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https://www.readbyqxmd.com/read/29143040/probing-optical-excitations-in-chevron-like-armchair-graphene-nanoribbons
#1
Richard Denk, Alberto Lodi-Rizzini, Shudong Wang, Michael Hohage, Peter Zeppenfeld, Jinming Cai, Roman Fasel, Pascal Ruffieux, Reinhard Franz Josef Berger, Zongping Chen, Akimitsu Narita, Xinliang Feng, Klaus Müllen, Roberto Biagi, Valentina De Renzi, Deborah Prezzi, Alice Ruini, Andrea Ferretti
The bottom-up fabrication of graphene nanoribbons (GNRs) has opened new opportunities to specifically tune their electronic and optical properties by precisely controlling their atomic structure. Here, we address excitation in GNRs with periodic structural wiggles, the so-called chevron GNRs. Based on reflectance difference and high-resolution electron energy loss spectroscopies together with ab initio simulations, we demonstrate that their excited-state properties are of excitonic nature. The spectral fingerprints corresponding to different reaction stages in their bottom-up fabrication are also unequivocally identified, allowing us to follow the exciton build-up from the starting monomer precursor to the final GNR structure...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29117197/new-records-of-the-dolphin-albertocetus-meffordorum-odontoceti-xenorophidae-from-the-lower-oligocene-of-south-carolina-encephalization-sensory-anatomy-postcranial-morphology-and-ontogeny-of-early-odontocetes
#2
Robert W Boessenecker, Erum Ahmed, Jonathan H Geisler
We report five new specimens of xenorophid dolphins from North and South Carolina. Four of the specimens represent the xenorophid Albertocetus meffordorum, previously only known from the holotype skull. The other is a fragmentary petrosal from the upper Oligocene Belgrade Formation that we refer to Echovenator sp, indicating at least two xenorophids from that unit. Two of the Albertocetus meffordorum specimens are from the lower Oligocene Ashley Formation: 1) a partial skeleton with neurocranium, fragmentary mandible, ribs, vertebrae, and chevrons, and 2) an isolated braincase...
2017: PloS One
https://www.readbyqxmd.com/read/29027088/redescription-of-philometra-filiformis-stossich-1896-nematoda-philometridae-a-gonad-infecting-parasite-of-the-common-pandora-pagellus-erythrinus-linnaeus-sparidae-in-the-mediterranean-sea-including-new-taxonomic-features-revealed-by-sem
#3
František Moravec, Nessrine Ghanmi, Amira Chaabane, Lamia Gargouri, Jean-Lou Justine
The insufficiently known nematode species Philometra filiformis (Stossich, 1896) (Philometridae) is redescribed based on light and scanning electron microscopical (SEM) examinations of specimens collected from the ovaries of the type-host, the common pandora Pagellus erythrinus (Linnaeus) (Perciformes, Sparidae), from off the Mediterranean coast of Tunisia. The male of this species was studied with SEM for the first time, which revealed some new, taxonomically important morphological features. The male posterior end has a caudal mound consisting of two lateral parts widely separated dorsally from each other, four pairs of small adanal papillae, a pair of large but moderately developed papillae located posterior to the cloacal aperture and a pair of small phasmids...
October 12, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/29018185/laterally-extended-atomically-precise-graphene-nanoribbons-with-improved-electrical-conductivity-for-efficient-gas-sensing
#4
Mohammad Mehdi Pour, Andrey Lashkov, Adrian Radocea, Ximeng Liu, Tao Sun, Alexey Lipatov, Rafal A Korlacki, Mikhail Shekhirev, Narayana R Aluru, Joseph W Lyding, Victor Sysoev, Alexander Sinitskii
Narrow atomically precise graphene nanoribbons hold great promise for electronic and optoelectronic applications, but the previously demonstrated nanoribbon-based devices typically suffer from low currents and mobilities. In this study, we explored the idea of lateral extension of graphene nanoribbons for improving their electrical conductivity. We started with a conventional chevron graphene nanoribbon, and designed its laterally extended variant. We synthesized these new graphene nanoribbons in solution and found that the lateral extension results in decrease of their electronic bandgap and improvement in the electrical conductivity of nanoribbon-based thin films...
