bluuebunny/crossref_metadata_2025_split huggingface dataset:
Self‐assembly of π‐conjugated bis(terpyridine) ligands with zinc(II) ions: New metallosupramolecular materials for optoelectronic applications
Authors: Winter Andreas , Friebe Christian , Chiper Manuela , Hager Martin D. , Schubert Ulrich S. 
Published: July 2009

AbstractA series of main‐chain metallopolymers (P1–P10) was prepared by the self‐assembly of rigid‐linear π‐conjugated bis(terpyridine) monomers (1–10) with ZnIIions and was fully characterized. The polymerization was additionally confirmed by UV/vis titration experiments. A strong increase in viscosities (around 1.6 times) relative to those of the monomer solutions was found. The thermal stability ofP1–P10compared with that of1–10was enhanced as a result of the metallopolymerization. The electro‐optical properties of the materials were investigated in detail. Tuning of the electrochemical and photophysical properties was enabled; thus, bright purple to green photoluminescent (PL) emission (PL quantum yields of 0.12–0.81) forP1–P10was observed in solution with the emission color strongly depending on the nature of the π‐conjugated bis(terpyridine) system. Thin homogeneous films ofP6were prepared by solution processing, that is, spin‐coating and inkjet‐printing, and exhibited intense yellow PL emission in the solid state. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4083–4098, 2009
Morphological transitions in aggregates of thermosensitive poly(ethylene oxide)‐b‐poly(N‐isopropylacrylamide) block copolymers prepared via RAFT polymerization
Authors: Zhao Junpeng , Zhang Guangzhao , Pispas Stergios 
Published: July 2009

AbstractDouble hydrophilic poly(ethylene oxide)‐b‐poly(N‐isopropylacrylamide) (PEO‐b‐PNIPAM) block copolymers were synthesized via reversible addition‐fragmentation chain transfer (RAFT) polymerization, using a PEO‐based chain transfer agent (PEO‐CTA). The molecular structures of the copolymers were designed to be asymmetric with a short PEO block and long PNIPAM blocks. Temperature‐induced aggregation behavior of the block copolymers in dilute aqueous solutions was systematically investigated by a combination of static and dynamic light scattering. The effects of copolymer composition, concentration (Cp), and heating rate on the size, aggregation number, and morphology of the aggregates formed at temperatures above the LCST were studied. In slow heating processes, the aggregates formed by the copolymer having the longest PNIPAM block, were found to have the same morphology (spherical “crew‐cut” micelles) within the full range of Cp. Nevertheless, for the copolymer having the shortest PNIPAM block, the morphology of the aggregates showed a great dependence on Cp. Elongation of the aggregates from spherical to ellipsoidal or even cylindrical was observed. Moreover, vesicles were observed at the highest Cp investigated. Fast heating leads to different characteristics of the aggregates, including lower sizes and aggregation numbers, higher densities, and different morphologies. Thermodynamic and kinetic mechanisms were proposed to interpret these observations, including the competition between PNIPAM intrachain collapse and interchain aggregation. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4099–4110, 2009
Barrier property enhancement of polyamide 6 by blending with a polyhydroxyamino‐ether resin
Authors: Eceolaza Sorkunde , Iriarte Marian , Uriarte Cristina , Etxeberria Agustin 
Published: July 2009

AbstractIn this work, the transport properties of the system formed by polyamide 6 (PA6) and polyhydroxyamino‐ether resin (PHAE) have been studied after characterizing the miscibility behavior. A single glass transition has been observed using differential scanning calorimetry that usually means total miscibility, but measurements by solid‐state cross‐polarization magic angle spinning NMR have shown that this system is only partially miscible, in good agreement with phase behavior reported before. Both carbon dioxide and water vapor transport properties of PA6/PHAE blends have been measured. For both penetrants, permeability coefficient shows an interesting negative deviation from the additive value, even the barrier character to carbon dioxide of pure PHAE is maintained up to 60 % in PA6 composition. Besides, PHAE reduces the plasticization effect of water in PA6. These improvements are very interesting for the PA 6 due to its wide use in packaging applications. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1625–1634, 2009
Posttraumatic stress disorder symptoms in cancer: psychometric analysis of the Spanish Posttraumatic Stress Disorder Checklist‐Civilian version
Authors: Costa‐Requena Gema , Gil Francisco 
Published: July 2009

