bluuebunny/crossref_metadata_2025_split huggingface dataset:
Large‐Scale Synthesis of Single‐Crystalline RE2O3 (RE=Y, Dy, Ho, Er) Nanobelts by a Solid–Liquid‐Phase Chemical Route
Authors: Han Min , Shi Nai‐En , Zhang Wen‐Li , Li Bao‐Jun , Sun Jian‐Hua , Chen Kun‐Ji , Zhu Jian‐Ming , Wang Xin , Xu Zheng 
Published: November 2007

AbstractYttrium‐group heavy rare‐earth sesquioxide (RE2O3, RE=Y, Dy, Ho, Er) nanobelts were successfully fabricated by thermolysis of solid RE(NO3)3⋅x H2O in a dodecylamine/1‐octadecene mixed solvent system. The synthetic principle is based on separating the nucleation and growth processes by utilizing the poor solubility of RE(NO3)3⋅χ H2O in the solvent mixture and the heat‐transportation difference between the liquid and solid. By using dodecylamine, RE2O3 nanobelts can be readily obtained. X‐ray diffraction (XRD) analysis shows that the synthesized RE2O3 nanobelts are body‐centered cubic and crystalline. Field‐emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), selective‐area electron diffraction (SAED), and high‐resolution transmission electron microscopy (HR‐TEM) demonstrate that the synthesized RE2O3 compounds possess regular geometric structure (beltlike) with perfect crystallinity. Preliminary experimental results prove that the dodecylamine plays a key role in the formation of RE2O3 nanobelts and cannot be replaced by other surfactants. Furthermore, this method can be extended to the synthesis of RE2O3 nanobelt/metal nanocrystal nanocomposites and ABO3 (A=Y, Dy, Ho, Er; B=Al) and A3B5O12 (A=Y, Dy, Ho, Er; B=Al)‐type ternary oxide nanobelts, using mixed‐metal nitrate salts in the correct stoichiometry instead of single rare‐earth nitrates.
Titania‐Coated Platinum Thin Films by MOCVD: Electrochemical and Photoelectrochemical Properties
Authors: Daniele S. , Battistel D. , Gerbasi R. , Benetollo F. , Battiston S. 
Published: November 2007

AbstractPt films are deposited on glass rods from Pt(acac)2 and H2O in the thickness range 10–200 nm. Voltammetric measurements show that a 100 nm Pt film behaves like a bulk Pt electrode. A series of 100 nm Pt films are then coated with anatase TiO2 films 15–100 nm thick using Ti(OiPr)4 as the precursor. The electrochemical properties of the Pt–TiO2 electrodes, investigated by cyclic voltammetry in aqueous solutions, indicate that the passivating TiO2 layer induces some kinetic inhibitions into the heterogeneous electron transfer process of Ru(NH3)63+, which is utilized as a probe molecule. The photoelectrochemical performance of the Pt–TiO2 films demonstrates an optimum behavior for 100 nm TiO2 coatings. The photocatalytic properties of the Pt–TiO2 films can be exploited for electrocatalytic applications in sensor technology.
Optimization of the Vaporization of Liquid and Solid CVD Precursors: Experimental and Modeling Approaches
Authors: Maury F. , Duminica F.‐D. , Senocq F. 
Published: November 2007

AbstractTwo representative examples of the vapor phase transport of liquid and solid molecular precursors from a bubbler and a saturator, respectively, are presented. The influence of the vaporization conditions on the amount of vaporized precursor makes it possible to propose a model suitable for delivering high flow rates for, for instance, large‐scale reactors or continuous deposition in conveyor‐belt reactors. For the liquid compound Ti(OiPr)4 (TTIP) used in atmospheric pressure CVD of TiO2 thin films, the vapor flow rate increases linearly with the carrier gas flow rate up to a critical value, and also exponentially with the bubbler temperature. A numerical model is developed to simulate the experimental data. To illustrate the case of solid precursor, the sublimation of Fe(C5H5)2, used in the MOCVD of iron thin films, is studied. In this case, the amount of vaporized ferrocene is not proportional to the carrier gas flow rate. A model is developed for a powdery precursor, taking into account the gas/solid exchange surface and therefore the initial amount of precursor in the saturator. It can be used to predict the best vaporization conditions required to maximize and keep constant the precursor flow rate delivered to the CVD reactor.
Geographical clustering of eating disordered behaviors in U.S. high school students
Authors: Forman‐Hoffman Valerie L. , Cunningham Cassie L. 
Published: November 2007