October 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28945240/atomically-precise-graphene-nanoribbon-heterojunctions-from-a-single-molecular-precursor
#5
Giang D Nguyen, Hsin-Zon Tsai, Arash A Omrani, Tomas Marangoni, Meng Wu, Daniel J Rizzo, Griffin F Rodgers, Ryan R Cloke, Rebecca A Durr, Yuki Sakai, Franklin Liou, Andrew S Aikawa, James R Chelikowsky, Steven G Louie, Felix R Fischer, Michael F Crommie
The rational bottom-up synthesis of atomically defined graphene nanoribbon (GNR) heterojunctions represents an enabling technology for the design of nanoscale electronic devices. Synthetic strategies used thus far have relied on the random copolymerization of two electronically distinct molecular precursors to yield GNR heterojunctions. Here we report the fabrication and electronic characterization of atomically precise GNR heterojunctions prepared through late-stage functionalization of chevron GNRs obtained from a single precursor...
November 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28934690/butyl-benzyl-phthalate-bbp-induces-caudal-defects-during-embryonic-development
#6
Nicole M Roy, Ewelina Zambrzycka, Jenna Santangelo
Butyl benzyl phthalate (BBP) is commonly added during the manufacturing of plastics to increase flexibility and elasticity. However, BBP leaches off of plastic and environment presence has been detected in soil, groundwater and sediment potentially effecting organisms in the environment. Given the widespread uses of BBP in household, consumer goods and the presence of BBP in the environment, studies on developmental toxicity are needed. Here, we use a zebrafish model to investigate the early developmental toxicity of BBP...
September 18, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28883495/spatially-resolved-optical-and-structural-properties-of-semi-polar-formula-see-text-al-x-ga1-x-n-with-x-up-to-0-56
#7
Jochen Bruckbauer, Zhi Li, G Naresh-Kumar, Monika Warzecha, Paul R Edwards, Ling Jiu, Yipin Gong, Jie Bai, Tao Wang, Carol Trager-Cowan, Robert W Martin
Pushing the emission wavelength of efficient ultraviolet (UV) emitters further into the deep-UV requires material with high crystal quality, while also reducing the detrimental effects of built-in electric fields. Crack-free semi-polar [Formula: see text] Al x Ga1-x N epilayers with AlN contents up to x = 0.56 and high crystal quality were achieved using an overgrowth method employing GaN microrods on m-sapphire. Two dominant emission peaks were identified using cathodoluminescence hyperspectral imaging...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805214/the-low-populated-folding-intermediate-of-a-mutant-of-the-fyn-sh3-domain-identified-by-a-simple-model
#8
Jing Wu, Guojun Chen, Zhuqing Zhang, Ping Zhang, Tao Chen
Experimental studies indicate that the A39V/N53P/V55L Fyn SH3 domain folds from the unfolded state to the native state via a low-populated on-pathway intermediate, whereas the folding of the wildtype is two-state-like. To get insights into the biophysical basis of their different folding mechanisms, we used native-centric models with and without additional transferrable, sequence-dependent nonnative hydrophobic interactions to study the folding behaviors of the Fyn SH3 domain and its mutant. The pure native-centric model predicts that both the wildtype and the mutant fold in a two-state manner, without any detectable intermediate...
August 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28795092/-data-characterizing-microfabricated-human-blood-vessels-created-via-hydrodynamic-focusing
#9
Kyle A DiVito, Michael A Daniele, Steven A Roberts, Frances S Ligler, André A Adams
This data article provides further detailed information related to our research article titled "Microfabricated Blood Vessels Undergo Neovascularization" (DiVito et al., 2017) [1], in which we report fabrication of human blood vessels using hydrodynamic focusing (HDF). Hydrodynamic focusing with advection inducing chevrons were used in concert to encase one fluid stream within another, shaping the inner core fluid into 'bullseye-like" cross-sections that were preserved through click photochemistry producing streams of cellularized hollow 3-dimensional assemblies, such as human blood vessels (Daniele et al...
October 2017: Data in Brief
https://www.readbyqxmd.com/read/28719558/recurrence-of-hallux-valgus-can-be-predicted-from-immediate-postoperative-non-weight-bearing-radiographs
#10
Chul Hyun Park, Woo-Chun Lee
BACKGROUND: The aims of this study were to identify risk factors for the recurrence of hallux valgus deformity and to clarify whether recurrence after surgery to treat hallux valgus can be predicted using radiographic parameters assessed on immediate postoperative non-weight-bearing radiographs. METHODS: A proximal chevron osteotomy combined with a distal soft-tissue procedure was performed by a single surgeon to treat moderate to severe hallux valgus deformity in 93 patients (117 feet)...
