bluuebunny/crossref_metadata_2025_split huggingface dataset:
Migrants maghrébins et leurs descendants : un marché matrimonial sur les deux rives de la Méditerranée
Authors: Kateb Kamel 
Published: August 2013

Les sociétés maghrébines sont en transition d’un système matrimonial à mariage précoce et arrangé par le groupe familial vers un système à mariage tardif où le libre choix du conjoint devient effectif. La socialisation dans la société française a-t-elle favorisé la fin de cette transition pour les descendants de migrants ? Pour répondre à cette question générale, nous avons comparé, en utilisant les données d’enquêtes sur l’histoire familiale EHF(1999) et sur l’histoire de vie HDV (2003), des descendants de migrants maghrébins avec des immigrés du Maghreb arrivés récemment en France et présentant des caractéristiques socioéconomiques similaires. Nous avons constaté qu’un processus de socialisation sous double contrainte (familial et sociétal) diversifie les comportements chez les descendants de migrants et favorise de nouveaux flux migratoires à la faveur d’un marché matrimonial qui s’appuie sur les deux rives de la Méditerranée.
Environnement familial au Burkina Faso : typologie et cohabitation parents-enfants
Authors: Miangotar Yode , Legrand Thomas 
Published: August 2013

Cette étude décrit l’environnement familial desenfants et des adolescents du Burkina Faso au moyen des donnéesdes Enquêtes démographiques et de santé (EDS) de1993 et de 2003 et de l’Enquête nationale sur lesadolescents de 2004 et elle explore la relation entre la cohabitationparentale et les caractéristiques du chef de ménage, duménage et des enfants ou des adolescents ainsi que lascolarisation de ces derniers. Les résultats montrent que lamajorité des enfants (78,4 % en 1993 et 77,6 % en2003) et des adolescents (61,1 % en 2004) vit auprès de sesdeux parents, en union monogame ou polygame. La proportion des enfantset des adolescents orphelins, qu’ils soient confiés oucohabitant avec un seul parent, est non négligeable. C’estdans l’adolescence que la cohabitation avec les deux parents estla moins répandue. La cohabitation avec les parents estassociée significativement aux caractéristiques du chefde ménage, du ménage, des enfants et des adolescentsainsi qu’à la scolarisation de ces deux groupes.
Le son tactile ou la sensorialité excentrique dans les performances solos de Magali Babin
Authors: Abenavoli Lorella 
Published: August 2013

Comment l’éphémère frôlement d’une caresse peut-il devenir un objet esthétique ? Comment l’effleurement digital sur l’épiderme minéral d’une feuille de schiste peut-il devenir musique ? Comment l’intime expérience tactile peut-elle devenir l’espace d’un rituel artistique collectif ? Comment le son électronique devient-il, chez Magali Babin, médium d’une sensorialité excentrique ? Cet article nous emmène dans l’une des contrées de la pratique de Magali Babin : le monde tactile de l’audio qu’elle déploie dans ses performances solos. Auteure d’une oeuvre sonore polymorphe, Magali Babin est une artiste québécoise, performeure, compositrice et interprète, inaugurant depuis deux ans les pratiques installatives sonores. Elle est une figure majeure de la scène alternative montréalaise en art audio, de l’improvisation « à risque » ainsi que de la musique expérimentale, déambulant librement entre les catégories artistiques les plus actuelles.
Lutter pour exister
Authors: Greissler Élisabeth , Labbé François 
Published: August 2013

Cet article vise à analyser les conditions d’émergence du Rassemblement de la
Jeunesse citoyenne (RAJE citoyenne), une action directe non violente coordonnée par le
Regroupement des Auberges du coeur du Québec (RACQ). Le RAJE citoyenne se veut une réponse
collective à des problèmes d’accès de jeunes adultes à l’aide sociale et aux programmes de
formation ou de retour aux études. Les auteurs décrivent les conditions de possibilité de ce
mouvement « précaire ». Ils s’intéressent également au rôle déterminant du RACQ, initiateur
et soutien principal du RAJE. Ils réfléchissent enfin aux enjeux de structuration de cet
espace de participation citoyenne.
Optimal operation policy of multivessel batch distillation with constant total reflux operation for separation of a binary mixture
Authors: Zhao Shuo , Bai Peng , Tang Ke , Li Guangzhong 
Published: August 2013

