bluuebunny/crossref_metadata_2025_split huggingface dataset:
On self‐immersions of infinite graphs
Authors: Andreae Thomas 
Published: May 2008

AbstractThe existence of an infinite graph which is not isomorphic to a proper minor of itself was proved by Oporowski. In the present note, it is shown that an analogous result holds when immersions are considered instead of minors. The question whether or not the same is true for weak immersions remains open. © 2008 Wiley Periodicals, Inc. J Graph Theory 58: 275–285, 2008
Estimating the net effects of migration and remittances on poverty and inequality: comparison of Fiji and Tonga
Authors: Brown Richard P.C. , Jimenez Eliana 
Published: April 2008

AbstractWe use original 2005 household survey data from Fiji and Tonga to estimate the impact of migration and remittances on income distribution and measures of poverty. Measures of inequality and poverty based on observed, with‐migration income and remittances are then compared with those based on two without‐migration and remittances scenarios; one in which remittances are treated simplistically as an exogenous addition to household income, and another in which counterfactual household incomes are estimated, taking account of what the migrant members would have earned had they not migrated. The estimated effects of remittances on poverty alleviation were found to be stronger when the more rigorous, counterfactual income estimates are used, but their effect on income inequality was found to be ambiguous. The extent to which migration and remittances alleviate poverty was also found to be more substantial in Tonga, the country with a much longer migration history and higher remittance dependence. Copyright © 2008 John Wiley & Sons, Ltd.
Introduction to the special issue: to prosper, organizational psychology should…
Authors: Greenberg Jerald 
Published: April 2008

AbstractThis special issue showcases papers by four sets of authors who share opinions about specific things that should be done for the field of organizational psychology to prosper. To begin, Lefkowitz argues that practitioners should embrace a more humanistic set of values. Second, Cascio suggests that the field's success requires integrating the contributions of scientists and practitioners. Third, Edwards identifies 10 key methodological limitations that must be overcome in organizational psychology research. Finally, Gelfand and her associates opine that to prosper, the field's theories and research must embrace a more global perspective. Concluding, Porter comments on what these papers suggest about the present status of the field and offers opinions on where the field appears to be—and should be—going. Copyright © 2008 John Wiley & Sons, Ltd.
To prosper, organizational psychology should… bridge application and scholarship
Authors: Cascio Wayne F. 
Published: April 2008

AbstractAcademics and practitioners differ on so many dimensions that researchers have described them as living in different “thought worlds.” That gap persists, and there are important explanations for it, but a confluence of economic and organizational forces is driving academics and practitioners toward each other. To date, much of the effort by academics to reach out to practitioners has focused on the diffusion of scientific knowledge, not its creation. This paper explores several promising strategies for improving both the bidirectional diffusion of knowledge as well as its creation. It argues that for genuine change to occur, it is necessary to modify academic reward systems and to promote much closer collaboration between academics and practitioners. Copyright © 2008 John Wiley & Sons, Ltd.
Organizational psychology: a look backward, outward, and forward
Authors: Porter Lyman W. 
Published: April 2008

AbstractThis paper provides a commentary on selected issues and topics in the four papers included in this special issue of the journal (those by Lefkowitz, Cascio, Edwards, and Gelfand et al.). To put the contents of the four papers in context, the past development of the field of organizational psychology is first briefly reviewed, followed by a discussion of its relationship to adjacent “cousin” fields. Comments are then presented on each of the four papers. The paper concludes with an examination of several questions: Has the field of organizational psychology made progress over the past 50+ years? Has the field been sufficiently introspective about itself and its scholarly efforts and values? How does the field of organizational psychology compare—in terms of the issues raised in the four papers—to other fields? And, finally, what will be being said about the field of organizational psychology 20 years from now? Copyright © 2008 John Wiley & Sons, Ltd.
Study of pepsin phosphorylation using immobilized metal affinity chromatography
Authors: Novotna Lenka , Hruby Martin , Benes Milan J. , Kucerova Zdenka 
Published: April 2008