AbstractObjective:The aim of this study was to determine if eating disorder behaviors geographically clustered among U.S high school students.Method:Our sample consisted of 15,349 high school students who responded to the 1999 Youth Risk Behavior Study (YRBS). Weight control and eating disordered behaviors under investigation included dieting, exercising, fasting, using diet pills, and purging to control weight in the last 30 days. We calculated pairwise odds ratios (PWORs) to determine the degree of within‐county clustering.Results:Among all participants, adjusted analyses revealed that having any weight control or eating disorder symptom, severe restricting, dieting, exercising, and diet pill use each showed significant clustering (p < .05). Purging did not significantly cluster by county. The magnitude of clustering was stronger for female students than male students.Conclusion:The significant clustering of weight control and eating disorder behavior in U.S. high school students confirms evidence of a social contagion effect of eating disorders. © 2007 by Wiley Periodicals, Inc. Int J Eat Disord 2008
Organization of the Ru2Na Moiety of a Phenazine Ligand Into a New Coordination Network Promoted by ClO4–Aromatic‐π Interactions
Authors: Banerjee Priyabrata , Jana Atish Dipankar , Mostafa Golam , Goswami Sreebrata 
Published: November 2007

AbstractA unique supramolecular network of the trimetallic building unit [(bpy)2Ru(LO)Na(LO)Ru(bpy)2](ClO4)5·3H2O {bpy = 2,2′‐bipyridine, LO = 7‐methoxy‐5‐(4‐methoxyphenyl)‐2,3‐bis(4‐methoxyphenylimino)‐3,5‐dihydro‐2H‐phenazin‐1‐one} is described. Crystal growth is driven by several synergistic intermolecular interactions including ClO4–π, π–π, C–H···π and hydrogen bonding. Optical properties of the supramolecule are modified due to aggregation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Bridged Dinuclear Tripodal Tris(amido)phosphane Complexes of Titanium and Zirconium as Diligating Building Blocks for Organometallic Polymers
Authors: Han Hua , Johnson Samuel A. 
Published: November 2007

AbstractAppropriate bridging ligands allow for the preparation of bimetallic titanium and zirconium precursors to transition‐metal‐containing polymers using the formally trianionic P(CH2NArR)3 ligand (where ArR = Ph, and 3,5‐Me2C6H3 for a and b, respectively). Lithiation of the known amidophosphane ligand precursors P(CH2NHArR)3 (1a,b) with 3 equiv. of nBuLi cleanly provided the diethyl ether adducts P(CH2NArR)3Li3(OEt2)1.5 (2a,b). The THF adduct P(CH2NPh)3Li3(THF)5 (2a‐THF) was characterized by X‐ray crystallography. Protonolysis reactions were used to prepare the mononuclear titanium complexes P(CH2NArR)3TiOC6H4tBu (4a,b) and dinuclear species [P(CH2NPh)3TiNMe2]2‐μ‐4,4′{O[3,3′,5,5′‐(C6H2Me2)2]O} (5a), [P(CH2NPh)3Ti]2(μ‐O) (6a), and P(CH2N‐3,5‐Me2C6H3)3Ti‐μ‐O‐Ti(NMe2)3 (7b), from P(CH2NArR)3TiNMe2. The reactions of 1a,b with Zr(NEt2)4 afforded metal complexes of the type P(CH2NArR)3ZrNEt2 (8a,b). The chloride complexes P(CH2NArR)3ZrCl(THF) (9a,b) were prepared by treatment of HNEt3Cl with 1 or 2. The complexes 9a,b reacted with cyclopentadienyllithium (C5H5Li) to produce P(CH2NArR)3ZrCp (10a,b), which were also prepared by the reactions of the lithium salts 2a,b with CpZrCl3. The dilithium salt of the fulvalene dianion (Li2C10H8) reacts with 9a,b to produce the dinuclear complexes trans‐[P(CH2NArR)3Zr]2(μ‐η5:η5‐C10H8) (10a,b), respectively. The facile preparation of transition‐metal‐containing polymers from the bridged dinuclear complexes was illustrated by the reaction of 6a with half an equivalent of [Rh(CO)2(μ‐Cl)]2, which precipitated polymeric Cl(CO)Rh[P(CH2NPh)3Ti]2(μ‐O). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Stereoselective Synthesis of (2S,4R)‐4‐Hydroxypipecolic Acid
Authors: Occhiato Ernesto G. , Scarpi Dina , Guarna Antonio 
Published: November 2007

