bluuebunny/crossref_metadata_2025_split huggingface dataset:
Authoritarian Signaling, Mass Audiences, and Nationalist Protest in China
Authors: Weiss Jessica Chen 
Published: January 2013

AbstractHow can authoritarian states credibly signal their intentions in international crises? Nationalist, antiforeign protests are one mechanism by which authoritarian leaders can visibly demonstrate their domestic vulnerability. Because protests in authoritarian states are risky and costly to repress, the decision to allow or stifle popular mobilization is informative. The threat of instability demonstrates resolve, and the cost of concession increases the credibility of a tough stance. The danger of instability and escalation increases foreign incentives to make concessions and preserve the status quo. This logic helps explain the pattern of authoritarian tolerance and repression toward nationalist protest. A case study of two U.S.-China crises shows how China's management of anti-American protests affected U.S. beliefs about Chinese resolve.
Derivation of radial electric fields using kinetic theory in tokamak
Authors: NOORI K. , KHORSHID P. , AFSARI M. 
Published: January 2013

AbstractIn the current study, radial electric field with fluid equations has been calculated. The calculation started with kinetic theory, Boltzmann and momentum balance equations were derived, the negligible terms compared with others were eliminated, and the radial electric field expression in steady state was derived. As mentioned in previous researches, this expression includes all types of particles such as electrons, ions, and neutrals. The consequence of this solution reveals that three major driving forces contribute in radial electric field: radial pressure gradient, poloidal rotation, and toroidal rotation; rotational terms mean Lorentz force. Therefore, radial electric field and plasma rotation are connected through the radial momentum balance.
The scaling of reconnection rate in the two-fluid model of a collisionless forced magnetic reconnection
Authors: HOSSEINPOUR M. 
Published: January 2013

AbstractThe two-fluid model of collisionless forced magnetic reconnection is considered where breaking the frozen-in flow constraint for magnetic field lines is provided by electron inertia. Following the Taylor problem, a tearing stable slab of plasma with a magnetic field reversal is subjected to a small-amplitude boundary perturbation that drives magnetic reconnection at the neutral surface within the plasma. It has been shown that unlike the resistive regime, where the two-fluid magnetohydrodynamics (MHD) description reduces to the single-fluid MHD regime at sufficiently small values of the ion inertial skin-depth, di ≡ c/ωpi (with ωpi as the ion plasma frequency), there is no room for the single-fluid MHD reconnection in the collisionless case, even at very small values of di. Meanwhile, contradictory to the resistive reconnection, the rate of collisionless Hall reconnection always decreases with time as reconnection proceeds. In particular, in the main stage of Hall reconnection, when transition between two main equilibria states are taking place, it scales as t−1/2.
Explaining Moral Variety
Authors: Kukathas Chandran 
Published: January 2013

Reflection on the variety of forms of social life has long been a source of moral skepticism. The thought that there are many radically different social systems, each of which colors the way its members think about moral and political questions, has been thought by many moral philosophers to undermine confidence in our belief that our way of looking at-or even posing-these questions is the correct one. The fact of cultural variety is held to reduce, if not eliminate altogether, the possibility of moral criticism of the practices of other societies. This thought is not a recent one; it is implicit, for example, in an observation made in David Hume's “A Dialogue,” when he writes:There are no manners so innocent or reasonable, but may be rendered odious or ridiculous, if measured by a standard, unknown to the persons; especially, if you employ a little art or eloquence, in aggravating some circumstances, and extenuating others, as best suits the purpose of your discourse.
Average Frobenius distribution for the degree two primes of a number field
Authors: JAMES KEVIN , SMITH ETHAN 
Published: January 2013

AbstractLet K be a number field and r an integer. Given an elliptic curve E, defined over K, we consider the problem of counting the number of degree two prime ideals of K with trace of Frobenius equal to r. Under certain restrictions on K, we show that “on average” the number of such prime ideals with norm less than or equal to x satisfies an asymptotic identity that is in accordance with standard heuristics. This work is related to the classical Lang–Trotter conjecture and extends the work of several authors.
Sur les solutions friables de l'équation a+b=c
Authors: DRAPPEAU SARY 
Published: January 2013

