bluuebunny/crossref_metadata_2025_split huggingface dataset:
Acute metal stress in Populus tremula×P. alba (717‐1B4 genotype): Leaf and cambial proteome changes induced by cadmium2+
Authors: Durand Thomas C. , Sergeant Kjell , Planchon Sébastien , Carpin Sabine , Label Philippe , Morabito Domenico , Hausman Jean‐François , Renaut Jenny 
Published: February 2010

AbstractThe comprehension of metal homeostasis in plants requires the identification of molecular markers linked to stress tolerance. Proteomic changes in leaves and cambial zone of Populus tremula×P. alba (717‐1B4 genotype) were analyzed after 61 days of exposure to cadmium (Cd) 360 mg/kg soil dry weight in pot‐soil cultures. The treatment led to an acute Cd stress with a reduction of growth and photosynthesis. Cd stress induced changes in the display of 120 spots for leaf tissue and 153 spots for the cambial zone. It involved a reduced photosynthesis, resulting in a profound reorganisation of carbon and carbohydrate metabolisms in both tissues. Cambial cells underwent stress from the Cd actually present inside the tissue but also a deprivation of photosynthates caused by leaf stress. An important tissue specificity of the response was observed, according to the differences in cell structures and functions.
Asymptotic helicity conservation in SUSY
Authors: Gounaris G.J. , Layssac J. , Renard F.M. 
Published: February 2010

AbstractWe summarize the extensive work started in [1], according to which total helicity is conserved for any two‐to‐two process, at sqrt s >> MSUSY and fixed angles, in any SUSY extension of SM. Asymptotically the theorem is exact. But it may also have important implications at lower energies

. Up to now, these have been investigated to 1loop electroweak (EW) order for the processes

; as well as the 17 gg → HH', and the 9 gg → VH processes, where H,H' denote Higgs or Goldstone bosons, and V = Z, W±.
The effective actions of pseudoscalar and scalar particles in theories with gauge and conformal anomalies
Authors: Armillis R. , Corianò C. , Delle Rose L. , Guzzi M. , Mariano A. 
Published: February 2010

AbstractWe review recent work on the effective field theory description and the phenomenology of axion‐like and scalar particles in models characterized by gauge and/or conformal anomalies.
Auxetic properties of polycrystals
Authors: Jasiukiewicz Cz. , Paszkiewicz T. , Wolski S. 
Published: February 2010

AbstractYoung's and shear moduli and Poisson's ratio of polycrystalline solids consisting of two‐dimensional quadratic and three‐dimensional cubic randomly oriented grains of the same size and shape is studied. Considered polycrystals are initially unstrained. It is shown that for such polycrystals the division of the mechanical stability regions into areas of various auxeticity properties is different than for monocrystalline solids. In particular the regions of complete auxeticity enlarge.
On the role of electronic polarization in continuous structural transitions
Authors: Yang Xiaodong , Riseborough Peter S. , Smith J. L. , Shapiro S. M. , Lashley J. C. 
Published: February 2010

AbstractMartensitic transitions are defined to be diffusionless structural transitions that lower the crystal symmetry and in which the order parameter, usually strain and shuffle, changes discontinuously. It had been proposed that martensitic transitions are driven by the entropy, due to the soft phonons. Anderson and Blount have shown that it is highly improbable that structural transitions are second‐order (continuous), and they have suggested that the apparently continuous structural transition in V3Si is a ferroelectric transition. Recently, a continuous structural martensitic transition has also been identified in crystalline AuZn by Lashley et al. Furthermore, pressure measurements on AuZn show that the martensitic temperature can be depressed and suggest the existence of a quantum critical point. The exact nature of the apparently continuous structural transitions is still being debated. However, measurements of magneto‐acoustic oscillations in the speed of sound of AuZn indicate that the phonon softening may be driven by the polarization of the conduction electrons. This has been confirmed by recent measurements on AuZn and V3Si in magnetic fields, which have shown that the transitions are intimately linked to the dielectric response, and are in accord with the predictions of Dieterich and Fulde for V3Si. The field dependence of the electronic polarization and its role in the transition is discussed.
Theoretical investigation of a CDDW Hamiltonian for YBa2Cu3O7−δ
Authors: Goswami Partha 
Published: February 2010

