bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanochemical synthesis of thenoyltrifluoroacetone-1,10-phenanthroline europium complex
Authors: Zaharieva Joana , Milanova Maria , Todorovsky Dimitar 
Published: September 2012

Abstract
The paper considers the possibilities for mechanochemical synthesis of rare earth complexes. The complex Eu(TTA)3·phen (HTTA — 2-thenoyltrifluoroacetone, phen — 1,10-phenanthroline) is synthesized by mechanical treatment of a mixture of EuCl3.6H2O, HTTA, phen and NaOH in planetary ball mill Pulverisette 7 for 30 min at 800 min−1. The non reacted starting reagents and reaction side products are separated by treating activated mixture with water-ethanol solution following a procedure proposed in the literature. The elemental composition, X-ray diffraction pattern, IR spectra, optical properties (excitation and emission spectra, luminescence lifetime) and morphology of the mechanochemically synthesized complex are compared with those of the complex prepared from solution by the conventional method. The results confirm close similarity in the molecular structure and identity of the elemental composition, X-ray diffractograms and fluorescence properties of the compounds prepared by both methods.
Magnetic resonance study of carbon encapsulated Ni nanoparticles
Authors: Bobrowska Marta , Typek Janusz , Zolnierkiewicz Grzegorz , Wardal Kamil , Guskos Niko , Pelech Iwona , Podsiadly Marcin , Narkiewicz Urszula 
Published: September 2012

Abstract
Magnetic resonance study of six samples consisting of carbon encapsulated nickel nanoparticles or carbon nanotubes ended with such nickel nanoparticles was carried out at room temperature. Samples of Ni/C were prepared by carburization of nanocrystalline nickel by ethylene (C2H4) and methane (CH4). Hydrocarbons decomposition on nickel nanoparticles was done at temperatures 500, 600 and 700°C. Magnetic resonance spectra of samples designated as CH4/500, CH4/600, CH4/700, C2H4/500, C2H4/600 and C2H4/700 were obtained by Bruker E 500 spectrometer. The integrated intensities of the resonance spectra were correlated with the carburization conditions (temperature, type of hydrocarbon) during samples preparation. A core-shell model of the investigated samples allowed rough estimation of appropriate shell sizes.
Novel quercetin derivatives: synthesis and screening for anti-oxidant activity and aldose reductase inhibition
Authors: Veverka Miroslav , Gallovič Ján , Švajdlenka Emil , Veverková Eva , Prónayová Naďa , Miláčková Ivana , Štefek Milan 
Published: September 2012

AbstractThe direct acylation of quercetin (I) with 3-chloro-2,2-dimethylpropanoyl chloride (II) gives a complex reaction mixture. The synthesis of different acylated quercetin with from mono- to tetra-O-substituted functions was achieved in a simple procedure wherein the yield of isomers depended on the stoichiometric ratio of reagents. The crude reaction mixtures were analysed (LC-MS) and compared with the isolated products. Unambiguous structural characterisation of isomeric quercetin derivatives was confirmed by NMR analysis. In addition, the quercetin dimer can be obtained in a high yield in the simple procedure. The anti-oxidant activity and aldose reductase inhibition of the compounds were screened with the aim of providing bi-functional remedies to treat diabetic complications and other diseases where oxidative stress and the polyol pathway are key etiological factors.
Synthesis and properties of macrocyclic diazene switch with binaphthalene unit attached via acrylamide linkers
Authors: Kicková Anna , Horváth Branislav , Kerner Lukáš , Putala Martin 
Published: September 2012

Abstract2,2′-Diiodo-1,1′-binaphthalene undergoes a tandem Heck reaction with methyl acrylate to afford methyl 2-(7H-dibenzo[c,g]fluoren-7-ylidene)acetate. As a consequence, the target macrocyclic diazene with binaphthalene unit attached via acrylamide linker was prepared by the stepwise building of acrylamide at a binaphthalene moiety, including the Doebner modification of the Knoevenagel condensation, and completed by oxidative macrocyclisation of aniline end-groups. Despite being an equimolar mixture of monomer and dimer, it exhibited remarkable changes in CD spectra due to reversible (E/Z) isomerisation of N=N diazene bonds upon irradiation at 365/465 nm. Although the dimer isomerises from (E) to (Z) isomer 7.4 times faster than the monomer, the latter’s contribution to the change in ellipticity at 307 nm in the photostationary state is 2.4 times greater.
Bien vieillir : à quelles conditions ?
Authors: Toussaint Jean-François 
Published: September 2012

