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Suman K Roy, Debabrata Sengupta, Santi Prasad Rath, Tanushri Saha, Subhas Samanta, Sreebrata Goswami
In this work, ortho-C-N bond fusion reactions of aniline are followed by the use of two different ruthenium mediators. Reaction of aniline with [Ru(III)(terpy)Cl3] (terpy = 2,2':6',2″-terpyridine) resulted in a trans bis-aniline ruthenium(II) complex [1](+) which upon oxidation with H2O2 produced compound [2](+) of a bidentate ligand, N-phenyl-1,2-benzoquinonediimine, due to an oxidative ortho-C-N bond fusion reaction. Complex [1](+) and aniline (neat) at 185 °C produced a bis-chelated ruthenium complex (3)...
April 20, 2017: Inorganic Chemistry
Xinjie Lu
Atherosclerosis is a chronic vascular disease in which atherosclerotic plaques develop in the arterial wall. It is believed that inflammation plays a major role in atherosclerotic formation and progression. Thus, atherosclerosis can be considered as an inflammatory disease of the arterial vessel. Mouse model demonstrated that T and B cell deficiency reduces the atherosclerotic burden in the formation of an atherosclerotic lesion. CD4+ T helper cells (Th), such as Th1 cells known being the major CD4+ T cell subtype found in mouse models of atherogenesis, increase plaque formation caused by oxLDL...
April 19, 2017: Current Medicinal Chemistry
Brooke E Roman, Dana Driksna, Mohamed M Abouzied, Frank Klein, Jennifer Rice
Neogen Corp. (Lansing, MI) has developed a common aqueous extraction method for the detection of mycotoxins in the ELISA or lateral flow format. The Veratox(®) for Total Aflatoxin ELISA extraction method uses a MAX 2 extraction packet and water in replacement of traditionally used organic solvents. Veratox for Total Aflatoxin has a detection range of 5–50 ppb neat or up to 300 ppb with dilution. The kit development focused on superior cross-reactivity, ability to accurately detect naturally contaminated samples, and utilization of an aqueous extraction method...
April 18, 2017: Journal of AOAC International
Amith L Shetty, Caleb Teh, Matthew Vukasovic, Shannon Joyce, Milan R Vaghasiya, Roberto Forero
OBJECTIVE: The ED discharge stream short stay units (EDSSUs) aim to facilitate patient flows through EDs. We investigate the relationship between EDSSU census and hospital bed occupancy rates (BORs) on National Emergency Access Target (NEAT) performance and did-not-wait (DNW) rates at a tertiary metropolitan adult ED in Sydney, Australia. METHODS: We collated data for all ED presentations between 1 January 2012 and 31 December 2014. Daily ED, EDSSU census and ED-accessible hospital BORs were tabulated with daily ED NEAT performance and DNW rates...
April 16, 2017: Emergency Medicine Australasia: EMA
Jan Horstmann, Mentor Hyseni, Andreas Mix, Beate Neumann, Hans-Georg Stammler, Norbert W Mitzel
Bidentate gallium Lewis acids were prepared by the reaction of diethynyldiphenylsilane with neat trimethyl- or triethylgallium. Bis[(dimethylgallyl)ethynyl]diphenylsilane (1) and diethylgallyl derivative 2 were characterized as Et2 O or pyridine adducts by NMR spectroscopy; 2⋅2Py was isolated. Lewis acids 1 and 2 form host-guest adducts with bidentate nitrogen bases, but defined cyclic 1:1 adducts are only formed between 1 and bases with matching N⋅⋅⋅N distances: 4,4'-dimethyl-3,3'-bipyridinylacetylene (3), bis[(pyridin-3-yl)ethynyl]diphenylsilane (4), and bis[(2-methylpyridin-5-yl)ethynyl]diphenylsilane (5)...
April 18, 2017: Angewandte Chemie
Mathew Anker, Choumini Balasanthiran, Vagulejan Balasanthiran, Malcolm H Chisholm, Savithra Jayaraj, Kaleb Mathieu, Parichat Piromjitpong, Siriwan Praban, Balaram Raya, William J Simonsick
Tetraphenylporphyrin aluminum(iii) salts, TPPAlX, where X = Me, OEt, OiPr, OCHMeCH2Cl, and Cl, and bis(triphenylphosphine)imminium chloride, PPN(+)Cl(-) (1 : 1) react with rac-lactide, rac-LA, in neat propylene oxide, PO, to yield chains of enriched isotactic polylactide, PLA, with end groups of PO-Cl and with time these yield cyclic polymers (PO)n(PLA) where n = 2 or 3 and even higher. There is no reaction between TPPAlOR (R = Et or (i)Pr), PPN(+)Cl(-), and rac-LA in neat THF at 25 °C even though TPPAlOR (R = Et or (i)Pr) and PPN(+)Cl(-) in neat PO yields polypropylene oxide with a terminal OR group, H(PO)nOR...
