bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic, Mechanistic, and Thermodynamic Modeling of Zn(II) Ion Biosorption onto Zinc Sequestering Bacterium VMSDCM
Authors: Mishra Vishal , Balomajumder Chandrajit , Agarwal Vijay K. 
Published: March 2013

AbstractThe surface of the bacterial cells before the biosorption of Zn(II) ion has been found rough, heterogeneous, and non‐crystalline together with tremendous protrusions and negatively charged functional groups. The bacterium was characterized as rod shaped with Gram‐negative type of cell wall structure. In reaction dynamics, pseudo‐second‐order kinetics with higher linear correlation coefficient (R2) ranging between 0.97 and 0.99, lower sum of square errors (SSE) (0.035–0.081) and chi (χ2) (0.0013–0.009) provided a better explanation of sorption of Zn(II) ion on bacterium surface as compared to pseudo‐first‐order model. The removal of Zn(II) was governed by both film and intra‐particle diffusion at onset and later stage of sorption of metal ion on the surface of bacterial cells. The R2 (0.92–0.94) for intra‐particle diffusion model was quite higher with lower values of SSE (9.56–16.33) and chi (χ2) (11.26–19.65) against the Bangham's model. The positive value of ΔH (16.628 × 10−6 kJ/mol) and ΔS (5320.90 kJ/mol/K) showed that the biosorption of Zn(II) ion across liquid phase on bacterial surface was endothermic with increased randomness at solid–liquid interface. The negative values of ΔG demarcated the whole process as spontaneous in nature. In the present work, the distribution coefficient was found to be > 0.5 at various temperature ranges. At the attainment of equilibrium, the residual concentration of Zn(II) ion in liquid phase was around 0.6 mg/L, which was much below the limit described by United States Environmental Protection Agency (USEPA), i.e. 5 mg/L.
Synthesis and Structure–Activity Relationship Studies of Derivatives of the Dual Aromatase–Sulfatase Inhibitor 4‐{[(4‐Cyanophenyl)(4H‐1,2,4‐triazol‐4‐yl)amino]methyl}phenyl sulfamate
Authors: Woo L. W. Lawrence , Wood Paul M. , Bubert Christian , Thomas Mark P. , Purohit Atul , Potter Barry V. L. 
Published: March 2013

Abstract4‐{[(4‐Cyanophenyl)(4H‐1,2,4‐triazol‐4‐yl)amino]methyl}phenyl sulfamate and its ortho‐halogenated (F, Cl, Br) derivatives are first‐generation dual aromatase and sulfatase inhibitors (DASIs). Structure–activity relationship studies were performed on these compounds, and various modifications were made to their structures involving relocation of the halogen atom, introduction of more halogen atoms, replacement of the halogen with another group, replacement of the methylene linker with a difluoromethylene linker, replacement of the para‐cyanophenyl ring with other ring structures, and replacement of the triazolyl group with an imidazolyl group. The most potent in vitro DASI discovered is an imidazole derivative with IC50 values against aromatase and steroid sulfatase in a JEG‐3 cell preparation of 0.2 and 2.5 nM, respectively. The parent phenol of this compound inhibits aromatase with an IC50 value of 0.028 nM in the same assay.
Real‐time simulation of biological soft tissues: a PGD approach
Authors: Niroomandi S. , González D. , Alfaro I. , Bordeu F. , Leygue A. , Cueto E. , Chinesta F. 
Published: March 2013

SUMMARYWe introduce here a novel approach for the numerical simulation of nonlinear, hyperelastic soft tissues at kilohertz feedback rates necessary for haptic rendering. This approach is based upon the use of proper generalized decomposition techniques, a generalization of PODs. Proper generalized decomposition techniques can be considered as a means of a priori model order reduction and provides a physics‐based meta‐model without the need for prior computer experiments. The suggested strategy is thus composed of an offline phase, in which a general meta‐model is computed, and an online evaluation phase in which the results are obtained at real time. Results are provided that show the potential of the proposed technique, together with some benchmark test that shows the accuracy of the method. Copyright © 2013 John Wiley & Sons, Ltd.
Context‐awareness in the deregulated electric energy market: an agent‐based approach
Authors: Capodieci Nicola , Alsina Emanuel Federico , Cabri Giacomo 
Published: March 2013

