bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrated Petrographic, Mineralogical, and Geochemical Study of the Upper Kaimur Group of Rocks, Son Valley, India: Implications for Provenance, Source Area Weathering and Tectonic Setting
Authors: Quasim M. A. , Khan Imran , Ahmad A. H. M. 
Published: October 2017

ABSTRACT
The upper Kaimur Group (UKG) of the Vindhyan Supergroup in central India, primarily consists of three rock types-Dhandraul sandstone, Scarp sandstone and Bijaigarh shale. The present study aims to reconstruct the parent rock assemblages, their tectonic provenance, mineralogy, weathering intensity, hydraulic sorting and depositional tectonic setting. Samples from the UKG rocks representing the Dhandraul sandstone, Scarp sandstone and Bijaigarh shale were studied using a combination of petrographic, mineralogical, and geochemical techniques. Texturally, medium to coarse grained UKG sandstones are mature and moderate to well sorted. Deficiency of feldspars in these sandstones indicates that the rocks are extensively recycled from distant sources. Their average modal composition for Scarp (avg. Qt99F0.2L0.8) and Dhandraul (avg. Qt99 F0.1L0.8) sandstones, classifies them as quartz arenite to sub-litharenite types, which is consistent with geochemical study. Major element concentrations revealed that sandstones have high SiO2, K2O &gt; Na2O, and low Fe2O3, which are supported by the modal data. On the other hand, sandstone samples are enriched in most trace elements such as Ce, Sr, V, Sc and Zr and depleted in U and Th. The CIA values (43.17-76.48) of the UKG rocks indicate low to moderate weathering, either of the original source or during transport before deposition, which may have related to low-relief and humid climatic conditions in the source area. Further, petrographic and geochemical interpretations indicate that they are derived from craton interior to quartzose recycled sedimentary rocks and deposited in a passive continental margin. Therefore, granitic and low grade metamorphic rocks of Mahakoshal Group and Chotanagpur granite-gneiss, situated on the southern and south-eastern side of the Vindhyan basin are suggested as possible provenance for the UKG rocks.
Depositional Conditions, Characteristics and Source of Rare Earth Elements in Carbonate Strata of the Albian Asu River Group, Middle Benue Trough, North Central Nigeria
Authors: Idakwo S. O. 
Published: October 2017

ABSTRACT
Major, trace and rare earth elements (REE) concentrations in limestone beds of the Asu River Group within the Middle Benue Trough were measured to understand the depositional conditions, characteristics and source of REE. The limestone has high content of CaO (Average of 46.55%), followed by SiO2 (Average of 7.90 %), Fe2O3(t), MgO and Al2O3. The limestones are depleted in most of the trace elements (Co, V, Rb, Ba, Zr, Y, Nb, Hf and Th) when compared with the Post-Archean Australian Shale (PAAS). The observed large variations in ΣREE contents among various limestones of the present study (12.22 to 142.53ppm) are mainly due to the amount of terrigenous matter present in them. The characteristics of non-seawater-like REE patterns, elevated REE concentrations, high LaN/YbN ratios and low Y/Ho ratios, suggest that the observed variations in ΣREE contents are mainly controlled by the amount of detrital sediments in the limestones of the Asu River Group in the middle Benue trough. The observed variations in Ce contents and Ce anomalies in the studied samples resulted from detrital input. The limestones show positive Mn* values (0.30 to 0.78) and low contents of U (∼0.60-3.20 ppm) suggesting that they were deposited under oxygen-rich environment.
Determinants of compulsive buying behavior among young adults: The mediating role of materialism
Authors: Islam Tahir , Wei Jiuchang , Sheikh Zaryab , Hameed Zahid , Azam Rauf I. 
Published: October 2017

ABSTRACTThis research seeks to determine what makes young adults materialistic. The study examines the mediating role of materialism between the contextual factors and compulsive buying. Data was gathered from 219 Pakistani undergraduate university students. Partial Least Square (PLS) technique was used to analyze the data. The study confirms the intuition that more materialistic young adults are more likely to be involved in compulsive buying than are less materialistic young adults. The results were similar with the previous literature conducted in the western culture, indicating that also applies in a modern Islamic society. The findings of the study reveal that materialism mediated the relationship between certain sociological factors (i.e., group, media Celebrity endorsement, and TV advertisement) and compulsive buying. The study highlights the importance of understanding young adults' materialistic attitudes and consumption decisions and provides key knowledge for researchers, policymakers, and managers of leading brands.
An Examination of Tail Dependence in Bordeaux Futures Prices and Parker Ratings
Authors: Cyr Don , Kwong Lester , Sun Ling 
Published: October 2017

