bluuebunny/crossref_metadata_2025_split huggingface dataset:
Specialized Feathers Produce Sonations During Flight in Columbina Ground Doves
Authors: Niese Robert L , Clark Christopher J , Tobalske Bret W 
Published: May 2020

Synopsis
The shape of remiges (primary and secondary feathers) is constrained and stereotyped by the demands of flight, but members of the subfamily of New World ground doves (Peristerinae) possess many atypical remex shapes with which they produce sonations of alarm. Within the genus Columbina specifically, the seventh primary feathers (P7) have elongated barbs that create a protrusion on the trailing vane which varies in size and shape between species. These feathers are hypothesized to have been coopted to produce communicative sounds (i.e., sonations) during flight, but the mechanism of this sound production is unknown. We tested the sound-producing capabilities of spread wing specimens from three species of ground doves (C. inca, C. passerina, and C. talpacoti) in a wind tunnel. High speed video and audio analyses indicated that all wings of adult birds produced buzzing sounds in the orientation and flow velocity of mid-upstroke. These buzzing sounds were produced as the protrusion of elongated barbs fluttered and collided with adjacent P6 feathers at a fundamental frequency of 200 and 400 Hz, respectively. Wings from juvenile C. inca produced significantly quieter buzzes and most (three of four individuals) lacked the elongated barbs that are present in adults. Buzzing sounds produced in the wind tunnel were similar to those produced by wild birds indicating that these P7 feathers have been coopted to produce acoustic signals (sonations) during flight. The shape and mechanism of sound production described here in Columbina appear to be unique among birds.
Periodic Staircase Matrices and Generalized Cluster Structures
Authors: Gekhtman Misha , Shapiro Michael , Vainshtein Alek 
Published: May 2020

AbstractAs is well known, cluster transformations in cluster structures of geometric type are often modeled on determinant identities, such as short Plücker relations, Desnanot–Jacobi identities, and their generalizations. We present a construction that plays a similar role in a description of generalized cluster transformations and discuss its applications to generalized cluster structures in $GL_n$ compatible with a certain subclass of Belavin–Drinfeld Poisson–Lie brackets, in the Drinfeld double of $GL_n$, and in spaces of periodic difference operators.
Community-Level Postmaterialism and Anti-Migrant Attitudes: An Original Survey on Opposition to Sub-Saharan African Migrants in the Middle East
Authors: Buehler Matt , Fabbe Kristin E , Han Kyung Joon 
Published: May 2020

AbstractWhy do native citizens of the Middle East and North Africa express greater opposition to certain types of migrants, refugees, and displaced persons? Why, particularly, do they express greater opposition to sub-Saharan African migrants? This article investigates these questions, leveraging results from an original, nationally representative survey of 2700 native Moroccan citizens. We find support for traditional theories, mostly developed from studies of Western Europe, that hypothesize that the perceived cultural, economic, and security threats migrants pose provoke citizen opposition to certain migrant subtypes. Diverging from past research, however, we argue that the importance of these threats waxes and wanes dramatically at the subnational level due to variation in community-level postmaterialism. In areas where economic development is high, and many citizens live in European-style conditions, postmaterialism—preoccupation with cultural, identity, and security-based concerns—helps to predict greater citizen opposition to sub-Saharan African migrants. However, in areas where economic development is low, and many citizens do not live like Europeans, this greater opposition to African migrants derives from economic concerns, notably job competition. While postmaterialism is considered an individual-level phenomenon, our work highlights its importance at the community level: The personal circumstances of citizens and the circumstances of the community in which they live interact to condition which perceived threats become more (or less) important to explaining anti-migrant attitudes.
A new fossil cricetid (Rodentia, Sigmodontinae) from northeastern Brazil with remarks on small mammal extinctions in the tropical Quaternary
Authors: das Neves Simone B , Pardiñas Ulyses F J , Hadler Patrícia , Mayer Elver L , Ribeiro Ana M 
Published: May 2020

