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https://www.readbyqxmd.com/read/28821140/the-potential-of-cashew-gum-functionalization-as-building-blocks-for-layer-by-layer-films
#1
Álvaro J Leite, Rui R Costa, Ana M S Costa, Jeanny S Maciel, José F G Costa, Regina C M de Paula, João F Mano
Cashew gum (CG), an exudate polysaccharide from Anacardium occidentale trees, was carboxymethylated (CGCm) and oxidized (CGO). These derivatives were characterized by FTIR and zeta potential measurements confirming the success of carboxymethylation and oxidation reactions. Nanostructured multilayered films were then produced through layer-by-layer (LbL) assembly in conjugation with chitosan via electrostatic interactions or Schiff bases covalent bonds. The films were analyzed by QCM-D and AFM. CG functionalization increased the film thickness, with the highest thickness being achieved for the lowest oxidation degree...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821116/active-release-coating-of-multilayer-assembled-branched-and-ionic-%C3%AE-cyclodextrins-onto-poly-ethylene-terephthalate
#2
Leyre Pérez-Álvarez, Leire Ruiz-Rubio, Erlantz Lizundia, Estíbaliz Hernáez, Luis M León, Jose Luis Vilas-Vilela
Branched ionic cyclodextrins multilayers were assembled onto the surface of previously aminolyzed poly(ethylene terephthalate) in order to construct local drug delivery tailored platforms with potential applicability as materials for indwelling medical devices. The construction of the multilayers took place by the alternate deposition of ionic cyclodextrin derivatives and was characterized by surface zeta-potential measurements, X-ray photoelectron spectroscopy and, after fluorescent labeling of anionic branched cyclodextrins, by UV-vis spectroscopy and confocal fluorescence spectroscopy...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821083/vapor-sensing-with-color-tunable-multilayered-coatings-of-cellulose-nanocrystals
#3
Yu Zhao, Guizhi Gao, Dagang Liu, Donglin Tian, Yinyan Zhu, Yu Chang
Colloidal cellulose nanocrystals were LBL deposited to form firmly-stacked optical coatings in which the nanorods regulated their head-to-tail association and aligned in the axial-centrifuged direction. The periodically transition from blue to orange of reflected colors was tunable via deposition layer adjustment. While the sensing coating was exposed to vapors of NH3(.)H2O, H2O, HCl and HAc, respectively, the color variation in the response process was irreversible at room temperature and highly dependent on vapor diffusion and chemical interface interaction...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820482/in-situ-synthesis-of-silver-nanoparticles-on-the-polyelectrolyte-coated-sericin-pva-film-for-enhanced-antibacterial-application
#4
Rui Cai, Gang Tao, Huawei He, Pengchao Guo, Meirong Yang, Chaoxiang Ding, Hua Zuo, Lingyan Wang, Ping Zhao, Yejing Wang
To develop silk sericin (SS) as a potential antibacterial biomaterial, a novel composite of polyelectrolyte multilayers (PEMs) coated sericin/poly(vinyl alcohol) (SS/PVA) film modified with silver nanoparticles (AgNPs) has been developed using a layer-by-layer assembly technique and ultraviolet-assisted AgNPs synthesis method. Ag ions were enriched by PEMs via the electrostatic attraction between Ag ions and PEMs, and then reduced to AgNPs in situ with the assistance of ultraviolet irradiation. PEMs facilitated the high-density growth of AgNPs and protected the synthesized AgNPs due to the formation of a 3D matrix, and thus endowed SS/PVA film with highly effective and durable antibacterial activity...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28820248/modulating-wettability-of-layered-materials-by-controlling-ligand-polar-headgroup-dynamics
#5
Terry A Villarreal, Shane R Russell, Jae Jin Bang, Justin K Patterson, Shelley A Claridge
Integrating functionalized 2D materials into multilayer device architectures increasingly requires understanding the behavior of noncovalently adsorbed ligands during solution processing. Here, we demonstrate that the headgroup dynamics of polymerized monolayers of functional alkanes can be controlled to modify surface wetting and environmental interactions. We find that headgroup dynamics are sensitive to the position of the polymerizable diyne group; thus, the polymerization process, typically used to stabilize the noncovalent monolayer, can also be used to selectively destabilize chain-chain interactions near the headgroups, making the headgroups more solvent-accessible and increasing surface hydrophilicity...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28819979/the-influence-of-a-novel-dimeric-ceramide-molecule-on-the-nanostructure-and-the-thermotropic-phase-behavior-of-a-stratum-corneum-model-mixture
#6
Sören Stahlberg, Adina Eichner, Stefan Sonnenberger, Andrej Kovacik, Stefan Lange, Thomas Schmitt, Bruno Demé, Thomas Hauss, Bodo Dobner, Reinhard H H Neubert, Daniel Huster
The stratum corneum (SC) is the outermost layer of the skin and composed of a multilayered assembly of mostly ceramids (Cer), free fatty acids, cholesterol (Chol), and cholesterol sulphate (Chol-S). Due to the tight packing of these lipids, the SC features unique barrier properties defending the skin from environmental influences. Under pathological conditions, where the skin barrier function is compromised, topical application of molecules that rigidify the SC may lead to a restored barrier function. To this end, molecules are required that incorporate into the SC and bring back the original rigidity of the skin barrier...
