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https://www.readbyqxmd.com/read/28549338/fast-backprojection-based-reconstruction-of-spectral-spatial-epr-images-from-projections-with-the-constant-sweep-of-a-magnetic-field
#1
Denis A Komarov, Hiroshi Hirata
In this paper, we introduce a procedure for the reconstruction of spectral-spatial EPR images using projections acquired with the constant sweep of a magnetic field. The application of a constant field-sweep and a predetermined data sampling rate simplifies the requirements for EPR imaging instrumentation and facilitates the backprojection-based reconstruction of spectral-spatial images. The proposed approach was applied to the reconstruction of a four-dimensional numerical phantom and to actual spectral-spatial EPR measurements...
May 17, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28547747/deciphering-common-recognition-principles-of-nucleoside-mono-di-and-tri-phosphates-binding-in-diverse-proteins-via-structural-matching-of-their-binding-sites
#2
Raghu Bhagavat, Narayanaswamy Srinivasan, Nagasuma Chandra
Nucleoside triphosphate (NTP) ligands are of high biological importance and essential for all life forms. A pre-requisite for them to participate in diverse biochemical processes is their recognition by diverse proteins. It is thus of great interest to understand the basis for such recognition in different proteins. Towards this, we have employed a structural bioinformatics approach and analyse structures of 4677 NTP complexes available in PDB. Binding sites were extracted and compared exhaustively by using PocketMatch, a sensitive in-house site comparison algorithm, which resulted in grouping the entire dataset into 27 site-types...
May 25, 2017: Proteins
https://www.readbyqxmd.com/read/28544167/molecular-graph-paper
#3
Marcin Lindner, Michal Valášek, Marcel Mayor, Timo Frauhammer, Wulf Wulfhekel, Lukas Gerhard
We present a self-assembled template of tetraphenylmethane-based variants on a Au(111) surface which feature a periodic lateral arrangement of acetyl groups sticking out of the molecular film. Using the tip of a scanning tunneling microscope, this acetyl group can be removed in a spatially controlled way without a significant effect on the remaining molecular assembly. The chemically modified molecule can readily be distinguished from the original ones such that information can be engraved in the molecular film...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28541250/plasmonic-surface-nanostructuring-of-au-dots-sio2-via-laser-irradiation-induced-dewetting
#4
Ruixuan Yu, Tamaki Shibayama, Junya Ishioka, Xuan Meng, Yanhua Lei, Seiichi Watanabe
The in-situ observation of Au dot formation and the self-assembly dynamics of Au nanoparticles (NPs) was successfully demonstrated via dewetting of Au thin films on SiO<sub>2</sub> glass substrates under nano-second pulsed laser irradiation using a multi-quantum beam high-voltage electron microscope. Moreover, using electron energy-loss spectroscopy (EELS) performed in a scanning transmission electron microscope (STEM), the plasmonic properties of the formed Au/SiO<sub>2</sub> nanostructure were analyzed to demonstrate its validity in advanced optical devices...
May 25, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28539854/the-effect-of-hydrofluoric-acid-surface-treatment-on-the-cyclic-fatigue-resistance-of-k3-niti-instruments
#5
Kee-Yeon Kum, Seok Woo Chang
The aim of this study was to investigate the effect of 50% hydrofluoric acid (HF) surface treatment on the cyclic fatigue resistance (CFR) of K3 NiTi instruments. Twenty as-received and twenty HF-treated K3 NiTi instruments were compared in CFR. The surface texture and fracture surface of two instrument groups were examined with a scanning electron microscope (SEM). Additionally, any change of Ni and Ti composition from both instrument groups was investigated using energy dispersive spectrometry. The results were analyzed with t-test...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28537626/highly-transparent-supercapacitors-based-on-zno-mno2-nanostructures
#6
M A Borysiewicz, M Ekielski, Z Ogorzałek, M Wzorek, J Kaczmarski, T Wojciechowski
The recent rapid development of transparent electronics, notably displays and control circuits, requires the development of highly transparent energy storage devices, such as supercapacitors. The devices reported to date utilize carbon-based electrodes for high performance, however at the cost of their low transparency around 50%, insufficient for real transparent devices. To overcome this obstacle, in this communication highly transparent supercapacitors were fabricated based on ZnO/MnO2 nanostructured electrodes...
