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https://www.readbyqxmd.com/read/28449495/laser-resection-of-pulmonary-nodule-via-uniportal-thoracoscopic-surgery
#1
Calvin S H Ng, Freddie Capili, Ze-Rui Zhao, Peter S Y Yu, Jacky Y K Ho, Rainbow W H Lau
Uniportal video-assisted thoracic surgery (VATS) lung wedge resection usually requires three devices, thoracoscope, lung retracting instrument and an endo-stapler cutter to perform the procedure. With advances in miniaturization of the thoracoscope and lung retracting instruments, a major limitation to operating through a smaller uniportal incision has become the endo-stapler. We describe the surgical technique for uniportal VATS laser lung resection which uses a much narrower laser catheter device to replace the endo-stapler for resection...
March 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28449323/in-vitro-comparison-of-renal-stone-laser-treatment-using-fragmentation-and-popcorn-technique
#2
Paul Klaver, Tjeerd de Boorder, Alex I Rem, Tycho M T W Lock, Herke Jan Noordmans
OBJECTIVE: To study the effectiveness of two laser techniques clinically used to fragment renal stones: fragmenting technique (FT) and popcorn technique (PT). METHODS: Phantom stones were placed in a test tube filled with water, mimicking a renal calyx model. A Holmium:YAG laser was used for fragmentation using both techniques. Four series of experiments were performed with two parameters: the technique (FT or PT) and the number of stones in the test tube (one or four)...
April 27, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28449060/the-influence-of-miniscrew-insertion-torque
#3
Melissa V Nguyen, John Codrington, Lloyd Fletcher, Craig W Dreyer, Wayne J Sampson
Objective: The aim of this in vitro study was to evaluate the progressive development of surface microdamage produced following the insertion of orthodontic miniscrews (OMs) into 1.5 mm thick porcine tibia bone using maximum insertion torque values of 12 Ncm, 18 Ncm, and 24 Ncm. Methods: Aarhus OMs (diameter 1.5 mm; length 6 mm) were inserted into 1.5 mm porcine bone using a torque limiting hand screwdriver set at 12 Ncm, 18 Ncm, and 24 Ncm. A custom rig equipped with a compression load cell was used to record the compression force exerted during manual insertion...
April 24, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28448851/accurate-3d-reconstruction-of-bony-surfaces-using-ultrasonic-synthetic-aperture-techniques-for-robotic-knee-arthroplasty
#4
William Kerr, Philip Rowe, Stephen Gareth Pierce
Robotically guided knee arthroplasty systems generally require an individualized, preoperative 3D model of the knee joint. This is typically measured using Computed Tomography (CT) which provides the required accuracy for preoperative surgical intervention planning. Ultrasound imaging presents an attractive alternative to CT, allowing for reductions in cost and the elimination of doses of ionizing radiation, whilst maintaining the accuracy of the 3D model reconstruction of the joint. Traditional phased array ultrasound imaging methods, however, are susceptible to poor resolution and signal to noise ratios (SNR)...
April 19, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28448727/long-term-outcomes-of-a-large-cohort-of-patients-with-eales-disease
#5
Jyotirmay Biswas, Reesha K R, Bikramjit Pal, Harshal P Gondhale, Ranju Kharel Sitaula
PURPOSE: To analyze the long-term visual outcomes of Eales' patients. METHODS: A retrospective review of Eales' patients diagnosed between 1985 and 1995 with >10 years follow-up done. RESULTS: We included 500 patients (898 eyes) with mean follow-up duration of 15.8 years (10-25 years), and 81% patients had bilateral disease. Patients using oral steroid during acute stage disease had significantly better visual outcome at the final visit [0...
