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https://www.readbyqxmd.com/read/28936768/untrapping-kinetically-trapped-ions-the-role-of-water-vapor-and-ion-source-activation-conditions-on-the-gas-phase-protomer-ratio-of-benzocaine-revealed-by-ion-mobility-mass-spectrometry
#1
Hanxue Xia, Athula B Attygalle
The role of water vapor in transforming the thermodynamically preferred species of protonated benzocaine to the less favored protomer was investigated using helium-plasma ionization (HePI) in conjunction with ion-mobility mass spectrometry (IM-MS). The IM arrival-time distribution (ATD) recorded from a neat benzocaine sample desorbed to the gas phase by a stream of dry nitrogen and ionized by HePI showed essentially one peak for the O-protonated species. However, when water vapor was introduced to the enclosed ion source, within a span of about 150 ms the ATD profile changed completely to one dominated by the N-protonated species...
September 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28933552/a-metal-and-solvent-free-approach-to-diversely-substituted-picolinates-via-domino-reaction-of-cyclic-sulfamidate-imines-with-%C3%AE-%C3%AE-unsaturated-%C3%AE-ketocarbonyls
#2
Soumen Biswas, Debashis Majee, Soumitra Guin, Sampak Samanta
An efficient, solvent-free and eco-friendly domino reaction of 5/6-membered cyclic sulfamidate imines with a variety of β,γ-unsaturated α-ketocarbonyls in a neat condition under MW irradiation promoted by DABCO as a solid organobase has been developed for the rapid construction of a novel class of densely functionalized picolinates. This interesting metal-solvent-free tactic allows allows a wide range of useful functionalities on the aryl rings and delivers good to excellent yields of the aforesaid aza-heterocycles within short span of times (20-40 min)...
September 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28932886/immediate-responses-of-the-cockroach-blaptica-dubia-after-the-exposure-to-sulfur-mustard
#3
Tanja Popp, Robin Lüling, Ingrid Boekhoff, Thomas Seeger, Francisco Branoner, Thomas Gudermann, Horst Thiermann, Franz Worek, Dirk Steinritz
The chemical agent sulfur mustard (SM) causes erythema, skin blisters, ulcerations, and delayed wound healing. It is accepted that the underlying molecular toxicology is based on DNA alkylation. With an expected delay, DNA damage causes impairment of protein biosynthesis and disturbance of cell division. However, using the cockroach model Blaptica dubia, the presented results show that alkylating compounds provoke immediate behavior responses along with fast changes in the electrical field potential (EFP) of neurons, suggesting that lesions of DNA are probably not the only effect of alkylating compounds...
September 20, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28930353/interplay-between-bulk-self-assembly-interfacial-and-foaming-properties-in-a-catanionic-surfactant-mixture-of-varying-composition
#4
José Ferreira, Alesya Mikhailovskaya, Alexis Chenneviere, Frédéric Restagno, Fabrice Cousin, François Muller, Jéril Degrouard, Anniina Salonen, Eduardo F Marques
The self-aggregation, surface properties and foamability of the catanionic surfactant mixture cetyltrimethylammonium bromide (CTAB)/sodium octyl sulfonate (SOSo) have been investigated to obtain insight on the relation between bulk nanostructures, surfactant packing, and foam stability and aging. Light microscopy, SANS, cryo-TEM, DLS, surface tension, rheometry and direct photography were used to characterize mixtures with varying CTAB molar fraction, xCTAB. In the bulk, self-assembly is richer in the excess CTAB region than in the excess SOSo one...
