bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Efficient One‐Pot Synthesis of 1,2,3‐Triazole‐Fused Chromenes/Quinolines via Oxidative [3+2] Cycloaddition followed by Reductive Cyclization
Authors: Gangaprasad D. , Raj J. Paul , Karthikeyan K. , Rengasamy R. , Elangovan J. 
Published: September 2018

AbstractA convenient and efficient one‐pot synthesis of 1,2,3‐triazole‐fused chromenes/ quinolines is developed. The methodology is based on oxidative azide‐olefin [3+2] cycloaddition followed by intramolecular reductive cyclization. This methodology affords fast and simple access to 1,2,3‐triazole‐fused heterocycles in good to excellent yields without necessitating chromatographic purification.magnified image
Bifunctional Iron Complexes Catalyzed Alkylation of Indoles
Authors: Seck Charlotte , Mbaye Mbaye Diagne , Gaillard Sylvain , Renaud Jean‐Luc 
Published: September 2018

AbstractCyclopentadienone iron carbonyl complexes have been applied in alkylation of indoles with various benzylic alcohols, aliphatic alcohols (butanol, ethanol, methanol and 2‐methylpentanol) via the hydrogen autotransfer strategy in mild reaction conditions. Experimental works highlight the role of the bifunctional iron complexes and the base. These iron complexes demonstrated a broad applicability in mild conditions and extended the scope of substrates in iron catalyzed C−C bond formation.magnified image
Diversiform Reactivity of Naphthols in Asymmetric Dearomatization or O‐Alkylation Reactions with Aziridines
Authors: Wang Linqing , Yang Dongxu , Li Dan , Zhu Haiyong , Wang Pengxin , Liu Xihong , Bai Lutao , Wang Rui 
Published: September 2018

AbstractHere, we present a catalytic asymmetric and site‐selective reaction of naphthols, realizing diversiform reactions in asymmetric dearomatization or O‐alkylation with aziridines, and the reason for the switchable reactivity is formally analyzed with different type of substrates under different conditions.magnified image
Enantioselective Allenylation of Aldehydes via Brønsted Acid Catalysis
Authors: Wang Mengzhou , Khan Shahriar , Miliordos Evangelos , Chen Ming 
Published: September 2018

AbstractAn enantioselective allenylation of aldehydes catalyzed by a chiral, nonracemic phosphoric acid was reported. Under the developed conditions, 1,1′‐disubstituted allenic alcohols were obtained in 64–98% yields with 88–99% ee. Computational studies were conducted to probe the origin of asymmetric induction. Mechanistic studies suggest that the pinacol moiety of the propargylboronate is critical to the enantioselectivity of the reaction that was supported by experimental data.magnified image
Neighborhood Characteristics, Maternal Parenting, and Health and Development of Children from Socioeconomically Disadvantaged Families
Authors: Choi Jeong‐Kyun , Kelley Megan S. , Wang Dan 
Published: September 2018

AbstractThe present study examined the direct and indirect effects of neighborhood conditions on the health and development of children from socioeconomically disadvantaged families. Two waves of data were analyzed from the Fragile Families and Child Wellbeing study and its subsample of 3,656 mothers and their young children at ages 3 and 5. The results show that social cohesion was directly and indirectly associated with children's behavioral problems and health status. Social control was found to have an indirect effect on children's behavioral problems and cognitive development transmitted through maternal parenting quality and parenting stress. There were significant direct effects of neighborhood physical disorder on children's behavioral problems and cognitive development. In terms of effect size, mothers’ parenting stress and parenting quality, economic hardship, education level, and health care coverage were also prominent factors in determining the health and development of children. Implications for interventions and future research are discussed.
Relative abundance of nasal microbiota in chronic rhinosinusitis by structured histopathology
Authors: Kuhar Hannah N. , Tajudeen Bobby A. , Mahdavinia Mahboobeh , Heilingoetter Ashley , Ganti Ashwin , Gattuso Paolo , Ghai Ritu , Batra Pete S. 
Published: September 2018