July 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28713028/the-effect-of-fusarium-culmorum-infection-and-deoxynivalenol-don-application-on-proteome-response-in-barley-cultivars-chevron-and-pedant
#11
Klára Kosová, Jana Chrpová, Jiří Šantrůček, Radovan Hynek, Lenka Štěrbová, Pavel Vítámvás, Jana Bradová, Ilja Tom Prášil
Fusarium head blight (FHB) disease adversely affects grain quality and final yield in small-grain cereals including barley. In the present study, the effect of an artificial infection with Fusarium culmorum and an application of deoxynivalenol (DON) on barley spikes of cultivars Chevron and Pedant during flowering was investigated at grain mid-dough stage (BBCH 73) 10days after pathogen inoculation (10 dai). Proteomic analysis using a two-dimensional differential gel electrophoresis (2D-DIGE) technique coupled with LC-MS/MS investigated 98 protein spots revealing quantitative or qualitative differences between the experimental variants...
October 3, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28706351/beam-characterization-of-10-mv-photon-beam-from-medical-linear-accelerator-without-flattening-filter
#12
Tomohiro Shimozato, Yuichi Aoyama, Takuma Matsunaga, Katsuyoshi Tabushi
AIM: This work investigated the dosimetric properties of a 10-MV photon beam emitted from a medical linear accelerator (linac) with no flattening filter (FF). The aim of this study is to analyze the radiation fluence and energy emitted from the flattening filter free (FFF) linac using Monte Carlo (MC) simulations. MATERIALS AND METHODS: The FFF linac was created by removing the FF from a linac in clinical use. Measurements of the depth dose (DD) and the off-axis profile were performed using a three-dimensional water phantom with an ionization chamber...
April 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28702538/epitaxial-growth-of-aligned-atomically-precise-chevron-graphene-nanoribbons-on-cu-111
#13
Jacob D Teeter, Paulo S Costa, Mohammad Mehdi Pour, Daniel P Miller, Eva Zurek, Axel Enders, Alexander Sinitskii
Atomically precise chevron graphene nanoribbons (GNRs) have been synthesized on Cu(111) substrates by the surface-assisted coupling of 6,11-dibromo-1,2,3,4-tetraphenyltriphenylene (C42Br2H26) and thermal cyclodehydrogenation of the resulting polymer. The GNRs form on Cu(111) epitaxially along the 〈112〉 crystallographic directions, which was found to be in agreement with the computational results, and at lower temperatures than on Au(111). This work demonstrates that the substrate plays an important role in the on-surface synthesis of GNRs and can result in new assembly modes of GNR structures...
July 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28689801/a-systematic-review-of-the-effect-of-various-interventions-on-reducing-fatigue-and-sleepiness-while-driving
#14
Seyed Saeed Hashemi Nazari, Ali Moradi, Khaled Rahmani
PURPOSE: To identify and appraise the published studies assessing interventions accounting for reducing fatigue and sleepiness while driving. METHODS: This systematic review searched the following electronic databases: Medline, Science direct, Scopus, EMBASE, PsycINFO, Transport Database, Cochrane, BIOSIS, ISI Web of Knowledge, specialist road injuries journals and the Australian Transport and Road Index database. Additional searches included websites of relevant organizations, reference lists of included studies, and issues of major injury journals published within the past 15 years...
May 29, 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28686846/effect-of-first-tarsometatarsal-joint-derotational-arthrodesis-on-first-ray-dynamic-stability-compared-to-distal-chevron-osteotomy
#15
Tero Klemola, Juhana Leppilahti, Vesa Laine, Ilkka Pentikäinen, Risto Ojala, Pasi Ohtonen, Olli Savola
BACKGROUND: Hallux valgus alters gait, compromising first ray stability and function of the windlass mechanism at the late stance. Hallux valgus correction should restore the stability of the first metatarsal. Comparative studies reporting the impact of different hallux valgus correction methods on gait are rare. We report the results of a case-control study between distal chevron osteotomy and first tarsometatarsal joint derotational arthrodesis (FTJDA). METHODS: Two previously studied hallux valgus cohorts were matched: distal chevron osteotomy and FTJDA...