August 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28819758/an-in-silico-biomechanical-analysis-of-the-stent-esophagus-interaction
#7
Mathias Peirlinck, Nic Debusschere, Francesco Iannaccone, Peter D Siersema, Benedict Verhegghe, Patrick Segers, Matthieu De Beule
Despite all technological innovations in esophageal stent design over the past 20 years, the association between the stent design's mechanical behavior and its effect on the clinical outcome has not yet been thoroughly explored. A parametric numerical model of a commercially available esophageal bioresorbable polymeric braided wire stent is set up, accounting for stent design aspects such as braiding angle, strut material, wire thickness, degradation and friction between the wires comprising a predictive tool on the device's mechanical behavior...
August 17, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28819192/scalable-fabrication-of-the-graphitic-substrates-for-graphene-enhanced-raman-spectroscopy
#8
Tommi Kaplas, Antti Matikainen, Tarmo Nuutinen, Sari Suvanto, Pasi Vahimaa, Yuri Svirko
We propose direct synthesis of ultra-thin graphitic films on a dielectric substrate using sacrificial Ni catalyst layer, which significantly increases the crystallinity of the photoresist pyrolyzed at the temperature of 800 °C and above. A considerable amount of multilayer graphene in the photoresist film pyrolyzed in the presence of the Ni catalyst gives rise to an enhancement of the Raman signal of dye Sudan III molecules deposited on the substrate. We demonstrate comparable enhancement of the Raman signal from Sudan III molecules deposited on the fabricated graphitic substrate and those deposited on graphene, which was conventionally transferred to the silica substrate...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817090/insights-on-the-optical-properties-of-poly-3-4-ethylenedioxythiophene-poly-styrenesulfonate-formulations-by-optical-metrology
#9
Argiris Laskarakis, Varvara Karagkiozaki, Despoina Georgiou, Christoforos Gravalidis, Stergios Logothetidis
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is among the most widely used polymers that are used as printed transparent electrodes for flexible Organic Electronic (OE) devices, such as Organic Photovoltaics (OPVs). The understanding of their optical properties and the correlation of the optical properties with their electronic properties and metallic-like behavior can lead to the optimization of their functionality as transparent electrodes in multilayer OE device architectures. In this work, we study the optical properties of different PEDOT:PSS formulations by non-destructive Spectroscopic Ellipsometry (SE), from the infrared to the far ultraviolet spectral regions...