April 27, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28448524/modelling-the-vertical-distribution-of-canopy-fuel-load-using-national-forest-inventory-and-low-density-airbone-laser-scanning-data
#6
Eduardo González-Ferreiro, Stéfano Arellano-Pérez, Fernando Castedo-Dorado, Andrea Hevia, José Antonio Vega, Daniel Vega-Nieva, Juan Gabriel Álvarez-González, Ana Daría Ruiz-González
The fuel complex variables canopy bulk density and canopy base height are often used to predict crown fire initiation and spread. Direct measurement of these variables is impractical, and they are usually estimated indirectly by modelling. Recent advances in predicting crown fire behaviour require accurate estimates of the complete vertical distribution of canopy fuels. The objectives of the present study were to model the vertical profile of available canopy fuel in pine stands by using data from the Spanish national forest inventory plus low-density airborne laser scanning (ALS) metrics...
2017: PloS One
https://www.readbyqxmd.com/read/28448151/methoxysulfinyl-radical-ch3oso-gas-phase-generation-photochemistry-and-oxidation
#7
Qifan Liu, Zhuang Wu, Jian Xu, Yan Lu, Hongmin Li, Xiaoqing Zeng
Methylsulfoxide radicals CH3SOx (x = 1-4) are key reactive sulfur species (RSS) in the atmospheric oxidation of volatile organic sulfur compounds (VOSCs). Through flash vacuum pyrolysis (FVP) of trifluoromethanesulfinic acid methyl ester CF3S(O)OCH3 at 1000 K, the methoxysulfinyl radical CH3OSO has been generated in the gas phase and subsequently characterized in cryogenic N2, Ar, and Ne matrices by IR spectroscopy. Upon 266 nm laser irradiation, CH3OSO efficiently isomerizes to the less stable methylsulfonyl radical CH3SO2 in matrices without noticeable decomposition...
April 27, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28448115/high-temperature-superconductivity-in-boron-doped-q-carbon
#8
Anagh Bhaumik, Ritesh Sachan, Jagdish Narayan
We report high-temperature superconductivity in B-doped amorphous quenched carbon (Q-carbon). This phase is formed after nanosecond laser melting of B-doped amorphous carbon films in a super undercooled state and followed by rapid quenching. Magnetic susceptibility measurements show the characteristics of type-II Bardeen-Cooper-Schrieffer superconductivity with a superconducting transition temperature (Tc) of 36.0±0.5 K for 17.0±1.0 atomic percent boron concentration. This value is significantly higher than the best experimentally reported Tc of 11 K for crystalline B-doped diamond...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448050/single-molecule-analysis-of-laser-localized-psoralen-adducts
#9
Jing Huang, Himabindu Gali, Julia Gichimu, Marina A Bellani, Durga Pokharel, Manikandan Paramasivam, Michael M Seidman
The DNA Damage Response (DDR) has been extensively characterized in studies of double strand breaks (DSBs) induced by laser micro beam irradiation in live cells. The DDR to helix distorting covalent DNA modifications, including interstrand DNA crosslinks (ICLs), is not as well defined. We have studied the DDR stimulated by ICLs, localized by laser photoactivation of immunotagged psoralens, in the nuclei of live cells. In order to address fundamental questions about adduct distribution and replication fork encounters, we combined laser localization with two other technologies...
April 20, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28448046/a-novel-technique-for-raman-analysis-of-highly-radioactive-samples-using-any-standard-micro-raman-spectrometer
#10
Jean-Yves Colle, Mohamed Naji, Mark Sierig, Dario Manara
A novel approach for the Raman measurement of nuclear materials is reported in this paper. It consists of the enclosure of the radioactive sample in a tight capsule that isolates the material from the atmosphere. The capsule can optionally be filled with a chosen gas pressurized up to 20 bars. The micro-Raman measurement is performed through an optical-grade quartz window. This technique permits accurate Raman measurements with no need for the spectrometer to be enclosed in an alpha-tight containment. It therefore allows the use of all options of the Raman spectrometer, like multi-wavelength laser excitation, different polarizations, and single or triple spectrometer modes...