AbstractThis paper explores the nonlinearities of the bivariate distribution of Bordeauxen primeur, or wine futures, prices and Parker “barrel ratings” for the period of 2004 through 2010. In particular, copula-function methodology is introduced and employed to examine the nature of the bivariate distribution. Our results show a significant nonlinear relationship between Parker ratings and wine prices, characterized by significant positive tail dependence and higher correlation between high ratings and high prices. Marginal distributions for Parker ratings and wine prices are then identified and Monte Carlo simulation is employed to operationalize the relationship for risk-management purposes. (JEL Classifications: C19, G13, L66)
Kindness toward One’s Self and Body: Exploring Mediational Pathways between Early Memories and Disordered Eating
Authors: Ferreira Cláudia , Oliveira Sara , Mendes Ana Laura 
Published: October 2017

AbstractRecent literature has emphasized the role played by early emotional experiences on body image and eating-related psychopathology. Nevertheless, the mechanisms underlying the link between positive rearing experiences and eating psychopathology remain scarcely explored. Thus, this study aimed to explore a model in which it was hypothesized that early emotional experiences, characterized by warmth, safeness, and soothing, are negatively associated with disordered eating through higher levels of self-compassion and a more positive and caring relationship with one’s own body. The study’s sample comprised 490 women who completed an Internet based survey comprising self-report measures of interest. Path analysis’ results revealed that self-compassion and body appreciation fully mediated the impact of early positive emotional memories on eating psychopathology, when controlling the effect of age and Body Mass Index. The plausibility of the path model was examined by the Chi-Square and the several fit indicators which revealed a very good fit, accounting for 49% of eating psychopathology’s variance. Specifically, results demonstrated that 13% of self-compassion’s variance was explained by positive early emotional memories. Also, early positive memories showed both direct and indirect (via self-compassion) positive effects on body appreciation, accounting for 34% of its variance. Additionally, results revealed that positive early emotional experiences predicted lower levels of disordered eating, via higher levels of self-compassion and body appreciation. By emphasizing the importance role of self-compassion and body appreciation against body image and eating psychopathology, the current study may offer important insights for future research and for the development of intervention programs.
The Appraisal of Self-Care Agency Scale - Revised (ASA-R): Adaptation and Validation in a Sample of Spanish Older Adults
Authors: Alhambra-Borrás Tamara , Durá-Ferrandis Estrella , Garcés-Ferrer Jorge , Sánchez-García Javier 
Published: October 2017

AbstractSelf-care agency is an important determinant of healthy aging. The Appraisal of Self-care Agency Scale (ASA-R) (Sousa et al., 2010) is one of the main instrument to assess self-care capacity. The objectives of the study were: 1) to adapt and validate ASA-R scale for use in Spanish population; 2) to examine the dimensionality, validity and reliability; 3) and to establish the convergent validity of ASA-R using a self-reported health measure. The ASA-R Scale and the 12-item Short Form Health Survey (SF-12) were administered to 488 Spanish seniors aged 65 and over. Confirmatory Factor Analysis (CFA) was used to analyze the dimensionality, validity and reliability. Convergent validity was tested by correlating the ASA-R factors with the SF-12 subscales; correlations were significant (p < .005). CFA showed that the ASA-R Three Factor Model fit well to the data, showing satisfactory fit indices, with S-Bχ2 > 0.05 (0.436), RMSEA closer to 0 (0.006), SRMR < 0.08 (0.065), GFI and AGFI close to 1 (0.924 and 0.921), and CFI and NNFI > 0.95 (0.996 and 0.995). The results also demonstrated that ASA-R is a reliable and valid instrument. The ASA-R has demonstrated to be a reliable (CR indices > 0.7) and valid (AVE > 0.5) instrument in measuring self-care agency among Spanish older population.
Design and fabrication of crack-junctions
Authors: Dubois Valentin , Niklaus Frank , Stemme Göran 
Published: October 2017