September 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28928713/pain-in-people-with-multiple-sclerosis-associations-with-modifiable-lifestyle-factors-fatigue-depression-anxiety-and-mental-health-quality-of-life
#5
Claudia H Marck, Alysha M De Livera, Tracey J Weiland, Pia L Jelinek, Sandra L Neate, Chelsea R Brown, Keryn L Taylor, Fary Khan, George A Jelinek
BACKGROUND: People with multiple sclerosis (MS) often experience pain, which can interfere with mobility, employment, and quality of life (QOL). METHODS: This cross-sectional study explored associations between pain, demographic, disease, and modifiable lifestyle factors in an international sample of people with MS recruited online. RESULTS: Substantial pain, of moderate/severe intensity and interfering at least moderately with work/household or enjoyment of life in the past 4 weeks, was reported by 682/2,362 (28...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28928477/a-generic-method-to-synthesise-graphitic-carbon-coated-nanoparticles-in-large-scale-and-their-derivative-polymer-nanocomposites
#6
Nannan Wang, Zhuxian Yang, Fang Xu, Kunyapat Thummavichai, Hongmei Chen, Yongde Xia, Yanqiu Zhu
A versatile Rotary Chemical Vapour Deposition (RCVD) technique for the in-situ synthesis of large scale carbon-coated non-magnetic metal oxide nanoparticles (NPs) is presented, and a controllable coating thickness varying between 1-5 nm has been achieved. The technique has significantly up-scaled the traditional chemical vapour deposition (CVD) production for NPs from mg level to 10 s of grams per batch, with the potential for continuous manufacturing. The resulting smooth and uniform C-coatings sheathing the inner core metal oxide NPs are made of well-crystallised graphitic layers, as confirmed by electron microscopy imaging, electron dispersive spectrum elemental line scan, X-ray powder diffractions and Raman spectroscopy...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28925951/transparent-pullulan-mica-nanocomposite-coatings-with-outstanding-oxygen-barrier-properties
#7
Ilke Uysal Unalan, Derya Boyacı, Silvia Trabattoni, Silvia Tavazzi, Stefano Farris
This study presents a new bionanocomposite coating on poly(ethylene terephthalate) (PET) made of pullulan and synthetic mica. Mica nanolayers have a very high aspect ratio (α), at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mica (0.02 wt %, which is ϕ ≈ 0.00008) in pullulan coatings dramatically improved the oxygen barrier performance of the nanocomposite films under dry conditions, however, this performance was partly lost as the environmental relative humidity (RH) increased...
September 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28923418/active-modulation-in-neat-carbon-dioxide-packed-column-comprehensive-two-dimensional-supercritical-fluid-chromatography
#8
Orjen Petkovic, Pierre Guibal, Patrick Sassiat, Jérôme Vial, Didier Thiébaut
After demonstrating in a first paper the feasibility of SFCxSFC without decompression of the mobile phase, a modified interface has been developed in order to perform active modulation between the two SFC dimensions. In this paper, it is shown that the new interface enabled independent control of modulation parameters in SFCxSFC and performed a band compression effect of solutes between the two SFC dimensions. The effectiveness of this new modulation process was studied using a Design of Experiments. The SFCxSFC prototype was applied to the analysis of a real oil sample to demonstrate the benefits of the active modulator; in comparison to our previous results obtained without active modulation, better separation was obtained with the new interface owing to the peak compression occurring in the modulator...
August 26, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28920429/hybrid-mos2-h-bn-nanofillers-as-synergic-heat-dissipation-and-reinforcement-additives-in-epoxy-nanocomposites
#9
Helio Ribeiro, João Paulo Campos Trigueiro, Wellington M Silva, Cristiano F Woellner, Peter Samora Owuor, Alin Cristian Chipara, Magnovaldo Carvalho Lopes, Chandra Sekhar Tiwary, Jairo José Pedrotti, Rodrigo Villegas Salvatierra, James M Tour, Nitin Chopra, Ihab N Odeh, Glaura Silva, Pulickel M Ajayan
Two-dimensional (2D) nanomaterials as molybdenum disulfide (MoS2), hexagonal boron nitride (h-BN), and the hybrid (MoS2/h-BN) were employed as fillers to improve the physical properties of epoxy composites. Nanocomposites were produced in different concentrations and studied in their microstructure, mechanical and thermal properties. The hybrid 2D mixture imparted efficient reinforcement to the epoxy leading to increases of up to 95% in tensile strength, 60% in ultimate strain and 58% in Young's modulus. Moreover, an enhancement of 203% in thermal conductivity was achieved for the hybrid composite as compared to neat polymer...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920121/room-temperature-cu-catalyzed-n-arylation-of-aliphatic-amines-in-neat-water
#10
Deping Wang, Yanwen Zheng, Min Yang, Fuxing Zhang, Fangfang Mao, Jiangxi Yu, Xiaohong Xia
A room-temperature and PTC-free copper-catalyzed N-arylation of aliphatic amines in neat water has been developed. Using a combination of CuI and 6,7-dihydroquinolin-8(5H)-one oxime as the catalyst and KOH as the base, a wide range of aliphatic amines are arylated with various aryl and heteroaryl halides to give the corresponding products in up to 95% yield.
