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https://www.readbyqxmd.com/read/27925727/can-point-defects-in-surfaces-in-solution-be-atomically-resolved-by-atomic-force-microscopy
#1
Bernhard Reischl, Paolo Raiteri, Julian D Gale, Andrew L Rohl
While the atomic force microscope (AFM) is able to image mineral surfaces in solution with atomic resolution, so far, it has been a matter of debate whether imaging point defects is also possible under these conditions. The difficulties stem from the limited knowledge of what types of defects may be stable in the presence of an AFM tip, as well as from the complicated imaging mechanism involving interactions between hydration layers over the surface and around the tip apex. Here, we present atomistic molecular dynamics and free energy calculations of the AFM imaging of vacancies and ionic substitutions in the calcite (101[over ¯]4) surface in water, using a new silica AFM tip model...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27917475/tipping-points-curvilinear-associations-between-activity-level-and-mental-development-in-toddlers
#2
Megan Flom, Madeleine Cohen, Kimberly J Saudino
BACKGROUND: The Theory of Optimal Stimulation (Zentall & Zentall, Psychological Bulletin, 94, 1983, 446) posits that the relation between activity level (AL) and cognitive performance follows an inverted U shape where midrange AL predicts better cognitive performance than AL at the extremes. METHODS: We explored this by fitting linear and quadratic models predicting mental development from AL assessed via multiple methods (parent ratings, observations, and actigraphs) and across multiple situations (laboratory play, laboratory test, home) in over 600 twins (2- and 3-year olds)...
December 5, 2016: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/27917058/a-new-species-of-the-genus-calliaxina-ngoc-ho-2003-from-the-south-china-sea-crustacea-decapoda-axiidea-callianassidae
#3
REVIEW
Wenliang Liu, Xiaoli Liang
A new species of the genus Calliaxina Ngoc-Ho, 2003, Calliaxina xishaensissp. n., collected from the South China Sea is described and illustrated. It is distinguishable from Calliaxina thomassini Ngoc-Ho, 2014 by having the rostrum broadly triangular with pointed tip and is distinguishable from Calliaxina novaebritanniae (Borradaile, 1900) and Calliax punica (de Saint Laurent & Manning, 1982) by the posterior margin of telson being convex. It is also the first record of this genus from the China seas. A key to the species of Calliaxina is given...
2016: ZooKeys
https://www.readbyqxmd.com/read/27916363/tipping-the-scales-educating-surgeons-about-medical-malpractice
#4
Steven E Raper, Johncy Joseph, Wilda G Seymour, Patricia G Sullivan
BACKGROUND: In Pennsylvania, medical malpractice premiums are a major cost to surgeons. Yet surgeons often have little if any education in the basics of tort litigation or how to manage their risk. This work describes one approach for educating academic faculty surgeons on current concepts of medical malpractice and provide some guidance on how to "tip the scales of justice"; or minimize the risks of being named in a malpractice claim. MATERIALS AND METHODS: The course had five parts: the basics of medical malpractice, the cost of malpractice insurance, current departmental claims experience, strategies for decreasing the risk of being named in a claim, and an overview of malpractice reforms...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27910895/arabidopsis-thaliana-as-a-suitable-model-host-for-research-on-interactions-between-plant-and-foliar-nematodes-parasites-of-plant-shoot
#5
Dong-Wei Wang, Xiao-Fang Peng, Hui Xie, Chun-Ling Xu, De-Qiang Cheng, Jun-Yi Li, Wen-Jia Wu, Ke Wang
The rice white tip nematode (RWTN), Aphelenchoides besseyi and the chrysanthemum foliar nematode (CFN), Aphelenchoides ritzemabosi are migratory plant parasitic nematodes that infect the aboveground parts of plants. In this research, Arabidopsis thaliana was infected by RWTN and CFN under indoor aseptic cultivation, and the nematodes caused recognizable symptoms in the leaves. Furthermore, RWTN and CFN completed their life cycles and proliferated. Therefore, A. thaliana was identified as a new host of RWTN and CFN...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910794/have-we-reached-a-tipping-point-for-sugar-sweetened-beverage-taxes
#6
Kathryn Backholer, Miranda Blake, Stefanie Vandevijvere
No abstract text is available yet for this article.
December 2016: Public Health Nutrition
https://www.readbyqxmd.com/read/27909590/location-of-needle-tips-on-plexus-brachialis-in-different-supraclavicular-block-techniques-a-cadaver-study
#7
Senem Akpınar, Halil İbrahim Açar, Ayhan Cömert, Bülent Şam, Alaittin Elhan
OBJECTIVE: The present study was performed on cadavers to evaluate the efficacy of the different supraclavicular block techniques (Vongvises, Dalens, plumb-bob and inter-SCM) by investigating the location of the needle tip on the brachial plexus and to determine the most suitable block techniques according to the site of the surgery. METHODS: The study was performed on one embalmed and nine fresh cadavers. After the dissection, the skin of the cadavers was restored in its original position...
