bluuebunny/crossref_metadata_2025_split huggingface dataset:
Employment of Voltammetry in Studies of Transport Processes across Artificial Phospholipid Membranes
Authors: Šestáková Ivana , Navrátil Tomáš , Josypčuk Bohdan 
Published: July 2016

AbstractThis paper reports on voltammetric methods applied in studies of transport processes connected with the occurrence of toxic cadmium in plants. As a means of transport across model of phospholipid membrane (PLM), calcium ionophore (calcimycin), cell‐penetrating peptides (transportan 10 and mastoparan), and finally protoplasts isolated from barley roots and leaves were used. Using calcimycin, different influences of Cd complexation by citric acid or by malic acid as examples of root exudates were documented. For transport of simplest phytochelatin PC2, voltammetric methods using formation of Hg complex on hanging mercury drop electrode (HMDE) or of Ag complex on mercury meniscus covered silver solid amalgam electrode (m‐AgSAE) were assessed.
Analysis of a Two‐Stage Fuel Reactor System for the Chemical‐Looping Combustion of Lignite and Bituminous Coal
Authors: Haus Johannes , Lyu Kai , Hartge Ernst‐Ulrich , Heinrich Stefan , Werther Joachim 
Published: July 2016

AbstractTo investigate the influence of the fuel characteristics on the conversion behavior in a chemical‐looping combustion facility, lignite coal dust (d90,3=233 μm) and two fractions of bituminous coal with different particle sizes (fine fraction d90,3=163 μm, coarse fraction d50,3=707 μm) were used as solid fuel. To improve the conversion performance, a pilot plant with a rated power of 25 kW was constructed with a two‐stage fuel reactor. The influence of the fuel composition, particle size, and the presence/absence of elemental oxygen on the conversion in the fuel reactor are presented. The used oxygen carrier was produced by the impregnation of γ‐alumina oxide with copper oxide, which is able to release gaseous oxygen, but loses this ability because of deactivation. The lignite dust shows a very good conversion performance and carbon capture efficiencies over 95 % as well as oxygen demands below 2 %. Both bituminous coal fractions have a good performance with regard to fuel conversion and oxygen demand but they suffer from a high carbon slip. Hence the carbon capture efficiency is around 60 % for the fine fraction and 40 % for the coarse one. The performance improvement as a result of the second stage was investigated separately, and we proved that it enhances the overall conversion. In addition, the oxygen carrier generated a favorable reaction environment by releasing elemental oxygen in the second stage of the fuel reactor.
Management of the clinically N0 neck in squamous cell carcinoma of the maxillary alveolus and hard palate
Authors: Os Alejandra D. van , Karakullukcu Baris , Leemans C. René , Halmos Gyorgy B. , Roodenburg Jan L. N. , Weert Stijn van , Karagozoglu K. Hakki , Witjes Max J. H. 
Published: July 2016

AbstractBackgroundThe purpose of this study was to evaluate active surveillance strategy in the clinically negative neck in maxillary squamous cell carcinoma (SCC).MethodsOne hundred fourteen consecutive patients diagnosed with oral maxillary SCC were analyzed retrospectively from 3 centers in The Netherlands. Analysis parameters included regional disease‐free survival of N0 patients stratified for T classification, elective radiotherapy (RT) of the neck; and overall survival of the whole cohort, stratified by N classification; salvage neck surgery rates.ResultsWithin the N0 cohort, 26.0% of the patients developed neck metastasis in the follow‐up visits. Regional recurrence was not related to T classification or postoperative RT of the neck. Regional and locoregional recurrence were associated with diminished overall survival (p < .05). Regional metastasis was operable in 22 of 26 cases (85%). Only 1 patient presented with inoperable neck metastasis without local recurrence.ConclusionWatchful waiting was feasible in this cohort. If meticulous follow‐up is not available, elective neck dissection is recommended. © 2016 Wiley Periodicals, Inc. Head Neck 38: 1794–1798, 2016
Synthesis andin vitrosafety assessment of magnetic bacterial cellulose with porcine aortic smooth muscle cells
Authors: Pastrana Homero F. , Cooper Christy L. , Alucozai Milad , Reece Lisa M. , Avila Alba G. , Allain Jean Paul 
Published: July 2016

