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https://www.readbyqxmd.com/read/28927210/navigation-and-image-injection-for-control-of-bone-removal-and-osteotomy-planes-in-spine-surgery
#1
Michael Kosterhon, Angelika Gutenberg, Sven Rainer Kantelhardt, Elefterios Archavlis, Alf Giese
BACKGROUND AND IMPORTANCE: In contrast to cranial interventions, neuronavigation in spinal surgery is used in few applications, not tapping into its full technological potential. We have developed a method to preoperatively create virtual resection planes and volumes for spinal osteotomies and export 3-D operation plans to a navigation system controlling intraoperative visualization using a surgical microscope's head-up display. The method was developed using a Sawbone ® model of the lumbar spine, demonstrating feasibility with high precision...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28927208/observation-of-neointimal-coverage-around-the-aneurysm-neck-after-stent-assisted-coil-embolization-by-optical-frequency-domain-imaging-technical-case-report
#2
Rie Yako, Hiroyuki Matsumoto, Osamu Masuo, Naoyuki Nakao
BACKGROUND AND IMPORTANCE: Stent-assisted coil embolization has been established as a treatment option for wide-necked or complex aneurysms. However, concerns have been raised about the incidence of thromboembolic complications, which is higher for coil embolization without stent assistance. Long-term antiplatelet therapy is necessary to prevent acute or delayed ischemic events potentially associated with incomplete stent apposition after treatment with stent-assisted coil embolization...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28927166/experimental-evaluation-of-respirable-dust-and-crystalline-silica-controls-during-simulated-performance-of-stone-countertop-fabrication-tasks-with-powered-hand-tools
#3
David L Johnson, Margaret L Phillips, Chaolong Qi, Anthony T Van, Danielle A Hawley
Objectives: Workers who fabricate stone countertops using hand tools are at risk of silicosis from overexposure to respirable crystalline silica. This study explored the efficacy of simple engineering controls that can be used for dust suppression during use of hand tools by stone countertop fabricators. Methods: Controlled experiments were conducted to measure whether wet methods and on-tool local exhaust ventilation (LEV) reduced respirable dust (RD) exposures during use of various powered hand tools on quartz-rich engineered stone...
July 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28926888/-accelerated-transepithelial-corneal-collagen-cross-linking-for-progressive-keratoconus-with-a-thin-cornea-one-year-results
#4
Z R Lin, H P Wu, S R Luo, Z S Liu, N Dong, X M Shang, Z W Xie, L Yan, X Fang
Objective: To evaluate the clinical results of keratoconic eyes with a thin cornea treated with accelerated transepithelial corneal collagen cross-linking (A-TE-CXL) within 1 year. Methods: Nineteen eyes of 19 patients with progressive keratoconus with a minimum corneal thickness from 380 μm to 420 μm (including the epithelium) were included in this prospective, nonrandomized clinical study and treated with A-TE-CXL. Scoring of pain and foreign body sensation, slit lamp examination, uncorrected visual acuity, best corrected distance visual acuity, corneal topography, anterior segment optical coherence tomography, in vivo corneal confocal microscopy and endothelial cell count were assessed before surgery and at 1, 3, 6 and 12 months postoperatively...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926886/-keratectomy-combined-with-intrastromal-injection-of-voriconazole-in-treating-fungal-keratitis
#5
S X Li, J Biang, X Li, L T Zhang, W Y Shi
Objective: To investigate the treatment effect of keratectomy combined with intrastromal injection of voriconazole on fungal keratitis. Methods: Retrospective study. Ninety-eight fungal keratitis patients (98 eyes) were treated by keratectomy combined with intrastromal injection of voriconazole in Shandong Eye Hospital from January 2013 to May 2015. The corneal ulcers were mostly located in the paracentral or peripheral cornea, which incompletely blocked the pupil area. Slit lamp and anterior segment optical coherence tomography (AS-OCT) were used for lesion detection...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926884/-a-study-on-the-diagnostic-value-of-tear-film-objective-scatter-index-in-dry-eye
#6
Y D Su, Q F Liang, N L Wang, Labbè Antoine