Vieillir est un processus universel complexe, multifactoriel et non programmé. Au sein d’une espèce, l’organisation du génome détermine la durée de vie moyenne mais les contraintes extérieures modulent largement cette valeur pour chaque individu. Vieillir longuement reste le privilège des populations développées : le rôle d’un environnement clément, transformé par l’homme, y est capital. Mais jusqu’où vieillirons-nous ? Et à quelles conditions ? L’accumulation des contraintes actuelles limite-t-elle nos capacités d’adaptation alors que certaines asymptotes évoquent un plafond d’ici une à deux générations ?
La prévention : un nouveau référentiel pour une politique du vieillissement ?
Authors: Argoud Dominique 
Published: September 2012

En l’espace de peu de temps, prévention et vieillissement sont deux termes de plus en plus associés. Cette orientation de l’action publique trouve son origine dans le renouvellement de la politique du troisième âge autour du « bien vieillir » et dans la volonté de limiter les coûts liés à la dépendance. Mais elle ne semble toutefois pas à la hauteur des enjeux posés par le vieillissement compte tenu de la difficulté à promouvoir une approche intersectorielle de la société.
Conception d'actions innovantes et modélisation
Authors: Dejardin Philippe 
Published: September 2012

Dès 1975, les institutions de retraite complémentaire Agirc (Association générale des institutions de retraite des cadres) et Arrco (Association pour le régime de retraite complémentaire des salariés) ont engagé une réflexion sur la nécessité d’envisager une démarche préventive et non plus essentiellement curative dans une perspective générale d’éducation à la santé destinée à leurs allocataires. Dans cette optique, des centres de prévention ont été mis en place afin de créer des lieux de dépistage, d’éducation sanitaire, d’écoute et d’orientation. L’objectif vise à permettre au bénéficiaire de se positionner en tant qu’acteur, choisissant ainsi d’adapter, tout au long de son avancée en âge, son comportement à ses propres choix de prévention dans le but de tendre vers un « état de complet bien-être physique, mental et social » augmentant ainsi son espérance de vie sans incapacité.
Quand le livre devient relique
Authors: Diemberger Hildegard 
Published: September 2012

L’idée bouddhiste selon laquelle les textes sont des reliques, et leur distribution un « acte méritoire », a fortement pesé dans l’invention de l’imprimerie en Chine sous la dynastie Tang, au viie siècle, et plus tard dans la diffusion de cette découverte au sein de l’Empire mongol. Au xve siècle, c’est la même idée qui sous-tend ce que l’on pourrait sans doute décrire comme une « révolution de l’imprimerie » au Tibet. S’appuyant sur le plus ancien imprimé du Tibet central qui soit parvenu jusqu’à nous, et qui n’a été que récemment mis au jour, le présent article s’attache à montrer comment certaines attitudes à l’égard des livres, ancrées dans des traits culturels spécifiques, ont pu avoir une incidence sur les technologies utilisées pour la production, et la reproduction, de ces mêmes livres, et influencer la façon d’aborder de tels objets textuels – une influence qui perdure de nos jours.
Quand le texte se fait matière
Authors: JUNGEN Christine 
Published: September 2012

Comment faire vivre un manuscrit ? C’est la question qui se pose au centre des manuscrits créé dans la Bibliotheca Alexandrina, en Égypte, spécialisé dans la collecte, le traitement et la restauration de manuscrits arabes. Patrimoine littéraire et objet d’histoire, codex à conserver et livre à lire, le manuscrit a en effet pour particularité de se situer aussi bien dans l’univers textuel de la lecture et de la transmission érudite que dans celui matériel de la préservation et de la sauvegarde. Le suivi des traitements de l’objet manuscrit sous différentes formes (microfilm, codex, image numérisée) permet d’examiner la manière dont le manuscrit est déployé en versions alternatives : celles-ci proposent non seulement différentes relations entre le texte et la matière, la copie et l’original, l’authentique et la reproduction, mais également des ontologies plurielles du livre comme matière à lire, à manipuler et à contempler.
Correlation of Anterior Segment Parameters in Keratoconus Patients
Authors: Torquetti Leonardo 
Published: September 2012

ABSTRACT

Purpose
To evaluate the corneal asphericity, volume, thickness and keratometry and the correlation among these variables in keratoconus patients.