September 18, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28917921/effect-of-oxidized-chitin-nanocrystals-isolated-by-ammonium-persulfate-method-on-the-properties-of-carboxymethyl-cellulose-based-films
#11
Ahmed A Oun, Jong-Whan Rhim
Oxidized chitin nanocrystals (ChNCs) were isolated from crab shell chitin using ammonium persulfate (APS) method. The oxidized ChNCs were in needle shape with a diameter of 15nm, the length of 400-500nm, and crystallinity index of 93.5%. Carboxymethyl cellulose (CMC)-based films reinforced with the ChNCs (0, 1, 5, and 10wt.%) were flexible and transparent. The mechanical strength of the CMC film increased significantly (p<0.05) after blending with the ChNCs. The tensile strength (TS) and elastic modulus (EM) increased by 88% and 243% when 10wt...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28915058/valorization-of-unconventional-lipids-from-microalgae-or-tall-oil-via-a-selective-dual-catalysis-one-pot-approach
#12
Sandra K Hess, Natalie S Schunck, Verena Goldbach, Daniela Ewe, Peter G Kroth, Stefan Mecking
A dual catalysis approach enables selective functionalization of unconventional feedstocks composed of complex fatty acid mixtures with highly unsaturated portions like eicosapentaenoate (20:5) along with monounsaturated compounds. The degree of unsaturation is unified by selective heterogeneous hydrogenation on Pd/γ-Al2O3, complemented by effective activation to a homogeneous carbonylation catalyst [(dtbpx)PdH(L)](+) by addition of diprotonated diphosphine (dtbpxH2)(OTf)2. By this one-pot approach, neat 20:5 as a model substrate is hydrogenated to up to 80% to the monounsaturated analogue (20:1), this is functionalized to the desired C21 α,ω-diester building block with a linear selectivity of over 90%...
September 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28914543/modified-conducting-polymer-hole-injection-layer-for-high-efficiency-perovskite-light-emitting-devices-enhanced-hole-injection-and-reduced-luminescence-quenching
#13
Xue-Feng Peng, Xiao-Yan Wu, Xia-Xia Ji, Jie Ren, Qi Wang, Guo-Qing Li, Xiao-Hui Yang
Modification of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with sodium-poly(styrenesulfonate) leads to a ca. 0.3 eV increase in the work function and 15 times enhancement in the photoluminescence intensity of the overlying perovskite layer, which is closely correlated with the formation of a highly PSS-enriched top layer. As a direct result, the hybrid halide perovskite light-emitting devices with a modified PEDOT:PSS layer show the maximum external quantum efficiency of 7.2% and power efficiency of 19...
September 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28914466/supramolecular-hydro-and-ionogels-a-study-of-their-properties-and-antibacterial-activity
#14
Carla Rizzo, Rossella Arrigo, Nadka Tz Dintcheva, Giuseppe Gallo, Francesco Giannici, Renato Noto, Alberto Sutera, Paola Vitale, Francesca D'Anna
Diimidazolium-based organic salts, bearing peptides or aminoacids as anions, have been synthesized and tested for their gelling ability in biocompatible solvents. These low molecular weight salts were successfully used as gelators in phosphate saline buffer and ionic liquids. Then, properties of obtained soft materials were analyzed in terms of melting temperature and gel strength as accounted for by rheological investigation. Gel phase formation was studied using UV-vis and resonance light scattering measurements, whereas morphology of soft materials was analysed using polarized optical microscopy and scanning electron microscopy...
September 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28913578/loci-on-chromosomes-1a-and-2a-affect-resistance-to-tan-yellow-spot-in-wheat-populations-not-segregating-for-tsn1
#15
Manisha Shankar, Dorthe Jorgensen, Julian Taylor, Ken J Chalmers, Rebecca Fox, Grant J Hollaway, Stephen M Neate, Mark S McLean, Elysia Vassos, Hossein Golzar, Robert Loughman, Diane E Mather
QTL for tan spot resistance were mapped on wheat chromosomes 1A and 2A. Lines were developed with resistance alleles at these loci and at the tsn1 locus on chromosome 5B. These lines expressed significantly higher resistance than the parent with tsn1 only. Tan spot (syn. yellow spot and yellow leaf spot) caused by Pyrenophora tritici-repentis is an important foliar disease of wheat in Australia. Few resistance genes have been mapped in Australian germplasm and only one, known as tsn1 located on chromosome 5B, is known in Australian breeding programs...