ABSTRACTUnlike the past work, the optimal operation policy, which minimizes the total batch time is derived for multivessel batch distillation (MVBD) for separation of binary components under constant total reflux. In this article, both the distribution of vessels along the MVBD column and the holdup in each vessel are optimized to minimize the total batch time. Furthermore, the time consumption of the optimal operation policy is also compared with that of the regular constant reflux operation theoretically and experimentally. The results show that the novel operation mode has great advantages in time saving and easy operation by adopting the optimal operation policy. Thus, for a given separation task, MVBD column reveals significant potential for separation with higher efficiency. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.
Supermolecular morphology of polypropylene filled with nanosized silica
Authors: Schlarb Alois K. , Suwitaningsih Dwi N. , Kopnarski Michael , Niedner‐Schatteburg Gereon 
Published: August 2013

ABSTRACTThe supermolecular morphology of injection‐molded SiO2/polypropylene (PP) nanocomposites was investigated via thin sections analyzed under polarized light and the systematic development of an appropriate etching technique, which allowed the study of the supermolecular morphologies with light microscopy (LM) and high‐resolution field emission scanning electron microscopy (FESEM). In parallel, information regarding the dispersion, distribution state, and morphology of SiO2 particles was investigated via transmission electron microscopy (TEM) and scanning electron microscopy (SEM) of the ion‐polished and fractured surfaces of SiO2‐filled PP. The TEM/SEM results demonstrated an almost homogeneous dispersion and distribution of SiO2 particle agglomerates in the PP matrix. With polarized transmitting LM, reflecting LM, and FESEM, the spherulitic structure of the nanocomposites could be visualized to obtain information on the nanoparticle influence on the crystallization and structural behavior. The size and size distribution of the spherulites analyzed with transmitting light (thin sections) and reflecting light (etched specimens) showed an excellent correlation. With increasing filler loading, the mean size of the spherulites decrease as did the degree of crystallinity. This was a clear indication that the particles acted as nucleation agents and, on the other hand, hindered the arrangement of the molecules during the crystallization. As a result, the particles were most likely located in three areas: the center of the spherulites, the areas between the highly crystalline branches, and the spherulite boundaries. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39655.
Core Cross‐Linked Micelle‐Based Nanoreactors for Efficient Photocatalysis
Authors: Zheng Min , Sun Zaicheng , Xie Zhigang , Jing Xiabin 
Published: August 2013

AbstractStable nanoscale cross‐linked polymer micelles containing Ru complexes (Ru‐CMs) were prepared from monomethoxy[poly(ethylene glycol)]‐block‐poly(L‐lysine) (MPEG‐PLys) and [(bpy)2Ru(fmbpy)](PF6)2 (bpy=bipyridine, fmbpy=5‐formy‐5′‐methyl‐2,2′‐bipyridine). To stabilize the micelles, bifunctional glutaraldehyde was used as a cross‐linker to react with the free amino groups of the PLys block. After that, the Ru‐CMs showed very good stability in common solvents. The Ru‐CMs showed photocatalytic activity and selectivity in the oxidation of sulfides that were as high as those of the well‐known [Ru(bpy)3(PF6)2] complex, because the micelles were swollen in the methanol–sulfide mixture. Moreover, because of the nanoscale size of the particles and their high stability, the Ru‐CM photocatalysts can be readily recovered by ultrafiltration and reused without loss of photocatalytic activity. This work highlights the potential of using cross‐linked micelles as a platform for developing highly efficient heterogeneous photocatalysts for a number of important organic transformations.
President's page
Authors: Dillon Andrew 
Published: August 2013

AbstractEditor's SummaryAs the ASIS&T Board of Directors prepares for the annual planning retreat, critical issues face the organization. Despite the centrality of information in the digital age and the focus, mission and international scope of ASIS&T, the decline in membership numbers since 2000 raises concerns about the association's future and economic sustainability. To survive, professional associations face demands to streamline operations and justify services. The structure and processes of ASIS&T and its effectiveness at serving the professional community must be open to scrutiny. All members are encouraged to offer their thoughts on what works, what drives involvement and how to add value to reinforce ASIS&T's position as the primary association for information professionals.
Tracking citations and altmetrics for research data: Challenges and opportunities
Authors: Konkiel Stacy 
Published: August 2013

