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https://www.readbyqxmd.com/read/28448725/endogenous-cryptococcal-endophthalmitis-in-immunocompetent-host-case-report-and-review-of-multimodal-imaging-findings-and-treatment
#1
Atchara Amphornphruet, Sukhum Silpa-Archa, Janine M Preble, C Stephen Foster
PURPOSE: To describe a case of bilateral endogenous cryptococcal endophthalmitis in an immunocompetent host and to review adjunctive ophthalmic imaging patterns and treatment. METHODS: A retrospective case report. RESULTS: A 45-year-old female patient with two distinct presentations of endogenous cryptococcal endophthalmitis in each eye presented initially with progressive blurred vision in the left eye, beginning more than 10 years after a craniotomy with ventriculoperitoneal shunt...
April 27, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28447287/topography-and-correlation-of-radial-peripapillary-capillary-density-network-with-retinal-nerve-fibre-layer-thickness
#2
Tarannum Mansoori, Jayanthi Sivaswamy, Jahnavi Sai Gamalapati, Nagalla Balakrishna
PURPOSE: To analyse the expansion of radial peripapillary capillary (RPC) network with optical coherence tomography angiography (OCT-A) in normal human eyes and correlate RPC density with retinal nerve fibre layer thickness (RNFLT) at various distances from the optic nerve head (ONH) edge. METHODS: Fifty eyes of 50 healthy subjects underwent imaging with RTVue XR-100 Avanti OCT. OCT-A scans of Angio disc (6 × 6 mm) and Angio retina (8 × 8 mm) were combined to create a wide-field montage image of the RPC network...
April 26, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28445168/enhanced-photoluminescence-of-corrugated-al2o3-film-assisted-by-colloidal-cdse-quantum-dots
#3
Zhongchen Bai, Licai Hao, Zhengping Zhang, Zhaoling Huang, Shuijie Qin
We present the enhanced photoluminescence (PL) of a corrugated Al2O3 film enabled by colloidal CdSe quantum dots. The colloidal CdSe quantum dots are fabricated directly on a corrugated Al2O3 substrate using an electrochemical deposition (ECD) method in a microfluidic system. The photoluminescence is excited by using a 150 nm diameter ultraviolet laser spot of a scanning near-field optical microscope. Owing to the electron transfer from the conduction band of the CdSe quantum dots to that of Al2O3, the enhanced photoluminescence effect is observed, which results from the increase in the recombination rate of electrons and holes on the Al2O3 surface and the reduction in the fluorescence of the CdSe quantum dots...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28444596/response-surface-design-for-accumulation-of-selenium-by-different-lactic-acid-bacteria
#4
Jingpeng Yang, Yao Li, Li Zhang, Mingtao Fan, Xinyuan Wei
The accumulation of selenium (Se) by Lactobacillus delbrueckii ssp. bulgaricus (Lb) and Streptococcus thermophilus (St) at the different cultivation conditions, including initial pH, inoculum dose (%), and temperature (°C), was investigated in this work. Se enrichment efficiency was optimized using the Design-Expert software for response surface methodology on a basis of single-factor experiment. The antioxidant activities of Se-enriched Lactic acid bacteria (LAB) were also investigated. The qualitative analysis of Se-enriched LAB was performed by FT-IR spectra...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28439521/dynamic-electronic-collimation-method-for-3-d-catheter-tracking-on-a-scanning-beam-digital-x-ray-system
#5
David A P Dunkerley, Jordan M Slagowski, Tobias Funk, Michael A Speidel
Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3-D catheter tracking. This work proposes a method of dose-reduced 3-D catheter tracking using dynamic electronic collimation (DEC) of the SBDX scanning x-ray tube. This is achieved through the selective deactivation of focal spot positions not needed for the catheter tracking task. The technique was retrospectively evaluated with SBDX detector data recorded during a phantom study. DEC imaging of a catheter tip at isocenter required 340 active focal spots per frame versus 4473 spots in full field-of-view (FOV) mode...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28437947/hard-x-ray-scanning-imaging-achieved-with-bonded-multilayer-laue-lenses
