bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sister Chromatids Segregate at Mitosis Without Mother–Daughter Bias in Saccharomyces cerevisiae
Authors: Keyes Brice E , Sykes Kenneth D , Remington Courtney E , Burke Daniel J 
Published: October 2012

Abstract
There is evidence accumulating for nonrandom segregation of one or more chromosomes during mitosis in different cell types. We use cell synchrony and two methods to show that all chromatids of budding yeast segregate randomly and that there is no mother–daughter bias with respect to Watson and Crick-containing strands of DNA.
Impact of Employment Contract Changes on Workers' Quality of Working Life, Job Insecurity, Health and Work‐related Attitudes
Authors: Wagenaar Alfred F. , Kompier Michiel A.J. , Houtman Irene L.D. , van den Bossche Seth N. J. , Taris Toon W. 
Published: October 2012

Impact of Employment Contract Changes on Workers' Quality of Working Life, Job Insecurity, Health and Work‐related Attitudes: Alfred F. WAGE‐NAAR, et al. Behavioural Science Institute, Department of Work and Organizational Psychology, Radboud University Nijmegen, The Netherlands—ObjectivesChanges in employment contracts may impact the quality of working life, job insecurity, health and work‐related attitudes. We examined the validity of two partly competing theoretical approaches. Based upon a segmentation approach, we expected no change in scores among stable trajectories, whereas upward trajectories were expected to be for the better and downward trajectories to be for the worse (Hypothesis 1). As turnover theories suggest that this hypothesis may only apply to workers who do not change employer, we also examined these contract trajectories stratified for a change of employer (Hypothesis 2). Methods and Results: Drawing on the 2007 and 2008 waves of the Netherlands Working Conditions Cohort Study (N=9,688), repeated measures analysis of covariance showed little across‐time change in the criterion variables, thus largely disconfirming our first hypothesis. These results could (at least partly) be explained by employer change; this was generally associated with improved scores among all contract trajectories (Hypothesis 2). However, workers receiving a less stable contract from the same employer were found to be at risk for health and well‐being problems.ConclusionsSegmentation theory‐based assumptions on contract trajectories primarily apply to stable and downward contract trajectories at the same employer, whereas assumptions from turnover theories better apply to contract trajectories combined with a change of employer. Future research should focus more closely on factors predicting “involuntary” downward trajectories into precarious temporary employment or unemployment.
Enhanced Magnetoelectric Response and Phonon Abnormality of Self-assembled Feather-like CoFe2O4-BaTiO3 Nanostructures
Authors: Deng Yu , Wu Di , Yu Huiqiang , Du Youwei 
Published: October 2012

ABSTRACTMagnetoelectric (ME) (CoFe2O4)0.3-(BaTiO3)0.7 (CFO-BTO) nanostructures have been synthesized by a combinative using of hydrothermal reaction and polymer-assisted deposition. The feather-like nanostructures have an average diameter of 250nm and lengths up to 5μm, with the single-crystal CFO nanopillars embedded in the BTO matrix. The CFO-BTO nanostructures exhibit good magnetic (Ms=21.0emu/g, Mr=10.4emu/g and Hc=560.7Oe) and ferroelectric properties (Ps=10.5μC/cm2, Pr=5.6μC/cm2), as well as a large ME coefficient of 51.8mV/cmOe. A prominent phonon abnormality has also been detected between 110°C and 140°C. With emphasis on the novel microstructure, the ME response and phonon abnormality of the CFO-BTO nanostructures have been discussed.
Fabrication and Surface Morphology of YBCO Superconducting Thin films on STO Buffered Si Substrates
Authors: Mutlu Zafer , Mutlu Yasar G. , Yilmaz Mucahit , Dogan Oguz , Ozkan Mihrimah , Ozkan Cengiz S. 
Published: October 2012

