bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the synthesis and bonding properties of reactive hot‐melt polyurethane adhesive
Authors: Tang Qiheng , He Jiyu , Yang Rongjie , Ai Qingsong 
Published: August 2012

AbstractReactive hot‐melt polyurethane adhesive (RHMPA) is moisture‐curing polyurethane (PU) adhesive whose main component is an isocyanate‐terminated PU prepolymer that can be cured after application by reaction with ambient moisture. Two series of RHMP‐containing poly(tetramethylene glycol) (PTMG) of different molecular weights and different degrees of polymerization of the hard segment have been successfully synthesized using a two‐step bulk polymerization with 4,4′‐diphenylmethane diisocyanate, PTMG, and 1,4‐butanediol (1,4‐BDO). The structure and basic properties of the RHMPA film have also been characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis, atomic force microscopy, gel permeation chromatography (GPC), shore hardness (A/D), and tensile tests. The results show that the initial decomposition temperature is more than 250°C, and the tensile strength of the RHMPA film was greater than 15 MPa. The adhesive performance of the RHMPA with different hard‐segment content was studied through studies of the single lap‐shear strength and tensile strength of butt joints. The results show a general trend of the bonding strength increases with the hard‐segment content at 25°C. The adhesive performance of RHMPA in different environments was also investigated. It was found that the RHMPA exhibited excellent bonding strength to thermoplastic polyurethane elastomer (TPU) when placed in the fridge at −20°C, hot water at 80°C, 1 M HCl solution (acid) at 25°C, and 1 M NaOH solution (alkaline) at 25°C for 10 h. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Effect of cross‐linker on morphology, catalytic activity, and recyclability of immobilized palladium chloride
Authors: Jia Yong‐Guang , Jiang Jian , Liu Ling‐Yan , Chang Wei‐Xing , Li Jing 
Published: August 2012

AbstractTwo kinds of immobilized palladium (Pd) catalysts were prepared by reversible addition fragmentation chain transfer polymerization of pyridine‐containing monomer followed by immobilizing palladium chloride (PdCl2) on block copolymers. Namely, one of them includes the cross‐linking structure of maleic anhydride with 1,6‐diaminohexane (cross‐linker), polystyrene‐block‐poly(4‐(4‐vinylbenzyloxy)butylpicolinate‐alt‐maleic anhydride)‐Pd (PS‐b‐P(VBP‐alt‐MAn)‐Pd), and the other is its non‐cross‐linking counterpart, polystyrene‐block‐poly(4‐(4‐vinylbenzyloxy) butylpicolinate)‐Pd (PS‐b‐PVBP‐Pd). From transmission electron microscopy images, it could be observed that they both assembled into micelles in the selective solvents. The Pd of PS‐b‐P(VBP‐alt‐MAn)‐Pd located in the core of micelles, whereas the Pd of PS‐b‐PVBP‐Pd was on the shell of the micelles. The PS‐b‐P(VBP‐alt‐MAn)‐Pd can be continuously used for five times without any appreciable loss of activity in the aqueous Suzuki‐coupling reaction. However, the catalytic activities of the PS‐b‐PVBP‐Pd decreased sharply with the increase in the recycle times. Thus, this promising cross‐linking strategy not only greatly restrained the loss of Pd in the catalytic cycles, but also effectively maintained the immobilized Pd catalyst's high activity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Robust Saturated PI Joint Velocity Control for Robot Manipulators
Authors: Moreno–Valenzuela J. , Santibáñez V. 
Published: August 2012

AbstractIt is well known that many industrial manipulators use an embedded linear proportional‐integral (PI) joint velocity controller to guarantee motion control through proper velocity commands. However, although this control scheme has been very successful in practice, not much attention has been paid to designing new PI velocity control structures. The problem of analyzing a saturated PI velocity joint velocity controller is addressed in this paper. By using the theory of singularly perturbed systems, the closed‐loop system is studied. The robot dynamics assumed in this paper take into account bounded time–varying disturbances which may include the friction at the joints. An experimental study in a planar two degrees‐of‐freedom direct‐drive robot is also presented, confirming the advantage of the new saturated PI joint velocity controller.
Chitosan‐heparin polyelectrolyte multilayers on cortical bone: Periosteum‐mimetic, cytophilic, antibacterial coatings
Authors: Almodóvar Jorge , Mower Justin , Banerjee Apurba , Sarkar Ajoy K. , Ehrhart Nicole P. , Kipper Matt J. 
Published: August 2012