#6
Xiaojing Huang, Weihe Xu, Evgeny Nazaretski, Nathalie Bouet, Juan Zhou, Yong S Chu, Hanfei Yan
We report scanning hard x-ray imaging with a monolithic focusing optic consisting of two multilayer Laue lenses (MLLs) bonded together. With optics pre-characterization and accurate control of the bonding process, we show that a common focal plane for both MLLs can be realized at 9.317 keV. Using bonded MLLs, we obtained a scanning transmission image of a star test pattern with a resolution of 50 × 50 nm<sup>2</sup>. By applying a ptychography algorithm, we obtained a probe size of 17 × 38 nm<sup>2</sup> and an object image with a resolution of 13 × 13 nm<sup>2</sup>...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437937/use-of-kramers-kronig-relation-in-phase-retrieval-calculation-in-x-ray-spectro-ptychography
#7
Makoto Hirose, Kei Shimomura, Nicolas Burdet, Yukio Takahashi
Coherent diffraction imaging (CDI) is a method for reconstructing the complex-valued image of an object from diffraction intensities by using iterative phasing methods. X-ray ptychography is a scanning type of CDI using X-rays, allowing us to visualize the complex transmission function of an extended specimen. We here propose the use of the Kramers-Kronig relation (KKR) as an additional constraint in phase retrieval algorithms for multiple-energy X-ray ptychography using the absorption edge of a specific element...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437066/electric-field-driven-direct-desulfurization
#8
Bogdana Borca, Tomasz Michnowicz, Rémi Pétuya, Marcel Pristl, Verena Schendel, Ivan Pentegov, Ulrike Kraft, Hagen Klauk, Peter Wahl, Rico Gutzler, Andrés Arnau, Uta Schlickum, Klaus Kern
The ability to elucidate the elementary steps of a chemical reaction at the atomic scale is important for the detailed understanding of the processes involved which is key to uncover avenues for improved reaction paths. Here, we track the chemical pathway of an irreversible direct desulfurization reaction of tetracenothiophene adsorbed on the Cu(111) closed-packed surface at the submolecular level. Using the precise control of the tip position in a Scanning Tunneling Microscope and the electric field applied across the tunnel junction, the two carbon-sulfur bonds of a thiophene unit are successively cleaved...
April 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28435179/real-time-measurement-of-size-resolved-elemental-composition-ratio-for-flame-synthesized-composite-nanoparticle-aggregates-using-a-tandem-smps-icp-oes
#9
Nathan Reed, Jiaxi Fang, Sanmathi Chavalmane, Pratim Biswas
Composite nanoparticles find application in catalysis, drug delivery, and energy storage and require increasingly fine control of their physical properties and composition. While composite nanoparticles have been widely synthesized and characterized, little work has systematically correlated the initial concentration of precursors and the final composition of flame synthesized composite nanoparticles. This relationship is explored in a diffusion flame aerosol reactor by coupling a scanning mobility particle sizer (SMPS) with an inductively coupled plasma optical emission spectrometer (ICP-OES)...
2017: Aerosol Science and Technology: the Journal of the American Association for Aerosol Research
https://www.readbyqxmd.com/read/28434783/electron-ptychographic-phase-imaging-of-light-elements-in-crystalline-materials-using-wigner-distribution-deconvolution
#10
Hao Yang, Ian MacLaren, Lewys Jones, Gerardo T Martinez, Martin Simson, Martin Huth, Henning Ryll, Heike Soltau, Ryusuke Sagawa, Yukihito Kondo, Colin Ophus, Peter Ercius, Lei Jin, András Kovács, Peter D Nellist
Recent development in fast pixelated detector technology has allowed a two dimensional diffraction pattern to be recorded at every probe position of a two dimensional raster scan in a scanning transmission electron microscope (STEM), forming an information-rich four dimensional (4D) dataset. Electron ptychography has been shown to enable efficient coherent phase imaging of weakly scattering objects from a 4D dataset recorded using a focused electron probe, which is optimised for simultaneous incoherent Z-contrast imaging and spectroscopy in STEM...
