bluuebunny/crossref_metadata_2025_split huggingface dataset:
Turn‐On Luminescence Sensing and Real‐Time Detection of Traces of Water in Organic Solvents by a Flexible Metal–Organic Framework
Authors: Douvali Antigoni , Tsipis Athanassios C. , Eliseeva Svetlana V. , Petoud Stéphane , Papaefstathiou Giannis S. , Malliakas Christos D. , Papadas Ioannis , Armatas Gerasimos S. , Margiolaki Irene , Kanatzidis Mercouri G. , Lazarides Theodore , Manos Manolis J. 
Published: December 2014

AbstractThe development of efficient sensors for the determination of the water content in organic solvents is highly desirable for a number of chemical industries. Presented herein is a Mg2+ metal–organic framework (MOF), which exhibits the remarkable capability to rapidly detect traces of water (0.05–5 % v/v) in various organic solvents through an unusual turn‐on luminescence sensing mechanism. The extraordinary sensitivity and fast response of this MOF for water, and its reusability make it one of the most powerful water sensors known.
Polymeric membrane modification using SPEEK and bentonite for ultrafiltration of dairy wastewater
Authors: Pagidi Aruna , Lukka Thuyavan Y. , Arthanareeswaran G. , Ismail A. F. , Jaafar Juhana , Paul Diby 
Published: December 2014

ABSTRACTThe different polymeric membrane materials were fabricated using modifiers such as sulfonated poly(ether ether ketone) (SPEEK) and bentonite for effective ultrafiltration of proteins from dairy effluent. Polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyetherimide (PEI), polyamide‐imides (PAI), cellulose acetate (CA), and polyphenylsulfone (PPSU) were selected for modification. Membrane morphology and functional group analysis were characterized using scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR). Pure water permeability (64.66 × 10−9m/s kPa) was higher for the PES/SPEEK/bentonite membrane when compared with other polymeric membranes. Contact angle (54.05°) value was lower for CA/SPEEK/bentonite membranes and which indicates that hydrophilicity has got enhanced. The membrane performance was tested using model dairy wastewater by ultrafiltration under longer run mode. Further it was evaluated using resistance in series model. This study infers that modification of membranes using charged SPEEK polymer and nanofiller as bentonite can be used to alleviate the fouling in the treatment of dairy wastewater. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2015,132, 41651.
Microwave processing of SiC nanoparticles infused polymer composites: Comparison of thermal and mechanical properties
Authors: Rabby Md. Reza‐E‐ , Jeelani Shaik , Rangari Vijaya K. 
Published: December 2014

ABSTRACTThe goal of this study is to compare thermal and mechanical properties of an epoxy resin system reinforced with SiC nanoparticles using both conventional thermal curing and microwave irradiation techniques. The microwave curing technique has shown potential benefits in processing polymeric nanocomposites by reducing the curing time without compromising the thermo‐mechanical performances of the materials. It was observed from this investigation that, the curing time was drastically reduced to ∼30 min for microwave curing instead of 12 h room temperature curing with additional 6 h post curing at 75°C. Ductile behavior was more pronounced for microwave curing technique while thermal curing showed brittle like behavior as revealed from flexural test. The maximum strain to failure was increased by 25–40% for microwave‐cured nanocomposites over the room temperature cured nanocomposites for the same loading of nanofillers. The glass transition temperature (Tg) also increased by ∼14°C while curing under microwave irradiation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41708.
Recent advances in nanocellulose for biomedical applications
Authors: Jorfi Mehdi , Foster E. Johan 
Published: December 2014

ABSTRACTNanocellulose materials have undergone rapid development in recent years as promising biomedical materials because of their excellent physical and biological properties, in particular their biocompatibility, biodegradability, and low cytotoxicity. Recently, a significant amount of research has been directed toward the fabrication of advanced cellulose nanofibers with different morphologies and functional properties. These nanocellulose fibers are widely applied in medical implants, tissue engineering, drug delivery, wound‐healing, cardiovascular applications, and other medical applications. In this review, we reflect on recent advancements in the design and fabrication of advanced nanocellulose‐based biomaterials (cellulose nanocrystals, bacterial nanocellulose, and cellulose nanofibrils) that are promising for biomedical applications and discuss material requirements for each application, along with the challenges that the materials might face. Finally, we give an overview on future directions of nanocellulose‐based materials in the biomedical field. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41719.
Structure‐property relationships in copolyester elastomer‐layered silicate nanocomposites
Authors: Alosime Eid M. , Edwards Grant A. , Martin Darren J. 
Published: December 2014