May 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28535590/emission-of-volatile-organic-compounds-and-production-of-secondary-organic-aerosol-from-stir-frying-spices
#7
Tengyu Liu, Qianyun Liu, Zijun Li, Lei Huo, ManNin Chan, Xue Li, Zhen Zhou, Chak K Chan
Cooking is an important source of volatile organic compounds (VOCs) and a potential source of secondary organic aerosol (SOA) both indoors and outdoors. In this study, VOC emissions from heating corn oil and stir-frying spices (i.e. garlic, ginger, myrcia and zanthoxylum piperitum (Sichuan pepper)) were characterized using an on-line membrane inlet vacuum ultraviolet single-photon ionization time-of-flight mass spectrometer (VUV-SPI-TOFMS). VOC emissions from heating corn oil were dominated by aldehydes, which were enhanced by factors of one order of magnitude when stir-frying spices...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28534481/structural-water-engaged-disordered-vanadium-oxide-nanosheets-for-high-capacity-aqueous-potassium-ion-storage
#8
Daniel Scott Charles, Mikhail Feygenson, Katharine Page, Joerg Neuefeind, Wenqian Xu, Xiaowei Teng
Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and instabilities even in layered electrodes. Here we report that water induces structural rearrangements of the vanadium-oxygen octahedra and enhances stability of the highly disordered potassium-intercalated vanadium oxide nanosheets...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28532973/-a-mysterious-pleural-lesion-a-case-report
#9
Nicolas Piton, Florent Marguet, Adrien Trintignac, Paul Michelin, Daniel Benhamou, Jean-Christophe Sabourin
A computed tomography scanner first, then a magnetic resonance imaging were performed for chest pain in a 24-year-old woman allowed to find out a 5-cm long and 2-cm large right pleural tumour close to the rachis (T9 and T10) and spindle-shaped. This patient was a smoker and reported a fall down the stairs a few weeks ago. A scan-guided biopsy was decided and microscopic examination revealed a fibrous tissue in which were entrapped regular and non-suspicious alveolar glands. After elimination of differential diagnosis, the most probable hypothesis was that this lesion was due to the traumatism reported by the patient...
May 19, 2017: Annales de Pathologie
https://www.readbyqxmd.com/read/28532938/posterior-corneal-shape-comparison-of-height-data-from-3-corneal-topographers
#10
Tim de Jong, Matthew T Sheehan, Steven A Koopmans, Nomdo M Jansonius
PURPOSE: To compare the ability of 3 clinical corneal topographers to describe the posterior corneal shape. SETTING: University Medical Center Groningen, the Netherlands. DESIGN: Prospective observational study. METHODS: Corneas of healthy participants were measured twice with a dual Scheimpflug instrument (Galilei G2), a scanning-slit system (Orbscan IIz), and a single Scheimpflug instrument (Pentacam HR). Height data describing the posterior corneal shape were fit with Zernike polynomials...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28531650/positioned-substituent-effect-on-self-assembly-behaviors-of-perylene-diimide-derivatives-on-graphite
#11
Qian Wei, Wei Wang, Erjun Zhou, Xiao-Ping Liu, Ming-Hui Liang, Ke Deng, Jing-Kui Yang, Peng Jiang
Three kinds of π-conjugated perylenetetracarboxylic diimide (PTCDI)-based organic functional derivatives, i.e., N,N'-di(2-ethylhexyl)-3,4,9,10-perylene diimide (molecule 1), N,N'-di(2-ethylhexyl)-1,7-dithien-2-yl-3,4,9,10-perylene diimide (molecule 2), N,N'-di(2-ethylhexyl)-1,7-di(2-bromothien-5-yl)-perylene-3,4,9,10-perylene diimide (molecule 3), have been prepared and investigated by using a scanning tunneling microscopy under ambient conditions. All of them can form long-ranged ordered self-assembled monolayer (SAM) with two different phase structures on highly oriented pyrolitic graphite (HOPG) surface...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28530736/magnetic-field-controlled-graphene-oxide-based-origami-with-enhanced-surface-area-and-mechanical-properties
