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https://www.readbyqxmd.com/read/28339246/impact-of-atomic-scale-contact-geometry-on-andreev-reflection
#1
J Brand, P Ribeiro, N Néel, S Kirchner, J Kröger
Charge transport has been examined in junctions comprising the normal-metal tip of a low-temperature scanning tunneling microscope, the surface of a conventional superconductor, and adsorbed C_{60} molecules. The Bardeen-Cooper-Schrieffer energy gap gradually evolves into a zero-bias peak with decreasing electrode separation. The peak is assigned to the spectroscopic signature of Andreev reflection. The conductance due to Andreev reflection is determined by the atomic termination of the tip apex and the molecular adsorption orientation...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28337534/intermediate-osteotomies-in-rhinoplasty-a-new-perspective
#2
Diogo Pereira Nunes, Catarina Tinoco, Diogo Oliveira E Carmo, João Paço
The nasal dorsum framework plays a major role in nasal and facial harmony. This study presents a new approach to an already known technique, intermediate osteotomies, which can be used routinely in patients with cosmetically unpleasant changes in eyebrow-tip line features, allowing the acquisition of a natural, aesthetically agreeable and harmonious dorsum contour, while preserving nasal function. The approach was evaluated retrospectively in 50 consecutive patients at a tertiary referral hospital. Patients were asked to complete a survey to rate their satisfaction with the cosmetic outcome on a 5-point visual analog scale (VAS) and to compare the impact of nasal obstruction on their quality of life, pre- and postoperatively, by completing the validated Nasal Obstruction Symptom Evaluation (NOSE) scale...
March 23, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28336684/brachycephalic-tipping-point-time-to-push-the-button
#3
Adele Waters
No abstract text is available yet for this article.
March 25, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28335998/point-shear-wave-elastography-to-evaluate-and-monitor-changing-portal-venous-pressure-in-patients-with-decompensated-cirrhosis
#4
Hao Han, Jian Yang, Yu-Zheng Zhuge, Ming Zhang, Min Wu
This study evaluated whether the stiffness of the liver and spleen, measured using the point shear wave elastography (pSWE) technique, correlates with portal venous pressure (PVP) and whether the result extends to estimate the diminishing change in PVP (ΔPVP) in patients with decompensated cirrhosis. We evaluated the data of 67 prospectively enrolled patients who underwent both transjugular intrahepatic portosystemic shunt (TIPS) and pSWE. The stiffness of liver and spleen were evaluated by measuring shear wave velocity (SWV) to determine the statistical correlation with PVP...
March 20, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28330714/rapid-maxillary-expansion-in-mouth-breathers-a-short-term-skeletal-and-soft-tissue-effect-on-the-nose
#5
Fauze Ramez Badreddine, Reginaldo R Fujita, Fabio Eduardo Maiello Monteiro Alves, Mario Cappellette
INTRODUCTION: Rapid maxillary expansion (RME) can change the form and function of the nose. The skeletal and soft tissue changes can influence the esthetics and the stability of the results obtained by the RME. OBJECTIVE: The aim of this retrospective study was to evaluate the short-term effects of RME on the skeletal and soft tissue structures of the nose, in mouth-breathing patients, using a reliable and reproducible, but simple methodology, with the aid of computed tomography...
February 24, 2017: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28328885/introducing-therioepistemology-the-study-of-how-knowledge-is-gained-from-animal-research
#6
REVIEW
Joseph P Garner, Brianna N Gaskill, Elin M Weber, Jamie Ahloy-Dallaire, Kathleen R Pritchett-Corning
This focus issue of Lab Animal coincides with a tipping point in biomedical research. For the first time, the scale of the reproducibility and translatability crisis is widely understood beyond the small cadre of researchers who have been studying it and the pharmaceutical and biotech companies who have been living it. Here we argue that an emerging literature, including the papers in this focus issue, has begun to congeal around a set of recurring themes, which themselves represent a paradigm shift. This paradigm shift can be characterized at the micro level as a shift from asking "what have we controlled for in this model?" to asking "what have we chosen to ignore in this model, and at what cost?" At the macro level, it is a shift from viewing animals as tools (the furry test tube), to viewing them as patients in an equivalent human medical study...
