bluuebunny/crossref_metadata_2025_split huggingface dataset:
Elucidation of the complexation mechanism between (+)‐usnic acid and cyclodextrins studied by isothermal titration calorimetry and phase‐solubility diagram experiments
Authors: Segura‐Sanchez Freimar , Bouchemal Kawthar , Lebas Geneviève , Vauthier Christine , Santos‐Magalhaes Néréide S. , Ponchel Gilles 
Published: January 2009

AbstractIn the present work the complexation mechanism between (+)‐usnic acid (UA) and cyclodextrins (CDs) has been investigated by isothermal titration calorimetry (ITC) and phase‐solubility diagrams using pH as a tool for modifying the molecule ionization. ITC experiments have been employed to evaluate the stoichiometry of interaction (N), affinity constants (K), and thermodynamic parameter variation associated with complexation between (+)‐UA and α‐, β‐, HP‐β‐, SBE‐β‐, and γ‐CD. It was shown that (+)‐UA did not interact with α‐CD and tended to interact more favorably with γ‐CD (K = 1030 M−1, ΔG = −17.18 kJ · mol−1) than β‐CD (K = 153 M−1, ΔG = −12.46 kJ · mol−1) forming 1:1 complexes. It was also demonstrated using ITC and solubilization experiments that chemical modifications of the parent β‐CD resulted in stronger and more spontaneous interactions (K = 281 M−1, ΔG = −13.97 kJ · mol−1 for SBE‐β‐CD and K = 405 M−1, ΔG = −14.87 kJ · mol−1 for HP‐β‐CD). Analysis of the thermodynamic data suggested that van der Waals forces and hydrogen bonds were responsible for the formation of complexes with a predominance of van der Waals forces. Finally, pH induced modifications of (+)‐UA ionization provided important informations relative to the topology of the interaction between (+)‐UA molecule and the γ‐CD cavity, which were confirmed by molecular modeling. Copyright © 2009 John Wiley & Sons, Ltd.
Determination of nutrients and volatile constituents of Agaricus bisporus (brown) at different stages
Authors: Çaǧlarırmak Necla 
Published: January 2009

AbstractBACKGROUND: The physical properties, proximate composition, mineral and vitamin contents, and estimated volatile components of Portobello mushroom, Agaricus bisporus (brown), were analyzed in three flushes and at two different harvest times. The results showed different trends in the flushes and harvest terms studied.RESULTS: The mean values of texture, diameter, and protein of the harvested produce were 1.78–1.97 kg mm−2, 4.67–5.02 cm, and 4.18–3.31% wet weight basis (wb), respectively. The mean Zn, Fe, P, Mg, K, Na, and Ca contents of both harvests (mg kg−1 wb) were 8.15–7.07, 7.40–7.96, 1180.93–1038.69, 88.05–76.29, 213.29–238.82, 2652.0–2500.89, and 534.2–554.80, respectively. In terms of vitamin C, folic acid, thiamin, riboflavin, and niacin, the mean contents (mg kg−1 wb) were 6.75–3.97, 0.09–0.08, 0.085–0.09, 0.27–0.29, and 3.62–2.94, respectively. The estimated volatile components comprised 18‐ or 16‐carbon compounds such as octadecanoic acid, hexadecanoic acid derivatives, and other important volatiles like dl‐limonene, n‐nonane, benzendicarboxylic acid, and cis‐linoleic acid esters.CONCLUSION: Nutritive contents and estimated volatiles of Portobello mushroom were evaluated in detail at different stages. Copyright © 2009 Society of Chemical Industry
Exploring new potential health‐promoting vegetables: glucosinolates and sensory attributes of rocket salads and related Diplotaxis and Eruca species
Authors: D'Antuono L Filippo , Elementi Simona , Neri Roberta 
Published: January 2009

AbstractBACKGROUND: Rocket salads (Diplotaxis tenuifolia and Eruca vesicaria) are presently highly appreciated salad vegetables. Related species are consumed as food plants in several regions, and may contribute to differentiation in the fresh food supply chain. Glucosinolates are well‐known healthy phytochemicals and responsible for positive and negative sensory properties of edible Brassicaceae. To investigate the potential for exploitation of new crops, Diplotaxis and Eruca germplasm was subject to sensory evaluation and glucosinolate analysis.RESULTS: Typical rocket salad flavour and pungency were perceived as positive sensory traits. Bitter, and especially herbaceous notes, characterised the groups of less accepted accessions. The groups classified as significantly unpleasant were characterised by high glucosinolate content, with either sinigrin (strong perceived pungency, flavour and several other additional sensory notes), or sinalbin/gluconapin (strong herbaceous note, low flavour perceived), as the dominant components.CONCLUSIONS: Low glucosinolate content, and a composition rich in recognised health‐promoting components (glucoerucin, glucoraphanin) were associated with higher acceptance. In relation to food uses, moderate glucosinolate content and high acceptance may be a better option to enhance the intake of healthy phytochemicals than high glucosinolates and potential rejection. High glucosinolate types may find better perspectives in the field of food integrators. Copyright © 2009 Society of Chemical Industry
Hyperbolic–parabolic singular perturbation for quasilinear equations of Kirchhoff type with weak dissipation
Authors: Yamazaki Taeko 
Published: January 2009

