bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aesthetics of Acquisition: Notes on the Transactional Life of Persons and Things in Gabon
Authors: Bernault Florence 
Published: June 2015

AbstractBased on a historical study of older and newer visual regimes in Gabon, Equatorial Africa, this paper examines spectacles as world-manufacturing processes that produce and circulate assets. Visual and aesthetic strategies have often been analyzed as technologies of the self that transform and manifest people's identities. I show here that they also work as a means to create resources and put them into motion. The notion of “aesthetics of acquisition” helps to capture the dynamic energy of visual events and reinsert them into the realms of economic production and material exchange. If spectacles allow people to acquire riches, produce new statuses, and circulate resources, I argue, the process through which this occurs cannot be analytically reduced to a mere commodification of the person. Instead, I explain how aesthetics of acquisition enable institutional and social actors to assume temporary commodity status, a moment and a strategy that I call “transactional life.”
Voices and Votes in the Fields of Settler Society: American Indian Media and Electoral Politics in 1930s Wisconsin
Authors: Arndt Grant 
Published: June 2015

AbstractIn 1939, Wisconsin readers of a weekly newspaper column by Mitchell Redcloud, a member of the Ho-Chunk Indian community settled within the rural township of Komensky, were greeted with a set of headlines from the imaginary “Komensky News” about an actual local event. The headlines reported that despite opposition from local whites, Ho-Chunk people had successfully elected a Ho-Chunk candidate to the township board. This article draws on studies of Indigenous media and recent efforts to develop field-theoretic accounts of social action to understand the interdependence of Redcloud's headlines and the Ho-Chunk vote as part of an incipient project of Indigenous political action. Using census records, I first describe the positions in the everyday field of race and class relations that Ho-Chunk people occupied in Komensky, based on their incomes, educations, and occupational statuses. I then draw on this description to understand Redcloud's position-taking strategies before the election. I next examine Redcloud's writing career in the newspaper to understand his strategy of self-positioning as a marked Indian voice within a print-based discursive field that denigrated other Ho-Chunk voices. I finish by examining new position-taking strategies manifest in the 1939 vote and in Redcloud's turn to headline register. I argue that both media and electoral mechanisms offered relatively autonomous fields that made these experiments with Indigenous action possible despite the absence of tribal political institutions necessary to transform the positions Ho-Chunk people occupied in their everyday lives. Together, the headlines and the election suggest the interdependence of activism carried out in media and in governmental structures in the production of transformative acts of political self-representation.
Tales from the Land of Magic Plants: Textual Ideologies and Fetishes of Indigeneity in Mexico's Sierra Mazateca
Authors: Faudree Paja 
Published: June 2015

AbstractAnthropology and other disciplines are engaged in an extended conversation about how to understand the dynamics of global interconnection. One dominant approach stresses political economies of global markets, exploring how commodity chains structure social relations and vice versa. I propose instead an emphasis on how semiotic mediation, specifically textual representation, shapes the circulation of material goods and surrounding social relations. I draw on ethnographic and archival research concerning the Mazatec region of Oaxaca, where psychedelic plants that local people have long used ritually have more recently become the subject of intense, socially violent consumer interest. I examine recent histories of interest in the region through texts written by outsiders, first “mushroom seekers,” and then Protestant missionary-linguists. Applying Keane's (2003) concept of “semiotic ideologies” to ideas about texts, I suggest that competing textual ideologies undergird conflicts between how outsiders have written about the region and local people have responded to their accounts. The nearly century-deep corpus of writings about the region tends to depict its people through reference to its hallucinogenic plants, a form of “semiotic collapse” wherein the commodities become fetishized proxies for people. Local people, particularly Mazatec authors, react by trying to manage this “representational hangover” from the history of outsider depictions. They adopt strategies to undo the power of the fetish by re-socializing the plants and re-embedding them in local social relations. This analysis offers a fruitful entry point for ethnographies of global connection while furthering the interdisciplinary project of attending jointly to materiality and semiotic representations.
Lucilia cuprina genome unlocks parasitic fly biology to underpin future interventions
Authors: Anstead Clare A. , Korhonen Pasi K. , Young Neil D. , Hall Ross S. , Jex Aaron R. , Murali Shwetha C. , Hughes Daniel S.T. , Lee Siu F. , Perry Trent , Stroehlein Andreas J. , Ansell Brendan R.E. , Breugelmans Bert , Hofmann Andreas , Qu Jiaxin , Dugan Shannon , Lee Sandra L. , Chao Hsu , Dinh Huyen , Han Yi , Doddapaneni Harsha V. , Worley Kim C. , Muzny Donna M. , Ioannidis Panagiotis , Waterhouse Robert M. , Zdobnov Evgeny M. , James Peter J. , Bagnall Neil H. , Kotze Andrew C. , Gibbs Richard A. , Richards Stephen , Batterham Philip , Gasser Robin B. 
Published: June 2015