AbstractWe investigate a chiral d‐density wave (CDDW) mean field Hamiltonian in momentum space for the under‐doped YBa2Cu3O7−δ (YBCO). We consider the commensurate density wave order which doubles the unit cell of the real space lattice and show that the transition to CDDW state gives rise to the occurrence of jump discontinuities in the entropy density difference between the CDDW state and the normal metallic state at eight points (“Hot spots”) on the boundary of the reduced Brillouin zone. The chirality induced anomalous Nernst signal is shown to arise mainly from the points, close to these “Hot spots,” and located on the boundary of the hole pockets as reported by the previous workers. Finally, we discuss the possibility of quantum oscillations in the specific heat for the system under consideration in the presence of a changing magnetic field.
Magnetic Grüneisen ratio of the random transverse‐field Ising chain
Authors: Vojta Thomas , Hoyos José A. 
Published: February 2010

AbstractThe magnetic analog of the Grüneisen parameter, that is, the magnetocaloric effect, is a valuable tool for studying field‐tuned quantum phase transitions. We determine the magnetic Grüneisen parameter of the one‐dimensional random transverse‐field Ising model, focusing on its low‐temperature behavior at the exotic infinite‐randomness quantum critical point and in the associated quantum Griffiths phases. We present extensive numerical simulations showing that the magnetic Grüneisen parameter diverges logarithmically with decreasing temperature in the quantum Griffiths phase. It changes sign right at criticality. These results confirm a recent strong‐disorder renormalization group theory. We also compare our findings to the behavior of the clean transverse‐field Ising chain.
Observation of pseudogap in the normal state of superconducting Mo3Sb7
Authors: Tran V. H. , Batkova M. , Batko I. , Pribulová Z. , Bukowski Z. 
Published: February 2010

AbstractUsing electron tunneling spectroscopy, we investigated density of states of Mo3Sb7 in the temperature range 1.7–60 K. The differential conductance dI/dV vs. V curve at 4.2 K shows that an energy pseudogap of $2\Delta \sim 15(2){\rm meV}$ is formed in the density of states. In the superconducting state, the tunneling spectra exhibit the presence of a BCS‐type superconducting gap of $\Delta _{{\rm sc}} (0) \sim 0.24{\rm meV}$. Future investigations of the interplay between superconductivity and possible SDW ordering, and the anisotropic nature of the nesting of the Fermi surface in Mo3Sb7 are highly desired. magnified imageTunneling spectra of Mo3Sb7 measured in the normal state (a) and in the superconducting state (b).
Scanning tunneling microscopy studies on CeCoIn5 and CeIrIn5
Authors: Ernst S. , Wirth S. , Steglich F. , Fisk Z. , Sarrao J. L. , Thompson J. D. 
Published: February 2010

AbstractHigh‐quality single crystals of the heavy fermion superconductors CeCoIn5 and CeIrIn5 have been studied by means of low‐temperature scanning tunneling microscopy. Methods were established to facilitate in situ sample cleaving. Spectroscopy in CeCoIn5 reveals a gap which persists to above Tc, possibly evidencing a precursor state to superconductivity. Atomically resolved topographs show a rearrangement of the atoms at the crystal surface. This modification at the surface might influence the surface properties as detected by tunneling spectroscopy.
Angular dependence of the upper critical field Bc2 for CeCu2Si2
Authors: Vieyra Hugo A. , Oeschler Niels , Jeevan Hirale S. , Geibel Christoph , Steglich Frank 
Published: February 2010

AbstractThe angular dependence of the upper critical field Bc2 for A/S‐type CeCu2Si2 samples is determined. Both, the anisotropies within and outside the basal plane are measured using an angle‐resolved resistivity technique, where an external magnetic field serves as a directional probe. Two high‐quality A/S‐type single crystals are studied (TN ∼ 0.8 K, Tc ∼ 0.6 K). For the case where the magnetic field rotates within the basal plane, small variations of ∼0.5% are observed and ascribed to sample misalignment. When the magnetic field rotates from the basal plane towards the [001] direction, a strong anisotropy of Bc2 (∼20%) is observed. By comparing the expected orbital‐ and Pauli‐limiting fields, the strong effect of Pauli paramagnetism is realized. The latter is taken into account when using the anisotropic mass model to study the field anisotropy. Deviations are observed from such a conventional model.
Non‐magnetic Kondo effect in M–As–Se (M = Zr, Hf, Th) phases
Authors: Cichorek Tomasz , Bochenek Lukasz , Henkie Zygmunt , Schmidt Marcus , Czulucki Andreas , Kniep Rudiger , Steglich Frank 
Published: February 2010