AbstractBacterial cellulose (BC) has been used as a scaffold for tissue regeneration (TR). Improving functional TR requires highly selective strategies for specific cell attraction. Embedding iron oxide nanoparticles into a BC matrix can drive magnetically labeled cells to specific tissues where they may begin to heal injured tissue. This article focuses on characterization andin vitrotoxicity assessment of magnetic BC (MBC). We proposed to detect the production of radical oxygen species (ROS), esterase activity, and apoptosis to study cytotoxic interactions of MBC within its bioenvironment. Morphological characterization was performed using scanning electron microscopy where evidence shows that the diameter of MBC fibers compared to BC fibers was 33% smaller, and the pore areas were 25% bigger. Cytotoxicity assays in porcine aortic smooth muscle cells exposed for 24 hours to BC, MBC, and poly(ethylene glycol)‐coated MBC (MBC‐PEG) reveals 96% viability and 9% ROS production for MBC‐PEG. In contrast, 25% of cells exposed to MBC were apoptotic, suggesting that even when the cells were metabolically active, MBC can induce damage. These outcomes support the need for more integral assessment in the hopes of assessing the potential biosafety and uses of nanocomposites for TR. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2801–2809, 2016.
Particle size distribution analysis of chemically enhanced two‐phase membrane filtration for olive mill effluents
Authors: Khaligh Sooddeh Salimi , Yagci Nevin , Balcik Cigdem , Ozbey Bahar , Keskinler Bulent , Olmez‐Hanci Tugba , Dizge Nadir , Orhon Derin , Sozen Seval 
Published: July 2016

AbstractBACKGROUNDThis study used particle size distribution (PSD) to reveal how chemical conditioning inflicted changes on different chemical oxygen demand (COD) size fractions to improve the potential of two‐phase membrane separation as an effective preliminary step for the sustainable management of olive processing wastewaters.RESULTSExperiments were designed to explore: (i) the potential of membrane separation as a pretreatment step; and (ii) the way in which chemical conditioning improved the removal potential of membrane treatment. Particle size distribution analysis was conducted to observe changes inflicted on different COD size fractions by chemical conditioning. The chemically enhanced membrane process achieved 95% COD removal, reducing the effluent COD to 6000–8000 mg L−1 range and the total phenol down to 100 mg L−1. Chemical conditioning also removed a significant portion of soluble COD, so that the resulting PSD fingerprint in the effluent was properly reshaped to allow effective removal by membrane treatment.CONCLUSIONThe investigated treatment schemes involving pretreatment of oil wastewater by chemical conditioning together with membrane filtration offered high COD reduction in the effluent and biodegradable permeate when properly diluted for co‐treatment with a compatible wastewater stream. The use of chemical conditioning prior to membrane filtration improved final permeate quality and ultrafiltration membrane flux. © 2016 Society of Chemical Industry
Polyelectrolytes–protein complexes: a viable platform in the downstream processes of industrial enzymes at scaling up level
Authors: Woitovich Valetti Nadia , Brassesco M Emilia , Picó Guillermo Alfredo 
Published: July 2016

AbstractComplexation between proteins and polyelectrolytes through electrostatic interactions gives either soluble or non‐soluble complexes, leading to phase separation. The formation and the stability of these complexes are influenced by pH, ionic strength, ratio between protein and polyelectrolyte and charge density of protein and polyelectrolyte. This review presented the advantages on the protein precipitation by adding a polyelectrolyte solution to a natural enzyme source (microbiological, vegetal or animal homogenate), over the classical precipitation methods. An enzyme can be precipitated like non‐soluble complex, separated and then re‐dissolved, thus the method works, at the same time, like concentrative and pre‐purification steps together. © 2016 Society of Chemical Industry
In vitro antioxidant activity of rice protein affected by alkaline degree and gastrointestinal protease digestion
Authors: Liu Ye , Wang Zhengxuan , Li Hui , Liang Mingcai , Yang Lin 
Published: July 2016

