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https://www.readbyqxmd.com/read/28327465/anomalous-rashba-spin-orbit-interaction-in-electrically-controlled-topological-insulator-based-on-inn-gan-quantum-wells
#1
S P Lepkowski, Witold Bardyszewski
We study theoretically the topological phase transition and the Rashba spin-orbit interaction in electrically biased InN/GaN quantum wells. We show that that for properly chosen widths of quantum wells and barriers, one can effectively tune the system through the topological phase transition applying an external electric field perpendicular to the QW plane. We find that in InN/GaN quantum wells with the inverted band structure, when the conduction band s-type level is below the heavy hole and light hole p-type levels, the spin splitting of the subbands decreases with increasing the amplitude of the electric field in the quantum wells, which reveals the anomalous Rashba effect...
March 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28322232/hierarchical-on-surface-synthesis-and-electronic-structure-of-carbonyl-functionalized-one-and-two-dimensional-covalent-nanoarchitectures
#2
Christian Steiner, Julian Gebhardt, Maximilian Ammon, Zechao Yang, Alexander Heidenreich, Natalie Hammer, Andreas Görling, Milan Kivala, Sabine Maier
The fabrication of nanostructures in a bottom-up approach from specific molecular precursors offers the opportunity to create tailored materials for applications in nanoelectronics. However, the formation of defect-free two-dimensional (2D) covalent networks remains a challenge, which makes it difficult to unveil their electronic structure. Here we report on the hierarchical on-surface synthesis of nearly defect-free 2D covalent architectures with carbonyl-functionalized pores on Au(111), which is investigated by low-temperature scanning tunnelling microscopy in combination with density functional theory calculations...
March 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28321128/continuous-wave-lasing-in-colloidal-quantum-dot-solids-enabled-by-facet-selective-epitaxy
#3
Fengjia Fan, Oleksandr Voznyy, Randy P Sabatini, Kristopher T Bicanic, Michael M Adachi, James R McBride, Kemar R Reid, Young-Shin Park, Xiyan Li, Ankit Jain, Rafael Quintero-Bermudez, Mayuran Saravanapavanantham, Min Liu, Marek Korkusinski, Pawel Hawrylak, Victor I Klimov, Sandra J Rosenthal, Sjoerd Hoogland, Edward H Sargent
Colloidal quantum dots (CQDs) feature a low degeneracy of electronic states at the band edges compared with the corresponding bulk material, as well as a narrow emission linewidth. Unfortunately for potential laser applications, this degeneracy is incompletely lifted in the valence band, spreading the hole population among several states at room temperature. This leads to increased optical gain thresholds, demanding high photoexcitation levels to achieve population inversion (more electrons in excited states than in ground states-the condition for optical gain)...
March 20, 2017: Nature
https://www.readbyqxmd.com/read/28319605/evaluation-of-esophagitis-using-endoscopic-narrow-band-imaging
#4
Amber McClain, Catalina Jaramillo, Raza A Patel, Jacob Robson
No abstract text is available yet for this article.
March 17, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28319178/inter-nesting-movements-and-habitat-use-of-adult-female-kemp-s-ridley-turtles-in-the-gulf-of-mexico
#5
Donna J Shaver, Kristen M Hart, Ikuko Fujisaki, David Bucklin, Autumn R Iverson, Cynthia Rubio, Thomas F Backof, Patrick M Burchfield, Raul de Jesus Gonzales Diaz Miron, Peter H Dutton, Amy Frey, Jaime Peña, Daniel Gomez Gamez, Hector J Martinez, Jaime Ortiz
Species vulnerability is increased when individuals congregate in restricted areas for breeding; yet, breeding habitats are not well defined for many marine species. Identification and quantification of these breeding habitats are essential to effective conservation. Satellite telemetry and switching state-space modeling (SSM) were used to define inter-nesting habitat of endangered Kemp's ridley turtles (Lepidochelys kempii) in the Gulf of Mexico. Turtles were outfitted with satellite transmitters after nesting at Padre Island National Seashore, Texas, USA, from 1998 through 2013 (n = 60); Rancho Nuevo, Tamaulipas, Mexico, during 2010 and 2011 (n = 11); and Tecolutla, Veracruz, Mexico, during 2012 and 2013 (n = 11)...
