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Surface Orientation

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https://www.readbyqxmd.com/read/30537686/polymer-spreading-on-substrates-with-nanoscale-grooves-using-molecular-dynamics
#1
Brooklyn A Noble, Bart Raeymaekers
Understanding how liquid polymer interacts with and spreads on surfaces with nanoscale texture features is crucial for designing complex nanoscale systems. We use molecular dynamics to simulate different types of polymer as they spread on substrates with a single nanoscale groove. We study how groove design affects the potential energy of a substrate and how this governs polymer spreading and orientation. Based on our simulations, we show that groove shape, polymer chemistry, and polymer molecule entanglement are the three parameters that determine polymer spreading on a nanoscale groove...
December 11, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30537685/cu2o-porous-nanostructured-films-fabricated-by-positive-bias-sputtering-deposition
#2
Yiqi Zhu, Ji Ma, Lei Zhou, Yang Liu, Meiping Jiang, Xianfang Zhu, Jiangbin Su
In this work, the authors fabricated Cu2O porous nanostructured films (PNFs) on glass slide substrates by the newly developed positive bias deposition approach in a balanced magnetron sputtering (MS) system. It was found that the surface morphology, crystal structure and optical property of the as-deposited products were greatly dependent on the applied positive substrate bias. In particular, when the substrate was biased at +50 V and +150 V, both of the as-prepared Cu2O PNFs exhibited a unique triangular pyramids-like structure with obvious edges and corners and little gluing, a preferred orientation of (111) and a blue shift of energy band gap at 2...
December 11, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30537681/integration-of-sputter-deposited-multiferroic-cofe2o4-bifeo3-nanocomposites-on-conductive-la0-7sr0-3mno3-electrodes
#3
Seung Han Lee, Guo Tian, Tae Cheol KIm, Hyun Kyu Jung, Jun Woo Choi, Frederick J Walker, Charles H Ahn, Caroline A Ross, Dong Hun Kim
The structure, magnetic and ferroelectric properties of sputtered epitaxial CoFe2O4-BiFeO3 (CFO-BFO) nanocomposite thin films grown on La0.7Sr0.3MnO3 (LSMO) layers on (001) oriented SrTiO3 (STO) substrates and on STO-buffered Si are described. The as-grown LSMO thin films were smooth and poorly conductive but the resistivity was reduced and the surfaces roughened after annealing. Cosputtered CFO and BFO on STO formed vertically aligned nanostructures consisting of epitaxial spinel CFO pillars within a perovskite BFO matrix, but the rough surface of the annealed LSMO film promoted additional CFO pillar orientations...
December 11, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30537672/plan-view-transmission-electron-microscopy-specimen-preparation-for-atomic-layer-materials-using-a-focused-ion-beam-approach
#4
Lan-Hsuan Lee, Chia-Hao Yu, Chuan-Yu Wei, Pei-Chin Lee, Jih-Shang Huang, Cheng-Yen Wen
Using the focused ion beam (FIB) to prepare plan-view transmission electron microscopy (TEM) specimens is beneficial for obtaining structural information of two-dimensional atomic layer materials, such as graphene and molybdenum disulfide (MoS2 ) nanosheets supported on substrates. The scanning electron microscopy (SEM) image in a dual-beam FIB-SEM can accurately locate an area of interest for specimen preparation. Besides, FIB specimen preparation avoids damages and hydrocarbon contamination that are usually produced in other preparation methods, in which chemical etching and polymer adhesion layers are used...
December 5, 2018: Ultramicroscopy
https://www.readbyqxmd.com/read/30536917/organisation-of-health-services-for-preventing-and-treating-pressure-ulcers
#5
REVIEW
Pauline Joyce, Zena Eh Moore, Janice Christie
BACKGROUND: Pressure ulcers, which are a localised injury to the skin, or underlying tissue, or both, occur when people are unable to reposition themselves to relieve pressure on bony prominences. Pressure ulcers are often difficult to heal, painful, expensive to manage and have a negative impact on quality of life. While individual patient safety and quality care stem largely from direct healthcare practitioner-patient interactions, each practitioner-patient wound-care contact may be constrained or enhanced by healthcare organisation of services...