Objective: To study the sensitivity and specificity of tear film objective scatter index to the diagnosis dry eye disease (DED). Methods: A prospective case-controlled study. Fifty-three patients with DED and 32 healthy age- and sex-matched control subjects were included from July to October 2016. All subjects underwent the examinations sequentially as follows: evaluation of ocular surface disease symptoms using the Ocular Surface Disease Index, optical quality detection, lipid layer thickness, tear film breakup time and SchirmerⅠtest...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926715/optical-forging-of-graphene-into-three-dimensional-shapes
#7
Andreas Johansson, Pasi Myllyperkiö, Pekka Koskinen, Jukka Aumanen, Juha Tapio Koivistoinen, Hung-Chieh Tsai, Chia-Hao Chen, Lo-Yueh Chang, Vesa-Matti Hiltunen, Jyrki Manninen, Wei-Yen Woon, Mika Pettersson
Atomically thin materials, such as graphene, are the ultimate building blocks for nanoscale devices. But although their synthesis and handling today are routine, all efforts thus far have been restricted to flat natural geometries, since the means to control their three-dimensional (3D) morphology has remained elusive. Here we show that, just as a blacksmith uses a hammer to forge a metal sheet into 3D shapes, a pulsed laser beam can forge graphene sheet into controlled 3D shapes in the nanoscale. The forging mechanism is based on laser-induced local expansion of graphene, as confirmed by computer simulations using thin sheet elasticity theory...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926707/medieval-gilding-technology-of-historical-metal-threads-revealed-by-electron-optical-and-micro-raman-spectroscopic-study-of-focused-ion-beam-milled-cross-sections
#8
Tamás Gábor Weiszburg, Katalin Gherdán, Kitti Ratter, Norbert Zajzon, Zsolt Bendő, György Z Radnoczi, Ágnes Takács, Tamás Váczi, Gábor Varga, György Szakmány
Although gilt silver threads were widely used for decorating historical textiles, their manufacturing techniques have been elusive for centuries. Contemporary written sources give only limited, sometimes ambiguous information, and detailed cross-sectional study of the microscale soft noble metal objects has been hindered by sample preparation. In this work, to give a thorough characterization of historical gilt silver threads, nano- and microscale textural, chemical and structural data on cross sections, prepared by focused ion beam milling, were collected, using various electron-optical methods (high-resolution scanning electron microscopy (SEM), wavelength-dispersive electron probe microanalysis (EPMA), electron back-scattered diffraction (EBSD) combined with energy-dispersive electron probe microanalysis (EDX), transmission electron microscopy (TEM) combined with EDX, and micro-Raman spectroscopy...
September 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28926685/nir-absorbing-metal-free-organic-porphyrin-and-phthalocyanine-dyes-for-panchromatic-dscs
#9
Phillip Brogdon, Hammad Cheema, Jared Heath Delcamp
Dye-sensitized solar cells (DSCs) are a promising source of renewable energy. However, power conversion efficiency (PCE) of devices has been limited largely by the difficulty of producing electricity using photons from the near-infrared (NIR) spectral region. Metal-free organic sensitizers frequently employ strong electron donating or withdrawing moieties to tune the optical band gap to allow the absorption of lower energy wavelengths in charge transfer systems while porphyrins and phthalocyanines use substituents to shift the Soret and Q bands toward lower energy absorption...
September 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28926646/vascular-hypoperfusion-in-acute-optic-neuritis-is-a-potentially-new-neurovascular-model-for-demyelinating-diseases
#10
Ta-Ching Chen, Chao-Yuan Yeh, Chao-Wen Lin, Chung-May Yang, Chang-Hao Yang, I-Hung Lin, Pao-Yang Chen, Jung-Yu Cheng, Fung-Rong Hu
PURPOSE: Optic neuritis is highly correlated with multiple sclerosis and is a major cause of acute visual loss and long-term neuronal degeneration. Primary cerebral hypoperfusion has been reported in brain demyelinating diseases. This study investigated whether peripapillary perfusion is changed in patients with acute optic neuritis (AON). METHODS: This three-year cohort study was conducted from September 1 2012, to August 31, 2015. Two hundred and forty-one patients with non-glaucomatous acute optic neuropathy were screened, and 42 non-highly myopic patients who had suffered their first episode of unilaterally idiopathic AON were studied...