SummaryMultiagent systems are commonly used for simulation of new paradigms of energy distribution. Especially when considering Smart Grids, the autonomicity deployed by goal‐driven agents implies the need for being aware of multiple aspects connected to the energy distribution context. With ‘context’, we refer to the outside world variables such as weather, stock market trends, location of the users, government actions, and so on; therefore, an architecture highly context‐aware is needed. We propose a model in which every important factor concerning the electric energy distribution is presented by modeling context‐aware agents able to identify the impact of these factors. Moreover, some tests have been performed regarding the web service integration in which agents contracting energy will automatically retrieve data to be used in adaptive and collaborative aspects; an explicative example is represented by the retrieval of weather forecasting that provides input on ongoing demand and data for the predicted availability (in case of photovoltaic or wind powered environments). Copyright © 2013 John Wiley & Sons, Ltd.
Similitude between the NGD function and filter gain behaviours
Authors: Ravelo Blaise 
Published: March 2013

ABSTRACTThis paper deals with the similitude between the behaviours of linear filter gain and negative group delay (NGD) function. The transposition method of low‐pass/high‐pass, low‐pass/band‐pass and low‐pass/band‐stop NGD circuits is established. To the best of the author knowledge, it acts as the first paper devoted on the NGD function generalized theory. The introduced transform relationships simplify the synthesis of any NGD circuits from simple elementary low‐pass NGD topologies. Families of innovative NGD topologies are identified. To verify the relevance of the concept proposed, frequency‐ and time‐domain analysis results from realistic proofs of concept demonstrating the feasibility of developed NGD transforms were performed. Thanks to the NGD phenomenon, the possibility of the ultra‐wideband pulse signals propagating in time‐advance is verified. Finally, potential applications of NGD circuits are discussed. Copyright © 2013 John Wiley & Sons, Ltd.
Extensible optical access network enabling multistage protections and data aggregation based on tangent rings
Authors: Shao Qi , Gan Chaoqin , Wang Ruixue 
Published: March 2013

ABSTRACTIn this paper, an extensible optical access network architecture is proposed on the basis of multiple tangent single‐fiber rings. With the proposed architecture, both multistage protections and data aggregation can be realized. Optical line terminal and remote nodes (RNs) can automatically switch to protection mode to overcome fiber failure occurring in both main ring (MR) and sub‐rings (SRs). The RNs, which are designed as tangent points, can realize wavelengths adding and dropping between MR and SRs, and they also can realize the network expansion conveniently and smoothly through adding more wavelengths. So, it is a good selection for next‐generation large‐scale access networks. Copyright © 2013 John Wiley & Sons, Ltd.
Sex‐biases in distribution and resource use at different spatial scales in a migratory shorebird
Authors: Alves José A. , Gunnarsson Tómas G. , Potts Peter M. , Sutherland William J. , Gill Jennifer A. 
Published: March 2013

AbstractIn migratory species, sexual size dimorphism can mean differing energetic requirements for males and females. Differences in the costs of migration and in the environmental conditions occurring throughout the range may therefore result in sex‐biases in distribution and resource use at different spatial scales. In order to identify the scale at which sexual segregation operates, and thus the scale at which environmental changes may have sex‐biased impacts, we use range‐wide tracking of individually color‐ringed Icelandic black‐tailed godwits (Limosa limosa islandica) to quantify sexual segregation at scales ranging from the occupation of sites throughout the non‐breeding range to within‐site differences in distribution and resource use.Throughout the range of this migratory shorebird, there is no evidence of large‐scale sex differences in distribution during the non‐breeding season. However, the sexes differ in their selection of prey types and sizes, which results in small‐scale sexual segregation within estuaries. The scale of sexual segregation therefore depends on the scale of variation in resource distribution, which, in this system, is primarily within estuaries. Sexual segregation in within‐site distribution and resource use means that local‐scale anthropogenic impacts on estuarine benthic prey communities may disproportionately affect the sexes in these migratory shorebirds.
Ecological immunology in a fluctuating environment: an integrative analysis of tree swallow nestling immune defense
Authors: Pigeon Gabriel , Bélisle Marc , Garant Dany , Cohen Alan A. , Pelletier Fanie 
Published: March 2013