August 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28649466/the-venice-specimen-of-ouranosaurus-nigeriensis-dinosauria-ornithopoda
#16
Filippo Bertozzo, Fabio Marco Dalla Vecchia, Matteo Fabbri
Ouranosaurus nigeriensis is an iconic African dinosaur taxon that has been described on the basis of two nearly complete skeletons from the Lower Cretaceous Gadoufaoua locality of the Ténéré desert in Niger. The entire holotype and a few bones attributed to the paratype formed the basis of the original description by Taquet (1976). A mounted skeleton that appears to correspond to O. nigeriensis has been on public display since 1975, exhibited at the Natural History Museum of Venice. It was never explicitly reported whether the Venice specimen represents a paratype and therefore, the second nearly complete skeleton reported in literature or a third unreported skeleton...
2017: PeerJ
https://www.readbyqxmd.com/read/28643699/nonequilibrium-ferroelectric-ferroelastic-10%C3%A2-nm-nanodomains-wrinkles-period-doubling-and-power-law-relaxation
#17
James F Scott, Donald M Evans, Ram S Katiyar, Raymond G P McQuaid, J Marty Gregg
Since the 1935 work of Landau-Lifshitz and of Kittel in 1946 all ferromagnetic, ferroelectric, and ferroelastic domains have been thought to be straight-sided with domain widths proportional to the square root of the sample thickness. We show in the present work that this is not true. We also discover period doubling domains predicted by Metaxas et al (2008 Phys. Rev. Lett. 99 217208) and modeled by Wang and Zhao (2015 Sci. Rep. 5 8887). We examine non-equilibrium ferroic domain structures in perovskite oxides with respect to folding, wrinkling, and relaxation and suggest that structures are kinetically limited and in the viscous flow regime predicted by Metaxas et al in 2008 but never observed experimentally...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28628523/effectiveness-of-surgery-for-adults-with-hallux-valgus-deformity-a-systematic-review
#18
Jitka Klugarova, Victoria Hood, Fiona Bath-Hextall, Miloslav Klugar, Jana Mareckova, Zuzana Kelnarova
BACKGROUND: Hallux valgus (HV) is a common foot deformity. In severe stages of this condition, surgery is often necessary. Currently, there is no systematic review comparing the effectiveness of surgery over conservative treatment. OBJECTIVES: The objective of this review was to establish the effectiveness of surgery compared to conservatory management for adults with HV. INCLUSION CRITERIA TYPES OF PARTICIPANTS: The current review included adults (18 years or over) with HV deformity, excluding adults with neurological problems causing foot deformities, for example, cerebral palsy, neuropathy, stroke and multiple sclerosis...
June 2017: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28570657/modeling-of-a-viscoelastic-damper-and-its-application-in-structural-control
#19
M H Mehrabi, Meldi Suhatril, Zainah Ibrahim, S S Ghodsi, Hamed Khatibi
Conventional seismic rehabilitation methods may not be suitable for some buildings owing to their high cost and time-consuming foundation work. In recent years, viscoelastic dampers (VEDs) have been widely used in many mid- and high-rise buildings. This study introduces a viscoelastic passive control system called rotary rubber braced damper (RRBD). The RRBD is an economical, lightweight, and easy-to-assemble device. A finite element model considering nonlinearity, large deformation, and material damage is developed to conduct a parametric study on different damper sizes under pushover cyclic loading...
2017: PloS One
https://www.readbyqxmd.com/read/28479258/triceps-sparing-extra-articular-step-cut-olecranon-osteotomy-for-distal-humeral-fractures-an-anatomic-study
#20
Matthias A Zumstein, Sumit Raniga, Remy Flueckiger, Lorenzo Campana, Beat K Moor
BACKGROUND: This anatomic study investigated the distal humeral articular surface exposure achievable through a triceps-sparing oblique extra-articular osteotomy of the olecranon with a step-cut modification compared with the anconeus flap transolecranon apex distal chevron osteotomy. In addition, the bone contact surface areas of the osteotomized surfaces after transolecranon and extra-articular osteotomies were compared. METHODS: Seven pairs of fresh adult cadaveric elbow joints were examined...
September 2017: Journal of Shoulder and Elbow Surgery
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