bluuebunny/crossref_metadata_2025_split huggingface dataset:
Récit de tournage : le documentaire comme méthode de recherche-action
Authors: Charlebois François-Xavier 
Published: July 2019

La problématique sociale du raccrochage scolaire fait l’objet de peu d’attention de la part des chercheurs (Voyer, Potvin et Bourdon, 2014). Les recherches menées de l’intérieur à partir de la parole des acteurs concernés par la problématique sont d’autant plus rares. En 2012, le réseau de recherche-action PARcours, coordonné par Danielle Desmarais, professeure à l’École de travail social de l’Université du Québec à Montréal, a produit un long métrage documentaire réalisé par Jonathan Durand. Ce film, intituléL’école pour moi, consigne les récits de vie de 14 jeunes provenant de quatre pays (Canada [Québec], France, Belgique et Espagne). Cet article présente les prémisses épistémologiques de notre production et propose une réflexion sur le potentiel du documentaire comme outil de recherche-action. L’usage de la vidéo révèle un fort potentiel de développement de réflexivité pour les jeunes ayant travaillé à mettre leur vie en récit devant la caméra. Deuxièmement, le film constitue un outil important pour la formation de futurs pédagogues et pour l’accompagnement de jeunes en situation de raccrochage scolaire. Troisièmement, la méthode dugo-alongque nous avons employée révèle, pour les scientifiques, un fort potentiel en ce qui a trait à la production de données originales et complémentaires à des méthodes d’entretien biographique formel. Ces méthodes et les retombées observées rendent compte du dynamisme de la recherche-action dans les disciplines pratiques comme le travail social et l’éducation.
Expérience acoustique et pratiques musicales de musiciens de métro
Authors: Wees Nick , Paré-Beauchemin Sophie , Fournier Robert 
Published: July 2019

Dans cet article, j’examine l’expérience acoustique des espaces souterrains du métro de Montréal et j’expose les pratiques et perceptions des musiciens qui performent dans cet environnement. Je considère comment les caractéristiques acoustiques particulières qui distinguent les espaces souterrains des espaces en surface influencent les relations coproductives qu’ont les gens avec ces espaces. Les musiciens ambulants qui performent dans le réseau du métro doivent composer avec les contraintes et les possibilités posées par les caractéristiques matérielles de ces lieux – surtout en matière d’acoustique – ainsi qu’avec la réglementation en vigueur et les normes sociales dominantes. Les musiciens de métro font preuve de tactiques fort variables et improvisées dans le cadre de leurs pratiques musicales et spatiales. Bien qu’elles puissent muter alors qu’elles sont liées à des caractéristiques personnelles et spatiales singulières, ces pratiques sont somme toute assez durables et cohésives pour être qualifiées d’acte d’agencement, une réalité qui démontre la nature coproductive du corps et de l’espace. Enfin, je suggère un parallèle entre les pratiques de nature technologique des musiciens de rue et la production audiovisuelle réalisée dans le cadre de ma recherche, deux éléments qui soulignent la relationnalité du corps et de l’espace ainsi que le rôle participatif d’agents matériels dans l’expérience sensorielle.
Crop Growth and Productivity of Rainy Maize-garden Pea Copping Sequence as Influenced by Kappaphycus and Gracilaria Saps at Alluvial Soil of West Bengal, India
Authors: Garai Sourav , Brahmachari Koushik , Sarkar Sukamal , Kundu Rajib , Pal Mriganka , Pramanick Biswajit 
Published: July 2019

Aim: Cereal-legume cropping system has been proved to be one of the best alternatives for a productive as well as profitable farming in West Bengal. Maize is an important cereal crop which is widely grown during rainy (kharif) season throughout the State. While garden pea, a short duration winter (rabi) season vegetable, can easily fit in any existing cereal-legume cropping system. The present nutrient management strategies solely relay on NPK based chemical fertilizer application which results in the gradual deterioration in soil physical and chemical properties and stagnant crop yield. To maximize production level by spraying extracts of natural products that contain stimulants, is a strategic move to overcome the ill effects of the use of excessive doses of inorganic fertilizer.
Methodology: The present field experiment was conducted in Nadia district, West Bengal during rainy and winter season of 2016-17 and 2017-18 to assess the impact of seaweed extracts on crop growth and productivity under maize-garden pea cropping sequence. There were four concentrations of Kappaphycus seaweed sap (K-sap) (5.0 and 10%); two concentrations of GA3 free K-sap (5.0 and 10%); two concentrations of Gracillaria seaweed sap (G-sap) (5.0 and 10%) and a control [Recommended dose (RD) of NPK only].
Results: Experimental results revealed that the foliar application of K-sap (10%) along with RD of NPK resulted in an impressive performance of both the crops in terms of growth (plant height, biomass, crop growth rate), yield attributes and yield, which was closely, followed G sap (10%). Throughout the growth period of garden pea, plants received recommended dose of fertilizer supplemented with K-sap at 10% concentration recorded significantly highest biomass production (56.94, 170.02 and 309.37 g m-2 respectively).
Conclusion: This may be concluded that the foliar application of 10% K-sap along with RD of NPK can be recommended for maize-garden pea cropping sequence.
Effects of Gamma Rays on Cocona (Solanum sessiliflorum Dunal)
Authors: Ticona-Benavente César Augusto , Andrade Adria Santos , Batista Manoel Ronaldo Aguiar , Filho Danilo Fernandes da Silva 
Published: July 2019

