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https://www.readbyqxmd.com/read/28651206/an-investigation-of-the-role-of-defect-levels-on-the-radiation-response-of-synthetic-diamond-crystals-when-used-as-sensors-for-the-detection-of-mammography-x-rays
#1
Nicholas Ade
This study evaluates the role of defects on the performances of synthetic diamond sensors on exposure to mammography X-rays. Through systematic investigations, the main cause of instability of response of examined sensors necessitating pre-irradiation was isolated and ascribed to the presence of ambient light which has the effect of emptying shallow trapping levels. The changes in response between measurements in light and dark conditions varied from 2.8 ± 1.2% to 63.0 ± 0.3%. Sensitivities between 0.4 and 6...
June 17, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28650647/highly-efficient-and-stable-sn-rich-perovskite-solar-cells-by-introducing-bromine
#2
Seojun Lee, Dong-Won Kang
Compositional engineering of recently-arising methylammonium (MA) lead (Pb) halide based perovskites is an essential approach for finding better perovskite compositions to resolve still remaining issues of toxic Pb, and long-term instability, etc. In this work, we carried out crystallographic, morphological, optical, and photovoltaic characterization of compositional MASn0.6Pb0.4I3-xBrx by gradually introducing bromine (Br) into parental Pb-Sn binary perovskite (MASn0.6Pb0.4I3) to elucidate its function in Sn-rich (Sn : Pb = 6 : 4) perovskites...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650155/probing-interface-defects-in-top-gated-mos2-transistors-with-impedance-spectroscopy
#3
Peng Zhao, Angelica Azcatl, Yuri Y Gomeniuk, Pavel Bolshakov, Michael Schmidt, Stephen J McDonnell, Christopher L Hinkle, Paul K Hurley, Robert M Wallace, Chadwin Young
The electronic properties of the HfO2/MoS2 interface were investigated using multi-frequency capacitance-voltage (C-V) and current-voltage characterization of top gated MoS2 metal oxide semiconductor field effect transistors. The analysis was performed on few layer (5 - 10) MoS2 MOSFETs fabricated using photolithographic patterning with 13 nm and 8 nm HfO2 gate oxide layers formed by atomic layer deposition after in-situ UV-O3 surface functionalization. The impedance response of the HfO2/MoS2 gate stack indicates the existence of specific defects at the interface, which exhibited either a frequency dependent distortion similar to conventional Si MOSFETs with unpassivated silicon dangling bonds, or a frequency dispersion over the entire voltage range corresponding to depletion of the HfO2/MoS2 surface, consistent with interface traps distributed over a range of energy levels...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28649736/high-aspect-ratio-sub-micrometer-channels-using-wet-etching-application-to-the-dynamics-of-red-blood-cell-transiting-through-biomimetic-splenic-slits
#4
Priya Gambhire, Scott Atwell, Cécile Iss, Frédéric Bedu, Igor Ozerov, Catherine Badens, Emmanuèle Helfer, Annie Viallat, Anne Charrier
Nanoparticles delivering drugs, disseminating cancer cells, and red blood cells (RBCs) during splenic filtration must deform and pass through the sub-micrometer and high aspect ratio interstices between the endothelial cells lining blood vessels. The dynamics of passage of particles/cells through these slit-like interstices remain poorly understood because the in vitro reproduction of slits with physiological dimensions in devices compatible with optical microscopy observations requires expensive technologies...
June 26, 2017: Small
https://www.readbyqxmd.com/read/28649578/anti-high-mobility-group-box-1-antibody-ameliorates-albuminuria-in-mrl-lpr-lupus-prone-mice
#5
Haruki Watanabe, Katsue S Watanabe, Keyue Liu, Sumie Hiramatsu, Sonia Zeggar, Eri Katsuyama, Noriko Tatebe, Akiya Akahoshi, Fumiaki Takenaka, Takahisa Hanada, Masaru Akehi, Takanori Sasaki, Ken-Ei Sada, Eiji Matsuura, Masahiro Nishibori, Jun Wada
We evaluated the efficacy of a neutralizing anti-high mobility group box 1 (HMGB1) monoclonal antibody in MRL/lpr lupus-prone mice. The anti-HMGB1 monoclonal antibody (5 mg/kg weight) or class-matched control immunoglobulin G2a (IgG2a) was administered intravenously twice a week for 4-15 weeks. Urine albumin was monitored, and histological evaluation of the kidneys was conducted at 16 weeks. Lymphadenopathies were evaluated by 1-(2'-deoxy-2'-[(18)F]fluoro-β-D-arabinofuranosyl)cytosine ([(18)F]FAC) positron emission tomography/computed tomography (PET/CT) at 12 weeks...
