bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Combined Theory‐Experiment Analysis of the Surface Species in Lithium‐Mediated NH3 Electrosynthesis
Authors: Schwalbe Jay A. , Statt Michael J. , Chosy Cullen , Singh Aayush R. , Rohr Brian A. , Nielander Adam C. , Andersen Suzanne Z. , McEnaney Joshua M. , Baker Jon G. , Jaramillo Thomas F. , Norskov Jens K. , Cargnello Matteo 
Published: January 2020

AbstractElectrochemical processes for ammonia synthesis could potentially replace the high temperature and pressure conditions of the Haber‐Bosch process, with voltage offering a pathway to distributed fertilizer production that leverages the rapidly decreasing cost of renewable electricity. However, nitrogen is an unreactive molecule and the hydrogen evolution reaction presents a major selectivity challenge. An electrode of electrodeposited lithium in tetrahydrofuran solvent overcomes both problems by providing a surface that easily reacts with nitrogen and by limiting the access of protons with a nonaqueous electrolyte. Under these conditions, we measure relatively high faradaic efficiencies (ca. 10 %) and rates (0.1 mA cm−2) toward NH3. We observe the development of a solid electrolyte interface layer as well as the accumulation of lithium and lithium‐containing species. Detailed DFT studies suggest lithium nitride and hydride to be catalytically active phases given their thermodynamic and kinetic stability relative to metallic lithium under reaction conditions and the fast diffusion of nitrogen in lithium.
Intrinsic Turn‐On Response of Thioflavin T in Complexes
Authors: Kung Jocky C. K. , Vurgun Nesrin , Chen JoAnn C. , Nitz Mark , Jockusch Rebecca A. 
Published: January 2020

AbstractThe fluorescence enhancement (“turn‐on”) response of the amyloid‐sensing dye thioflavin T (ThT) is examined in vacuo, where solvent interactions are absent. Upon the complexation of ThT with a derivatized β‐cyclodextrin, heptakis‐[6‐deoxy‐6‐(3‐sulfanylpropanoic acid)]‐β‐cyclodextrin, turn‐on responses in both the gas phase and solution phase were observed. In contrast, turn‐on response was not detected when ThT was bound to gaseous cucurbit[7]uril or human telomeric DNA 22AG, whereas clear turn‐on response occurs in solution. The observed difference in turn‐on response in the gas phase emphasizes the key interplay between chromophore, host and solvent and demonstrates the utility of gas‐phase spectroscopy to tease out the balance among intermolecular forces driving the behavior of important chromophores in solution.
Coordinating Ability of Anions, Solvents, Amino Acids, and Gases towards Alkaline and Alkaline‐Earth Elements, Transition Metals, and Lanthanides
Authors: Alvarez Santiago 
Published: January 2020

AbstractAfter briefly reviewing the applications of the coordination ability indices proposed earlier for anions and solvents toward transition metals and lanthanides, a new analysis of crystal structures is applied now to a much larger number of coordinating species: anions (including those that are present in ionic solvents), solvents, amino acids, gases, and a sample of neutral ligands. The coordinating ability towards s‐block elements is now also considered. The effect of several factors on the coordinating ability will be discussed: (a) the charge of an anion, (b) the chelating nature of anions and solvents, (c) the degree of protonation of oxo‐anions, carboxylates and amino carboxylates, and (d) the substitution of hydrogen atoms by methyl groups in NH3, ethylenediamine, benzene, ethylene, pyridine and aldehydes. Hit parades of solvents and anions most commonly used in the areas of transition metal, s‐block and lanthanide chemistry are deduced from the statistics of their presence in crystal structures.
Single‐walled carbon nanotube absolute‐handedness chirality assignment confirmation using metalized porphyrin's supramolecular structures via STM imaging technique
Authors: Abd El‐Mageed Ahmed I. A. , Ogawa Takuji 
Published: January 2020

AbstractThis work reports confirmation of the experimental assignment of the absolute‐handedness chirality of single‐walled carbon nanotubes (SWNTs). This was achieved by applying the scanning tunneling microscopy (STM) imaging technique to a supramolecular composite consisting of a metalized porphyrin derivative (nickel‐5,15‐bisdodecylporphyrin [Ni‐BDP]) affixed to the surfaces of chiral‐concentrated SWNTs (with right‐handed helix P‐ and left‐handed helix M‐). On the basis of the handedness chirality, different chiral supramolecular structures of Ni‐BDP were observed on the surfaces of the two SWNT enantiomers. The incorporation of a metal center into the porphyrin ring did not significantly affect the SWNT absolute‐handedness chirality assignment, the large pi‐system porphyrin ring being the crucial factor. These findings will effectively pave the way towards the clear selective synthesis, separation, chemistry, and applications of SWNT enantiomers.
Online visual tracking via cross‐similarity‐based siamese network
Authors: Wang Luyao , Lu Huchuan , Zhang Pingping 
Published: January 2020