AbstractBACKGROUNDTo elucidate whether and how alkali treatment, which is a common process for rice protein (RP) extraction, affects antioxidant activity of RP, the different degree of alkali (from 0.1% to 0.4% of NaOH) was used to extract RP (RP‐1, RP‐2, RP‐3, RP‐4).RESULTSThe antioxidant capacities of scavenging free radicals [2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonic acid] diammonium salt, ABTS; 1,1‐diphenyl‐2‐picrylhydrazyl, DPPH), chelating metals (iron, copper) and reducing power investigated in the hydrolysates of RPs (RP‐1, RP‐2, RP‐3, RP‐4) during in vitro pepsin–pancreatin digestion were effectively affected by alkali treatment. The present study demonstrated that the weakest antioxidant responses to ABTS radical‐scavenging activity, DPPH radical‐scavenging activity, iron chelating activity, copper chelating activity and reducing power were produced by RP‐4 extracted by the highest alkali proportion (0.4% NaOH).CONCULSIONThe present study indicates that antioxidant capacity of RP could be more readily depressed by strict alkali degree and affected by gastrointestinal proteases. Results suggest that alkali extraction is a vital process to regulate the antioxidant activity of RP through modifying the compositions of amino acids, which are dependent on alkali magnitude. © 2016 Society of Chemical Industry
Black disk visibility, turbidity, and total suspended solids in rivers: A comparative evaluation
Authors: West Amie O. , Scott J. Thad 
Published: July 2016

AbstractThis study compared horizontal black disk visibility (BDV), a measure of visual water clarity, to turbidity and total suspended solids (TSS) concentrations in five rivers of the southwestern Ozarks of Arkansas, U.S. to assess its usefulness in evaluating optical water quality. We investigated correlative relationships between BDV vs. turbidity and BDV vs. TSS, and compared them to those reported in similar studies. Our results indicated that replicate measures of horizontal BDV were subject to less error than replicate turbidity (coefficients of variation were 5.0% and 6.4%, respectively), and BDV was more strongly correlated with TSS concentrations than was turbidity (correlations coefficients were −0.97 and 0.92, respectively). We also assessed the validity of the black disk method as a surrogate for TSS concentrations and derived a predictive model for each river in the study. The benefits of the horizontal black disk method are both scientific and practical. Horizontal BDV provides a means of quantifying the beam attenuation coefficient. And, the low cost, ease of use, and usefulness in shallow rivers make the black disk method a versatile tool in water quality assessment. We ultimately conclude that the horizontal black disk method should be added to routine monitoring programs in the U.S., and that it be adopted by public groups involved in volunteer monitoring and water quality communication that may be limited by equipment availability or budget.
Synthesis of Polyester Dendritic Scaffolds for Biomedical Applications
Authors: Sadowski Lukas P. , Edem Patricia E. , Valliant John F. , Adronov Alex 
Published: July 2016

Using a well‐defined poly(2,2‐bis(hydroxymethyl)propanoic acid) dendrimer scaffold, a series of G1 to G3 dendrons is functionalized at the periphery with alkynes to enable “Click” functionalization via the copper‐catalyzed alkyne–azide cycloaddition (CuAAC). The resulting dendrons are further functionalized at the core with a dipicolylamine (DPA) moiety to enable radiolabeling with 99mTc for molecular imaging applications. Efficient CuAAC coupling is achieved using an azide‐functionalized triethylene glycol monomethyl ether (TEG‐N3). Removal of copper from the DPA ligand is successfully performed on G1 and G2 dendrimers prior to radiolabeling with 99mTc. Radiolabeling of the G3 dendrimer is accomplished via transmetallation of the [CuDPA]2+ ligand with 99mTc, further demonstrating the feasibility of the synthetic strategies in the preparation of dendritic imaging agents. Subsequent attachment of an acyloxymethyl ketone (AOMK) derivative for targeting of cathepsin B is also explored. Despite demonstrating the ability to ligate multiple AOMK ligands, the AOMK–dendrimer conjugates are not able to bind to cathepsin B, which may be attributed to steric hindrance at the dendrimer periphery.
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FlowVisor‐based cost‐aware VN embedding in OpenFlow networks
Authors: Zhong Xuxia , Wang Ying , Qiu Xuesong , Li Wenjing 
Published: July 2016