Harvesting hairy fruits of current cocona (Solanum sessiliflorum Dunal) is a painful task because the hair is itching. Therefore, growers would be interested in hairless fruit type planting materials. Breeding for this character depends on the amount of genetic variety present within the species. In the case of limited genetic variability occurring naturally, one can be created using mutagenic agents. Gamma rays were used in the course of the present study on cocona seeds of genotype CUB-08 at 100, 150, 200, 300 and 400 Gy. Irradiated seeds were sown in styrofoam seedling trays, then transplanted in the open field, three months later, following a randomized block design with four replications and seven plants per plot, in the Agricultural experimental station of the National Institute for Amazonian Research (Instituto Nacional de Pesquisas da Amazônia).
The 100 and 150 Gy radiations led to germinating vigor and fruit pilosity variability whereas 200 Gy decreased the germination rate, and 300 and 400 Gy were totally deleterious. Therefore, gamma rays 100-150 Gy could be used to enhance genetic diversity for fruit pilosity and for fruit number as well.
Erg mediates downregulation of claudin‐5 in the brain endothelium of a murine experimental model of cerebral malaria
Authors: Liu Fuhong , Liu Qiang , Yuan Fangshu , Guo Shuling , Liu Jinzhi , Sun Zongguo , Gao Peng , Wang Yu , Yan Suhua , Liu Ju 
Published: July 2019

Cerebral malaria (CM) is a severe complication with brain vascular hyperpermeability. Claudin‐5 is the major component of tight junctions. To investigate the expression of claudin‐5 in CM, we established a murine experimental cerebral malaria (ECM) model and an in vitro model by treating murine brain endothelial cells (bEnd3) with plasma from ECM mice. Expression of claudin‐5 and the ETS transcription factor Erg was reduced in the brain endothelium of ECM mice. In bEnd3 cells exposed to ECM plasma, decreased expression of claudin‐5 and Erg, and increased permeability were observed. Silencing of Erg significantly reduced Cldn5 expression. ChIP assays indicated that Erg binds to the −813 ETS motif of the murine Cldn5 gene promoter, and the binding is decreased by treatment with ECM plasma.
Reduced Ovarian Function in Female Rheumatoid Arthritis Patients Trying to Conceive
Authors: Brouwer Jenny , Dolhain Radboud J. E. M. , Hazes Johanna M. W. , Visser Jenny A. , Laven Joop S. E. 
Published: July 2019

ObjectiveSubfertility, a time to pregnancy (TTP) longer than 12 months, is present in 40% of female patients with rheumatoid arthritis (RA) who are actively trying to conceive. Because patients with RA appear to reach menopause at a younger age, diminished ovarian function may explain the reduced fertility. Serum anti‐Müllerian hormone (AMH) levels are the best proxy to measure ovarian function. Our objectives were to study AMH levels in female patients with RA and determine the association of preconception serum AMH levels with TTP.MethodsA post hoc analysis was performed before conception in patients of the Pregnancy‐Induced Amelioration of Rheumatoid Arthritis (PARA) cohort. Serum AMH levels were compared with those in an existing cohort of healthy controls using analysis of covariance. Associations between AMH and TTP were studied using the Cox proportional hazard analysis.ResultsPreconception serum was available in 209 women of the PARA cohort (aged 32.1 ± 3.9 years), of whom 45% were subfertile in the current episode. The median AMH level was 2.5 μg/l (interquartile range: 1.5‐4.6). AMH levels were significantly lower compared with those in healthy controls (P < 0.001), with 17% of patients having levels below the age‐specific 10th percentile. A multivariable analysis showed a negative association of AMH with the presence of anticitrullinated protein antibodies (ACPAs) (P = 0.009). AMH levels showed no significant association with TTP (P = 0.26).ConclusionWomen with RA have lower AMH levels than healthy controls, and AMH levels were lower in ACPA‐positive patients. However, because preconception AMH levels were not associated with TTP, the reduced AMH levels do not explain the reduced fertility in patients with RA.
Influence of Electron Acceptor and Electron Donor on the Photophysical Properties of Carbon Dots: A Comparative Investigation at the Bulk‐State and Single‐Particle Level
Authors: Srivastava Indrajit , Khamo John S. , Pandit Subhendu , Fathi Parinaz , Huang Xuedong , Cao Anleen , Haasch Richard T. , Nie Shuming , Zhang Kai , Pan Dipanjan 
Published: July 2019