August 17, 2017: Materials
https://www.readbyqxmd.com/read/28817084/permalloy-based-thin-film-structures-magnetic-properties-and-the-giant-magnetoimpedance-effect-in-the-temperature-range-important-for-biomedical-applications
#10
Anna A Chlenova, Alexey A Moiseev, Mikhail S Derevyanko, Aleksandr V Semirov, Vladimir N Lepalovsky, Galina V Kurlyandskaya
Permalloy-based thin film structures are excellent materials for sensor applications. Temperature dependencies of the magnetic properties and giant magneto-impedance (GMI) were studied for Fe19Ni81-based multilayered structures obtained by the ion-plasma sputtering technique. Selected temperature interval of 25 °C to 50 °C corresponds to the temperature range of functionality of many devices, including magnetic biosensors. A (Cu/FeNi)₅/Cu/(Cu/FeNi)₅ multilayered structure with well-defined traverse magnetic anisotropy showed an increase in the GMI ratio for the total impedance and its real part with temperature increased...
August 17, 2017: Sensors
https://www.readbyqxmd.com/read/28816438/interfacial-mechanisms-of-water-vapor-sorption-into-cellulose-nanofibril-films-as-revealed-by-quantitative-models
#11
Minna Hakalahti, Marco Faustini, Cédric Boissière, Eero Kontturi, Tekla Tammelin
Humidity is an efficient instrument for facilitating changes in local architectures of 2-dimensional surfaces assembled from nanoscaled biomaterials. Here, complementary surface-sensitive methods are used to collect explicit and precise experimental evidence on the water vapor sorption into (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidized cellulose nanofibril (CNF) thin film over the relative humidity (RH) range from 0 to 97%. Changes in thickness and mass of the film due to water vapor uptake are tracked using Spectroscopic Ellipsometry and Quartz Crystal Microbalance with Dissipation monitoring, respectively...
August 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28816338/prediction-of-emergency-department-hospital-admission-based-on-natural-language-processing-and-neural-networks
#12
Xingyu Zhang, Joyce Kim, Rachel E Patzer, Stephen R Pitts, Aaron Patzer, Justin D Schrager
OBJECTIVE: To describe and compare logistic regression and neural network modeling strategies to predict hospital admission or transfer following initial presentation to Emergency Department (ED) triage with and without the addition of natural language processing elements. METHODS: Using data from the National Hospital Ambulatory Medical Care Survey (NHAMCS), a cross-sectional probability sample of United States EDs from 2012 and 2013 survey years, we developed several predictive models with the outcome being admission to the hospital or transfer vs...
August 16, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28816097/meltblown-polymer-fabrics-as-candidate-scaffolds-for-rotator-cuff-tendon-tissue-engineering
#13
Thomas Jenkins, Sean Meehan, Behnam Pourdeyhimi, Dianne Little
Various biomaterial technologies are promising for tissue engineering, including electrospinning, but commercial scale-up of throughput is difficult. The goal of the study was to evaluate meltblown fabrics as candidate scaffolds for rotator cuff tendon tissue engineering. Meltblown poly(lactic acid) fabrics were produced with several polymer crystallinities and airflow velocities (500(low), 900(medium) or 1400(high) m<sup>3</sup>air/hour/m fabric). Fiber diameter, alignment, and baseline bi-directional tensile mechanical properties were evaluated...
August 17, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28815946/model-catalytic-studies-of-novel-liquid-organic-hydrogen-carriers-indole-indoline-and-octahydroindole-on-pt-111
#14
Matthias Schwarz, Philipp Bachmann, Thais Nascimento Silva, Susanne Mohr, Marlene Scheuermeyer, Florian Späth, Udo Bauer, Fabian Düll, Johann Steinhauer, Chantal Hohner, Tibor Döpper, Heshmat Noei, Andreas Stierle, Christian Papp, Hans-Peter Steinrück, Peter Wasserscheid, Andreas Görling, Jörg Libuda
Indole derivatives were recently proposed as potential Liquid Organic Hydrogen Carriers (LOHC) for storage of renewable energies. In this work, we have investigated the adsorption, dehydrogenation and degradation mechanisms in the indole/indoline/octahydroindole system on Pt(111). We have combined infrared reflection absorption spectroscopy (IRAS), X-ray photoelectron spectroscopy (XPS) and density functional (DF) calculations. Indole multilayers show a crystallization transition at 200 K, in which the molecules adopt a strongly tilted orientation, before the multilayer desorbs at 220 K...