ABSTRACTPulsed Electron Deposition (PED) is an attractive alternative to Pulsed Laser Deposition (PLD) for growing high temperature superconductor thin films because of its relatively low cost. In this study, YBa2Cu3O7-δ(YBCO) thin film has been fabricated on silicon substrates by Pulsed Electron Deposition technique. SrTiO3 (STO) as a buffer layer has been grown between Si substrate and YBCO superconducting layer. The crystalline structures of STO/Si and YBCO/STO/Si films have been investigated by x-ray diffraction (XRD). The surface morphology and microstructure of YBCO/STO/Si thin film have been characterized with atomic force microscope (AFM) and scanning electron microscope (SEM). From the θ-2θ XRD analysis of YBCO thin films, (00l) diffraction peaks are obtained indicating they have a poor c-axis oriented structure. SEM analysis shows that the surfaces of films are crack-free, but they have some particulates. On AFM images, the droplets are clearly observed leading to a roughly surface.
Applications of Oxide Nanomaterials in Nonlinear Optics
Authors: Philip Reji , Sandeep C.S. Suchand , Seema R. , Krishnan Shiji , Chantharasupawong Panit , Kalarikkal Nandakumar , Thomas Jayan 
Published: October 2012

ABSTRACTNonlinear optical effects are revealed when strong light fields interact with matter. It has been shown that nanomaterials exhibit properties which are very different from the bulk, and in many cases, the nonlinear optical (NLO) efficiency of nanomaterials is found to be higher in comparison. Recently there has been substantial interest in developing novel NLO media for various applications. Even though several organic as well as inorganic materials have been studied in this connection, only a limited number of NLO reports exist for oxide nanomaterials. Therefore, in this paper we present results of NLO measurements recently conducted in our laboratory in three different oxide nanosystems. It is found that oxide nanomaterials are generally robust, and exhibit good NLO efficiencies, which make them potential candidates for photonic and optoelectronic applications.
Effect of the Type of Solvent and Bi-Stoichiometric Excess on the Purity of Nanocrystalline Bismuth Ferrite Single Phase
Authors: Montes-Albino Gina , Gálvez-Saldaña Marco , Renteria-Beleño Boris , Perales-Pérez Oscar 
Published: October 2012

ABSTRACTThe main challenge associated with the synthesis of pure bismuth ferrite (BFO) is the extremely high stability of parasitic or secondary phase Bi-oxides, which contaminates the single ferrite phase and affects the corresponding functional properties. Therefore, any attempt to determine the optimum synthesis conditions conducive to the inhibition of the formation of those impurity phases becomes indispensable. Accordingly, the present work addresses the systematic evaluation of the type of solvent and synthesis parameters to exclusively produce the BFO structure. Nanocrystalline BFO powders were synthesized after thermal treatment of the solid intermediates formed in ethylene glycol and acetic acid media. The experimental work also considered the effect of the excess of Bi species with respect to the BiFeO3stoichiometry and the annealing of the intermediates at different temperatures. The structure formation was confirmed by XRD analysis and magnetic properties were studied by VSM. X-ray diffraction analyses confirmed that powders exhibiting single phase BFO structure were produced after annealing the intermediate which was formed in acetic acid for one hour at 700°C. The average crystallite size and lattice parameter were calculated to be approximately 40 nm and 5.36 Å, respectively. It was also found that the synthesis under 7% of Bi-stoichiometric excess inhibited the formation of the parasitic phases after annealing the intermediate produced in ethylene glycol medium. The saturation magnetization of the powders annealed at 700°C were 0.15 emu/g and 0.17 emu/g when the BFO intermediates were formed in ethylene glycol and acetic acid media, respectively. The corresponding coercivity values were 6 Oe and 21 Oe.
Epitaxial thin films of ordered double perovskite SrLaVMoO6
Authors: Sanbou Katsutoshi. , Sakuma Keita. , Miyawaki Tetsuya. , Ueda Kenji. , Asano Hidefumi. 
Published: October 2012

ABSTRACTEpitaxial thin films of SrLaVMoO6 with an ordered double perovskite structure have been grown on (001) and (111) SrTiO3 substrates by magnetron sputtering. The optimized (111) film exhibited a clear (111) diffraction peak, which is a superlattice reflection of double perovskite unite cell, indicating clear B-site ordering. Temperature dependences of resistivity ρ show metallic behavior and transition point at 140~150 K, of which behavior is reminiscent of the electrical properties of materials showing long-range magnetic or antiferromagnetic order. XPS results of the Mo 3d core level spectra are discussed in terms of the B-site ordering and oxygen nonstoichiometry.
Structural, optical and magnetic properties of highly oriented transition metal (Mn/Co/Ni/Cu) doped ZnO thin films prepared by PLD
Authors: Aravind Arun , Jayaraj M.K. , Kumar Mukesh , Chandra Ramesh 
Published: October 2012