SummaryAmong deep‐learning‐based trackers, the siamese‐based method inspires many researchers due to its effectiveness and simplicity. However, the traditional siamese tracker has not achieved satisfactory performance due to the limited representation ability and the lack of appropriate model update strategy. To cover the shortage of siamese models, we proposed a cross‐similarity‐based siamese network with three contributions. First, we introduce a novel cross similarity module into the SiameseFC framework, which could improve the matching ability of fully convolutional networks during the tracking process. Second, we propose a novel attention weighting layer to emphasize various contributions of matching scores in different positions. This adaptive attention weighting scheme makes our tracker well adapt to the appearance change caused by pose variation, partial occlusion, and so on. Third, we develop a simple yet effective model update strategy, which exploits an independent classification model to invoke the model fine‐tuning process. Experimental results on the standard tracking benchmark show that our tracker performs much better than the baseline SiameseFC method and also achieves promising results in comparisons to other state‐of‐the‐art algorithms.
Specializing parallel data structures for Datalog
Authors: Jordan Herbert , Subotić Pavle , Zhao David , Scholz Bernhard 
Published: January 2020

SummaryWe see a resurgence of Datalog in a variety of applications, including program analysis, networking, data integration, cloud computing, and security. The large‐scale and complexity of these applications need the efficient management of data in relations. Hence, Datalog implementations require new data structures for managing relations that (1) are parallel, (2) are highly specialized for Datalog evaluation, and (3) can accommodate different workloads depending on the applications concerning memory consumption and computational efficiency. In this article, we present a data structure framework for relations that is specialized for shared‐memory parallel Datalog implementations such as the soufflé Datalog compiler. The data structure framework permits a portfolio of different data structures depending on the workload. We also introduce two concrete parallel data structures for relations, designed for various workloads. Our benchmarks demonstrate a speed‐up of up to 6× by using a portfolio of data structures compared with using a B‐tree alone, showing the advantage of our data structure framework.
Identification of wheat germplasm resistant to major Russian wheat aphid biotypes in the United States
Authors: Xu Xiangyang , Li Genqiao , Carver Brett F. , Puterka Gary 
Published: January 2020

AbstractRussian wheat aphid (Diuraphis noxia Kurdjumov [RWA]) is one of the most invasive and detrimental pests, and host plant resistance is the most efficient approach to manage RWA. Wheat (Triticum aestivum L.) accessions resistant to RWA biotype 1 (RWA1) and biotype 2 (RWA2) were previously identified by screening wheat accessions available at the USDA‐ARS National Small Grains Collection. However, RWA biotypic variation necessitates a continuous search for sources of resistance to new RWA biotypes. The objective of this study was to identify wheat accessions resistant to all major RWA biotypes in the United States. A set of 172 RWA‐resistant wheat accessions, mainly Iranian landraces, were evaluated for responses to five predominant U.S. biotypes—RWA1, RWA2, RWA3, RWA6, and RWA8—in controlled environments. Of these, 137 accessions showed homogeneous or heterogeneous resistance to at least one biotype, and 14 of them were resistant or highly resistant to all five biotypes. Another set of 19 accessions were resistant or highly resistant to two to four biotypes. These RWA‐resistant accessions are valuable sources for RWA resistance improvement, and further purification of some accessions and characterization of the underlying RWA resistance genes are imperative for their utilization in wheat breeding.
The effect of the size of the board of directors on corporate social performance: A meta‐analytic approach
Authors: Zubeltzu‐Jaka Eugenio , Álvarez‐Etxeberria Igor , Ortas Eduardo 
Published: January 2020

AbstractThis paper examines the influence of the size of firms' board of directors on corporate social performance through a meta‐analytic perspective. To that end, a sample of 80 articles that draw on evidence from more than 80,000 international companies, published between 1997 and 2018, was examined. This paper analyzes the moderating effect of a set of corporate governance mechanisms such as board composition and corporate governance systems on the hypothesized relationship between the size of firms' board and corporate social performance. Our central results reveal that larger and more independent boards better represent stakeholders' sensitivities and allow companies to achieve their social objectives. Moreover, that connection is more positive and stronger in companies with more independent boards and in countries that have codified law, which often have fewer mechanisms to protect shareholders' interests.
miR‐199 plays both positive and negative regulatory roles in Xenopus eye development
Authors: Ritter Ruth A. , Ulrich Christina H. , Brzezinska Bogna N. , Shah Vrutant V. , Zamora Melissa J. , Kelly Lisa E. , El‐Hodiri Heithem M. , Sater Amy K. 
Published: January 2020