AbstractWe consider a hyperbolic–parabolic singular perturbation problem for a quasilinear hyperbolic equation of Kirchhoff type with dissipation weak in time. The purpose of this paper is to give time‐decay convergence estimates of the difference between the solutions of the hyperbolic equation above and those of the corresponding parabolic equation, together with the unique existence of the global solutions of the hyperbolic equation above. Copyright © 2009 John Wiley & Sons, Ltd.
Tetrapterosides A and B, two new oleanane‐type saponins from Tetrapleura tetraptera
Authors: Noté Olivier Placide , Mitaine‐Offer Anne‐Claire , Miyamoto Tomofumi , Paululat Thomas , Pegnyemb Dieudonné Emmanuel , Lacaille‐Dubois Marie‐Aleth 
Published: January 2009

AbstractFrom the stem bark of Tetrapleura tetraptera, two new oleanane‐type saponins, tetrapteroside A 3‐O‐{6‐O‐[(2E,6S)‐2,6‐dimethyl‐6‐hydroxyocta‐2,7‐dienoyl]‐β‐D‐glucopyranosyl‐(1 → 2)‐β‐D‐glucopyranosyl‐(1 → 3)‐β‐D‐glucopyranosyl‐(1 → 4)‐[β‐D‐glucopyranosyl‐(1 → 2)]‐β‐D‐glucopyranosyl}‐3,27‐dihydroxyoleanolic acid (1), and tetrapteroside B 3‐O‐{ β‐D‐glucopyranosyl‐(1 → 2)‐6‐O‐[(E)‐feruloyl]‐β‐D‐glucopyranosyl‐(1 → 3)‐β‐D‐glucopyranosyl‐(1 → 4)‐[β‐D‐glucopyranosyl‐(1 → 2)]‐β‐D‐glucopyranosyl}‐3,27‐dihydroxyoleanolic acid (2), were isolated. Further extractions from the roots led to the isolation of four known oleanane‐type saponins. Their structures were elucidated by the combination of mass spectrometry (MS), one and two‐dimensional NMR experiments. Copyright © 2009 John Wiley & Sons, Ltd.
Enhancing nanocrystalline diamond surface conductivity by deposition temperature and chemical post‐processing
Authors: Kozak H. , Kromka A. , Ledinsky M. , Rezek B. 
Published: January 2009

AbstractThe surface conductivity of nanocrystalline diamond (NCD) films as a function of deposition temperature and chemical post‐processing was characterized by current–voltage measurements using co‐planar Au electrodes. Raman spectroscopy was applied to investigate the bulk quality of NCD films and characterize the relative amount of sp3 diamond phase in the volume. The surface material properties and morphology were studied using atomic force microscopy (AFM) in tapping and phase detection regimes. The results indicate that the chemical post‐processing of as‐grown NCD films by boiling in acid and re‐hydrogenation leads to a significant increase in the surface conductivity by three orders of magnitude, in the order of 10–7 (Ω/□)–1. As a function of the deposition temperature (with re‐hydrogenation temperature kept constant) the surface conductivity of nanocrystalline diamond films shows optimum around 600 °C. This enhancement is attributed to the lowest amount of sp2 phase on the surface. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Thermionic field emission in Pt–Al0.45Ga0.55N Schottky photodiode
Authors: Cheng C. J. , Si J. J. , Ding J. X. , Zhang X. F. , Zhang L. , Zhao L. , Lu Z. X. , Sun W. G. 
Published: January 2009

