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https://www.readbyqxmd.com/read/28636316/a-novel-melamine-o-phthalaldehyde-covalent-organic-frameworks-nanaosheets-enhancement-flame-retardant-and-mechanical-performances-of-thermoplastic-polyurethanes
#1
Xiaowei Mu, Jing Zhan, Xiaming Feng, Bihe Yuan, Shuilai Qiu, Lei Song, Yuan Hu
Covalent organic frameworks (COFs) nanosheets prepared from condensation reaction between melamine and o-phthalaldehyde are firstly prepared through ball milling and then incorporated into thermoplastic polyurethanes (TPU) by solution mixing. Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectrometer are applied to characterize COFs nanosheets. It is observed apparently from TEM image that COFs nanosheets are obtained...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636183/ordination-with-any-dissimilarity-measure-a-weighted-euclidean-solution
#2
Michael Greenacre
The classical approach to ordination is to use variants of the Euclidean distance to measure differences between samples (e.g. sites in a community study) based on their observation vectors (e.g. abundance counts for a set of species). Examples are: Euclidean distance on standardized or log-transformed data, on which principal component analysis and redundancy analysis are based; chi-square distance, on which (canonical) correspondence analysis is based; and Hellinger distance, using square roots of relative values in each multivariate vector...
June 21, 2017: Ecology
https://www.readbyqxmd.com/read/28634153/beyond-basic-feedback-in-mobile-brief-interventions-designing-sms-message-content-for-delivery-to-young-adults-during-risky-drinking-events
#3
Cassandra J C Wright, Paul M Dietze, Megan S C Lim
BACKGROUND: Brief interventions can reduce alcohol consumption in young people through screening and delivery of personally relevant feedback. Recently, Web and mobile platforms have been harnessed to increase the reach of brief interventions. Existing literature on mobile-based alcohol brief interventions indicates mixed use of theory in developing interventions. There is no research available to guide the development of SMS text messaging (short message service, SMS) interventions delivered during risky drinking events...
June 20, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28630677/non-lamellar-lipid-assembly-at-interfaces-controlling-layer-structure-by-responsive-nanogel-particles
#4
Aleksandra P Dabkowska, Maria Valldeperas, Christopher Hirst, Costanza Montis, Gunnar K Pálsson, Meina Wang, Sofi Nöjd, Luigi Gentile, Justas Barauskas, Nina-Juliane Steinke, Gerd E Schroeder-Turk, Sebastian George, Maximilian W A Skoda, Tommy Nylander
Biological membranes do not only occur as planar bilayer structures, but depending on the lipid composition, can also curve into intriguing three-dimensional structures. In order to fully understand the biological implications as well as to reveal the full potential for applications, e.g. for drug delivery and other biomedical devices, of such structures, well-defined model systems are required. Here, we discuss the formation of lipid non-lamellar liquid crystalline (LC) surface layers spin-coated from the constituting lipids followed by hydration of the lipid layer...
August 6, 2017: Interface Focus
https://www.readbyqxmd.com/read/28628721/protonation-of-nitramines-where-does-the-proton-go
#5
Thomas Saal, Martin Rahm, Karl O Christe, Ralf Haiges
The reactions of nitramine, N-methyl nitramine and N,N-dimethyl nitramine with anhydrous HF and the superacids HF/MF5 (M = As, Sb) were investigated at temperatures below -40 °C. In solution, exclusive O-protonation was observed by multinuclear NMR spectroscopy. Whereas no solid product could be isolated from the neat HF solutions even at -78 °C, in the HF/MF5 systems, protonated nitramine MF6- salts were isolated for the first time as moisture-sensitive solids that decompose at temperatures above -40 °C...
June 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28627565/a-stable-gold-i-enyne-species-obtained-by-alkyne-carboauration-in-a-complex-rearrangement
#6
Jéssica Cámara, M Carmen Blanco, Antonio Laguna, Panče Naumov, M Concepción Gimeno
An unprecedented tetranuclear gold derivative with unusual gold-enyne moieties is prepared by a mild and neat rearrangement of a dinuclear gold complex with a bridging bis(diphenylphosphino)alkyne and terminal alkynyl ligands. The complex originates as a consequence of an intramolecular addition of the AuC[triple bond, length as m-dash]CTol fragment to the internal diphosphine triple bond Ph2PC[triple bond, length as m-dash]CPPh2. The crystal structure of the tetranuclear complex shows a dinuclear metallacycle with a very short AuAu bond interaction and bridging phosphino-enyne ligands...
