bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stable oxygen and hydrogen isotopes as indicators of lake water recharge and evaporation in the lakes of the Yinchuan Plain
Authors: Qian Hui , Wu Jianhua , Zhou Yahong , Li Peiyue 
Published: May 2013

AbstractThe Yinchuan Plain has more than 2000 years of history of irrigation by diverting water from the Yellow River. Currently, the amount of water diverted from the Yellow River is about 21.7 times the water formed on the plain as a result of precipitation and inflow of groundwater. Under the intensive influence of irrigation, the plain changed from a desert into a rich and populous area, earning its name as ‘South China Beyond the Great Wall’, with lakes scattered across the Yinchuan Plain just as stars in the sky. In this research, 17 representative lakes were sampled to analyze and study 2H and 18O content; the results showed that lakes on the plain have undergone obvious non‐equilibrium evaporation. Recharges of the lakes can be divided into three types: recharge from the Yellow River, from groundwater and from both of these. The Craig–Gordon non‐equilibrium evaporation model for isotope fractionation was used to estimate the evaporation proportion of each lake. The results showed that evaporation from lakes on Yinchuan Plain is generally extensive under the dry climatic conditions. Most lakes have an evaporation proportion of over 25%, with the largest originating from Shahu lake and Gaomiaohu lake in the northern part of the plain, at 42.5% and 42.8%, respectively. The evaporation proportions calculated on the basis of 18O and 2H are very close to each other. This shows that the method used in this paper is feasible for estimating the evaporation proportions of lakes in areas with a heavy anthropogenic influence. Copyright © 2013 John Wiley & Sons, Ltd.
Nitrogen determination by SEM‐EDS and elemental analysis
Authors: Gazulla M.F. , Rodrigo M. , Blasco E. , Orduña M. 
Published: May 2013

This paper describes a methodology for the analysis of nitrogen by scanning electron microscope with an energy dispersive X‐ray spectrometer (SEM‐EDS). The methodology was developed to have a rapid and accurate alternative method to the elemental analysis by combustion and thermoconductivity detection that does not imply the decomposition of the sample.Two methods by SEM‐EDS were established: a quantitative method trying to construct a calibration curve with reference materials and another using the standardless method provided with the instrument software, and the results were compared with those obtained by elemental analysis using two instruments that work at different temperature. An important matrix effect was found when trying to construct a calibration curve for SEM‐EDS for any kind of material, being corrected when using the standardless method because this method corrects the matrix effect.The quantification of nitrogen by SEM‐EDS is a good alternative to elemental analysis by combustion and thermoconductivity detection in those cases where the sample has a very high decomposition temperature. Copyright © 2013 John Wiley & Sons, Ltd.
Nonlinear Electrohydrodynamic Stability of Two Superposed Walters B′ Viscoelastic Fluids in Relative Motion Through Porous Medium
Authors: El-Sayed M. F. , Eldabe N. T. , Haroun M. H. , Mostafa D. M. 
Published: May 2013

ABSTRACTA nonlinear stability of two superposed semi-infinite Walters B′ viscoelastic dielectric fluids streaming through porous media in the presence of vertical electric fields in absence of surface charges at their interface is investigated in three dimensions. The method of multiple scales is used to obtain a Ginzburg-Landau equation with complex coefficients describing the behavior of the system. The stability of the system is discussed both analytically and numerically in linear and nonlinear cases, and the corresponding stability conditions are obtained. It is found, in the linear case, that the surface tension and medium permeability have stabilizing effects, and the fluid velocities, electric fields and kinematic viscoelastici-ties have destabilizing effects, while the porosity of porous medium and kinematic viscosities have dual role on the stability. In the nonlinear case, it is found that the fluid velocities, kinematic viscosities, kinematic viscoelasticities, surface tension and porosity of porous medium have stabilizing effects; while the electric fields and medium permeability have destabilizing effects.
Effect of polyphenol-rich grape seed extract on ambulatory blood pressure in subjects with pre- and stage I hypertension
Authors: Ras Rouyanne T. , Zock Peter L. , Zebregs Yvonne E. M. P. , Johnston Neil R. , Webb David J. , Draijer Richard 
Published: May 2013

