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https://www.readbyqxmd.com/read/28723698/application-technical-issues-and-interpretation-of-c1q-for-graft-outcome
#1
Dolly B Tyan
PURPOSE OF REVIEW: Significant interest and controversy surround the use of C1q for determining risk of antibody-mediated rejection (AMR) and graft loss. Alternate models for predicting outcomes have been proposed. This review focuses on the correlation of currently utilized assays for outcome, together with the technical and theoretical limitations, to distill current thinking. RECENT FINDINGS: Results demonstrate that C1q status is significantly correlated with AMR and graft loss...
July 18, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28722130/solubility-and-molecular-interactions-of-ferulic-acid-in-various-isopropanol%C3%A2-%C3%A2-water-mixtures
#2
Nazrul Haq, Nasir A Siddiqui, Faiyaz Shakeel
OBJECTIVE: The solubility of an herbal compound ferulic acid (FA) in various (isopropanol (IPA) + water) mixtures was measured and correlated at temperatures 'T = 298.2 K to 318.2 K' and pressure 'p = 0.1 MPa'. METHODS: The experimental solubilities of FA in mole fraction were determined using a static equilibrium method and correlated with 'Apelblat, Van't Hoff, Yalkowsky and Jouyban-Acree models'. KEY FINDINGS: The maximum mole fraction solubilities of FA were obtained in neat IPA (2...
July 19, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28722047/the-effect-of-hofmeister-anions-on-water-structure-at-protein-surfaces
#3
Euihyun Lee, Jun-Ho Choi, Minhaeng Cho
To understand the effects of specific ions on protein-water interactions and the thermodynamic stability of proteins in salt solutions, we use a molecular dynamics (MD) simulation to examine the water structure, orientational distribution, and dynamics near the surface of ubiquitin. In particular, we consider NaCl, NaBF4, NaSCN, and NaClO4 salt solutions containing ubiquitin, where the anions of the latter three salts are well-known chaotropic ions in the Hofmiester anion series. The number of hydrogen bonds (H-bonds) per water molecule is found to decrease significantly at the ubiquitin-water interface, indicating a significant disruption of the water H-bonding network...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28720514/ahrq-series-on-complex-intervention-systematic-reviews-paper-2-defining-complexity-formulating-scope-and-questions
#4
Michael P Kelly, Jane Noyes, Robert L Kane, Christine Chang, Stacey Uhl, Karen A Robinson, Stacey Springs, Mary E Butler, Jeanne-Marie Guise
BACKGROUND: The early stages of a systematic review set the scope and expectations. This can be particularly challenging for complex interventions given their multi-dimensional and dynamic nature. RATIONALE: This paper builds on concepts introduced in Paper 1 of this series. It describes the methodological, practical and philosophical challenges and potential approaches for formulating the questions and scope of systematic reviews of complex interventions. Further it discusses the use of theory to help organize reviews of complex interventions...
June 29, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28718216/one-compound-based-highly-efficient-deep-red-to-near-infrared-thermally-activated-delayed-fluorescence-organic-solid-films-and-electroluminescent-devices
#5
Yue Wang, Chenglong Li, Ruihong Duan, Baoyan Liang, Guangchao Han, Shipan Wang, Kaiqi Ye, Yu Liu, Yuanping Yi
The design and synthesis of highly efficient deep red (DR) and near-infrared (NIR) organic emitting materials with characteristic of thermally activated delayed fluorescence (TADF) still remains a great challenge. In this contribution, we developed a strategy to construct TADF organic solid films with strong DR or NIR emission feature. The triphenylamine (TPA) and quinoxaline-6,7-dicarbonitrile (QCN) were respectively employed as electron donor (D) and acceptor (A) to synthesize a TADF compound, TPA-QCN. The TPA-QCN molecule with orange-red emission in solution was employed as a dopant to prepare DR and NIR luminescent solid thin films...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28715218/a-universal-spectroscopic-map-for-the-oh-stretching-mode-in-alcohols
#6
Oluwaseun O Mesele, Ward H Thompson
Empirical maps are presented for the OH stretching vibrations in neat alcohols in which the relevant spectroscopic quantities are expressed in terms of the electric field exerted on the hydrogen atom by the surrounding liquid. It is found, by examination of the four lowest linear alcohols, methanol, ethanol, n-propanol, and n-butanol, that a single map can be used for alcohols with different alkyl groups. This "universal" map is in very good agreement with maps optimized for the individual alcohols, but differs from those previously developed for water...