April 1, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28426376/evaluation-of-different-laser-supported-surgical-protocols-for-the-treatment-of-oral-leukoplakia-a-long-term-follow-up
#11
Samir Nammour, Toni Zeinoun, Amaury Namour, Alain Vanheusden, Paolo Vescovi
PURPOSE: The aim of this study was to evaluate the long-term success rate of oral leukoplakia treatments by using different laser-supported surgical protocols. PATIENTS AND METHODS: Overall, 2347 diagnosed homogeneous oral leukoplakias were treated with CO2 laser and were included in this study. Different surgical protocols (P) were used: P1 (SV = superficial scanning) was a complete superficial vaporization of the leukoplakia by a scanning mode in two passages respecting an overlapping...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28421602/the-qualitative-f-ratio-method-applied-to-electron-channelling-induced-x-ray-imaging-with-an-annular-silicon-drift-detector-in-a-scanning-electron-microscope-in-the-transmission-mode
#12
Nicolas Brodusch, Raynald Gauvin
Electron channelling is known to affect the x-ray production when an accelerated electron beam is applied to a crystalline material and is highly dependent on the local crystal orientation. This effect, unless very long counting time are used, is barely noticeable on x-ray energy spectra recorded with conventional silicon drift detectors (SDD) located at a small elevation angle. However, the very high count rates provided by the new commercially available annular SDDs permit now to observe this effect routinely and may, in some circumstances, hide the true elemental x-ray variations due to the local true specimen composition...
April 18, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28420831/enamel-microcracks-in-terms-of-orthodontic-treatment-a-novel-method-for-their-detection-and-evaluation
#13
Irma Dumbryte, Laura Linkeviciene, Tomas Linkevicius, Mangirdas Malinauskas
The study aimed at introducing current available techniques for enamel microcracks (EMCs) detection, and presenting a method for direct quantitative analysis of an individual EMC. Measurements of the detailed EMCs characteristics (location, length, and width) were taken from the reconstructed images of the buccal tooth surface (teeth extracted from two age groups of patients) employing a scanning electron microscopy (SEM) and our derived formulas before and after ceramic brackets removal. Measured parameters of EMCs for younger age group were 2...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28417899/synergistic-interaction-between-pseudocapacitive-fe3o4-nanoparticles-and-highly-porous-silicon-carbide-for-high-performance-electrodes-as-electrochemical-supercapacitors
#14
Myeongjin Kim, Jooheon Kim
Composites of micro- and mesoporous SiC flakes (SiCF) and ferroferric oxide (Fe3O4), SiCF/Fe3O4, were prepared via the chemical deposition of Fe3O4 on SiCF by the chemical reduction of an Fe precursor. The SiCF/Fe3O4 electrodes were fabricated at different Fe3O4 feeding ratios to determine the optimal Fe3O4 content that can maintain a high total surface area of SiCF/Fe3O4 composites as well as cause a vigorous redox reaction, thereby maximizing the synergistic effect between the electric double-layer capacitive effects of SiCF and the pseudo-capacitive effects of Fe3O4...
May 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28412797/-correlation-between-axial-length-and-corneal-curvature-and-spherical-aberration
#15
X J Wang, Y Z Bao
Objective: To discuss the correlation between axial length and corneal curvature and corneal spherical aberration in a group of cataract patients with axial length greater than 24 mm. Methods: Retrospective case series. This study comprised 117 (234 eyes) age-related cataract patients. There were 51 men (43.59%) and 66 women (56.41%) with mean age of (69.0±8.7) years (range from 52.0 to 85.0 years). The average axial length was 27.6±1.8 (range from 24.2 to 31.9 mm). We devided them into four groups according to the axial length...