September 15, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28649308/association-between-spirometry-controlled-chest-ct-scores-using-computer-animated-biofeedback-and-clinical-markers-of-lung-disease-in-children-with-cystic-fibrosis
#6
Thomas Kongstad, Kent Green, Frederik Buchvald, Marianne Skov, Tania Pressler, Kim Gjerum Nielsen
Background: Computed tomography (CT) of the lungs is the gold standard for assessing the extent of structural changes in the lungs. Spirometry-controlled chest CT (SCCCT) has improved the usefulness of CT by standardising inspiratory and expiratory lung volumes during imaging. This was a single-centre cross-sectional study in children with cystic fibrosis (CF). Using SCCCT we wished to investigate the association between the quantity and extent of structural lung changes and pulmonary function outcomes, and prevalence of known CF lung pathogens...
2017: European Clinical Respiratory Journal
https://www.readbyqxmd.com/read/28648541/coronary-artery-anomalies-in-patients-with-transposition-of-the-great-arteries-and-their-impact-on-postoperative-outcomes
#7
Maciej Moll, Krzysztof W Michalak, Katarzyna Sobczak-Budlewska, Jadwiga A Moll, Marek Kopala, Konrad Szymczyk, Paweł Dryżek, Jacek J Moll
BACKGROUND: Coronary anomalies are frequently present in children with transposition of the great arteries (TGA). Such anomalies significantly increase the complexity of arterial switch operations and may have an effect on postoperative outcomes. In this study, we aimed to assess the frequency of coronary anomalies in children with TGA and describe their effect on postoperative outcomes. METHODS: All patients with TGA who underwent an arterial switch operation between 1991 and 2015 were consecutively enrolled in this study...
June 22, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28647997/-endovascular-management-and-classification-of-the-dissecting-aneurysms-of-the-vertebral-artery
#8
Y Z Zang, Z G Wang, C W Wang, X Ding, X F Wang, L L Wang
Objective: To summarize the classifications and optimize endovascular treatment of the dissecting aneurysms of the vertebral artery (DAVA). Methods: The clinical information of 39 cases of DAVA treated with endovascular methods in our department between January 2007 and September 2016 were analyzed retrospectively.According to the location of the aneurysm in relation to the posterior inferior cerebellar artery (PICA), the aneurysms were classified into three types: type pre-PICA, located proximally to the PICA; type in-PICA, located at the PICA origin; and type post-PICA located distally to the PICA...
June 20, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28647127/infrared-light-detection-by-the-haller-s-organ-of-adult-american-dog-ticks-dermacentor-variabilis-ixodida-ixodidae
#9
Robert D Mitchell, Jiwei Zhu, Ann L Carr, Anirudh Dhammi, Grayson Cave, Daniel E Sonenshine, R Michael Roe
The Haller's organ (HO), unique to ticks and mites, is found only on the first tarsus of the front pair of legs. The organ has an unusual morphology consisting of an anterior pit (AP) with protruding sensilla and a posterior capsule (Cp). The current thinking is that the HO's main function is chemosensation analogous to the insect antennae, but the functionality of its atypical structure (exclusive to the Acari) is unexplained. We provide the first evidence that the HO allows the American dog tick, Dermacentor variabilis, to respond to infrared (IR) light...
June 13, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28646882/magnetic-foreign-body-ingestion-in-pediatric-patients-report-of-three-cases
#10
Jinbeom Cho, Kiyoung Sung, Dosang Lee
BACKGROUND: Although foreign bodies (FBs) typically pass spontaneously and uneventfully through the digestive tract, a subset of such bodies may become trapped, eventually leading to significant injury. In particular, the ingestion of magnetic materials can cause serious morbidity due to proximate attraction through the intestinal wall. CASE PRESENTATION: We recently treated three pediatric patients who had ingested several magnetic foreign materials. None of these patients exhibited any clinical symptoms or signs suggestive of surgical abdomen...