March 22, 2017: Lab Animal
https://www.readbyqxmd.com/read/28318949/wing-augmentation-reduces-femoral-head-cutting-out-of-dynamic-hip-screw
#7
Chih-Yu Chen, Shu-Wei Huang, Jui-Sheng Sun, Shin-Yiing Lin, Chih-Sheng Yu, Hsu-Pin Pan, Ping-Hung Lin, Fan-Chun Hsieh, Yang-Hwei Tsuang, Feng-Huei Lin, Rong-Sen Yang, Cheng-Kung Cheng
The dynamic hip screw (DHS) is commonly used in the treatment of femoral intertrochanteric fracture with high satisfactory results. However, post-operative failure does occur and result in poor prognosis. The most common failure is femoral head varus collapse, followed by lag screw cut-out through the femoral head. In this study, a novel-designed DHS with two supplemental horizontal blades was used to improve the fixation stability. In this study, nine convention DHS and 9 Orthopaedic Device Research Center (ODRC) DHSs were tested in this study...
March 17, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28316390/sem-studies-on-acanthocephalan-parasite-echinorhynchus-veli-infecting-the-fish-synaptura-orientalis-bl-sch-1801
#8
S H Sheema, M V John, P V George
Echinorhynchus veli (George and Nadakal, 1978), an acanthocephalid worm infesting the estuarine flat fish, Synaptura orientalis, was collected from the Veli lake, Kerala. The parasite was recovered from the intestine of the host fish. The detailed surface morphology was studied with the help of scanning electron microscope. The study revealed a cylindrical, medially swollen proboscis with a flat apex, backward directed hooks, each with smooth surface, broad base, pointed tip and an epidermal elevation at the point of insertion...
March 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28304284/scanning-gate-microscopy-of-magnetic-focusing-in-graphene-devices-quantum-vs-classical-simulation
#9
Marko D Petrović, Slaviša Milovanović, Francois Peeters
We compare classical versus quantum electron transport in recently investigated magnetic focusing devices [S. Bhandari et al., Nano Lett. 16, 1690 (2016)] exposed to the perturbing potential of a scanning gate microscope (SGM). Using the Landauer-Büttiker formalism for a multi-terminal device, we calculate resistance maps that are obtained as the SGM tip is scanned over the sample. There are three unique regimes in which the scanning tip can operate (focusing, repelling, and mixed regime) which are investigated...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28301310/glass-fiber-based-mr-safe-guidewire-for-mr-imaging-guided-endovascular-interventions-in-vitro-and-preclinical-in-vivo-feasibility-study
#10
Alexander Massmann, Arno Buecker, Guenther K Schneider
Purpose To evaluate glass-fiber-based guidewires that are safe for magnetic resonance (MR) imaging-guided endovascular interventions by using a phantom and an in vivo swine model. Materials and Methods MR imaging-safe guidewires were made from micropultruded glass and/or aramid fibers and epoxy resin with diameters of 0.89 mm (0.035 inch) for standard and stiff guidewires and 0.36 mm (0.014 inch) for micro guidewires. MR imaging visibility and mechanical properties were assessed in a pulsatile flow model. After approval was obtained from the institutional animal care and use committee, MR imaging guidewires were evaluated for standard endovascular procedures in nine pigs...
March 14, 2017: Radiology
https://www.readbyqxmd.com/read/28300963/foot-length-measurements-of-newborns-of-high-and-low-risk-pregnancies
#11
Ana Karina Marques Salge, Érika Lopes Rocha, Maria Aparecida Munhoz Gaíva, Thaíla Correa Castral, Janaína Valadares Guimarães, Raphaela Maioni Xavier
OBJECTIVE: Comparing foot length measurements of newborns in high and low risk pregnancies at a public hospital in Goiânia, GO, Brazil. METHOD: A cross-sectional study carried out between April, 2013 and May, 2015, with a sample consisting of 180 newborns; 106 infants of women from high-risk pregnancies and 74 of women from low-risk pregnancies. Data were descriptively analyzed. Foot length measurement was performed using a stiff transparent plastic ruler, graduated in millimeters...