AbstractEditor's SummaryMethods for determining research quality have long been debated but with little lasting agreement on standards, leading to the emergence of alternative metrics. Altmetrics are a useful supplement to traditional citation metrics, reflecting a variety of measurement points that give different perspectives on how a dataset is used and by whom. A positive development is the integration of a number of research datasets into the ISI Data Citation Index, making datasets searchable and linking them to published articles. Yet access to data resources and tracking the resulting altmetrics depend on specific qualities of the datasets and the systems where they are archived. Though research on altmetrics use is growing, the lack of standardization across datasets and system architecture undermines its generalizability. Without some standards, stakeholders' adoption of altmetrics will be limited.
Cytotoxic ent‐Kaurane Diterpenoids from Isodon nervosus
Authors: Gao You‐Heng , Wei Zhi‐Xiong , Cheng Yi , Wang Teng‐Hua , Ni Lin , Zhou Xiao‐Hong , Zhang Li‐Yuan 
Published: August 2013

AbstractFour new ent‐kaurane diterpenoids, rabdonervosins G–J (1–4, resp.), were isolated from the leaves and stems of Isodon nervosus. Their structures were elucidated by extensive spectroscopic analyses, including 1D‐, 2D‐NMR and HR mass spectra. Compound 2 showed potent cytotoxicity against the HepG2 and PC‐9/ZD cell lines with IC50 values of 2.36 and 6.07 μM, respectively, and compound 3 exhibited cytotoxicity against the HepG2 and CNE2 cell lines with IC50 values of 8.64 and 9.77 μM, respectively.
Chemotaxonomic Significance of the Terpene Composition in Natural Populations of Pinus nigra J.F.Arnold from Serbia
Authors: Šarac Zorica , Bojović Srdjan , Nikolić Biljana , Tešević Vele , Ðorđević Iris , Marin Petar D. 
Published: August 2013

AbstractThe essential‐oil variability in seven native populations belonging to different infraspecific taxa of Pinus nigra (ssp. nigra, var. gocensis, ssp. pallasiana, and var. banatica) growing wild in Serbia was analyzed. In the needles of 195 trees from seven populations, 58 essential‐oil components were identified. The major components were α‐pinene (43.6%) and germacrene D (29.8%), comprising together 73.4% of the total oil composition. Based on the average chemical profile of the main terpene components (with contents >5%), the studied populations were found to be the most similar to populations from central Italy and Greece (ssp. nigra). Cluster analysis showed the division of the populations into three principal groups: the first group consisted of Populations I, II, III, IV, and V (considered as ssp. nigra group), the second of Population VI (ssp. pallasiana group), and the third of Population VII, which had the most distinct oil composition (ssp. banatica group). The taxonomic implications of the essential‐oil profiles of the investigated taxa of this very complex species are discussed.
Chemopreventive and Antioxidant Activity of the Chamazulene‐Rich Essential Oil Obtained from Artemisia arborescens L. Growing on the Isle of La Maddalena, Sardinia, Italy
Authors: Ornano Luigi , Venditti Alessandro , Ballero Mauro , Sanna Cinzia , Quassinti Luana , Bramucci Massimo , Lupidi Giulio , Papa Fabrizio , Vittori Sauro , Maggi Filippo , Bianco Armanodoriano 
Published: August 2013

AbstractThe essential oils of Artemisia arborescens growing in Sardinia (Italy), collected during three plant growth stages, i.e., from the vegetative stage to post‐blooming time, were characterized. Moreover, the in vitro antiproliferative and antioxidant activities of the oil isolated from aerial parts collected in February were evaluated. The essential oils belonged to the β‐thujone/chamazulene chemotype, notably with the highest amount of chamazulene (ca. 52%) ever detected up to now in the genus Artemisia and, in general, in essential oils. Quantitative variations in the oil composition were observed as the plant passes from the vegetative to the blooming stage. The oil was tested for its potential tumor cell growth‐inhibitory effect on T98G, MDA‐MB 435S, A375, and HCT116 human cell lines, using the MTT (=3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl‐2H‐tetrazolium bromide) assay. The highest activity was observed on A375 and HCT116 cell lines, with IC50 values of 14 μg/ml. Moreover, the in vitro antioxidant and free radical‐scavenging assays revealed the oil to be an effective scavenger of the ABTS radical cation, with an activity comparable to that of Trolox®. These results support the use of A. arborescens oil for the treatment of inflamed skin conditions. Finally, the composition of the polar fraction of the A. arborescens aerial parts was also examined, and the main component detected was 5‐O‐caffeoylquinic acid, which was identified for the first time in this plant.
The Heterogeneous Structural Behavior of E7 from HPV16 Revealed by NMR Spectroscopy
Authors: Calçada Eduardo O. , Felli Isabella C. , Hošek Tomáš , Pierattelli Roberta 
Published: August 2013