June 24, 2017: BMC Surgery
https://www.readbyqxmd.com/read/28646167/effectively-infinite-optical-path-length-created-using-a-simple-cubic-photonic-crystal-for-extreme-light-trapping
#11
Brian J Frey, Ping Kuang, Mei-Li Hsieh, Jian-Hua Jiang, Sajeev John, Shawn-Yu Lin
A 900 nm thick TiO2 simple cubic photonic crystal with lattice constant 450 nm was fabricated and used to experimentally validate a newly-discovered mechanism for extreme light-bending. Absorption enhancement was observed extending 1-2 orders of magnitude over that of a reference TiO2 film. Several enhancement peaks in the region from 600-950 nm were identified, which far exceed both the ergodic fundamental limit and the limit based on surface-gratings, with some peaks exceeding 100 times enhancement...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28644660/recoil-sensitive-lithium-interferometer-without-a-subrecoil-sample
#12
Kayleigh Cassella, Eric Copenhaver, Brian Estey, Yanying Feng, Chen Lai, Holger Müller
We report simultaneous conjugate Ramsey-Bordé interferometers with a sample of low-mass (lithium-7) atoms at 50 times the recoil temperature. We optically pump the atoms to a magnetically insensitive state using the 2S_{1/2}-2P_{1/2} line. Fast stimulated Raman beam splitters address a broad velocity class and unavoidably drive two conjugate interferometers that overlap spatially. We show that detecting the summed interference signals of both interferometers, using state labeling, allows recoil measurements and suppression of phase noise from vibrations...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644629/environmental-polymer-degradation-using-the-distonic-radical-ion-approach-to-study-the-gas-phase-reactions-of-model-polyester-radicals
#13
Bethany I Taggert, Richard A J O'Hair, Uta Wille
A novel precursor to the distonic O- and C-centred radical cations Oxo+O• and Oxo+C• was designed and synthesized, which represent model systems for radicals produced during polyester degradation. The precursor is equipped with a nitrate functional group, which serves as a masked site for these alkoxyl and carbon radicals that are unleashed through collision-induced dissociation (CID). Oxo+O• and Oxo+C• feature a cyclic carboxonium ion as permanent charge tag to enable monitoring their ion-molecule reactions on the millisecond to second timescale in the ion trap of the mass spectrometer...
June 23, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28644622/single-analyzer-neutral-loss-scans-in-a-linear-quadrupole-ion-trap-using-orthogonal-double-resonance-excitation
#14
Dalton T Snyder, R Graham Cooks
In this follow-up paper to our previous work on single analyzer precursor ion scans in a linear quadrupole ion trap (Snyder, D. T.; Cooks, R. G.; "Single analyzer precursor ion scans in a linear quadrupole ion trap using orthogonal double resonance excitation", J. Am. Soc. Mass Spectrom. accepted), we now report the development of single analyzer neutral loss scans in a linear quadrupole ion trap using orthogonal double resonance excitation. Methodologically, there are three key differences between single analyzer precursor ion scans and neutral loss scans under constant radiofrequency (rf) conditions: 1) in the latter experiment both excitation and ejection frequencies must be scanned, whereas in the former the ejection frequency is fixed, 2) the need to maintain a constant neutral loss while incrementing both precursor and product ion masses - complicated by the complex relationship between secular frequency and mass - requires use of two simultaneous frequency scans, both linear in mass, and 3) because the ejection frequency is scanned, a third ac signal occurring between the ac excitation and ac ejection frequency scans must also be applied and scanned in order to reject artifact peaks caused by ejection of unfragmented precursor ions...