Dietary polyphenols, such as those from grape products, may exert beneficial effects on cardiovascular health, including anti-hypertensive effects. We investigated the effect of a specific grape seed extract (GSE) rich in low-molecular-weight polyphenolic compounds on ambulatory blood pressure (ABP) in untreated subjects with pre- and stage I hypertension. In addition, potential mechanisms that could underlie the hypothesised effect of GSE on blood pressure (BP), and platelet aggregation, were explored. The study was designed as a double-blind, placebo-controlled, randomised, parallel-group intervention study including seventy healthy subjects with systolic BP between 120 and 159 mmHg. A 1-week run-in period was followed by an 8-week intervention period, during which subjects consumed capsules containing either 300 mg/d of GSE or a placebo (microcrystalline cellulose). Before and after the intervention, daytime ABP readings, 24 h urine samples and fasting and non-fasting blood samples were taken. The mean baseline systolic BP was 135·8 (se 1·3) mmHg and diastolic BP was 81·5 (se 0·9) mmHg. BP values were modestly, but not significantly, affected by the polyphenol-rich GSE treatment v. placebo with an effect of − 3·0 mmHg for systolic BP (95 % CI − 6·5, 0·5) and − 1·4 mmHg for diastolic BP (95 % CI − 3·5, 0·6). Vasoactive markers including endothelin-1, NO metabolites and asymmetric dimethylarginine, plasma renin activity and platelet aggregation were not affected by the GSE intervention. Our findings show that consumption of polyphenol-rich GSE does not significantly lower ABP in untreated subjects with pre- and stage I hypertension.
The Institutional Politics of Territorial Redistribution: Federalism and Equalization Policy in Australia and Canada
Authors: Lecours André , Béland Daniel 
Published: May 2013

Abstract.A key challenge for comparative politics is to explain the varying degrees of political conflict triggered by the territorial redistribution of financial resources. Federal systems pose this question particularly acutely since they typically operate equalization programs that generate different levels and patterns of intergovernmental conflict. For instance, in Canada equalization has generated serious conflict between federal and provincial governments whereas in Australia it has only led to low-level grumblings on the part of some states which have taken shots at others. This article sheds light on the causes for conflict around the territorial redistribution of financial resources by explaining why equalization has produced more severe intergovernmental conflict in Canada than in Australia. It argues that institutional factors linked to the governance structures of equalization and the nature of federalism are at the heart of the cross-national difference. More specifically, the presence of an arms-length agency administrating equalization in Australia compared to executive discretion over the program in Canada and the weaker status and lesser power of states in comparison to Canadian provinces means that equalization policy is more subject to political challenges in Australia than in Canada.Résumé.Une question majeure pour la politique comparée contemporaine, et plus particulièrement le fédéralisme comparé, est celle des conflits politiques et intergouvernementaux générés par la distribution territoriale des ressources fiscales. Au Canada, au cours de la dernière décennie, le programme de péréquation a suscité des conflits importants entre le gouvernement fédéral et les provinces, tandis qu'en Australie la péréquation ne provoque qu'un mécontentement épisodique entre les états fédérés. Cet article cherche à expliquer cette différence. Il suggère que des facteurs institutionnels liés à la gouvernance de la péréquation et à la nature des systèmes fédéraux sont au centre de l'explication. Plus précisément, l'article suggère que la présence d'une agence quasi-indépendante pour administrer la péréquation en Australie et son absence au Canada ainsi que la faiblesse relative des états australiens par rapport aux provinces canadiennes font que la péréquation au Canada est plus sujette aux attaques politiques qu'en Australie.
Shedding Light on Canada's Foreign Policy Alignment
Authors: Paquin Jonathan , Beauregard Philippe 
Published: May 2013