AbstractObjective: The PTSD Checklist‐Civilian version (PCL‐C) was used as a screening tool to assess the presence of PTSD symptoms. The aim of this study was to explore the factorial structure of the Spanish version of the PCL‐C and calculate the correlation of PTSD symptoms with distress and health‐related quality of life.Method: The sample included 494 cancer outpatients. In order to validate the PCL‐C, a principal component analysis was applied. The association between variable was measured by Pearson correlation.Results: Findings evidenced three symptoms clusters on the PCL‐C version, defined as Hyperarousal/Re‐experiencing, Numbing and Avoidance. About 10% of the total sample met clinical PTSD symptoms. In addition, PTSD symptoms were related negatively to health‐related quality of life and positively related with distress.Conclusion: The conceptualization of PTSD symptoms for cancer patients is supported by the specific symptom clusters identified on PCL‐C. Copyright © 2009 John Wiley & Sons, Ltd.
Profiling the potential biomarkers for cell differentiation of pancreatic cancer using iTRAQ and 2‐D LC‐MS/MS
Authors: Zhang Haijing , Lv Liyan , Liu Hui , Cui Lei , Chen Guoqiang , Bi Peixuan , Li Zhili 
Published: July 2009

AbstractPancreatic cancer is a highly lethal disease that is difficult to diagnose at early stage and even more difficult to cure. SW1990 and PANC‐1 represent the two cancer cell lines, which are both derived from pancreatic duct, but at different cell differentiation stages. In this study, we applied the iTRAQ‐labeling technology and 2‐D strong cation exchange/reversed phase liquid chromatography – LC‐MS/MS) to profile the secreted proteins of SW1990 and PANC‐1 cells in a conditioned cell culture medium. A total of 401 proteins were identified by MS/MS and protein database searching, the percentages of these proteins predicted in the categories of plasma membrane, intracellular and secreted proteins were 29.2, 32.7 and 38.2%, respectively. Fifty six proteins were identified with unknown functions and 19 proteins were quantified with significant level changes between the two cancer cell lines under the specific cell condition with 12 proteins being up‐regulated (>1.3‐fold change) in PANC‐1 (e.g. FLJ31222 protein, 97 kDa protein, type IV collagenase precursor, 38 kDa protein and centaurin) and seven proteins being up‐regulated in SW1990 (e.g. fibroblast growth factor receptor substrate 2, putative p150, hypothetical protein LOC 654463 and LOC 55701). The proteins with significant level changes may provide a baseline to investigate mechanisms underlying the differentiation of two cell lines and can be further screened for better protein biomarkers in pancreatic cancer.
Activity‐based mass spectrometric characterization of proteases and inhibitors in human saliva
Authors: Sun Xiuli , Salih Erdjan , Oppenheim Frank G. , Helmerhorst Eva J. 
Published: July 2009

AbstractProteases present in oral fluid effectively modulate the structure and function of some salivary proteins and have been implicated in tissue destruction in oral disease. To identify the proteases operating in the oral environment, proteins in pooled whole saliva supernatant were separated by anion‐exchange chromatography and individual fractions were analyzed for proteolytic activity by zymography using salivary histatins as the enzyme substrates. Protein bands displaying proteolytic activity were particularly prominent in the 50–75 kDa region. Individual bands were excised, in‐gel trypsinized and subjected to LC/ESI‐MS/MS. The data obtained were searched against human, oral microbial and protease databases. A total of 13 proteases were identified all of which were of mammalian origin. Proteases detected in multiple fractions with cleavage specificities toward arginine and lysine residues, were lactotransferrin, kallikrein‐1, and human airway trypsin‐like protease. Unexpectedly, ten protease inhibitors were co‐identified suggesting they were associated with the proteases in the same fractions. The inhibitors found most frequently were alpha‐2‐macroglobulin‐like protein 1, alpha‐1‐antitrypsin, and leukocyte elastase inhibitor. Regulation of oral fluid proteolysis is highly important given that an inbalance in such activities has been correlated to a variety of pathological conditions including oral cancer.
Analyses on hydrophobicity and attractiveness of all‐atom distance‐dependent potentials
Authors: Shirota Matsuyuki , Ishida Takashi , Kinoshita Kengo 
Published: July 2009