2017: PloS One
https://www.readbyqxmd.com/read/28926419/peduncular-hallucinosis-and-autonomic-dysfunction-in-anti-aquaporin-4-antibody-syndrome
#11
Renee Berry, Peter K Panegyres
Neuromyelitis optica is a rare, severe inflammatory demyelinating disease of the central nervous system, previously described as affecting only the optic nerve and spinal cord. Since the discovery of a highly specific autoantibody, anti-aquaporin-4, lesions are now recognized outside these regions. We report a man with severe, debilitating symptoms resulting from a symptomatic lesion within the diencephalon, manifesting with abnormal circadian rhythms, autonomic dysfunction, behavioral disturbance, and complex visual hallucinations...
September 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28926354/neointimal-coverage-of-jailed-side-branches-in-coronary-bifurcation-lesions-an-optical-coherence-tomography-analysis
#12
Teruyoshi Kume, Ryotaro Yamada, Koyama Terumasa, Tomoko Tamada, Koichiro Imai, Kenzo Fukuhara, Yutaka Goryo, Ai Kawamura, Okamoto Hiroshi, Yoji Neishi, Shiro Uemura
OBJECTIVES: The jailed strut at the side-branch (SB) orifice may be a cause of delayed neointimal coverage and SB flow disturbance after single stenting to bifurcation. The aim of this study was to characterize the exact relationship between the jailed strut pattern at the SB orifice immediately after stent implantation and neointimal coverage of the jailed SB orifice in the chronic phase. PATIENTS AND METHODS: A total of 29 bifurcation (left anterior descending coronary artery and diagonal branch) lesions treated by optical coherence tomography-guide single-stent implantation and followed at 18 months after a percutaneous coronary intervention were included in this study...
September 18, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28926278/planar-optical-nano-antennas-resolve-cholesterol-dependent-nanoscale-heterogeneities-in-the-plasma-membrane-of-living-cells
#13
Raju Regmi, Pamina Martina Winkler, Valentin Flauraud, Kyra Borgman, Carlo Manzo, Juergen Brugger, Herve Rigneault, Jerome Wenger, Maria F Garcia-Parajo
Optical nano-antennas can efficiently confine light into nanoscopic hotspots enabling single-molecule detection sensitivity at biological relevant conditions. This innovative approach to breach the diffraction limit offers a versatile platform to investigate the dynamics of individual biomolecules in living cell membranes and their partitioning into cholesterol-dependent lipid nanodomains. Here, we present optical nano-antenna arrays with accessible surface hotspots to study the characteristic diffusion dynamics of phosphoethanolamine (PE) and sphingomyelin (SM) in the plasma membrane of living cells at the nanoscale...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926276/polypyrrole-coated-perfluorocarbon-nanoemulsions-as-a-sono-photoacoustic-contrast-agent
#14
David Shicheng Li, Soon Joon Yoon, Ivan Pelivanov, M Frenz, Matthew O'Donnell, Lilo D Pozzo
A new contrast agent for combined photoacoustic and ultrasound imaging is presented. It has a liquid perfluorocarbon (PFC) core of about 250 nm diameter coated by a 30 nm thin polypyrrole (PPy) doped polymer shell emulsion which represents a broadband absorber covering the visible and near-infrared ranges (peak optical extinction at 1050 nm). When exposed to a sufficiently high intensity optical or acoustic pulse, the droplets vaporize to form microbubbles providing a strong increase in imaging sensitivity and specificity...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926275/mapping-photoemission-and-hot-electron-emission-from-plasmonic-nanoantennas
#15
Richard Hobbs, William Putnam, Arya Fallahi, Yujia Yang, Franz Kaertner, Karl K Berggren
Understanding plasmon-mediated electron emission and energy transfer on the nanometer length scale is critical to controlling light-matter interactions at nanoscale dimensions. In a high-resolution lithographic material, electron emission and energy transfer lead to chemical transformations. In this work, we employ such chemical transformations in two different high-resolution electron-beam lithography resists, poly(methyl methacrylate) (PMMA) and hydrogen silsesquioxane (HSQ), to map local electron emission and energy transfer with nanometer resolution from plasmonic nanoantennas excited by femtosecond laser pulses...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926272/collective-lasing-behavior-of-monolithic-gan-ingan-core-shell-nanorod-lattice-under-room-temperature