Abstract.The purpose of this article is to explore the issue of alignment in Canadian foreign policy. The main research question is whether Canada's responses to foreign crises aligned with those of its allies, and if so, which allies and why. The study proceeds in two steps. First, it tests four major theoretical perspectives that could explain Canada's behaviour: continentalism, transatlantism, the Anglosphere argument and unilateralism. By performing a computer-generated content analysis, the article assesses these propositions by focusing on and comparing Canada's official declarations to those of the United States, France and Britain to six foreign crises that occurred between 2004 and 2011. Second, the analysis identifies whether there is a difference between the Harper and Martin governments' responses to foreign crises. The research provides quantitative and qualitative evidence suggesting that Canada's foreign policy alignment primarily tends toward a transatlantic orientation. It also shows that the Harper government was less in line with Washington than was the previous Liberal government of Paul Martin, which challenges the conventional wisdom of Canadian foreign policy.Résumé.Cet article explore l'enjeu de l'alignement en politique étrangère canadienne et pose la question de recherche suivante : est-ce qu'à l'égard des crises étrangère le Canada s'aligne sur les positions de ses alliés et, si oui, lesquels et pourquoi? Tout d'abord, l'article présente quatre perspectives théoriques susceptibles d'expliquer le comportement du Canada : le continentalisme, le transatlantisme, la thèse de l'anglosphère et celle de l'unilatéralisme. En ayant recours à une analyse de contenu assistée par ordinateur, cet article teste la validité de ces propositions en comparant les déclarations officielles du Canada à celles des États-Unis, de la France et de l'Angleterre à l'égard de six crises survenues entre 2004 et 2011. Ensuite, l'analyse cherche à identifier s'il y a une différence entre les réponses des gouvernements Harper et Martin à l'égard de ces crises. L'étude fournit des données empiriques de type qualitatif et quantitatif qui suggèrent que le Canada a eu une orientation transatlantique lors de la gestion de ces crises internationales. Elle montre également que le gouvernement Harper est moins aligné sur les positions de Washington que ne le fut le précédent gouvernement libéral, ce qui ébranle certaines idées communément admises en politique étrangère canadienne.
Evaluation of process and input–output-based life-cycle assessment of Irish milk production
Authors: YAN M.-J. , HUMPHREYS J. , HOLDEN N. M. 
Published: May 2013

SUMMARYAgricultural specialists, particularly animal scientists, tend to use process-based life-cycle assessments (LCA), which describe the production system as a series of processes, to study the environmental impact of milk production based on their experimental data. Another approach called input–output (I–O) based LCA, which uses the economic transaction tables and national environmental accounts to determine the environmental impact triggered by final demand of milk production, is often less used due to data scarcity and higher uncertainty. In the current paper, process-based and I–O-based LCA models were developed to evaluate the greenhouse gas (GHG) and acidifying emissions from pasture-based milk production in Ireland. Process-based LCA found 1338·3 kg CO2 eq and 14·4 kg SO2 eq/t energy-corrected milk (ECM), and revealed details related to the farm management. The I–O based LCA found 1003·1 kg CO2 eq and 12·7 kg SO2 eq/tonne ECM and suggested that the agriculture, forestry and fishery (AFF) sector itself was largely responsible for the environmental impact of AFF products, rather than economic interaction with other sectors. The process-based LCA was found to be suitable for developing farm-scale sustainability strategies if variation of tactics across farms is provided, while the I–O based LCA offered potential sustainability guidance at the national scale. Further work is required to incorporate foreign production into the I–O table to account fully for imported goods and services. A detailed disaggregation within the AFF sector is also needed to gain a better understanding of the environmental sustainability of agricultural commodities. The present paper thus provides interesting results for the dairy industry, dairy researchers and LCA practitioners on further understanding of the environmental impact of milk production.
Use of stable isotope ratios to characterize potential shifts in the isotopic niches of grazing insects following an amphibian decline in a Neotropical stream
Authors: Barnum Thomas R. , Verburg Piet , Kilham Susan S. , Whiles Matt R. , Lips Karen R. , Colón-Gaud Checo , Pringle Catherine M. 
Published: May 2013