BackgroundChronic rhinosinusitis (CRS) is an inflammatory disease process with several different phenotypes. Recent data has shown that CRS phenotypes maintain distinct nasal microbiota that may predict surgical outcomes. Nasal microbiota and structured histopathologic reporting have the potential to further differentiate subtypes and provide additional insight into the pathophysiology of CRS.MethodsSinus swabs collected during functional endoscopic sinus surgery (FESS) were studied by polymerase chain reaction analysis of 16S ribosomal RNA. A structured histopathology report of 13 variables was utilized to analyze sinus tissue removed during FESS. Histopathology variables and relative abundance of nasal microbiota were compared among CRS patients.ResultsA total of 51 CRS patients who underwent FESS were included. Relative abundance of the Firmicutes phylum in nasal microbiota of CRS patients was associated with presence of neutrophilic infiltrate (27.47 ± 44.75 vs 9.21 ± 11.84, p < 0.029), presence of mucosal ulceration (47.67 ± 45.52 vs 13.27 ± 26.48, p < 0.041), presence of squamous metaplasia (5562.70 ± 2715.66 vs 3563.73 ± 2580.84, p < 0.035), and absence of Charcot‐Leyden crystals (5423.00 ± 3320.57 vs 679.94 ± 1653.66, p < 0.001). Relative abundance of the Bacteroidetes phylum in nasal microbiota of CRS patients was associated with increased severity of inflammatory degree (p < 0.004) and presence of mucosal ulceration (p < 0.004).ConclusionDistinct histopathologic features of CRS are associated with relative abundance of nasal microbiota phyla, specifically Firmicutes and Bacteroidetes. These findings contribute to the growing body of literature on microbiota in sinonasal disease and may have important implications for understanding pathophysiologic mechanisms of CRS subtypes and disease management.
Carbon Nanotubes with Cobalt Corroles for Hydrogen and Oxygen Evolution in pH 0–14 Solutions
Authors: Li Xialiang , Lei Haitao , Liu Jieyu , Zhao Xueli , Ding Shuping , Zhang Zongyao , Tao Xixi , Zhang Wei , Wang Weichao , Zheng Xiaohong , Cao Rui 
Published: September 2018

AbstractWater splitting is promising to realize a hydrogen‐based society. The practical use of molecular water‐splitting catalysts relies on their integration onto electrode materials. We describe herein the immobilization of cobalt corroles on carbon nanotubes (CNTs) by four strategies and compare the performance of the resulting hybrids for H2 and O2 evolution. Co corroles can be covalently attached to CNTs with short conjugated linkers (the hybrid is denoted as H1) or with long alkane chains (H2), or can be grafted to CNTs via strong π–π interactions (H3) or via simple adsorption (H4). An activity trend H1≫H3>H2≈H4 is obtained for H2 and O2 evolution, showing the critical role of electron transfer ability on electrocatalysis. Notably, H1 is the first Janus catalyst for both H2 and O2 evolution reactions in pH 0–14 aqueous solutions. Therefore, this work is significant to show potential uses of electrode materials with well‐designed molecular catalysts in electrocatalysis.
A Metal–Organic Framework with Suitable Pore Size and Specific Functional Sites for the Removal of Trace Propyne from Propylene
Authors: Li Libo , Wen Hui‐Min , He Chaohui , Lin Rui‐Biao , Krishna Rajamani , Wu Hui , Zhou Wei , Li Jinping , Li Bin , Chen Banglin 
Published: September 2018

AbstractSeparation of propyne/propylene (C3H4/C3H6) is more difficult and challenging than that of acetylene/ethylene (C2H2/C2H4) because of their closer molecular sizes. A comprehensive screening of a series of metal–organic frameworks with broad types of structures, pore sizes, and functionalities was carried out. UTSA‐200 was identified as the best separating material for the removal of trace C3H4 from C3H4/C3H6 mixtures. Gas sorption isotherms reveal that UTSA‐200 exhibits by far the highest C3H4 adsorption capacity (95 cm3 cm−3 at 0.01 bar and 298 K) and record C3H4/C3H6 selectivity, which was mainly attributed to the suitable dynamic pore size to efficiently block the larger C3H6 molecule whilst the strong binding sites and pore flexibility capture smaller C3H4. This material thus provides record purification capacity for the removal of C3H4 from a 1:99 (or 0.1:99.9, v/v) C3H4/C3H6 mixture to produce 99.9999 % pure C3H6 with a productivity of 62.0 (or 142.8) mmol g−1.
A novel chemical–biochemical process technology for full exploitation of chicken fat for animal nutrition
Authors: Sohrabi Dariush , Jazini Mohammadhadi , Tohidi Mohammad , Shariati Mansour 
Published: September 2018