ABSTRACTZnO doped with transition metal (TM) thin films were grown by pulsed laser deposition. XRD pattern reveals that all the ZnTMO films have c-axis orientation normal to the substrate. The reciprocal space mapping shows that the crystallinity of ZnTMO film deteriorates at higher doping of TM. All the TM doped ZnO films have transmittance greater than 75% in the visible region. The band gap of the ZnTMO thin films shows red shift on doping with Ni and Cu where as blue shift is observed for Co and Mn which increases with TM concentration. The copper doped ZnO thin film shows green PL emission at 542 nm along with the band edge emission at 385 nm. But other TM doping shows only band edge emission (385nm) and its intensity decreases at higher doping percentage. The presence of non-polar E2high and E2lowRaman modes in thin films indicates that ‘TM’ doping do not alter the wurtzite structure of ZnO. The magnetic studies of the TM doped ZnO shows room temperature ferromagnetism
Relaxor Behavior in Ba0.8Sr0.2TiO3/ZrO2 Heterostructured Thin Films
Authors: Sahoo Santosh K. , Bakhru H. , Kumar Sumit , Misra D. , Mohapatra Y. N. , Agrawal D. C. 
Published: October 2012

ABSTRACTBa0.8Sr0.2TiO3 (BST) thin films and Ba0.8Sr0.2TiO3/ZrO2 heterostructured thin films have been successfully fabricated on Pt/Ti/SiO2/Si substrates by a sol-gel process. The dielectric properties of these films were measured as a function of temperature in the frequency range of 1 kHz to 1 MHz. It is clearly observed that the dielectric peaks exist and shift to high temperature with the increase of frequency indicating the presence of relaxor-type behavior in the films. Also it is seen that one dielectric peak is observed in single layer BST thin films whereas two dielectric peaks are observed in BST/ZrO2 heterostructured thin films due to the presence of two dielectric layers having different band gap energies. The variation of peak temperature Tm, corresponding to dielectric loss maximum, with frequency and fitting to Arrhenius law gives activation energy of 1.24 eV which is very close to the activation energy of oxygen vacancies in BaTiO3. Hence, oxygen vacancies are the active defects which are contributing to the relaxation process in these films.
Out-of-Plane and In-Plane Crystalline Orientations of Oxide Heterostructures of LSMO/ZnO
Authors: Uehara Kenichi , Reddy Sanapa Lakshmi , Okada Akira , Yokura Miyoshi , Kobayashi Shintaro , Inaba Katsuhiko , Nakajima Tomohiko , Tsuchiya Tetsuo , Endo Kazuhiro , Endo Tamio 
Published: October 2012

ABSTRACTHexagonal ZnO was grown on hexagonal (001) sapphire substrate, then cubic La(Sr)MnO3(LSMO) was grown on ZnO underlayer by ion beam sputtering at substrate temperatures of 550-750°C to obtain double-layer of LSMO/ZnO. Out-of-plane (001) oriented ZnO was grown with in-plane orientation of [10-10](0001)ZnO//[11-20](0001)sapphire. Mixed phase of LSMO with out-of-plane (001), (110) and (111) orientations was grown on (001) ZnO usually. However each single phase of LSMO could be grown by controlling deposition conditions. The LSMO grains have their in-plane orientations of [110](110)LSMO //[10-10](0001)ZnO and [110](111)LSMO//[11-20](0001)ZnO.
A Novel Approach For Nanocarbon Composite Preparation
Authors: Nasibulin Albert G. , Koltsova Tatyana , Nasibulina Larisa I. , Anoshkin Ilya V. , Semencha Alexandr , Tolochko Oleg V. , Kauppinen Esko I. 
Published: October 2012

ABSTRACTCarbon nanotubes (CNTs), nanofibers (CNFs) and graphene are promising components for the next generation high performance structural and multi-functional composite materials. One of the largest obstacles to create strong, electrically or thermally conductive CNT/CNF composites is the difficulty of getting a good dispersion of the carbon nanomaterials in a matrix. Typically, time-consuming steps of the carbon nanomaterial purification, ultrasound sonication and functionalization are required. We utilized a new approach to grow CNTs/CNFs directly on the surface of matrix, matrix precursor or filler particles. As the precursor matrix and fillers we utilized cement (clinker), copper powder, fly ash particles, soil and sand. Carbon nanomaterials were successfully grown on these materials without additional catalyst. Investigations of the physical properties of the composite materials based on these carbon modified particles revealed enhancement in the mechanical and electrical properties.
Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites
Authors: Ohtomo Akira , Chakraverty Suvankar , Mashiko Hisanori , Oshima Takayoshi , Kawasaki Masashi 
Published: October 2012

ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μBper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.
Nanophosphor-Embedded Oxide Glass-Matrix Nanocomposite for X-ray Imaging
Authors: Savage Nicholas , Wagner Brent , Zhang Yuelan , Lynch Brendan , Menkara Hisham , Summers Christopher , Kang Zhitao 
Published: October 2012

ABSTRACTTb doped gadolinium fluoride nanophosphors embedded in an aluminosilicate glass matrix is reported for X-ray imaging applications. The nanocomposite scintillators were prepared by a melt-quench method followed by annealing. The GdF3:Tb nanophosphors precipitated within the oxide glass matrix during the processing and their luminescence and scintillation properties were investigated.
Tuberculous Coxitis: Diagnostic Problems and Varieties of Treatment: A Case Report§
Authors: Klein H , Seeger JB , Schleicher I 
Published: October 2012

Although the prevalence of tuberculosis reduces, it still belongs to the most important infectious diseases worldwide even in industrial countries.We report an unusual case of tuberculous coxitis in a 28-year-old healthy native female with recurrent hip pain. While X-ray and microbiological examination of the aspirate showed no abnormality, only extended diagnostic measurements and detailed history led to the diagnosis of TBC. Although the patient did not show any pulmonary symptoms open tuberculosis was confirmed. After a course of antibiotic treatment she underwent reconstructive surgery which consecutively improved range of motion. This case report emphasizes that tuberculosis should still be considered as a significant disease even in healthy patients with uncertain complaints in joints without significant initial radiographic abnormalities. We recommend the described diagnostic procedures as well as an antibiotic and surgical treatment.
Filippov Lemma for certain second order differential inclusions
Authors: Bartuzel Grzegorz , Fryszkowski Andrzej 
Published: October 2012

Abstract
In the paper we give an analogue of the Filippov Lemma for the second order differential inclusions with the initial conditions y(0) = 0, y′(0) = 0, where the matrix A ∈ ℝd×d
and multifunction is Lipschitz continuous in y with a t-independent constant l. The main result is the following: Assume that F is measurable in t and integrably bounded. Let y
0 ∈ W
2,1 be an arbitrary function fulfilling the above initial conditions and such that where p
0 ∈ L
1[0, 1]. Then there exists a solution y ∈ W
2,1 to the above differential inclusions such that a.e. in [0, 1], .
Global bifurcation of homoclinic trajectories of discrete dynamical systems
Authors: Pejsachowicz Jacobo , Skiba Robert 
Published: October 2012

Abstract
We prove the existence of an unbounded connected branch of nontrivial homoclinic trajectories of a family of discrete nonautonomous asymptotically hyperbolic systems parametrized by a circle under assumptions involving topological properties of the asymptotic stable bundles.
Minimization of the number of periodic points for smooth self-maps of simply-connected manifolds with periodic sequence of Lefschetz numbers
Authors: Graff Grzegorz , Kaczkowska Agnieszka 
Published: October 2012

Abstract
Let f be a smooth self-map of m-dimensional, m ≥ 4, smooth closed connected and simply-connected manifold, r a fixed natural number. For the class of maps with periodic sequence of Lefschetz numbers of iterations the authors introduced in [Graff G., Kaczkowska A., Reducing the number of periodic points in smooth homotopy class of self-maps of simply-connected manifolds with periodic sequence of Lefschetz numbers, Ann. Polon. Math. (in press)] the topological invariant J[f] which is equal to the minimal number of periodic points with the periods less or equal to r in the smooth homotopy class of f.
In this paper the invariant J[f] is computed for self-maps of 4-manifold M with dimH
2(M; ℚ) ≤ 4 and estimated for other types of manifolds. We also use J[f] to compare minimization of the number of periodic points in smooth and in continuous categories.
Equivariant Morse equation
Authors: Styborski Marcin 
Published: October 2012

Abstract
The paper is concerned with the Morse equation for flows in a representation of a compact Lie group. As a consequence of this equation we give a relationship between the equivariant Conley index of an isolated invariant set of the flow given by .x = −∇f(x) and the gradient equivariant degree of ∇f. Some multiplicity results are also presented.
Seiberg-Witten invariants, the topological degree and wall crossing formula
Authors: Starostka Maciej 
Published: October 2012