March 9, 2017: Revista da Escola de Enfermagem da U S P
https://www.readbyqxmd.com/read/28298982/elongated-styloid-process-evaluation-on-digital-panoramic-radiograph-in-a-north-italian-population
#12
Antonio Gracco, Alberto De Stefani, Giovanni Bruno, Paolo Balasso, Giulio Alessandri-Bonetti, Edoardo Stellini
BACKGROUND: The aim of this study is to evaluate the prevalence of elongated styloid process in digital panoramic radiographs in a North Italian population in relation to age, gender and side. MATERIAL AND METHODS: This study was performed as a retrospective analysis on digital panoramic radiographs of 600 (271 males and 329 females) Italian patients between 6 and 87 years old. The styloid process length were measured using the measuring tool of Sidexis Software...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28298944/4-point-ultrasonography-to-confirm-the-correct-position-of-the-nasogastric-tube-in-114-critically-ill-patients
#13
Marianna Zatelli, Norberto Vezzali
PURPOSE: Nasogastric feeding tube is routinely positioned in intensive care units. The complications of misplacement are rare but very dangerous for the patients. The aim of this study is to estimate the diagnostic accuracy of this new technique, 4-point ultrasonography to confirm nasogastric tube placement in intensive care. METHODS: One hundred fourteen critical ill patients monitored in ICU were included. The intensivist provided in real time to perform the exam in four steps: sonography from either the right or left side of the patient's neck to visualize the esophagus, sonography of epigastrium to confirm the passage through the esophagogastric junction and the positioning in antrum, sonography of the fundus...
March 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28297319/modeling-the-agility-mlc-in-the-monaco-treatment-planning-system
#14
Michael Snyder, Robert Halford, Cory Knill, Jeffrey N Adams, Todd Bossenberger, Adrian Nalichowski, Ahmad Hammoud, Jay Burmeister
We investigate the relationship between the various parameters in the Monaco MLC model and dose calculation accuracy for an Elekta Agility MLC. The vendor-provided MLC modeling procedure - completed first with external vendor participation and then exclusively in-house - was used in combination with our own procedures to investigate several sets of MLC modeling parameters to determine their effect on dose distributions and point-dose measurements. Simple plans provided in the vendor procedure were used to elucidate specific mechanical characteristics of the MLC, while ten complex treatment plans - five IMRT and five VMAT - created using TG-119-based structure sets were used to test clinical dosimetric effects of particular parameter choices...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296940/direct-measurement-of-interaction-forces-between-bovine-serum-albumin-and-poly-ethylene-oxide-in-water-and-electrolyte-solutions
#15
Sergio M Acuña, José M Bastías, Pedro G Toledo
The net interaction between a probe tip coated with bovine serum albumin (BSA) protein and a flat substrate coated with poly(ethylene oxide) (PEO) polymer was measured directly on approach in water and electrolyte solutions using AFM. The approach force curve between the two surfaces was monotonically repulsive in water and in electrolyte solutions. At pH ~5, slightly above the isoelectric point (pI) of BSA, and at large distances, the force was dominated by electrostatic repulsion between the oxygen atoms of the incoming protein with those belonging to the ether groups of PEO...
2017: PloS One
https://www.readbyqxmd.com/read/28295921/earlier-and-greater-hand-pre-shaping-in-the-elderly-a-study-based-on-kinematic-analysis-of-reaching-movements-to-grasp-objects
#16
Yoshiki Tamaru, Yasuo Naito, Takashi Nishikawa
BACKGROUND: Elderly people are less able to manipulate objects skilfully than young adults. Although previous studies have examined age-related deterioration of hand movements with a focus on the phase after grasping objects, the changes in the reaching phase have not been studied thus far. We aimed to examine whether changes in hand shape patterns during the reaching phase of grasping movements differ between young adults and the elderly. METHODS: Ten healthy elderly adults and 10 healthy young adults were examined using the Simple Test for Evaluating Hand Functions and kinetic analysis of hand pre-shaping reach-to-grasp tasks...