December 9, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/30535889/oligomeric-transition-and-dynamics-of-rna-binding-by-the-hur-rrm1-domain-in-solution
#6
Carolina Lixa, Amanda Mujo, Mariana T Q de Magalhães, Fabio C L Almeida, Luis Mauricio T R Lima, Anderson S Pinheiro
Human antigen R (HuR) functions as a major post-transcriptional regulator of gene expression through its RNA-binding activity. HuR is composed by three RNA recognition motifs, namely RRM1, RRM2, and RRM3. The two N-terminal RRM domains are disposed in tandem and contribute mostly to HuR interaction with adenine and uracil-rich elements (ARE) in mRNA. Here, we used a combination of NMR and electrospray ionization-ion mobility spectrometry-mass spectrometry (ESI-IMS-MS) to characterize the structure, dynamics, RNA recognition, and dimerization of HuR RRM1...
December 8, 2018: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/30535119/the-modified-arch-landing-areas-nomenclature-identifies-hostile-zones-for-endograft-deployment-a-confirmatory-biomechanical-study-in-patients-treated-by-thoracic-endovascular-aortic-repair
#7
Massimiliano M Marrocco-Trischitta, Rodrigo M Romarowski, Hector W de Beaufort, Michele Conti, Renato Vitale, Francesco Secchi, Ferdinando Auricchio, Santi Trimarchi
OBJECTIVES: Our goal was to confirm whether the Modified Arch Landing Areas Nomenclature (MALAN) for thoracic endovascular aortic repair, in which each landing area is described by indicating both the proximal landing zone (PLZ) and the type of arch (e.g. 0/I), identifies unfavourable landing zones for endograft deployment in diseased aortas. METHODS: Preoperative computed tomography angiography scans of 10 patients scheduled for thoracic endovascular aortic repair for aneurysm or penetrating ulcer of the arch and with a potential hostile PLZ were reviewed...
December 7, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/30534828/morphological-study-of-upper-wisdom-tooth
#8
Liana Todor, Ruxandra Ilinca Matei, Gabriela Muţiu, Anca Porumb, Gabriela Ciavoi, Emilia Albiniţa Cuc, Adriana Ţenţ, Daniela Domocoş, Ioana Scrobotă, Sergiu Andrei Todor, Mihaela Cristiana Coroi
The article presents aspects of crown and root morphology of the superior wisdom teeth, aiming to several parameters: size, shape crown and occlusal surface, number, topography and orientation of the roots in order to determine which the most common morphological types are. For this purpose, the upper wisdom teeth were collected. According to studies, the dominant form of the dental crown is parallelepipedic, the rectangular or parallelogram shape of the occlusal surface has large mesial and distal-oriented sides...
2018: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/30534758/morphology-controlled-copper-nanowire-synthesis-and-magnetic-field-assisted-self-assembly
#9
Srikar Rao Darmakkolla, Mitra Ghobadi, Lester Lampert, Amanda F Pareira, Ana Jenike, Musa Tahir, Shankar B Rananavare
Morphology, dimensions, crystalline structure and compositions of nanomaterials are very critical in determining their unique characteristics. Here we report how the reducing agent concentration affects the surface morphology of copper nanowires and establish the optimized reaction conditions to synthesize high aspect ratio nanowires with a smooth surface. Also, reported is the magnetic field assisted technique to control the orientational and positional ordering of cupronickel nanowires (Cu/Ni NWs) on a large-scale area...
December 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/30534689/ultrahigh-efficiency-aqueous-flat-nanocrystals-of-cdse-cds-cd-1-x-zn-x-s-colloidal-core-crown-alloyed-shell-quantum-wells
#10
Sushant Shendre, Savas Delikanli, Mingjie Li, Didem Dede, Zhenying Pan, Son Tung Ha, Yuan Hsing Fu, Pedro L Hernández-Martínez, Junhong Yu, Onur Erdem, Arseniy I Kuznetsov, Cuong Dang, Tze Chien Sum, Hilmi Volkan Demir
Colloidal semiconductor nanoplatelets (NPLs) are highly promising luminescent materials owing to their exceptionally narrow emission spectra. While high-efficiency NPLs in non-polar organic media can be obtained readily, NPLs in aqueous media suffer from extremely low quantum yields (QYs), which completely undermines their potential, especially in biological applications. Here, we show high-efficiency water-soluble CdSe/CdS@Cd1-xZnxS core/crown@shell NPLs formed by layer-by-layer grown and composition-tuned gradient Cd1-xZnxS shells on CdSe/CdS core/crown seeds...