2017: PloS One
https://www.readbyqxmd.com/read/28318065/ultra-narrow-low-bandgap-graphene-nanoribbons-from-bromoperylenes-synthesis-and-terahertz-spectroscopy
#6
Daniel Jänsch, Ivan Ivanov, Yulian Zagranyarski, Ivana Duznovic, Martin Baumgarten, Dimitry Turchinovich, Chen Li, Mischa Bonn, Klaus Müllen
Soluble ultra-narrow armchair graphene nanoribbons (AGNRs) with length of ≈20 nm and completely fused cores exceeding 5 nm in length, pronounced near-infrared (NIR) absorption up to 1400 nm, and a low band gap (≈0.9 eV) are synthesized from 3,9(3,10)-dibromoperylene and 3,4,9,10-tetrabromoperylene. Since the monomers are obtained from perylene carboxyanhydrides, a remarkable link between dye and graphene chemistry is established. The two-step protocol for the AGNR synthesis by aryl-aryl coupling and subsequent cyclodehydrogenation is compared with a direct Yamamoto polymerization...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28317522/skin-cancer-risk-nonmelanoma-skin-cancers-melanoma-in-vitiligo-patients
#7
REVIEW
Michelle Rodrigues
The relative genetic and immune protection against melanoma and nonmelanoma skin cancers in those with vitiligo is reassuring. The results of recent studies allow us to be cautiously optimistic when discussing the risk of skin cancer caused by therapeutic exposure to narrow-band ultraviolet B light. However, we should continue to recommend sun protection at all other times to avoid burning in vitiliginous skin and to decrease incidental ultraviolet exposure. It is also important to perform full skin checks regularly in light of the prolonged courses of phototherapy required to repigment vitiliginous skin and maintain repigmentation thereafter...
April 2017: Dermatologic Clinics
https://www.readbyqxmd.com/read/28317452/recent-advances-in-diagnostic-testing-for-gastroesophageal-reflux-disease
#8
Rishi D Naik, Michael F Vaezi
Gastroesophageal reflux disease (GERD) has a large economic burden with important complications that include esophagitis, Barrett's esophagus, and adenocarcinoma. Despite endoscopy, validated patient questionnaires, and traditional ambulatory pH monitoring, the diagnosis of GERD continues to be challenging. Areas covered: This review will explore the difficulties in diagnosing GERD with a focus on new developments, ranging from basic fundamental changes (histology and immunohistochemistry) to direct patient care (narrow-band imaging, impedance, and response to anti-reflux surgery)...
March 20, 2017: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28301723/revealing-the-electronic-structure-of-silicon-intercalated-armchair-graphene-nanoribbons-by-scanning-tunneling-spectroscopy
#9
Okan Deniz, Carlos Sanchez Sanchez, Tim Dumslaff, Xinliang Feng, Akimitsu Narita, Klaus Müllen, Neerav Kharche, Vincent Meunier, Roman Fasel, Pascal Ruffieux
The electronic properties of graphene nanoribbons grown on metal substrates are significantly masked by the ones of the supporting metal surface. Here, we introduce a novel approach to access the frontier states of armchair graphene nanoribbons (AGNRs). The in situ intercalation of Si at the AGNR/Au(111) interface through surface alloying suppresses the strong contribution of the Au(111) surface state and allows for an unambiguous determination of the frontier electronic states of both wide and narrow band gap AGNRs...
March 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28300860/annular-elastolytic-giant-cell-granuloma-successfully-treated-with-adalimumab-subsequently-complicated-by-drug-induced-lupus
#10
Adele Haimovic, Hideko Kamino, David E Cohen
We report a 51-year-old female with a 3-year history of recalcitrant annular elastolytic giant cell granuloma (AEGCG) who was effectively treated with the anti-tumor necrosis factor (TNF)-alpha antibody, adalimumab. Her disease was refractory to topical glucocorticoids, intralesional glucocorticoids, narrow-band ultraviolet light (UV)-B phototherapy and cyclosporine. During her treatment with adalimumab she developed a positive anti-nuclear-antibody and double-stranded-DNA antibody and her treatment was terminated...