SummarySoftware‐defined network has emerged as a promising network technology to simplify the network management and enable innovation through network programmability. With the help of FlowVisor, network virtualization is achieved in software‐defined networks. We mainly focus on investigating how to embed virtual network requests with different network sizes (small, regular, and large) in a cost‐efficient way. However, the features of FlowVisor and limitations of OpenFlow switches, such as the presence of a central controller, the limited flow space resource, and the out‐of‐band bandwidth requirement, bring new challenges. In this paper, we first formulate the FlowVisor‐enabled cost‐aware virtual network embedding issue as an integer linear programming problem. Then, we propose two embedding algorithms: a heuristic algorithm LF‐OVNE and a meta‐heuristic algorithm CA‐CVNC‐EPSO. Meanwhile, a separate step is taken to select a cost‐aware controller for each slice. Finally, we evaluate our algorithms and compare the embedding performance with the existing algorithms. The simulation results show that our algorithms perform the online virtual network embedding in a more cost‐efficient way. Copyright © 2016 John Wiley & Sons, Ltd.
Posterior urethral valves and vesicoureteral reflux: can prenatal ultrasonography distinguish between these two conditions in male fetuses?
Authors: Chitrit Yvon , Bourdon Mathilde , Korb Diane , Grapin‐Dagorno Christine , Joinau‐Zoulovits Félicia , Vuillard Edith , Paye‐Jaouen Annabel , Peycelon Matthieu , Belarbi Nadia , Delezoide Anne‐Lyse , Schmitz Thomas , El Ghoneimi Alaa , Sibony Olivier , Oury Jean‐François 
Published: July 2016

AbstractObjectiveThe objective of the study was to evaluate prenatal sonographic signs that distinguish male fetuses with posterior urethral valves (PUV) from those with vesicoureteral reflux (VUR).MethodsPrenatal data were retrospectively retrieved from all consecutive women delivering between 2003 and 2012 of a male newborn with a postnatal diagnosis of PUV or VUR. Prenatal parameters included fetal bladder characteristics, identification of a dilated posterior urethra, and change in shape and size in the fetal renal pelvis or ureter.ResultsOne hundred thirty‐six women gave birth to a male newborn with a postnatal diagnosis of PUV (n = 49) or VUR (n = 87). The presence of posterior urethral dilatation [21 (42.9%) fetuses versus 0 (0%), p = 0.000], a thickened fetal bladder wall [37 (75.5%) vs 4 (4.6%), p = 0.000], and anhydramnios [14 (28.6%) vs 0, p = 0.000] were strongly associated with the postnatal diagnosis of PUV. Change in shape and size in the fetal renal pelvis or ureter was observed in 15 (17.2%) of 87 children with VUR versus 1 (2.0%) out of 49 with PUV (p = 0.010).ConclusionsPrenatal ultrasound may differentiate with reasonable accuracy male fetuses with a postnatal diagnosis of PUV from those with VUR. © 2016 John Wiley & Sons, Ltd.
Chemistry of polydopamine analogues
Authors: Mrówczyński Radosław , Markiewicz Roksana , Liebscher Jürgen 
Published: July 2016

AbstractPolydopamine analogues (PDANAs) extend the prospering field of polydopamine (PDA) considerably. They include additional functional groups providing altered properties interesting for various applications. PDANAs can be obtained by post functionalization of PDA, by oxidative polymerization of dopamine derivatives or by copolymerization of dopamine with dopamine derivatives, other monomers or reactive polymers. This review covers the state of the art and gives insight into the huge potential of the field to be explored in the future. © 2016 Society of Chemical Industry
Interplay of 4f and 3d moments in EuFe2As2 iron pnictides
Authors: Maiwald Jannis , Gegenwart Philipp 
Published: July 2016

AbstractEuFeAs is unique among 122 iron pnictides due to its 4f magnetic moments. We review its properties with particular emphasis on the interplay between 4f and 3d moments. After discussing the parent compound, we first focus on the evolution of magnetism and superconductivity for hole‐doped EuKFeAs as well as for chemical and hydrostatic pressure in EuFe(AsP) . Non‐Fermi liquid behavior for optimally doped superconducting systems is highlighted in the electrical resistivity and thermoelectric power. We also discuss the in‐plane anisotropy and how the indirect magnetoelastic coupling between Eu 4f moments and the crystal structure can be used for persistent detwinning of EuFeAs in the orthorhombic state by small magnetic fields.
An assessment of automatic speaker verification vulnerabilities to replay spoofing attacks
Authors: Janicki Artur , Alegre Federico , Evans Nicholas 
Published: July 2016