AbstractFabrication and current transport mechanisms dominant of Pt–Al0.45Ga0.55N Schottky photodiode grown on sapphire by metalorganic chemical vapor deposition are reported. Transport has been modeled using thermionic field emission theory. The ideality factor decreases from 2.18 to 1.50, while the barrier height increases from 0.82 eV to 1.14 eV with increasing temperature at 198–323 K. There is a linear relationship between the barrier heights and the ideality factors of the Schottky contact. The ln (I) versus V curve at small forward current are almost parallel in this temperature range, which can be well explained by thermionic field emission theory with the characteristic energy E00 of 36.0 meV. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Structural characteristics of a multilayer of silicon rich oxide (SRO) with high Si content prepared by LPCVD
Authors: Quiroga E. , Bensch W. , Yu Z. , Aceves M. , De Souza R. A. , Martin M. , Zaporojtchenko V. , Faupel F. 
Published: January 2009

AbstractSingle layer films and a multilayer structure of SRO (Silicon Rich Oxide) have been prepared by LPCVD (Low Pressure Chemical Vapour Deposition) and characterized by FTIR, SIMS, XPS, TEM and AFM measurements. The stacked structure is composed of alternating layers of SRO with high Si content and SRO with low Si content. The layered structure is confirmed by SIMS and TEM measurements. The composition of the materials is discussed. Besides Si nanocrystals, the existence of agglomerates of silicon oxide with structure close to fused silica and the existence of oxynitrides is evidenced in the films with high Si content. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Perovskite phase formation and electrical properties of Pb(Fe1/2Nb1/2)O3 ferroelectric ceramicse
Authors: Sun Renbing , Tan Wei , Fang Bijun 
Published: January 2009

AbstractPb(Fe1/2Nb1/2)O3 (PFN) ferroelectric ceramics with pure perovskite structure were synthesized successfully by conventional solid‐state reaction method via the direct calcining route and the wolframite precursor route. The feasible formation of pure perovskite phase PFN can be attributed to its appropriate tolerance factor and electronegativity difference. PFN ceramics prepared by the above both methods exhibit broad dielectric response peaks (ϵm) accompanied by large dielectric loss and apparent dielectric frequency dispersion, with temperatures of dielectric maximum (Tm) locating at around 90 °C. 0.25 wt% MnO2 and 0.25 wt% Li2CO3 doping can greatly decrease dielectric loss and sharpen dielectric response peaks of the PFN ceramics synthesized by the above both methods. The dielectric frequency dispersion is also suppressed accordingly. However, Tm of the MnO2‐ and Li2CO3‐doped PFN ceramics maintains almost invariable. The remanent polarization (Pr) of the MnO2‐ and Li2CO3‐doped PFN ceramics prepared by the wolframite precursor method is slightly larger than Pr of those prepared by the direct calcining method. Piezoelectric constant d33 of the 0.25 wt% MnO2‐doped PFN ceramics prepared by the direct calcining method is the largest among all the samples synthesized, reaching 134 pC/N. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Domain‐wall dynamics in bistable magnetic microwires
Authors: Varga Rastislav , Kostyk Yuriy , Richter Kornel , Zhukov Arcady , Vazquez Manuel 
Published: January 2009

AbstractIn the present work we give an overview on the domain‐wall dynamics in amorphous glass‐coated microwires with positive magnetostriction. They are characterized by a peculiar domain structure that allows us to study the magnetization process of a single domain wall. The domain‐wall dynamics is characterized by at least 4 regimes. At low field, the interaction of the domain wall with the defects is observed that is characteristic for the adiabatic regime. At medium field, the domain wall moves in a viscous regime, where the domain‐wall velocity is proportional to the applied magnetic‐field amplitude. At higher fields, the domain‐wall mobility steeply increases as a result of the change of the domain‐wall structure. Finally, the domain wall reaches very high velocities, four times higher than the sound velocity measured in microwires. In some cases, the Walker limit is observed in this range. Moreover, the interaction of the domain wall with phonons was observed when the domain wall approaches the sound velocity. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Domain wall dynamics in Fe‐rich glass covered amorphous microwires
Authors: Santos Jesús Daniel , Ruiz Álvaro , Cobos Raúl F. , Ribot Iván , Vega Víctor , Álvarez Pablo , Sánchez María Luisa , Sánchez Ll. José Luis , de la Prida Víctor M. , Hernando Blanca 
Published: January 2009

AbstractThe influence of glass covering on domain wall propagation in Fe65B15Si15C5 amorphous microwires is studied, before and after glass removal. High values of domain wall velocity and mobility have been obtained. The domain wall velocity depends linearly on the driving magnetic field. However, the mobility of the domain wall is very different in both situations studied. The results are explained due to the modification of internal stress distribution after glass removing, that change the domain structure of the sample. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Frequency dependence of switching field in the soft nucleus of FeSiB–CoNi microwires
Authors: Infante Germán , Torrejón Jacob , Merazzo Karla J. , Badini‐Confalonieri G. A. , Vázquez Manuel 
Published: January 2009