April 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28411813/voltammetric-determination-of-trace-amounts-of-diacetyl-at-a-mercury-meniscus-modified-silver-solid-amalgam-electrode-following-gas-diffusion-microextraction
#16
Rui M Ramos, Luís M Gonçalves, Vlastimil Vyskočil, José A Rodrigues
A new approach was developed for the determination of trace amounts of diacetyl in food products using gas-diffusion microextraction (GDME) and subsequent detection by differential pulse voltammetry (DPV) at a mercury meniscus modified silver solid amalgam electrode (m-AgSAE). Diacetyl is a vicinal diketone responsible for the buttery aroma in many fermented foods and beverages. Its determination is important not only for evaluation of the final product quality (note of mention: health related concerns were associated with continuous diacetyl exposure) but also to monitor fermentation...
July 1, 2017: Talanta
https://www.readbyqxmd.com/read/28409794/high-speed-stimulated-hyperspectral-raman-imaging-using-rapid-acousto-optic-delay-lines
#17
Mohammed S Alshaykh, Chien-Sheng Liao, Oscar E Sandoval, Gregory Gitzinger, Nicolas Forget, Daniel E Leaird, Ji-Xin Cheng, Andrew M Weiner
Stimulated Raman scattering (SRS) is a powerful, label-free imaging technique that holds significant potential for medical imaging. To allow chemical specificity and minimize spectral distortion in the imaging of live species, a high-speed multiplex SRS imaging platform is needed. By combining a spectral focusing excitation technique with a rapid acousto-optic delay line, we demonstrate a hyperspectral SRS imaging platform capable of measuring a 3-dB spectral window of ∼200  cm<sup>-1</sup> within 12...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28409640/polymer-pen-chemical-lift-off-lithography
#18
Xiaobin Xu, Qing Yang, Kevin M Cheung, Chuanzhen Zhao, Natcha Wattanatorn, Jason N Belling, John M Abendroth, Liane S Slaughter, Chad A Mirkin, Anne M Andrews, Paul S Weiss
We designed and fabricated large arrays of polymer pens having sub-20 nm tips to perform chemical lift-off lithography (CLL). As such, we developed a hybrid patterning strategy called polymer-pen chemical lift-off lithography (PPCLL). We demonstrated PPCLL patterning using pyramidal and v-shaped polymer-pen arrays. Associated simulations revealed a nanometer-scale quadratic relationship between contact line widths of the polymer pens and two other variables: polymer-pen base line widths and vertical compression distances...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28406364/fume-emissions-from-a-low-cost-3-d-printer-with-various-filaments
#19
Evan L Floyd, Jun Wang, James L Regens
3-D printing is an additive manufacturing process involving the injection of melted thermoplastic polymers, which are then laid down in layers to achieve a pre-designed shape. The heated deposition process raises concerns of potential aerosol and volatile organic compounds (VOC) emission and exposure. The decreasing cost of desktop 3-D printers has made the use of 3-D printers more acceptable in non-industrial workplaces lacking sufficient ventilation. Meanwhile, little is known about the characteristics of 3-D printing fume emission...
April 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28399222/morphology-of-the-antenna-of-hermetia-illucens-diptera-stratiomyidae-an-ultrastructural-investigation
#20
M Pezzi, M Leis, M Chicca, P Falabella, R Salvia, A Scala, D Whitmore
The black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae), is a relevant species in waste and pest management, but is also of forensic and medical importance. A scanning electron microscopy (SEM) investigation of the antennae of both sexes of H. illucens is presented here for the first time. The antenna is composed of three regions: the scape, the pedicel, and the flagellum. The first two regions are single segments, whereas the third region, the longest one, is composed of eight flagellomeres...
March 13, 2017: Journal of Medical Entomology
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