AbstractChicken fat, a source of unsaturated fatty acid, is obtained from cooked poultry by‐products. A fat molecule consists of a glycerol and three fatty acids. This work aimed to introduce a novel chemical–biochemical process technology for full exploitation of chicken fat building blocks, that is, conversion of fatty acids to fatty acid calcium salts (FACSs) and utilization of glycerol for cultivation of microalgae (Dunaliella salina). FACSs are fed to cows as rumen‐protected fat. Response surface methodology was used for optimization of calcium salt production in pilot scale reactor. A pilot‐scale helical photobioreactor was used for cultivation of D. salina. The results pointed out that from each 1,000 g of chicken fat, approximately 840 g of FACS and approximately 39 g of D. salina powder can be obtained. The proposed process technology is a potentially economic alternative for current commercial FACS production processes where glycerol in their waste is not exploited.
Experimental analysis and prediction of viscoelastic creep properties of PP/EVA/LDH nanocomposites using master curves based on time–temperature superposition
Authors: Mahdavi Reza , Goodarzi Vahabodin , Ali Khonakdar Hossein , Hassan Jafari Seyed , Reza Saeb Mohammad , Shojaei Shahrokh 
Published: September 2018

ABSTRACTPrediction of viscoelastic behavior of polymers over a long‐term period is of vital importance for engineering applications. An attempt was made to uncover the interplay between the morphology and viscoelastic behavior of compatibilized polypropylene/ethylene vinyl acetate (EVA) copolymer blends in the presence of layered double hydroxide (LDH) nanoplatelets. The time–temperature superposition (TTS) principle and WLF equations were merged to obtain master curves of storage modulus at defined reference temperatures enabling prediction of storage modulus at high frequency ranges which are not experimentally measureable. Moreover, the creep compliance master curves were acquired for different reference temperatures to predict the creep compliance of nanocomposites over long period of times. It was found that the presence of LDH decreases the creep compliance at long period of times while it decreases the unrecoverable deformation of EVA domains. A simple mechanism was proposed to explain the creep and recovery behavior of samples blend at different temperatures. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46725.
Theophylline‐loaded pectin‐based hydrogels. I. Effect of medium pH and preparation conditions on drug release profile
Authors: Güner Ozde Zeynep , Cam Cansu , Arabacioglu‐Kocaaga Banu , Batirel Saime , Güner F. Seniha 
Published: September 2018

ABSTRACTIn this study, a series of theophylline‐loaded calcium pectin gel films were prepared in three different Ca+2 concentrations with three different methods for wound dressing applications. Drug release performance of the films were investigated in four different medium pH in order to mimic wound healing pH conditions. Hydrogel films were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy and atomic force microscopy. Their absorbency (fluid handling), swelling behavior, dehydration rate, dispersion characteristic, dressing pH determination, water vapor permeability, oxygen permeability, surface contact angle, flexibility, Shore A hardness, mean mass per unit area and thickness were determined. The effect of the hydrogels on wound healing was evaluated with an in vitro wound healing assay. After evaluating all data, we suggested that the hydrogel film prepared with swelling method using 7% or 10% crosslinker and dried at 26 °C is more suitable for controlled drug release process. We showed that between pH 3.25 and 7.12 the form of the hydrogel did not change, and drug release was continuous. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46731.
Soundproofing flexible polyurethane foams: The impact of polyester chemical structure on the microphase separation and acoustic damping
Authors: Abdollahi Baghban Sahar , Khorasani Manouchehr , Sadeghi Gity Mir Mohamad 
Published: September 2018

ABSTRACTHigh‐performance acoustic‐damping flexible polyurethane foams (FPUFs) were fabricated using synthesized linear saturated aliphatic polyesters, methylene diphenyl diisocyanate, and other reagents by one‐shot bulk polymerization (isocyanate index = 110 and water content = 5%). In this study, the effect of the chemical structure of different LSAPs on microphase separation and acoustic dampening behavior of FPUFs was investigated using atomic force microscopy, Fourier transform infrared spectroscopy, compressive strength, optical microscopy, and an impedance tube device. The results revealed that by increasing the microphase separation, sound absorption efficiency increased up to 45%. Also, by increasing microphase separation, compressive strength, open‐cell contents, roughness, and cell size distribution of FPUFs increased, and the average cell size decreased. Sound wave energy dissipation of FPUFs can be explained by the synergistic actions of the microphase separation including the viscoelastic behavior of segments and increasing of drainage flow pathway. Finally, the results revealed that soundproofing FPUFs under optimum conditions for microphase separation and drainage flow can be promising candidates for use as sound‐insulating materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2018,135, 46744.
Effect of argon plasma treatment on hydrophilic stability of nanofiber webs
Authors: Yalcinkaya Fatma 
Published: September 2018