AbstractAccurate model evaluation is a crucial step in protein structure prediction. For this purpose, statistical potentials, which evaluate a model structure based on the observed atomic distance frequencies in comparison with those in reference states, have been widely used. The reference state is a virtual state where all of the atomic interactions are turned off, and it provides a standard to measure the observed frequencies. In this study, we examined seven all‐atom distance‐dependent potentials with different reference states. As results, we observed that the variations of atom pair composition and those of distance distributions in the reference states produced systematic changes in the hydrophobic and attractive characteristics of the potentials. The performance evaluations with the CASP7 structures indicated that the preference of hydrophobic interactions improved the correlation between the energy and the GDT‐TS score, but decreased the Z‐score of the native structure. The attractiveness of potential improved both the correlation and Z‐score for template‐based modeling targets, but the benefit was smaller in free modeling targets. These results indicated that the performances of the potentials were more strongly influenced by their characteristics than by the accuracy of the definitions of the reference states.
Testing and improving the effectiveness of trap crops for management of the diamondback moth Plutella xylostella (L.): a laboratory‐based study
Authors: George David R , Collier Rosemary , Port Gordon 
Published: July 2009

AbstractBACKGROUND: The aim of this study was to assess white mustard (Sinapis alba L.) as a trap crop for diamondback moth [Plutella xylostella (L.)] on cauliflower [Brassica oleracea (L.) var. Lateman]. Moth behaviour on these plants and the importance of plant age and size in maintaining pest preference for trap crop plants were also investigated.RESULTS: Three times as many eggs were laid on cauliflower plants that were unprotected than on plants protected by a trap crop of white mustard. Moths remained longer on the mustard plants as a result of a doubling in the mean duration of information‐providing behaviours. Plant age had little effect on P. xylostella host preference. When plant age was constant, percentage oviposition on mustard was higher when these were larger (93%) than copresented cauliflower plants, compared with when they were smaller (68%).CONCLUSION: Trap cropping with white mustard may reduce the incidence of P. xylostella in cauliflower crops. The pest management benefits of trap crops may be maximised by using trap crop plants that are larger than the main crop plants, although relatively smaller trap crop plants may still be preferred as hosts for P. xylostella per se. Copyright © 2009 Society of Chemical Industry
Treatment options for the management of parkinsonism
Authors: Metta Vinod , Davidson Colette , Iqbal Nausheen 
Published: July 2009

AbstractParkinson's disease is a disabling condition usually of later life for which there a variety of treatments. Our Drug review describes the symptoms and the properties of the available drugs, followed by a review of the prescription data and sources of further information. Copyright © 2009 Wiley Interface Ltd
Antimicrobial peptide interactions with silica bead supported bilayers and E. coli: buforin II, magainin II, and arenicin
Authors: Davis Ryan W. , Arango Dulce C. , Jones Howland D. T. , Van Benthem Mark H. , Haaland David M. , Brozik Susan M. , Sinclair Michael B. 
Published: July 2009

AbstractUsing the unique quantitative capabilities of hyperspectral confocal microscopy combined with multivariate curve resolution, a comparative approach was employed to gain a deeper understanding of the different types of interactions of antimicrobial peptides (AMPs) with biological membranes and cellular compartments. This approach allowed direct comparison of the dynamics and local effects of buforin II, magainin II, and arenicin with nanoporous silica bead supported bilayers and living E. coli. Correlating between experiments and comparing these responses have yielded several important discoveries for pursuing the underlying biophysics of bacteriocidal specificity and the connection between structure and function in various cellular environments. First, a novel fluorescence method for direct comparison of a model and living system is demonstrated by utilizing the membrane partitioning and environmental sensitivity of propidium iodide. Second, measurements are presented comparing the temporal dynamics and local equilibrium concentrations of the different antimicrobial agents in the membrane and internal matrix of the described systems. Finally, we discuss how the data lead to a deeper understanding of the roles of membrane penetration and permeabilization in the action of these AMPs. Copyright © 2009 European Peptide Society and John Wiley & Sons, Ltd.
Phonon spectroscopy of CdSe1–xTex nanocrystals grown in a borosilicate glass
Authors: Azhniuk Yu. M. , Hutych Yu. I. , Lopushansky V. V. , Prots L. A. , Gomonnai A. V. , Zahn D. R. T. 
Published: July 2009