AbstractLucilia cuprina is a parasitic fly of major economic importance worldwide. Larvae of this fly invade their animal host, feed on tissues and excretions and progressively cause severe skin disease (myiasis). Here we report the sequence and annotation of the 458-megabase draft genome of Lucilia cuprina. Analyses of this genome and the 14,544 predicted protein-encoding genes provide unique insights into the fly’s molecular biology, interactions with the host animal and insecticide resistance. These insights have broad implications for designing new methods for the prevention and control of myiasis.
Lead iodide perovskite light-emitting field-effect transistor
Authors: Chin Xin Yu , Cortecchia Daniele , Yin Jun , Bruno Annalisa , Soci Cesare 
Published: June 2015

AbstractDespite the widespread use of solution-processable hybrid organic–inorganic perovskites in photovoltaic and light-emitting applications, determination of their intrinsic charge transport parameters has been elusive due to the variability of film preparation and history-dependent device performance. Here we show that screening effects associated to ionic transport can be effectively eliminated by lowering the operating temperature of methylammonium lead iodide perovskite (CH3NH3PbI3) field-effect transistors. Field-effect carrier mobility is found to increase by almost two orders of magnitude below 200 K, consistent with phonon scattering-limited transport. Under balanced ambipolar carrier injection, gate-dependent electroluminescence is also observed from the transistor channel, with spectra revealing the tetragonal to orthorhombic phase transition. This demonstration of CH3NH3PbI3 light-emitting field-effect transistors provides intrinsic transport parameters to guide materials and solar cell optimization, and will drive the development of new electro-optic device concepts, such as gated light-emitting diodes and lasers operating at room temperature.
Piezoelectric effect in chemical vapour deposition-grown atomic-monolayer triangular molybdenum disulfide piezotronics
Authors: Qi Junjie , Lan Yann-Wen , Stieg Adam Z. , Chen Jyun-Hong , Zhong Yuan-Liang , Li Lain-Jong , Chen Chii-Dong , Zhang Yue , Wang Kang L. 
Published: June 2015

AbstractHigh-performance piezoelectricity in monolayer semiconducting transition metal dichalcogenides is highly desirable for the development of nanosensors, piezotronics and photo-piezotransistors. Here we report the experimental study of the theoretically predicted piezoelectric effect in triangle monolayer MoS2 devices under isotropic mechanical deformation. The experimental observation indicates that the conductivity of MoS2 devices can be actively modulated by the piezoelectric charge polarization-induced built-in electric field under strain variation. These polarization charges alter the Schottky barrier height on both contacts, resulting in a barrier height increase with increasing compressive strain and decrease with increasing tensile strain. The underlying mechanism of strain-induced in-plane charge polarization is proposed and discussed using energy band diagrams. In addition, a new type of MoS2 strain/force sensor built using a monolayer MoS2 triangle is also demonstrated. Our results provide evidence for strain-gating monolayer MoS2 piezotronics, a promising avenue for achieving augmented functionalities in next-generation electronic and mechanical–electronic nanodevices.
Printable elastic conductors with a high conductivity for electronic textile applications
Authors: Matsuhisa Naoji , Kaltenbrunner Martin , Yokota Tomoyuki , Jinno Hiroaki , Kuribara Kazunori , Sekitani Tsuyoshi , Someya Takao 
Published: June 2015