AbstractThe E7 protein from human papillomavirus (HPV) plays a key role in oncogenesis; for this reason, it is a target of great biomedical interest. To date, no high resolution information is available for the full protein. We present here the NMR characterization of the entire E7 from HPV16, one of the most oncogenic variants of the virus. The protein is very heterogeneous in terms of structural and dynamic properties with a highly flexible N‐terminal module and a more structured C terminus. This opens possibilities for studies of molecular‐level interactions and post‐translational modifications of the protein to unravel functional details that might be linked to its highly oncogenic potential.
Photochemical Control of DNA Structure through Radical Disproportionation
Authors: San Pedro Joanna Maria N. , Greenberg Marc M. 
Published: August 2013

AbstractPhotolysis of an aryl sulfide‐containing 5,6‐dihydropyrimidine (1) at 350 nm produces high yields of thymidine and products resulting from trapping of a 5,6‐dihydrothymidin‐5‐yl radical by O2 or thiols. Thymidine is believed to result from disproportionation of the radical pair originally generated from CS bond homolysis of 1 on the microsecond timescale, which is significantly shorter than other photochemical transformations of modified nucleotides into their native forms. Duplex DNA containing 1 is destabilized, presumably due to disruption of π‐stacking. Incorporation of 1 within the binding site of the restriction endonuclease EcoRV provides a photochemical switch for turning on the enzyme's activity. In contrast, 1 is a substrate for endonuclease VIII and serves as a photochemical off switch for this base excision repair enzyme. Modification 1 also modulates the activity of the 10–23 DNAzyme, despite its incorporation into a nonduplex region. Overall, dihydropyrimidine 1 shows promise as a tool to provide spatiotemporal control over DNA structure on the miscrosecond timescale.
Optimizing Nanoscale TiO2 for Adsorption‐Enhanced Photocatalytic Degradation of Low‐Concentration Air Pollutants
Authors: Lyu Jinze , Zhu Lizhong , Burda Clemens 
Published: August 2013

AbstractAdsorption and photodegradation are key steps in environmental air purification. Micropores have been introduced into anatase TiO2 nanocatalysts to enhance the adsorption of pollutant molecules onto the photocatalyst surface, which increases the use of the photoinduced electron–hole pairs. Three nanocomposites have been synthesized with dodecylamine as a pore‐forming agent under mild hydrothermal conditions and at varying temperature of preparation. Samples synthesized at 100, 115, and 130 °C, labeled TiO2‐100, TiO2‐115, and TiO2‐130, respectively, provided insights into the effect of crystallinity and micropore area on the removal efficiency of gas‐phase organic pollutants. Of the three, TiO2‐100 had the largest micropore area (493 m2 g−1) but amorphous phase. TiO2‐130 had anatase phase but only mesopores, whereas TiO2‐115 had both a relatively large micropore area (258 m2 g−1) and an anatase crystal structure. Toluene was chosen as a model air pollutant. Experiments were performed in a single‐pass reactor in the presence of UV irradiation under various experimental conditions, such as varying partial pressures of toluene, contact times, and relative humidities of the mobile gas phase, to approximate realistic conditions for this air purification system. Of the three prototype catalysts, TiO2‐115 showed the highest removal and mineralization efficiencies owing to the optimized availability of photogenerated holes and adsorbed toluene. The key parameters for optimized photocatalysis of low‐concentration air pollutants are the micropore area and the crystallinity of the photocatalyst.
EthylenedithioTetrathiafulvaleneHelicenes: Electroactive Helical Precursors with Switchable Chiroptical Properties
Authors: Biet Thomas , Fihey Arnaud , Cauchy Thomas , Vanthuyne Nicolas , Roussel Christian , Crassous Jeanne , Avarvari Narcis 
Published: August 2013

AbstractElectroactive fused ethylenedithiotetrathiafulvalene[4]helicene and ‐[6]helicenes have been synthesized through a strategy that involved the preparation of 2,3‐dibromo‐helicene derivatives as intermediates. The dihedral angles between the terminal helicenes, as determined by single‐crystal X‐ray analysis, are 22.7° and 50.7° for the [4]helicene and [6]helicene, respectively. Their solid‐state architectures show interplay between S⋅⋅⋅S and π⋅⋅⋅π intermolecular interactions. The chiroptical properties of the enantiopure EDTTTF[6]helicene derivatives have been investigated and supported by TDDFT calculations. Remarkable redox switching of the circular dichroism (CD) signal between the neutral and radical‐cation species has been achieved.
Tunable Self‐Assembly of Triazole‐Linked Porphyrin–Polymer Conjugates
Authors: Roberts Derrick A. , Schmidt Timothy W. , Crossley Maxwell J. , Perrier Sébastien 
Published: August 2013