AbstractThe rare cricetid rodent Bibimys Massoia, 1980 contains three extant species that are distributed in the lowlands of eastern South America between 35°S and 20°S and distinguished mostly by subtle morphological and genetic features. Several fragmented jaws belonging to this genus were recovered from Late Quaternary deposits located in northeastern Brazil, forming part of a rich archaeological and paleontological small mammal assemblage that has been recovered from caves in the Serra da Capivara, state of Piauí. This material is described herein as belonging to a new species, the most hypsodont member of the genus. The specimens also represent an extralimital occurrence of this sigmodontine, as the nearest extant population of Bibimys is ~1,200 km to the south. Because there are few reliable records of extinct small mammals from the Pleistocene–Holocene transition on the South American continent, in describing this new sigmodontine we extend the records of past biodiversity preserved in the Quaternary deposits of tropical South America. This new species likewise highlights that the Serra da Capivara deposits are promising for understanding the evolutionary history of cricetid rodents.
Probing the therapeutic potential of TRPC6 for Alzheimer’s disease in live neurons from patient-specific iPSCs
Authors: Tao Ran , Lu Rui , Wang Junfeng , Zeng Shujun , Zhang Ting , Guo Wenke , Zhang Xiaobing , Cheng Qi , Yue Chunmei , Wang Yizheng , Jing Naihe 
Published: May 2020

AbstractThe induced pluripotent stem cells (iPSCs) offer an unprecedented opportunity to model and study Alzheimer’s disease (AD) under patient-specific genetic background. The lower expression of transient receptor potential canonical 6 (TRPC6) was associated with AD patients, which might be involved in AD pathogenesis. However, the role of TRPC6 that played in AD process still needs more investigation in patient-relevant neurons. In this study, the iPSCs were generated from peripheral blood cells of sporadic AD patients and efficiently differentiated into mature cortical neurons. These sporadic AD-bearing neurons displayed higher levels of AD pathological markers Aβ and phospho-tau, but lower levels of TRPC6, than those of control neurons. Treatment of AD neurons with TRPC6 protein fragment or agonist inhibited the elevation of Aβ and phospho-tau. Our results in live AD neurons manifest that the compromised expression of TRPC6 substantially contributed to Aβ pathology of sporadic AD, suggesting that targeting TRPC6 could help to develop novel therapeutic strategies for the treatments of AD.
Variation of the Phlebotominae (Diptera: Psychodidae: Phlebotominae) Assemblage in Response to Land Use Changes in an Endemic Area of Leishmania Transmission in Northeast Argentina
Authors: Fernández María S , Manteca-Acosta Mariana , Cueto Gerardo R , Cavia Regino , Salomón Oscar D 
Published: May 2020

Abstract
Leishmaniases are a global health problem and in Argentina are considered emerging diseases. The new transmission scenarios of tegumentary leishmaniasis are especially important given that large areas of forest are being transformed into rural and urban systems. The aim of this study was to analyze the impact of the construction of a large public building and a neighborhood on the assemblage of Phlebotominae in a rural area with forest remnants and to correlate the changes observed in the species assemblage with characteristics of the environment. Entomological surveys with light traps were conducted on the construction campus in the northeastern region of Argentina at six sites representing different environmental situations. Structural environmental characteristics and meteorological conditions were recorded and analyzed. At least 16 species of Phlebotominae sand flies were collected, the most prevalent being Nyssomyia whitmani (Antunes & Coutinho), followed by the genus Brumptomyia (França & Parrot) and Migonemyia migonei (França). Our study provides evidence of how the structure of the assemblages and prevalent species respond to anthropogenic disturbances. As the construction progressed, both Ny. whitmani and the genus Brumptomyia were favored. The genus Brumptomyia was favored at sites surrounded by high proportions of forest, within patches of remnant vegetation, and relatively far from anthropogenic disturbances, while Ny. whitmani, the main vector of tegumentary leishmaniasis in the region, increases their abundant at short and intermediate distances from vegetation margins and areas close to anthropogenic disturbances, therefore increasing the risk of human exposure to vectors.
No Alarms and Many Surprises: Salience as a Basis For Excessive Pricing Intervention in an Antitrust Context
Authors: Vásquez Duque Omar 
Published: May 2020