AbstractA new synthetic route to enantiopure (2S,4R)‐4‐hydroxypipecolic acid from commercial ethyl (3S)‐4‐chloro‐3‐hydroxybutanoate is reported. The synthesis is based on the Pd‐catalyzed methoxycarbonylation of a 4‐alkoxy‐substituted δ‐valerolactam‐derived vinyl triflate followed by the stereocontrolled hydrogenation of the enamine double bond. The final product was obtained after exhaustive hydrolysis in 20 % yield over 10 steps. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Novel Electrochemical Microsensor for Hydrogen Peroxide based on Iron‐Ruthenium Hexacyanoferrate Modified Carbon Fiber Electrode
Authors: Pauliukaite Rasa , Hočevar Samo B. , Hutton Emily A. , Ogorevc Božidar 
Published: November 2007

AbstractNovel electrochemical microsensor based on mixed iron‐ruthenium hexacyanoferrate (FeRuHCF) modified carbon fiber microelectrode (CFME) is presented for voltammetric and amperometric measurement of hydrogen peroxide at physiological pH. The FeRuHCF coating was electrochemically deposited using a one step procedure onto the substrate carbon fiber microelectrode by cycling the potential between 0.0 and +1.0 V (vs. Ag/AgCl) in a solution containing all precursor salts. The microsensor displayed good stability in neutral and alkaline media and had a nonstop working lifetime of up to 12 hours. The amperometric response time varied from 5 to 15 s depending on the hydrogen peroxide concentration level. The newly developed electrochemical microsensor exhibited a highly linear behavior in the examined concentration range from 5 to 1000 μmol L−1 (R2=0.999), an LoD (3σ) of 0.9 μmol L−1, and a favorable reproducibility with a calculated RSD of 2.9% (n= 6) for 100 μmol L−1 hydrogen peroxide, thus holding great promise for its further application in real samples and its exploitation in combination with biorecognition elements in advanced microbiosensor design.
Fibroblast nemosis arrests growth and induces differentiation of human leukemia cells
Authors: Kankuri Esko , Babusikova Olga , Hlubinova Kristina , Salmenperä Pertteli , Boccaccio Carla , Lubitz Werner , Harjula Ari , Bizik Jozef 
Published: November 2007

AbstractInteractive signaling between cancer cells and stroma plays an important role in determining tumor development. We recently found tumor cell‐derived factors to induce fibroblast clustering, and that the high amounts of hepatocyte growth factor/scatter factor (HGF/SF) produced by these cell–cell contact‐activated fibroblasts enhanced the invasiveness of c‐Met‐expressing cancer cells. We now observed that leukemia cells lacking c‐Met respond to this novel type of fibroblast activation, nemosis, with growth arrest and differentiation to a dendritic cell‐like phenotype. This effect was counteracted by introduction of c‐Met expression into these cells. Moreover, those leukemia cell lines harboring properly processed c‐Met showed no effect in response to nemosis. We propose this effect to be mediated by nemosis‐derived cytokine signals, and present the potential candidates induced in the nemotic fibroblasts: interleukins‐1, ‐6, ‐8, ‐11, leukemia inhibitory factor and granulocyte‐macrophage‐colony‐stimulating factor. Our results emphasize the role of activated stromal fibroblasts in controlling progression of certain hematologic malignancies in a c‐Met expression‐dependent manner. © 2007 Wiley‐Liss, Inc.
Differences in antitumor effects of various statins on human pancreatic cancer
Authors: Gbelcová Helena , Leníček Martin , Zelenka Jaroslav , Knejzlík Zdeněk , Dvořáková Gabriela , Zadinová Marie , Poučková Pavla , Kudla Michal , Balaž Peter , Ruml Tomáš , Vítek Libor 
Published: November 2007