September 14, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28905154/affordable-self-regulating-irrigation-device-for-microsurgery-using-readily-available-malleable-wire-and-a-silastic-tube-a-technical-note
#16
Yeongu Chung, Sung Ho Lee, Jiwook Ryu, Jun Ho Lee, Seok Keun Choi
BACKGROUND: A relevant irrigating and flushing maneuver during cerebral microsurgical procedures allows for a neat and optimal operative field. However, when operating on the deep region of the brain, a delicately created slim surgical corridor could unintentionally hinder the assisting surgeon from properly performing this routine maneuver. METHOD: To address this problem, the authors devised a useful and convenient irrigation system that can be used during cerebral microsurgery...
September 13, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28898103/a-comparative-study-of-secondary-structure-and-interactions-of-the-r5-peptide-in-silicon-oxide-and-titanium-oxide-co-precipitates-using-solid-state-nmr-spectroscopy
#17
Erika L Buckle, Adrienne Roehrich, Branden Vandermoon, Gary P Drobny
A biomimetic, peptide-mediated approach to inorganic nanostructure formation is of great interest as an alternative to industrial production methods. To investigate the role of peptide structure on silica (SiO2) and titania (TiO2) morphologies, we use the R5 peptide domain derived from the silaffin protein to produce uniform SiO2 and TiO2 nanostructures from the precursor silicic acid and titanium bis(ammonium lactato)dihydroxide, respectively. The resulting biosilica and biotitania nanostructures are characterized using scanning electron microscopy...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28891231/development-and-characterization-of-electrosprayed-nanoparticles-for-encapsulation-of-curcumin
#18
Zahra Esmaili, Samaneh Bayrami, Farid Abedin Dorkoosh, Hamid Akbari Javar, Ehsan Seyedjafari, Seyed Shahrooz Zargarian, Vahid Haddadi-Asl
Curcumin has been proven to be an effective herbal derived anti-inflammatory and antioxidant biocompatible agent. In this research PLGA (as a biocompatible and GRAS polymer) nanoparticles containing Curcumin were electrospryed from different polymeric solutions with different concentrations for the first time. Morphology of these nanoparticles in the absence/presence of Curcumin was evaluated by SEM, TEM and XPS analyses. Perfectly shaped nanoparticles with an average size of 300 and 320 nanometers were observed for neat and Curcumin loaded PLGA, respectively...
September 11, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28891164/heparin-or-bivalirudin-for-non-primary-pci-beware-of-neat-and-simple-answers%C3%A2
#19
EDITORIAL
Efthymios N Deliargyris, Carey Kimmelstiel
The debate regarding the choice of heparin or bivalirudin as the preferred anticoagulant in PCI is still ongoing Nonrandomized registry data are severely limited for comparative analyses and should therefore always be interpreted with caution Clinicians should resist simplistic data interpretations or populist cries relating to cost, but rather focus on valid benefit:risk analyses for their clinical decision making.
September 1, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28884848/perfluoroalkyltricyanoborate-and-perfluoroalkylcyanofluoroborate-anions-building-blocks-for-low-viscosity-ionic-liquids
#20
Johannes Landmann, Jan A P Sprenger, Philipp T Hennig, Rüdiger Bertermann, Matthias Grüne, Frank Würthner, Nikolai V Ignat'ev, Maik Finze
Potassium perfluoroalkyltricyanoborates K[CnF2n+1B(CN)3] (n = 1 (1d), 2 (2d)) and potassium mono(perfluoroalkyl)cyanofluoroborates K[CnF2n+1BF(CN)2] (n = 1 (1c), 2 (2c)) and [CnF2n+1BF2(CN)]- (n = 1 (1b), 2 (2b), 3 (3b), 4 (4b)) are accessible with perfect selectivities on multi-gram scales starting from K[CnF2n+1BF3] and Me3SiCN. The K+ salts are starting materials for the preparation of salts with organic cations, e.g. [EMIm]+ (EMIm = 1-ethyl-3-methylimidazolium). These [EMIm]+ salts are hydrophobic room temperature ionic liquids (RTILs) that are thermally, chemically, and electrochemically very robust, offering electrochemical windows of up to 5...
September 8, 2017: Chemistry: a European Journal
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