ABSTRACTWhile the field of polymer–clay nanocomposites is reaching maturity, some parts of the studied systems still present researchers with possibilities for the improvement of material properties. This study entails the understanding of the relationships in copolyester elastomer/organically modified layered silicate nanocomposite and the structure–property relationships within the system of the nanocomposite. A series of these nanocomposites was prepared via twin‐screw extrusion melt compounding. The experiments included the following three types of synthetic organosilicates: high aspect ratio Somasif (ME100) fluoromica and two lower aspect ratio Laponite synthetic hectorites, (WXFN) and (WXFP). These organosilicates were modified with quaternary octadecyltrimethylammonium bromide (ODTMA) and were used to prepare the nanocomposites. The nanocomposite structure on a micro‐ and nanometre scales was evaluated by two techniques, such as X‐ray diffraction (XRD) and transmission electron microscopy (TEM). The mechanical properties of the nanocomposites were examined to determine the impact aspect ratio of the nanofiller and wt % loading have on performance. The addition of the 2 wt % high aspect ratio of ME100‐ODTMA, in particular, showed statistically improved tensile strength, tear resistance, creep resistance, and water vapor permeation barrier enhancement. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41742.
Synthesis, characterization, and performance evaluation of the AM/AMPS/DMDAAC/SSS quadripolymer as a fluid loss additive for water‐based drilling fluid
Authors: Bai Xiaodong , Yang Yi , Xiao Dingyuan , Pu Xiaolin , Wang Xu 
Published: December 2014

ABSTRACTAccording to the molecular structure design requirements of the fluid loss additive resistant to high temperature, 2‐acrylamide‐2‐methyl propane sulfonic acid (AMPS), acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC) and sodium styrene sulfonate (SSS) are selected as the structure monomers. Using ammonium persulfate as initiator, a new quadripolymer is synthesized through free radical aqueous solution polymerization. According to the minimum filtration loss of the fresh water‐based drilling fluid with 0.5 wt % quadripolymer, The synthesis conditions are optimized by orthogonal test: the mole ratio of AMPS/AM/DMDAAC/SSS is 5/7/2/1, the monomer concentration is 30 wt %, the initiator concentration is 0.8 wt %, the reaction temperature is 75°C and the pH is 10. The structure of the quadripolymer is characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy. The results show that the quadripolymer contains all the designed functional groups. The thermal stability of the quadripolymer is tested by thermogravimetry, differential thermogravimetry, and differential scanning calorimetry. The results show that the thermal degradation of the quadripolymer is not obvious before 272.3°C. The rheological performance and filtration loss of the quadripolymer are evaluated. The results indicate that the filtration loss decreases with the increasing dosage of the quadripolymer before and after thermal aging test at 180°C for 16 h, and the filtration loss before the thermal aging test is smaller than that after the thermal aging test. The high temperature high pressure filtration loss (FL(HTHP)) experiment results also show that the quadripolymer fluid loss additive has excellent temperature‐resistant performance. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41762.
Copper‐Catalyzed Formal CH Carboxylation of Aromatic Compounds with Carbon Dioxide through Arylaluminum Intermediates
Authors: Ueno Atsushi , Takimoto Masanori , O Wylie W. N. , Nishiura Masayoshi , Ikariya Takao , Hou Zhaomin 
Published: December 2014

AbstractThe CH bond carboxylation of various aromatic compounds with CO2 was achieved by the deprotonative alumination with a mixed alkyl amido lithium aluminate compound iBu3Al(TMP)Li followed by the NHC‐copper‐catalyzed carboxylation of the resulting arylaluminum species, which afforded the corresponding carboxylation products in high yield and high selectivity. In addition to benzene derivatives, heteroarenes such as benzofuran, benzothiophene, and indole derivatives are also suitable substrates. Functional groups such as Cl, Br, I, vinyl, amide, and CN could survive the reaction conditions. Some key reaction intermediates such as the copper aryl and isobutyl complexes and their carboxylation products were isolated and structurally characterized by X‐ray crystallographic analyses, thus offering important information on the reaction mechanism.
Exploring the consequences of a representative “disallowed” conformation of Aib on a 310‐helical fold
Authors: Tumminakatti Shama , Reddy Damodara N. , Prabhakaran Erode N. 
Published: December 2014