AbstractThe dynamic (AC) switching field in the soft FeSiB bistable nucleus of the Fe77.5Si7.5B15–Co90Ni10 bi‐phase microwires family has been measured over the frequency range 20 Hz to 2 kHz. Microwires with a CoNi thickness ranging between 0.5 μm and 8 μm were studied. Results are well fitted by a power law dependence of the switching field H * on magnetic field frequency f. As the thickness of the harder CoNi outer shell is increased, the parameters which characterise the best fit experience noticeable changes. The origin of such behaviour is interpreted in terms of modifications in the soft FeSiB nucleus domain structure, accordingly to previous established models. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Stability of the crystal structure of L‐valine under high pressure
Authors: da Silva J. Hermínio , Lemos V. , Freire P. T. C. , Melo F. E. A. , Filho J. Mendes , Lima J. A. , Pizani P. S. 
Published: January 2009

AbstractRaman scattering measurements were carried out on a single crystal of L‐valine with the pressure increasing from the ambient value to 6.9 GPa. Sudden changes in intensity of the bands were observed in the higher energy spectral range at ∼3 GPa and ∼5.3 GPa. Discontinuities observed in the wave number vs. pressure plots occurred in the complete spectrum at those same pressures, suggesting changes in the crystal structure. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
High pressure and high magnetic field behaviour of free and donor‐bound‐exciton photoluminescence in InSe
Authors: Millot M. , Gilliland S. , Broto J. M. , Gonzalez J. , Leotin J. , Chevy A. , Segura A. 
Published: January 2009

AbstractWe report here first magneto‐photoluminescence investigations under high pressure up to 6 GPa on III–VI layered semiconductor InSe. Both diamagnetism and magnetic field induced gap opening driven by Landau quantization became observable by using a 60 T pulsed magnet. The pressure‐induced enhancement of the diamagnetic coefficient is consistent with the increase of the dielectric constant under pressure while the evolution of the linear coefficient is consistent with a slight increase of the electron effective mass up to 4 GPa and a direct‐to‐indirect conduction‐band crossover around that pressure. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Effect ofCitrus paradisiextract and juice on arterial pressure bothin vitroandin vivo
Authors: Díaz‐Juárez J. A. , Tenorio‐López F. A. , Zarco‐Olvera G. , Valle‐Mondragón L. del , Torres‐Narváez J. C. , Pastelín‐Hernández G. 
Published: January 2009

AbstractCitrus paradisi(grapefruit) consumption is considered as beneficial and it is popularly used for the treatment of a vast array of diseases, including hypertension. In the present study, the coronary vasodilator and hypotensive effects ofCitrus paradisipeel extract were assessed in the Langendorff isolated and perfused heart model and in the heart and lung dog preparation. In both models,Citrus paradisipeel extract decreased coronary vascular resistance and mean arterial pressure when compared with control values (60 ± 15 × 107dyn s cm−5vs 100 ± 10 × 107dyn s cm−5and 90 mmHg vs 130 ± 15 mmHg, respectively). These decreases in coronary vascular resistance and mean arterial pressure were blocked when isolated and perfused hearts and mongrel dogs were pre‐treated with L‐NAME. In humans,Citrus paradisijuice decreased diastolic arterial pressure and systolic arterial pressure both in normotensive and hypertensive subjects.Citrus paradisijuice produced a greater decrease in mean arterial pressure when compared withCitrus sinensisjuice, cow milk and a vitamin C‐supplemented beverage. However, more detailed studies are required to isolate, purify and evaluate the chemical compounds responsible for this pharmacological effect and to clarify its possible role for treating hypertension. Copyright © 2009 John Wiley & Sons, Ltd.
Vaginal robot‐assisted radical hysterectomy (VRARH) after laparoscopic staging: feasibility and operative results
Authors: Oleszczuk Agnieszka , Köhler Christhardt , Paulick Jeanette , Schneider Achim , Lanowska Malgorzata 
Published: January 2009