AbstractPhonon spectra of CdSe1–x Tex nanocrystals grown in a borosilicate glass matrix, are studied by Raman spectroscopy. The experimental data are compared to those obtained by other authors for bulk and nanoscale CdSe1–x Tex. With the account of the factors specific for glass‐embedded nanocrystals, Raman spectroscopy is shown to be a reliable and non‐destructive method to evaluate the ternary nanocrystal composition. Raman measurements performed at different excitation wavelengths enabled the compositional dispersion of the nanocrystals to be estimated. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Quantitative method of the point defect concentration determination in Zn‐ and Cd‐doped HgTe using the far‐infrared spectroscopy
Authors: Cebulski J. , Sheregii E. M. , Polit J. , Marcelli A. , Piccinini M. , Kisiel A. , Kucherenko I. V. , Triboulet R. 
Published: July 2009

AbstractOur research is motivated in the first line by the necessity to have the total control of the vacancies which appear during the growth of mercury telluride crystals. As it is known, this material is very important for the IR devices. We present a non‐destructive method for quantitative determining the vacancy concentration in the lattice of Hg‐based semiconductor alloys with tetrahedral structure. The method is based on the identification of additional vibrational modes (AVM) induced by lattice deformations in the far infrared (FIR) reflectivity spectrum. Although the method is restricted by sensitivity limitations, recent FIR experimental data carried out on HgZnTe and HgCdTe samples containing Hg‐vacancies confirmed the presence of AVMs induced by Hg‐vacancies in as‐grown crystals. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Light polarized resonant Raman spectra from individual single‐ and double‐wall carbon nanotubes
Authors: Judek J. , Brunel D. , Mélin T. , Marczak M. , Zdrojek M. , Gebicki W. , Adamowicz L. 
Published: July 2009

AbstractMeasured light polarization dependent resonant Raman spectra from spatially isolated semiconducting single‐ and double‐wall carbon nanotubes are reported. Most of the observed modes intensities exhibit two or fourfold symmetry, for VV and VH configuration, respectively. Weak quantitative changes in the G bands have been observed suggesting different subbands transitions Evμ→Ecμ contribution. Model explaining both the angular variation and week quantitative changes is presented. Selected carbon nanotubes electronic and optical properties are studied using the ab initio calculations in order to complete the outlook. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Raman scattering on semiconductor microtubes
Authors: Milekhin Alexander , Mutilin Sergei , Yukecheva Julia , Putyato Michael , Vorob'ev Alexander , Prinz Victor , Kolchuzhin Vladimir , Mehner Jan , Zahn Dietrich R. T. 
Published: July 2009

AbstractA micro‐Raman study of optical phonons in GaAs/InGaAs and InGaAs/InAs bilayer microtubes is presented. From the analysis of optical phonon frequencies the built‐in mechanical strain in the microtubes was estimated and compared with theoretical predictions. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Point defect phonons in intermetallics: NiAl3 by atomic‐scale simulation
Authors: Tingaud David , Besson Rémy 
Published: July 2009

AbstractInvestigating the influence of phonons on the point defect properties of D011 NiAl3 by means of an embedded‐atom potential, the present work demonstrates the importance of this factor, responsible for a large enhancement of the amounts of Al intrinsic and Ni interstitial defects, hence a complete change in the expected point defect structure of the compound, with possible consequences on matter diffusion. Moreover, new eigenfrequencies, above the DOS of the perfect crystal, are obtained around isolated Al interstitials and antisites, confirming the role of extra Al‐Al bonds in the rise of upper frequencies, a feature already noted in Ni3Al. However, such frequencies are also surprisingly detected in Ni‐rich alloys containing interstitial Ni, which suggests a Ni‐induced stiff coupling of Al atoms. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Synchrotron radiation – a brilliant source for solid‐state research in the infrared energy domain
Authors: Marcelli Augusto , Guidi Mariangela Cestelli , Piccinini Massimo , Innocenzi Plinio , Malfatti Luca , Xu Wei 
Published: July 2009