AbstractCarbon dots (CDs) are extensively studied to investigate their unique optical properties such as undergoing electron transfer in different scenarios. This work presents an in‐depth investigation to study the ensemble‐averaged state/bulk state and single‐particle level photophysical properties of CDs that are passivated with electron‐accepting (CD‐A) and electron‐donating molecules (CD‐D) on their surface. The bulk‐state experiments reveal that in a mixture of these CDs, CD‐A dominates the overall photophyiscal properties and eventually leads to formation of at least two associated geometries, which is dependent on time, concentration, intramolecular electron/charge transfer, and hydrogen bonding. Single‐particle studies, however, do not reveal an “acceptor‐dominating” scenario based on analysis of instantaneous intensity, bleaching kinetics, and photoblinking, indicating that the direct interaction of these CDs may affect their photophysical properties in the bulk state due to formation of hierarchical structural assemblies. Here it is anticipated that these fundamental results will further provide insights toward the understanding of the complex mechanism associated with CD emission, which is one of the key contributors to their successful application. As an immediate application of these functional CDs, it is shown that they can be used as a sensing array for metal ions and serve as a powerful toolbox for their technological applications.
Unveiling the Nanoparticle‐Seeded Catalytic Nucleation Kinetics of Perovskite Solar Cells by Time‐Resolved GIXS
Authors: Lin Chung‐Yao , Li Shao‐Sian , Chang Je‐Wei , Chia Hao‐Chung , Hsiao Yu‐Yun , Su Chun‐Jen , Lian Bing‐Jun , Wen Cheng‐Yen , Huang Shao‐Ku , Wu Wei‐Ru , Wang Di‐Yan , Su An‐Chung , Chen Chun‐Wei , Jeng U‐Ser 
Published: July 2019

AbstractRecently, a new seeding growth approach for perovskite thin films is reported to significantly enhance the device performance of perovskite solar cells. This work unveils the intermediate structures and the corresponding growth kinetics during conversion to perovskite crystal thin films assisted by seeding PbS nanocrystals (NCs), using time‐resolved grazing‐incidence X‐ray scattering. Through analyses of time‐resolved crystal formation kinetics obtained from synchrotron X‐rays with a fast subsecond probing time resolution, an important “catalytic” role of the seed‐like PbS NCs is clearly elucidated. The perovskite precursor‐capped PbS NCs are found to not only accelerate the nucleation of a highly oriented intermediate phase, but also catalyze the conversion of the intermediate phase into perovskite crystals with a reduced activation energy Ea = 47 (±5) kJ mol−1, compared to 145 (±38) kJ mol−1 for the pristine perovskite thin film. The reduced Ea is attributed to a designated crystal lattice alignment of the perovskite nanocrystals with perovskite cubic crystals; the pivotal heterointerface alignment of the perovskite crystals coordinated by the Pb NCs leads to an improved film surface morphology with less pinholes and enhanced crystal texture and thermal stability. These together contribute to the significantly improved photovoltaic performance of the corresponding devices.
Encoded Microneedle Arrays for Detection of Skin Interstitial Fluid Biomarkers
Authors: Zhang Xiaoxuan , Chen Guopu , Bian Feika , Cai Lijun , Zhao Yuanjin 
Published: July 2019