Abstract:Neotropical streams are losing dominant consumer groups as a result of disease-driven amphibian declines. The herbivorous tadpoles of Lithobates warszewitschii were once abundant in the Rio Maria in the Eastern Cordillera Central of Panama, where they consumed algae and organic matter. The decline of this once abundant grazer has the potential to affect the resources consumed by insect grazers in this system. Stable isotopes were used to characterize changes in the resource use before and after amphibian declines of four abundant insect grazer taxa: Stenonema spp., Thraulodes spp., Psephenus spp. and Petrophila spp. We collected 11 isotope samples of L. warszewitschii and 27 isotope samples of these insect taxa in 2006, and then 24 more isotope samples of the same insect taxa in 2008, 20 mo. after a disease-driven amphibian extirpation. We also tested for potential functional redundancy of insects with tadpoles by comparing the post-decline isotopic niche of each insect taxon to the isotopic niche of L. warszewitschii. The isotopic niche of Psephenus spp., Petrophila spp. and Stenonema spp. shifted from 2006 to 2008, but none of the insect taxa in 2008 occupied the same isotopic niche as tadpoles. Our study builds on previous evidence that the ecological roles of tadpoles were not replaced through functional redundancy after amphibian declines.
Cognitive Reserve and Brain Reserve in Prodromal Huntington's Disease
Authors: Bonner-Jackson Aaron , Long Jeffrey D. , Westervelt Holly , Tremont Geoffrey , Aylward Elizabeth , Paulsen Jane S. ,   The PREDICT-HD Investigators and Coordinators of the Huntington Study Group
Published: May 2013

AbstractHuntington disease (HD) is associated with decline in cognition and progressive morphological changes in brain structures. Cognitive reserve may represent a mechanism by which disease-related decline may be delayed or slowed. The current study examined the relationship between cognitive reserve and longitudinal change in cognitive functioning and brain volumes among prodromal (gene expansion-positive) HD individuals. Participants were genetically confirmed individuals with prodromal HD enrolled in the PREDICT-HD study. Cognitive reserve was computed as the composite of performance on a lexical task estimating premorbid intellectual level, occupational status, and years of education. Linear mixed effects regression (LMER) was used to examine longitudinal changes on four cognitive measures and three brain volumes over approximately 6 years. Higher cognitive reserve was significantly associated with a slower rate of change on one cognitive measure (Trail Making Test, Part B) and slower rate of volume loss in two brain structures (caudate, putamen) for those estimated to be closest to motor disease onset. This relationship was not observed among those estimated to be further from motor disease onset. Our findings demonstrate a relationship between cognitive reserve and both a measure of executive functioning and integrity of certain brain structures in prodromal HD individuals. (JINS, 2013, 19, 1–12).
Energy adjustment of nutrient intakes is preferable to adjustment using body weight and physical activity in epidemiological analyses
Authors: Rhee Jinnie J , Cho Eunyoung , Willett Walter C 
Published: May 2013

AbstractObjectiveAdjustment for body weight and physical activity has been suggested as an alternative to adjusting for reported energy intake in nutritional epidemiology. We examined which of these approaches would yield stronger correlations between nutrients and their biomarkers.DesignA cross-sectional study in which dietary fatty acids, carotenoids and retinol were adjusted for reported energy intake and, separately, for weight and physical activity using the residual method. Correlations between adjusted nutrients and their biomarkers were examined.SettingUSA.SubjectsCases and controls from a nested case–control study of erythrocyte fatty acids and CHD (n442) and of plasma carotenoids and retinol and breast cancer (n1254).ResultsCorrelations between intakes and plasma levels oftrans-fatty acids were 0·30 (energy-adjusted) and 0·16 (weight- and activity-adjusted); for erythrocyte levels, the corresponding correlations were 0·37 and 0·25. Energy-adjusted intakes of linoleic acid and α-linolenic acid were more strongly correlated with their respective biomarkers than weight- and activity-adjusted intakes, but the differences were not significant except for linoleic acid (erythrocyte). Weight- and activity-adjusted DHA intake was slightly more strongly correlated with its plasma biomarker than energy-adjusted intake (0·37v.0·34). Neither method made a difference for DHA (erythrocyte), carotenoids and retinol.ConclusionsThe effect of energy adjustment depends on the nutrient under investigation, and adjustment for energy calculated from the same questionnaire used to estimate nutrient intakes improves the correlation of some nutrients with their biomarkers appreciably. For the nutrients examined, adjustment using weight and physical activity had at most a small effect on these correlations.
Universal Variable Brightfield–Darkfield Contrast: A Variant Technique for Improved Imaging of Problematic Specimens in Light Microscopy
Authors: Piper Timm , Piper Jörg 
Published: May 2013