AbstractIR spectroscopy probes the rotations and the vibrations of molecules, the low‐energy excitations of solids and many other low‐energy phenomena occurring in condensed matter physics, chemistry, biophysics and materials science. Here we will present some examples of experiments that can experience a great advantage by IR synchrotron radiation sources in particular in the mid‐ and far‐IR domain. FTIR spectroscopy and reflectivity measurements are non‐destructive methods that can be applied to metallic, semiconductor or insulator systems returning accurate information on vibrtional and phonon spectra as a function of external parameters such as temperature or pressure. Far‐IR spectroscopy with synchrotron radiation may be indeed used to investigate with a DAC cell pressure‐driven insulator‐to‐metal transitions, one of the most intriguing phenomena exhibited by condensed matter. Another unique applications of IR SR is time‐resolved IR spectroscopy and imaging in materials science and in biology. However, also combined time‐resolved analysis (FTIR and SAXS) using two different radiations exciting the same system in a concurrent way is a powerful technique fundamental to understand complex phenomena.In particular, we will show how the combination of SAXS and mid‐IR spectroscopy correlates the solvent and the water evaporation kinetics explaining the structural organization of self‐assembly mesostructured films. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Carotenoids with anti‐Helicobacter pylori activity from Golden delicious apple
Authors: Molnár Péter , Deli József , Tanaka Toru , Kann Yoshiyuki , Tani Satoru , Gyémánt Nóra , Molnár Joseph , Kawase Masami 
Published: July 2009

AbstractPreviously it was reported that hypophasic carotenoids of Golden delicious apple peel showed potent anti‐H. pylori activity (MIC50 = 36 µg/mL), comparable to metronidazole (MIC50 = 45 µg/mL). To further investigate the involved active carotenoids of the apple peel extracts, seven carotenoids were isolated for the current study: (all‐E)‐luteoxanthin, (all‐E)‐neoxanthin, (9′Z)‐neoxanthin, (all‐E)‐antheraxanthin, (all‐E)‐violaxanthin, (9Z)‐violaxanthin and (all‐E)‐lutein. The MIC50 values of (all‐E)‐luteoxanthin, (all‐E)‐neoxanthin and (9′Z)‐neoxanthin were 7.9, 11 and 27 µg/mL, respectively. Other carotenoids and β,β‐carotene did not exhibit potent anti‐H. pylori activity (MIC50 > 100 µg/mL). An examination of structure and function suggested that active carotenoids contained a monofuranoid ring or an allenic bond in addition to an epoxy group and an additional two or three hydroxyl substituents on the side group. Copyright © 2009 John Wiley & Sons, Ltd.
Ensemble propagation and continuous matrix factorization algorithms
Authors: Bergemann Kay , Gottwald Georg , Reich Sebastian 
Published: July 2009

AbstractWe consider the problem of propagating an ensemble of solutions and its characterization in terms of its mean and covariance matrix. We propose differential equations that lead to a continuous matrix factorization of the ensemble into a generalized singular value decomposition (SVD). The continuous factorization is applied to ensemble propagation under periodic rescaling (ensemble breeding) and under periodic Kalman analysis steps (ensemble Kalman filter). We also use the continuous matrix factorization to perform a re‐orthogonalization of the ensemble after each time‐step and apply the resulting modified ensemble propagation algorithm to the ensemble Kalman filter. Results from the Lorenz‐96 model indicate that the re‐orthogonalization of the ensembles leads to improved filter performance. Copyright © 2009 Royal Meteorological Society
CUSUM charts for detecting special causes in integrated process control
Authors: Reynolds Marion R. , Park Changsoon 
Published: July 2009

AbstractThis paper investigates control charts for detecting special causes in an ARIMA(0, 1, 1) process that is being adjusted automatically after each observation using a minimum mean‐squared error adjustment policy. It is assumed that the adjustment mechanism is designed to compensate for the inherent variation due to the ARIMA(0, 1, 1) process, but it is desirable to detect and eliminate special causes that occur occasionally and produce additional process variation. It is assumed that these special causes can change the process mean, the process variance, the moving average parameter, or the effect of the adjustment mechanism. Expressions are derived for the process deviation from target for all of these process parameter changes. Numerical results are presented for sustained shifts, transient shifts, and sustained drifts in the process parameters. The objective is to find control charts or combinations of control charts that will be effective for detecting special causes that result in any of these types of parameter changes in any or all of the parameters. CUSUM charts designed for detecting specific parameter changes are considered. It is shown that combinations of CUSUM charts that include a CUSUM chart designed to detect mean shifts and a CUSUM chart of squared deviations from target give good overall performance in detecting a wide range of process changes. Copyright © 2009 John Wiley & Sons, Ltd.