AbstractThe interactions of pepsin with immobilized trivalent metal ions and the participation of the enzyme phosphate group in this process were investigated using high performance immobilized metal affinity chromatography. Two different sorbents were used: the newly prepared one, consisting of Ga3+ chelate of (6‐amino‐1‐hydroxyhexane‐1,1‐diyl) bis(phosphonic acid) covalently bound to a methacrylate support (BP‐Ga3+), and the commercial one, containing immobilized Fe3+ ions (POROS MC20‐Fe3+). The comparison of the behavior of porcine pepsin A and its partially dephosphorylated form on both sorbents showed that both forms of pepsin were adsorbed under the same conditions. To eliminate the participation of free carboxyl groups in pepsin adsorption, both enzyme forms were modified by amidation or esterification. Native enzyme and its partially dephosphorylated form both with modified carboxyl groups differed in their interaction with immobilized Ga3+ and Fe3+. Phosphorylated pepsin molecules with esterified carboxyl groups were adsorbed on both sorbents while nonphosphorylated ones with esterified carboxyl groups were not adsorbed.
Using ancient DNA analysis in palaeopathology: a critical analysis of published papers, with recommendations for future work
Authors: Roberts C. , Ingham S. 
Published: May 2008

AbstractDespite an observable increase in the number of studies using ancient DNA analysis to diagnose disease in human remains, there remain issues to be addressed about the quality of the resulting publications. This paper describes the qualitative analysis of published papers that describe the detection of pathogenic DNA in human skeletal and mummified remains from archaeological sites. Its ultimate goal is to provide an overview of the main problematic issues in relationship to standards developed in molecular biology and to make recommendations for future work. Sixty‐five papers published between 1993 and 2006 were surveyed and the quality of each was assessed using 15 criteria. Interesting results emerged. Of particular note was the high number of papers that did not acknowledge the use of even basic contamination control (90%) or procedures to validate results independently (85%). This study illustrates that attention to contamination control and authentication of results is needed in future research, if confidence in aDNA analysis in palaeopathology is to be increased. Additionally, methods of analysis must be described in published papers to ensure transparency in processes utilised to generate the data. Copyright © 2008 John Wiley & Sons, Ltd.
Development and research for applying innovative magnetic soft mold imprinting techniques in microstructure component manufacturing
Authors: Weng Y.‐J. , Weng Y.‐C. , Yang S.‐Y. 
Published: May 2008

AbstractThe present study employs an innovative technique, which uses PDMS soft mold, blended with magnetic powder as the transmission and imprinting methods, and integrates features from soft micromolding PMMA, an electro‐magnetically controlled, well‐proportioned, pressing technique in order to study how to create microlens arrays through a magnetic soft mold imprinting resist technique. Thus, it renders nanometer imprinting applications, and its technology, more developed and mature. The research findings revealed that, PDMS, blended with magnetic powder, can accurately recast and duplicate nanometer microstructures. Under well‐proportioned magnetic pressing, controlled by an electro‐magnetic disk, it can effectively fill and shape resist microstructures. The composite material of PDMS, with added magnetic iron powder, can effectively improve mechanical strength properties of pure PDMS soft mold, which is easily transformed for imprinting. Meanwhile, owing to the unique features of PDMS soft mold, conformal contact with the base material is possible; therefore, the effective imprinting area and the duplicated representation are significantly improved. In addition, as magnetic PDMS soft mold is easily produced and fast in recasting, the costs can be effectively reduced. In addition, due to features such as low surface free energy and a tendency not to stick to resist in imprinting, the soft mold is evenly controlled by the electro‐magnetic disk for imprinting duplication, highlighting the advantages of microstructure imprinting procedures. Copyright © 2008 John Wiley & Sons, Ltd.
Stereoisomeric effect on in vitro drug release from injectable poly(lactic acid co castor oil) polyesters
Authors: Sokolsky‐Papkov Marina , Domb Abraham J. 
Published: May 2008

AbstractA systematic study on the influence of lactic acid (LA) conformation on polyester properties, degradation, and drug release profiles is reported. Copolyesters based on L‐ or DL‐LA and castor oil (CO) (triglyceride of ricinoleic acid (RA)) were synthesized by melt condensation. Two feed ratios of LA to CO were used. Copolymers with feed ratio of 60:40 and 50:50 LA to CO were synthesized. P(LA/CO)s 60:40 and 50:50 had weight average molecular weights (Mw) of 4700 and 3700, respectively. All polymers are viscous liquids at room temperature. Copolymer composition and LA conformation had direct effect on polymer properties, degradation rate, and drug release profile. Increase in CO content (hydrophobisity) decreased the degradation and release rates of the polymers. Effect of sample size was also different for all polymers. Choosing polymer composition and LA conformation it is possible to choose desired release profile for the tested drug. Copyright © 2008 John Wiley & Sons, Ltd.
Simultaneous determination of eight bioactive alkaloids in Corydalis saxicola by high‐performance liquid chromatography coupled with diode array detection
Authors: Cheng Xuanxuan , Wang Dongmei , Jiang Lin , Yang Depo 
Published: April 2008