AbstractStatins are widely used for the treatment of hypercholesterolemia. However, their inhibitory action on HMG‐CoA reductase also results in the depletion of intermediate biosynthetic products, which importantly contribute to cell proliferation. The aim of the present study was to compare the effects of the individual commercially available statins on experimental pancreatic cancer. The in vitro effects of individual statins (pravastatin, atorvastatin, simvastatin, lovastatin, cerivastatin, rosuvastatin and fluvastatin) on the viability of human pancreatic cancer were evaluated in CAPAN‐2, BxPc‐3 and MiaPaCa‐2 cell lines. The in vivo experiments were performed on nude mice xenotransplanted with CAPAN‐2 cells. The mice received oral treatments either with a placebo, or with the statins mentioned earlier in a daily dose corresponding to a hypocholesterolemic dose in humans. The effect of these statins on the intracellular Ras protein, trafficking in MiaPaCa‐2 transfected cells, was also investigated. Substantial differences in the tumor‐suppressive effects of all statins were detected in both in vitro and in vivo experiments. While simvastatin exerted the highest tumor‐suppressive effects in vitro, rosuvastatin (p = 0.002), cerivastatin (p = 0.002) and fluvastatin (p = 0.009) were the most potent compounds in an animal model. All statins (except pravastatin) inhibited intracellular Ras protein translocation. In summary, substantial tumor‐suppressive effects of various statins on the progression of experimental pancreatic adenocarcinoma were demonstrated, with marked differences among individual statins. These results support greatly the potential of statins for the chemoadjuvant treatment of pancreatic cancer. © 2007 Wiley‐Liss, Inc.
Stabilization of cellular properties and differentiation mutilpotential of human mesenchymal stem cells transduced with hTERT gene in a long‐term culture
Authors: Huang Guoping , Zheng Qiang , Sun Jie , Guo Chunjuan , Yang Jinfeng , Chen Rui , Xu Yuling , Wang Guozhong , Shen Dan , Pan Zhijun , Jin Jie , Wang Jinfu 
Published: November 2007

AbstractHuman bone marrow mesenchymal stem cells (hMSCs) are promising candidates for cell therapy and tissue engineering. The life span of hMSCs during in vitro culture is limited. Human telomerase catalytic subunit (hTERT) gene transduction can prolong the life span of hMSCs and maintain their potential of osteogenic differentiation. We established a line of hMSCs transduced with exogenous hTERT (hTERT‐hMSCs) and investigated its sustaining cellular properties in a long‐term culture. This line of hTERT‐hMSCs was cultured for 290 population doublings (PDs) without loss of contact inhibition. Under adipogenic, chondrogenic and osteogenic induction, hTERT‐hMSCs at PD 95 and PD 275 could differentiate respectively into adipocytes, chondrocytes, and osteocytes. hTERT‐hMSCs at these PDs showed no transforming activity through both in vitro assay of cell growth in soft agar and in vivo assay of tumorigenicity in NOD‐SCID mice. Karyotype analyses showed no significant chromosomal abnormalities in hTERT‐hMSCs at these PDs. These results suggested that the hTERT‐hMSCs at lower population doubling levels (PDLs) should be considered as a cell model for studies of cellular senescence, differentiation and in vitro tissue engineering experiment because of its prolonged life span and normal cellular properties. J. Cell. Biochem. 103: 1256–1269, 2008. © 2007 Wiley‐Liss, Inc.
Lysophosphatidic acid in malignant ascites stimulates migration of human mesenchymal stem cells
Authors: Lee Mi Jeong , Jeon Eun Su , Lee Jung Sub , Cho Mong , Suh Dong‐Soo , Chang Chulhun L. , Kim Jae Ho 
Published: November 2007