AbstractBackgroundTo describe a technique of vaginal robot‐assisted radical hysterectomy (VRARH) that utilizes the advantages of a robotic system and eliminates the manipulation of cancer tissue.MethodsA prospective study was performed for VRARH using the da Vinci® robotic surgical system in 12 patients. The procedure was indicated in patients with cervical cancer stage FIGO IB1 after laparoscopic lymphadenectomy. A tumour‐adapted vaginal cuff was created transvaginally.ResultsAll operations were completed with minimal blood loss (mean 123 ml). The mean operative time including para‐aortic lympadenectomy was 356 min, the vaginal cuff creation took 43 min and the radical robotic resection 68 min. No uterine manipulator was used. There were no bladder or bowel complications and no conversion to standard laparoscopy or laparotomy.ConclusionsThe VRARH technique combines the advantages of the vaginal route and robotic laparoscopic surgery: tumour contamination is avoided and complications are minimized. This procedure could be superior to techniques described previously. Copyright © 2009 John Wiley & Sons, Ltd.
Feeding habits, forage selection, and diet overlap in Alpine chamois (Rupicapra rupicapra L.) and domestic sheep
Authors: La Morgia Valentina , Bassano Bruno 
Published: January 2009

AbstractFecal microhistological analyses have been used to assess the summer diet of chamois (Rupicapra rupicapra L., 1758) and domestic sheep and to evaluate diet overlap. The aim of our work was to investigate interspecific interactions and to assess the effects of sheep grazing on the summer feeding habits of chamois. A high dietary overlap (Pianka's index = 0.93–0.99) was found, despite differences in the use of some plant groups. Sheep presence strongly affected chamois feeding habits: a reduction of highly digestible forbs was observed in the chamois diet during August, when both species grazed in the same range. As a consequence of sheep grazing, chamois may have been forced to reduce niche breadth and to change their food habits, increasing percentages of monocotyledons in the diet and feeding mainly on Cyperaceae. The diet overlap between sheep and chamois suggests that resource‐mediated interactions as well as direct competition must be taken into account when evaluating chamois and sheep compatibility on Alpine meadows.
Linker histone‐like proteins in Muscovy duck (Cairina moschata L) erythrocyte chromatin
Authors: Kowalski Andrzej , Pałyga Jan , Górnicka‐Michalska Ewa 
Published: January 2009

AbstractLinker Histone‐Like proteins (LHL1 and LHL2) were identified within a linker histone complement of Muscovy duck erythrocyte chromatin. Polyacrylamide gel electrophoretic patterns of N‐bromosuccinimide‐cleaved LHL products as well as liquid chromatography‐electrospray‐ion trap mass spectrometry analyses of trypsin‐digested LHL peptides revealed structural similarity of LHL1 to histone H5 and between LHL2 and histone H1 subtypes.Since the LHL proteins were stable in the presence of 2‐mercaptoethanol and dithiothreitol that reduce disulfide bonds, it appeared unlikely that this doublet was a thiol‐derived product of linker histones. A loss of LHL1, with a concomitant maintenance of LHL2 after treatment with dilute alkali, seems to suggest that they might represent disparate protein conjugates resulting from linker histone modifications through ester linkages.
Feline Myocardial Disease: 1: Classification, Pathophysiology and Clinical Presentation
Authors: Ferasin Luca 
Published: January 2009

Practical relevance Myocardial disease (cardiomyopathy, CM) is the most common cardiac disorder observed in cats. The disease usually leads to the development of congestive heart failure, which is the major cause of cardiac mortality. Arterial thromboembolism is another severe outcome often associated with feline CM. Patient group The median age of cats when diagnosed with a form of CM is 5.5 years (range 4 months to 16 years). The disease appears to be equally distributed between males and females and among different breeds, although a genetic predisposition of some pedigrees should be taken into consideration (ie, Maine Coons, Ragdolls, Norwegian Forest cats). Audience General practitioners, as well as specialists in small animal medicine, cardiology and pathology, have to deal with CM on a regular basis. Clinical challenges The diagnosis and clinical management of myocardial disease in cats represents one of the greatest challenges in veterinary cardiology. Although several attempts have been made to standardise the classification of CM, both in humans and cats, some disagreement still exists among cardiologists. Classification criteria are continuously evolving as the aetiology of myocardial disease becomes better understood. It is now widely appreciated that, for a given aetiology, there may be a spectrum of phenotypes ranging from restrictive to dilated. Diagnostics The diagnosis and classification of CM is primarily based on echocardiographic criteria. However, phenotypic variability is substantial, even within a single form of CM, and this often causes subjective interpretations of echocardiographic diagnosis, especially by inexperienced echocardiographers. Post-mortem examination is an alternative approach to diagnosis. Evidence base The clinical management of feline myocardial disease is even more controversial, especially in the light of recent clinical studies. This two-part article reviews the literature to date, discusses various manifestations of the disease in cats and offers a critical, and often controversial, approach to diagnosis and management.