantioselective reductions of acetophenone. The para‐substituents of the phenyl ring at the stereogenic carbon atom have a substantial influence on the enantioselectivity. When mediated by the nonaflate 6d, the reduction of ketones 7, 9, 11, and 13 leads to the carbinols 8, 10, 12, and 14 in 90 to 96 % ee.
Palladium‐Catalyzed N‐Arylation of N,N‐Dialkylhydrazines with Aryl Chlorides
Authors: Cacchi Sandro , Fabrizi Giancarlo , Goggiamani Antonella , Sgalla Simona 
Published: January 2007

AbstractN,N‐Dialkyl‐N′‐arylhydrazines have been prepared usually in high to excellent yields via the reaction of N,N‐dialkylhydrazines with aryl chlorides in the presence of Pd2(dba)3, Xphos and NaO‐t‐Bu in dioxane at 120 °C. With ortho‐substituted aryl chlorides best results have been obtained by using 2‐(2′,6′‐dimethoxybiphenyl)dicyclohexylphosphine (ligand d) as the ligand.
Asymmetric Cyanoethoxycarbonylation of Aldehydes Catalyzed by Heterobimetallic Aluminum Lithium Bis(binaphthoxide) and Cinchonine
Authors: Gou Shaohua , Wang Jun , Liu Xiaohua , Wang Wentao , Chen Fu‐Xue 
Published: January 2007

AbstractHighly efficient catalytic asymmetric cyanoethoxycarbonylation of aldehydes was achieved by 10 mol % cinchonine with 10 mol % heterometallic (S)‐aluminum lithium bis(binaphthoxide), which gave the cyanohydrins ethyl carbonates in excellent isolated yields (up to 99 %) with moderate to high enantioselectivities (up to 95 % ee) under mild conditions (at −20 °C). Especially, the solid aluminum lithium bis(binaphthoxide) free of tetrahydrofuran was obtained by a new procedure using (S)‐bi(2‐naphthol), aluminum isopropoxide and n‐butyllithium in dichloromethane, which was insensitive to air and moisture and was very convenient to store and use. A catalytic cycle based on experimental phenomena was proposed to explain the nature of the asymmetric induction.
Desulfitative Carbon–Carbon Cross‐Coupling of Thioamide Fragments with Boronic Acids
Authors: Prokopcová Hana , Kappe C. Oliver 
Published: January 2007

AbstractA novel and general carbon–carbon cross‐coupling reaction between cyclic thioamides and boronic acids is described. The reaction is catalytic in palladium(0) and requires stoichiometric amounts of a copper(I) carboxylate as metal cofactor. The mode of cross‐coupling in the reaction of cyclic thioamides with boronic acids is easily tunable between carbon–carbon and carbon–sulfur cross‐coupling. While the catalytic palladium(0)/copper(I) system provides carbon–carbon bond formation with extrusion of sulfur, stoichiometric quantities of copper(II) under air mediate carbon–sulfur bond formation.
Hb Indianapolis [β112 (G14) Cys→Arg] as the probable cause of moderate hemolytic anemia and renal damage in a Brazilian patient
Authors: Fattori A. , Kimura E.M. , Albuquerque D.M. , Oliveira D.M. , Costa F.F. , Sonati M.F. 
Published: January 2007

AbstractHemoglobin (Hb) Indianapolis [β112 (G14) Cys→Arg] is a rare and slightly unstable β‐globin variant. All carriers described to date were clinically normal with only mild reticulocytosis. We report here a case of a Brazilian patient in whom hemolytic anemia and acute renal failure were probably caused by the presence of this variant. Am. J. Hematol., 2007. © 2007 Wiley‐Liss, Inc.
Follow‐up: Deliverables for ABA mediation quality task force begin to emerge
Authors: Bleemer Russ 
Published: January 2007

AbstractTwo follow‐ups: The American Bar Association Section of Dispute Resolution's Task Force on Quality in Mediation is getting results from its focus group effort, and the direction of its work is taking shape. Possible focuses are detailed. Also, the American Arbitration Association completes the sale of its large conflict resolution library. Find out why it was sold to Pepperdine University
Diselenastanna‐, ‐sila‐ and ‐carbacycles with an annelated dicarba‐closo‐dodecaborane(12) unit
Authors: Wrackmeyer Bernd , Hernández Zureima García , Kempe Rhett , Herberhold Max 
Published: January 2007