August 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27898479/the-effect-of-skin-pressure-on-needle-entry-point-accuracy-during-fluoroscopically-guided-lumbar-transforaminal-epidural-injections-a-randomized-clinical-trial
#8
Soon Young Yun, Duck Mi Yoon, Kyung Bong Yoon, Ji Ae Moon, Shin Hyung Kim
OBJECTIVE: The aim of this study was to investigate the effect of skin pressure on needle entry point accuracy during fluoroscopically guided lumbar transforaminal epidural injection. DESIGN: This study is a prospective randomized clinical trial; 64 patients with a body mass index of 25 kg/m or greater were enrolled. For patients in the pressing group, the operator marked the needle entry point on the patient's back while pressing the patient's skin with the tip of an indicator...
November 24, 2016: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/27898454/transvaginal-pelvic-floor-muscle-injection-technique-a-cadaver-study
#9
Priyanka Gupta, Michael Ehlert, Larry T Sirls, Kenneth Peters
INTRODUCTION: Women with pelvic floor dysfunction can have tender areas on vaginal examination, which can be treated with trigger-point injections. There are no publications to evaluate the accuracy of pelvic floor muscle injections. METHODS: Trigger-point injections were performed on 2 fresh cadaveric pelvises using a curved nasal cannula guide and 7-in spinal needle. This was performed using our standard template of 2 sets of injections at the 1-, 3-, and 5-o'clock positions distally and proximally...
November 28, 2016: Female Pelvic Medicine & Reconstructive Surgery
https://www.readbyqxmd.com/read/27896209/reference-points-suitable-for-evaluation-of-the-additional-arch-length-required-for-leveling-the-curve-of-spee
#10
Yong-Hwa Cho, Sung-Hoon Lim, Sung-Nam Gang
OBJECTIVE: The additional arch length required for leveling (AALL) the curve of Spee (COS) can be estimated by subtracting the two-dimensional (2D) arch circumference, which is the projection of the three-dimensional (3D) arch circumference onto the occlusal plane, from the 3D arch circumference, which represents the arch length after leveling the COS. The purpose of this study was to determine whether the cusp tips or proximal maximum convexities are more appropriate reference points for estimating the AALL...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27895681/rectal-separation-using-hydroxypropyl-methylcellulose-in-intracavitary-brachytherapy-of-cervical-cancer-an-innovative-approach
#11
Swapnendu Basu, Kazi Sazzad Manir, Abhishek Basu, Koushik Ghosh
PURPOSE: This study was initiated to prove feasibility of hydrogel application in recto-vaginal space in intracavitary brachytherapy (ICBT) of cervical cancer in order to reduce rectal toxicity. MATERIAL AND METHODS: In a case of stage IIB cervical cancer, after external beam radiotherapy (EBRT), we planned ICBT 7 Gy × 3 fractions. In 1(st) fraction (Plan 1), due to narrow separation between rectum and cervix (0.18 cm), only 5 Gy was delivered at point A (with high-risk clinical target volume [HR-CTV] D90 5...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27894853/concurrent-carpal-tunnel-syndrome-and-pronator-syndrome-a-retrospective-study-of-21-cases
#12
Chih-Wei Hsiao, Jui-Tein Shih, Sheng-Tsai Hung
PURPOSE: Concurrent carpal tunnel syndrome and pronator syndrome are rarely considered and the proximal compression sites are easily overlooked. We retrospectively studied 21 concurrent cases in our series from 2009 to 2015 and report the results. PATIENTS AND METHODS: The typical symptoms were pain, tingling, and numbness of the radial 3½ digits. If paresthesia involved the thenar eminence and proximal forearm pain was noted in cases of carpal tunnel syndrome, carpal tunnel syndrome combined with pronator syndrome was considered...
November 25, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27894788/neurotoxic-mechanisms-of-paclitaxel-are-local-to-the-distal-axon-and-independent-of-transport-defects
#13
Erica L Gornstein, Thomas L Schwarz
Chemotherapy-induced peripheral neuropathy (CIPN) is a dose-limiting side effect of paclitaxel and other chemotherapeutic agents. Paclitaxel binds and stabilizes microtubules, but the cellular mechanisms that underlie paclitaxel's neurotoxic effects are not well understood. We therefore used primary cultures of adult murine dorsal root ganglion neurons, the cell type affected in patients, to examine leading hypotheses to explain paclitaxel neurotoxicity. We address the role of microtubule hyperstabilization and its downstream effects...