AbstractThe development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes. Here we report a printable elastic conductor with a high initial conductivity of 738 S cm−1 and a record high conductivity of 182 S cm−1 when stretched to 215% strain. The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant. The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability. We demonstrate the feasibility of our inks by fabricating a stretchable organic transistor active matrix on a rubbery stretchability-gradient substrate with unimpaired functionality when stretched to 110%, and a wearable electromyogram sensor printed onto a textile garment.
Superstatistical analysis and modelling of heterogeneous random walks
Authors: Metzner Claus , Mark Christoph , Steinwachs Julian , Lautscham Lena , Stadler Franz , Fabry Ben 
Published: June 2015

AbstractStochastic time series are ubiquitous in nature. In particular, random walks with time-varying statistical properties are found in many scientific disciplines. Here we present a superstatistical approach to analyse and model such heterogeneous random walks. The time-dependent statistical parameters can be extracted from measured random walk trajectories with a Bayesian method of sequential inference. The distributions and correlations of these parameters reveal subtle features of the random process that are not captured by conventional measures, such as the mean-squared displacement or the step width distribution. We apply our new approach to migration trajectories of tumour cells in two and three dimensions, and demonstrate the superior ability of the superstatistical method to discriminate cell migration strategies in different environments. Finally, we show how the resulting insights can be used to design simple and meaningful models of the underlying random processes.
Nanoscale control of phonon excitations in graphene
Authors: Kim Hyo Won , Ko Wonhee , Ku JiYeon , Jeon Insu , Kim Donggyu , Kwon Hyeokshin , Oh Youngtek , Ryu Seunghwa , Kuk Young , Hwang Sung Woo , Suh Hwansoo 
Published: June 2015

AbstractPhonons, which are collective excitations in a lattice of atoms or molecules, play a major role in determining various physical properties of condensed matter, such as thermal and electrical conductivities. In particular, phonons in graphene interact strongly with electrons; however, unlike in usual metals, these interactions between phonons and massless Dirac fermions appear to mirror the rather complicated physics of those between light and relativistic electrons. Therefore, a fundamental understanding of the underlying physics through systematic studies of phonon interactions and excitations in graphene is crucial for realising graphene-based devices. In this study, we demonstrate that the local phonon properties of graphene can be controlled at the nanoscale by tuning the interaction strength between graphene and an underlying Pt substrate. Using scanning probe methods, we determine that the reduced interaction due to embedded Ar atoms facilitates electron–phonon excitations, further influencing phonon-assisted inelastic electron tunnelling.
Single-site trinuclear copper oxygen clusters in mordenite for selective conversion of methane to methanol
Authors: Grundner Sebastian , Markovits Monica A.C. , Li Guanna , Tromp Moniek , Pidko Evgeny A. , Hensen Emiel J.M. , Jentys Andreas , Sanchez-Sanchez Maricruz , Lercher Johannes A. 
Published: June 2015

AbstractCopper-exchanged zeolites with mordenite structure mimic the nuclearity and reactivity of active sites in particulate methane monooxygenase, which are enzymes able to selectively oxidize methane to methanol. Here we show that the mordenite micropores provide a perfect confined environment for the highly selective stabilization of trinuclear copper-oxo clusters that exhibit a high reactivity towards activation of carbon–hydrogen bonds in methane and its subsequent transformation to methanol. The similarity with the enzymatic systems is also implied from the similarity of the reversible rearrangements of the trinuclear clusters occurring during the selective transformations of methane along the reaction path towards methanol, in both the enzyme system and copper-exchanged mordenite.
IL-21 induces antiviral microRNA-29 in CD4 T cells to limit HIV-1 infection
Authors: Adoro Stanley , Cubillos-Ruiz Juan R. , Chen Xi , Deruaz Maud , Vrbanac Vladimir D. , Song Minkyung , Park Suna , Murooka Thomas T. , Dudek Timothy E. , Luster Andrew D. , Tager Andrew M. , Streeck Hendrik , Bowman Brittany , Walker Bruce D. , Kwon Douglas S. , Lazarevic Vanja , Glimcher Laurie H. 
Published: June 2015