ABSTRACTThis paper provides a comprehensive analysis of microwave‐induced low‐vacuum argon plasma treatment effects on the hydrophilic stability of various polymeric nanofiber webs. After plasma modification, samples are kept dry at room temperature in a dark place for the experiments, and the wettability of the nanofibers is improved by plasma treatment. The stability of the plasma‐treated hydrophilic nanofiber webs is observed for 55 days using water contact angle measurements. Different polymeric nanofiber webs show different stability. Based on the contact angle measurements, the surface starts to lose hydrophilicity during the first week after plasma treatment. The structural changes are examined by pore size measurements, scanning electron microscopy, and Fourier transform infrared spectroscopy. Two of the selected nanofiber webs are used as microfilters for separation of oily wastewater with a cross‐flow separation unit to measure the effect of the plasma treatment under wastewater. The permeability and selectivity of the plasma‐treated and untreated samples are compared. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46751.
The effects of PCL diol molecular weight on properties of shape memory poly(ε‐caprolactone) networks
Authors: Tian G. , Zhu G. , Ren T. , Liu Y. , Wei K. , Liu Y. X. 
Published: September 2018

ABSTRACTShape memory poly(ε‐caprolactone) (PCL) networks with different molecular weights of PCL diol were prepared via thiol–ene reaction in this work. The highly efficient thiol–ene reaction ensured a uniform distribution of PCL chains between crosslinker, contributing well‐defined network architecture with good mechanical and shape memory properties. 1H NMR spectra were used to confirm that PCL diol was completely converted into acrylate‐terminated PCL. Gel content experiment and Fourier‐transform infrared showed that almost all samples exhibited virtually the complete crosslinking network due to the highly selective thiol–ene reaction between acrylate‐terminated PCL and tetrathiol crosslinker. Differential scanning calorimetry and X‐ray diffraction tests revealed that the melting temperature and crystallinity of the prepared PCL networks by using high molecular weight of PCL diol displayed a higher result compared to ones using low molecular weight. The dynamic mechanical analyzer results revealed that the storage modulus of the network dropped evidently across the thermal transition, these characteristics of the PCL network indicated that all exhibited a good shape memory effect. The shape fixing ability was kind of being affected by the PCL diol molecular weight, while the shape recovery ratio of all samples can almost reach 99% irrespective of the length of PCL diol. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47055.
Development of poly(lactic acid) films with propolis as a source of active compounds: Biodegradability, physical, and functional properties
Authors: Ulloa P. A. , Vidal J. , Lopéz de Dicastillo C. , Rodriguez F. , Guarda A. , Cruz R. M. S. , Galotto M. J. 
Published: September 2018

ABSTRACTActive films (AFs) using poly(lactic acid) (PLA) as a polymeric matrix containing various propolis concentrations (5, 8.5, and 13%) as the active agent (AA) were developed using a casting method. The purpose was to determine the effects of the incorporation of AA on the physical properties of the films and to evaluate the antioxidant and antimicrobial activities. Tensile strength and elastic modulus of the AFs decreased relative to the control (PLA without AA). Introducing the active substances from propolis into the PLA also affected its thermal properties (glass transition). Adding AAs to the polymer generated more opacity with a green‐yellowish color compared to the control. In addition, AFs exhibited reduced water vapor permeability as the AA concentration increased. Biodegradation assay showed that the AFs degraded faster than the control. AFs exhibited antioxidant activity, which was measured as the ability to scavenge free radicals (2,2‐diphenyl‐1‐picrylhydrazyl and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonate)), due to the presence of bioactive compounds (phenolics). Antimicrobial activity was evaluated against Escherichia coli and showed a reduction over 4‐log cycles. Therefore, incorporation of propolis is a useful strategy for the development of active packaging with antioxidant and antimicrobial effects, which increase the shelf life of food products. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47090.
Australia's north, Australia's future: A vision and strategies for sustainable economic, ecological and social prosperity in northern Australia
Authors: Chambers Ian , Russell‐Smith Jeremy , Costanza Robert , Cribb Julian , Kerins Sean , George Melissa , James Glenn , Pedersen Howard , Lane Paul , Christopherson Peter , Ansell Jennifer , Sangha Kamaljit 
Published: September 2018