AbstractThe reactions of the 1,2‐diselenolato‐1,2‐dicarba‐closo‐dodecaborane(12) dianion 1 with diorganoelement(IV) dichlorides (Ph2CCl2, Me2SiCl2, Ph2SiCl2, Me2SnCl2, Ph2SnCl2) gave novel five‐member heterocycles along with other products. The molecular structures of the five‐member rings containing CPh2 (2) and SnPh2 (9) moieties between the selenium atoms were determined by X‐ray analyses. In the case of the chlorosilanes, the analogous five‐member ring containing the SiPh2 unit (4) could be identified in mixtures. The expected reaction was accompanied by rearrangement leading to formation of another five‐member ring 6 containing the Ph2SiSeSe moiety. Oxidative addition of the five‐member heterocycles containing tin (7, 9) to ethene‐bis(triphenylphosphane)platinum(0) gave at low temperature the bis(triphenylphosphane)platinum(II) complexes 12 and 13, where the Pt(PPh3)2 fragment had been inserted into one of the SnSe bonds. Extensive decomposition of these complexes was observed above − 20 °C. The proposed solution‐state structures of the new compounds are supported by multinuclear magnetic resonance data (1H, 11B, 13C, 29Si, 31P, 77Se, 119Sn and 195Pt NMR). Copyright © 2007 John Wiley & Sons, Ltd.
Ground‐penetrating radar investigations into the construction techniques of the Concordia Temple (Agrigento, Sicily, Italy)
Authors: Barone P. M. , Graziano F. , Pettinelli E. , Corradini R. Ginanni 
Published: January 2007

AbstractOver the past decade, ground‐penetrating radar (GPR) has been recognized as being particularly well adapted to the non‐destructive survey of archaeological sites. The present work discusses such an application of the GPR to the study of the foundation geometry of the Concordia Temple in Agrigento (Sicily, southern Italy).Radar data were collected using a pulse EKKO 1000 unit (Sensors and Software, Inc.) with 225 MHz antennae. The GPR data show a regular sequence of short reflectors alternating with ‘signal blanked’ areas located at approximately 50 ns in the peristyle and a continuous horizontal reflector at approximately 30 ns within the inner part of the temple (the cell). These results may indicate that the construction technique used in the temple was not a compact and homogeneous retaining wall, consisting of an outside layer of bricks and various grouting materials, as was previously thought. The two‐dimensional images indicate, instead, that the Greeks made use of the geomorphology of the surrounding area, which involved exploiting the surrounding landscape to obtain foundations (artificial and natural) capable of supporting such monumental and stately buildings. Furthermore, the paper demonstrates the validity of this technique to investigate the foundation geometry of an ancient temple, where it is undesirable to apply a destructive technique. Copyright © 2007 John Wiley & Sons, Ltd.
Kojic acid–tripeptide amide as a new tyrosinase inhibitor
Authors: Noh Jin‐Mi , Kwak Seon‐Yeong , Kim Do‐Hyun , Lee Yoon‐Sik 
Published: January 2007

AbstractTwenty two kojic acid–tripeptide amides were prepared using a solid‐phase Fmoc/tBu strategy with Rink Amide SURE® resin. To effectively obtain kojic acid–tripeptide amide conjugates, the coupling conditions of kojic acid to the tripeptide on the resin were optimized. The tyrosinase inhibitory activity of kojic acid–tripeptide amides and the effect of the amino acid sequence on the activity were compared with those of kojic acid–tripeptide acids. The stability of kojic acid–tripeptide amides were then compared with those of kojic acid and kojic acid–tripeptides acids. As a consequence, kojic acid‐FWY‐NH2 proved to be the best compound, with the highest inhibitory activity, which was maintained over different storage times under various temperatures and pHs. © 2007 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 88: 300–307, 2007.This article was originally published online as an accepted preprint. The ‘Published Online’ date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Chromatin dynamics of unfolding and refolding controlled by the nucleosome repeat length and the linker and core histones
Authors: Kobori Toshiro , Iwamoto Satoshi , Takeyasu Kunio , Ohtani Toshio 
Published: January 2007

AbstractChromatin is composed of genomic DNA and histones, forming a hierarchical architecture in the nucleus. The chromatin hierarchy is common among eukaryotes despite different intrinsic properties of the genome. To investigate an effect of the differences in genome organization, chromatin unfolding processes were comparatively analyzed using Schizosaccaromyces pombe, Saccharomyces cerevisiae, and chicken erythrocyte. NaCl titration showed dynamic changes of the chromatin. 400–1000 mM NaCl facilitated beads with ∼115 nm in diameter in S. pombe chromatin. A similar transition was also observed in S. cerevisiae chromatin. This process did not involve core histone dissociation from the chromatin, and the persistence length after the transition was ∼26 nm for S. pombe and ∼28 nm for S. cerevisiae, indicating a salt‐induced unfolding to “beads‐on‐a‐string” fibers. Reduced salt concentration recovered the original structure, suggesting that electrostatic interaction would regulate this discrete folding‐unfolding process. On the other hand, the linker histone was extracted from chicken chromatin at 400 mM NaCl, and AFM observed the “beads‐on‐a‐string” fibers around a nucleus. Unlike yeast chromatin, therefore, this unfolding was irreversible because of linker histone dissociation. These results indicate that the chromatin unfolding and refolding depend on the presence and absence of the linker histone, and the length of the linker DNA. © 2007 Wiley Periodicals, Inc. Biopolymers 85:295–307, 2007.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Intramolecular and intermolecular guanine quadruplexes of DNA in aqueous salt and ethanol solutions
Authors: Vorlíčková Michaela , Bednářová Klára , Kejnovská Iva , Kypr Jaroslav 
Published: January 2007