AbstractSkin interstitial fluid (ISF) is considered as an emerging source of biomarkers with physiological and medical significance. Microneedle arrays (MNs) provide a promising means for painless, noninvasive detection of these biomarkers. Here, novel MNs integrated with photonic crystal (PhC) barcodes are presented, and multiplex specific detection of ISF biomarkers is realized for the first time. The PhC barcodes‐loaded flexible MNs are simply fabricated by replicating dynamic ferrofluid‐cast micromoldings. When the prepared MNs are inserted into skin, they can enrich specific biomarkers to their probes‐decorated PhC barcodes. Thus, by adding corresponding fluorescent probes to form sandwich immunocomplexes, the relative content of the biomarkers can be read out through the fluorescence intensity of the barcodes; meanwhile, the species of these biomarkers can be clearly distinguished by the reflection peaks of the PhC barcodes. Based on the encoded MNs, their sensitivity, flexibility, and versatility of capturing and detecting three inflammatory cytokines are demonstrated in a sepsis mice model. Compared with existing MNs for ISF detection, the encoded MNs not only possess equivalent detection effects with less post‐processing and simplified procedures, but can also detect multiple biomarkers simultaneously, which makes them ideal in many clinical and biomedical detection areas.
Printable Ta Substrate with High Stability and Enhanced Interface Adhesion for Flexible Supercapacitor Performance Improvement
Authors: Zhang Yupu , Wang Lili , Cai Dong , Li La , Li Junzhi , Chen Duo , Cao Junming , Dai Xiaohang , Han Wei 
Published: July 2019

AbstractThe existence of supercapacitors with a long calendar life, a superior power density, and a higher mechanical stability is increasingly drawing attention due to their viability to be used as power sources onboard wearable electronics. However, a considerable issue is that upon repeated cycling, an unstable interface between the conducting substrate and the active materials leads to low conductivity and overall poor device performance, thereby hindering its practical applications. Tantalum foil is a potential substrate which can be used in the fabrication of supercapacitors; it has strong corrosion resistive properties, good bendability, and is mechanically stable. These properties make it suitable for use in supercapacitors. Here, a printable tantalum foil substrate with printed carbon particles on its surface is described, showing high adhesion and a greatly improved interface for the fabrication of traditional activated carbon film based supercapacitors. The flexible solid‐state supercapacitors with this printable substrate achieve a higher volumetric capacitance, outstanding energy density, a higher power density, and provide excellent mechanical flexibility. These results indicate that the strategy to use a printable substrate with an enhanced adhesion interface provides an alternative method to achieve highly stable and highly efficient supercapacitors which are ideal to be used in portable devices and flexible electronics.
Efficient C−S Bond Formation by Direct Functionalization of C(sp3)−H Bond Adjacent to Heteroatoms under Metal‐Free Conditions
Authors: Zhao Feng , Tan Qi , Wang Dahan , Chen Jinjin , Deng Guo‐Jun 
Published: July 2019

AbstractA simple and efficient method for the formation of C−S bond via direct functionalization of C(sp3)−H bond adjacent to heteroatoms was described under metal‐free conditions. In this work, stable and easily accessible sodium sulfinates were used as the thiolating agents to afford various aryl thioethers in moderate to excellent yields. Mechanistic explorations show that a radical pathyway is possibly involved during the transformations.magnified image
Efficiency Enhancement with the Ferroelectric Coupling Effect Using P(VDF‐TrFE) in CH3NH3PbI3 Solar Cells
Authors: Jia Endong , Wei Dong , Cui Peng , Ji Jun , Huang Hao , Jiang Haoran , Dou Shangyi , Li Meicheng , Zhou Chunlan , Wang Wenjing 
Published: July 2019

AbstractA novel ferroelectric coupling photovoltaic effect is reported to enhance the open‐circuit voltage (VOC) and the efficiency of CH3NH3PbI3 perovskite solar cells. A theoretical analysis demonstrates that this ferroelectric coupling effect can effectively promote charge extraction as well as suppress combination loss for an increased minority carrier lifetime. In this study, a ferroelectric polymer P(VDF‐TrFE) is introduced to the absorber layer in solar cells with a proper cocrystalline process. Piezoresponse force microscopy (PFM) is used to confirm that the P(VDF‐TrFE):CH3NH3PbI3 mixed thin films possess ferroelectricity, while the pure CH3NH3PbI3 films have no obvious PFM response. Additionally, with the applied external bias voltages on the ferroelectric films, the devices begin to show tunable photovoltaic performance, as expected for the polarization in the poling process. Furthermore, it is shown that through the ferroelectric coupled effect, the efficiency of the CH3NH3PbI3‐based perovskite photovoltaic devices is enhanced by about 30%, from 13.4% to 17.3%. And the open‐circuit voltages (VOC) reach 1.17 from 1.08 V, which is reported to be among the highest VOCs for CH3NH3PbI3‐based devices. It should be noted in particular that the thickness of the layer is less than 160 nm, which can be regarded as semi‐transparent.
Prevalence of low back pain in migrant construction workers in Mar del Plata, Argentina
Authors: Machado Susseret Nestor , Briceno‐Ayala Leonardo , Radon Katja 
Published: July 2019