Materials and methods
A total of 1,071 eyes of 810 patients diagnosed with keratoconus were evaluated with a Pentacam (Oculus Optikgerate GmbH). Five groups were established according to the mean keratometry readings: Very mild [K < 44.0 diopters (D)], mild (K = 44.0-47.0D), moderate (K = 47.0-52.0D), severe (K = 52.0-60.0D) and very severe (K = 60.0 or higher). The following parameters were obtained: Anterior corneal asphericity (Q), corneal volume (CV) and thinnest corneal thickness (TCT).

Results
Sixty-six eyes had very mild keratoconus, 269 had mild keratoconus, 465 had moderate keratoconus, 233 had severe keratoconus and 38 had very severe keratoconus. As the severity of disease increases, there is an increment in K and CV values and reduction of Q and TCT. There was a statistically significant difference in values for all parameters, except the CV. The Pearson correlation index showed an inverse correlation between the degree of keratoconus and the asphericity (Q), i.e. the more severe the keratoconus the more negative the Q-value. Only in the very severe group there was no statistically significant correlation between K and Q. There was no correlation between severity of keratoconus and CV. There was an inverse correlation between keratoconus grade and TCT; the more advanced the disease the less the TCT value. Only in the very mild group there was no correlation between K and TCT.

Conclusion
The corneal asphericity and pachymetry are inversely correlated to keratometry in keratoconus patients. There is no correlation between CV and severity of keratoconus.

How to cite this article
Torquetti L, Ferrara G, Ferrara P. Correlation of Anterior Segment Parameters in Keratoconus Patients. Int J Kerat Ect Cor Dis 2012;1(2):87-91.
Storytelling Through Video: A Bilingual Approach in Teaching
Authors: Alaya-Ay, Jr. Gaudencio M. 
Published: September 2012

This is an experimental study on the effect of storytelling through video and the lecture method in which both approaches used English and Maranao versions to the 100 Grade II pupils in Balo-I District, Lanao del Norte Division, Philippines, SY 2011-2012. The study utilized the two-group experimental design of research.The tool for teaching was the story entitled “The Greatest Treasure” which was adapted from www.bookbox.com (retrieved, 2011) and was translated to the Maranao version for the other group of respondents. A researchermade test in Maranao and English versions were used in comparing the effects of the bilingual approaches in teaching. The statistical tools used in analyzing the data were frequency count, mean, paired, and independent t-test. The findings revealed that majority of the respondents in the video group both in English and Maranao versions scored very high in the post tests compared to the traditional lecture method. These implied that there were significant differences in academic achievements of video and lecture groups in Maranao and English versions. It was concluded that pupils can comprehend well if storytelling will be done using the latest technology and if also presented both in English and in their own native language or mother tongue. Conclusively, the use of video technology is effective in story telling as an innovative strategy in teaching. Keywords - video storytelling, bilingual approach, innovative strategy
Employees' negative and positive work–home interaction and their association with depressive symptoms
Authors: Nitzsche Anika , Jung Julia , Pfaff Holger , Driller Elke 
Published: September 2012

AbstractBackgroundDepression is the leading cause of disability and high costs worldwide. One possibility for preventing depression in the workplace, which has received little consideration so far, is the promotion of a successful balance between work and personal life. The aim of this study was to investigate employees' negative and positive work–home interaction and their association with depressive symptoms.MethodsA cross‐sectional study was conducted in the micro‐ and nanotechnology sector in Germany. A stepwise multivariate logistic regression analysis was performed using data from N = 213 employees.ResultsThe results suggest that while negative work–home interaction is associated with an increased risk for depressive symptoms, positive work–home interaction is correlated with a lower risk. Neither positive nor negative interaction in the home‐to‐work direction demonstrated a significant association with depressive symptoms.ConclusionWhen attempting to prevent mental illnesses, such as depression, it is important to develop strategies aimed at reducing conflict between work and personal life and promoting a positive exchange between these two domains. Am. J. Ind. Med. 56:590–598, 2013. © 2012 Wiley Periodicals, Inc.
Nevus vascularis mixtus (cutaneous vascular twin nevi) associated with intracranial vascular malformation of the Dyke–Davidoff–Masson type in two patients
Authors: Ruggieri Martino , Milone Pietro , Pavone Piero , Falsaperla Raffaele , Polizzi Agata , Caltabiano Rosario , Fichera Marco , Gabriele Anna Lia , Distefano Angela , De Pasquale Rocco , Salpietro Vincenzo , Micali Giuseppe , Pavone Lorenzo 
Published: September 2012