AbstractDNA guanine quadruplexes are all based on stacks of guanine tetrads, but they can be of many types differing by mutual strand orientation, topology, position and structure of loops, and the number of DNA molecules constituting their structure. Here we have studied a series of nine DNA fragments (G3Xn)3G3, where X = A, C or T, and n = 1, 2 or 3, to find how the particular bases and their numbers enable folding of the molecule into quadruplex and what type of quadruplex is formed. We show that any single base between G3 blocks gives rise to only four‐molecular parallel‐stranded quadruplexes in water solutions. In contrast to previous models, even two Ts in potential loops lead to tetramolecular parallel quadruplexes and only three consecutive Ts lead to an intramolecular quadruplex, which is antiparallel. Adenines make the DNA less prone to quadruplex formation. (G3A2)3G3 folds into an intramolecular antiparallel quadruplex. The same is true with (G3A3)3G3 but only in KCl. In NaCl or LiCl, (G3A3)3G3 prefers to generate homoduplexes. Cytosine still more interferes with the quadruplex, which only is generated by (G3C)3G3, whereas (G3C2)3G3 and (G3C3)3G3 generate hairpins and/or homoduplexes. Ethanol is a more potent DNA guanine quadruplex inducer than are ions in water solutions. It promotes intramolecular folding and parallel orientation of quadruplex strands, which rather corresponds to quadruplex structures observed in crystals. © 2007 Wiley Periodicals, Inc. Biopolymers 86: 1–10, 2007.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Hydration study of homopolypeptides by 2H NMR
Authors: Peemoeller H. , Stanley J. A. , MacMillan M. B. , Weglarz W. P. , Bennett J. C. , Corbett J. M. , Hawton M. , Holly R. 
Published: January 2007

AbstractDeuteron T1 and T2 was studied as a function of hydration in homopolyglycine (PG) and homopolyproline (PP). Water deuteron relaxation rates in PG conform to a hydration model involving two types of primary hydration sites where water is directly bonded to the polymer. Once these sites are filled, additional water only bonds to water molecules at the primary sites and in so doing affect their dynamics. PP exhibits an anomalous T1 and T2 hydration dependence which has been interpreted in terms of a cooperative water molecule–PP molecule helical conformational rearrangement which occurs once a certain hydration level is reached. The proposal of a water–PP structure is tested using molecular dynamics simulations. © 2007 Wiley Periodicals, Inc. Biopolymers 86: 11–22, 2007.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Sequence‐based modeling of Aβ42 soluble oligomers
Authors: Dulin Fabienne , Callebaut Isabelle , Colloc'h Nathalie , Mornon Jean‐Paul 
Published: January 2007

AbstractAβ fibrils, which are central to the pathology of Alzheimer's disease, form a cross‐β‐structure that contains likely parallel β‐sheets with a salt bridge between residues Asp23 and Lys28. Recent studies suggest that soluble oligomers of amyloid peptides have neurotoxic effects in cell cultures, raising the interest in studying the structures of these intermediate forms. Here, we present three models of possible soluble Aβ forms based on the sequences similarities, assumed to support local structural similarities, of the Aβ peptide with fragments of three proteins (adhesin, Semliki Forest virus capsid protein, and transthyretin). These three models share a similar structure in the C‐terminal region composed of two β‐strands connected by a loop, which contain the Asp23‐Lys28 salt bridge. This segment is also structurally well conserved in Aβ fibril forms. Differences between the three monomeric models occur in the N‐terminal region and in the C‐terminal tail. These three models might sample some of the most stable conformers of the soluble Aβ peptide within oligomeric assemblies, which were modeled here in the form of dimers, trimers, tetramers, and hexamers. The consistency of these models is discussed with respect to available experimental and theoretical data. © 2007 Wiley Periodicals, Inc. Biopolymers 85: 422–437, 2007.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
Surface‐Plasmon‐Resonance‐Based Chemical Proteomics: Efficient Specific Extraction and Semiquantitative Identification of Cyclic Nucleotide‐Binding Proteins from Cellular Lysates by Using a Combination of Surface Plasmon Resonance, Sequential Elution and Liquid Chromatography–Tandem Mass Spectrometry
Authors: Visser Natasja F. C. , Scholten Arjen , van den Heuvel Robert H. H. , Heck Albert J. R. 
Published: January 2007