AbstractNanogap electrodes consist of pairs of electrically conducting tips that exhibit nanoscale gaps. They are building blocks for a variety of applications in quantum electronics, nanophotonics, plasmonics, nanopore sequencing, molecular electronics, and molecular sensing. Crack-junctions (CJs) constitute a new class of nanogap electrodes that are formed by controlled fracture of suspended bridge structures fabricated in an electrically conducting thin film under residual tensile stress. Key advantages of the CJ methodology over alternative technologies are that CJs can be fabricated with wafer-scale processes, and that the width of each individual nanogap can be precisely controlled in a range from <2 to >100 nm. While the realization of CJs has been demonstrated in initial experiments, the impact of the different design parameters on the resulting CJs has not yet been studied. Here we investigate the influence of design parameters such as the dimensions and shape of the notches, the length of the electrode-bridge and the design of the anchors, on the formation and propagation of cracks and on the resulting features of the CJs. We verify that the design criteria yields accurate prediction of crack formation in electrode-bridges featuring a beam width of 280 nm and beam lengths ranging from 1 to 1.8 μm. We further present design as well as experimental guidelines for the fabrication of CJs and propose an approach to initiate crack formation after release etching of the suspended electrode-bridge, thereby enabling the realization of CJs with pristine electrode surfaces.
Advances in diamond nanofabrication for ultrasensitive devices
Authors: Castelletto Stefania , Rosa Lorenzo , Blackledge Jonathan , Al Abri Mohammed Zaher , Boretti Albert 
Published: October 2017

AbstractThis paper reviews some of the major recent advances in single-crystal diamond nanofabrication and its impact in nano- and micro-mechanical, nanophotonics and optomechanical components. These constituents of integrated devices incorporating specific dopants in the material provide the capacity to enhance the sensitivity in detecting mass and forces as well as magnetic field down to quantum mechanical limits and will lead pioneering innovations in ultrasensitive sensing and precision measurements in the realm of the medical sciences, quantum sciences and related technologies.
A minimalist approach to stereoselective glycosylation with unprotected donors
Authors: Le Mai Hoang Kim , He Jing-xi , Báti Gábor , Chan-Park Mary B. , Liu Xue-Wei 
Published: October 2017

AbstractMechanistic study of carbohydrate interactions in biological systems calls for the chemical synthesis of these complex structures. Owing to the specific stereo-configuration at each anomeric linkage and diversity in branching, significant breakthroughs in recent years have focused on either stereoselective glycosylation methods or facile assembly of glycan chains. Here, we introduce the unification approach that offers both stereoselective glycosidic bond formation and removal of protection/deprotection steps required for further elongation. Using dialkylboryl triflate as an in situ masking reagent, a wide array of glycosyl donors carrying one to three unprotected hydroxyl groups reacts with various glycosyl acceptors to furnish the desired products with good control over regioselectivity and stereoselectivity. This approach demonstrates the feasibility of straightforward access to important structural scaffolds for complex glycoconjugate synthesis.
Mice in social conflict show rule-observance behavior enhancing long-term benefit
Authors: Choe Il-Hwan , Byun Junweon , Kim Ko Keun , Park Sol , Kim Isaac , Jeong Jaeseung , Shin Hee-Sup 
Published: October 2017

AbstractDisorderly resolution of conflict is costly, whereas orderly resolution by consent rules enables quick settlement. However, it is unclear whether non-human animals can make and observe rules to resolve conflict without aggression. Here we report a new behavioral paradigm for mice: a modified two-armed maze that uses wireless electrical brain stimulation as reward. First, the mice were individually operant-trained to initiate and then receive the reward at the signaled arm. Next, two mice were coupled and had to cooperate to initiate reward but then to compete over reward allocation. Mice develop and observe a rule of reward zone allocation that increases the total amount of reward and reward equity between the pair. In the mutual rule-observance behavior, positive reciprocity and tolerance to the other’s violation are also observed. These findings suggest that rodents can learn to make and observe rules to resolve conflict, enhancing long-term benefit and payoff equity.
Adaptive artificial evolution of droplet protocells in a 3D-printed fluidic chemorobotic platform with configurable environments
Authors: Parrilla-Gutierrez Juan Manuel , Tsuda Soichiro , Grizou Jonathan , Taylor James , Henson Alon , Cronin Leroy 
Published: October 2017