AbstractThe term twin spotting refers to phenotypes characterized by the spatial and temporal co‐occurrence of two (or more) different nevi arranged in variable cutaneous patterns, and can be associated with extra‐cutaneous anomalies. Several examples of twin spotting have been described in humans including nevus vascularis mixtus, cutis tricolor, lesions of overgrowth, and deficient growth in Proteus and Elattoproteus syndromes, epidermolytic hyperkeratosis of Brocq, and the so‐called phacomatoses pigmentovascularis and pigmentokeratotica. We report on a 28‐year‐old man and a 15‐year‐old girl, who presented with a previously unrecognized association of paired cutaneous vascular nevi of the telangiectaticus and anemicus types (naevus vascularis mixtus) distributed in a mosaic pattern on the face (in both patients) and over the entire body (in the man) and a complex brain malformation (in both patients) consisting of cerebral hemiatrophy, hypoplasia of the cerebral vessels and homolateral hypertrophy of the skull and sinuses (known as Dyke–Davidoff–Masson malformation). Both patients had facial asymmetry and the young man had facial dysmorphism, seizures with EEG anomalies, hemiplegia, insulin‐dependent diabetes mellitus (IDDM), autoimmune thyroiditis, a large hepatic cavernous vascular malformation, and left Legg‐Calvé‐Perthes disease (LCPD) [LCPD‐like presentation]. Array‐CGH analysis and mutation analysis of the RASA1 gene were normal in both patients. © 2012 Wiley Periodicals, Inc.
Selective Regulation of Nicotine and Polyamines Biosynthesis in Tobacco Cells by Enantiomers of Ornithine
Authors: Gholami Morteza , Fakhari Ali Reza , Ghanati Faezeh 
Published: September 2012

ABSTRACTl‐ and d‐amino acids have diverse functions and effects on the metabolism, growth, and development of plants. Ornithine (Orn) plays a main role in the biosynthesis of many amino acids, nicotinic alkaloids, and polyamines in tobacco. This investigation describes the impact of Orn enantiomers on the production and distribution of free, conjugated, and bound polyamines, as well as nicotine in tobacco cells. It was recognized that the biosynthesis of metabolites was differently upregulated by each enantiomer. Putrescine was abundantly produced by exogenous l‐ornithine ( l‐Orn), and both spermidine and spermine were significantly accumulated in d‐ornithine ( d‐Orn)‐supplied tobacco cells. Furthermore, nicotine production was highly upregulated by l‐Orn, while the addition of d‐Orn had no effect on the nicotine content of tobacco cells. It was observed that transcript expression of S‐adenosylmethionine decarboxylase, as the key enzyme of spermidine/spermine biosynthesis, is coincident with their metabolic levels and is highly upregulated by d‐Orn, as opposed to l‐Orn. These results indicate that both enantiomers of Orn can trigger selected biosynthetic pathways in the cells, at the transcript level. Regarding these observations, it is proposed that l‐ and d‐Orn function differently in the same biological pathways in which the latter, d‐Orn specifically regulates important polyamines in the plant cells. Chirality 25:22–27, 2013. © 2012 Wiley Periodicals, Inc.
Job Classification for the Purpose of Making Optimal Decisions Concerning Management Control
Authors: Peris‐Ortiz Marta , Rueda‐Armengot Carlos , Pechuán Ignacio Gil 
Published: September 2012

AbstractThe job classification literature has been dominated by a micro‐level orientation reflective of the needs of specialists in human resources. In contrast, we take a multidisciplinary approach involving both micro‐ and macro‐level variables to propose a relatively simple system comprised of four job classes. Our model isintended to inform management as to the type and mix of controls (e.g., centralization, formalization, and various human resources policies) that could be applied to different job types to optimally promote the overall goals of the organization. Fuzzy numbers analysis is employed to illustrate the application of the system using four jobs in a car dealership in Spain. Copyright © 2012 ASAC. Published by John Wiley & Sons, Ltd.
Motor Unit
Authors: Heckman C.J. , Enoka Roger M. 
Published: September 2012