ABSTRACTThe structural effects of a representative “disallowed” conformation of Aib on the 310‐helical fold of an octapeptidomimetic are explored. The 1D (1H, 13C) & 2D NMR, FT‐IR and CD data reveal that the octapeptide 1, adopts a 310‐helical conformation in solution, as it does in its crystal structure. The C‐terminal methyl carboxylate (CO2Me) of 1 was modified into an 1,3‐oxazine (Oxa) functional group in the peptidomimetic 2. This modification results in the stabilization of the backbone of the C‐terminal Aib (Aib*‐Oxa) of 2, in a conformation (ϕ, ψ = 180, 0) that is natively disallowed to Aib. Consequent to the presence of this natively disallowed conformation, the 310‐helical fold is not disrupted in the body of the peptidomimetic 2. But the structural distortions that do occur in 2 are primarily in residues in the immediate vicinity of the natively disallowed conformation, rather than in the whole peptide body. Non‐native electronic effects resulting from modifications in backbone functional groups can be at the origin of stabilizing residues in natively disallowed conformations. © 2014 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 104: 21–36, 2015.
Diarylheptanoids from Green Alder Bark and Their Potential for DNA Protection
Authors: Novaković Miroslav , Stanković Miroslava , Vučković Ivan , Todorović Nina , Trifunović Snežana , Apostolović Danijela , Mandić Boris , Veljić Milan , Marin Petar , Tešević Vele , Vajs Vlatka , Milosavljević Slobodan 
Published: December 2014

AbstractNine diarylheptanoids, 1–9, catechin (11), and a phenolic glucoside, 10, were isolated from the bark of green alder (Alnus viridis). Four of the isolated compounds, i.e., 2, 5, 8, 10, are new. The structures of 1–11 were determined on the basis of spectroscopic data. All isolated compounds were evaluated for their in vitro protective effects on chromosome aberrations in peripheral human lymphocytes using cytokinesis‐block micronucleus (CBMN) assay. Almost all of them exerted a pronounced effect of decreasing DNA damage of human lymphocytes, acting stronger than the known synthetic protector amifostine.
Inhibition of CREB Phosphorylation by Conjugates of Adenosine Analogues and Arginine‐Rich Peptides, Inhibitors of PKA Catalytic Subunit
Authors: Kriisa Marie , Sinijärv Hedi , Vaasa Angela , Enkvist Erki , Kostenko Sergiy , Moens Ugo , Uri Asko 
Published: December 2014

AbstractBisubstrate inhibitors of protein kinases associate simultaneously with two substrate‐binding sites of the kinase and thus potentially possess better inhibitory potency and selectivity than inhibitors binding to only the conserved ATP‐site of the kinase. We have previously used conjugates of adenosine analogues and arginine‐rich peptides (ARCs) to develop proteolytically stable cell plasma membrane‐permeable bisubstrate inhibitors whose biochemical affinities towards several basophilic protein kinases of the AGC group are in the picomolar range. The potency of bisubstrate inhibitors to affect the phosphorylation of proteins in living cells has been described in a limited number of publications. In this study, the effect of ARCs on the protein kinase A (PKA)‐catalysed cAMP response element‐binding protein (CREB) phosphorylation pathway was studied in living mammalian cells. Our results demonstrate that at low micromolar extracellular concentration N‐myristoylated ARCs are capable of reducing the activity of transcription factor CREB through inhibition of PKA.
Dynamics of the Intrinsically Disordered C‐Terminal Domain of the Nipah Virus Nucleoprotein and Interaction with the X Domain of the Phosphoprotein as Unveiled by NMR Spectroscopy
Authors: Baronti Lorenzo , Erales Jenny , Habchi Johnny , Felli Isabella C. , Pierattelli Roberta , Longhi Sonia 
Published: December 2014

AbstractWe provide an atomic‐resolution description based on NMR spectroscopy, of the intrinsically disordered C‐terminal domain of the Nipah virus nucleoprotein (NTAIL), both in its isolated state and within the nucleocapsid (NC). Within the NC the second half of NTAIL retains conformational behavior similar to that of isolated NTAIL, whereas the first half of NTAIL becomes much more rigid. In spite of the mostly disordered nature of NTAIL, chemical shifts and relaxation measurements show a significant degree of α‐helical sampling in the molecular recognition element (MoRE) involved in binding to the X domain (XD) of the phosphoprotein, with this preconfiguration being more pronounced than in the NTAIL domain from the cognate Hendra virus. Outside the MoRE, an additional region exhibiting reduced flexibility was identified within NTAIL and found to be involved in binding to the XD. 1H‐ and 13C‐detected titration NMR experiments support a highly dynamic binding of NTAIL at the surface of the XD.
Angiotensin‐converting enzyme inhibitors‐induced angioedema treated by C1 esterase inhibitor concentrate (Berinert®): about one case and review of the therapeutic arsenal
Authors: Lipski Samuel Michael , Casimir Georges , Vanlommel Martine , Jeanmaire Mathieu , Dolhen Pierre 
Published: December 2014