AbstractInitial events after exposure determine HIV-1 disease progression, underscoring a critical need to understand host mechanisms that interfere with initial viral replication. Although associated with chronic HIV-1 control, it is not known whether interleukin-21 (IL-21) contributes to early HIV-1 immunity. Here we take advantage of tractable primary human lymphoid organ aggregate cultures to show that IL-21 directly suppresses HIV-1 replication, and identify microRNA-29 (miR-29) as an antiviral factor induced by IL-21 in CD4 T cells. IL-21 promotes transcription of all miR-29 species through STAT3, whose binding to putative regulatory regions within the MIR29 gene is enriched by IL-21 signalling. Notably, exogenous IL-21 limits early HIV-1 infection in humanized mice, and lower viremia in vivo is associated with higher miR-29 expression. Together, these findings reveal a novel antiviral IL-21-miR-29 axis that promotes CD4 T-cell-intrinsic resistance to HIV-1 infection, and suggest a role for IL-21 in initial HIV-1 control in vivo.
Understanding nanocellulose chirality and structure–properties relationship at the single fibril level
Authors: Usov Ivan , Nyström Gustav , Adamcik Jozef , Handschin Stephan , Schütz Christina , Fall Andreas , Bergström Lennart , Mezzenga Raffaele 
Published: June 2015

AbstractNanocellulose fibrils are ubiquitous in nature and nanotechnologies but their mesoscopic structural assembly is not yet fully understood. Here we study the structural features of rod-like cellulose nanoparticles on a single particle level, by applying statistical polymer physics concepts on electron and atomic force microscopy images, and we assess their physical properties via quantitative nanomechanical mapping. We show evidence of right-handed chirality, observed on both bundles and on single fibrils. Statistical analysis of contours from microscopy images shows a non-Gaussian kink angle distribution. This is inconsistent with a structure consisting of alternating amorphous and crystalline domains along the contour and supports process-induced kink formation. The intrinsic mechanical properties of nanocellulose are extracted from nanoindentation and persistence length method for transversal and longitudinal directions, respectively. The structural analysis is pushed to the level of single cellulose polymer chains, and their smallest associated unit with a proposed 2 × 2 chain-packing arrangement.
The first crop plant genetically engineered to release an insect pheromone for defence
Authors: Bruce Toby J.A. , Aradottir Gudbjorg I. , Smart Lesley E. , Martin Janet L. , Caulfield John C. , Doherty Angela , Sparks Caroline A. , Woodcock Christine M. , Birkett Michael A. , Napier Johnathan A. , Jones Huw D. , Pickett John A. 
Published: June 2015

AbstractInsect pheromones offer potential for managing pests of crop plants. Volatility and instability are problems for deployment in agriculture but could be solved by expressing genes for the biosynthesis of pheromones in the crop plants. This has now been achieved by genetically engineering a hexaploid variety of wheat to release (E)-β-farnesene (Eβf), the alarm pheromone for many pest aphids, using a synthetic gene based on a sequence from peppermint with a plastid targeting amino acid sequence, with or without a gene for biosynthesis of the precursor farnesyl diphosphate. Pure Eβf was produced in stably transformed wheat lines with no other detectable phenotype but requiring targeting of the gene produced to the plastid. In laboratory behavioural assays, three species of cereal aphids were repelled and foraging was increased for a parasitic natural enemy. Although these studies show considerable potential for aphid control, field trials employing the single and double constructs showed no reduction in aphids or increase in parasitism. Insect numbers were low and climatic conditions erratic suggesting the need for further trials or a closer imitation, in the plant, of alarm pheromone release.
The stage-classified matrix models project a significant increase in biomass carbon stocks in China’s forests between 2005 and 2050
Authors: Hu Huifeng , Wang Shaopeng , Guo Zhaodi , Xu Bing , Fang Jingyun 
Published: June 2015