April 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Washington Luiz Oliani, Duclerc Fernandes Parra, Luiz Gustavo Hiroki Komatsu, Nilton Lincopan, Vijaya Kumar Rangari, Ademar Benevolo Lugao
This paper presents a study on biocidal effect of polymer nanocomposite films of gamma irradiated polypropylene (PP) and silver nanoparticles. The modified polypropylene was obtained from isotactic polypropylene (iPP) in pellets form by irradiation with gamma rays in the presence of acetylene. A new morphology with long chain branching of PP and distinct rheology is obtained by this process. The blend of 50/50wt% neat PP and PP modified by gamma radiation were further mixed using a twin screw extruder. The AgNPs were infused into this polymer blend at different concentrations of: 0...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Qurat Ul Ain, Ahmad Nawaz Khan, Mahboubeh Nabavinia, Mohammad Mujahid
The bioactivity and mechanical properties of hybrid composites of hydroxyapatite (HA) in cyclic olefinic copolymer (COC) also known commercially as TOPAS are investigated, first time, for regeneration and repair of the bone tissues. HA is synthesized to obtain the spherically shaped nanoparticles in the size range of 60±20nm. Various concentrations of HA ranging from 1 to 30wt% are dispersed in TOPAS using sodium dodecyl sulfate (SDS) coupling agent for better dispersion and interaction of hydrophilic HA with hydrophobic TOPAS...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Daniel Santos, Cristina O Correia, Dina M Silva, Pedro S Gomes, Maria H Fernandes, José D Santos, Vitor Sencadas
Tissue engineering is constantly evolving towards novel materials that mimic the properties of the replaced injured tissue or organ. A hybrid electrospun membrane of electroactive poly(l-acid lactic) (PLLA) polymer with glass reinforced hydroxyapatite (Bonelike®) microparticles placed among the polymer fibres in a morphology like "islands in the sea" was processed. The incorporation of 60 to 80wt% Bonelike® bone grafts granules with ≤150μm into the polymer solution lead to an amorphous polymeric fibre membranes, and a decrease of the average polymer fibre diameter from 550±150nm for neat PLA down to 440±170nm for the hybrid composite...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Fahad Alam, Kantesh Balani
A single-cell force spectroscopy is utilized to characterize the dynamics of the transient interaction (0-10s) between alive Staphylococcus aureus and ultra-high molecular weight polyethylene (UHMWPE). Adhesion force of bacteria upon addition of antibacterial additives (i.e. silver (Ag) nanoparticles and zinc oxide (ZnO) micro-rods) has been evaluated. Addition of Ag and ZnO reduces the colony forming units (CFUs) from 93±7 (UHMWPE) to 23±5 (U+3wt.% Ag+3wt.% ZnO) on 10×10mm(2) area of sample surface. Presence of ZnO causes increase in the surface free energy from 29...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Keqing Zhou, Rui Gao
Significant improvements in thermal stability and fire resistance properties of polymer materials with nanofillers at low loadings hold tremendous promise for fire safety materials. In this study, a novel two dimensional (2D) graphene-like nanomaterial (VOP) was synthesized by a simple refluxing method and then modified with typical organic surfactants. Subsequently, the novel graphene-like nanomaterials were incorporated into polystyrene (PS) matrix for reducing fire hazards. The SEM and TEM images indicated that the VOP nanosheets were well dispersed throughout the matrix without obvious aggregates, leading to remarkable improvements of thermal stability and fire safety properties...
April 7, 2017: Journal of Colloid and Interface Science
Lijuan Xu, Shufang Wang, Xiang Sui, Yu Wang, Yinan Su, Li Huang, Yunwei Zhang, Zheng Chen, Qianqian Chen, Haitao Du, Yaopeng Zhang, Li Yan
The shortage of organ donation is the main limitation to liver transplantation as a treatment for the end-stage liver disease or acute liver failure. In order to develop an alternative therapy for acute liver failure, mesenchymal stem cells (MSCs) seeded regenerated silk fibroin (RSF) matrices were evaluated in vitro and in vivo. Adipose-derived mesenchymal stem cells (ADSCs) and bone marrow-derived mesenchymal stem cells (BMSCs) were planted and grown on RSF scaffolds to form scaffolds complex, respectively...