AbstractIn a recent paper [5], Lagarias and Soundararajan study the y-smooth solutions to the equation a+b=c. Conditionally under the Generalised Riemann Hypothesis, they obtain an estimate for the number of those solutions weighted by a compactly supported smooth function, as well as a lower bound for the number of bounded unweighted solutions. In this paper, we prove a more precise conditional estimate for the number of weighted solutions that is valid when y is relatively large with respect to x, so as to connect our estimate with the one obtained by La Bretèche and Granville in a recent work [2]. We also prove, conditionally under the Generalised Riemann Hypothesis, the conjectured upper bound for the number of bounded unweighted solutions, thus obtaining its exact asymptotic behaviour.
The space of immersed surfaces in a manifold
Authors: RANDAL–WILLIAMS OSCAR 
Published: January 2013

AbstractWe study the cohomology of the space of immersed genusgsurfaces in a simply-connected manifold. We compute the rational cohomology of this space in a stable range which goes to infinity withg. In fact, in this stable range we are also able to obtain information about torsion in the cohomology of this space, as long as we localise away from (g-1).
Valuing marine parks in a small island developing state: a travel cost analysis in Seychelles
Authors: Mwebaze Paul , MacLeod Alan 
Published: January 2013

AbstractA major problem facing the Seychelles islands is the decline in the quality and the value of marine protected areas (MPAs). Economic valuation can help guide policy makers to understand the value of marine resources and the cost of neglecting MPAs by expressing the value of their goods and services in monetary terms. This paper presents an analysis of the economic value of a group of marine parks in Seychelles. The travel cost method is used to establish willingness-to-pay of international tourists for trips to marine parks in Seychelles from their observed behaviour. The average per-trip consumer surplus is approximately €128 for single-site visitors and €65 for multiple-site visitors. The total social welfare value attributable to the recreational opportunity in marine parks is approximately €3.7 million annually. These results provide policy makers with a strong justification for government investment needed to maintain marine sites in Seychelles.
Clostridium difficilein foods and animals: history and measures to reduce exposure
Authors: Rodriguez-Palacios Alex , Borgmann Stefan , Kline Terence R. , LeJeune Jeffrey T. 
Published: January 2013

AbstractMany articles have summarized the changing epidemiology ofClostridium difficileinfections (CDI) in humans, but the emerging presence ofC. difficilein foods and animals and possible measures to reduce human exposure to this important pathogen have been infrequently addressed. CDIs have traditionally been assumed to be restricted to health-care settings. However, recent molecular studies indicate that this is no longer the case; animals and foods might be involved in the changing epidemiology of CDIs in humans; and genome sequencing is disproving person-to-person transmission in hospitals. Although zoonotic and foodborne transmission have not been confirmed, it is evident that susceptible people can be inadvertently exposed toC. difficilefrom foods, animals, or their environment. Strains of epidemic clones present in humans are common in companion and food animals, raw meats, poultry products, vegetables, and ready-to-eat foods, including salads. In order to develop science-based prevention strategies, it is critical to understand howC. difficilereaches foods and humans. This review contextualizes the current understanding of CDIs in humans, animals, and foods. Based on available information, we propose a list of educational measures that could reduce the exposure of susceptible people toC. difficile. Enhanced educational efforts and behavior change targeting medical and non-medical personnel are needed.
Organic grain cropping systems to enhance ecosystem services
Authors: Cavigelli Michel A. , Mirsky Steven B. , Teasdale John R. , Spargo John T. , Doran John 
Published: January 2013