AbstractCorydalis saxicola Bunting (Papaveraceae), a traditional folk medicine, has been used to treat hepatic diseases for a long time. Owing to its signicant clinical effectiveness against hepatitis, cirrhosis and hepatoma, C. saxicola and its preparation are widely applied. In this study, eight alkaloids, namely isocorydine, scoulerine, dehydrocheilanthifoline, dehydrodiscretamine, dehydroisoapocavidine, dehydrocavidine, palmatine and berberine, which have been previously proven to possess potential antitumour activity, were selected as the chemical markers of C. saxicola. To evaluate the quality of C. saxicola, a simple, accurate and reliable HPLC‐DAD method was developed for the simultaneous determination of the above eight compounds. Separation was achieved on a GeminiTM C18 column (5 µm, 250 × 4.6 mm i.d., Phenomenex Inc., CA, USA) with a gradient solvent system of 20 mm aqueous ammonium acetate–acetonitrile, at a flow‐rate of 1.0 mL/min and detected at 270 and 280nm. All eight calibration curves showed good linearity (R2 > 0.9992). The method was reproducible with intra‐ and inter‐day variations of less than 5%. The recovery was in the range of 96.09–102.80%. This assay was successfully utilised to quantify the eight alkaloids in C. saxicola from different locations. The results demonstrated that this method is simple, reliable and suitable for the quality control of this medicinal herb. Copyright © 2008 John Wiley & Sons, Ltd.
Fingerprint of Hedyotis diffusa Willd. by HPLC‐MS
Authors: Yang Ting , Yang Yi‐Hua , Yang Ju‐Yun , Chen Ben‐Mei , Duan Ju‐Ping , Yu Shu‐Yi , Ouyang Hong‐Tao , Cheng Jun‐Ping , Chen Yu‐Xiang 
Published: April 2008

AbstractA HPLC‐MS fingerprint method has been developed based on the consistent chromatographic features of the major chemical constituents among 10 batches of Hedyotis diffusa Willd. Chromatographic separation was conducted on a Hypersil‐Keystone Hypurity C18 column using methanol:water:acetic acid as the mobile phase. Major compounds, including oleanolic acid, ursolic acid and ferulic acid, were analysed by HPLC‐MS. Their analysis was ascertained by comparison with data derived from the standard compounds. The HPLC‐MS fingerprint was successfully applied to analyse and differentiate samples from different geographical origins, or processing methods. H. diffusa was well distinguished from Hedyotis chrysotricha by HPLC‐MS. Therefore the establishment of fingerprint of H. diffusa is critical in assessing and controlling its overall quality. Copyright © 2008 John Wiley & Sons, Ltd.
Warum Sandburgen bauen einfach ist
Authors: Herminghaus Stephan 
Published: April 2008

AbstractTrockene Granulate wie Wüstensand haben mit Flüssigkeiten vieles gemein. So rinnt der Sand im Stundenglas mühelos durch die dünne Engstelle. Sobald man aber eine gewöhnliche Flüssigkeit wie Wasser in das Granulat hineinmischt, nimmt dieses eine steife Konsistenz an – stabil genug, um als Baumaterial für Sandburgen zu dienen. Erstaunlicherweise ist die Steifigkeit des feuchten Granulats weitgehend unabhängig vom Wassergehalt. Den Grund hierfür fand jetzt ein internationales Forscherteam um Stephan Herminghaus vom Max‐Planck‐Institut für Dynamik und Selbstorganisation in Göttingen heraus.
Die Welt im Tröpfchen
Authors: Schlichting H.‐Joachim 
Published: April 2008

AbstractAuch feucht‐regnerische Tage können Ihren Reiz haben. Zum Beispiel dann, wenn sie auf Fensterscheiben Wassertropfen entstehen lassen, die die Umwelt abbilden – was man freilich erst bei genauem Hinsehen entdeckt.
Zinc adaptation and resistance to cadmium toxicity in mammalian cells: Molecular insight by proteomic analysis
Authors: Rousselet Estelle , Martelli Alain , Chevallet Mireille , Diemer Hélène , Van Dorsselaer Alain , Rabilloud Thierry , Moulis Jean‐Marc 
Published: May 2008