AbstractEvolutionary ecologists have long been interested by the link between different immune defenses and fitness. Given the importance of a proper immune defense for survival, it is important to understand how its numerous components are affected by environmental heterogeneity. Previous studies targeting this question have rarely considered more than two immune markers. In this study, we measured seven immune markers (response to phytohemagglutinin (PHA), hemolysis capacity, hemagglutination capacity, plasma bactericidal capacity, percentage of lymphocytes, percentage of heterophils, and percentage of eosinophils) in tree swallow (Tachycineta bicolor) nestlings raised in two types of agro‐ecosystems of contrasted quality and over 2 years. First, we assessed the effect of environmental heterogeneity (spatial and temporal) on the strength and direction of correlations between immune measures. Second, we investigated the effect of an immune score integrating information from several immune markers on individual performance (including growth, mass at fledging and parasite burden). Both a multivariate and a pair‐wise approach showed variation in relationships between immune measures across years and habitats. We also found a weak association between the integrated score of nestling immune function and individual performance, but only under certain environmental conditions. We conclude that the ecological context can strongly affect the interpretation of immune defenses in the wild. Given that spatiotemporal variations are likely to affect individual immune defenses, great caution should be used when generalizing conclusions to other study systems.
High‐Throughput Sequencing: A Roadmap Toward Community Ecology
Authors: Poisot Timothée , Péquin Bérangère , Gravel Dominique 
Published: March 2013

AbstractHigh‐throughput sequencing is becoming increasingly important in microbial ecology, yet it is surprisingly under‐used to generate or test biogeographic hypotheses. In this contribution, we highlight how adding these methods to the ecologist toolbox will allow the detection of new patterns, and will help our understanding of the structure and dynamics of diversity. Starting with a review of ecological questions that can be addressed, we move on to the technical and analytical issues that will benefit from an increased collaboration between different disciplines.
Simultaneous Determination of Nickel and Cobalt Using a Solid Bismuth Vibrating Electrode by Adsorptive Cathodic Stripping Voltammetry
Authors: Alves Georgina M. S. , Magalhães Júlia M. C. S. , Soares Helena M. V. M. 
Published: March 2013

AbstractA simple, fast, sensitive and greener voltammetric procedure for simultaneous analysis of nickel (Ni) and cobalt (Co) by square wave adsorptive cathodic stripping voltammetry (SW‐AdCSV) using a solid bismuth vibrating electrode is presented for the first time. The procedure enables to determine Ni together with Co, in ammonia buffer 0.1 M (pH 9.2) and in the presence of oxygen, and involves an adsorptive accumulation of metal‐dimethylglyoxime (Ni‐DMG and Co‐DMG) complexes on the electrode surface. For Ni and Co, the detection limits, obtained with 30 s of accumulation time, were 0.6 and 1.0 µg L−1, respectively. The method was free of metals (Cd2+, Cr3+, Cr6+, Cu2+, Fe3+ and Pb2+ up to 50 µg L−1, Al3+ and Mn2+ up to 500 µg L−1; Zn2+ up to 300 µg L−1) interferences up to the concentrations mentioned in brackets. The proposed method was validated for simultaneous determination of Ni and Co in a certified reference surface and river waters with good results.
Prediction of Equilibrium Conditions for Hydrate Formation in Binary Gaseous Systems Using Artificial Neural Networks
Authors: Moradi M. R. , Nazari K. , Alavi S. , Mohaddesi M. 
Published: March 2013

AbstractThe present work attempts to indicate the potential of artificial neural networks (ANN) for the fast and reliable estimation of the equilibrium conditions of single, binary, and multiple hydrocarbon gas hydrates. The ANN used in this study was a network with the tangent‐sigmoid (tansig) propagation transfer function in the hidden layer and a final layer with the linear (purelin) transfer function. The number of hidden neurons has been determined by minimizing the error of the calculation. The obtained results and the ANN model reliability were compared with other predictive methods. Results showed that the ANN method is able to reliably predict the hydrate equilibrium conditions of hydrocarbons, particularly for binary gas systems, using simple input parameters such as the weight fractions and normal boiling points of the components.
Dynamic analysis of flexible rectangular fluid containers subjected to horizontal ground motion
Authors: Hashemi S. , Saadatpour M. M. , Kianoush M. R. 
Published: March 2013