December 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/30534671/self-assembly-of-a-silicon-containing-side-chain-liquid-crystalline-block-copolymer-in-bulk-and-in-thin-films-kinetic-pathway-of-a-cylinder-to-sphere-transition
#11
Fen Liao, Ling-Ying Shi, Li-Chen Cheng, Sangho Lee, Rong Ran, Kevin G Yager, Caroline A Ross
The self-assembly of a high-χ silicon-containing side-chain liquid crystalline block copolymer (LC BCP) in bulk and in thin films is reported, and the structural transition process from the hexagonally packed cylinder (HEX) to the body-centered cubic structure (BCC) in thin films was examined by both reciprocal and real space experimental methods. The block copolymer, poly(dimethylsiloxane-b-11-(4'-cyanobiphenyl-4-yloxy)undecylmethacrylate) (PDMS-b-P(4CNB11C)MA) with a molecular weight of 19.5 kg mol-1 and a volume fraction of PDMS 27% self-assembled in bulk into a hierarchical nanostructure of sub-20 nm HEX cylinders of PDMS with the P(4CNB11C)MA block exhibiting a smectic LC phase with a 1...
December 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/30534619/panoramic-azimuthal-schlumberger-vertical-electrical-sounding-for-fracture-orientation-and-anisotropy-quantification
#12
Jide Nosakare Ogunbo, Emmanuel Abiodun Mamukuyomi, Wahab Stephens Adepoju, Harrison Adebowale, Olamide Akinro, Chukwuebuka Richard Ukaegbu
Vertical electrical sounding (VES) data acquired with the Schlumberger configuration is popularly used to image the electrical resistivity variation with depth at a single azimuth. Apart from the random subjective choice of the single azimuthal direction by the field geophysicists, important hydrological information such as fracture orientation and anisotropic coefficients needed for understanding resultant groundwater flow direction are by design lost in the process. Panoramic (0°-360°) azimuthal VES data were acquired at two data points at the Federal University of Technology, Akure (FUTA) at angular step of 15°, making a total of 24 data sets per data point...
December 2018: Heliyon
https://www.readbyqxmd.com/read/30534476/rationalizing-the-vascular-anatomy-for-oblique-osteotomy-of-the-metatarsal-head-during-toe-joint-transfers-of-the-metatarsophalangeal-joint
#13
Yu-Te Lin, Shih-Heng Chen, Charles Yuen Yung Loh, Chung-Cheng Hsu, Cheng-Hung Lin
Background: The metatarsophalangeal joint (MTPJ) of the lessor toe has been used to reconstruct the metacarpophalangeal joint. When an oblique osteotomy of the metatarsal head is performed, the orientation of the vascular pedicle is crucial to preserve the blood supply to the MTPJ. This study was conducted to identify the path of the nutrient artery to the MTPJ. Methods: We reviewed our operative records in consecutive series of 45 patients during toe or joint harvest...
October 2018: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/30530838/orienting-to-polarized-light-at-night-matching-lunar-skylight-to-performance-in-a-nocturnal-beetle
#14
James J Foster, John D Kirwan, Basil El Jundi, Jochen Smolka, Lana Khaldy, Emily Baird, Marcus J Byrne, Dan-Eric Nilsson, Sönke Johnsen, Marie Dacke
For polarized light to inform behaviour, the typical range of degrees of polarization observable in the animal's natural environment must be above the threshold for detection and interpretation. Here we present the first investigation of the degree of linear polarization threshold for orientation behaviour in a nocturnal species, with specific reference to the range of degrees of polarization measured in the night sky. An effect of lunar phase on the degree of polarization of skylight was found, with smaller illuminated fractions of the moon's surface corresponding to lower degrees of polarization in the night sky...
December 10, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/30530338/fundamental-characterization-of-conductive-intracardiac-communication-for-leadless-multisite-pacemaker-systems
#15
Lukas Bereuter, Timon Kuenzle, Thomas Niederhauser, Martin Kucera, Dominik Obrist, Tobias Reichlin, Hildegard Tanner, Andreas Haeberlin
OBJECTIVE: A new generation of leadless cardiac pacemakers effectively overcomes the main limitations of conventional devices, but only offer single-chamber pacing, although dual-chamber or multisite pacing is highly desirable for most patients. The combination of several leadless pacemakers could facilitate a leadless multisite pacemaker but requires an energy-efficient wireless communication for device synchronization. This work investigates the characteristics of conductive intracardiac communication between leadless pacemakers to provide a basis for future designs of leadless multisite pacemaker systems...