April 12, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28448021/detection-of-ligand-activated-g-protein-coupled-receptor-internalization-by-confocal-microscopy
#11
Jingwen Yang, Yunjun Yan, Xiaowei Xiang, Yuchao Xu, Naiming Zhou, Tianming Wang
Confocal laser scanning microscopy (CLSM) is an optical imaging technique for high-contrast imaging. It is a powerful approach to visualize fluorescent fusion proteins, such as green fluorescent protein (GFP), to determine their expression, localization, and function. The subcellular localization of target proteins is important for identification, characterization, and functional analyses. Internalization is one of the predominant mechanisms controlling G protein-coupled receptor (GPCR) signaling to ensure the appropriate cellular responses to stimuli...
April 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447987/live-cell-imaging-and-3d-analysis-of-angiotensin-receptor-type-1a-trafficking-in-transfected-human-embryonic-kidney-cells-using-confocal-microscopy
#12
Parnika Kadam, Ryan McAllister, Jeffrey S Urbach, Kathryn Sandberg, Susette C Mueller
Live-cell imaging is used to simultaneously capture time-lapse images of angiotensin type 1a receptors (AT1aR) and intracellular compartments in transfected human embryonic kidney-293 (HEK) cells following stimulation with angiotensin II (Ang II). HEK cells are transiently transfected with plasmid DNA containing AT1aR tagged with enhanced green fluorescent protein (EGFP). Lysosomes are identified with a red fluorescent dye. Live-cell images are captured on a laser scanning confocal microscope after Ang II stimulation and analyzed by software in three dimensions (3D, voxels) over time...
March 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447960/an-analytical-reconstruction-model-of-the-spread-out-bragg-peak-using-the-laser-accelerated-proton-beams
#13
Li Tao, Kun Zhu, Jungao Zhu, Xiaohan Xu, Chen Lin, Wenjun Ma, Haiyang Lu, Yanying Zhao, Yuanrong Lu, Jia-Er Chen, Xueqing Yan
With the development of laser technology, laser-driven proton acceleration provides a new way for proton tumor therapy. However, it has not been applied in practice, because of the wide and decreasing energy spectrum of laser-accelerated proton beams. In this paper, we propose an analytical model to reconstruct the spread-out Bragg peak (SOBP) using the laser-accelerated proton beams. Firstly, we present a modified weighting formula for protons of different energies. Secondly, a theoretical model for the reconstruction of SOBPs with laser-accelerated proton beams has been built...
April 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28447888/impact-of-particle-size-and-surface-modification-on-gold-nanoparticle-penetration-into-human-placental-microtissues
#14
Carina Muoth, Mandy Großgarten, Uwe Karst, Jaime Ruiz, Didier Astruc, Sergio Moya, Liliane Diener, Kathrin Grieder, Adrian Wichser, Wolfram Jochum, Peter Wick, Tina Buerki-Thurnherr
AIM: Nanoparticle-based drug carriers hold great promise for the development of targeted therapies in pregnancy with reduced off-target effects. Here, we performed a mechanistic in vitro study on placental localization and penetration of gold nanoparticles (AuNPs) in dependence of particle size and surface modification. MATERIALS & METHODS: AuNP uptake and penetration in human placental coculture microtissues was assessed by inductively coupled plasma-mass spectrometry, transmission electron microscopy and laser ablation-inductively coupled plasma-mass spectrometry...