AbstractLysophosphatidic acid (LPA) is elevated in ascites of ovarian cancer patients and is involved in growth and invasion of ovarian cancer cells. Accumulating evidence suggests a pivotal role of mesenchymal stem cells (MSCs) or stromal cells in tumorigenesis. In the present study, we demonstrated that ascites from ovarian cancer patients and LPA increased migration of human MSCs. The migration of MSCs induced by LPA and malignant ascites was completely abrogated by pretreatment with Ki16425, an antagonist of LPA receptors, and by silencing of endogenous LPA1, but not LPA2, with small interference RNA, suggesting a key role of LPA played in the malignant ascites‐induced migration. LPA induced activation of ERK through pertussis toxin‐sensitive manner, and pretreatment of MSCs with U0126, a MEK inhibitor, or pertussis toxin attenuated the LPA‐induced migration. Moreover, LPA induced activation of RhoA in MSCs, and pretreatment of the cells with Y27632, a Rho kinase inhibitor, markedly inhibited the LPA‐induced migration. In addition, LPA and malignant ascites increased intracellular concentration of calcium in MSCs, and Ki16425 completely inhibited the elevation of intracellular calcium. These results suggest that LPA is a crucial component of the malignant ascites which induce the migration of MSCs and elevation of intracellular calcium. J. Cell. Biochem. 104: 499–510, 2008. © 2007 Wiley‐Liss, Inc.
Tweaking the hinge and caps: testing a model of the organization of jaws
Authors: Depew Michael J. , Compagnucci Claudia 
Published: November 2007

AbstractHistorically, examinations of gnathostome skulls have indicated that for essentially the entirety of their existence, jaws have been characterized by a high degree of fidelity to an initial basic structural design that will then go on to manifest an amazing array of end‐point phenotypes. These two traits—bauplan fidelity and elaboration of design—are inter‐connected and striking, and beg a number of questions, including: Are all jaws made in the same manner and if not how not? To begin to tackle such questions, we herein operationally define jaws as two appositional, hinged cranial units for which polarity and potential modularity are characteristics, and then address what is necessary for them to form, including delineating both the sources of cells and tissues that will formally yield the jaws as well as what informs their ontogeny (e.g., sources of positional information and factors directing the interpretation of developmental cues). Following on this, we briefly describe a predictive, testable model of jaw development (the “Hinge and Caps” model) and present evidence that theSatb2+cell population in the developing jaw primordia of mice defines a developmentally and evolutionarily significant jaw module such as would be predicted by the model.J. Exp. Zool. (Mol. Dev. Evol.) 310B:315–335, 2008. © 2007 Wiley‐Liss, Inc.
Sequence‐specific inhibition of RNA polymerase III‐dependent transcription using Zorro locked nucleic acid (LNA)
Authors: Ge Rongbin , Svahn Mathias G. , Simonson Oscar E. , Mohamed Abdalla J. , Lundin Karin E. , Smith C. I. Edvard 
Published: November 2007