June 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28625870/pax3-and-pax7-mediated-dbx1-regulation-orchestrates-the-patterning-of-intermediate-spinal-interneurons
#7
Chris Gard, Gloria Gonzalez-Curto, Youcef El-Mokhtar Frarma, Elodie Chollet, Nathalie Duval, Valentine Auzié, Frédéric Auradé, Lisa Vigier, Frédéric Relaix, Alessandra Pierani, Frédéric Causeret, Vanessa Ribes
Transcription factors are key orchestrators of the emergence of neuronal diversity within the developing spinal cord. As such, the two paralogous proteins Pax3 and Pax7 regulate the specification of progenitor cells within the intermediate neural tube, by defining a neat segregation between those fated to form motor circuits and those involved in the integration of sensory inputs. To attain insights into the molecular means by which they control this process, we have performed detailed phenotypic analyses of the intermediate spinal interneurons (IN), namely the dI6, V0D, V0VCG and V1 populations in compound null mutants for Pax3 and Pax7...
June 15, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28624422/endovascular-proximal-forearm-arteriovenous-fistula-for-hemodialysis-access-results-of-the-prospective-multicenter-novel-endovascular-access-trial-neat
#8
Charmaine E Lok, Dheeraj K Rajan, Jason Clement, Mercedeh Kiaii, Ravi Sidhu, Ken Thomson, George Buldo, Christine Dipchand, Louise Moist, Joanna Sasal
BACKGROUND: Hemodialysis arteriovenous fistulas (AVFs) are suboptimally used primarily due to problems with maturation, early thrombosis, and patient nonacceptance. An endovascular approach to fistula creation without open surgery offers another hemodialysis vascular access option. STUDY DESIGN: Prospective, single-arm, multicenter study (Novel Endovascular Access Trial [NEAT]). SETTINGS & PARTICIPANTS: Consecutive adult non-dialysis-dependent and dialysis-dependent patients referred for vascular access creation at 9 centers in Canada, Australia, and New Zealand...
June 9, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28623503/investigating-the-suitability-of-carbon-nanotube-reinforced-polymer-in-transcatheter-valve-applications
#9
Monica M Rozeik, David J Wheatley, Terence Gourlay
The current delivery size of transcatheter aortic valves, limited by the thickness of their pericardial leaflets, correlates with a high prevalence of major vascular complications. Polyurethane valves can be developed to a fraction of the thickness of pericardial valves through the addition of carbon nanotubes to reinforce their leaflets. This study investigates the suitability of a novel carbon nanotube reinforced leaflet to reduce the delivery profile of transcatheter aortic valves. Carbon nanotube polyurethane composites were developed with thicknesses of 50 μm and their mechanical properties were determined in relation to various environmental effects...
June 16, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28621921/a-novel-polymer-aerogel-towards-high-dimensional-stability-mechanical-property-and-fire-safety
#10
Ke Shang, Jun-Chi Yang, Zhijie Cao, Wang Liao, Yu-Zhong Wang, David A Schiraldi
Inorganic silica-based aerogels, earliest and widely-used aerogels, have poorer mechanical properties than their organic substitutes, which are flammable. In this study, a novel polymeric aerogel with high strength, inherent flame retardancy and cost-effectiveness, which is based on poly(vinyl alcohol) (PVA) crosslinked with melamine-formaldehyde (MF), was prepared under aqueous condition with an eco-friendly freeze-drying and post-curing process. Combined with the additional rigid MF network and benifited from the resulting unique infrastructure of inter-crosslinked flexible PVA segments and rigid MF segments, PVA-based aerogels exibited a significantly decreased degradation rate, and sharply decreased peak heat release rate (PHRR) in cone calorimeter tests (by as much as 83%) compared with neat PVA...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621780/structure-property-relationship-of-blue-solid-state-emissive-phenanthroimidazole-derivatives
#11
Agne Ivanauskaite, Ramunas Lygaitis, Steponas Raisys, Karolis Kazlauskas, Gediminas Kreiza, Dmytro Volyniuk, Dalius Gudeika, Saulius Jursenas, Juozas V Grazulevicius
Seven new derivatives of phenanthro[9,10-d]imidazole having differenet substituents at the 1st and the 2nd positions of the phenanthroimidazole moiety were synthesized and characterized. The comparative study of their properties was performed employing thermal, optical, electrochemical and photoelectrical measurements. The properties of the newly synthesized compounds were compared with those of earlier reported derivatives of phenanthroimidazole and several interesting new findings were disclosed. Density functional theory calculations accompanied by optical spectroscopy measurements have shown the possibility of tuning the emission properties (excited-stated decay rate, fluorescence quantum yield, etc...