AbstractChemical proteomics is a powerful methodology for identifying the cellular targets of small molecules, however, it is biased towards abundant proteins. Therefore, quantitative strategies are needed to distinguish between specific and nonspecific interactions. Here, we explore the potential of the combination of surface plasmon resonance (SPR) coupled to liquid chromatography–tandem mass spectrometry (LC‐MS/MS) as an alternative approach in chemical proteomics. We coupled cGMP molecules to the SPR chip, and monitored the binding and dissociation of proteins from a human lysate by using sequential elution steps and SPR. The eluted proteins were subsequently identified by LC‐MS/MS. Our approach enabled the efficient and selective extraction of low‐abundant cyclic‐nucleotide‐binding proteins such as cGMP‐dependent protein kinase, and a quantitative assessment of the less‐ and nonspecific competitive binding proteins. The data show that SPR‐based chemical proteomics is a promising alternative for the efficient specific extraction and quantitative identification of small‐molecule‐binding proteins from complex mixtures.
Intra‐ and Intermolecular Reactions of Indoles with Alkynes Catalyzed by Gold
Authors: Ferrer Catalina , Amijs Catelijne H. M. , Echavarren Antonio M. 
Published: January 2007

AbstractIndoles react intramolecularly with alkynes in the presence of gold catalysts to give from six‐ to eight‐membered‐ring annulated compounds. The cationic AuI complex [Au(P{C6H4(o‐Ph)}(tBu)2)(NCMe)]SbF6 is the best catalyst for the formation of six‐ and seven‐membered rings by 6‐endo‐dig, 6‐exo‐dig, and 7‐exo‐dig cyclizations. Indoloazocines are selectively obtained with AuCl3 as catalyst in a rare 8‐endo‐dig process. In this process allenes or tetracyclic annulated derivatives are also formed as a result of an initial fragmentation reaction. The intermolecular reaction of indoles with alkynes proceeds to form 3‐alkenylated intermediates that react with a second equivalent of indole to give bisindolyl derivatives. Indoles that are substituted at the 3‐position react intermolecularly with alkynes to give 2‐alkenylated intermediates that can be trapped intramolecularly with the appropriate nucleophiles.
Quasilinear Molecule par Excellence, SrCl2: Structure from High‐Temperature Gas‐Phase Electron Diffraction and Quantum‐Chemical Calculations—Computed Structures of SrCl2×Argon Complexes.
Authors: Varga Zoltan , Lanza Giuseppe , Minichino Camilla , Hargittai Magdolna 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Thermal Conductivity and Viscosity of Aqueous Mg(NO3)2, Sr(NO3)2, Ca(NO3)2, and Ba(NO3)2 Solutions.
Authors: Akhmedova‐Azizova Lala A. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The (x, T) Magnetic Phase Diagram of Y2Co17‐xCrx (1.17 ≤ x ≤ 3) Compounds by Neutron Diffraction.
Authors: Schobinger‐Papamantellos P. , Buschow K. H. J. , Fuquan B. , Tegus O. , Brueck E. , de Boer F. R. , Ritter C. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Phase Relations in the Cu—La—Sb System at 693 K.
Authors: Zeng Lingmin , Zhang Jiliang , Liao Jiangping , Qin Pingli 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Prediction of Tetraoxygen Formation on Rutile TiO2(110).
Authors: Pillay Devina , Wang Yun , Hwang Gyeong S. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
K3Ln(AsS4)2 (Ln: Nd, Sm, Gd): The First Rare Earth Thioarsenate Compounds with Infinite Straight ∞1[Ln(AsS4)2]3‐ Chains.
Authors: Wu Yuandong , Naether Christian , Bensch Wolfgang 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Sm2Se5O13: A Selenite—Diselenite According to Sm2(SeO3)(Se2O5)2.
Authors: Wickleder Mathias S. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Sm2O2I — A Mixed‐Valence Samarium(II,III) Oxide Halide.
Authors: Ryazanov Mikhail , Hoch Constantin , Mattausch Hansjuergen , Simon Arndt 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Chemical Vapor Deposition of Iron and Iron Oxide Thin Films from Fe(II) Dihydride Complexes.
Authors: Park Sungho , Lim Sangho , Choi Hyungsoo 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.