AbstractBackgroundWe aimed to compare employment conditions, psychosocial working conditions, and prevalence of low back pain among migrant and local construction workers in Argentina.MethodsIn a cross‐sectional study among workers from three contracting and eight subcontracting companies as well as 26 construction sites in the region of Buenos Aires, Argentina, 134 out of 150 local (89% response) and 141 out of 150 migrant construction workers (94% response) answered a validated questionnaire. Psychosocial working conditions were evaluated based on an imbalance between efforts and rewards (ERI).ResultsCompared to local workers, migrants were younger, more likely to work without a contract (57% vs 8%), to report ERI (81% vs 18%) and to suffer from low back pain during the 7‐days before study (80% vs 42%) (all P < .0001). After mutual adjustment, being a migrant (prevalence ratio 2.1; 95% confidence interval [CI] 1.4‐3.0) and working without a contract (1.7; 95% CI, 1.4‐2.1) were statistically significant risk factors for low back pain.ConclusionsThis study describes the precarious situation of migrant workers in the Argentinian construction industry and the potential health consequences. Provision of formal employment relations might help to better protect migrant workers’ safety and health. Prospective studies are needed to assess the causes and effects of the findings we describe.
Cross‐Coupling Reaction of Dimer‐Derived Persistent Tertiary‐Carbon‐Centered Radicals with Azo Compounds
Authors: Ohnishi Rikako , Sugawara Masumi , Akakabe Mai , Ezawa Tetsuya , Koshino Hiroyuki , Sohtome Yoshihiro , Sodeoka Mikiko 
Published: July 2019

AbstractCross‐coupling reactions using tertiary carbon‐centered radicals are an important class of transformations for constructing C(sp3)−C(sp3) bonds, but the use of dimers as precursors of the persistent radicals is quite rare. Herein, we describe a radical‐based cross‐coupling reaction between dimers (prepared from 2‐oxindoles and benzofuranones) and azo compounds that proceeds simply upon heating the reaction mixture. We present a conformational analysis of the dimers and we characterize the generation of a persistent radical via cleavage of the elongated C(3)−C(3’) σ‐bond. The behavior of the dimers in solution was characterized by spectroscopic analysis, helping to provide a basis for expanding the substrate scope of the cross‐coupling reaction.
Interleukin 9 alterations linked to alzheimer disease in african americans
Authors: Wharton Whitney , Kollhoff Alexander L. , Gangishetti Umesh , Verble Danielle D. , Upadhya Samsara , Zetterberg Henrik , Kumar Veena , Watts Kelly D. , Kippels Andrea J. , Gearing Marla , Howell J. Christina , Parker Monica W. , Hu William T. 
Published: July 2019

ObjectiveCompared to older Caucasians, older African Americans have higher risks of developing Alzheimer disease (AD) and lower cerebrospinal fluid (CSF) tau biomarker levels. It is not known whether tau‐related differences begin earlier in life or whether race modifies other AD‐related biomarkers such as inflammatory proteins.MethodsWe performed multiplex cytokine analysis in a healthy middle‐aged cohort with family history of AD (n = 68) and an older cohort (n = 125) with normal cognition (NC), mild cognitive impairment, or AD dementia. After determining baseline interleukin (IL)‐9 level and AD‐associated IL‐9 change to differ according to race, we performed immunohistochemical analysis for proteins mechanistically linked to IL‐9 in brains of African Americans and Caucasians (n = 38), and analyzed postmortem IL‐9–related gene expression profiles in the publicly available Mount Sinai cohort (26 African Americans and 180 Caucasians).ResultsCompared to Caucasians with NC, African Americans with NC had lower CSF tau, p‐Tau181, and IL‐9 levels in both living cohorts. Conversely, AD was only correlated with increased CSF IL‐9 levels in African Americans but not Caucasians. Immunohistochemical analysis revealed perivascular, neuronal, and glial cells immunoreactive to IL‐9, and quantitative analysis in independent US cohorts showed AD to correlate with molecular changes (upstream differentiation marker and downstream effector cell marker) of IL‐9 upregulation only in African Americans but not Caucasians.InterpretationBaseline and AD‐associated IL‐9 differences between African Americans and Caucasians point to distinct molecular phenotypes for AD according to ancestry. Genetic and nongenetic factors need to be considered in future AD research involving unique populations. ANN NEUROL 2019;86:407–418