AbstractCortical bone allografts suffer from high rates of failure due to poor integration with host tissue, leading to non‐union, fracture, and infection following secondary procedures. Here, we report a method for modifying the surfaces of cortical bone with coatings that have biological functions that may help overcome these challenges. These chitosan‐heparin coatings promote mesenchymal stem cell attachment and have significant antibacterial activity against both S. aureus and E. coli. Furthermore, their chemistry is similar to coatings we have reported on previously, which effectively stabilize and deliver heparin‐binding growth factors. These coatings have potential as synthetic periosteum for improving bone allograft outcomes. Biotechnol. Bioeng. 2013; 110: 609–618. © 2012 Wiley Periodicals, Inc.
Encapsulated fusion protein confers “sense and respond” activity to chitosan–alginate capsules to manipulate bacterial quorum sensing
Authors: Gupta Apoorv , Terrell Jessica L. , Fernandes Rohan , Dowling Matthew B. , Payne Gregory F. , Raghavan Srinivasa R. , Bentley William E. 
Published: August 2012

AbstractWe demonstrate that “nanofactory”‐loaded biopolymer capsules placed in the midst of a bacterial population can direct bacterial communication. Quorum sensing (QS) is a process by which bacteria communicate through small‐molecules, such as autoinducer‐2 (AI‐2), leading to collective behaviors such as virulence and biofilm formation. In our approach, a “nanofactory” construct is created, which comprises an antibody complexed with a fusion protein that produces AI‐2. These nanofactories are entrapped within capsules formed by electrostatic complexation of cationic (chitosan) and anionic (sodium alginate) biopolymers. The chitosan capsule shell is crosslinked by tripolyphosphate (TPP) to confer structural integrity. The capsule shell is impermeable to the encapsulated nanofactories, but freely permeable to small molecules. In turn, the capsules are able to take in substrates from the external medium via diffusion, and convert these via the nanofactories into AI‐2, which then diffuses out. The exported AI‐2 is shown to stimulate QS responses in vicinal Escherichia coli. Directing bacterial population behavior has potential applications in next‐generation antimicrobial therapy and pathogen detection. We also envision such capsules to be akin to artificial “cells” that can participate in native biological signaling and communicate in real‐time with the human microbiome. Through such interaction capabilities, these “cells” may sense the health of the microbiome, and direct its function in a desired, host‐friendly manner. Biotechnol. Bioeng. 2013; 110: 552–562. © 2012 Wiley Periodicals, Inc.
Selective high throughput protein quantification based on UV absorption spectra
Authors: Hansen Sigrid K. , Jamali Babak , Hubbuch Jürgen 
Published: August 2012

AbstractThe application of high throughput experimentation (HTE) in protein purification process development has created an analytical bottleneck. Recently, a new label‐free and non‐invasive methodology for analyzing multicomponent protein mixtures by means of spectral measurements was presented. Analytics based on the methodology was shown to increase analytical throughput for selective protein quantification significantly, however this was only demonstrated for one particular protein combination. In this work, the possibilities and limitations of the analytical method are investigated further. Principal component analysis (PCA) was performed on a broad range of absorption spectra to investigate their common characteristics and differences. The PCA was used both for cluster analysis and to define a measure for spectral similarity. For binary protein combinations, the calibration precision was shown to decrease exponentially with the defined spectral similarity factor. Knowledge of this correlation can be used to determine a priori whether a calibration will be successful or not. Calibration robustness was investigated by applying the analytics to liquid chromatography performed in HTE mode. Further it was shown, that a spectral difference of 0.6% was sufficient to sucessfully preform a spectral based calibration of two IgG1 monoclonals. Biotechnol. Bioeng. 2013; 110: 448–460. © 2012 Wiley Periodicals, Inc.
Secondary Metabolites of Plants from the Genus Cipadessa: Chemistry and Biological Activity
Authors: Bandi Anil Kumar Reddy , Lee Dong‐Ung 
Published: August 2012

AbstractThe plants of genus Cipadessa, which are distributed across India and southwest of China, have been used as natural insecticides, as well as folk medicines for the treatment of a range of maladies such as diabetes, dysentery, malaria, piles, snake poison, rheumatism, etc. This article reviews the chemical constituents that have been isolated from Cipadessa species to date, including their biological activities. The compounds listed are tetranortriterpenoids (limonoids), diterpenoids, sesquiterpenoids, flavonoids, steroids, and some others.
Leishmanicidal and Anticandidal Activity of Constituents of Indian Edible Mushroom Astraeus hygrometricus
Authors: Lai Tapan K. , Biswas Gunjan , Chatterjee Soumya , Dutta Aritri , Pal Chiranjib , Banerji Julie , Bhuvanesh Nattamai , Reibenspies Joseph H. , Acharya Krishnendu 
Published: August 2012