AbstractOrganic grain cropping systems can enhance a number of ecosystem services compared with conventional tilled (CT) systems. Recent results from a limited number of long-term agricultural research (LTAR) studies suggest that organic grain cropping systems can also increase several ecosystem services relative to conventional no-till (NT) cropping systems: soil C sequestration and soil N fertility (N mineralization potential) can be greater while global warming potential (GWP) can be lower in organic systems that use animal manures and cover crops compared with conventional NT systems. However, soil erosion from organic systems and nitrous oxide (N2O, a greenhouse gas) emissions from manure-based organic systems appear to be greater than from conventional NT systems, though data are limited. Also, crop yields, on average, continue to be lower and labor requirements greater in organic than in both tilled and NT conventional systems. Ecosystem services provided by organic systems may be improved by expanding crop rotations to include greater crop phenological diversity, improving nutrient management, and reducing tillage intensity and frequency. More diverse crop rotations, especially those that include perennial forages, can reduce weed pressure, economic risk, soil erosion, N2O emissions, animal manure inputs, and soil P loading, while increasing grain yield and soil fertility. Side-dressing animal manures in organic systems may increase corn nitrogen use efficiency and also minimize animal manure inputs. Management practices that reduce tillage frequency and intensity in organic systems are being developed to reduce soil erosion and labor and energy needs. On-going research promises to further augment ecosystem services provided by organic grain cropping systems.
Die Symptomstruktur des BDI-II: Kernsymptome und qualitative Facetten
Authors: Bühler Joël , Keller Ferdinand , Läge Damian 
Published: January 2013

Theoretischer Hintergrund: Das BDI-II deckt mit 21 Depressionssymptomen die Breite der Depression ab und ist geeignet, die Symptomstruktur der Depression zu erforschen. Eine Vielzahl an faktorenanalytischen Studien erbrachte aber bislang keinen Konsens. Fragestellung: Nonmetrische Multidimensionale Skalierung (NMDS) soll daher die divergierenden Resultate einordnen und ein Modell der Symptomstruktur schaffen. Methode: Mittels NMDS wird die Symptomstruktur des BDI‐II (N = 266 Depressive) in einen 2‐dimensionalen Raum abgebildet. Ergebnisse: Die NMDS‐Lösung legt eine Facettenstruktur nahe, welche von den faktorenanalytischen Modellen bislang unzulänglich erfasst wird. Schlussfolgerungen: Neben einem generellen Kernsyndrom finden sich fünf spezifische Facetten (verminderte Aktivierung, psychovegetative Symptome, gesteigerte Aktivierung, Hoffnungslosigkeit und negative Einstellung zum Selbst), die die Heterogenität der Symptomatik innerhalb der Depression aufzeigen und damit die Existenz von Subtypen in der Depression nahelegen.
EPR approaches to disorder in proteins
Authors: Huber Martina 
Published: January 2013

Nature can be messy. Disorder often accompanies natural processes and in some cases may even be required for function. For biochemical and biophysical techniques, disordered systems are challenging, to the degree that traditional methods of structure determination either cannot be applied at all, or are severely limited. The methods suffer from broadening effects due to heterogeneity and multi-component spectra are often impossible to interpret.
The growing understanding that disorder and heterogeneity are important in biological processes and the increasing evidence that disordered regions in proteins may be functional,1 make it timely to take a current-day look at these subjects. The discovery in 19982 of intrinsically disordered proteins, or of proteins that function on account of disordered regions,3 is reflected in a textbook.4 Fig. 1 shows in a cartoon-fashion the interactions and different conformations that flexible proteins can adopt.
Emergence of clones in sexual populations
Authors: Neher Richard A , Vucelja Marija , Mezard Mark , Shraiman Boris I 
Published: January 2013

Abstract
In sexual population, recombination reshuffles genetic variation and produces novel combinations of existing alleles, while selection amplifies the fittest genotypes in the population. If recombination is more rapid than selection, populations consist of a diverse mixture of many genotypes, as is observed in many populations. In the opposite regime, which is realized for example in the facultatively sexual populations that outcross in only a fraction of reproductive cycles, selection can amplify individual genotypes into large clones. Such clones emerge when the fitness advantage of some of the genotypes is large enough that they grow to a significant fraction of the population despite being broken down by recombination. The occurrence of this ‘clonal condensation’ depends, in addition to the outcrossing rate, on the heritability of fitness. Clonal condensation leads to a strong genetic heterogeneity of the population which is not adequately described by traditional population genetics measures, such as linkage disequilibrium. Here we point out the similarity between clonal condensation and the freezing transition in the random energy model of spin glasses. Guided by this analogy we explicitly calculate the probability, Y, that two individuals are genetically identical as a function of the key parameters of the model. While Y is the analog of the spin-glass order parameter, it is also closely related to rate of coalescence in population genetics: two individuals that are part of the same clone have a recent common ancestor.
Total Phenolic Content and Antioxidant Capacity of Germinated, Popped, and Cooked Huauzontle (Chenopodium berlandieri spp. nuttalliae) Seeds
Authors: Martinez L. Chaires , Vargas M. A. Perez , del Angel A. I. Cantor , Bermudez F. Cruz , Avalos H. A. Jimenez 
Published: January 2013