#12
Ok-Kyung Park, Chandra Sekhar Tiwary, Yang Yang, Sanjit Bhowmick, Soumya Vinod, Qingbo Zhang, Vicki L Colvin, S A Syed Asif, Robert Vajtai, Evgeni S Penev, Boris I Yakobson, Pulickel M Ajayan
One can utilize the folding of paper to build fascinating 3D origami architectures with extraordinary mechanical properties and surface area. Inspired by the same, the morphology of 2D graphene can be tuned by addition of magnetite (Fe3O4) nanoparticles in the presence of a magnetic field. The innovative 3D architecture with enhanced mechanical properties also shows a high surface area (∼2500 m(2) g(-1)) which is utilized for oil absorption. Detailed microscopy and spectroscopy reveal rolling of graphene oxide (GO) sheets due to the magnetic field driven action of magnetite particles, which is further supported by molecular dynamics (MD) simulations...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28530677/whole-genome-resequencing-of-292-pigeonpea-accessions-identifies-genomic-regions-associated-with-domestication-and-agronomic-traits
#13
Rajeev K Varshney, Rachit K Saxena, Hari D Upadhyaya, Aamir W Khan, Yue Yu, Changhoon Kim, Abhishek Rathore, Dongseon Kim, Jihun Kim, Shaun An, Vinay Kumar, Ghanta Anuradha, Kalinati Narasimhan Yamini, Wei Zhang, Sonnappa Muniswamy, Jong-So Kim, R Varma Penmetsa, Eric von Wettberg, Swapan K Datta
Pigeonpea (Cajanus cajan), a tropical grain legume with low input requirements, is expected to continue to have an important role in supplying food and nutritional security in developing countries in Asia, Africa and the tropical Americas. From whole-genome resequencing of 292 Cajanus accessions encompassing breeding lines, landraces and wild species, we characterize genome-wide variation. On the basis of a scan for selective sweeps, we find several genomic regions that were likely targets of domestication and breeding...
May 22, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28527185/surface-heparinization-and-blood-compatibility-modification-of-small-intestinal-submucosa-sis-for-small-caliber-vascular-regeneration
#14
Bensong Han, Feng Xue, Cunyi Fan, Xiumei Mo
OBJECTIVES: This study aims to investigate the small intestinal submucosal (SIS) surface after heparinization with the hypothermia plasma technique, to improve the blood compatibility of SIS, and to explore the possibility of construction of small-caliber vascular grafts with modified SIS scaffolds in vivo. METHODS: SIS films prepared from jejunums of pigs were processed for surface treatment at different time periods with the argon plasma initiation technique under vacuum, and were then immediately immersed in 4% (m/v) heparin sodium solution for 24-h heparinization...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28524105/structural-analysis-of-polymer-composites-using-spectral-domain-optical-coherence-tomography
#15
Muhammad Faizan Shirazi, Mansik Jeon, Jeehyun Kim
The structural analysis of nylon/graphene oxide (NY/GO) and polyetherblockamide/ trisilinolphenyl-polyhederal oligomeric silsesquioxane (PEBA/t-POSS) composites were performed using high-resolution spectral domain optical coherence tomography (SD-OCT). This optical technology revealed both cross-sectional, as well as sub-layer depth information of sample. The non-destructive real-time imaging demonstrated the nature of defects in the composites. The thickness and location of each defect point in the composites were measured using A-scan analysis on the SD-OCT images...