AbstractSeveral problematic specimens, especially when composed of a complex three-dimensional architecture or very high or ultralow ranges in regional thickness and density, can be observed in improved clarity and precision when universal variable brightfield–darkfield contrast (UVBDC) is used. In this method, two different partial images are optically superimposed and interfere with each other, contributing to complementary visual information: a brightfield and a darkfield image. These images can be generated with concentric-peripheral, paraxial, or axial illuminating light. In all variants, variable transitions between bright- and darkfield are achievable. By use of a pancratic condenser (zoom system), the illuminating light can be universally adjusted and optimally adapted to each type of specimen and each type of objective (glass and mirror lenses). The concentric-peripheral variant is preferably carried out with normal glass lenses, the axial variant with mirror lenses. Glass lenses can also be used for UVBDC based on axial or paraxial light when combined with a special contrast tube, which is described in detail. Which technical variant of UVBDC might lead to the best result may be determined by the particular properties of the specimen, but all techniques described promise significant improvements in image quality and visual information.
An investigation of rotational issues for rectal carcinoma treated with radiotherapy
Authors: Taylor Dominique A. , ffrench Thomas , Sale Charlotte A. , Foulstone Paul 
Published: May 2013

AbstractPurposeTo quantify the amount of inter-fractional pitch for rectal carcinoma patients, to investigate the dosimetric impact of pitch on the target volume and critical structures and to determine a tolerance where no pitch correction is required.Materials and methodsDaily pre-treatment images of rectal carcinoma patients were analysed to determine the residual pitch compared with the computed tomography (CT) planning scan. The dosimetric impact of pelvic rotation was modelled. The dose coverage of the clinical target volume (CTV) and small bowel were evaluated using dose–volume histograms.ResultsPre-treatment images had a mean of 0·27° and standard deviation was 2·23°. The volume of CTV receiving 95% of the prescription dose altered by 0·1% when up to ±10° of pitch was simulated.ConclusionsNo clinically significant change in CTV coverage was found (when ±10° of pitch was simulated). A tolerance of ±10° of pitch has been implemented for rectal carcinoma patients treated with three-dimensional conformal radiotherapy in our institution, when daily pre-treatment imaging with a zero action threshold for translational shifts is used.
Diversity and bioprospecting of fungal communities associated with endemic and cold-adapted macroalgae in Antarctica
Authors: Godinho Valéria M , Furbino Laura E , Santiago Iara F , Pellizzari Franciane M , Yokoya Nair S , Pupo Diclá , Alves Tânia M A , S Junior Policarpo A , Romanha Alvaro J , Zani Carlos L , Cantrell Charles L , Rosa Carlos A , Rosa Luiz H 
Published: May 2013

Abstract
We surveyed the distribution and diversity of fungi associated with eight macroalgae from Antarctica and their capability to produce bioactive compounds. The collections yielded 148 fungal isolates, which were identified using molecular methods as belonging to 21 genera and 50 taxa. The most frequent taxa were Geomyces species (sp.), Penicillium sp. and Metschnikowia australis. Seven fungal isolates associated with the endemic Antarctic macroalgae Monostroma hariotii (Chlorophyte) displayed high internal transcribed spacer sequences similarities with the psychrophilic pathogenic fungus Geomyces destructans. Thirty-three fungal singletons (66%) were identified, representing rare components of the fungal communities. The fungal communities displayed high diversity, richness and dominance indices; however, rarefaction curves indicated that not all of the fungal diversity present was recovered. Penicillium sp. UFMGCB 6034 and Penicillium sp. UFMGCB 6120, recovered from the endemic species Palmaria decipiens (Rhodophyte) and M. hariotii, respectively, yielded extracts with high and selective antifungal and/or trypanocidal activities, in which a preliminary spectral analysis using proton nuclear magnetic resonance spectroscopy indicated the presence of highly functionalised aromatic compounds. These results suggest that the endemic and cold-adapted macroalgae of Antarctica shelter a rich, diversity and complex fungal communities consisting of a few dominant indigenous or mesophilic cold-adapted species, and a large number of rare and/or endemic taxa, which may provide an interesting model of algal–fungal interactions under extreme conditions as well as a potential source of bioactive compounds.