June 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28620343/international-differences-in-multiple-sclerosis-health-outcomes-and-associated-factors-in-a-cross-sectional-survey
#12
Grace D Reilly, Awng Shar Mahkawnghta, Pia L Jelinek, Alysha M De Livera, Tracey J Weiland, Chelsea R Brown, Keryn L Taylor, Sandra L Neate, George A Jelinek, Claudia H Marck
Multiple sclerosis (MS) is a major cause of disability and poor quality of life (QOL). Previous studies have shown differences in MS health outcomes between countries. This study aimed to examine the associations between international regions and health outcomes in people with MS. Self-reported data were taken from the Health Outcomes and Lifestyle In a Sample of people with Multiple Sclerosis online survey collected in 2012. The 2,401 participants from 37 countries were categorized into three regions: Australasia, Europe, and North America...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28617978/enantioselective-determination-of-r-manidipine-and-s-manidipine-in-human-plasma-by-a-sensitive-and-selective-chiral-lc-ms-ms-assay
#13
Vinayender Adireddy, Bhavani Prasanna Kumar Bimireddy, Venkateswarlu Ponneri
A sensitive and selective liquid chromatography-tandem mass spectrometric (LC-MS/MS) assay method has been developed and validated for the enantioselective determination of manidipine in human plasma using isotope labeled compounds as internal standards. After solid phase extraction, R-(-)-manidipine and S-(+)-manidipine were chromatographed on a Chiralpack IC-3 C18 column using a isocratic mobile phase composed of 2mM ammonium bicarbonate and acetonitrile (15:85, v/v). The precursor ion to product ion transitions for the enantiomers and internal standards were monitored in the multiple reaction monitoring and positive ionization mode using a API-4000 mass spectrometer...
June 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28616137/multi-stimuli-responsive-and-multi-functional-oligoaniline-modified-vitrimers
#14
Qiaomei Chen, Xiaowen Yu, Zhiqiang Pei, Yang Yang, Yen Wei, Yan Ji
Smart polymers have been playing indispensable roles in our lives. However, it is challenging to combine more than three stimuli-responses or functionalities into one polymer, not to mention integrating multi-stimuli responsivity and multi-functionality at the same time. Vitrimers, an emerging type of materials, are covalently crosslinked networks that can be reprocessed but are still infusible and insoluble. Herein, we show that simply introducing oligoaniline into a vitrimer results in a covalently crosslinked material that can respond to six different stimuli (heat, light, pH, voltage, metal ions and redox chemicals) and perform six functions (shape memory, welding, healing, recycling, electro-chromism and adsorption of metal ions)...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28609256/nano-metal-oxides-exposure-and-engineering-control-assessment
#15
Alberto Garcia, Adrienne Eastlake, Jennifer L Topmiller, Christopher Sparks, Kenneth Martinez, Charles L Geraci
In January 2007, the National Institute for Occupational Safety and Health (NIOSH) conducted a field study to evaluate process specific emissions during the production of ENMs. This study was performed using the nanoparticle emission assessment technique (NEAT). During this study, it was determined that ENMs were released during production and cleaning of the process reactor. Airborne concentrations of silver, nickel, and iron were found both in the employee's personal breathing zone and area samples during reactor cleaning...