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815603/registration-of-phase-contrast-images-in-propagation-based-x-ray-phase-tomography
#15
L Weber, A Hänsch, U Wolfram, A Pacureanu, P Cloetens, F Peyrin, S Rit, M Langer
X-ray phase tomography aims at reconstructing the 3D electron density distribution of an object. It offers enhanced sensitivity compared to attenuation-based X-ray absorption tomography. In propagation-based methods, phase contrast is achieved by letting the beam propagate after interaction with the object. The phase shift is then retrieved at each projection angle, and subsequently used in tomographic reconstruction to obtain the refractive index decrement distribution, which is proportional to the electron density...
August 16, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28814742/the-candida-albicans-hir-histone-chaperone-regulates-the-yeast-to-hyphae-transition-by-controlling-the-sensitivity-to-morphogenesis-signals
#16
Sabrina Jenull, Michael Tscherner, Megha Gulati, Clarissa J Nobile, Neeraj Chauhan, Karl Kuchler
Morphological plasticity such as the yeast-to-hyphae transition is a key virulence factor of the human fungal pathogen Candida albicans. Hyphal formation is controlled by a multilayer regulatory network composed of environmental sensing, signaling, transcriptional modulators as well as chromatin modifications. Here, we demonstrate a novel role for the replication-independent HIR histone chaperone complex in fungal morphogenesis. HIR operates as a crucial modulator of hyphal development, since genetic ablation of the HIR complex subunit Hir1 decreases sensitivity to morphogenetic stimuli...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814165/ag-implantation-induces-mechanical-properties-cell-adhesion-and-antibacterial-effects-of-tin-ag-multilayers-in-vitro
#17
Xiuhua Sun, Huanhuan Gong, Dejun Li, Lei Dong, Mengli Zhao, Rongxin Wan, Hanqing Gu
AIM: This study aims to investigate the effect of Ag(+) implantation dose on the structure, hardness, adhesion strength, friction resistance, cell adhesion and antibacterial effects of TiN/Ag multilayers. METHODS: Nanoscale TiN/Ag multilayers were deposited on Ti-6Al-4V substrates using multiarc ion plating. The multilayers were then implanted by Ag ions. RESULTS: A distinct multilayer structure and large titanium nitride grains with better (111) crystallinity were proved...
August 17, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28812678/the-multilayer-nature-of-ecological-networks
#18
Shai Pilosof, Mason A Porter, Mercedes Pascual, Sonia Kéfi
Although networks provide a powerful approach to study a large variety of ecological systems, their formulation does not typically account for multiple interaction types, interactions that vary in space and time, and interconnected systems such as networks of networks. The emergent field of 'multilayer networks' provides a natural framework for extending analyses of ecological systems to include such multiple layers of complexity, as it specifically allows one to differentiate and model 'intralayer' and 'interlayer' connectivity...
March 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811540/ultralow-lattice-thermal-conductivity-of-the-random-multilayer-structure-with-lattice-imperfections
#19
Pranay Chakraborty, Lei Cao, Yan Wang
Randomizing the layer thickness of superlattices (SL) can lead to localization of coherent phonons and thereby reduces the lattice thermal conductivity κ l . In this work, we propose strategies that can suppress incoherent phonon transport in the above random multilayer (RML) structure to further reduce κ l . Molecular dynamics simulations are conducted to investigate phonon heat conduction in SLs and RMLs with lattice imperfections. We found that interfacial species mixing enhances thermal transport across single interfaces and few-period SLs through the phonon "bridge" mechanism, while it substantially reduces the κ l of many-period SLs by breaking the phonon coherence...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810168/plagiarism-governance-in-nurse-education-dispositions-dimensions-and-tensions
#20
Marion Welsh
The reality of managing plagiarism in nurse education is indicative of multilayered and cumulative governance processes, which exist to fit with the needs of both the higher education institution and that of the Professional Statutory and Regulatory Body. However, the relationship between these entities is diffuse, particularly when this involves major plagiarism by post-qualified learners. This study sought to explore the strategic governance of plagiarism in Scottish higher education institutions offering nurse education and its articulation with the professional requirements of nurse education...
August 8, 2017: Nurse Education in Practice
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