February 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28300270/k8ce2i18o53-a-novel-potassium-cerium-iv-iodate-with-enhanced-visible-light-driven-photocatalytic-activity-resulting-from-polar-zero-dimensional-ce-io3-8-4-units
#11
Ruofei Wu, Xingxing Jiang, Mingjun Xia, Lijuan Liu, Xiaoyang Wang, Zheshuai Lin, Chuangtian Chen
Hydrothermally grown iodate, K8Ce2I18O53, featuring polar 0D [Ce(IO3)8](4-) units, has shown the highest visible light driven (VLD) photocatalytic activity in metal iodates reported before. The enhanced VLD photocatalytic property results from a synergistic effect between the narrow band gap and polar 0D [Ce(IO3)8](4-) units, as confirmed using first principles calculations.
March 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28295627/second-local-recurrence-with-advanced-rectal-cancer-after-salvage-emr-of-local-recurrence-following-initial-cold-polypectomy
#12
Motohiko Kato, Junichi Shiraishi, Toshio Uraoka
A 60-year-old woman underwent colonoscopy for a positive fecal immunochemical test. A 5 mm sessile polyp (Paris type 0-Isp) was found in the lower rectum (Figure 1a). This polyp was diagnosed as a low-grade adenoma based on findings of magnification colonoscopy with narrow band imaging (Figure 1b) and then was resected in a single piece with cold snare polypectomy. This article is protected by copyright. All rights reserved.
March 14, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28293023/advances-in-image-enhancement-in-colonoscopy-for-detection-of-adenomas
#13
REVIEW
Takahisa Matsuda, Akiko Ono, Masau Sekiguchi, Takahiro Fujii, Yutaka Saito
High-quality colonoscopy is mandatory to prevent adenoma recurrence and colorectal cancer. In the past few years, technical advances have been developed with the purpose of improving adenoma detection rate (ADR), one of the most important validated colonoscopy quality benchmarks. Several techniques or devices are used to optimize visualization: observation techniques; add-on devices; auxiliary imaging devices; colonoscopes with increased field of view; and colonoscopes with an integrated inflatable reusable balloon...
March 15, 2017: Nature Reviews. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28288013/new-developments-in-surgery-for-endometriosis-and-pelvic-pain
#14
Thanh Ha Luu, M Jean Uy-Kroh
Endometriosis is a common disease affecting reproductive age women. Pain is one of the most common symptoms associated with endometriosis. When medical therapy has failed or in known deeply infiltrating endometriosis, surgical management is warranted. Laparoscopy is the gold standard for diagnosis and treatment of endometriosis. Recent developments in surgery have shown the feasibility of robotic surgery for endometriosis, although these methods have not been shown to be superior to conventional laparoscopy...
March 10, 2017: Clinical Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28283788/follow-up-of-oral-and-oropharyngeal-cancer-using-narrow-band-imaging-and-high-definition-television-with-rigid-endoscope-to-obtain-an-early-diagnosis-of-second-primary-tumors-a-prospective-study
#15
Giancarlo Tirelli, Marco Piovesana, Pierluigi Bonini, Annalisa Gatto, Giuseppe Azzarello, Francesca Boscolo Nata
Narrow-band imaging (NBI) is an optical technique enhancing mucosal vasculature. The aim of this study is to assess the effectiveness of rigid NBI endoscopy in the early detection of second primaries or local recurrences after treatment for oral (OSCC) and oropharyngeal squamous cell carcinoma (OPSCC), its advantage over standard white-light (WL) endoscopy, and the influence of previous radiotherapy, the learning curve, and lesion site. Between January 2013 and June 2015, 195 patients treated for OSCC or OPSCC with surgery alone (group A) or radiotherapy with or without surgery and/or chemotherapy (group B) underwent additional follow-up assessments using NBI...