AbstractTo identify proteins involved in cellular adaptive responses to zinc, a comparative proteome analysis between a previously developed high zinc‐ and cadmium‐resistant human epithelial cell line (high zinc‐resistant HeLa cells, HZR) and the parental HeLa cells has been carried out. Differentially produced proteins included cochaperones, proteins associated with oxido‐reductase activities, and ubiquitin. Biochemical pathways to which these proteins belong were probed for their involvement in the resistance of both cell lines against cadmium toxicity. Among ER stressors, thapsigargin sensitized HZR cells, but not HeLa cells, to cadmium toxicity more acutely than tunicamycin, implying that these cells heavily relied on proper intracellular calcium distribution. The similar sensitivity of both HeLa and HZR cells to inhibitors of the proteasome, such as MG‐132 or lactacystin, excluded improved proteasome activity as a mechanism associated with zinc adaptation of HZR cells. The enzyme 4‐hydroxyphenylpyruvate dioxygenase (HPPD) was overproduced in HZR cells as compared to HeLa cells. It transforms HPP to homogentisate in the second step of tyrosine catabolism. Inhibition of HPPD decreased the resistance of HZR cells against cadmium, but not that of HeLa cells, suggesting that adaptation to zinc overload and increased HPP removal are linked in HZR cells.
Mass spectrometric characterization of mitochondrial complex I NDUFA10 variants
Authors: Muñoz Javier , Fernández‐Irigoyen Joaquín , Santamaría Enrique , Parbel Axel , Obeso José , Corrales Fernando J. 
Published: April 2008

AbstractIn the present study, we have used a combination of 2‐DE and MS to isolate and characterize two variants of the mitochondrial complex I subunit NDUFA10 from Wistar rat brain. Extensive MS/MS analysis revealed that a D/N substitution at position 120 resulting from a 353A/G transition in the coding gene is the biochemical difference between the two most abundant NDUFA10 isoforms. Moreover, 33 modifications of distinct chemical nature targeting 59 specific residues were found to be common to the acidic and basic forms. Positions C67, H149 and H322 of NDUFA10 were specially targeted by different modifications suggesting the high reactivity of these residues and their potential implication in the regulation of the protein function. Together with nonenzymatic modifications that can form in the sample isolation and workup steps, such as oxidation of methionine, tryptophan, cysteine and histidine, we describe amino acid variants of unknown chemical structure that must be further characterized, as well as accumulation of R, K and H methylations and probably K acetylations at the C‐terminal region that might play a role in the control of NDUFA10 activity according to similar mechanisms to those described for histones.
Kinetics and mechanisms of gas‐phase elimination of 2,2‐diethoxyethyl amine and 2,2‐diethoxy‐N,N‐diethylethanamine
Authors: Mora José R. , Domínguez Rosa M. , Herize Armando , Tosta María , Chuchani Gabriel 
Published: April 2008

AbstractThe gas‐phase elimination kinetics of 2,2‐diethoxyethyl amine and 2,2‐diethoxy‐N,N‐diethylethanamine (320–380 °C; 40–150 Torr) in a seasoned reaction vessel are homogeneous, unimolecular and obey a first‐order rate law. These elimination processes involve two parallel reactions. The first gives ethanol and the corresponding 2‐ethoxyethenamine. The latter compound further decomposes to ethylene, CO and the corresponding amine. The second parallel reaction produce ethane and the corresponding ethyl ester of an α‐amino acid. The following Arrhenius expressions are given as:For 2,2‐diethoxyethyl amine

For 2,2‐diethoxy‐N,N‐diethylethanamine

Comparative kinetic and thermodynamic parameters of the overall, the parallel and the consecutive reactions lead to consider two types of mechanisms in terms of a concerted polar cyclic transition state structures. Copyright © 2008 John Wiley & Sons, Ltd.
Hexacyclo[7.1.0.01,3.03,5.05,7.07,9]decane, or pentagramane: high‐level computational studies on a novel hydrocarbon
Authors: Ball David W. 
Published: April 2008

AbstractA novel hydrocarbon whose line diagram is that of the classic pentagram is described. High‐level computational studies have been performed to determine its structure, vibrational frequencies, NMR spectra, and thermochemistry. Copyright © 2008 John Wiley & Sons, Ltd.
Gas‐phase reactions of Cl atoms with hydrochloroethers: relative rate constants and their correlation with substituents' electronegativities
Authors: Dalmasso Pablo R. , Taccone Raúl A. , Nieto Jorge D. , Cometto Pablo M. , Lane Silvia I. 
Published: April 2008