AbstractThermodynamic and transport properties of the tetragonal M–As–Se (M = Zr, Hf, Th) phases demonstrate that these materials are disordered metals with the electronic‐specific‐heat coefficient as small as, e.g., 0.3 mJ K−2 mol−1 for Th–As–Se. Remarkably, all the M–As–Se systems display a magnetic‐field‐independent AT1/2 term in the low‐temperature electrical resistivity. As observed for ZrAs1.595Se0.393, the magnitude of this extra term may vary by a factor of nearly 3 as well as the resistivity minimum is shifted from 10.8 to about 15.0 K, dispite virtually the same electron‐diffusion constant. On the other hand, a magnetic‐field (B ≤ 14 T) dependence of the electron transport in arsenide selenides is strongly material dependent: both the positive and negative sign of the magnetoresistivity being proportional to either B2 or B1/2 were found. These observations point to a non‐magnetic Kondo effect due to a random distribution of structural two‐level systems in the disordered As/Se sublattice.
On the concept of effective temperature in current carrying quantum critical states
Authors: Kirchner Stefan , Si Qimiao 
Published: February 2010

AbstractQuantum criticality has attracted considerable attention both theoretically and experimentally as a way to describe part of the phase diagram of strongly correlated systems. A scale‐invariant fluctuation spectrum at a quantum critical point (QCP) implies the absence of any intrinsic scale. Any experimental probe may therefore create an out‐of‐equilibrium setting; the system would be in a non‐linear response regime, which violates the fluctuation–dissipation theorem (FDT). Here, we study this violation and related out‐of equilibrium phenomena in a single‐electron transistor (SET) with ferromagnetic leads, which can be tuned through a quantum phase transition. We review the breakdown of the FDT and study the universal behavior of the fluctuation–dissipation relation of various correlators in the quantum critical regime. In particular, we explore the concept of effective temperature as a means to extend the FDT into the non‐linear regime.
Effect of cooling field strength and ferromagnetic shell shape on exchange bias in nanoparticles with inverted ferromagnetic–antiferromagnetic core‐shell morphology
Authors: Hu Yong , Liu Yan , Du An 
Published: February 2010

AbstractThe dependence of exchange bias (EB) effects on cooling field strength and particle shape in nanoparticles with antiferromagnetic (AFM) interfacial coupling and inverted AFM core with a fixed radius and ferromagnetic (FM) shell with various thicknesses are investigated by using a modified Monte Carlo Metropolis method. It is found that with the increase of cooling field, field‐cooled exchange bias field (HE) fluctuates in the range of negative values initially, and then has an abrupt jump from the negative value to the positive value, finally levels off. However, HE decreases as the FM shell shape varies from No. 1 to No. 13 regardless of the strength of cooling field. Coercivity is affected by cooling fields and shapes indicating distinct behaviors. Because the AFM core is almost unaffected by shape and frozen completely during measuring hysteresis loops, the effect of ferromagnets on EB, negligible in most of other systems, is ambiguously manifested in such an unconventionally structural system. Moreover, the phenomena are interpreted well by presenting the snapshots of microscopic spin energy distributions, which make us observe directly and vividly the movement of domains and the competition of energies. This work will shed new light into the microscopic origin of peculiar magnetic properties of nanoparticles with special structures.
Preface: Phys. Status Solidi C 7/2
Authors: Bechstedt Friedhelm , Zahn Dietrich R. T. , Nanishi Yasushi , Ponce Fernando A. 
Published: February 2010