May 18, 2017: Sensors
https://www.readbyqxmd.com/read/28516955/spectral-correlations-in-a-random-distributed-feedback-fibre-laser
#16
Srikanth Sugavanam, Mariia Sorokina, Dmitry V Churkin
Random distributed feedback fibre lasers belong to the class of random lasers, where the feedback is provided by amplified Rayleigh scattering on sub-micron refractive index inhomogenities randomly distributed over the fibre length. Despite the elastic nature of Rayleigh scattering, the feedback mechanism has been insofar deemed incoherent, which corresponds to the commonly observed smooth generation spectra. Here, using a real-time spectral measurement technique based on a scanning Fabry-Pérot interferometer, we observe long-living narrowband components in the random fibre laser's spectrum...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28516211/early-endothelialization-associated-with-a-biolimus-a9-bioresorbable-polymer-stent-in-a-porcine-coronary-model
#17
Masayuki Mori, Kenji Sakata, Chiaki Nakanishi, Takuya Nakahashi, Masa-Aki Kawashiri, Kazuaki Yoshioka, Yoh Takuwa, Hirofumi Okada, Jun-Ichiro Yokawa, Masaya Shimojima, Tsuyoshi Yoshimuta, Shohei Yoshida, Masakazu Yamagishi, Kenshi Hayashi
Although Nobori(®), with a bioresorbable polymer and biolimus A9 abluminal coating, has unique characteristics, few data exist regarding endothelialization early after implantation. Fifteen Nobori(®) and 14 control bare-metal stents (S-stent™) were implanted in 12 pigs. Histopathology of stented segments, inflammation, and intimal fibrin content was evaluated on the 2nd and 14th day after implantation. On the 2nd day, endothelial cells were morphologically and immunohistologically confirmed on the surface of both stents, although some inflammatory cells might be involved...
May 17, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28515236/resonance-frequencies-of-honeybee-apis-mellifera-wings
#18
Christopher J Clark, Andrew M Mountcastle, Emily Mistick, Damian O Elias
During flight, insect wings bend and twist under the influence of aerodynamic and inertial forces. We tested whether wing resonance of honeybees (Apis mellifera) matches the wingbeat frequency, against the 'stiff element' hypothesis that the wing's first longitudinal mode exceeds the wingbeat frequency. Six bees were immobilized with their right wing pair outspread, and stimulated with a shaker while the normal modes were recorded with a Scanning Doppler Laser Vibrometer. The lowest normal mode of the wings was the first longitudinal bending mode, and at 602±145 Hz, greater than the wingbeat frequency of 234 Hz±13...
May 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#19
R Nalcaci, B Temel, S Çokakoğlu, H Türkkahraman, S Üsümez
AIM: To evaluate the effects of laser etching on the shear bond strengths (SBS) and failure modes of brackets bonded to fluorosed enamel. MATERIALS AND METHODS: This in vitro study included 34 fluorosed and 34 nonfluorosed teeth. Teeth were divided into four subgroups according to the etching procedure: Group (A) normal enamel etched with 37% phosphoric acid for 15 s, Group (B) nonfluorosed enamel etched with erbium:yttrium aluminum garnet (Er: YAG) laser for 15 s, Group (C) fluorosed enamel etched with 37% phosphoric acid for 30 s, Group (D) fluorosed enamel etched with Er: YAG laser for 30 s...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28513495/effect-of-post-crosslinking-haze-on-the-repeatability-of-scheimpflug-based-and-slit-scanning-imaging-devices
#20
Rohit Shetty, Aarti Agrawal, Rashmi Deshmukh, Luci Kaweri, Harsha L Rao, Harsha Nagaraja, Chaitra Jayadev
PURPOSE: The aim of this study was to analyze the effect of postcollagen crosslinking (CXL) haze on the measurement and repeatability of pachymetry and mean keratometry (Km) of four corneal topographers. MATERIALS AND METHODS: Sixty eyes of sixty patients with progressive keratoconus who had undergone accelerated CXL (ACXL) underwent imaging with a scanning slit imaging device (Orbscan II) and three Scheimpflug imaging devices (Pentacam HR, Sirius, and Galilei)...
April 2017: Indian Journal of Ophthalmology
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