June 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28608508/an-investigation-of-the-symmetric-and-asymmetric-cleavage-products-in-the-system-aluminum-trihalide-1-butylimidazole
#16
Michael Stephan Hog, Marius Schneider, Gauthier Studer, Monika Bäuerle, Steffen Albert Föhrenbacher, Harald Scherer, Ingo Krossing
We present the investigation of AlX3 (X = Cl, Br) based mixtures with the ligand 1-butylimidazole (BuIm) in various ratios. The mixtures were characterized by multinuclear (1H; 27Al; 13C and 15N) NMR, IR and Raman spectroscopy and in part by single crystal x-ray diffraction. Depending on the molar ratio x(AlBr3) of the AlBr3 based mixtures the cationic aluminum complexes [Al(BuIm)6]3+ and [AlBr2(BuIm)4]+, the neutral adduct AlBr3(BuIm) as well as the anions Br-, [AlBr4]- and [Al2Br7]- could be identified as the products of the symmetric and asymmetric cleavage of dimeric Al2Br6...
June 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28607973/role-of-electrochemically-in-house-synthesized-and-functionalized-graphene-nanofillers-in-the-structural-performance-of-epoxy-matrix-composites
#17
Sumanta Kumar Sahoo, Bankim Chandra Ray, Archana Mallik
The present study focuses on the intriguing enhancement in the mechanical properties of an epoxy-based composite structure resulting from the incorporation of in-house synthesized functionalized graphene nanosheets (f-GNSs) as nanofillers. The f-GNSs were obtained by anionic electrochemical intercalation and exfoliation with 2 M H2SO4, HClO4, and HNO3 protic electrolytes. The structural properties of the as-synthesized GNSs were analyzed by XRD and Raman spectroscopy. The (002) and (001) lattice planes of graphene and graphene oxide are observed at around 24...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28606537/enhanced-mechanical-properties-of-hydrothermal-carbamated-cellulose-nanocomposite-film-reinforced-with-graphene-oxide
#18
Sinyee Gan, Sarani Zakaria, Sharifah Nabihah Syed Jaafar
Cellulose carbamate (CC) was synthesized via hydrothermal process and mixed with graphene oxide (GO) to form a homogeneous cellulose matrix nanocomposite films. The properties of CC/GO nanocomposite films fabricated using simple solution-mixing method with different GO loadings were studied. Transmission electron microscope analysis showed the exfoliation of self-synthesized GO nanosheets within the CC matrix. X-ray diffraction results confirmed the crystalline structure of CC/GO films as the CC/GO mass ratio increased from 100/0 to 100/4...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28605199/effect-of-conformational-chiralty-on-optical-activity-observed-in-an-achiral-bent-core-molecule
#19
Yue Shi, Zeyong Sun, Ran Chen, Chenhui Zhu, Richard K Shoemaker, Ethan Tsai, David M Walba, Matthew A Glaser, Joseph E Maclennan, Dong Chen, Noel A Clark
Smectic layers of achiral, tilted bent-core liquid crystal molecules are chiral but their optical activity is generally small. Here, we study the effect of conformational chirality on optical activity in an achiral, bent-core mesogen, W513. The neat material has a modulated B4 phase, which appears dark under crossed polarizers and shows no observable optical rotation under decrossed polarizers. However, in mixtures of W513 with a rod-like mesogen, 8CB, distinct left- and right-handed chiral domains with opposite optical activity are observed...
June 12, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28603957/the-impact-of-nanomorphology-on-the-photochemistry-of-fullerene-films-correlating-stability-to-triplet-exciton-kinetics
#20
Emily M Speller, James D McGettrick, Beth Rice, Andrew M Telford, Harrison K H Lee, Ching-Hong Tan, Catherine S De Castro, Matthew Lloyd Davies, Trystan M Watson, Jenny Nelson, James R Durrant, Zhe Li, Wing Chung Tsoi
The photochemistry and stability of fullerene films is found to be strongly dependent upon film nanomorphology. In particular, PC61BM blend films, dispersed with polystyrene, are found to be more susceptible to photobleaching in air than the more aggregated neat films. This enhanced photobleaching correlated with increased oxygen quenching of PC61BM triplet states, and the appearance of a carbonyl FTIR absorption band indicative of fullerene oxidation. sug-gesting PC61BM photo-oxidation is primarily due to triplet-mediated singlet oxygen generation...
June 12, 2017: ACS Applied Materials & Interfaces
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