AbstractThe convergence of supramolecular chemistry and polymer science offers many powerful approaches for building functional nanostructures with well‐defined dynamic behaviour. Herein we report the efficient “click” synthesis and self‐assembly of AB2‐ and AB4‐type multitopic porphyrin–polymer conjugates (PPCs). PPCs were prepared using the copper(I)‐catalysed azide–alkyne cycloaddition (CuAAC) reaction, and consisted of linear polystyrene, poly(butyl acrylate), or poly(tert‐butyl acrylate) arms attached to a zinc(II) porphyrin core via triazole linkages. We exploit the presence of the triazole groups obtained from CuAAC coupling to direct the self‐assembly of the PPCs into short oligomers (2–6 units in length) via intermolecular porphyrinatozinc–triazole coordination. By altering the length and grafting density of the polymer arms, we demonstrate that the association constant of the porphyrinatozinc–triazole complex can be systematically tuned over two orders of magnitude. Self‐assembly of the PPCs also resulted in a 6 K increase in the glass transition temperature of the bulk material compared to a non‐assembling PPC. The modular synthesis and tunable self‐assembly of the triazole‐linked PPCs thus represents a powerful supramolecular platform for building functional nanostructured materials.
Synthesis and Biological Activity of 7,8,9‐Trideoxy‐ and 7R DesTHP‐Peloruside A
Authors: Wullschleger Christoph W. , Gertsch Jürg , Altmann Karl‐Heinz 
Published: August 2013

AbstractThe stereoselective syntheses of 7,8,9‐trideoxypeloruside A (4) and a monocyclic peloruside A analogue lacking the entire tetrahydropyran moiety (3) are described. The syntheses proceeded through the PMB‐ether of an ω‐hydroxy β‐keto aldehyde as a common intermediate which was elaborated into a pair of diastereomeric 1,3‐syn and ‐anti diols by stereoselective Duthaler–Hafner allylations and subsequent 1,3‐syn or anti reduction. One of these isomers was further converted into a tetrahydropyran derivative in a high‐yielding Prins reaction, to provide the precursor for bicyclic analogue 4. Downstream steps for both syntheses included the substrate‐controlled addition of a vinyl lithium intermediate to an aldehyde, thus connecting the peloruside side chain to C15 (C13) of the macrocyclic core structure in a fully stereoselective fashion. In the case of monocyclic 3 macrocyclization was based on ring‐closing olefin metathesis (RCM), while bicyclic 4 was cyclized through Yamaguchi‐type macrolactonization. The macrolactonization step was surprisingly difficult and was accompanied by extensive cyclic dimer formation. Peloruside A analogues 3 and 4 inhibited the proliferation of human cancer cell lines in vitro with micromolar and sub‐micromolar IC50 values, respectively. The higher potency of 4 highlights the importance of the bicyclic core structure of peloruside A for nM biological activity.
Synthesis of Zwitterionic Cobaltocenium Borate and Borata‐alkene Derivatives from a Borole‐Radical Anion
Authors: Bauer Jürgen , Braunschweig Holger , Hörl Christian , Radacki Krzysztof , Wahler Johannes 
Published: August 2013

AbstractChemical single‐electron reduction of 1‐mesityl‐2,3,4,5‐tetraphenylborole (3) gave a stable radical anion [CoCp*2][3] as shown in earlier investigations. Herein, we present the reaction of [CoCp*2][3] with the 2,2,6,6‐tetramethylpiperidine‐N‐oxyl radical (TEMPO), a common radical trap. Instead of radical recombination, the reaction proceeds through a redox pathway involving oxidation of the borole radical anion combined with reduction of TEMPO. This electron‐transfer process is accompanied by a deprotonation reaction of the cobaltocenium counterion by the base TEMPO− to give TEMPO‐H and a neutral cobalt(I) fulvene complex (7). The latter was not observed directly during the reaction, because it instantaneously reacts as a nucleophile attacking at the boron center of the in situ generated borole 3 to give the borate 6. However, 7 was synthesized independently by deprotonation of [CoCp*2][PF6]. In addition, the obtained zwitterionic cobaltocenium borate 6 undergoes a photolytic rearrangement to form the borata‐alkene derivative 9 that thermally transforms to the chiral cobaltocenium borate 12. Our investigations are based on spectroscopic evidence, X‐ray crystallography, elemental analysis, as well as DFT calculations.