Abstract
This article explores how consumers’ bounded rationality can justify antitrust intervention when a firm becomes a monopoly and exploits a product attribute that was not policed by market forces when there was competition for the market. Behavioral economics predicts product complexity leads consumer demand to be a function of salient costs and benefits rather than of actual costs and benefits of products. The divergence between the former and the latter hinders and distorts competition. In fact, comparison shopping is costlier, and sellers can backload part of their prices to nonsalient product attributes. Consumers perceive only a distorted lower price by focusing on salient product features, which leaves room for inefficient matching and opportunistic behavior given the risk of ex post exploitation. These are behavioral limits of competition. In this work, I argue that when (i) there is a lock-in problem, (ii) consumers do not control the probability of triggering a hidden price, and (iii) a typical consumer could not have reasonably expected to find such a hidden price, antitrust intervention would not only deter ex post exploitation but would also enhance competition on the real price of goods. Antitrust would correct a behavioral market failure.
Capital, Conversion, and Settler Colonialism in Samuel Butler’s Erewhon
Authors: Fermanis Porscha 
Published: May 2020

Abstract
Viewing capitalism as emerging primarily from within the framework of empire rather than the nation state, this essay considers the relationship between capital, conversion, and settler colonialism in Samuel Butler’s Erewhon, or Over the Range (1872). It looks, first, at the novel’s critique of Wakefieldian organized settlement schemes as systems sustained by various forms of capital accumulation and free/unfree labour; and second, at its over-arching evangelical conversion narrative, which both frames and structures the main body of the text. The essay argues that, far from directing its satire wholly or even primarily towards metropolitan Britain, the novel enacts two circulating mid-nineteenth-century settler colonial anxieties: concerns about a perceived crisis of diminishing industriousness and economic exhaustion in colonial Australia and New Zealand, and concerns about the efficacy of British humanitarianism and missionary conversion. It considers the former in the context of the disruptions to settlement caused by the gold rushes in Australia and New Zealand in the 1850s and 1860s, and the latter in the context of missionary and humanitarian efforts to ameliorate conditions for Indigenous peoples from the 1830s onwards. The essay’s larger claim is that Erewhon presents capital and conversion as structurally interconnected mechanisms of an evolving Anglo-settler state in New Zealand. Radicalizing a tradition of economic critique of empire beginning with Adam Smith, Butler satirizes the idea of colonialism as an essentially liberal system by showing how much it is intertwined with exploitative practices of territorial expansion, dispossession, capital accumulation, unfree labour, missionary conversion, and racial assimilation.
The Relationship Between Army Soldiers’ Perceived Stress and Army Life Adjustment: Focusing on the Mediating Effect of Stress Response and the Moderating Effect of Cohesion
Authors: Ha Jung Hee , Jue Juliet , Jang Yoojin 
Published: May 2020

AbstractIntroductionSouth Korea maintains a mandatory military duty, and high percentage of conscript soldiers have difficulty adjusting to military life. The purpose of this study is to investigate the mediating effect of the stress response on the relationship between soldiers’ perceived stress and military life adjustment and to clarify the moderating effect of cohesion on this relationship.Materials and MethodsThe study’s participants were 285 Korean military soldiers who are obliged to serve in the military and they completed the Perceived Stress Scale, the Stress Response Scale, the Military Life Adjustment, and the Group Cohesion Scale. Analysis methods included descriptive statistics, correlation analysis, path analysis, bootstrapping, collinearity statistic, and hierarchical regression analysis. This research obtained the approval of the institutional review board of the university (HYI-18-229-1).ResultsFirst, a partial mediation effect of the stress response was found in the relationship between soldiers’ perceived stress and military life adjustment. That is, a high level of soldiers’ perceived stress was related to their military life maladjustment. Moreover, the greater the level of soldiers’ perceived stress, the greater the stress response, and, in turn, the greater the military life maladjustment. Second, we found the moderating effect of cohesion in the relationship between stress perception and military life adjustment.ConclusionsThe stress perceived by soldiers not only directly affects their military life adjustment but also indirectly affects their adjustment through the stress responses. In addition, soldiers’ levels of adjustment to military life change significantly based on cohesion levels only when they perceive less stress.
Dynamic topology of double-stranded telomeric DNA studied by single-molecule manipulation in vitro
Authors: Zhang Xiaonong , Zhang Yingqi , Zhang Wenke 
Published: May 2020