AbstractMovement is accomplished by the controlled activation of motor unit populations. Our understanding of motor unit physiology has been derived from experimental work on the properties of single motor units and from computational studies that have integrated the experimental observations into the function of motor unit populations. The article provides brief descriptions of motor unit anatomy and muscle unit properties, with more substantial reviews of motoneuron properties, motor unit recruitment and rate modulation when humans perform voluntary contractions, and the function of an entire motor unit pool. The article emphasizes the advances in knowledge on the cellular and molecular mechanisms underlying the neuromodulation of motoneuron activity and attempts to explain the discharge characteristics of human motor units in terms of these principles. A major finding from this work has been the critical role of descending pathways from the brainstem in modulating the properties and activity of spinal motoneurons. Progress has been substantial, but significant gaps in knowledge remain. © 2012 American Physiological Society.Compr Physiol2:2629‐2682, 2012.
Energy and Metabolism
Authors: Suarez Raul K. 
Published: September 2012

AbstractAlthough firmly grounded in metabolic biochemistry, the study of energy metabolism has gone well beyond this discipline and become integrative and comparative as well as ecological and evolutionary in scope. At the cellular level, ATP is hydrolyzed by energy‐expending processes and resynthesized by pathways in bioenergetics. A significant development in the study of bioenergetics is the realization that fluxes through pathways as well as metabolic rates in cells, tissues, organs, and whole organisms are “system properties.” Therefore, studies of energy metabolism have become, increasingly, experiments in systems biology. A significant challenge continues to be the integration of phenomena over multiple levels of organization. Body mass and temperature are said to account for most of the variation in metabolic rates found in nature. A mechanistic foundation for the understanding of these patterns is outlined. It is emphasized that evolution, leading to adaptation to diverse lifestyles and environments, has resulted in a tremendous amount of deviation from popularly accepted scaling “rules.” This is especially so in the deep sea which constitutes most of the biosphere. © 2012 American Physiological Society.Compr Physiol2:2527‐2540, 2012.
Access to Some Angular Aminochromeno[2,3‐c]pyrazole Precursors by a Domino Knoevenagel–hetero‐Diels–Alder Reaction
Authors: Parmar Narsidas J. , Pansuriya Bhavesh R. , Labana Balvantsingh M. , Sutariya Tushar R. , Kant Rajni , Gupta Vivek K. 
Published: September 2012

AbstractA new, solvent‐free tetrabutylammonium‐hydrogensulfate‐catalysed one‐pot procedure to synthesise angular benzopyran‐annulated pyrazoles, all of which incorporate a tertiary ring‐junction carbon, has been demonstrated. A typical intermediate Knoevenagel heterodiene, formed by the reaction of 2‐(alkenyloxy)‐ or 2‐(alkynyloxy)acetophenones with pyrazolones smoothly underwent a subsequent hetero‐Diels–Alder reaction to give chromeno‐fused pyrazoles in a highly stereoselective reaction. When nitro‐containing DKHDA products were treated further with Fe/HCl in tandem, they formed the corresponding amino frameworks in a reduction step, which highlights a new possibility for this cascade route to give aminopolyheterocycles. The stereochemistry of all new tertiary ring‐junction carbon‐containing polyheterocycles was confirmed by 2D NMR spectroscopy experiments, DQF‐COSY and NOESY, and single crystal X‐ray diffraction data. None of the products has had their biological profiled evaluated before, and they are expected to have heterosteroidal biological functions.
The in vitro and in vivo antioxidant properties of Cyperus esculentus oil from Xinjiang, China
Authors: Jing Siqun , Ouyang Weiqi , Ren Zhiyan , Xiang Hengxu , Ma Zexin 
Published: September 2012

AbstractBackgroundCyperus esculentus oil is also known as the new health care oil. This study aimed to analyse the fatty acid profile and content of C. esculentus oil by gas chromatography–mass spectrometry and to assess the antioxidant activity of C. esculentus oil. These properties were evaluated based on the reducing power, hydroxyl radical and diphenyl picryl hydrazyl radical scavenging, and a combination of in vitro and in vivo antioxidant experiments.ResultsComposition analyses showed that C. esculentus oil contained more than 800 g kg−1 unsaturated fatty acid, of which oleic acid accounted for 691.4 g kg−1, linoleic acid accounted for 107.0 g kg−1 and palmitic acid accounted for 158.0 g kg−1. In vitro results showed that the total antioxidant activity and the scavenging capacity of hydroxyl radicals and diphenyl picryl hydrazyl radicals increased with increasing concentration. The in vitro antioxidant ability increased as the concentration of C. esculentus oil, with 15 mL kg−1 BW day−1 being established as the optimal dose.ConclusionTaken together, the results of this study clearly indicate that C. esculentus oil has good antioxidant properties. © 2012 Society of Chemical Industry