December 10, 2018: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/30530170/pedal-and-haptic-estimates-of-slant-suggest-a-common-underlying-representation
#16
Dennis M Shaffer, Kirsten M Greer, Jackson T Schaffer, Meghan Burkhardt, Ky Mattingly, Brandon Short, Cage Cramer
It is well known that people verbally exaggerate the slant of visually perceived geographical, virtual, and man-made hills. More recently it has been shown that haptic and verbal estimates of slant result in similar exaggerations, supporting the proprioception calibration hypothesis-that similar biases exist in both verbal estimates of visually perceived slant and proprioceptively perceived hand orientation. This seems to point to a common underlying representation of slant. However, it is unclear if and how manual proprioceptive estimates might be relevant for perception of ground surface slant or how this might translate to pedal perception of surface orientation...
December 7, 2018: Acta Psychologica
https://www.readbyqxmd.com/read/30530004/insight-into-the-mechanism-and-factors-on-encapsulating-basic-model-protein-lysozyme-into-heparin-doped-caco-3
#17
Pengzhong Shi, Jianghui Qin, Jingyan Hu, Yu Bai, Xingjie Zan
Porous CaCO3 microparticles are considered as one of the most popular and effective carriers for protein loading. Most of current studies have centered on elucidating particle formation and enhancing the protein loading efficiency, very few reports on the kinetics, driving forces and factors on protein loading process. Here, we took lysozyme as the basic model protein to investigate the kinetics, driving forces on protein loading and factors controlling loading efficiency into porous Hep/CaCO3 microparticles by various techniques (protein quantification assay, QCM-D, SEM, BET, Zeta sizer, TGA, CLSM, CD spectrum, bioactive assay)...
November 29, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/30528610/antimicrobial-coatings-prepared-from-dhvar-5-click-grafted-chitosan-powders
#18
Mariana Barbosa, Fabíola Costa, Cláudia Monteiro, Filipa Duarte, M Cristina L Martins, Paula Gomes
Antimicrobial peptides (AMP) are powerful components of the innate immune system, as they display wide activity spectrum and low tendency to induce pathogen resistance. Hence, the development of AMP-based coatings is a very promising strategy to prevent biomaterials-associated infections. This work aims to investigate if Dhvar-5-chitosan conjugates, previously synthesized by us via azide-alkyne "click" reaction, can be applied as antimicrobial coatings. Ultrathin coatings were prepared by spin coater after dissolving Dhvar-5-chitosan conjugate powder in aqueous acetic acid...
December 5, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/30526025/three-dimensional-embryonic-image-segmentation-and-registration-based-on-shape-index-and-ellipsoid-fitting-method
#19
Sihai Yang, Xianhua Han, Yenwei Chen
Quantitative analysis based on three-dimensional differential interference contrast (DIC) images is currently the mainstream in analyzing gene functions involved in early cell fate specifications. Segmentation and registration are the two most important steps in analysis. Many image segmentation methods have poor performance on embryonic DIC images because of the interference of egg shells, blurs, and nonuniform intensity background. A novel segmentation method is presented based on the shape index (SI) of local intensity variation in DIC images...
December 5, 2018: Journal of Computational Biology: a Journal of Computational Molecular Cell Biology
https://www.readbyqxmd.com/read/30525717/competing-adsorption-mechanisms-of-pyridine-on-cu-ag-au-and-pt-110-surfaces
#20
Walter Malone, Johnathan von der Heyde, Abdelkader Kara
We explore the adsorption of pyridine on Cu, Ag, Au, and Pt(110) surfaces using density functional theory. To account for the van der Waals interaction, we use the optB86b-vdW, optB88-vdW, optPBE-vdW, revPBE-vdW, and rPW86-vdW2 functionals. For comparison, we also run calculations using the generalized gradient approximation-PBE (Perdew-Burke-Ernzerhof) functional. We find the most stable adsorption site to depend on both metal and functional, with two energetically favorable adsorption sites, namely, a vertically oriented site and a flat pyridine site...
December 7, 2018: Journal of Chemical Physics
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