June 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28643904/pth-1-34-induced-alterations-predispose-the-mandibular-condylar-cartilage-to-mineralization
#15
E H Dutra, M H O'Brien, T Gutierrez, A Lima, R Nanda, S Yadav
OBJECTIVE: To study the effects of intermittent parathyroid hormone (PTH [1-34]) on the mandibular condylar cartilage (MCC) and subchondral bone in adult female mice. MATERIALS AND METHODS: Twenty-two, 20-week-old female mice were used for in vivo experiments. The experimental mice (n=11) received daily intraperitoneal injections of PTH [1-34] for 3 weeks, while control mice (n=11) received intraperitoneal injections of 0.9% saline solution. Mice were euthanized and then micro-computed tomography (micro-CT); histology and immunostaining were carried out to assess the response...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28643701/self-anti-reflective-density-modulated-thin-films-by-hips-technique
#16
Filiz Keles, Emad O Badraddin, Tansel Karabacak
A critical factor for an efficient light harvesting device is reduced reflectance in order to achieve high optical absorptance. In this regard, refractive index engineering becomes important to minimize reflectance. In this study, a new fabrication approach to obtain the density-modulated CuInxGa(1-x)Se2 (CIGS) thin films with self-anti-reflective properties has been demonstrated. Density-modulated CIGS samples were fabricated by utilizing high pressure sputtering (HIPS) at Ar gas pressure of 2.75 x 10-2 mbar along with the conventional low pressure sputtering (LPS) at Ar gas pressure of 3...
June 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28643091/sylvatic-plague-vaccine-partially-protects-prairie-dogs-cynomys-spp-in-field-trials
#17
Tonie E Rocke, Daniel W Tripp, Robin E Russell, Rachel C Abbott, Katherine L D Richgels, Marc R Matchett, Dean E Biggins, Randall Griebel, Greg Schroeder, Shaun M Grassel, David R Pipkin, Jennifer Cordova, Adam Kavalunas, Brian Maxfield, Jesse Boulerice, Michael W Miller
Sylvatic plague, caused by Yersinia pestis, frequently afflicts prairie dogs (Cynomys spp.), causing population declines and local extirpations. We tested the effectiveness of bait-delivered sylvatic plague vaccine (SPV) in prairie dog colonies on 29 paired placebo and treatment plots (1-59 ha in size; average 16.9 ha) in 7 western states from 2013 to 2015. We compared relative abundance (using catch per unit effort (CPUE) as an index) and apparent survival of prairie dogs on 26 of the 29 paired plots, 12 with confirmed or suspected plague (Y...
June 22, 2017: EcoHealth
https://www.readbyqxmd.com/read/28642472/ambient-effects-on-electrical-characteristics-of-cvd-grown-monolayer-mos2-field-effect-transistors
#18
Jae-Hyuk Ahn, William M Parkin, Carl H Naylor, A T Charlie Johnson, Marija Drndić
Monolayer materials are sensitive to their environment because all of the atoms are at their surface. We investigate how exposure to the environment affects the electrical properties of CVD-grown monolayer MoS2 by monitoring electrical parameters of MoS2 field-effect transistors as their environment is changed from atmosphere to high vacuum. The mobility increases and contact resistance decreases simultaneously as either the pressure is reduced or the sample is annealed in vacuum. We see a previously unobserved, non-monotonic change in threshold voltage with decreasing pressure...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28640713/dispersal-hazards-of-pseudogymnoascus-destructans-by-bats-and-human-activity-at-hibernacula-in-summer
#19
Anne E Ballmann, Miranda R Torkelson, Elizabeth A Bohuski, Robin E Russell, David S Blehert
Bats occupying hibernacula during summer are exposed to Pseudogymnoascus destructans (Pd), the causative agent of white-nose syndrome (WNS), and may contribute to its dispersal. Furthermore, equipment and clothing exposed to cave environments are a potential source for human-assisted spread of Pd. To explore dispersal hazards for Pd during the nonhibernal season, we tested samples that were collected from bats, the environment, and equipment at hibernacula in the eastern US between 18 July-22 August 2012. Study sites included six hibernacula known to harbor bats with Pd with varying winter-count impacts from WNS and two hibernacula (control sites) without prior history of WNS...
June 22, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28640628/oriented-gold-nanorods-and-gold-nanorod-chains-within-smectic-liquid-crystal-topological-defects
#20
Brigita Rožič, Jérôme Fresnais, Celine Molinaro, Joseph Calixte, Shivakumar Umadevi, Stephanie Lau-Truong, Nordin Felidj, Tobias Kraus, Fabrice Charra, Vincent Dupuis, Torsten Hegmann, Celine Fiorini-Debuisschert, Bruno Gallas, Emmanuelle Lacaze
We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm(2) to around 6 GNRs/μm(2). We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks...
June 22, 2017: ACS Nano
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