AbstractEvolution via natural selection is governed by the persistence and propagation of living things in an environment. The environment is important since it enabled life to emerge, and shapes evolution today. Although evolution has been widely studied in a variety of fields from biology to computer science, still little is known about the impact of environmental changes on an artificial chemical evolving system outside of computer simulations. Here we develop a fully automated 3D-printed chemorobotic fluidic system that is able to generate and select droplet protocells in real time while changing the surroundings where they undergo artificial evolution. The system is produced using rapid prototyping and explicitly introduces programmable environments as an experimental variable. Our results show that the environment not only acts as an active selector over the genotypes, but also enhances the capacity for individual genotypes to undergo adaptation in response to environmental pressures.
Colloidal zinc oxide-copper(I) oxide nanocatalysts for selective aqueous photocatalytic carbon dioxide conversion into methane
Authors: Bae Kyung-Lyul , Kim Jinmo , Lim Chan Kyu , Nam Ki Min , Song Hyunjoon 
Published: October 2017

AbstractDeveloping catalytic systems with high efficiency and selectivity is a fundamental issue for photochemical carbon dioxide conversion. In particular, rigorous control of the structure and morphology of photocatalysts is decisive for catalytic performance. Here, we report the synthesis of zinc oxide-copper(I) oxide hybrid nanoparticles as colloidal forms bearing copper(I) oxide nanocubes bound to zinc oxide spherical cores. The zinc oxide-copper(I) oxide nanoparticles behave as photocatalysts for the direct conversion of carbon dioxide to methane in an aqueous medium, under ambient pressure and temperature. The catalysts produce methane with an activity of 1080 μmol gcat−1 h−1, a quantum yield of 1.5% and a selectivity for methane of >99%. The catalytic ability of the zinc oxide-copper(I) oxide hybrid catalyst is attributed to excellent band alignment of the zinc-oxide and copper(I) oxide domains, few surface defects which reduce defect-induced charge recombination and enhance electron transfer to the reagents, and a high-surface area colloidal morphology.
Water induced sediment levitation enhances downslope transport on Mars
Authors: Raack Jan , Conway Susan J. , Herny Clémence , Balme Matthew R. , Carpy Sabrina , Patel Manish R. 
Published: October 2017

AbstractOn Mars, locally warm surface temperatures (~293 K) occur, leading to the possibility of (transient) liquid water on the surface. However, water exposed to the martian atmosphere will boil, and the sediment transport capacity of such unstable water is not well understood. Here, we present laboratory studies of a newly recognized transport mechanism: “levitation” of saturated sediment bodies on a cushion of vapor released by boiling. Sediment transport where this mechanism is active is about nine times greater than without this effect, reducing the amount of water required to transport comparable sediment volumes by nearly an order of magnitude. Our calculations show that the effect of levitation could persist up to ~48 times longer under reduced martian gravity. Sediment levitation must therefore be considered when evaluating the formation of recent and present-day martian mass wasting features, as much less water may be required to form such features than previously thought.
RETRACTED ARTICLE: Sulfur availability regulates plant growth via glucose-TOR signaling
Authors: Dong Yihan , Silbermann Marleen , Speiser Anna , Forieri Ilaria , Linster Eric , Poschet Gernot , Allboje Samami Arman , Wanatabe Mutsumi , Sticht Carsten , Teleman Aurelio A. , Deragon Jean-Marc , Saito Kazuki , Hell Rüdiger , Wirtz Markus 
Published: October 2017