Abstract
Following S. Bauer and M. Furuta we investigate finite dimensional approximations of a monopole map in the case b
1 = 0. We define a certain topological degree which is exactly equal to the Seiberg-Witten invariant. Using homotopy invariance of the topological degree a simple proof of the wall crossing formula is derived.
Elliptic problems in generalized Orlicz-Musielak spaces
Authors: Gwiazda Piotr , Minakowski Piotr , Wróblewska-Kamińska Aneta 
Published: October 2012

Abstract
We consider a strongly nonlinear monotone elliptic problem in generalized Orlicz-Musielak spaces. We assume neither a Δ2 nor ∇2-condition for an inhomogeneous and anisotropic N-function but assume it to be log-Hölder continuous with respect to x. We show the existence of weak solutions to the zero Dirichlet boundary value problem. Within the proof the L
∞-truncation method is coupled with a special version of the Minty-Browder trick for non-reflexive and non-separable Banach spaces.
Two Patterns of Changes in Nasal Nitric Oxide after Lysine Aspirin Nasal Challenge in Patients with Aspirin-exacerbated Respiratory Disease
Authors: Tworek Damian , Kuprys-Lipinska Izabela , Pietruszewska Wioletta , Kuna Piotr 
Published: October 2012

Background Nasal nitric oxide (nNO) levels after nasal lysine acetylsalicylic acid (lys-ASA) challenge have not been determined. This study was designed to determine a pattern of changes after lys-ASA challenge in aspirin-exacerbated respiratory disease (AERD) patients and to evaluate the usefulness of nNO measurements in the assessment of lys-ASA nasal challenge outcome. Methods Eighteen patients with aspirin hypersensitivity, nasal polyps, and asthma were included. Aspirin-tolerant control groups consisted of 10 healthy volunteers without asthma and nasal polyps and 10 patients with nasal polyps without asthma. All subjects underwent nasal challenge with lys-ASA. nNO was measured before and 1, 2, 4, and 24 hours after control solution and lys-ASA administration. Results A significant fall in nNO levels was noted in AERD patients with a positive result to challenges at time points 1 hour (p = 0.0033), 2 hours (p = 0.0033), and 3 hours (p = 0.026) after lys-ASA. A trend toward higher nNO concentrations was observed after lys-ASA challenge at the 2-hour (p = 0.018) and 4-hour (p = 0.018) time points compared with baseline in subjects with AERD and a clinically negative re to the challenge. No significant changes in nNO levels after the challenge were observed in control groups. The combined increase and decrease in nNO levels gave the sensitivity as 0.94 and specificity 1.00 at best. Conclusion nNO levels decrease after lys-ASA nasal challenge in subjects with AERD and a clinically positive result of the challenge. An unexpected trend toward an increase in nNO levels is observed in subjects with AERD and a clinically negative result of the challenge.
Rates of Emergence of HIV Drug Resistance in Resource-Limited Settings: A Systematic Review
Authors: Stadeli Kathryn M , Richman Douglas D 
Published: October 2012

Background The increasing availability of antiretroviral therapy (ART) has improved survival and quality of life for many infected with HIV, but can also engender drug resistance. This review summarizes the available information on drug resistance in adults in resource-limited settings. Methods The online databases PubMed and Google Scholar, pertinent conference abstracts and references from relevant articles were searched for publications available before November 2011. Data collected after ART rollout were reviewed. Results A total of 7 studies fulfilled the criteria for the analysis of acquired drug resistance and 22 fulfilled the criteria for the analysis of transmitted drug resistance (TDR). Acquired resistance was detected in 7.2% of patients on ART for 6–11 months, 11.1% at 12–23 months, 15.0% at 24-35 months, and 20.7% at ≥36 months. Multi-class drug resistance increased steadily with time on ART. The overall rate of TDR in all resource-limited countries studied was 6.6% (469/7,063). Patients in countries in which ART had been available for ≥5 years were 1.7x more likely to have TDR than those living in a country where ART had been available for <5 years ( P<0.001). The reported prevalence of TDR was 5.7% (233/4,069) in Africa, 7.6% (160/2,094) in Asia and 8.4% (76/900) in Brazil. Conclusions The emergence of drug resistance following access to ART in resource-limited settings resembles what was seen in resource-rich countries and highlights the need for virological monitoring for drug failure, drug resistance testing and alternative drug regimens that have proven beneficial in these resource-rich settings.