Key Clinical MessageC1 esterase inhibitor (Berinert®) is generally used to treat severe attack of hereditary angioedema. We describe here the case of a patient who presented with a severe angioedema induced by angiotensin‐converting enzyme inhibitors (ACEIs) endangering her life. It could be successfully treated with that medicine.
A Double Conformationally Restricted Dynamic Supramolecular System for the Substrate‐Selective Epoxidation of Olefins—A Comparative Study on the Influence of Preorganization
Authors: Lindbäck Emil , Cherraben Sawsen , Francoïa Jean‐Patrick , Sheibani Esmaeil , Lukowski Bartosz , Proñ Agnieszka , Norouzi‐Arasi Hassan , Månsson Kristoffer , Bujalowski Pawel , Cederbalk Anna , Pham Thanh Huong , Wixe Torbjörn , Dawaigher Sami , Wärnmark Kenneth 
Published: December 2014

AbstractA double conformationally restricted kinetically labile supramolecular catalytic system, the third generation, was designed and synthesized. We investigated the substrate selectivity of this system by performing competitive pairwise epoxidations of pyridyl‐ and phenyl‐appended olefins. We compared the obtained substrate selectivities to previous less preorganized generations of this system. Five different substrate pairs were investigated, and the present double conformationally restricted system showed higher normalized substrate selectivities (pyridyl versus phenyl) for two of the substrate pairs than the previous less conformationally restricted generations. As for the preorganization of the components of the system, the catalyst, and the receptor part, it was shown that for each substrate pair there was one generation that was better than the other to generate substrate‐selective catalysis.
Bifunctional One‐Component Catalysts for the Addition of Carbon Dioxide to Epoxides
Authors: Büttner Hendrik , Lau Kornelia , Spannenberg Anke , Werner Thomas 
Published: December 2014

AbstractSeveral bifunctional ammonium salts were synthesized and employed as one‐component catalysts for the conversion of CO2 and epoxides to produce cyclic carbonates. These catalysts show superior activities compared to their monofunctional analogs. A turnover number of up to 693 and a turnover frequency of up 392 h−1 could be achieved for the best catalyst. Moreover, the effect of various solvents has been studied. All employed solvents and the product formed had a negative influence on substrate conversion. The scope and limitation of the reaction has been studied carefully for two general reaction protocols at 45 and 90 °C. In over 20 examples, the isolated yields after filtration were 90 %. In addition, we present the first organocatalyzed synthesis of a cyclohexene‐based naturally occurring cyclic carbonate, and its molecular structure was determined by XRD. Furthermore, we demonstrate that the reaction can be performed even on a multigram scale and can be monitored by in situ FTIR spectroscopy.
Selective Aerobic Benzylic Alcohol Oxidation of Lignin Model Compounds: Route to Aryl Ketones
Authors: Dawange Monali , Galkin Maxim V. , Samec Joseph S. M. 
Published: December 2014

AbstractA mild and chemoselective oxidation of the α‐alcohol in β‐O‐4′‐ethanoaryl and β‐O‐4′‐glycerolaryl ethers has been developed. The benzylic alcohols were selectively dehydrogenated to the corresponding ketones in 60–93 % yield. A one‐pot selective route to aryl ethyl ketones was performed. The catalytic system comprises recyclable heterogeneous palladium, mild reaction conditions, green solvents, and oxygen in air as oxidant. Catalytic amounts of a coordinating polyol were found pivotal for an efficient aerobic oxidation.
Titania Nanoparticles Stabilized HPA in SBA‐15 for the Intermolecular Hydroamination of Activated Olefins
Authors: Sawant‐Dhuri Dhanashri , Balasubramanian Veerappan V. , Ariga Katsuhiko , Park Dae‐Hwan , Choy Jin‐Ho , Cha Wang Soo , Al‐deyab Salem S. , Halligudi Shivappa B. , Vinu Ajayan 
Published: December 2014

AbstractThe front cover artwork for Issue 12/2014 is a collaborative research between India, Japan, Australia, Korea and Saudi Arabia. The image shows the highly selective and active nanoparticle stabilized mesoporous catalytic system for the hydroamination of aromatic and aliphatic amines. See the Full Paper itself on page http://dx.doi.org/10.1002/cctc.201402449.
Spin Frustration in a Family of Pillared Kagomé Layers of High‐Spin Cobalt(II) Ions
Authors: Wang Long‐Fei , Li Cui‐Jin , Chen Yan‐Cong , Zhang Ze‐Min , Liu Jiang , Lin Wei‐Quan , Meng Yan , Li Quan‐Wen , Tong Ming‐Liang 
Published: December 2014