AbstractGrowth of eukaryotic cells is regulated by the target of rapamycin (TOR). The strongest activator of TOR in metazoa is amino acid availability. The established transducers of amino acid sensing to TOR in metazoa are absent in plants. Hence, a fundamental question is how amino acid sensing is achieved in photo-autotrophic organisms. Here we demonstrate that the plant Arabidopsis does not sense the sulfur-containing amino acid cysteine itself, but its biosynthetic precursors. We identify the kinase GCN2 as a sensor of the carbon/nitrogen precursor availability, whereas limitation of the sulfur precursor is transduced to TOR by downregulation of glucose metabolism. The downregulated TOR activity caused decreased translation, lowered meristematic activity, and elevated autophagy. Our results uncover a plant-specific adaptation of TOR function. In concert with GCN2, TOR allows photo-autotrophic eukaryotes to coordinate the fluxes of carbon, nitrogen, and sulfur for efficient cysteine biosynthesis under varying external nutrient supply.
Engineering a synthetic pathway for maleate in Escherichia coli
Authors: Noda Shuhei , Shirai Tomokazu , Mori Yutaro , Oyama Sachiko , Kondo Akihiko 
Published: October 2017

AbstractMaleate is one of the most important dicarboxylic acids and is used to produce various polymer compounds and pharmaceuticals. Herein, microbial production of maleate is successfully achieved, to our knowledge for the first time, using genetically modified Escherichia coli. A synthetic pathway of maleate is constructed in E. coli by combining the polyketide biosynthesis pathway and benzene ring cleavage pathway. The metabolic engineering approach used to fine-tune the synthetic pathway drastically improves maleate production and demonstrates that one of the rate limiting steps exists in the conversion of chorismate to gentisate. In a batch culture of the optimised transformant, grown in a 1-L jar fermentor, the amount of produced maleate reaches 7.1 g L−1, and the yield is 0.221 mol mol−1. Our results suggest that the construction of synthetic pathways by combining a secondary metabolite pathway and the benzene ring cleavage pathway is a powerful tool for producing various valuable chemicals.
Structure of SgK223 pseudokinase reveals novel mechanisms of homotypic and heterotypic association
Authors: Patel Onisha , Griffin Michael D. W. , Panjikar Santosh , Dai Weiwen , Ma Xiuquan , Chan Howard , Zheng Celine , Kropp Ashleigh , Murphy James M. , Daly Roger J. , Lucet Isabelle S. 
Published: October 2017

AbstractThe mammalian pseudokinase SgK223, and its structurally related homologue SgK269, are oncogenic scaffolds that nucleate the assembly of specific signalling complexes and regulate tyrosine kinase signalling. Both SgK223 and SgK269 form homo- and hetero-oligomers, a mechanism that underpins a diversity of signalling outputs. However, mechanistic insights into SgK223 and SgK269 homo- and heterotypic association are lacking. Here we present the crystal structure of SgK223 pseudokinase domain and its adjacent N- and C-terminal helices. The structure reveals how the N- and C-regulatory helices engage in a novel fold to mediate the assembly of a high-affinity dimer. In addition, we identified regulatory interfaces on the pseudokinase domain required for the self-assembly of large open-ended oligomers. This study highlights the diversity in how the kinase fold mediates non-catalytic functions and provides mechanistic insights into how the assembly of these two oncogenic scaffolds is achieved in order to regulate signalling output.
A neuroprotective astrocyte state is induced by neuronal signal EphB1 but fails in ALS models
Authors: Tyzack Giulia E. , Hall Claire E. , Sibley Christopher R. , Cymes Tomasz , Forostyak Serhiy , Carlino Giulia , Meyer Ione F. , Schiavo Giampietro , Zhang Su-Chun , Gibbons George M. , Newcombe Jia , Patani Rickie , Lakatos András 
Published: October 2017

AbstractAstrocyte responses to neuronal injury may be beneficial or detrimental to neuronal recovery, but the mechanisms that determine these different responses are poorly understood. Here we show that ephrin type-B receptor 1 (EphB1) is upregulated in injured motor neurons, which in turn can activate astrocytes through ephrin-B1-mediated stimulation of signal transducer and activator of transcription-3 (STAT3). Transcriptional analysis shows that EphB1 induces a protective and anti-inflammatory signature in astrocytes, partially linked to the STAT3 network. This is distinct from the response evoked by interleukin (IL)-6 that is known to induce both pro inflammatory and anti-inflammatory processes. Finally, we demonstrate that the EphB1–ephrin-B1 pathway is disrupted in human stem cell derived astrocyte and mouse models of amyotrophic lateral sclerosis (ALS). Our work identifies an early neuronal help-me signal that activates a neuroprotective astrocytic response, which fails in ALS, and therefore represents an attractive therapeutic target.