March 9, 2017: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/28295087/high-numerical-aperture-na%C3%A2-%C3%A2-0-92-objective-lens-for-imaging-and-addressing-of-cold-atoms
#17
Carsten Robens, Stefan Brakhane, Wolfgang Alt, Felix Kleißler, Dieter Meschede, Geol Moon, Gautam Ramola, Andrea Alberti
We have designed, built, and characterized a high-resolution objective lens that is compatible with an ultrahigh vacuum environment. The lens system exploits the principle of the Weierstrass sphere solid immersion lens to reach a numerical aperture (NA) of 0.92. Tailored to the requirements of optical lattice experiments, the objective lens features a relatively long working distance of 150 μm. Our two-lens design is remarkably insensitive to mechanical tolerances in spite of the large NA. Additionally, we demonstrate the application of a tapered optical fiber tip, as used in scanning near-field optical microscopy, to measure the point spread function (PSF) of a high NA optical system...
March 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28294193/characteristics-of-ferroelectric-ferroelastic-domains-in-n%C3%A3-el-type-skyrmion-host-gav4s8
#18
Ádám Butykai, Sándor Bordács, István Kézsmárki, Vladimir Tsurkan, Alois Loidl, Jonathan Döring, Erik Neuber, Peter Milde, Susanne C Kehr, Lukas M Eng
GaV4S8 is a multiferroic semiconductor hosting Néel-type magnetic skyrmions dressed with electric polarization. At Ts = 42 K, the compound undergoes a structural phase transition of weakly first-order, from a non-centrosymmetric cubic phase at high temperatures to a polar rhombohedral structure at low temperatures. Below Ts, ferroelectric domains are formed with the electric polarization pointing along any of the four 〈111〉 axes. Although in this material the size and the shape of the ferroelectric-ferroelastic domains may act as important limiting factors in the formation of the Néel-type skyrmion lattice emerging below TC = 13 K, the characteristics of polar domains in GaV4S8 have not been studied yet...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28290917/evaluation-of-receiver-stimulator-migration-in-cochlear-implantation-using-the-subperiosteal-pocket-technique-a-prospective-clinical-study
#19
Y Güldiken, B Polat, N Enver, L Aydemir, Ş Çomoğlu, K S Orhan
OBJECTIVE: This study aimed to evaluate migration of the receiver-stimulator after cochlear implantation using the subperiosteal pocket technique. METHODS: A prospective clinical study was performed of 32 paediatric patients (aged between 12 months and 8 years; mean ± standard deviation, 28 ± 19 months) who underwent cochlear implantation in tertiary referral centres. The degree of migration was evaluated using measurements between the receiver-stimulator and selected reference points: the lateral canthus, tragus and mastoid tip...
March 14, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28290556/porewater-methane-transport-within-the-gas-vesicles-of-diurnally-migrating-chaoborus-spp-an-energetic-advantage
#20
Daniel F McGinnis, Sabine Flury, Kam W Tang, Hans-Peter Grossart
Diurnally-migrating Chaoborus spp. reach populations of up to 130,000 individuals m(-2) in lakes up to 70 meters deep on all continents except Antarctica. Linked to eutrophication, migrating Chaoborus spp. dwell in the anoxic sediment during daytime and feed in the oxic surface layer at night. Our experiments show that by burrowing into the sediment, Chaoborus spp. utilize the high dissolved gas partial pressure of sediment methane to inflate their tracheal sacs. This mechanism provides a significant energetic advantage that allows the larvae to migrate via passive buoyancy rather than more energy-costly swimming...
March 14, 2017: Scientific Reports
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