AbstractTwo new lanostane‐type triterpenes, 1 and 2, were isolated from Astraeus hygrometricus. The structures were established by IR, 1H‐ and 13C‐NMR, MS, and X‐ray crystallographic experiments. The triterpenes exhibited excellent in vitro toxicities against Candida albicans, comparable to standard antifungal antibiotics. The triterpene 2 significantly inhibited the growth of Leishmania donovani promastigotes in vitro. The triterpene skeleton may be considered a template structure in search for new compounds with anticandidal and leishmanicidal activity.
Biotransformation of (−)‐(R)‐α‐Phellandrene: Antimicrobial Activity of Its Major Metabolite
Authors: İşcan Gökalp , Kırımer Neşe , Demirci Fatih , Demirci Betül , Noma Yoshiaki , Başer K. Hüsnü Can 
Published: August 2012

AbstractTerpene derivatives converted by microbial biotransformation constitute an important resource for natural pharmaceutical, fragrance, and aroma substances. In the present study, the monoterpene α‐phellandrene was biotransformed by 16 different strains of microorganisms (bacteria, fungi, and yeasts). The transformation metabolites were initially screened by TLC and GC/MS, and then further characterized by NMR spectroscopic techniques. Among the six metabolites characterized, 6‐hydroxypiperitone, α‐phellandrene epoxide, cis‐p‐menth‐2‐en‐1‐ol, and carvotanacetone, which originated from (−)‐(R)‐α‐phellandrene, are reported for the first time in this study. Additionally, the substrate and the metabolite 5‐p‐menthene‐1,2‐diol were subjected to in vitro antibacterial and anticandidal tests. The metabolite showed moderate‐to‐good inhibitory activities (MICs=0.125 to >4 mg/ml) against various bacteria and especially against Candida species in comparison with its substrate (−)‐(R)‐α‐phellandrene and standard antimicrobial agents.
Chemical Constituents of Plant from the Genus Craniotome
Authors: Joshi Rajesh K. 
Published: August 2012

AbstractCraniotome furcata (Link) O. Kuntze (Lamiaceae) has been reported worldwide as the only species of the genus Craniotome. Traditionally, this plant is used in the treatment of wounds. Craniosides A and B, buddlejasaponins I, and essential oils have been isolated from the genus Craniotome.
New Antiplasmodial Bromotyrosine Derivatives from Suberea ianthelliformisLendenfeld, 1888
Authors: Mani Luke , Jullian Valerie , Mourkazel Beatrice , Valentin Alexis , Dubois Joëlle , Cresteil Thierry , Folcher Eric , Hooper John N. A. , Erpenbeck Dirk , Aalbersberg William , Debitus Cécile 
Published: August 2012

AbstractFour samples of Suberea ianthelliformis were investigated and furnished five new and 13 known brominated tyrosine‐derived compounds. Two of the new compounds were identified as araplysillin N20‐formamide and its N‐oxide derivative. Three other new compounds, araplysillins IV, V, and VI, were isolated and identified as analogs of araplysillin II. Most of these compounds exhibit moderate inhibitory activities against chloroquine‐resistant and ‐sensitive strains of Plasmodium falciparum, and were investigated for their PFTase inhibitory properties. The chemical content of the investigated sponges is correlated with their molecular phylogeny.
Antioxidation and DNA‐Binding Properties of Binuclear Lanthanide(III) Complexes with a Schiff Base Ligand Derived from 8‐Hydroxyquinoline‐7‐carboxaldehyde and Benzoylhydrazine
Authors: Liu Yongchun , Zhang Kejun , Wu Yun , Zhao Junying , Liu Jianning 
Published: August 2012