SUMMARYIn this paper, an analytical method is proposed to determine the dynamic response of 3‐D rectangular liquid storage tanks with four flexible walls, subjected to horizontal seismic ground motion. Fluid–structure interaction effects on the dynamic responses of partially filled fluid containers, incorporating wall flexibility, are accounted for in evaluating impulsive pressure. The velocity potential in which boundary conditions are satisfied is solved by the method of separation of variables using the principle of superposition. The impulsive pressure distribution is then computed. Solutions based on 3‐D modeling of the rectangular containers are obtained by applying the Rayleigh–Ritz method using the vibration modes of flexible plates with suitable boundary conditions. Trigonometrical functions that satisfy boundary conditions of the storage tank such that the flexibility of the wall is thoroughly considered are used to define the admissible vibration modes. The analysis is then performed in the time domain. Moreover, an analytical procedure is developed for deriving a simple formula that evaluates convective pressure and surface displacements in a similar rigid tank. The variation of dynamic response characteristics with respect to different tank parameters is investigated. A mechanical model, which takes into account the deformability of the tank wall, is developed. The parameters of such a model can be obtained from developed charts, and the maximum seismic loading can be predicted by means of a response spectrum characterizing the design earthquake. Accordingly, a simplified but sufficiently accurate design procedure is developed to improve code formulas for the seismic design of liquid storage tanks. Copyright © 2013 John Wiley & Sons, Ltd.
Are Adolescent Treatment Studies of Eating Disorders Utilizing Clinically Relevant Samples? A Comparison of RCT and Clinic Treatment‐Seeking Youth with Eating Disorders
Authors: Stiles‐Shields Colleen , Goldschmidt Andrea B. , Lock James , Le Grange Daniel 
Published: March 2013

AbstractObjectiveTo assess potential selection bias in participant recruitment for randomized controlled trials (RCTs) of adolescent eating disorders (EDs), we compared participants recruited for RCTs evaluating psychosocial treatments with individuals seeking fee‐for‐service outpatient ED treatment [clinic treatment‐seeking (CTS)].MethodParticipants were 214 adolescents presenting to an outpatient ED research‐clinical program (92.1% female; M age = 15.4 ± 1.8 years). ANOVA and chi‐square tests assessed differences between CTS participants and those presenting for no‐cost treatment through RCTs. A secondary analysis compared RCT participants to participants eligible for the RCTs that opted for fee‐for‐service treatment.ResultsRCT participants had greater baseline ED and general psychopathology (p < .001); however, CTS participants were more likely to present with a comorbid psychiatric disorder (p < .05) and higher family income (p < .05).DiscussionResults suggest that RCT participants did not have less pathology than CTS participants. While preliminary, results do not indicate a systematic population bias in selecting healthier patients for RCTs involving adolescent ED. Copyright © 2013 John Wiley & Sons, Ltd and Eating Disorders Association.
Early Eocene to middle Miocene cooling and aridification of East Antarctica
Authors: Passchier S. , Bohaty S. M. , Jiménez‐Espejo F. , Pross J. , Röhl U. , van de Flierdt T. , Escutia C. , Brinkhuis H. 
Published: March 2013

AbstractFew high‐latitude terrestrial records document the timing and nature of the Cenozoic “Greenhouse” to “Icehouse” transition. Here we exploit the bulk geochemistry of marine siliciclastic sediments from drill cores on Antarctica's continental margin to extract a unique semiquantitative temperature and precipitation record for Eocene to mid‐Miocene (~54–13 Ma). Alkaline elements are strongly enriched in the detrital mineral fraction in fine‐grained siliciclastic marine sediments and only occur as trace metals in the biogenic fraction. Hence, terrestrial climofunctions similar to the chemical index of alteration (CIA) can be applied to the alkaline major element geochemistry of marine sediments on continental margins in order to reconstruct changes in precipitation and temperature. We validate this approach by comparison with published paleotemperature and precipitation records derived from fossil wood, leaves, and pollen and find remarkable agreement, despite uncertainties in the calibrations of the different proxies. A long‐term cooling on the order of ≥8°C is observed between the Early Eocene Climatic Optimum (~54–52 Ma) and the middle Miocene (~15–13 Ma) with the onset of transient cooling episodes in the middle Eocene at ~46–45 Ma. High‐latitude stratigraphic records currently exhibit insufficient temporal resolution to reconstruct continental aridity and inferred ice‐sheet development during the middle to late Eocene (~45–37 Ma). However, we find an abrupt aridification of East Antarctica near the Eocene‐Oligocene transition (~34 Ma), which suggests that ice coverage influenced high‐latitude atmospheric circulation patterns through albedo effects from the earliest Oligocene onward.
Obliquity and long eccentricity pacing of the Middle Miocene climate transition
Authors: Tian Jun , Yang Mei , Lyle Mitchell W. , Wilkens Roy , Shackford Julia K. 
Published: March 2013