SummaryTo investigate microRNA (miR) functions in early eye development, we asked whether eye field transcription factors (EFTFs) are targets of miR‐dependent regulation in Xenopus embryos. Argonaute (AGO) ribonucleoprotein complexes, including miRs and targeted mRNAs, were coimmunoprecipitated from transgenic embryos expressing myc‐tagged AGO under the control of the rax1 promoter; mRNAs for all EFTFs coimmunoprecipitated with Ago in late neurulae. Computational predictions of miR binding sites within EFTF 3′UTRs identified miR‐199a‐3p (“miR‐199”) as a candidate regulator of EFTFs, and miR‐199 was shown to regulate rax1 in vivo. Targeted overexpression of miR‐199 led to small eyes, a reduction in EFTF expression, and reduced cell proliferation. Inhibition of interactions between mir‐199 and the rax1 3′UTR reversed the small eye phenotype. Although targeted knockdown of miR‐199 left the eye field intact, it reduced optic cup outgrowth and disrupted eye formation. Computational identification of candidate miR‐199 targets within the Xenopus transcriptome led to the identification of ptk7 as a candidate regulator. Targeted overexpression of ptk7 resulted in abnormal optic cup formation and a reduction or loss of eye development, recapitulating the range of eye phenotypes seen following miR‐199 knockdown. Our results indicate that miR‐199 plays both positive and negative regulatory roles in eye development.
Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay
Authors: Marcot Bruce G. , Woo Isa , Thorne Karen M. , Freeman Chase M. , Guntenspergen Glenn R. 
Published: January 2020

AbstractUnderstanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight associated small mammal species from annual trap data, 1998–2014, in six estuarine marshes in North San Francisco Bay, California. Covariates included microhabitat metrics of elevation and vegetation species and cover; and landscape metrics of latitude–longitude, distance to anthropogenic features, and habitat patch size. The dominant cover was pickleweed (Salicornia pacifica) with 86% mean cover and 37 cm mean height, and bare ground with about 10% mean cover. We tested 38 variants of Bayesian network (BN) models to determine covariates that best account for presence of RERA and of all nine small mammal species. Best models had lowest complexity and highest classification accuracy. Among RERA presence models, three best BN models used covariates of latitude–longitude, distance to paved roads, and habitat patch size, with 0% error of false presence, 20% error of false nonpresence, and 20% overall error. The all‐species presence models suggested that within the pickleweed marsh environment, RERA are mostly habitat generalists. Accounting for presence of other species did not improve prediction of RERA. Habitat attributes compared between RERA and the next most frequently captured species, California vole (Microtus californicus), suggested substantial habitat overlap, with RERA habitat being somewhat higher in marsh elevation, greater in percent cover of the dominant plant species, closer to urban areas, further from agricultural areas, and, perhaps most significant, larger in continuous size of marsh patch. Findings will inform conservation management of the marsh environment for RERA by identifying best microhabitat elements, landscape attributes, and adverse interspecific interactions.
Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)
Authors: Lumley Lisa M. , Pouliot Esther , Laroche Jérôme , Boyle Brian , Brunet Bryan M. T. , Levesque Roger C. , Sperling Felix A. H. , Cusson Michel 
Published: January 2020

AbstractThe spruce budworm, Choristoneura fumiferana, is presumed to be panmictic across vast regions of North America. We examined the extent of panmixia by genotyping 3,650 single nucleotide polymorphism (SNP) loci in 1975 individuals from 128 collections across the continent. We found three spatially structured subpopulations: Western (Alaska, Yukon), Central (southeastern Yukon to the Manitoba–Ontario border), and Eastern (Manitoba–Ontario border to the Atlantic). Additionally, the most diagnostic genetic differentiation between the Central and Eastern subpopulations was chromosomally restricted to a single block of SNPs that may constitute an island of differentiation within the species. Geographic differentiation in the spruce budworm parallels that of its principal larval host, white spruce (Picea glauca), providing evidence that spruce budworm and spruce trees survived in the Beringian refugium through the Last Glacial Maximum and that at least two isolated spruce budworm populations diverged with spruce/fir south of the ice sheets. Gene flow in the spruce budworm may also be affected by mountains in western North America, habitat isolation in West Virginia, regional adaptations, factors related to dispersal, and proximity of other species in the spruce budworm species complex. The central and eastern geographic regions contain individuals that assign to Eastern and Central subpopulations, respectively, indicating that these barriers are not complete. Our discovery of previously undetected geographic and genomic structure in the spruce budworm suggests that further population modelling of this ecologically important insect should consider regional differentiation, potentially co‐adapted blocks of genes, and gene flow between subpopulations.
Gut microbiota in reintroduction of giant panda
Authors: Tang Jingsi , Wang Chengdong , Zhang Hemin , Zhao Jiangchao , Guo Wei , Mishra Sudhanshu , Kong Fanli , Zeng Bo , Ning Ruihong , Li Desheng , Yang Jiandong , Yang Mingyao , Zhang Mingwang , Ni Qingyong , Li Yan , Li Ying 
Published: January 2020