March 10, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28282341/new-developments-in-the-management-of-nonmuscle-invasive-bladder-cancer
#16
Mark D Tyson, Daniel Lee, Peter Clark
PURPOSE OF REVIEW: In this review, we summarize the core principles in the management of nonmuscle invasive bladder cancer (NMIBC) with an emphasis on new developments that have emerged over the last year. RECENT FINDINGS: NMIBC has a propensity to recur and progress. Risk stratification has facilitated appropriate patient selection for treatment but improved tools, including biomarkers, are still needed. Enhanced cystoscopy with photodynamic imaging and narrow band imaging show promise for diagnosis, risk stratification, and disease monitoring and has been formally recommended this year by the American Urological Association...
March 9, 2017: Current Opinion in Oncology
https://www.readbyqxmd.com/read/28282189/harnessing-geometric-frustration-to-form-band-gaps-in-acoustic-channel-lattices
#17
Pai Wang, Yue Zheng, Matheus C Fernandes, Yushen Sun, Kai Xu, Sijie Sun, Sung Hoon Kang, Vincent Tournat, Katia Bertoldi
We demonstrate both numerically and experimentally that geometric frustration in two-dimensional periodic acoustic networks consisting of arrays of narrow air channels can be harnessed to form band gaps (ranges of frequency in which the waves cannot propagate in any direction through the system). While resonant standing wave modes and interferences are ubiquitous in all the analyzed network geometries, we show that they give rise to band gaps only in the geometrically frustrated ones (i.e., those comprising of triangles and pentagons)...
February 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28281332/tightly-bound-double-caged-60-fullerene-derivatives-with-enhanced-solubility-structural-features-and-application-in-solar-cells
#18
Victor A Brotsman, Vitaliy A Ioutsi, Alexey V Rybalchenko, Vitaliy Yu Markov, Nikita M Belov, Natalia S Lukonina, Sergey I Troyanov, Ilya N Ioffe, Vasiliy A Trukhanov, Galina K Galimova, Artur A Mannanov, Dmitry N Zubov, Erhard Kemnitz, Lev N Sidorov, Tatiana V Magdesieva, Dmitry Yu Paraschuk, Alexey A Goryunkov
A series of novel highly soluble double-caged [60]fullerene derivatives were prepared by means of lithium salt-assisted [2+3]-cycloaddition. The bispheric molecules feature rigid linking of the fullerene spheres via a four-membered cycle and a pyrrolizidine bridge with an ester function CO2R (R=n-decyl, n-octadecyl, benzyl, and n-butyl: compounds 1a-d, respectively), as demonstrated by NMR spectroscopy and X-ray diffraction. Cyclic voltammetry studies revealed three closely overlapping pairs of reversible peaks due to consecutive one-electron reductions of fullerene cages, as well as an irreversible oxidation peak attributed to abstraction of an electron from the nitrogen lone electron pair...
March 9, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28275908/narrow-band-imaging-enhances-the-detection-rate-of-penetration-and-aspiration-in-fees
#19
Julie C Nienstedt, Frank Müller, Almut Nießen, Susanne Fleischer, Jana-Christiane Koseki, Till Flügel, Christina Pflug
Narrow band imaging (NBI) is widely used in gastrointestinal, laryngeal, and urological endoscopy. Its original purpose was to visualize vessels and epithelial irregularities. Based on our observation that adding NBI to common white light (WL) improves the contrast of the test bolus in fiberoptic endoscopic evaluation of swallowing (FEES), we now investigated the potential value of NBI in swallowing disorders. 148 FEES images were analyzed from 74 consecutive patients with swallowing disorders, including 74 with and 74 without NBI...
March 9, 2017: Dysphagia
https://www.readbyqxmd.com/read/28275307/effects-of-hydrotalcite-combined-with-esomeprazole-on-gastric-ulcer-healing-quality-a-clinical-observation-study
#20
Rui-Qi Yang, Hua Mao, Li-Yun Huang, Pei-Zhu Su, Min Lu
AIM: To evaluate the effects of hydrotalcite combined with esomeprazole on gastric ulcer healing quality. METHODS: Forty-eight patients diagnosed with gastric ulcer between June 2014 and February 2016 were randomly allocated to the combination therapy group or monotherapy group. The former received hydrotalcite combined with esomeprazole, and the latter received esomeprazole alone, for 8 wk. Twenty-four healthy volunteers were recruited and acted as the healthy control group...
February 21, 2017: World Journal of Gastroenterology: WJG
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