AbstractThis paper analyses the threat of replay spoofing or presentation attacks in the context of automatic speaker verification. As relatively high‐technology attacks, speech synthesis and voice conversion, which have thus far received far greater attention in the literature, are probably beyond the means of the average fraudster. The implementation of replay attacks, in contrast, requires no specific expertise nor sophisticated equipment. Replay attacks are thus likely to be the most prolific in practice, while their impact is relatively under‐researched. The work presented here aims to compare at a high level the threat of replay attacks with those of speech synthesis and voice conversion. The comparison is performed using strictly controlled protocols and with six different automatic speaker verification systems including a state‐of‐the‐art iVector/probabilistic linear discriminant analysis system. Experiments show that low‐effort replay attacks present at least a comparable threat to speech synthesis and voice conversion. The paper also describes and assesses two replay attack countermeasures. A relatively new approach based on the local binary pattern analysis of speech spectrograms is shown to outperform a competing approach based on the detection of far‐field recordings. Copyright © 2016 John Wiley & Sons, Ltd.
Anions of π‐Acidic N‐nitrosulfonyl/carboxy Amides and Their Re Complexes
Authors: Bohle D. Scott , Chua Zhijie 
Published: July 2016

AbstractThe synthesis of the potassium salts of the nitrogen acids N‐nitroamide {N‐nitroacetamide, K[CH3C(O)NNO2] (1)}, N‐nitrosulfonamide {N‐nitro‐p‐tolylsulfonamide, K[p‐tolylSO2NNO2] (2)} and N‐nitrocarbamates {N‐nitromethylcarbamate, K[CH3OC(O)NNO2] (3), N‐nitroethylcarbamate, K[C2H5OC(O)NNO2] (4)} are described. Reaction of 1–4 with [Re(CH3CN)2(CO)2(PPh3)2](X) (X=ClO4 or BF4) gave the corresponding new Re(I) nitrogen acid complexes Re(η2‐nitrogen acid)(CO)2(PPh3)2 5–8 in good yields. Complex 5 and 6 can also be obtained from the reaction of N‐nitroacetamide (1‐H) or N‐nitro‐p‐tolylsulfonamide (2‐H) respectively with the basic Re(I) hydride complex, Re(H)(CO)2(PPh3)3.
A New CuII Coordination Polymer: Structural Elucidation, EPR and Sensing Studies for Detection of Volatile Organic Solvents
Authors: Das Kuheli , Mendiratta Shruti , Datta Amitabha , Gajewska Małgorzata J. , Garribba Eugenio , Akitsu Takashiro , Sinha Chittaranjan 
Published: July 2016

AbstractThe copper derivative [Cu(H‐stp)(bipy)(H2O)2]n⋅H2O (1) is afforded by combining flexible 2‐sulfoterephthalic acid monosodium salt [Na(H2stp)] and divalent copper nitrate in presence of the N‐donor ancillary co‐ligand, 4,4′‐bipyridyl. As a result of the potential coordination modes of carboxylate oxygens from the stp ligand and the bipy co‐ligand, a one dimensional chain is formed as evident by single‐crystal X‐ray diffraction technique. Solvent exchange studies reveals that compound 1 is able to sense various small polar volatile organic compounds (VOCs) and acts as a good capacitative sensor under ambient conditions. An increase of the temperature from 100 to 298 K on EPR measurement causes a variation of the SOMO composition and a change of the spectrum from an ’inverse’ to a ‘rhombic’ one. On temperature dependent magnetic study, the χMT value of compound 1 is 6.86 cm3 K mol‐1 at 5 K which decreases up to 8.81 cm3 K mol‐1 at 300 K.
Ahab: A cloud‐based distributed big data analytics framework for the Internet of Things
Authors: Vögler Michael , Schleicher Johannes M. , Inzinger Christian , Dustdar Schahram 
Published: July 2016

SummarySmart city applications generate large amounts of operational data during their execution, such as information from infrastructure monitoring, performance and health events from used toolsets, and application execution logs. These data streams contain vital information about the execution environment that can be used to fine‐tune or optimize different layers of a smart city application infrastructure. Current approaches do not sufficiently address the efficient collection, processing, and storage of this information in the smart city domain. In this paper, we present Ahab, a generic, scalable, and fault‐tolerant data processing framework based on the cloud that allows operators to perform online and offline analyses on gathered data to better understand and optimize the behavior of the available smart city infrastructure. Ahab is designed for easy integration of new data sources, provides an extensible API to perform custom analysis tasks, and a domain‐specific language to define adaptation rules based on analysis results. We demonstrate the feasibility of the proposed approach using an example application for autonomous intersection management in smart city environments. Our framework is able to autonomously optimize application deployment topologies by distributing processing load over available infrastructure resources when necessary based on both online analysis of the current state of the environment and patterns learned from historical data. Copyright © 2016 John Wiley & Sons, Ltd.