#16
Chia-Yen Huang, Jing-Jie Lin, Tsu-Chi Chang, Che-Yu Liu, Tzu-Ying Tai, Kuo-Bin Hong, Tien-Chang Lu, Hao-Chung Kuo
We demonstrated a monolithic GaN-InGaN core-shell nanorod lattice lasing under room temperature. The threshold pumping density was as low as 140 kW/cm2 with a quality factor as high as 1940. The narrow mode spacing between lasing peaks suggested a strong coupling between adjacent whisper gallery modes (WGM), which was confirmed with the far-field patterns. Excitation area dependent photoluminescence revealed that the long-wavelength lasing modes dominated the collective lasing behavior under a large excitation area...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926271/circularly-polarized-luminescence-from-chiral-spiro-molecules-synthesis-and-optical-properties-of-10-10-spirobi-indeno-1-2-b-1-benzothiophene-derivatives
#17
Ko Takase, Keiichi Noguchi, Koji Nakano
Chiral spiro polycyclic aromatic compounds with thiophene and/or thiophene S,S-dioxide units were synthesized as a new family of circularly polarized luminescence (CPL) materials. Oxidation of the thiophene unit to its S,S-dioxide provided significant changes in photophysical properties such as much higher fluorescence quantum yield and positive solvatochromism in photoluminescence spectra. Density functional theory calculations qualitatively demonstrated the observed absorption properties. The prepared chiral spiro compounds exhibit intense CPL signals with a relatively large dissymmetry factor for small organic molecules...
September 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28926263/copper-sulfide-perfluorocarbon-nanodroplets-as-clinically-relevant-photoacoustic-ultrasound-imaging-agents
#18
Daniela Y Santiesteban, Diego S Dumani, Daniel Profili, Stanislav Y Emelianov
We have developed laser-activated perfluorocarbon nanodroplets containing copper sulfide nanoparticles (CuS NPs) for contrast-enhanced ultrasound and photoacoustic imaging. As potential clinical contrast agents, CuS NPs have favorable properties including biocompatibility, biodegradability and enhance contrast in photoacoustic images at clinically relevant depths. However, CuS NPs are not efficient optical absorbers when compared to plasmonic nanoparticles and therefore, contrast enhancement with CuS NPs is limited, requiring high concentrations to generate images with sufficient signal-to-noise ratio...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926252/absolute-enantiomeric-excess-determination-of-carbon-nanotubes-ensemble-by-symmetry-breaking-using-optical-titration-method
#19
Jinsook Sim, Somin Kim, Myungsu Jang, Minsuk Park, Hyunkyu Oh, Sang-Yong Ju
Symmetry breaking of single-walled carbon nanotubes (SWNTs) has profound effects on their optoelectronic properties which are essential for fundamental study and applications. Here, we show that isomeric SWNT which exhibit identical photoluminescence (PL) undergo symmetry breaking by flavin mononucleotide (FMN) and exhibits dual PLs and different binding affinity (Ka). Increasing FMN concentration leads to systematic PL shifts of SWNT according to structural modality and handedness due to symmetry breaking...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28926248/short-wave-near-infrared-linear-dichroism-of-two-dimensional-germanium-selenide
#20
Xiaoting Wang, Yongtao Li, Le Huang, Xiang-Wei Jiang, Lang Jiang, Huanli Dong, Zhongming Wei, Jingbo Li, Wenping Hu
Polarized detection has been brought into operation for optics applications in visible band. Although an advanced requirement in short-wave near-infrared (SW-NIR) (700-1100 nm) is proposed, the approaching of this target remains under way. Theoretically, IV-VI chalcogenides two-dimensional (2D) structures, e.g., 2D germanium selenide (GeSe), possess anisotropic layered orthorhombic structure, narrow 1.1-1.2eV bandgap and potentially meet the demand. Here we report the unusual angle dependences of Raman spectra on controllably synthesized high-quality 2D GeSe crystals...
September 19, 2017: Journal of the American Chemical Society
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