April 27, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28447856/evaluation-of-the-nutritional-changes-caused-by-huanglongbing-hlb-to-citrus-plants-using-laser-induced-breakdown-spectroscopy
#15
Anielle Coelho Ranulfi, Renan Arnon Romano, Aida Bebeachibuli Magalhães, Ednaldo José Ferreira, Paulino Ribeiro Villas-Boas, Débora Marcondes Bastos Pereira Milori
Huanglongbing (HLB) is the most recent and destructive bacterial disease of citrus and has no cure yet. A promising alternative to conventional methods is to use laser-induced breakdown spectroscopy (LIBS), a multi-elemental analytical technique, to identify the nutritional changes provoked by the disease to the citrus leaves and associate the mineral composition profile with its health status. The leaves were collected from adult citrus trees and identified by visual inspection as healthy, HLB-symptomatic, and HLB-asymptomatic...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28447695/phase-transformation-of-tio2-nanoparticles-by-femtosecond-laser-ablation-in-aqueous-solutions-and-deposition-on-conductive-substrates
#16
Paola Russo, Robert Liang, Rui Xiu He, Y Norman Zhou
Titanium dioxide (TiO2) is a wide bandgap semiconductor that is chemically stable, non-toxic, and economical compared to other semiconductors and has been implemented in a wide range of applications such as photocatalysis, photovoltaics, and memristors. In this work we studied the femtosecond laser ablation of titanium dioxide powders (P25) dispersed either in water or deposited onto a fluoride-doped tin oxide (FTO) substrate. The process was used as a route to induce the phase-transformation of TiO2 nanoparticles which was governed by laser parameters such as ablation time and power...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447616/high-order-harmonics-measured-by-the-photon-statistics-of-the-infrared-driving-field-exiting-the-atomic-medium
#17
N Tsatrafyllis, I K Kominis, I A Gonoskov, P Tzallas
High-order harmonics in the extreme-ultraviolet spectral range, resulting from the strong-field laser-atom interaction, have been used in a broad range of fascinating applications in all states of matter. In the majority of these studies the harmonic generation process is described using semi-classical theories which treat the electromagnetic field of the driving laser pulse classically without taking into account its quantum nature. In addition, for the measurement of the generated harmonics, all the experiments require diagnostics in the extreme-ultraviolet spectral region...
April 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28447612/distinct-molecular-cues-ensure-a-robust-microtubule-dependent-nuclear-positioning-in-the-drosophila-oocyte
#18
Nicolas Tissot, Jean-Antoine Lepesant, Fred Bernard, Kevin Legent, Floris Bosveld, Charlotte Martin, Orestis Faklaris, Yohanns Bellaïche, Maïté Coppey, Antoine Guichet
Controlling nucleus localization is crucial for a variety of cellular functions. In the Drosophila oocyte, nuclear asymmetric positioning is essential for the reorganization of the microtubule (MT) network that controls the polarized transport of axis determinants. A combination of quantitative three-dimensional live imaging and laser ablation-mediated force analysis reveal that nuclear positioning is ensured with an unexpected level of robustness. We show that the nucleus is pushed to the oocyte antero-dorsal cortex by MTs and that its migration can proceed through distinct tracks...
April 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28447488/observation-of-the-162-dy-164-dy-isotope-shift-for-the-0-%C3%A2-16%C3%A2-717-79%C3%A2-cm-1-optical-transition
#19
Luiz Felipe Nardin Barreta, Alessandro Rogério Victor, Patrícia Bueno, Jhonatha Ricardo Dos Santos, Carlos Alberto Barbosa da Silveira, José Wilson Neri, Jonas Jakutis Neto, Maria Esther Sbampato, Marcelo Geraldo Destro
In this work, we report a newly observed isotope shift between (162)Dy and (164)Dy isotopes for the 0 → 16 717.79 cm(-1) (598.003 nm) optical transition. We compared the newly observed results against two other lines (597.452 nm and 598.859 nm), which we measured in this work, and were already reported in the literature. The newly observed 162-164 Dy isotope shift, shows at least a 20% larger isotope shift than the isotope shifts for the other two lines investigated. The larger 162-164 isotope shift observed for the 598...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28447482/quantitative-potassium-measurements-with-laser-induced-breakdown-spectroscopy-using-low-energy-lasers-application-to-in-situ-k-ar-geochronology-for-planetary-exploration
#20
Yuichiro Cho, Misa Horiuchi, Kazuo Shibasaki, Shingo Kameda, Seiji Sugita
In situ radiogenic isotope measurements to obtain the absolute age of geologic events on planets are of great scientific value. In particular, K-Ar isochrons are useful because of their relatively high technical readiness and high accuracy. Because this isochron method involves spot-by-spot K measurements using laser-induced breakdown spectroscopy (LIBS) and simultaneous Ar measurements with mass spectrometry, LIBS measurements are conducted under a high vacuum condition in which emission intensity decreases significantly...
January 1, 2017: Applied Spectroscopy
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