AbstractBackgroundRNA polymerase III (pol III)‐dependent transcripts are involved in many fundamental activities in a cell, such as splicing and protein synthesis. They also regulate cell growth and influence tumor formation. During recent years vector‐based systems for expression of short hairpin (sh) RNA under the control of a pol III promoter have been developed as gene‐based medicines. Therefore, there is an increasing interest in means to regulate pol III‐dependent transcription. Recently, we have developed a novel anti‐gene molecule ‘Zorro LNA (Locked Nucleic Acid)’, which simultaneously hybridizes to both strands of super‐coiled DNA and potently inhibits RNA polymerase II‐derived transcription. We have now applied Zorro LNA in an attempt to also control U6 promoter‐driven expression of shRNA.MethodsIn this study, we constructed pshluc and pshluc2BS plasmids, in which U6 promoter‐driven small hairpin RNA specific for luciferase gene (shluc) was without or with Zorro LNA binding sites, respectively. After hybridization of Zorro LNA to pshluc2BS, the LNA‐bound plasmid was cotransfected with pEGFPluc into mammalian cells and into a mouse model. In cellular experiments, cotransfection of unhybridized pshluc2BS, Zorro LNA and pEGFPluc was also performed.ResultsThe results showed that the Zorro LNA construct efficiently inhibited pol III‐dependent transcription as an anti‐gene reagent in a cellular context, including in vivo in a mouse model.ConclusionsThus, this new form of gene silencer ‘Zorro LNA’ could potentially serve as a versatile regulator of pol III‐dependent transcription, including various forms of shRNAs. Copyright © 2007 John Wiley & Sons, Ltd.
The teacher as leader: The relationship between emotional intelligence and leadership effectiveness, commitment, and satisfaction
Authors: Iordanoglou Dimitra 
Published: November 2007

AbstractEmotional intelligence has emerged in the past decade as one of the crucial components of leadership effectiveness in many different contexts. The present study aimed at examining the relationships among emotional intelligence, leadership effectiveness, commitment, and satisfaction in education. Three hundred thirty‐two primary education teachers participated in the study conducted in Greece. Results, using structural equation modeling, showed that emotional intelligence, especially the intrapersonal and interpersonal dimensions, has a positive effect on leadership roles, explaining 51% of variance. A strong positive effect was also apparent on teachers' commitment and effectiveness, as measured by teachers' perception. Leadership roles such as performance evaluation, motivation support, and development improvement had a strong influence on effectiveness. The findings could have implications for the selection and training of future educators.
Sealing of open dentinal tubules by laser irradiation: AFM and SEM observations of dentine surfaces
Authors: Kubínek Roman , Zapletalová Zdenka , Vůjtek Milan , Novotný Radko , Kolářová Hana , Chmelíčková Hana , Peřina Jan 
Published: November 2007

AbstractDentin of human teeth is a vital hydrated tissue. It is strongly sensitive to dehydration and drying that are commonly used in preparation of samples for scanning electron microscopy. Experience in examination of dentine surfaces of extracted human third molars using contact mode atomic force microscopy under moist conditions is described. The examined dentine surfaces are modified by laser radiation produced by a pulsed Nd:YAG laser that leads to sealing of open dentinal tubules under suitable conditions that are reached after covering dentine surfaces with dye agents. Out of four investigated dye agents erythrosin solution in water has been found the most suitable and the lower and upper limits of pulse energies for sealing of dentinal tubules have been set. Copyright © 2007 John Wiley & Sons, Ltd.
Erratum: Engineering a circularly permuted GFP scaffold for peptide presentation
Authors: Paschke Matthias , Tiede Christian , Höhne Wolfgang 
Published: November 2007

AbstractEngineering a circularly permuted GFP scaffold for peptide presentationMatthias Paschke, Christian Tiede, Wolfgang Höhne.Volume 20, Issue 5, Pages 367–378 (September/October 2007) DOI: 10.1002/jmr.844.The above paper was published with an incorrect affiliation of the co‐authors. The correct address is as follows:Institut für Biochemie, Charité‐Universitätsmedizin Berlin, Monbijoustrasse 2a, D‐10117 Berlin, Germany
Evaluation of the Physical‐Chemical Properties of Poly(ethylene oxide)‐block‐Poly(propylene oxide) by Different Characterization Techniques
Authors: Mansur Claudia , Spinelli Luciana , González Gaspar , Lucas Elizabete F. 
Published: November 2007

AbstractSummary: A surfactant's efficiency for a given application is dependent on its chemical structure and physical‐chemical properties in solution, including surfactant solubility as a function of concentration and temperature as well as adsorption and aggregation behavior. This review work describes the main physical‐chemical properties ascertained by means of various characterization techniques, which can be used to study nonionic surfactants based on poly(ethylene oxide)‐block‐poly(propylene oxide) (PEO‐PPO). Among these, some are widely used and others are relatively new for this type of application.