ABSTRACTRaw, germinated, popped, and cooked huauzontle (Chenopodium berlandieri spp. nuttalliae) seeds were analyzed for the contents of phenolics extracted with water (WE), methanol, 1:1 (v/v) methanol/water (MWE), and 1.2M HCl in 1:1 (v/v) methanol/water (HMWE); radical scavenging capacity measured by the 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid) (ABTS) methods was studied. The effect of the system solvents used for the accurate quantification of antioxidant content and capacity showed that for raw, germinated, and cooked extracts, water gave the highest yield of total phenolic content, and MWE could recover the highest yield in popped extracts. Thermal treatments increased the flavonoid content more in all extracts than did the germinating process, with values ranging from 10 to 620 μg/g db of quercetin equivalents. However, all treatments significantly decreased (P < 0.05) the total phenolics (from 3,010 μg of gallic acid equivalents/g db in raw seeds WE to 710 μg/g db in germinated seeds MWE). HMWE in all treatments showed the highest values (up to 95.41%) by the DPPH method. With the ABTS method, germinated and popped MWE showed the highest values (up to 2,740mM Trolox/kg db). Based on these results, huauzontle seeds represent a useful potential ingredient for consumer health, because it has been shown to be a good source of total phenolic content having high antioxidant activity; moreover, for further studies, water appears to be effective as an extraction solvent of phenolic compounds.
Effects of Preharvest Nighttime Air Temperatures on Whiteness of Head Rice
Authors: Lanning Sarah , Siebenmorgen Terry 
Published: January 2013

ABSTRACTThe effects of nighttime air temperature (NTAT) on the color of milled rice were investigated. Elevated NTATs occurring during the critical grain‐filling stages of kernel development impacted the color of head rice. Six cultivars, grown at multiple field locations from northern to southern Arkansas during 2007–2010, were evaluated for head rice color, using whiteness (L*) and yellowness (b*) indices, and for chalk. Nighttime temperatures were recorded throughout production at each of the selected locations, and the 95th percentiles of NTAT frequencies (NT95) were calculated for each cultivar's reproductive (R) stages. Head rice color values were analyzed in relation to NT95 occurring during the grain‐filling (R6–R8) stages and in relation to percent chalkiness. Whiteness generally increased with increasing NTAT and with increasing chalkiness. Yellowness decreased as chalkiness increased. Moreover, kernel whiteness increased even when measured in the absence of chalky kernels, suggesting that starch granule organization throughout the kernel, even in nonchalky portions, was altered, which could result in compromised physical integrity and processing functionality. Cultivars varied in their susceptibility to the effect of NTAT on color, as has been previously demonstrated with milling quality and functional properties.
Antagonistic Peptide Technology for Functional Dissection ofCLV3/ESRGenes in Arabidopsis
Authors: Song Xiu-Fen , Guo Peng , Ren Shi-Chao , Xu Ting-Ting , Liu Chun-Ming 
Published: January 2013

AbstractIn recent years, peptide hormones have been recognized as important signal molecules in plants. Genetic characterization of such peptides is challenging since they are usually encoded by small genes. As a proof of concept, we used the well-characterized stem cell-restricting CLAVATA3 (CLV3) to develop an antagonistic peptide technology by transformations of wild-type Arabidopsis (Arabidopsis thaliana) with constructs carrying the full-length CLV3 with every residue in the peptide-coding region replaced, one at a time, by alanine. Analyses of transgenic plants allowed us to identify one line exhibiting a dominant-negative clv3-like phenotype, with enlarged shoot apical meristems and increased numbers of floral organs. We then performed second dimensional amino acid substitutions to replace the glycine residue individually with the other 18 possible proteinaceous amino acids. Examination of transgenic plants showed that a glycine-to-threonine substitution gave the strongest antagonistic effect in the wild type, in which over 70% of transgenic lines showed the clv3-like phenotype. Among these substitutions, a negative correlation was observed between the antagonistic effects in the wild type and the complementation efficiencies in clv3. We also demonstrated that such an antagonistic peptide technology is applicable to other CLV3/EMBRYO SURROUNDING REGION (CLE) genes, CLE8 and CLE22, as well as in vitro treatments. We believe this technology provides a powerful tool for functional dissection of widely occurring CLE genes in plants.
Wheat Oxophytodienoate Reductase GeneTaOPR1Confers Salinity Tolerance via Enhancement of Abscisic Acid Signaling and Reactive Oxygen Species Scavenging
Authors: Dong Wei , Wang Mengcheng , Xu Fei , Quan Taiyong , Peng Keqin , Xiao Langtao , Xia Guangmin 
Published: January 2013