July 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28715188/understanding-microscopic-behavior-of-the-mixture-of-ionic-liquid-ethylene-glycol-lithium-salt-through-time-resolved-fluorescence-nuclear-magnetic-resonance-nmr-and-electron-paramagnetic-resonance-epr-studies
#7
Ranu Satish Dhale, Prabhat Kumar Sahu, Moloy Sarkar
The present study has been undertaken with an aim to find out the suitability of a binary solvent system, comprising an ionic liquid, 1-(2-Hydroxyethyl)-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([OHEMIM][NTf2]) and ethylene glycol (EG), towards lithium ion battery applications. For this purpose, the behavior in terms of structure, intermolecular interaction and dynamics of several solvent systems, [OHEMIM][NTf2], [OHEMIM][NTf2]-LiNTf2(lithium bis(trifluoromethylsulfonyl)imide), [OHEMIM][NTf2]-EG and [OHEMIM][NTf2]-EG-LiNTf2 are investigated by carrying out steady state and time-resolved fluorescence, nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) measurements...
July 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28714119/high-performance-polymers-sandwiched-with-chemical-vapor-deposited-hexagonal-boron-nitrides-as-scalable-high-temperature-dielectric-materials
#8
Amin Azizi, Matthew R Gadinski, Qi Li, Mohammed Abu AlSaud, Jianjun Wang, Yi Wang, Bo Wang, Feihua Liu, Long-Qing Chen, Nasim Alem, Qing Wang
Polymer dielectrics are the preferred materials of choice for power electronics and pulsed power applications. However, their relatively low operating temperatures significantly limit their uses in harsh-environment energy storage devices, e.g., automobile and aerospace power systems. Herein, hexagonal boron nitride (h-BN) films are prepared from chemical vapor deposition (CVD) and readily transferred onto polyetherimide (PEI) films. Greatly improved performance in terms of discharged energy density and charge-discharge efficiency is achieved in the PEI sandwiched with CVD-grown h-BN films at elevated temperatures when compared to neat PEI films and other high-temperature polymer and nanocomposite dielectrics...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28711833/assessment-of-nanoparticles-release-into-the-environment-during-drilling-of-carbon-nanotubes-epoxy-and-carbon-nanofibres-epoxy-nanocomposites
#9
Kristof Starost, Evelien Frijns, Jo Van Laer, Nadimul Faisal, Ainhoa Egizabal, Cristina Elizextea, Maria Blazquez, Inge Nelissen, James Njuguna
The risk assessment, exposure and understanding of the release of embedded carbon nanotubes (CNTs) and carbon nanofibers (CNFs) from commercial high performance composites during machining processes are yet to be fully evaluated and quantified. In this study, CNTs and CNFs were dispersed in epoxy matrix through calendaring process to form nanocomposites. The automated drilling was carried out in a specially designed drilling chamber that allowed elimination of background noise from the measurements. Emission measurements were taken using condensed particle counter (CPC), scanning mobility particle sizer (SMPS) and DMS50 Fast Particulate Size Spectrometer...
June 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28711781/the-nature-of-hydrogen-bonding-interactions-in-nonsteroidal-anti-inflammatory-drugs-revealed-by-polarized-ir-spectroscopy
#10
Barbara Hachuła
The influence of hydrogen-bonding interactions in the solid phase on the IR spectroscopic pattern of the νOH band of nonsteroidal anti-inflammatory drugs (NSAIDs) was studied experimentally by IR spectroscopy with the use of polarized light at two temperatures (293K and 77K) and in isotopic dilution. The neat and deuterated crystals of (S)-naproxen ((S)-NPX), (R)-flurbiprofen ((R)-FBP), (RS)-flurbiprofen ((RS)-FBP) and (RS)-ketoprofen ((RS)-KTP) were obtained by melt crystallization between the two squeezed CaF2 plates...