April 14, 2017: ACS Applied Materials & Interfaces
Samaneh Ghasemian, Mohammad Ali Sahari, Mohsen Barzegar, Hasan Ahmadi Gavlighi
In this study, polyvinylidene fluoride (PVDF) and nano-porous silica particle were used to fabricate an asymmetric nano-composite membrane. Silica particles enhanced the thermal stability of PVDF/SiO2 membranes; increasing the decomposition temperature from 371°C to 408°C. Cross sectional morphology showed that silica particles were dispersed in polymer matrix uniformly. However, particle agglomeration was found at higher loading of silica (i.e., 20 by weight%). The separation performance of nano-composite membranes was also evaluated using the omega-3 polyunsaturated fatty acids (PUFA) concentration at a temperature and pressure of 30°C and 4bar, respectively...
September 1, 2017: Food Chemistry
Pedro P Madeira, Helena Passos, Joana Gomes, João A P Coutinho, Mara G Freire
Although highly relevant to a priori select adequate solvents for a given application, the determination of the hydrogen-bond acidity or proton donor ability of aqueous solutions of ionic liquids is a difficult task due to the poor solubility of the commonly used probes in aqueous media. In this work, we demonstrate the applicability of the pyridine-N-oxide probe to determine the hydrogen-bond acidity of both neat ionic liquids and their aqueous solutions, based on (13)C NMR chemical shifts, and the suitability of these values to appraise the ability of ionic liquids to form aqueous two-phase systems...
April 13, 2017: Physical Chemistry Chemical Physics: PCCP
Bruno Grisci, Márcio Dorn
The development of computational methods to accurately model three-dimensional protein structures from sequences of amino acid residues is becoming increasingly important to the structural biology field. This paper addresses the challenge of predicting the tertiary structure of a given amino acid sequence, which has been reported to belong to the NP-Complete class of problems. We present a new method, namely NEAT-FLEX, based on NeuroEvolution of Augmenting Topologies (NEAT) to extract structural features from (ABS) proteins that are determined experimentally...
March 16, 2017: Journal of Bioinformatics and Computational Biology
Giuseppe Ambrosio, Erberto Carluccio, Maurizio Ferratini
No abstract text is available yet for this article.
February 2017: Giornale Italiano di Cardiologia
Shuying Wu, Jin Zhang, Raj B Ladani, Anil R Ravindran, Adrian P Mouritz, Anthony J Kinloch, Chun H Wang
Highly flexible and deformable electrically conductive materials are vital for the emerging field of wearable electronics. To address the challenge of flexible materials with a relatively high electrical conductivity and a high elastic limit, we report a new and facile method to prepare porous polydimethylsiloxane/carbon nanofiber composites (denoted by p-PDMS/CNF). This method involves using sugar particles coated with carbon nanofibers (CNFs) as the templates. The resulting three-dimensional porous nanocomposites, with the CNFs embedded in the PDMS pore walls, exhibit a greatly increased failure strain (up to ∼94%) compared to that of the solid, neat PDMS (∼48%)...
April 17, 2017: ACS Applied Materials & Interfaces
Rodorico Giorgi, Michele Baglioni, Piero Baglioni
One of the main problems connected to the conservation of street art is the selective removal of overlying undesired graffiti, i.e., drawings and tags. Unfortunately, selective and controlled removal of graffiti and overpaintings from street art is almost unachievable using traditional methodologies. Recently, the use of nanofluids confined in highly retentive pHEMA/PVP semi-interpenetrated polymer networks was proposed. Here, we report on the selective removal of acrylic overpaintings from a layer of acrylic paint on mortar mockups in laboratory tests...
April 10, 2017: Analytical and Bioanalytical Chemistry
Taira Tasaki, Yifei Guo, Qi Meng, Muhammad Abdullah Al Mamun, Yusuke Kasahara, Shuichi Akasaka, Atsuhiro Fujimori
The formation behavior of organized organo-modified-nanodiamond films and polymer nanocomposites has been investigated using nanodiamonds of several different particle sizes and outermost-surface compositions. The nanodiamond particle sizes used in this study were 3 and 5 nm and the outermost surface contained -OH and/or -COOH groups. The nanodiamond was organo-modified to prepare -OH2+ cation and -COO- anions on the outermost surface by carboxylic anion of fatty acid and long-chain phosphonium cation, respectively...
April 10, 2017: ACS Applied Materials & Interfaces
Thomas Rüther, Mitsuhiro Kanakubo, Adam S Best, Kenneth R Harris
Transport properties are examined in some detail for samples of the low temperature molten salt N-propyl-N-methyl pyrrolidinium bis(fluorosulfonyl)imide [Pyr13][FSI] from two different commercial suppliers. A similar set of data is presented for two different concentrations of binary lithium-[Pyr13][FSI] salt mixtures from one supplier. A new and significantly different production process is used for the synthesis of Li[FSI] as well as the [Pyr13](+) salt used in the mixtures. Results for the viscosity, conductivity, and self-diffusion coefficients, together with the density and expansivity and apparent molar volume, are reported over the temperature range of (0 to 80) °C...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
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