Abstract8‐Hydroxyquinoline‐7‐carboxaldehyde (8‐HQ‐7‐CA), Schiff‐base ligand 8‐hydroxyquinoline‐7‐carboxaldehyde benzoylhydrazone, and binuclear complexes [LnL(NO3)(H2O)2]2 were prepared from the ligand and equivalent molar amounts of Ln(NO3)⋅6 H2O (Ln=La3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Ho3+, Er3+, Yb3+, resp.). Ligand acts as dibasic tetradentates, binding to LnIII through the phenolate O‐atom, N‐atom of quinolinato unit, and CN and OCN groups of the benzoylhydrazine side chain. Dimerization of this monomeric unit occurs through the phenolate O‐atoms leading to a central four‐membered (LnO)2 ring. Ligand and all of the LnIII complexes can strongly bind to CT‐DNA through intercalation with the binding constants at 105–106 M−1. Moreover, ligand and all of the LnIII complexes have strong abilities of scavenging effects for hydroxyl (HO.) radicals. Both the antioxidation and DNA‐binding properties of LnIII complexes are much better than that of ligand.
Bare‐metal stent versus drug‐eluting stent in large coronary arteries
Authors: Geng Deng‐Feng , Meng Zhe , Yan Hai‐Yan , Nie Ru‐Qiong , Deng Jing , Wang Jing‐Feng 
Published: August 2012

BackgroundUncertainties exist with regard to the efficacy of drug‐eluting stent (DES) versus bare‐metal stent (BMS) in large coronary arteries.Objective and MethodsThe aim of this study was to investigate the efficacy of BMS versus DES in terms of clinical events in large coronary vessels (≥3.0 mm) by performing a meta‐analysis of all relevant randomized controlled trials (RCTs).ResultsSix RCTs with 4,399 patients were included in this study. Overall, there were no significant between‐group differences in the risks of the composite of cardiac death and nonfatal myocardial infarction (cardiac death/MI), cardiac death, myocardial infarction, and stent thrombosis, however, DES was associated with significant reduction in the risk of target vessel revascularization (TVR) compared with BMS [0.48 (0.33, 0.70)] with consistent benefits among patients with reference vessel diameter ≥ 3.5 mm, reference vessel diameter ≥ 4.0 mm, stent length ≤ 15 mm, first‐generation DES or second‐generation DES. In patients with ≥ 3‐year follow‐up, there were no significant between‐group differences in the risk of cardiac death/MI, TVR, cardiac death, myocardial infarction or stent thrombosis.ConclusionsThis meta‐analysis suggests that DES is superior to BMS in terms of adverse cardiac events in large coronary arteries at the mid‐term follow‐up. The long‐term efficacy of newer‐generation DES versus BMS in larger coronary arteries is still worth further evaluation. © 2012 Wiley Periodicals, Inc.
Reductions in cod and acute toxicity of wastewater generated from refined cotton production using activated carbon fibre (ACF)
Authors: Zhao Xu , Zhao Quanlin , Meng Qingqiang , Xia Wei , Ye Zhengfang 
Published: August 2012

AbstractActivated carbon fibre is investigated for adsorption of organic pollutants from wastewater generated from refined cotton production. UV–Vis spectroscopy and FTIR are used to evaluate the chemical changes. Results indicate that the main organic components of refined cotton production wastewater are guaiacyl (G‐) and hydroxyphenyl (H‐) lignin. It is found that 85% of COD can be removed at 40°C with ACF dosage of 90 g L−1. The adsorption process is described by the Redlich–Peterson isotherm model. The kinetic data follows a pseudo‐second‐order equation. Over 99% of acute toxicity for Refined Cotton Production (RCP) wastewater has been reduced after adsorption using ACF. © 2012 Canadian Society for Chemical Engineering
An analysis of user behavior in a private BitTorrent community
Authors: Cai Qing‐Chao , Lo Kowk‐Tung 
Published: August 2012

SUMMARYThis paper aims to develop an understanding on how users of private BitTorrent communities participate in downloading and uploading by using the download records of CHDBits, one of the largest private BitTorrent communities in China. First, we investigate the arrivals of CHDBits users, which correspond to the initiations of new download tasks. The investigation demonstrates that user arrival rate varies with time in a day, and this variation dovetails well into users’ daily schedule. Moreover, we observe that it is with more than half possibility that the two consecutive arrivals of a CHDBits user take place in the same day, and that an individual user issues new download tasks with a probability of 0.23, on which we base to estimate that all CHDBits users are expected to launch at least one new download task in 42 days. Second, we present an analysis on the post‐download behavior of users. We observe that the average per task seeding time of 99% of users is no less than 8 h, showing CHDBits users’ great willingness to contribute. We also find that almost all the seeding processes have been interrupted and resumed multiple times. Finally, we study the bandwidth distribution of users and evaluate users’ bandwidth utilization in the downloading process. Our study shows that the bandwidths of most CHDBits users are uniformly distributed in the range from 256 kB/s to 16 MB/s, and users with a higher bandwidth tend to experience a lower bandwidth utilization. Copyright © 2012 John Wiley & Sons, Ltd.
Cognitive radio CDMA networking with spectrum sensing
Authors: Roy Sanjay Dhar , Kundu Sumit , Ferrari Gianluigi , Raheli Riccardo 
Published: August 2012