AbstractRate constants for the reactions of Cl atoms with CH3OCHCl2 and CH3OCH2CH2Cl were determined at (296 ± 2) K and atmospheric pressure using synthetic air as bath gas. Decay rates of these organic compounds were measured relative to the following reference compounds: CH2ClCH2Cl and n‐C5H12. Using rate constants of 1.33 × 10−12 and 2.52 × 10−10 cm3 molecule−1 sec−1 for the reaction of Cl atoms with CH2ClCH2Cl and n‐C5H12, respectively, the following rate coefficients were derived: k(Cl + CH3OCHCl2) = (1.05 ± 0.11) × 10−12 and k(Cl + CH3OCH2CH2Cl) =  (1.14 ± 0.10) × 10−10, in units of cm3 molecule−1 s−1. The rate constants obtained were compared with previous literature data and a correlation was found between the rate coefficients of some CH3OCHR1R2 + Cl reactions and ΔElectronegativity of CHR1R2. Copyright © 2008 John Wiley & Sons, Ltd.
The nature of electron transitions in anionic dioxaborines, derivatives of aminocoumarin
Authors: Gerasov A. O. , Shandura M. P. , Kovtun Yu. P. , Kachkovsky A. D. 
Published: April 2008

AbstractCombined quantum‐chemical and spectral studies of the features of electron transitions and absorption spectra of symmetrical and unsymmetrical polymethine dyes, derivatives of aminocoumarin, have been performed. It was established that the lowest two electron transitions are splitting transitions, involving solitonic level and two low positioned acceptor levels, in contrast to the cationic cyanine dyes, where two lowest transitions are connected with two splitting donor levels and solitonic level. The considerable interaction between two acceptor levels in symmetrical dyes provides an additional decrease of the first transition energy and hence leads to the relatively deep and intensive color, whereas the second transition with its negligible oscillator strength is practically unobserved. The higher electron transitions involve orbitals located mainly at the coumarin residue; the corresponding spectral bands appear in the short‐wavelength region. Introduction of dialkylamino group in coumarin heterocycle shifts bathochromically the long‐wavelength absorption band and considerably increases the intensity of S0 → S1 and S0 → S3 electron transitions. Copyright © 2008 John Wiley & Sons, Ltd.
Epitaxy of softly deposited small Co nanoclusters on Cu(001) surfaces
Authors: Jiménez‐Sáez J. C. , Pérez‐Martín A. M. C. , Jiménez‐Rodríguez J. J. 
Published: May 2008

AbstractSoft deposition of Co nanoclusters on a Cu(001) substrate is studied by constant‐temperature molecular‐dynamics simulations. A different epitaxial behaviour of the clusters has been found as a function of the number of atoms. At room temperature, Co clusters grow epitaxially below two hundred atoms. Some of these clusters show stacking faults. Larger clusters do not achieve epitaxy. In these clusters, influence of the substrate is small and only affects the zone nearest to the interface, which becomes epitaxial. By increasing temperature and deposition energy, it is possible to enlarge the parts of the cluster grown epitaxially even attaining a complete epitaxy. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Nano‐scale shear mode testing of the adhesion of nanoparticles to a surface‐support
Authors: Munz M. , Cox D. C. , Cumpson P. J. 
Published: May 2008

AbstractUsing atomic force microscopy (AFM/SFM), the strength of the adhesion between nanoparticles (NPs) and a flat gold surface was studied. By scanning in contact mode, a lateral force was applied to the NPs, depending on the cantilever stiffness and the setpoint value of the topography feedback. In this way, a threshold force for NP detachment was determined. The sample under investigation consisted of arrays of tungsten NPs deposited on top of a flat gold surface. The NPs were generated using electron beam deposition (EBD) and the precursor gas W(CO)6. Owing to the array‐wise arrangement of the NPs, any change in their position was comparatively easy to detect by deviation from the array points. The beam dwell time was employed as a parameter to control the NP size. The force threshold value for particle detachment was found to increase with the beam dwell time. Loose NPs moved by the scanning tip displayed increased lateral forces. These appeared in the lateral force images as continuous tracks. After expansion of the scan area such tracks were seen to mostly originate from the edges of the previous scans where the NPs had piled up. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)