Abstract
The dynamic topological structure of telomeric DNA is closely related to its biological function; however, no such structural information on full-length telomeric DNA has been reported due to difficulties synthesizing long double-stranded telomeric DNA. Herein, we developed an EM-PCR and TA cloning-based approach to synthesize long-chain double-stranded tandem repeats of telomeric DNA. Using mechanical manipulation assays based on single-molecule atomic force microscopy, we found that mechanical force can trigger the melting of double-stranded telomeric DNA and the formation of higher-order structures (G-quadruplexes or i-motifs). Our results show that only when both the G-strand and C-strand of double-stranded telomeric DNA form higher-order structures (G-quadruplexes or i-motifs) at the same time (e.g. in the presence of 100 mM KCl under pH 4.7), that the higher-order structure(s) can remain after the external force is removed. The presence of monovalent K+, single-wall carbon nanotubes (SWCNTs), acidic conditions, or short G-rich fragments (∼30 nt) can shift the transition from dsDNA to higher-order structures. Our results provide a new way to regulate the topology of telomeric DNA.
Allostery of DNA nanostructures controlled by enzymatic modifications
Authors: Yan Qi , Wang Yaqi , Shi Jile , Wei Bryan 
Published: May 2020

Abstract
Allostery is comprehensively studied for natural macromolecules, such as proteins and nucleic acids. Here, we present controllable allostery of synthetic DNA nanostructure–enzyme systems. Rational designs of the synthetic allosteric systems are based on an in-depth understanding of allosteric sites with several types of strand placements, whose varying stacking strengths determine the local conformation and ultimately lead to a gradient level of allosteric transition. When enzymes in a molecular cloning toolbox such as DNA polymerase, exonuclease and ligase are applied to treat the allosteric sites, the resulting local conformational changes propagate through the entire structure for a global allosteric transition.
Edge superconductivity in multilayer WTe2 Josephson junction
Authors: Huang Ce , Narayan Awadhesh , Zhang Enze , Xie Xiaoyi , Ai Linfeng , Liu Shanshan , Yi Changjiang , Shi Youguo , Sanvito Stefano , Xiu Faxian 
Published: May 2020

Abstract
WTe2, as a type-II Weyl semimetal, has 2D Fermi arcs on the (001) surface in the bulk and 1D helical edge states in its monolayer. These features have recently attracted wide attention in condensed matter physics. However, in the intermediate regime between the bulk and monolayer, the edge states have not been resolved owing to its closed band gap which makes the bulk states dominant. Here, we report the signatures of the edge superconductivity by superconducting quantum interference measurements in multilayer WTe2 Josephson junctions and we directly map the localized supercurrent. In thick WTe2 ($\sim 60{\rm{\ nm}})$, the supercurrent is uniformly distributed by bulk states with symmetric Josephson effect ($| {I_c^ + ( B )} | {=} | {I_c^ - ( B )} |\ $). In thin WTe2 (10 nm), however, the supercurrent becomes confined to the edge and its width reaches up to $1.4{\rm{\ \mu m\ }}$and exhibits non-symmetric behavior $| {I_c^ + ( B )} | \ne | {I_c^ - ( B )} |$. The ability to tune the edge domination by changing thickness and the edge superconductivity establishes WTe2 as a promising topological system with exotic quantum phases and a rich physics.
Impact of omega-3 fatty acid DHA and EPA supplementation in pregnant or breast-feeding women on cognitive performance of children: systematic review and meta-analysis
Authors: Lehner A , Staub K , Aldakak L , Eppenberger P , Rühli F , Martin Robert D , Bender N 
Published: May 2020

Abstract

Introduction
The omega-3 long-chain polyunsaturated fatty acids docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) are important for brain development and cognitive performance. Because they are semi-essential fatty acids, they must be obtained from food. However, the dietary reference intakes of DHA and EPA have not yet been established. In women, a low DHA and/or EPA serum level during pregnancy or breastfeeding might negatively affect their children. For this study, we conducted a systematic review and meta-analysis of randomized control trials on the association between the consumption of fish oil supplements in pregnant and/or breastfeeding women and the cognitive performance of their children.