AbstractThe 12th International Conference on the Forma‐tion of Semiconductor Interfaces (ICFSI‐12) brought together world‐leading experts in the area of semi‐conductor interfaces including their preparation, physics, and application. The focus was on recent ad‐vances in controlling and characterizing the physical and chemical properties of semiconductors in contact with metals, other semiconductors, insulators, or mo‐lecular overlayers with special emphasis on electronic, spintronic, photonic, and photovoltaic applications. The conference subtitle “From Semiconductors to Nanoscience and Applications with Biology” indicates the enormous impact of semiconductors and their interfaces on applications in biological, environmental, and even medical fields. ICFSI‐12 in Weimar thus found considerable interest in the science community and around 230 scientists from all around the world actively participated. The highlights of the conference included the plenary and invited talks on theory and experiments of graphene given by Steven Louie, Walt de Heer, and Thomas Seyller. Additionally, the audience was highly impressed by the in situ electron microscopy observations of silicon and germanium nanowire growth presented by Frances Ross as well as by the atomic‐scale in situ characterisation of solid/electrolyte interfaces by Klaus Wandelt. Finally, Robert Hamers reviewed his work on biomolecular interfaces to semiconductor surfaces. He also received the Semiconductor Surfaces, Interfaces, and Nanostructure Prize for his outstanding contributions to the field. Altogether 6 plenary, 14 invited, and 114 contributed talks as well as 104 poster contributions were presented at the ICFSI‐12 conference. Of these contributions around 100 papers can be found as contributions in these proceedings. They are organised in the follow‐ing subsections:– Surfaces and deposition– Liquid–solid interfaces– Organic interfaces– Heterojunctions– High‐k and oxide materi‐als– Wide bandgap materials– Nanowires and nanotubes– Graphene– Nanoparticles– DevicesThe success of the conference was not only based on the lively discussions and scientific exchange, but also due to the inspiring environment provided by the Congress Centrum Neue Weimarhalle and the City of Weimar itself. The participants enjoyed an entertaining social program including a concert “Musical Weimar: From Bach to Liszt” and a lecture on Goethe. The support of the Neue Weimarhalle and the Hotel Leonardo staff is thus gratefully acknowledged. Moreover, very special thanks go to Simone Lange, Sybille Raschke, and Lutz Feige for their great support. Their effort enormously helped to run the conference smoothly and make it enjoyable for everybody.ICFSI‐12 was a great success demonstrating the timeliness of the subject. We are thus very much looking forward to the next ICFSI‐13 conference to be held in Prague in 2011. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Neuroprotective effect of HT008‐1, a prescription of traditional Korean medicine, on transient focal cerebral ischemia model in rats
Authors: Bu Youngmin , Kwon Sungeun , Kim Yun Tai , Kim Mi‐Yeon , Choi Hoyoung , Kim Jae Goo , Jamarkattel‐Pandit Nirmala , Doré Sylvain , Kim Sung‐Hoon , Kim Hocheol 
Published: February 2010

AbstractHT008‐1 is one of the prescriptions used in Traditional Korean Medicine for the treatment of mental and physical weakness. It is composed of Panax ginseng, Acanthopanax senticosus, Angelica sinensis and Scutellaria baicalensis, which have been reported to have various pharmacological effects on the central nervous system. The study investigated whether HT008‐1 has neuroprotective effects in a focal cerebral ischemia rat model. Stroke was induced in rats by 2 h of middle cerebral artery occlusion (MCAo) followed by 22 h of reperfusion. HT008‐1 (30, 100 and 300 mg/kg) and the component herbs (300 mg/kg) were administered orally twice at 0 and 2 h after ischemia. Oral administration of 300 mg/kg HT008‐1 reduced brain infarction by 45.7%, prolonged the latency time by 24.8% in the rotarod test, and enhanced the score by 17.0% in the balance beam test. Only P. ginseng and S. baicalensis showed protective effects, and HT008‐1 showed a greater effect than its component herbs. HT008‐1 down‐regulated the COX‐2 and OX‐42 expression in the penumbra region. In conclusion, the results show that HT008‐1 may be effective in a rat stroke model by an antiinflammatory mechanism and may improve sensory‐motor function by reducing damage in the cortex and caudoputamen. Copyright © 2010 John Wiley & Sons, Ltd.
Horse chestnut extract contracts bovine vessels and affects human platelet aggregation through 5‐HT2Areceptors: anin vitrostudy
Authors: Felixsson Emma , Persson Ingrid A.‐L. , Eriksson Andreas C. , Persson Karin 
Published: February 2010