SUMMARYIn this paper, the performance of cognitive radio (CR) code division multiple access (CDMA) systems is analyzed. More precisely, CR users belong to a cognitive radio network (CRN), which coexists with a primary radio network (PRN). Both CRN and PRN are CDMA‐based, with colocated base stations. Soft hand off and power control are considered in both the CRN and the PRN. Upon the development of an accurate simulator for a representative three‐cell cellular scenario, we evaluate the performance of the proposed CR system in terms of outage probability, blocking probability and average data rate of secondary users. Three different spectrum sensing techniques are. Two new schemes, based on interference limit, are proposed and compared with an existing adaptive spectrum sensing scheme. Spectrum activity measurements and spectrum sharing decisions have been considered for evaluating the performance of the three schemes. The paper proposes a new CR‐CDMA networking model and a simulation testbed for evaluating performances of secondary users and primary users in terms of outage, blocking, BER and average data rate in the presence of soft hand‐off and power control. For comparison purposes, the analysis in the absence of spectrum sensing is also investigated.Copyright © 2012 John Wiley & Sons, Ltd.
Cooperative communications for LTE‐advanced—relay and CoMP
Authors: Nam Young‐Han , Liu Lingjia , Zhang Jianzhong (Charlie) 
Published: August 2012

SUMMARYThe Long Term Evolution‐Advanced (LTE‐A) system is currently under development to allow for significantly higher spectral efficiency and data throughput than the LTE systems. In a wireless system based on orthogonal frequency division multiplexing with frequency reuse factor one, the achievable cell spectral efficiency is often limited by the inter‐cell interference or coverage shortage of base stations. In LTE‐A, coordinated multi‐point transmission/reception (a.k.a. multi‐cell MIMO or base station cooperation) and relaying technologies are being introduced to clear these major performance hurdles. In this paper, cooperative communication technologies being discussed in LTE‐A systems are presented, together with considerations on system design. Copyright © 2012 John Wiley & Sons, Ltd.
An Air‐Stable Fe3S4 Complex with Properties Similar to Those of the HOXair State of the Diiron Hydrogenases
Authors: Huang Yong , Gao Weiming , Åkermark Torbjörn , Li Mingrun , Åkermark Björn 
Published: August 2012

AbstractA Fe3S4 complex bridged by azapropanedithiolate (adt), complex 6, was prepared as a potential model of the HOXair state of [FeFe]‐hydrogenases. Complex 6 was characterized by IR and 1H NMR spectroscopy, and its structure was determined by X‐ray crystallography. The electrochemical studies show that complex 6 is redox‐active under acidic conditions, which provides insight into the catalytic mechanism. Hydrogen evolution, driven by visible light, was observed in CH3CN/D2O solution by online mass spectroscopy.
Structural Characterization of Amidinatobismuth(III) Diazides
Authors: Lyhs Benjamin , Bläser Dieter , Wölper Christoph , Haack Rebekka , Jansen Georg , Schulz Stephan 
Published: August 2012

AbstractAmidinatobismuth(III) diazides LBi(N3)2 {L1 = [tBuC(NiPr)2] (2), L2 = [tBuC(NDipp)2] (3, Dipp = 2,6‐iPr2‐C6H3)} were synthesized in high yields by metathesis reactions of the corresponding halide‐substituted complexes L1BiI2 (1) and L2BiCl2 with AgN3. Compounds 1–3 were characterized by using elemental analyses, multinuclear NMR (1H, 13C), and IR spectroscopy as well as by using single‐crystal X‐ray diffraction (for 2, 3).
Pseudo dynamic test of a deficient reinforced concrete frame upgraded with internal steel frames
Authors: Ozcelik Ramazan , Binici Baris , Kurc Ozgur 
Published: August 2012

ABSTRACTTwo‐story, three‐bay reinforced concrete (RC) frames with and without internal steel frame (ISF) retrofits were tested using continuous pseudo dynamic test method. The ISFs were installed to the middle bay of the RC frame. Test results indicated that ISF retrofit was beneficial in resisting deformation demands without significant damage under simulated ground motions. The ISF shifted the failure mode of the system from a brittle to a ductile mode. The test results were compared with the results of the nonlinear time history analysis. The analysis results were capable of tracing the overall behavior of global response parameters; however, estimations of local demand parameters were less accurate. Copyright © 2012 John Wiley & Sons, Ltd.