AbstractThe release of the United Nations Sustainable Development Goals and the Paris Climate Change agreement highlighted the importance of global sustainability internationally. Here, we outline a vision and strategies for developing northern Australia that demonstrate how a focus on sustainable prosperity can both expand historical approaches and current government plans and integrate the biophysical realities with the social, political, and cultural characteristics of the region. We highlight examples of the significant horizontal and vertical integration opportunities that this expanded vision and related strategies provide for (a) land (carbon farming, targeted food production systems, and native title arrangements); (b) water (water resources management); (c) energy (renewable energy production, storage, and distribution); (d) workforce (culturally appropriate ecotourism, Indigenous ranger programs, and protected area management); (e) knowledge services (health care and innovative employment opportunities); and (f) governance (greater participatory governance). We found that realisation of even 10% of these emerging opportunities over the next 10 years alone could result in economic growth worth over AUD 15 billion and 15,000+ jobs for northern Australia as well as the further ecological and social benefits derived from a sustainable prosperity strategy.
Pacific seasonal workers: Learning from the contrasting temporary migration outcomes in Australian and New Zealand horticulture
Authors: Curtain Richard , Dornan Matthew , Howes Stephen , Sherrell Henry 
Published: September 2018

Abstract“Crowding out” is a widely accepted claim in migration analysis, which posits that the preference of profit‐maximising employers for irregular and minimally regulated migrants overregulated alternatives will undermine, if not condemn to failure, well‐regulated temporary migration schemes. In this paper, we test the crowding out hypothesis by examining the experience with well‐regulated seasonal migrant worker programs in the horticultural sectors of Australia and New Zealand. This experience, which in both countries has involved recruitment of workers from the Pacific Islands, has been divergent, despite the two programs being similar in design. Our findings suggest that the relative attractiveness of regulated and unregulated migrant labour sources depends on a range of factors, including the export orientation of the sector, the costs of collective action and regulation, differences in policy design and implementation, and external factors. Depending on industry and economy‐wide characteristics, quality and reputational benefits for employers can offset the cost of regulation.
Development of 10 single‐copy nuclear DNA markers for Euchresta horsfieldii (Fabaceae), a rare medicinal plant
Authors: Priyadi Arief , Feng Chao , Kang Ming , Huang Hongwen 
Published: September 2018

Premise of the StudyEuchresta horsfieldii (Fabaceae) is a rare and endangered medicinal plant in Indonesia with restricted distribution. Single‐copy nuclear DNA (scnDNA) markers were developed for this species to facilitate further investigation of genetic diversity and population structure.Methods and ResultsWe performed RNA‐Seq and de novo assembly of the transcriptome. Ten primer sets were developed for E. horsfieldii, all of which also amplified in E. japonica and E. tubulosa.ConclusionsThese scnDNA markers will be an important resource for the study of genetic diversity and population structure of E. horsfieldii and other species in the genus Euchresta.
Structural break detection in financial durations
Authors: Zhang Yaohua , Ravishanker Nalini , Zou Jian 
Published: September 2018

AbstractHigh‐frequency financial data are more readily available and provide a deeper understanding of market infrastructure, market dynamics, and structural instability. The class of autoregressive conditional duration models is useful for statistical analysis of intra‐event durations in asset prices. Often, time series of durations exhibit structural breaks that may be due to change in level, or change in model order, or change in parameter values. This article studies the structural break detection problem in univariate time series of durations using penalized estimating functions. A retrospective algorithm based on the entire data allows simultaneous detection of the number of structural breaks, locations of the structural breaks, as well as the model order. This paper also provides a simulation study to compare the proposed algorithm with a Group LASSO method discussed in the literature for piecewise autoregressive models. Our method based on the penalized estimating function is attractive because it provides insights for understanding the stochastic dynamics of high‐frequency financial data.