AbstractThe 12-oxo-phytodienoic acid reductases (OPRs) are classified into the two subgroups OPRI and OPRII. The latter proteins participate in jasmonic acid synthesis, while the function of the former ones is as yet unclear. We describe here the characterization of the OPRI gene TaOPR1, isolated from the salinity-tolerant bread wheat (Triticum aestivum) cultivar SR3. Salinity stress induced a higher level of TaOPR1 expression in the seedling roots of cv SR3 than in its parental cultivar, JN177. This induction was abolished when abscisic acid (ABA) synthesis was inhibited. The overexpression of TaOPR1 in wheat significantly enhanced the level of salinity tolerance, while its heterologous expression in Arabidopsis alleviated root growth restriction in the presence of salinity and oxidants and raised the sensitivity to ABA. In Arabidopsis, TaOPR1 promoted ABA synthesis and the ABA-dependent stress-responsive pathway, partially rescued the sensitivity of the Arabidopsis aba2 mutant defective in ABA synthesis to salinity, and improved the activities of reactive oxygen species scavengers and the transcription of their encoding genes while reducing malondialdehyde and reactive oxygen species levels. TaOPR1 did not interact with jasmonate synthesis or the jasmonate signaling pathway. Rather than serving purely as an antioxidant, we believe that TaOPR1 acts during episodes of abiotic stress response as a signaling compound associated with the regulation of the ABA-mediated signaling network.
Decontamination of Salmonella, Shigella, and Escherichia coli O157:H7 from Leafy Green Vegetables Using Edible Plant Extracts
Authors: Orue Nydia , García Santos , Feng Peter , Heredia Norma 
Published: January 2013

Abstract Fresh cilantro, parsley, and spinach are products that are regularly consumed fresh, but are difficult to decontaminate, as a result, they are common vehicles of transmission of enteropathogenic bacteria. In this study, the efficacy of plant extracts as alternatives for disinfection of cilantro, parsley, and spinach that were artificially contaminated with Salmonella, Escherichia coli O157:H7, and Shigella sonnei was determined. Edible plant extracts obtained using ethanol as the extraction solvent were tested to determine the minimum bactericidal concentration (MBC) and those that exhibited the lowest MBC were selected for further studies. Leaves of fresh greens were washed with sterile water and dried. For seeding, leaves were submerged in suspensions of 2 different concentrations of bacteria (1.5 × 108 and 1 × 105), dried, and then stored at 4 °C until use. To determine the effects of the extracts, inoculated leafy greens were submerged in a container and subjected to treatments with chlorine, Citrol®, or selected plant extracts. Each treatment type was stored at 4 °C for 0, 1, 5, and 7 d, and the bacterial counts were determined. From the 41 plant extracts tested, the extracts from oregano leaves and from the peel and pulp of limes were found to be as effective as chlorine or Citrol® in reducing by > 2 logs, the population of pathogenic bacteria on leafy greens and therefore, may be a natural and edible alternative to chemicals to reduce the risk of Salmonella, E. coli O157:H7 and S. sonnei contamination on leafy vegetables.Practical Application:  The antimicrobial efficacy of the extracts of Mexican lime and oregano was clearly demonstrated on cilantro, parsley, and spinach. The extracts of Mexican lime and oregano provide alternatives to chlorine to significantly reduce bacterial pathogens that have been associated with outbreaks from contaminated leafy green vegetables. A simple, low cost, and labor‐saving extraction system for production of the extracts was used.