July 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28704578/large-diameter-tio2-nanotubes-enable-wall-engineering-with-conformal-hierarchical-decoration-and-blocking-layers-for-enhanced-efficiency-in-dye-sensitized-solar-cells
#11
Patrik Schmuki, A H El-Zarka, Ning Liu, Imgon Hwang, Mustafa Kamal
In the present work we grow anodic TiO2 nanotube layer with a tube diameter > 500 nm and an open tube mouth. We use this morphology in dye-sensitized solar cells (DSSCs) and show that these tubes allow the construction of hybrid hierarchical photoanode structures of nanotubes with a defined and wall-conformal TiO2 nanoparticle decoration. At the same time, the large diameter allows the successful establishment of an additional (insulating) blocking layer of SiO2 or Al2O3 on the tube wall. We show that this combination of hierarchical structure and blocking layer significantly enhances the solar cell efficiency by suppressing recombination reactions...
July 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28702673/unexpected-thermal-annealing-effects-on-the-viscosity-of-polymer-nanocomposites
#12
Fei Chen, Koshu Takatsuji, Dan Zhao, Xuanji Yu, Sanat K Kumar, Ophelia K C Tsui
The effects of thermal annealing, 12-50 K above the glass transition temperature, on the zero-shear viscosity, η, of polymer nanocomposites (PNCs) and the corresponding host polymers were studied. For all specimens, including neat and 4 wt% dioctyl phthalate (DOP)-plasticized polystyrene (PS), neat poly(methyl methacrylate) (PMMA), and PNCs containing bare and grafted silica nanoparticles in neat and DOP-plasticized PS, the η increased with time initially, and only asymptotically approached a steady-state value after thermal annealing for ∼100 to ∼200 h...
July 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28702657/dissolution-of-anionic-surfactant-mesophases
#13
Andreas S Poulos, Christopher S Jones, João T Cabral
Linear and circular solvent penetration experiments are used to study the dissolution of anionic SLE3S surfactant mesophases in water. We show that a lamellar (Lα) phase in contact with water will transit through a series of cubic, hexagonal, and micellar phase bands with sharp interfaces identified from their optical textures. In both linear and circular geometries, the kinetics of front propagation and eventual dissolution are well described by diffusive penetration of water, and a simple model applies to both geometries, with a different effective diffusion coefficient for water Df as the only fitting parameter...
July 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28697843/uriswab-an-effective-transport-medium-for-nucleic-acid-detection-of-chlamydia-trachomatis-mycoplasma-genitalium-and-neisseria-gonorrhoeae
#14
Anna-Maria G Costa, Suzanne M Garland, Rebecca Guy, Handan Wand, Sepehr N Tabrizi
Background: Patient self-sampling allows for remote collection and return to clinic or laboratory by post. Urine samples, although convenient, are challenging to post. This study evaluated UriSwab (Copan, Brescia, Italy) as a collection and transport vessel for Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG) and Mycoplasma genitalium (MG) detection by polymerase chain reaction, compared with flocked swab and neat urine. Methods: Five replicates of each specimen type were prepared from previously characterised urine samples (n=330), stored at room temperature (RT) or 37°C, then extracted on day 1, 3, 7, 10 and 16 (VERSANT kPCR Sample Prep System, Siemens, Munich, Germany)...
July 12, 2017: Sexual Health
https://www.readbyqxmd.com/read/28697414/analytical-methodologies-for-broad-metabolite-coverage-of-exhaled-breath-condensate
#15
Alexander A Aksenov, Konstantin O Zamuruyev, Alberto Pasamontes, Joshua F Brown, Michael Schivo, Soraya Foutouhi, Bart C Weimer, Nicholas J Kenyon, Cristina E Davis
Breath analysis has been gaining popularity as a non-invasive technique that is amenable to a broad range of medical uses. One of the persistent problems hampering the wide application of the breath analysis method is measurement variability of metabolite abundances stemming from differences in both sampling and analysis methodologies used in various studies. Mass spectrometry has been a method of choice for comprehensive metabolomic analysis. For the first time in the present study, we juxtapose the most commonly employed mass spectrometry-based analysis methodologies and directly compare the resultant coverages of detected compounds in exhaled breath condensate in order to guide methodology choices for exhaled breath condensate analysis studies...