AbstractThe Middle Miocene East Antarctic ice sheet expansion (EAIE), which is indicated by an abrupt ~1‰ increase in global benthic foraminiferal δ18O at ~13.8 Ma, marks the Middle Miocene climate transition (MMCT) and has been related to astronomically modulated changes in the global carbon cycle. Here, we present high resolution (3–4 kyr) benthic foraminiferal δ18O and δ13C records from IODP Site U1337 in the central equatorial Pacific, which spans the period 12.2–15.8 Ma. The isotopic records clearly demonstrate significant imprints from periodic variations in the Earth's orbital parameters, particularly the obliquity (40 kyr) and the long eccentricity (400 kyr) cycles. While the benthic δ18O and δ13C exhibit nearly identical amplitudes for glacial‐interglacial cycles from 15.8 to 12.2 Ma, the long‐term trends in the benthic δ18O and δ13C had started to reverse after the beginning of the EAIE. Within the 400‐kyr band, the benthic −δ18O and δ13C displays a constant phase relationship between 15.8 and 12.2 Ma. At the 41‐kyr band, however, a phase reversal reaching >180° between −δ18O and δ13C occurs from 13.8 Ma to 14.0 Ma during the period of the EAIE. A similar phase relationship of benthic foraminiferal −δ18O and δ13C at the 400‐kyr band and the 41‐kyr band is also observed at ODP Site 1146 from the northern South China Sea. This phase jump occurs when the long‐term trends in δ18O and δ13C split, suggesting a decoupling of the global ice volume and ocean carbon reservoir changes during the Middle Miocene.
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid‐ocean ridge?
Authors: Schlindwein Vera , Demuth Andrea , Geissler Wolfram H. , Jokat Wilfried 
Published: March 2013

AbstractUltraslow spreading mid‐ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of the ultraslow spreading Knipovich Ridge in the Norwegian‐Greenland Sea with ocean bottom seismometers, we discovered a seismic gap in the upper mantle beneath Logachev Seamount, where micro‐earthquakes clearly delineate a shallowing of the maximum depth of faulting. A topography of the lithosphere that allows melts to travel laterally along its base and rise in areas of thin lithosphere has been proposed as a possible mechanism to explain the focusing of melts at volcanic centers, but has never been confirmed observationally. Our results are the first geophysical evidence for an along‐axis variation of the lithospheric thickness at an ultraslow spreading ridge.
Interaction of dense shelf water cascading and open‐sea convection in the northwestern Mediterranean during winter 2012
Authors: Durrieu de Madron X. , Houpert L. , Puig P. , Sanchez‐Vidal A. , Testor P. , Bosse A. , Estournel C. , Somot S. , Bourrin F. , Bouin M. N. , Beauverger M. , Beguery L. , Calafat A. , Canals M. , Cassou C. , Coppola L. , Dausse D. , D'Ortenzio F. , Font J. , Heussner S. , Kunesch S. , Lefevre D. , Le Goff H. , Martín J. , Mortier L. , Palanques A. , Raimbault P. 
Published: March 2013

AbstractThe winter of 2012 experienced peculiar atmospheric conditions that triggered a massive formation of dense water on the continental shelf and in the deep basin of the Gulf of Lions. Multiplatforms observations enabled a synoptic view of dense water formation and spreading at basin scale. Five months after its formation, the dense water of coastal origin created a distinct bottom layer up to a few hundreds of meters thick over the central part of the NW Mediterranean basin, which was overlaid by a layer of newly formed deep water produced by open‐sea convection. These new observations highlight the role of intense episodes of both dense shelf water cascading and open‐sea convection to the progressive modification of the NW Mediterranean deep waters.