AbstractExtract from seeds and bark of horse chestnut (Aesculus hippocastanumL) is used as an herbal medicine against chronic venous insufficiency. The effect and mechanism of action on veins, arteries, and platelets are not fully understood. The aim of this study was to investigate the effects and mechanisms of action of horse chestnut on the contraction of bovine mesenteric veins and arteries, and human platelet aggregation. Contraction studies showed that horse chestnut extract dose‐dependently contracted both veins and arteries, with the veins being the most sensitive. Contraction of both veins and arteries were significantly inhibited by the 5‐HT2Areceptor antagonist ketanserin. No effect on contraction was seen with the cyclooxygenase inhibitor indomethacin, the α1receptor antagonist prazosin or the angiotensin AT1receptor antagonist saralasin neither in veins nor arteries. ADP‐induced human platelet aggregation was significantly reduced by horse chestnut. A further reduction was seen with the extract in the presence of ketanserin. In conclusion, horse chestnut contraction of both veins and arteries is, at least partly, mediated through 5‐HT2Areceptors. Human platelet aggregation is reduced by horse chestnut. The clinical importance of these findings concerning clinical use, possible adverse effects, and drug interactions remains to be investigated. Copyright © 2010 John Wiley & Sons, Ltd.
On an analytical model for the rapid intensification of tropical cyclones
Authors: Montgomery Michael T. , Smith Roger K. 
Published: February 2010

AbstractStimulated by recent developments in understanding tropical cyclones, we offer an evaluation of an analytical model that has been proposed to explain the rapid intensification of these storms. We articulate a number of concerns with this model, including the neglect of both the vertical momentum equation and the thermodynamic equation, and conclude that it falls a little short of achieving its stated aims. Copyright © 2010 Royal Meteorological Society
Comprehensive characterization of marine dissolved organic matter by Fourier transform ion cyclotron resonance mass spectrometry with electrospray and atmospheric pressure photoionization
Authors: D'Andrilli Juliana , Dittmar Thorsten , Koch Boris P. , Purcell Jeremiah M. , Marshall Alan G. , Cooper William T. 
Published: February 2010

AbstractWe compare the ultrahigh resolution 9.4 T Fourier transform ion cyclotron resonance (FT‐ICR) mass spectra of marine dissolved organic matter (DOM) isolated from two sites in the Weddell Sea (Antarctica) obtained by complementary electrospray ionization (ESI) and atmospheric pressure photoionization (APPI). Ions produced by APPI extend to higher carbon unsaturation than those produced by ESI, indicated by higher double‐bond equivalents (rings plus double bonds) minus oxygen (DBE‐O) values, whereas ESI‐generated ions are more oxygenated. Moreover, many sulfur‐containing compounds were efficiently ionized by ESI but not detected by APPI. Because the mass spectra obtained by ESI and APPI are significantly different, both are necessary to obtain a more complete description of the molecular composition of marine DOM. Copyright © 2010 John Wiley & Sons, Ltd.
Method for improved secondary ion yields in cluster secondary ion mass spectrometry
Authors: Brewer Tim M. , Szakal Christopher , Gillen Greg 
Published: February 2010

AbstractA method to increase useful yields of organic molecules is investigated by cluster secondary ion mass spectrometry (SIMS). Glycerol drops were deposited onto various inkjet‐printed arrays and the organic molecules in the film were rapidly incorporated into the drop. The resulting glycerol/analyte drops were then probed with fullerene primary ions under dynamic SIMS conditions. High primary ion beam currents were shown to aid in the mixing of the glycerol drop, thus replenishing the probed area and sustaining high secondary ion yields. Integrated secondary ion signals for tetrabutylammonium iodide and cocaine in the glycerol drops were enhanced by more than a factor of 100 compared with an analogous area on the surface, and a factor of 1000 over the lifetime of the glycerol drop. Once the analyte of interest is incorporated into the glycerol microdrop, the solution chemistry can be tailored for enhanced secondary ion yields, with examples shown for cyclotrimethylenetrinitramine (RDX) chloride adduct formation. In addition, depositing localized glycerol drops may enhance analyte secondary ion count rates to high enough levels to allow for site‐specific chemical maps of molecules in complex matrices such as biological tissues. Published in 2010 by John Wiley & Sons, Ltd.