Methods
The PubMed, Embase, and Central literature databases were systematically searched. We included and extracted relevant studies in duplicate and assessed study quality. Cognitive outcomes were grouped according to published criteria and according to time elapsed after the intervention. We performed fixed-effects meta-analyses for each cognitive outcome and for birth weight. We assessed potential confounding with meta-regressions and sensitivity analyses.

Results
A total of 11 trials were included. No significant association was found between DHA/EPA supplementation and any of the assessed cognitive parameters or birth weight.

Discussion
Our results confirm previous reviews on the studied topic. Reasons for inconclusive results may be small sample sizes for each assessed category, questionable quality of included studies, and the difficulty of reliably measuring cognitive performance in small children. Blood levels of omega-3 long-chain polyunsaturated fatty acids were mostly not comparable. Furthermore, the influence of genetic and environmental factors could not be assessed. Studies in this field should address such shortcomings.
National guidelines on nutrient reference values for the healthy adult population and for pregnant or lactating women are based on heterogeneous sources of evidence: review of guidelines
Authors: Willi Sandra , Stamm Lea , Aldakak Lafi , Staub Kaspar , Rühli Frank , Bender Nicole 
Published: May 2020

AbstractMany countries provide dietary guidelines for health practitioners and/or the general population. However, there is no general, international guideline serving as a template for national dietary guidelines, and there is little to no consensus regarding reference values for different nutrients. The present review compared 27 national dietary guidelines for healthy adults as well as for pregnant and/or breastfeeding women, and analysed their quality and the evidence behind their recommendations. The guidelines were evaluated for their quality using the instrument Agree II, and found to be heterogeneous (overall quality score 14%–100%) and often insufficient (quality score &lt; 50%) due to missing information about their methodology and sources of evidence. We analysed the evidence (number of studies, study types and publication years) of reference values of a number of nutrients using the five guidelines that provided the highest scores in the Agree II assessment. The reference values varied among guidelines, were rarely based on up-to-date meta-analyses, and were often based on insufficiently reported evidence (22/27 guidelines with quality score &lt; 50%). We recommend systematic reviews of high quality studies to formulate future guidelines, and to use guidelines on how to write guidelines.
Impact of Opioid Restrictions During a Critical Drug Shortage Period: Interrupted Time Series for Institutional Opioid Utilization
Authors: Brokenshire Samantha A , Lemon Stephen J , Staley Benjamin , Voils Alissa , Hincapie-Castillo Juan M 
Published: May 2020

Abstract

Objectives
This study aimed to evaluate the impact of intravenous opioid product restrictions at an academic medical institution in an urban setting during the time of critical opioid shortages. We assessed the effect of ordering restrictions on inpatient opioid utilization measured by 1) changes in intermittent oral and injectable opioid product administration; 2) changes in total institutional opioid administration; and 3) changes in the utilization of individual restricted opioid agents.

Methods
This study is a single-center retrospective analysis by interrupted time series of institutional opioid utilization from 07/2017 to 06/2018. Utilization was quantified using milligrams of intravenous morphine equivalent administered or dispensed per admitted patient. Restrictions were grouped into 10 distinct phases, which informed the interruptions in linear regression models.

Results
Sequential restrictions during the study period led to shifts in use of individual agents but did not have a significant impact on overall total opioid utilization. “Soft” restrictions did not have a direct, statistically significant impact on medication use but did decrease utilization over time. In situations where a product was restricted with a “soft stop” followed by a “hard stop,” the “hard stop” directly reduced usage.

Conclusions
Targeted ordering restrictions allowed the institution to redirect drug use according to clinical need without affecting the overall utilization. Clinical decision support led providers to choose therapeutically equivalent alternatives. The demonstrated effect of restrictions will guide institutions in the selection of “hard stop” or “soft stop” restrictions in response to future shortages.