June 27, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28696717/ligand-accelerated-gold-catalyzed-addition-of-in-situ-generated-hydrazoic-acid-to-alkynes-under-neat-conditions
#16
Xiaoqing Li, Shengrong Liao, Zhixun Wang, Liming Zhang
The direct addition of in situ generated hydrazoic acid to alkynes is realized without solvent by using a gold catalyst derived from a recently designed remotely functionalized biaryl-2-ylphosphine ligand (i.e., WangPhos). With terminal alkynes, the additions are mostly realized with 0.1 mol% catalyst loadings and at 40 °C. With more challenging internal alkynes devoid of direct EWG substitution, the one-step transformation is realized for the first time with generally high efficiency at ambient temperature...
July 11, 2017: Organic Letters
https://www.readbyqxmd.com/read/28695198/neat-monolayer-tiling-of-molecularly-thin-two-dimensional-materials-in-1-min
#17
Kazuaki Matsuba, Chengxiang Wang, Kazuko Saruwatari, Yusuke Uesusuki, Kosho Akatsuka, Minoru Osada, Yasuo Ebina, Renzhi Ma, Takayoshi Sasaki
Controlled arrangement of molecularly thin two-dimensional (2D) materials on a substrate, particularly into precisely organized mono- and multilayer structures, is a key to design a nanodevice using their unique and enhanced physical properties. Several techniques such as mechanical transfer process and Langmuir-Blodgett deposition have been applied for this purpose, but they have severe restrictions for large-scale practical applications, for example, limited processable area and long fabrication time, requiring skilled multistep operations...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28692796/atorvastatin-as-a-promising-crystallization-inhibitor-of-amorphous-probucol-dielectric-studies-at-ambient-and-elevated-pressure
#18
Justyna Knapik-Kowalczuk, Zaneta Wojnarowska, Marzena Rams-Baron, Karolina Jurkiewicz, Judyta Cielecka-Piontek, Kia L Ngai, Marian Paluch
The aim of this article was to check the physical stability of the amorphous form of probucol at both standard storage and manufacturing conditions. Our studies clearly show that disordered form of the examined, cholesterol lowering, agent stored at ambient pressure do not reveal any tendency toward recrystallization. The physical stability of neat probucol stored at ambient pressure have been investigated (i) at room temperature by means of X-ray diffraction technique (XRD) as well as (ii) at T = 333 K by means of broadband dielectric spectroscopy (BDS)...
July 10, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28691386/reduced-and-surface-modified-graphene-oxide-with-nonlinear-resistivity
#19
Martin Wåhlander, Fritjof Nilsson, Richard L Andersson, Anna Carlmark, Henrik Hillborg, Eva Malmström
Field-grading materials (FGMs) are used to reduce the probability for electrical breakdowns in critical regions of electrical components and are therefore of great importance. Usually, FGMs are heavily filled (40 vol.%) with semi-conducting or conducting particles. Here, polymer-grafted reduced graphene oxide (rGO) is used as a filler to accomplish percolated networks at very low filling ratios (<2 vol.%) in a semi-crystalline polymer matrix: poly(ethylene-co-butyl acrylate) (EBA). Various simulation models are used to predict the percolation threshold and the flake-to-flake distances, to complement the experimental results...
July 10, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28690968/miniemulsion-copolymerization-of-meth-acrylates-in-the-presence-of-functionalized-multiwalled-carbon-nanotubes-for-reinforced-coating-applications
#20
Bertha T Pérez-Martínez, Lorena Farías-Cepeda, Víctor M Ovando-Medina, José M Asua, Lucero Rosales-Marines, Radmila Tomovska
Film forming, stable hybrid latexes made of methyl metacrylate (MMA), butyl acrylate (BA) and 2-hydroxyethyl methacrylate (HEMA) copolymer reinforced with modified multiwalled carbon nanotubes (MWCNTs) were synthesized by in situ miniemulsion polymerization. The MWCNTs were pretreated by an air sonication process and stabilized by polyvinylpyrrolidone. The presence of the MWCNTs had no significant effect on the polymerization kinetics, but strongly affected the polymer characteristics (Tg and insoluble polymer fraction)...
2017: Beilstein Journal of Nanotechnology
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