AbstractBased on the analogous kagomé [Co3(imda)2] layers (imda=imidazole‐4,5‐dicarboxylate), a family of pillar‐layered frameworks with the formula of [Co3(imda)2(L)3]⋅(L)n⋅xH2O (1: L=pyrazine, n=0, x=8; 2: L=4,4′‐bipyridine, n=1, x=8; 3: L=1,4‐di(pyridin‐4‐yl)benzene, n=1, x=13; 4: L=4,4′‐di(pyridin‐4‐yl)‐1,1′‐biphenyl, n=1, x=14) have been successfully synthesized by a hydrothermal/solvothermal method. Single‐crystal structural analysis shows a significant increase in the interlayer distances synchronized with the extension of the pillar ligands, namely, 7.092(3) (1), 10.921(6) (2), 14.780(5) (3), and 19.165(4) Å (4). Despite the wrinkled kagomé layers in complexes 2–4, comprehensive magnetic characterizations revealed weakening of interlayer magnetic interactions and an increase in the degree of frustration as the pillar ligand becomes longer from 1 to 4; this leads to characteristic magnetic ground states. For compound 4, which has the longest interlayer distance, the interlayer interaction is so weak that the magnetic properties observed within the range of temperature measured would correspond to the frustrated layer.
A Bismuth‐Based Metal–Organic Framework as an Efficient Visible‐Light‐Driven Photocatalyst
Authors: Wang Guanzhi , Sun Qilong , Liu Yuanyuan , Huang Baibiao , Dai Ying , Zhang Xiaoyang , Qin Xiaoyan 
Published: December 2014

AbstractA visible‐light‐responsive bismuth‐based metal–organic framework (Bi‐mna) is demonstrated to show good photoelectric and photocatalytic properties. Combining experimental and theoretical results, a ligand‐to‐ligand charge transfer (LLCT) process is found to be responsible for the high performance, which gives rise to a longer lifetime of photogenerated charge carriers. Our results suggest that bismuth‐based MOFs could be promising candidates for the development of efficient visible‐light photocatalysts.
Hierarchical‐Structured Anatase‐Titania/Cellulose Composite Sheet with High Photocatalytic Performance and Antibacterial Activity
Authors: Luo Yan , Huang Jianguo 
Published: December 2014

AbstractBulk hierarchical anatase‐titania/cellulose composite sheets were fabricated by subjecting an ultrathin titania gel film pre‐deposited filter paper to a solvo‐co‐hydrothermal treatment by using titanium butoxide as the precursor to grow anatase‐titania nanocrystallites on the cellulose nanofiber surfaces. The titanium butoxide specie is firstly absorbed onto the nanofibers of the cellulose substance through a solvothermal process, which was thereafter hydrolyzed and crystallized upon the subsequent hydrothermal treatment, leading to the formation of fine anatase‐titania nanoparticles with sizes of 2–5 nm uniformly anchored on the cellulose nanofibers. The resulting anatase‐titania/cellulose composite sheet shows a significant photocatalytic performance towards degradation of a methylene blue dye, and introduction of silver nanoparticles into the composite sheet yields an Ag‐NP/anatase‐titania/cellulose composite material possessing excellent antibacterial activity against both Gram‐positive and Gram‐negative bacteria.
Halogen Bonding Controls the Regioselectivity of the Deiodination of Thyroid Hormones and their Sulfate Analogues
Authors: Manna Debasish , Mondal Santanu , Mugesh Govindasamy 
Published: December 2014

AbstractThe type 1 iodothyronine deiodinase (1D‐1) in liver and kidney converts the L‐thyroxine (T4), a prohormone, by outer‐ring (5′) deiodination to biologically active 3,3′,5‐triiodothyronine (T3) or by inner‐ring (5) deiodination to inactive 3,3′,5′‐triiodothronine (rT3). Sulfate conjugation is an important step in the irreversible inactivation of thyroid hormones. While sulfate conjugation of the phenolic hydroxyl group stimulates the 5‐deiodination of T4 and T3, it blocks the 5′‐deiodination of T4. We show that thyroxine sulfate (T4S) undergoes faster deiodination as compared to the parent thyroid hormone T4 by synthetic selenium compounds. It is also shown that ID‐3 mimics, which are remarkably selective to the inner‐ring deiodination of T4 and T3, changes the selectivity completely when T4S is used as a substrate. From the theoretical investigations, it is observed that the strength of halogen bonding increases upon sulfate conjugation, which leads to a change in the regioselectivity of ID‐3 mimics towards the deiodination of T4S. It has been shown that these mimics perform both the 5′‐ and 5‐ring deiodinations by an identical mechanism.