AbstractReintroduction is a key approach in the conservation of endangered species. In recent decades, many reintroduction projects have been conducted for conservation purposes, but the rate of success has been low. Given the important role of gut microbiota in health and diseases, we questioned whether gut microbiota would play a crucial role in giant panda's wild‐training process. The wild procedure is when captive‐born babies live with their mothers in a wilderness enclosure and learn wilderness survival skills from their mothers. During the wild‐training process, the baby pandas undergo wilderness survival tests and regular physical examinations. Based on their performance through these tests, the top subjects (age 2–3 years old) are released into the wild while the others are translocated to captivity. After release, we tracked one released panda (Zhangxiang) and collected its fecal samples for 5 months (January 16, 2013 to March 29 2014). Here, we analyzed the Illumina HiSeq sequencing data (V4 region of 16S rRNA gene) from captive pandas (n = 24), wild‐training baby pandas (n = 8) of which 6 were released and 2 were unreleased, wild‐training mother pandas (n = 8), one released panda (Zhangxiang), and wild giant pandas (n = 18). Our results showed that the gut microbiota of wild‐training pandas is significantly different from that of wild pandas but similar to that of captive ones. The gut microbiota of the released panda Zhangxiang gradually changed to become similar to those of wild pandas after release. In addition, we identified several bacteria that were enriched in the released baby pandas before release, compared with the unreleased baby pandas. These bacteria include several known gut‐health related beneficial taxa such asRoseburia,Coprococcus,Sutterella, Dorea,andRuminococcus. Therefore, our results suggest that certain members of the gut microbiota may be important in panda reintroduction.
Relationships between plant diversity and soil microbial diversity vary across taxonomic groups and spatial scales
Authors: Liu Lan , Zhu Kai , Wurzburger Nina , Zhang Jian 
Published: January 2020

AbstractPlant diversity has long been assumed to predict soil microbial diversity. However, contradictory results have been found when examining their relationships, particularly at broad spatial scales. To address this issue, we conducted a meta‐analysis to evaluate the patterns in the correlation between plant diversity and soil microbial diversity and the underlying factors driving the relationship. We collected correlation data from 84 studies covering more than 3900 natural terrestrial samples globally. Using the hierarchical mixed‐effects model, we investigated factors including targeted taxonomic group, microbial examination method, sampling extent, biome type, soil type, and environmental factors to assess the patterns of the plant–microbial correlation and the determinants of their variations. We found that microbial richness displayed a modest but positive correlation with plant diversity (r = 0.333, CI = 0.220–0.437). In spite of variability among taxonomic groups and their relationship with plant diversity, positive correlations were more pronounced in the intermediate sampling extent of latitude and elevation coverage, and tropical forests. Among examined environmental factors, soil pH was negatively associated with the plant and soil microbial relationships at large spatial scales. The plant–microbial correlation appears more sensitive to edaphic factor variation in the poor nutrients and soil less compact systems. Collectively, our results point to key differences across taxonomic groups, spatial scales and biomes, and the modulating effects of climate and soil. The findings shed light on our deep understanding in plant–microbial diversity relationships at broad spatial scales and ecosystem sensitivity to biodiversity loss and environmental change.
Environmental DNA detection of Arctic char (Salvelinus alpinus) in Irish lakes: Development and application of a species‐specific molecular assay
Authors: Mirimin Luca , Hickey Aaron , Barrett Dylan , DeFaoite Fergus , Boschetti Simona , Venkatesh Shraveena , Graham Conor T. 
Published: January 2020

AbstractPopulations of Arctic char (Salvelinus alpinus) inhabiting Irish lakes are undergoing a rapid decline. In order to aid monitoring of this species in Irish lakes, a species‐specific qPCR assay was designed and subsequently tested for the detection of Arctic char's environmental DNA (eDNA) in an indoor mesocosm and in natural habitats (six lakes). Specifically, the mesocosm experiment revealed that sample volume can have significant effects on the application of eDNA approaches, whereby probability of detection depends from proximity to the source organism and volume of water filtered. When tested in the wild, positive amplification of Arctic char eDNA was observed in four of the six lakes sampled, proving that this approach can be successfully implemented in natural conditions. However, findings from the present study also showed that suboptimal sampling strategies can lead to false‐negative results (e.g., failure to detect the species when it is present). This study corroborates findings from other research on eDNA detection of fish species, showing that despite its current limitations, this approach can be a fast, noninvasive, and effective tool in aid to the conservation and management of freshwater fish species.