AbstractChina’s forests are characterized by young age, low carbon (C) density and a large plantation area, implying a high potential for increasing C sinks in the future. Using data of provincial forest area and biomass C density from China’s forest inventories between 1994 and 2008 and the planned forest coverage of the country by 2050, we developed a stage-classified matrix model to predict biomass C stocks of China’s forests from 2005 to 2050. The results showed that total forest biomass C stock would increase from 6.43 Pg C (1 Pg = 1015 g) in 2005 to 9.97 Pg C (95% confidence interval: 8.98 ~ 11.07 Pg C) in 2050, with an overall net C gain of 78.8 Tg C yr−1 (56.7 ~ 103.3 Tg C yr−1; 1 Tg = 1012 g). Our findings suggest that China’s forests will be a large and persistent biomass C sink through 2050.
A new mechanism for low and temperature-independent elastic modulus
Authors: Zhang Liangxiang , Wang Dong , Ren Xiaobing , Wang Yunzhi 
Published: June 2015

AbstractThe first Elinvar alloy, FeNiCr, which has invariant elastic modulus over a wide temperature range, was discovered almost 100 years ago by Guillaume. The physical origin of such an anomaly has been attributed to the magnetic phase transition taking place in the system. However, the recent discovery of non-magnetic Elinvar such as multi-functional β-type Ti alloys has imposed a new challenge to the existing theories. In this study we show that random field from stress-carrying defects could suppress the sharp first-order martensitic transformation into a continuous strain glass transition, leading to continued formation and confined growth of nano-domains of martensite in a broad temperature range. Accompanying such a unique transition, there is a gradual softening of the elastic modulus over a wide temperature range, which compensates the normal modulus hardening due to anharmonic atomic vibration, resulting in a low and temperature-independent elastic modulus. The abundance of austenite/martensite interfaces are found responsible for the low elastic modulus.
Molecular and neuronal homology between the olfactory systems of zebrafish and mouse
Authors: Saraiva Luis R. , Ahuja Gaurav , Ivandic Ivan , Syed Adnan S. , Marioni John C. , Korsching Sigrun I. , Logan Darren W. 
Published: June 2015

AbstractStudies of the two major olfactory organs of rodents, the olfactory mucosa (OM) and the vomeronasal organ (VNO), unraveled the molecular basis of smell in vertebrates. However, some vertebrates lack a VNO. Here we generated and analyzed the olfactory transcriptome of the zebrafish and compared it to the olfactory transcriptomes of mouse to investigate the evolutionary and molecular relationship between single and dual olfactory systems. Our analyses revealed a high degree of molecular conservation, with orthologs of mouse olfactory cell-specific markers and all but one of their chemosensory receptor classes expressed in the single zebrafish olfactory organ. Zebrafish chemosensory receptor genes are expressed across a large dynamic range and their RNA abundance correlates positively with the number of neurons expressing that RNA. Thus we estimate the relative proportions of neuronal sub-types expressing different chemosensory receptors. Receptor repertoire size drives the absolute abundance of different classes of neurons, but we find similar underlying patterns in both species. Finally, we identified novel marker genes that characterize rare neuronal populations in both mouse and zebrafish. In sum, we find that the molecular and cellular mechanisms underpinning olfaction in teleosts and mammals are similar despite 430 million years of evolutionary divergence.
Portuguese Man-of-War (Physalia physalis) in the Mediterranean: A permanent invasion or a casual appearance?
Authors: Prieto L. , Macías D. , Peliz A. , Ruiz J. 
Published: June 2015

AbstractIn 2010, the Mediterranean basin experienced Portuguese Man-of-War (Physalia physalis) swarms that had dramatic consequences, including the region’s first recorded human fatality attributed to a jellyfish sting. Despite the impact of jellyfish on coastal economic activity and the importance of the tourism industry for the Mediterranean region (accounting for 15% of global tourism), no scientific consensus has been achieved regarding the causes of this episode. Here, we analyse the meteorological and oceanographic conditions of the North-East Atlantic Ocean during the months previous to the appearance of P. physalis in the Mediterranean. We simulate the probable drift of Atlantic populations into the Mediterranean basin with a numerical model and compare model results with available observations. We conclude that the summer 2010 P. Physalis swarm was the result of an unusual combination of meteorological and oceanographic conditions during the previous winter and not a permanent invasion favoured by climatic changes.