November 26, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27894283/small-lung-lesions-invisible-under-fluoroscopy-are-located-accurately-by-three-dimensional-localization-technique-on-chest-wall-surface-and-performed-bronchoscopy-procedures-to-increase-diagnostic-yields
#14
Chaosheng Deng, Xiaoming Cao, Dawen Wu, Haibo Ding, Ruixiong You, Qunlin Chen, Linying Chen, Xin Zhang, Qiaoxian Zhang, Yongquan Wu
BACKGROUND: Nowadays, small peripheral pulmonary lesions (PPLs) are frequently detected and the prognosis of lung cancer depends on the early diagnosis. Because of the high fee and requiring specialized training, many advanced techniques are not available in many developing countries and rural districts. METHODS: Three sets of opaque soft copper wires visible under the fluoroscopy (Flu) in the Flu-flexible bronchoscopy (FB) group (n = 24), which determined the three planes of the lesion, were respectively placed firmly on the surface of the chest wall with adhesive tape on the chest wall...
November 29, 2016: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/27884494/consensus-conference-on-tips-management-techniques-indications-contraindications
#15
Stefano Fagiuoli, Raffaele Bruno, Wilma Debernardi Venon, Filippo Schepis, Francesco Vizzutti, Pierluigi Toniutto, Marco Senzolo, Paolo Caraceni, Francesco Salerno, Paolo Angeli, Roberto Cioni, Alessandro Vitale, Maurizio Grosso, Andrea De Gasperi, Gennaro D'Amico, Alfredo Marzano
The trans jugular intrahepatic Porto systemic shunt (TIPS) is no longer viewed as a salvage therapy or a bridge to liver transplantation and is currently indicated for a number of conditions related to portal hypertension with positive results in survival. Moreover, the availability of self-expandable polytetrafluoroethylene (PTFE)-covered endoprostheses has dramatically improved the long-term patency of TIPS. However, since the last updated International guidelines have been published (year 2009) new evidence have come, which have open the field to new indications and solved areas of uncertainty...
October 29, 2016: Digestive and Liver Disease
https://www.readbyqxmd.com/read/27881775/a-biophysical-model-for-cytotoxic-cell-swelling
#16
Koen Dijkstra, Jeannette Hofmeijer, Stephan A van Gils, Michel J A M van Putten
: We present a dynamic biophysical model to explain neuronal swelling underlying cytotoxic edema in conditions of low energy supply, as observed in cerebral ischemia. Our model contains Hodgkin-Huxley-type ion currents, a recently discovered voltage-gated chloride flux through the ion exchanger SLC26A11, active KCC2-mediated chloride extrusion, and ATP-dependent pumps. The model predicts changes in ion gradients and cell swelling during ischemia of various severity or channel blockage with realistic timescales...
November 23, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27879649/probabilistic-model-updating-for-sizing-of-hole-edge-crack-using-fiber-bragg-grating-sensors-and-the-high-order-extended-finite-element-method
#17
Jingjing He, Jinsong Yang, Yongxiang Wang, Haim Waisman, Weifang Zhang
This paper presents a novel framework for probabilistic crack size quantification using fiber Bragg grating (FBG) sensors. The key idea is to use a high-order extended finite element method (XFEM) together with a transfer (T)-matrix method to analyze the reflection intensity spectra of FBG sensors, for various crack sizes. Compared with the standard FEM, the XFEM offers two superior capabilities: (i) a more accurate representation of fields in the vicinity of the crack tip singularity and (ii) alleviation of the need for costly re-meshing as the crack size changes...
November 21, 2016: Sensors
https://www.readbyqxmd.com/read/27879119/on-the-mathematical-modelling-of-tumor-induced-angiogenesis
#18
Luis L Bonilla, Vincenzo Capasso, Mariano Alvaro, Manuel Carretero, Filippo Terragni
An angiogenic system is taken as an example of extremely complex ones in the field of Life Sciences, from both analytical and computational points of view, due to the strong coupling between the kinetic parameters of the relevant branching - growth - anastomosis stochastic processes of the capillary network, at the microscale, and the family of interacting underlying biochemical fields, at the macroscale. To reduce this complexity, for a conceptual stochastic model we have explored how to take advantage of the system intrinsic multiscale structure: one might describe the stochastic dynamics of the cells at the vessel tip at their natural microscale, whereas the dynamics of the underlying fields is given by a deterministic mean field approximation obtained by an averaging at a suitable mesoscale...
February 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27870844/raman-spectroscopy-tipping-point
#19
Guillaume Goubert, Richard P Van Duyne
No abstract text is available yet for this article.
November 21, 2016: Nature Nanotechnology
https://www.readbyqxmd.com/read/27869841/endlessly-single-mode-photonic-crystal-fiber-as-a-high-resolution-probe
#20
Heli Valtna-Lukner, Jaagup Repän, Sandhra-Mirella Valdma, Peeter Piksarv
We sample ultra-broadband light, focused onto a diffraction-limited spot, to an endlessly single-mode photonic crystal fiber (ESM) and detect both the field amplitude and phase using a SEA TADPOLE interferometer. We resolve spatial features up to 2.5 times finer than the fiber mode size while sampling the periodic features of the bipolar oscillating field in the transverse section. The resolution enhancement is expected also in other types of single-mode fibers in intensity measurements and leads to an inexpensive method for characterizing the point-spread function of such optical fields, e...
November 20, 2016: Applied Optics
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